Merge branch 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

* 'tty-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (79 commits)
  TTY: serial_core: Fix crash if DCD drop during suspend
  tty/serial: atmel_serial: bootconsole removed from auto-enumerates
  Revert "TTY: call tty_driver_lookup_tty unconditionally"
  tty/serial: atmel_serial: add device tree support
  tty/serial: atmel_serial: auto-enumerate ports
  tty/serial: atmel_serial: whitespace and braces modifications
  tty/serial: atmel_serial: change platform_data variable name
  tty/serial: RS485 bindings for device tree
  TTY: call tty_driver_lookup_tty unconditionally
  TTY: pty, release tty in all ptmx_open fail paths
  TTY: make tty_add_file non-failing
  TTY: drop driver reference in tty_open fail path
  8250_pci: Fix kernel panic when pch_uart is disabled
  h8300: drivers/serial/Kconfig was moved
  parport_pc: release IO region properly if unsupported ITE887x card is found
  tty: Support compat_ioctl get/set termios_locked
  hvc_console: display printk messages on console.
  TTY: snyclinkmp: forever loop in tx_load_dma_buffer()
  tty/n_gsm: avoid fifo overflow in gsm_dlci_data_output
  tty/n_gsm: fix a bug in gsm_dlci_data_output (adaption = 2 case)
  ...

Fix up Conflicts in:
 - drivers/tty/serial/8250_pci.c
	Trivial conflict with removed duplicate device ID
 - drivers/tty/serial/atmel_serial.c
	Annoying silly conflict between "specify the port num via
	platform_data" and other changes to atmel_console_init

Documentation/devicetree/bindings/serial/rs485.txt

@@ -0,0 +1,31 @@
+* RS485 serial communications
+
+The RTS signal is capable of automatically controlling line direction for
+the built-in half-duplex mode.
+The properties described hereafter shall be given to a half-duplex capable
+UART node.
+
+Required properties:
+- rs485-rts-delay: prop-encoded-array <a b> where:
+  * a is the delay beteween rts signal and beginning of data sent in milliseconds.
+      it corresponds to the delay before sending data.
+  * b is the delay between end of data sent and rts signal in milliseconds
+      it corresponds to the delay after sending data and actual release of the line.
+
+Optional properties:
+- linux,rs485-enabled-at-boot-time: empty property telling to enable the rs485
+  feature at boot time. It can be disabled later with proper ioctl.
+- rs485-rx-during-tx: empty property that enables the receiving of data even
+  whilst sending data.
+
+RS485 example for Atmel USART:
+	usart0: serial@fff8c000 {
+		compatible = "atmel,at91sam9260-usart";
+		reg = <0xfff8c000 0x4000>;
+		interrupts = <7>;
+		atmel,use-dma-rx;
+		atmel,use-dma-tx;
+		linux,rs485-enabled-at-boot-time;
+		rs485-rts-delay = <0 200>;		// in milliseconds
+	};
+

Documentation/devicetree/bindings/tty/serial/atmel-usart.txt

@@ -0,0 +1,27 @@
+* Atmel Universal Synchronous Asynchronous Receiver/Transmitter (USART)
+
+Required properties:
+- compatible: Should be "atmel,<chip>-usart"
+  The compatible <chip> indicated will be the first SoC to support an
+  additional mode or an USART new feature.
+- reg: Should contain registers location and length
+- interrupts: Should contain interrupt
+
+Optional properties:
+- atmel,use-dma-rx: use of PDC or DMA for receiving data
+- atmel,use-dma-tx: use of PDC or DMA for transmitting data
+
+<chip> compatible description:
+- at91rm9200:  legacy USART support
+- at91sam9260: generic USART implementation for SAM9 SoCs
+
+Example:
+
+	usart0: serial@fff8c000 {
+		compatible = "atmel,at91sam9260-usart";
+		reg = <0xfff8c000 0x4000>;
+		interrupts = <7>;
+		atmel,use-dma-rx;
+		atmel,use-dma-tx;
+	};
+

Documentation/devicetree/bindings/tty/serial/snps-dw-apb-uart.txt

@@ -0,0 +1,25 @@
+* Synopsys DesignWare ABP UART
+
+Required properties:
+- compatible : "snps,dw-apb-uart"
+- reg : offset and length of the register set for the device.
+- interrupts : should contain uart interrupt.
+- clock-frequency : the input clock frequency for the UART.
+
+Optional properties:
+- reg-shift : quantity to shift the register offsets by.  If this property is
+  not present then the register offsets are not shifted.
+- reg-io-width : the size (in bytes) of the IO accesses that should be
+  performed on the device.  If this property is not present then single byte
+  accesses are used.
+
+Example:
+
+	uart@80230000 {
+		compatible = "snps,dw-apb-uart";
+		reg = <0x80230000 0x100>;
+		clock-frequency = <3686400>;
+		interrupts = <10>;
+		reg-shift = <2>;
+		reg-io-width = <4>;
+	};

Documentation/serial/serial-rs485.txt

@@ -28,6 +28,10 @@
    RS485 communications. This data structure is used to set and configure RS485
    parameters in the platform data and in ioctls.
 
+   The device tree can also provide RS485 boot time parameters (see [2]
+   for bindings). The driver is in charge of filling this data structure from
+   the values given by the device tree.
+
    Any driver for devices capable of working both as RS232 and RS485 should
    provide at least the following ioctls:
 
@@ -104,6 +108,9 @@
 	rs485conf.flags |= SER_RS485_RTS_AFTER_SEND;
 	rs485conf.delay_rts_after_send = ...;
 
+	/* Set this flag if you want to receive data even whilst sending data */
+	rs485conf.flags |= SER_RS485_RX_DURING_TX;
+
 	if (ioctl (fd, TIOCSRS485, &rs485conf) < 0) {
 		/* Error handling. See errno. */
 	}
@@ -118,3 +125,4 @@
 5. REFERENCES
 
  [1]	include/linux/serial.h
+ [2]	Documentation/devicetree/bindings/serial/rs485.txt

arch/arm/Kconfig

@@ -727,7 +727,6 @@ config ARCH_S3C64XX
 	select ARCH_REQUIRE_GPIOLIB
 	select SAMSUNG_CLKSRC
 	select SAMSUNG_IRQ_VIC_TIMER
-	select SAMSUNG_IRQ_UART
 	select S3C_GPIO_TRACK
 	select S3C_GPIO_PULL_UPDOWN
 	select S3C_GPIO_CFG_S3C24XX

arch/arm/mach-s3c64xx/dev-uart.c

@@ -37,21 +37,10 @@ static struct resource s3c64xx_uart0_resource[] = {
 		.flags	= IORESOURCE_MEM,
 	},
 	[1] = {
-		.start	= IRQ_S3CUART_RX0,
-		.end	= IRQ_S3CUART_RX0,
+		.start	= IRQ_UART0,
+		.end	= IRQ_UART0,
 		.flags	= IORESOURCE_IRQ,
 	},
-	[2] = {
-		.start	= IRQ_S3CUART_TX0,
-		.end	= IRQ_S3CUART_TX0,
-		.flags	= IORESOURCE_IRQ,
-
-	},
-	[3] = {
-		.start	= IRQ_S3CUART_ERR0,
-		.end	= IRQ_S3CUART_ERR0,
-		.flags	= IORESOURCE_IRQ,
-	}
 };
 
 static struct resource s3c64xx_uart1_resource[] = {
@@ -61,19 +50,8 @@ static struct resource s3c64xx_uart1_resource[] = {
 		.flags = IORESOURCE_MEM,
 	},
 	[1] = {
-		.start	= IRQ_S3CUART_RX1,
-		.end	= IRQ_S3CUART_RX1,
-		.flags	= IORESOURCE_IRQ,
-	},
-	[2] = {
-		.start	= IRQ_S3CUART_TX1,
-		.end	= IRQ_S3CUART_TX1,
-		.flags	= IORESOURCE_IRQ,
-
-	},
-	[3] = {
-		.start	= IRQ_S3CUART_ERR1,
-		.end	= IRQ_S3CUART_ERR1,
+		.start	= IRQ_UART1,
+		.end	= IRQ_UART1,
 		.flags	= IORESOURCE_IRQ,
 	},
 };
@@ -85,19 +63,8 @@ static struct resource s3c6xx_uart2_resource[] = {
 		.flags = IORESOURCE_MEM,
 	},
 	[1] = {
-		.start	= IRQ_S3CUART_RX2,
-		.end	= IRQ_S3CUART_RX2,
-		.flags	= IORESOURCE_IRQ,
-	},
-	[2] = {
-		.start	= IRQ_S3CUART_TX2,
-		.end	= IRQ_S3CUART_TX2,
-		.flags	= IORESOURCE_IRQ,
-
-	},
-	[3] = {
-		.start	= IRQ_S3CUART_ERR2,
-		.end	= IRQ_S3CUART_ERR2,
+		.start	= IRQ_UART2,
+		.end	= IRQ_UART2,
 		.flags	= IORESOURCE_IRQ,
 	},
 };
@@ -109,19 +76,8 @@ static struct resource s3c64xx_uart3_resource[] = {
 		.flags = IORESOURCE_MEM,
 	},
 	[1] = {
-		.start	= IRQ_S3CUART_RX3,
-		.end	= IRQ_S3CUART_RX3,
-		.flags	= IORESOURCE_IRQ,
-	},
-	[2] = {
-		.start	= IRQ_S3CUART_TX3,
-		.end	= IRQ_S3CUART_TX3,
-		.flags	= IORESOURCE_IRQ,
-
-	},
-	[3] = {
-		.start	= IRQ_S3CUART_ERR3,
-		.end	= IRQ_S3CUART_ERR3,
+		.start	= IRQ_UART3,
+		.end	= IRQ_UART3,
 		.flags	= IORESOURCE_IRQ,
 	},
 };

arch/arm/mach-s3c64xx/include/mach/irqs.h

@@ -27,36 +27,6 @@
 #define IRQ_VIC0_BASE	S3C_IRQ(0)
 #define IRQ_VIC1_BASE	S3C_IRQ(32)
 
-/* UART interrupts, each UART has 4 intterupts per channel so
- * use the space between the ISA and S3C main interrupts. Note, these
- * are not in the same order as the S3C24XX series! */
-
-#define IRQ_S3CUART_BASE0	(16)
-#define IRQ_S3CUART_BASE1	(20)
-#define IRQ_S3CUART_BASE2	(24)
-#define IRQ_S3CUART_BASE3	(28)
-
-#define UART_IRQ_RXD		(0)
-#define UART_IRQ_ERR		(1)
-#define UART_IRQ_TXD		(2)
-#define UART_IRQ_MODEM		(3)
-
-#define IRQ_S3CUART_RX0		(IRQ_S3CUART_BASE0 + UART_IRQ_RXD)
-#define IRQ_S3CUART_TX0		(IRQ_S3CUART_BASE0 + UART_IRQ_TXD)
-#define IRQ_S3CUART_ERR0	(IRQ_S3CUART_BASE0 + UART_IRQ_ERR)
-
-#define IRQ_S3CUART_RX1		(IRQ_S3CUART_BASE1 + UART_IRQ_RXD)
-#define IRQ_S3CUART_TX1		(IRQ_S3CUART_BASE1 + UART_IRQ_TXD)
-#define IRQ_S3CUART_ERR1	(IRQ_S3CUART_BASE1 + UART_IRQ_ERR)
-
-#define IRQ_S3CUART_RX2		(IRQ_S3CUART_BASE2 + UART_IRQ_RXD)
-#define IRQ_S3CUART_TX2		(IRQ_S3CUART_BASE2 + UART_IRQ_TXD)
-#define IRQ_S3CUART_ERR2	(IRQ_S3CUART_BASE2 + UART_IRQ_ERR)
-
-#define IRQ_S3CUART_RX3		(IRQ_S3CUART_BASE3 + UART_IRQ_RXD)
-#define IRQ_S3CUART_TX3		(IRQ_S3CUART_BASE3 + UART_IRQ_TXD)
-#define IRQ_S3CUART_ERR3	(IRQ_S3CUART_BASE3 + UART_IRQ_ERR)
-
 /* VIC based IRQs */
 
 #define S3C64XX_IRQ_VIC0(x)	(IRQ_VIC0_BASE + (x))

arch/arm/mach-s3c64xx/irq.c

@@ -25,29 +25,6 @@
 #include <plat/irq-uart.h>
 #include <plat/cpu.h>
 
-static struct s3c_uart_irq uart_irqs[] = {
-	[0] = {
-		.regs		= S3C_VA_UART0,
-		.base_irq	= IRQ_S3CUART_BASE0,
-		.parent_irq	= IRQ_UART0,
-	},
-	[1] = {
-		.regs		= S3C_VA_UART1,
-		.base_irq	= IRQ_S3CUART_BASE1,
-		.parent_irq	= IRQ_UART1,
-	},
-	[2] = {
-		.regs		= S3C_VA_UART2,
-		.base_irq	= IRQ_S3CUART_BASE2,
-		.parent_irq	= IRQ_UART2,
-	},
-	[3] = {
-		.regs		= S3C_VA_UART3,
-		.base_irq	= IRQ_S3CUART_BASE3,
-		.parent_irq	= IRQ_UART3,
-	},
-};
-
 /* setup the sources the vic should advertise resume for, even though it
  * is not doing the wake (set_irq_wake needs to be valid) */
 #define IRQ_VIC0_RESUME (1 << (IRQ_RTC_TIC - IRQ_VIC0_BASE))
@@ -67,6 +44,4 @@ void __init s3c64xx_init_irq(u32 vic0_valid, u32 vic1_valid)
 
 	/* add the timer sub-irqs */
 	s3c_init_vic_timer_irq(5, IRQ_TIMER0);
-
-	s3c_init_uart_irqs(uart_irqs, ARRAY_SIZE(uart_irqs));
 }

arch/arm/plat-s5p/Kconfig

@@ -22,7 +22,6 @@ config PLAT_S5P
 	select PLAT_SAMSUNG
 	select SAMSUNG_CLKSRC
 	select SAMSUNG_IRQ_VIC_TIMER
-	select SAMSUNG_IRQ_UART
 	help
 	  Base platform code for Samsung's S5P series SoC.
 

arch/arm/plat-s5p/dev-uart.c

@@ -32,20 +32,10 @@ static struct resource s5p_uart0_resource[] = {
 		.flags	= IORESOURCE_MEM,
 	},
 	[1] = {
-		.start	= IRQ_S5P_UART_RX0,
-		.end	= IRQ_S5P_UART_RX0,
+		.start	= IRQ_UART0,
+		.end	= IRQ_UART0,
 		.flags	= IORESOURCE_IRQ,
 	},
-	[2] = {
-		.start	= IRQ_S5P_UART_TX0,
-		.end	= IRQ_S5P_UART_TX0,
-		.flags	= IORESOURCE_IRQ,
-	},
-	[3] = {
-		.start	= IRQ_S5P_UART_ERR0,
-		.end	= IRQ_S5P_UART_ERR0,
-		.flags	= IORESOURCE_IRQ,
-	}
 };
 
 static struct resource s5p_uart1_resource[] = {
@@ -55,18 +45,8 @@ static struct resource s5p_uart1_resource[] = {
 		.flags	= IORESOURCE_MEM,
 	},
 	[1] = {
-		.start	= IRQ_S5P_UART_RX1,
-		.end	= IRQ_S5P_UART_RX1,
-		.flags	= IORESOURCE_IRQ,
-	},
-	[2] = {
-		.start	= IRQ_S5P_UART_TX1,
-		.end	= IRQ_S5P_UART_TX1,
-		.flags	= IORESOURCE_IRQ,
-	},
-	[3] = {
-		.start	= IRQ_S5P_UART_ERR1,
-		.end	= IRQ_S5P_UART_ERR1,
+		.start	= IRQ_UART1,
+		.end	= IRQ_UART1,
 		.flags	= IORESOURCE_IRQ,
 	},
 };
@@ -78,18 +58,8 @@ static struct resource s5p_uart2_resource[] = {
 		.flags	= IORESOURCE_MEM,
 	},
 	[1] = {
-		.start	= IRQ_S5P_UART_RX2,
-		.end	= IRQ_S5P_UART_RX2,
-		.flags	= IORESOURCE_IRQ,
-	},
-	[2] = {
-		.start	= IRQ_S5P_UART_TX2,
-		.end	= IRQ_S5P_UART_TX2,
-		.flags	= IORESOURCE_IRQ,
-	},
-	[3] = {
-		.start	= IRQ_S5P_UART_ERR2,
-		.end	= IRQ_S5P_UART_ERR2,
+		.start	= IRQ_UART2,
+		.end	= IRQ_UART2,
 		.flags	= IORESOURCE_IRQ,
 	},
 };
@@ -102,18 +72,8 @@ static struct resource s5p_uart3_resource[] = {
 		.flags	= IORESOURCE_MEM,
 	},
 	[1] = {
-		.start	= IRQ_S5P_UART_RX3,
-		.end	= IRQ_S5P_UART_RX3,
-		.flags	= IORESOURCE_IRQ,
-	},
-	[2] = {
-		.start	= IRQ_S5P_UART_TX3,
-		.end	= IRQ_S5P_UART_TX3,
-		.flags	= IORESOURCE_IRQ,
-	},
-	[3] = {
-		.start	= IRQ_S5P_UART_ERR3,
-		.end	= IRQ_S5P_UART_ERR3,
+		.start	= IRQ_UART3,
+		.end	= IRQ_UART3,
 		.flags	= IORESOURCE_IRQ,
 	},
 #endif
@@ -127,18 +87,8 @@ static struct resource s5p_uart4_resource[] = {
 		.flags	= IORESOURCE_MEM,
 	},
 	[1] = {
-		.start	= IRQ_S5P_UART_RX4,
-		.end	= IRQ_S5P_UART_RX4,
-		.flags	= IORESOURCE_IRQ,
-	},
-	[2] = {
-		.start	= IRQ_S5P_UART_TX4,
-		.end	= IRQ_S5P_UART_TX4,
-		.flags	= IORESOURCE_IRQ,
-	},
-	[3] = {
-		.start	= IRQ_S5P_UART_ERR4,
-		.end	= IRQ_S5P_UART_ERR4,
+		.start	= IRQ_UART4,
+		.end	= IRQ_UART4,
 		.flags	= IORESOURCE_IRQ,
 	},
 #endif
@@ -152,18 +102,8 @@ static struct resource s5p_uart5_resource[] = {
 		.flags	= IORESOURCE_MEM,
 	},
 	[1] = {
-		.start	= IRQ_S5P_UART_RX5,
-		.end	= IRQ_S5P_UART_RX5,
-		.flags	= IORESOURCE_IRQ,
-	},
-	[2] = {
-		.start	= IRQ_S5P_UART_TX5,
-		.end	= IRQ_S5P_UART_TX5,
-		.flags	= IORESOURCE_IRQ,
-	},
-	[3] = {
-		.start	= IRQ_S5P_UART_ERR5,
-		.end	= IRQ_S5P_UART_ERR5,
+		.start	= IRQ_UART5,
+		.end	= IRQ_UART5,
 		.flags	= IORESOURCE_IRQ,
 	},
 #endif

arch/arm/plat-s5p/include/plat/irqs.h

@@ -37,41 +37,6 @@
 #define IRQ_VIC1_BASE		S5P_VIC1_BASE
 #define IRQ_VIC2_BASE		S5P_VIC2_BASE
 
-/* UART interrupts, each UART has 4 intterupts per channel so
- * use the space between the ISA and S3C main interrupts. Note, these
- * are not in the same order as the S3C24XX series! */
-
-#define IRQ_S5P_UART_BASE0	(16)
-#define IRQ_S5P_UART_BASE1	(20)
-#define IRQ_S5P_UART_BASE2	(24)
-#define IRQ_S5P_UART_BASE3	(28)
-
-#define UART_IRQ_RXD		(0)
-#define UART_IRQ_ERR		(1)
-#define UART_IRQ_TXD		(2)
-
-#define IRQ_S5P_UART_RX0	(IRQ_S5P_UART_BASE0 + UART_IRQ_RXD)
-#define IRQ_S5P_UART_TX0	(IRQ_S5P_UART_BASE0 + UART_IRQ_TXD)
-#define IRQ_S5P_UART_ERR0	(IRQ_S5P_UART_BASE0 + UART_IRQ_ERR)
-
-#define IRQ_S5P_UART_RX1	(IRQ_S5P_UART_BASE1 + UART_IRQ_RXD)
-#define IRQ_S5P_UART_TX1	(IRQ_S5P_UART_BASE1 + UART_IRQ_TXD)
-#define IRQ_S5P_UART_ERR1	(IRQ_S5P_UART_BASE1 + UART_IRQ_ERR)
-
-#define IRQ_S5P_UART_RX2	(IRQ_S5P_UART_BASE2 + UART_IRQ_RXD)
-#define IRQ_S5P_UART_TX2	(IRQ_S5P_UART_BASE2 + UART_IRQ_TXD)
-#define IRQ_S5P_UART_ERR2	(IRQ_S5P_UART_BASE2 + UART_IRQ_ERR)
-
-#define IRQ_S5P_UART_RX3	(IRQ_S5P_UART_BASE3 + UART_IRQ_RXD)
-#define IRQ_S5P_UART_TX3	(IRQ_S5P_UART_BASE3 + UART_IRQ_TXD)
-#define IRQ_S5P_UART_ERR3	(IRQ_S5P_UART_BASE3 + UART_IRQ_ERR)
-
-/* S3C compatibilty defines */
-#define IRQ_S3CUART_RX0		IRQ_S5P_UART_RX0
-#define IRQ_S3CUART_RX1		IRQ_S5P_UART_RX1
-#define IRQ_S3CUART_RX2		IRQ_S5P_UART_RX2
-#define IRQ_S3CUART_RX3		IRQ_S5P_UART_RX3
-
 /* VIC based IRQs */
 
 #define S5P_IRQ_VIC0(x)		(S5P_VIC0_BASE + (x))

arch/arm/plat-s5p/irq.c

@@ -17,42 +17,10 @@
 
 #include <asm/hardware/vic.h>
 
-#include <linux/serial_core.h>
 #include <mach/map.h>
 #include <plat/regs-timer.h>
-#include <plat/regs-serial.h>
 #include <plat/cpu.h>
 #include <plat/irq-vic-timer.h>
-#include <plat/irq-uart.h>
-
-/*
- * Note, we make use of the fact that the parent IRQs, IRQ_UART[0..3]
- * are consecutive when looking up the interrupt in the demux routines.
- */
-static struct s3c_uart_irq uart_irqs[] = {
-	[0] = {
-		.regs		= S5P_VA_UART0,
-		.base_irq	= IRQ_S5P_UART_BASE0,
-		.parent_irq	= IRQ_UART0,
-	},
-	[1] = {
-		.regs		= S5P_VA_UART1,
-		.base_irq	= IRQ_S5P_UART_BASE1,
-		.parent_irq	= IRQ_UART1,
-	},
-	[2] = {
-		.regs		= S5P_VA_UART2,
-		.base_irq	= IRQ_S5P_UART_BASE2,
-		.parent_irq	= IRQ_UART2,
-	},
-#if CONFIG_SERIAL_SAMSUNG_UARTS > 3
-	[3] = {
-		.regs		= S5P_VA_UART3,
-		.base_irq	= IRQ_S5P_UART_BASE3,
-		.parent_irq	= IRQ_UART3,
-	},
-#endif
-};
 
 void __init s5p_init_irq(u32 *vic, u32 num_vic)
 {
@@ -65,6 +33,4 @@ void __init s5p_init_irq(u32 *vic, u32 num_vic)
 #endif
 
 	s3c_init_vic_timer_irq(5, IRQ_TIMER0);
-
-	s3c_init_uart_irqs(uart_irqs, ARRAY_SIZE(uart_irqs));
 }

arch/arm/plat-samsung/Kconfig

@@ -65,11 +65,6 @@ config SAMSUNG_IRQ_VIC_TIMER
        help
          Internal configuration to build the VIC timer interrupt code.
 
-config SAMSUNG_IRQ_UART
-       bool
-       help
-         Internal configuration to build the IRQ UART demux code.
-
 # options for gpio configuration support
 
 config SAMSUNG_GPIOLIB_4BIT

arch/arm/plat-samsung/Makefile

@@ -21,7 +21,6 @@ obj-y				+= dev-asocdma.o
 
 obj-$(CONFIG_SAMSUNG_CLKSRC)	+= clock-clksrc.o
 
-obj-$(CONFIG_SAMSUNG_IRQ_UART)	+= irq-uart.o
 obj-$(CONFIG_SAMSUNG_IRQ_VIC_TIMER) += irq-vic-timer.o
 
 # ADC

arch/arm/plat-samsung/include/plat/regs-serial.h

@@ -186,6 +186,11 @@
 #define S3C64XX_UINTSP		0x34
 #define S3C64XX_UINTM		0x38
 
+#define S3C64XX_UINTM_RXD	(0)
+#define S3C64XX_UINTM_TXD	(2)
+#define S3C64XX_UINTM_RXD_MSK	(1 << S3C64XX_UINTM_RXD)
+#define S3C64XX_UINTM_TXD_MSK	(1 << S3C64XX_UINTM_TXD)
+
 /* Following are specific to S5PV210 */
 #define S5PV210_UCON_CLKMASK	(1<<10)
 #define S5PV210_UCON_PCLK	(0<<10)

arch/arm/plat-samsung/irq-uart.c

@@ -1,96 +0,0 @@
-/* arch/arm/plat-samsung/irq-uart.c
- *	originally part of arch/arm/plat-s3c64xx/irq.c
- *
- * Copyright 2008 Openmoko, Inc.
- * Copyright 2008 Simtec Electronics
- *      Ben Dooks <ben@simtec.co.uk>
- *      http://armlinux.simtec.co.uk/
- *
- * Samsung- UART Interrupt handling
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-#include <linux/kernel.h>
-#include <linux/interrupt.h>
-#include <linux/serial_core.h>
-#include <linux/irq.h>
-#include <linux/io.h>
-
-#include <asm/mach/irq.h>
-
-#include <mach/map.h>
-#include <plat/irq-uart.h>
-#include <plat/regs-serial.h>
-#include <plat/cpu.h>
-
-/* Note, we make use of the fact that the parent IRQs, IRQ_UART[0..3]
- * are consecutive when looking up the interrupt in the demux routines.
- */
-static void s3c_irq_demux_uart(unsigned int irq, struct irq_desc *desc)
-{
-	struct s3c_uart_irq *uirq = desc->irq_data.handler_data;
-	struct irq_chip *chip = irq_get_chip(irq);
-	u32 pend = __raw_readl(uirq->regs + S3C64XX_UINTP);
-	int base = uirq->base_irq;
-
-	chained_irq_enter(chip, desc);
-
-	if (pend & (1 << 0))
-		generic_handle_irq(base);
-	if (pend & (1 << 1))
-		generic_handle_irq(base + 1);
-	if (pend & (1 << 2))
-		generic_handle_irq(base + 2);
-	if (pend & (1 << 3))
-		generic_handle_irq(base + 3);
-
-	chained_irq_exit(chip, desc);
-}
-
-static void __init s3c_init_uart_irq(struct s3c_uart_irq *uirq)
-{
-	void __iomem *reg_base = uirq->regs;
-	struct irq_chip_generic *gc;
-	struct irq_chip_type *ct;
-
-	/* mask all interrupts at the start. */
-	__raw_writel(0xf, reg_base + S3C64XX_UINTM);
-
-	gc = irq_alloc_generic_chip("s3c-uart", 1, uirq->base_irq, reg_base,
-				    handle_level_irq);
-
-	if (!gc) {
-		pr_err("%s: irq_alloc_generic_chip for IRQ %u failed\n",
-		       __func__, uirq->base_irq);
-		return;
-	}
-
-	ct = gc->chip_types;
-	ct->chip.irq_ack = irq_gc_ack_set_bit;
-	ct->chip.irq_mask = irq_gc_mask_set_bit;
-	ct->chip.irq_unmask = irq_gc_mask_clr_bit;
-	ct->regs.ack = S3C64XX_UINTP;
-	ct->regs.mask = S3C64XX_UINTM;
-	irq_setup_generic_chip(gc, IRQ_MSK(4), IRQ_GC_INIT_MASK_CACHE,
-			       IRQ_NOREQUEST | IRQ_NOPROBE, 0);
-
-	irq_set_handler_data(uirq->parent_irq, uirq);
-	irq_set_chained_handler(uirq->parent_irq, s3c_irq_demux_uart);
-}
-
-/**
- * s3c_init_uart_irqs() - initialise UART IRQs and the necessary demuxing
- * @irq: The interrupt data for registering
- * @nr_irqs: The number of interrupt descriptions in @irq.
- *
- * Register the UART interrupts specified by @irq including the demuxing
- * routines. This supports the S3C6400 and newer style of devices.
- */
-void __init s3c_init_uart_irqs(struct s3c_uart_irq *irq, unsigned int nr_irqs)
-{
-	for (; nr_irqs > 0; nr_irqs--, irq++)
-		s3c_init_uart_irq(irq);
-}

arch/h8300/Kconfig

@@ -195,7 +195,7 @@ config UNIX98_PTYS
 
 source "drivers/char/pcmcia/Kconfig"
 
-source "drivers/serial/Kconfig"
+source "drivers/tty/serial/Kconfig"
 
 source "drivers/i2c/Kconfig"
 

arch/mips/pmc-sierra/msp71xx/msp_serial.c

@@ -27,6 +27,7 @@
 #include <linux/serial.h>
 #include <linux/serial_core.h>
 #include <linux/serial_reg.h>
+#include <linux/slab.h>
 
 #include <asm/bootinfo.h>
 #include <asm/io.h>
@@ -38,6 +39,55 @@
 #include <msp_int.h>
 #include <msp_regs.h>
 
+struct msp_uart_data {
+	int	last_lcr;
+};
+
+static void msp_serial_out(struct uart_port *p, int offset, int value)
+{
+	struct msp_uart_data *d = p->private_data;
+
+	if (offset == UART_LCR)
+		d->last_lcr = value;
+
+	offset <<= p->regshift;
+	writeb(value, p->membase + offset);
+}
+
+static unsigned int msp_serial_in(struct uart_port *p, int offset)
+{
+	offset <<= p->regshift;
+
+	return readb(p->membase + offset);
+}
+
+static int msp_serial_handle_irq(struct uart_port *p)
+{
+	struct msp_uart_data *d = p->private_data;
+	unsigned int iir = readb(p->membase + (UART_IIR << p->regshift));
+
+	if (serial8250_handle_irq(p, iir)) {
+		return 1;
+	} else if ((iir & UART_IIR_BUSY) == UART_IIR_BUSY) {
+		/*
+		 * The DesignWare APB UART has an Busy Detect (0x07) interrupt
+		 * meaning an LCR write attempt occurred while the UART was
+		 * busy. The interrupt must be cleared by reading the UART
+		 * status register (USR) and the LCR re-written.
+		 *
+		 * Note: MSP reserves 0x20 bytes of address space for the UART
+		 * and the USR is mapped in a separate block at an offset of
+		 * 0xc0 from the start of the UART.
+		 */
+		(void)readb(p->membase + 0xc0);
+		writeb(d->last_lcr, p->membase + (UART_LCR << p->regshift));
+
+		return 1;
+	}
+
+	return 0;
+}
+
 void __init msp_serial_setup(void)
 {
 	char    *s;
@@ -59,13 +109,22 @@ void __init msp_serial_setup(void)
 	up.irq          = MSP_INT_UART0;
 	up.uartclk      = uartclk;
 	up.regshift     = 2;
-	up.iotype       = UPIO_DWAPB; /* UPIO_MEM like */
+	up.iotype       = UPIO_MEM;
 	up.flags        = ASYNC_BOOT_AUTOCONF | ASYNC_SKIP_TEST;
 	up.type         = PORT_16550A;
 	up.line         = 0;
-	up.private_data		= (void*)UART0_STATUS_REG;
-	if (early_serial_setup(&up))
-		printk(KERN_ERR "Early serial init of port 0 failed\n");
+	up.serial_out	= msp_serial_out;
+	up.serial_in	= msp_serial_in;
+	up.handle_irq	= msp_serial_handle_irq;
+	up.private_data	= kzalloc(sizeof(struct msp_uart_data), GFP_KERNEL);
+	if (!up.private_data) {
+		pr_err("failed to allocate uart private data\n");
+		return;
+	}
+	if (early_serial_setup(&up)) {
+		kfree(up.private_data);
+		pr_err("Early serial init of port 0 failed\n");
+	}
 
 	/* Initialize the second serial port, if one exists */
 	switch (mips_machtype) {
@@ -88,6 +147,8 @@ void __init msp_serial_setup(void)
 	up.irq          = MSP_INT_UART1;
 	up.line         = 1;
 	up.private_data		= (void*)UART1_STATUS_REG;
-	if (early_serial_setup(&up))
-		printk(KERN_ERR "Early serial init of port 1 failed\n");
+	if (early_serial_setup(&up)) {
+		kfree(up.private_data);
+		pr_err("Early serial init of port 1 failed\n");
+	}
 }

arch/powerpc/include/asm/udbg.h

@@ -54,6 +54,7 @@ extern void __init udbg_init_40x_realmode(void);
 extern void __init udbg_init_cpm(void);
 extern void __init udbg_init_usbgecko(void);
 extern void __init udbg_init_wsp(void);
+extern void __init udbg_init_ehv_bc(void);
 
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_UDBG_H */

arch/powerpc/kernel/udbg.c

@@ -67,6 +67,8 @@ void __init udbg_early_init(void)
 	udbg_init_usbgecko();
 #elif defined(CONFIG_PPC_EARLY_DEBUG_WSP)
 	udbg_init_wsp();
+#elif defined(CONFIG_PPC_EARLY_DEBUG_EHV_BC)
+	udbg_init_ehv_bc();
 #endif
 
 #ifdef CONFIG_PPC_EARLY_DEBUG

arch/x86/platform/mrst/mrst.c

@@ -14,6 +14,8 @@
 
 #include <linux/init.h>
 #include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/scatterlist.h>
 #include <linux/sfi.h>
 #include <linux/intel_pmic_gpio.h>
 #include <linux/spi/spi.h>
@@ -392,6 +394,7 @@ static void __init *max3111_platform_data(void *info)
 	struct spi_board_info *spi_info = info;
 	int intr = get_gpio_by_name("max3111_int");
 
+	spi_info->mode = SPI_MODE_0;
 	if (intr == -1)
 		return NULL;
 	spi_info->irq = intr + MRST_IRQ_OFFSET;

drivers/isdn/i4l/isdn_tty.c

@@ -1693,7 +1693,7 @@ isdn_tty_close(struct tty_struct *tty, struct file *filp)
 	 * line status register.
 	 */
 	if (info->flags & ISDN_ASYNC_INITIALIZED) {
-		tty_wait_until_sent(tty, 3000);	/* 30 seconds timeout */
+		tty_wait_until_sent_from_close(tty, 3000);	/* 30 seconds timeout */
 		/*
 		 * Before we drop DTR, make sure the UART transmitter
 		 * has completely drained; this is especially

drivers/parport/parport_pc.c

@@ -2595,14 +2595,17 @@ static int __devinit sio_ite_8872_probe(struct pci_dev *pdev, int autoirq,
 		break;
 	case 0x6:
 		printk(KERN_INFO "parport_pc: ITE8873 found (1S)\n");
+		release_region(inta_addr[i], 32);
 		return 0;
 	case 0x8:
 		printk(KERN_INFO "parport_pc: ITE8874 found (2S)\n");
+		release_region(inta_addr[i], 32);
 		return 0;
 	default:
 		printk(KERN_INFO "parport_pc: unknown ITE887x\n");
 		printk(KERN_INFO "parport_pc: please mail 'lspci -nvv' "
 			"output to Rich.Liu@ite.com.tw\n");
+		release_region(inta_addr[i], 32);
 		return 0;
 	}
 

drivers/staging/Kconfig

@@ -24,6 +24,8 @@ menuconfig STAGING
 
 if STAGING
 
+source "drivers/staging/serial/Kconfig"
+
 source "drivers/staging/et131x/Kconfig"
 
 source "drivers/staging/slicoss/Kconfig"

drivers/staging/Makefile

@@ -3,6 +3,7 @@
 # fix for build system bug...
 obj-$(CONFIG_STAGING)		+= staging.o
 
+obj-y				+= serial/
 obj-$(CONFIG_ET131X)		+= et131x/
 obj-$(CONFIG_SLICOSS)		+= slicoss/
 obj-$(CONFIG_VIDEO_GO7007)	+= go7007/

drivers/staging/serial/Kconfig

@@ -0,0 +1,16 @@
+config SERIAL_68360_SMC
+	bool "68360 SMC uart support"
+	depends on M68360
+	help
+	  This driver supports the SMC serial ports of the Motorola 68360 CPU.
+
+config SERIAL_68360_SCC
+	bool "68360 SCC uart support"
+	depends on M68360
+	help
+	  This driver supports the SCC serial ports of the Motorola 68360 CPU.
+
+config SERIAL_68360
+	bool
+	depends on SERIAL_68360_SMC || SERIAL_68360_SCC
+	default y

drivers/staging/serial/Makefile

@@ -0,0 +1 @@
+obj-$(CONFIG_SERIAL_68360) += 68360serial.o

drivers/staging/serial/TODO

@@ -0,0 +1,6 @@
+These are a few serial drivers that either do not build, or do not work if they
+do build, or if they seem to work, are for obsolete hardware, or are full of
+unfixable races and no one uses them anymore.
+
+If no one steps up to adopt any of these drivers, they will be removed
+in the 3.4 release.

drivers/tty/Kconfig

@@ -354,3 +354,37 @@ config TRACE_SINK
 
 	  If you select this option, you need to select
 	  "Trace data router for MIPI P1149.7 cJTAG standard".
+
+config PPC_EPAPR_HV_BYTECHAN
+	tristate "ePAPR hypervisor byte channel driver"
+	depends on PPC
+	help
+	  This driver creates /dev entries for each ePAPR hypervisor byte
+	  channel, thereby allowing applications to communicate with byte
+	  channels as if they were serial ports.
+
+config PPC_EARLY_DEBUG_EHV_BC
+	bool "Early console (udbg) support for ePAPR hypervisors"
+	depends on PPC_EPAPR_HV_BYTECHAN
+	help
+	  Select this option to enable early console (a.k.a. "udbg") support
+	  via an ePAPR byte channel.  You also need to choose the byte channel
+	  handle below.
+
+config PPC_EARLY_DEBUG_EHV_BC_HANDLE
+	int "Byte channel handle for early console (udbg)"
+	depends on PPC_EARLY_DEBUG_EHV_BC
+	default 0
+	help
+	  If you want early console (udbg) output through a byte channel,
+	  specify the handle of the byte channel to use.
+
+	  For this to work, the byte channel driver must be compiled
+	  in-kernel, not as a module.
+
+	  Note that only one early console driver can be enabled, so don't
+	  enable any others if you enable this one.
+
+	  If the number you specify is not a valid byte channel handle, then
+	  there simply will be no early console output.  This is true also
+	  if you don't boot under a hypervisor at all.

drivers/tty/Makefile

@@ -26,5 +26,6 @@ obj-$(CONFIG_ROCKETPORT)	+= rocket.o
 obj-$(CONFIG_SYNCLINK_GT)	+= synclink_gt.o
 obj-$(CONFIG_SYNCLINKMP)	+= synclinkmp.o
 obj-$(CONFIG_SYNCLINK)		+= synclink.o
+obj-$(CONFIG_PPC_EPAPR_HV_BYTECHAN) += ehv_bytechan.o
 
 obj-y += ipwireless/

drivers/tty/amiserial.c

@@ -1529,7 +1529,6 @@ static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
 {
 	struct async_struct * info = tty->driver_data;
 	unsigned long orig_jiffies, char_time;
-	int tty_was_locked = tty_locked();
 	int lsr;
 
 	if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
@@ -1540,12 +1539,6 @@ static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
 
 	orig_jiffies = jiffies;
 
-	/*
-	 * tty_wait_until_sent is called from lots of places,
-	 * with or without the BTM.
-	 */
-	if (!tty_was_locked)
-		tty_lock();
 	/*
 	 * Set the check interval to be 1/5 of the estimated time to
 	 * send a single character, and make it at least 1.  The check
@@ -1586,8 +1579,7 @@ static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
 			break;
 	}
 	__set_current_state(TASK_RUNNING);
-	if (!tty_was_locked)
-		tty_unlock();
+
 #ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
 	printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
 #endif
@@ -2025,7 +2017,7 @@ static int __init amiga_serial_probe(struct platform_device *pdev)
 	if (error)
 		goto fail_unregister;
 
-	error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, IRQF_DISABLED,
+	error = request_irq(IRQ_AMIGA_RBF, ser_rx_int, 0,
 			    "serial RX", state);
 	if (error)
 		goto fail_free_irq;

drivers/tty/cyclades.c

@@ -45,7 +45,6 @@
 #undef	CY_DEBUG_IO
 #undef	CY_DEBUG_COUNT
 #undef	CY_DEBUG_DTR
-#undef	CY_DEBUG_WAIT_UNTIL_SENT
 #undef	CY_DEBUG_INTERRUPTS
 #undef	CY_16Y_HACK
 #undef	CY_ENABLE_MONITORING
@@ -1678,16 +1677,10 @@ static void cy_wait_until_sent(struct tty_struct *tty, int timeout)
 	 */
 	if (!timeout || timeout > 2 * info->timeout)
 		timeout = 2 * info->timeout;
-#ifdef CY_DEBUG_WAIT_UNTIL_SENT
-	printk(KERN_DEBUG "In cy_wait_until_sent(%d) check=%d, jiff=%lu...",
-		timeout, char_time, jiffies);
-#endif
+
 	card = info->card;
 	if (!cy_is_Z(card)) {
 		while (cyy_readb(info, CySRER) & CyTxRdy) {
-#ifdef CY_DEBUG_WAIT_UNTIL_SENT
-			printk(KERN_DEBUG "Not clean (jiff=%lu)...", jiffies);
-#endif
 			if (msleep_interruptible(jiffies_to_msecs(char_time)))
 				break;
 			if (timeout && time_after(jiffies, orig_jiffies +
@@ -1697,9 +1690,6 @@ static void cy_wait_until_sent(struct tty_struct *tty, int timeout)
 	}
 	/* Run one more char cycle */
 	msleep_interruptible(jiffies_to_msecs(char_time * 5));
-#ifdef CY_DEBUG_WAIT_UNTIL_SENT
-	printk(KERN_DEBUG "Clean (jiff=%lu)...done\n", jiffies);
-#endif
 }
 
 static void cy_flush_buffer(struct tty_struct *tty)
@@ -3377,7 +3367,7 @@ static int __init cy_detect_isa(void)
 
 		/* allocate IRQ */
 		if (request_irq(cy_isa_irq, cyy_interrupt,
-				IRQF_DISABLED, "Cyclom-Y", &cy_card[j])) {
+				0, "Cyclom-Y", &cy_card[j])) {
 			printk(KERN_ERR "Cyclom-Y/ISA found at 0x%lx, but "
 				"could not allocate IRQ#%d.\n",
 				(unsigned long)cy_isa_address, cy_isa_irq);

drivers/tty/ehv_bytechan.c

@@ -0,0 +1,881 @@
+/* ePAPR hypervisor byte channel device driver
+ *
+ * Copyright 2009-2011 Freescale Semiconductor, Inc.
+ *
+ * Author: Timur Tabi <timur@freescale.com>
+ *
+ * This file is licensed under the terms of the GNU General Public License
+ * version 2.  This program is licensed "as is" without any warranty of any
+ * kind, whether express or implied.
+ *
+ * This driver support three distinct interfaces, all of which are related to
+ * ePAPR hypervisor byte channels.
+ *
+ * 1) An early-console (udbg) driver.  This provides early console output
+ * through a byte channel.  The byte channel handle must be specified in a
+ * Kconfig option.
+ *
+ * 2) A normal console driver.  Output is sent to the byte channel designated
+ * for stdout in the device tree.  The console driver is for handling kernel
+ * printk calls.
+ *
+ * 3) A tty driver, which is used to handle user-space input and output.  The
+ * byte channel used for the console is designated as the default tty.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <asm/epapr_hcalls.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/cdev.h>
+#include <linux/console.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/circ_buf.h>
+#include <asm/udbg.h>
+
+/* The size of the transmit circular buffer.  This must be a power of two. */
+#define BUF_SIZE	2048
+
+/* Per-byte channel private data */
+struct ehv_bc_data {
+	struct device *dev;
+	struct tty_port port;
+	uint32_t handle;
+	unsigned int rx_irq;
+	unsigned int tx_irq;
+
+	spinlock_t lock;	/* lock for transmit buffer */
+	unsigned char buf[BUF_SIZE];	/* transmit circular buffer */
+	unsigned int head;	/* circular buffer head */
+	unsigned int tail;	/* circular buffer tail */
+
+	int tx_irq_enabled;	/* true == TX interrupt is enabled */
+};
+
+/* Array of byte channel objects */
+static struct ehv_bc_data *bcs;
+
+/* Byte channel handle for stdout (and stdin), taken from device tree */
+static unsigned int stdout_bc;
+
+/* Virtual IRQ for the byte channel handle for stdin, taken from device tree */
+static unsigned int stdout_irq;
+
+/**************************** SUPPORT FUNCTIONS ****************************/
+
+/*
+ * Enable the transmit interrupt
+ *
+ * Unlike a serial device, byte channels have no mechanism for disabling their
+ * own receive or transmit interrupts.  To emulate that feature, we toggle
+ * the IRQ in the kernel.
+ *
+ * We cannot just blindly call enable_irq() or disable_irq(), because these
+ * calls are reference counted.  This means that we cannot call enable_irq()
+ * if interrupts are already enabled.  This can happen in two situations:
+ *
+ * 1. The tty layer makes two back-to-back calls to ehv_bc_tty_write()
+ * 2. A transmit interrupt occurs while executing ehv_bc_tx_dequeue()
+ *
+ * To work around this, we keep a flag to tell us if the IRQ is enabled or not.
+ */
+static void enable_tx_interrupt(struct ehv_bc_data *bc)
+{
+	if (!bc->tx_irq_enabled) {
+		enable_irq(bc->tx_irq);
+		bc->tx_irq_enabled = 1;
+	}
+}
+
+static void disable_tx_interrupt(struct ehv_bc_data *bc)
+{
+	if (bc->tx_irq_enabled) {
+		disable_irq_nosync(bc->tx_irq);
+		bc->tx_irq_enabled = 0;
+	}
+}
+
+/*
+ * find the byte channel handle to use for the console
+ *
+ * The byte channel to be used for the console is specified via a "stdout"
+ * property in the /chosen node.
+ *
+ * For compatible with legacy device trees, we also look for a "stdout" alias.
+ */
+static int find_console_handle(void)
+{
+	struct device_node *np, *np2;
+	const char *sprop = NULL;
+	const uint32_t *iprop;
+
+	np = of_find_node_by_path("/chosen");
+	if (np)
+		sprop = of_get_property(np, "stdout-path", NULL);
+
+	if (!np || !sprop) {
+		of_node_put(np);
+		np = of_find_node_by_name(NULL, "aliases");
+		if (np)
+			sprop = of_get_property(np, "stdout", NULL);
+	}
+
+	if (!sprop) {
+		of_node_put(np);
+		return 0;
+	}
+
+	/* We don't care what the aliased node is actually called.  We only
+	 * care if it's compatible with "epapr,hv-byte-channel", because that
+	 * indicates that it's a byte channel node.  We use a temporary
+	 * variable, 'np2', because we can't release 'np' until we're done with
+	 * 'sprop'.
+	 */
+	np2 = of_find_node_by_path(sprop);
+	of_node_put(np);
+	np = np2;
+	if (!np) {
+		pr_warning("ehv-bc: stdout node '%s' does not exist\n", sprop);
+		return 0;
+	}
+
+	/* Is it a byte channel? */
+	if (!of_device_is_compatible(np, "epapr,hv-byte-channel")) {
+		of_node_put(np);
+		return 0;
+	}
+
+	stdout_irq = irq_of_parse_and_map(np, 0);
+	if (stdout_irq == NO_IRQ) {
+		pr_err("ehv-bc: no 'interrupts' property in %s node\n", sprop);
+		of_node_put(np);
+		return 0;
+	}
+
+	/*
+	 * The 'hv-handle' property contains the handle for this byte channel.
+	 */
+	iprop = of_get_property(np, "hv-handle", NULL);
+	if (!iprop) {
+		pr_err("ehv-bc: no 'hv-handle' property in %s node\n",
+		       np->name);
+		of_node_put(np);
+		return 0;
+	}
+	stdout_bc = be32_to_cpu(*iprop);
+
+	of_node_put(np);
+	return 1;
+}
+
+/*************************** EARLY CONSOLE DRIVER ***************************/
+
+#ifdef CONFIG_PPC_EARLY_DEBUG_EHV_BC
+
+/*
+ * send a byte to a byte channel, wait if necessary
+ *
+ * This function sends a byte to a byte channel, and it waits and
+ * retries if the byte channel is full.  It returns if the character
+ * has been sent, or if some error has occurred.
+ *
+ */
+static void byte_channel_spin_send(const char data)
+{
+	int ret, count;
+
+	do {
+		count = 1;
+		ret = ev_byte_channel_send(CONFIG_PPC_EARLY_DEBUG_EHV_BC_HANDLE,
+					   &count, &data);
+	} while (ret == EV_EAGAIN);
+}
+
+/*
+ * The udbg subsystem calls this function to display a single character.
+ * We convert CR to a CR/LF.
+ */
+static void ehv_bc_udbg_putc(char c)
+{
+	if (c == '\n')
+		byte_channel_spin_send('\r');
+
+	byte_channel_spin_send(c);
+}
+
+/*
+ * early console initialization
+ *
+ * PowerPC kernels support an early printk console, also known as udbg.
+ * This function must be called via the ppc_md.init_early function pointer.
+ * At this point, the device tree has been unflattened, so we can obtain the
+ * byte channel handle for stdout.
+ *
+ * We only support displaying of characters (putc).  We do not support
+ * keyboard input.
+ */
+void __init udbg_init_ehv_bc(void)
+{
+	unsigned int rx_count, tx_count;
+	unsigned int ret;
+
+	/* Verify the byte channel handle */
+	ret = ev_byte_channel_poll(CONFIG_PPC_EARLY_DEBUG_EHV_BC_HANDLE,
+				   &rx_count, &tx_count);
+	if (ret)
+		return;
+
+	udbg_putc = ehv_bc_udbg_putc;
+	register_early_udbg_console();
+
+	udbg_printf("ehv-bc: early console using byte channel handle %u\n",
+		    CONFIG_PPC_EARLY_DEBUG_EHV_BC_HANDLE);
+}
+
+#endif
+
+/****************************** CONSOLE DRIVER ******************************/
+
+static struct tty_driver *ehv_bc_driver;
+
+/*
+ * Byte channel console sending worker function.
+ *
+ * For consoles, if the output buffer is full, we should just spin until it
+ * clears.
+ */
+static int ehv_bc_console_byte_channel_send(unsigned int handle, const char *s,
+			     unsigned int count)
+{
+	unsigned int len;
+	int ret = 0;
+
+	while (count) {
+		len = min_t(unsigned int, count, EV_BYTE_CHANNEL_MAX_BYTES);
+		do {
+			ret = ev_byte_channel_send(handle, &len, s);
+		} while (ret == EV_EAGAIN);
+		count -= len;
+		s += len;
+	}
+
+	return ret;
+}
+
+/*
+ * write a string to the console
+ *
+ * This function gets called to write a string from the kernel, typically from
+ * a printk().  This function spins until all data is written.
+ *
+ * We copy the data to a temporary buffer because we need to insert a \r in
+ * front of every \n.  It's more efficient to copy the data to the buffer than
+ * it is to make multiple hcalls for each character or each newline.
+ */
+static void ehv_bc_console_write(struct console *co, const char *s,
+				 unsigned int count)
+{
+	char s2[EV_BYTE_CHANNEL_MAX_BYTES];
+	unsigned int i, j = 0;
+	char c;
+
+	for (i = 0; i < count; i++) {
+		c = *s++;
+
+		if (c == '\n')
+			s2[j++] = '\r';
+
+		s2[j++] = c;
+		if (j >= (EV_BYTE_CHANNEL_MAX_BYTES - 1)) {
+			if (ehv_bc_console_byte_channel_send(stdout_bc, s2, j))
+				return;
+			j = 0;
+		}
+	}
+
+	if (j)
+		ehv_bc_console_byte_channel_send(stdout_bc, s2, j);
+}
+
+/*
+ * When /dev/console is opened, the kernel iterates the console list looking
+ * for one with ->device and then calls that method. On success, it expects
+ * the passed-in int* to contain the minor number to use.
+ */
+static struct tty_driver *ehv_bc_console_device(struct console *co, int *index)
+{
+	*index = co->index;
+
+	return ehv_bc_driver;
+}
+
+static struct console ehv_bc_console = {
+	.name		= "ttyEHV",
+	.write		= ehv_bc_console_write,
+	.device		= ehv_bc_console_device,
+	.flags		= CON_PRINTBUFFER | CON_ENABLED,
+};
+
+/*
+ * Console initialization
+ *
+ * This is the first function that is called after the device tree is
+ * available, so here is where we determine the byte channel handle and IRQ for
+ * stdout/stdin, even though that information is used by the tty and character
+ * drivers.
+ */
+static int __init ehv_bc_console_init(void)
+{
+	if (!find_console_handle()) {
+		pr_debug("ehv-bc: stdout is not a byte channel\n");
+		return -ENODEV;
+	}
+
+#ifdef CONFIG_PPC_EARLY_DEBUG_EHV_BC
+	/* Print a friendly warning if the user chose the wrong byte channel
+	 * handle for udbg.
+	 */
+	if (stdout_bc != CONFIG_PPC_EARLY_DEBUG_EHV_BC_HANDLE)
+		pr_warning("ehv-bc: udbg handle %u is not the stdout handle\n",
+			   CONFIG_PPC_EARLY_DEBUG_EHV_BC_HANDLE);
+#endif
+
+	/* add_preferred_console() must be called before register_console(),
+	   otherwise it won't work.  However, we don't want to enumerate all the
+	   byte channels here, either, since we only care about one. */
+
+	add_preferred_console(ehv_bc_console.name, ehv_bc_console.index, NULL);
+	register_console(&ehv_bc_console);
+
+	pr_info("ehv-bc: registered console driver for byte channel %u\n",
+		stdout_bc);
+
+	return 0;
+}
+console_initcall(ehv_bc_console_init);
+
+/******************************** TTY DRIVER ********************************/
+
+/*
+ * byte channel receive interupt handler
+ *
+ * This ISR is called whenever data is available on a byte channel.
+ */
+static irqreturn_t ehv_bc_tty_rx_isr(int irq, void *data)
+{
+	struct ehv_bc_data *bc = data;
+	struct tty_struct *ttys = tty_port_tty_get(&bc->port);
+	unsigned int rx_count, tx_count, len;
+	int count;
+	char buffer[EV_BYTE_CHANNEL_MAX_BYTES];
+	int ret;
+
+	/* ttys could be NULL during a hangup */
+	if (!ttys)
+		return IRQ_HANDLED;
+
+	/* Find out how much data needs to be read, and then ask the TTY layer
+	 * if it can handle that much.  We want to ensure that every byte we
+	 * read from the byte channel will be accepted by the TTY layer.
+	 */
+	ev_byte_channel_poll(bc->handle, &rx_count, &tx_count);
+	count = tty_buffer_request_room(ttys, rx_count);
+
+	/* 'count' is the maximum amount of data the TTY layer can accept at
+	 * this time.  However, during testing, I was never able to get 'count'
+	 * to be less than 'rx_count'.  I'm not sure whether I'm calling it
+	 * correctly.
+	 */
+
+	while (count > 0) {
+		len = min_t(unsigned int, count, sizeof(buffer));
+
+		/* Read some data from the byte channel.  This function will
+		 * never return more than EV_BYTE_CHANNEL_MAX_BYTES bytes.
+		 */
+		ev_byte_channel_receive(bc->handle, &len, buffer);
+
+		/* 'len' is now the amount of data that's been received. 'len'
+		 * can't be zero, and most likely it's equal to one.
+		 */
+
+		/* Pass the received data to the tty layer. */
+		ret = tty_insert_flip_string(ttys, buffer, len);
+
+		/* 'ret' is the number of bytes that the TTY layer accepted.
+		 * If it's not equal to 'len', then it means the buffer is
+		 * full, which should never happen.  If it does happen, we can
+		 * exit gracefully, but we drop the last 'len - ret' characters
+		 * that we read from the byte channel.
+		 */
+		if (ret != len)
+			break;
+
+		count -= len;
+	}
+
+	/* Tell the tty layer that we're done. */
+	tty_flip_buffer_push(ttys);
+
+	tty_kref_put(ttys);
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * dequeue the transmit buffer to the hypervisor
+ *
+ * This function, which can be called in interrupt context, dequeues as much
+ * data as possible from the transmit buffer to the byte channel.
+ */
+static void ehv_bc_tx_dequeue(struct ehv_bc_data *bc)
+{
+	unsigned int count;
+	unsigned int len, ret;
+	unsigned long flags;
+
+	do {
+		spin_lock_irqsave(&bc->lock, flags);
+		len = min_t(unsigned int,
+			    CIRC_CNT_TO_END(bc->head, bc->tail, BUF_SIZE),
+			    EV_BYTE_CHANNEL_MAX_BYTES);
+
+		ret = ev_byte_channel_send(bc->handle, &len, bc->buf + bc->tail);
+
+		/* 'len' is valid only if the return code is 0 or EV_EAGAIN */
+		if (!ret || (ret == EV_EAGAIN))
+			bc->tail = (bc->tail + len) & (BUF_SIZE - 1);
+
+		count = CIRC_CNT(bc->head, bc->tail, BUF_SIZE);
+		spin_unlock_irqrestore(&bc->lock, flags);
+	} while (count && !ret);
+
+	spin_lock_irqsave(&bc->lock, flags);
+	if (CIRC_CNT(bc->head, bc->tail, BUF_SIZE))
+		/*
+		 * If we haven't emptied the buffer, then enable the TX IRQ.
+		 * We'll get an interrupt when there's more room in the
+		 * hypervisor's output buffer.
+		 */
+		enable_tx_interrupt(bc);
+	else
+		disable_tx_interrupt(bc);
+	spin_unlock_irqrestore(&bc->lock, flags);
+}
+
+/*
+ * byte channel transmit interupt handler
+ *
+ * This ISR is called whenever space becomes available for transmitting
+ * characters on a byte channel.
+ */
+static irqreturn_t ehv_bc_tty_tx_isr(int irq, void *data)
+{
+	struct ehv_bc_data *bc = data;
+	struct tty_struct *ttys = tty_port_tty_get(&bc->port);
+
+	ehv_bc_tx_dequeue(bc);
+	if (ttys) {
+		tty_wakeup(ttys);
+		tty_kref_put(ttys);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * This function is called when the tty layer has data for us send.  We store
+ * the data first in a circular buffer, and then dequeue as much of that data
+ * as possible.
+ *
+ * We don't need to worry about whether there is enough room in the buffer for
+ * all the data.  The purpose of ehv_bc_tty_write_room() is to tell the tty
+ * layer how much data it can safely send to us.  We guarantee that
+ * ehv_bc_tty_write_room() will never lie, so the tty layer will never send us
+ * too much data.
+ */
+static int ehv_bc_tty_write(struct tty_struct *ttys, const unsigned char *s,
+			    int count)
+{
+	struct ehv_bc_data *bc = ttys->driver_data;
+	unsigned long flags;
+	unsigned int len;
+	unsigned int written = 0;
+
+	while (1) {
+		spin_lock_irqsave(&bc->lock, flags);
+		len = CIRC_SPACE_TO_END(bc->head, bc->tail, BUF_SIZE);
+		if (count < len)
+			len = count;
+		if (len) {
+			memcpy(bc->buf + bc->head, s, len);
+			bc->head = (bc->head + len) & (BUF_SIZE - 1);
+		}
+		spin_unlock_irqrestore(&bc->lock, flags);
+		if (!len)
+			break;
+
+		s += len;
+		count -= len;
+		written += len;
+	}
+
+	ehv_bc_tx_dequeue(bc);
+
+	return written;
+}
+
+/*
+ * This function can be called multiple times for a given tty_struct, which is
+ * why we initialize bc->ttys in ehv_bc_tty_port_activate() instead.
+ *
+ * The tty layer will still call this function even if the device was not
+ * registered (i.e. tty_register_device() was not called).  This happens
+ * because tty_register_device() is optional and some legacy drivers don't
+ * use it.  So we need to check for that.
+ */
+static int ehv_bc_tty_open(struct tty_struct *ttys, struct file *filp)
+{
+	struct ehv_bc_data *bc = &bcs[ttys->index];
+
+	if (!bc->dev)
+		return -ENODEV;
+
+	return tty_port_open(&bc->port, ttys, filp);
+}
+
+/*
+ * Amazingly, if ehv_bc_tty_open() returns an error code, the tty layer will
+ * still call this function to close the tty device.  So we can't assume that
+ * the tty port has been initialized.
+ */
+static void ehv_bc_tty_close(struct tty_struct *ttys, struct file *filp)
+{
+	struct ehv_bc_data *bc = &bcs[ttys->index];
+
+	if (bc->dev)
+		tty_port_close(&bc->port, ttys, filp);
+}
+
+/*
+ * Return the amount of space in the output buffer
+ *
+ * This is actually a contract between the driver and the tty layer outlining
+ * how much write room the driver can guarantee will be sent OR BUFFERED.  This
+ * driver MUST honor the return value.
+ */
+static int ehv_bc_tty_write_room(struct tty_struct *ttys)
+{
+	struct ehv_bc_data *bc = ttys->driver_data;
+	unsigned long flags;
+	int count;
+
+	spin_lock_irqsave(&bc->lock, flags);
+	count = CIRC_SPACE(bc->head, bc->tail, BUF_SIZE);
+	spin_unlock_irqrestore(&bc->lock, flags);
+
+	return count;
+}
+
+/*
+ * Stop sending data to the tty layer
+ *
+ * This function is called when the tty layer's input buffers are getting full,
+ * so the driver should stop sending it data.  The easiest way to do this is to
+ * disable the RX IRQ, which will prevent ehv_bc_tty_rx_isr() from being
+ * called.
+ *
+ * The hypervisor will continue to queue up any incoming data.  If there is any
+ * data in the queue when the RX interrupt is enabled, we'll immediately get an
+ * RX interrupt.
+ */
+static void ehv_bc_tty_throttle(struct tty_struct *ttys)
+{
+	struct ehv_bc_data *bc = ttys->driver_data;
+
+	disable_irq(bc->rx_irq);
+}
+
+/*
+ * Resume sending data to the tty layer
+ *
+ * This function is called after previously calling ehv_bc_tty_throttle().  The
+ * tty layer's input buffers now have more room, so the driver can resume
+ * sending it data.
+ */
+static void ehv_bc_tty_unthrottle(struct tty_struct *ttys)
+{
+	struct ehv_bc_data *bc = ttys->driver_data;
+
+	/* If there is any data in the queue when the RX interrupt is enabled,
+	 * we'll immediately get an RX interrupt.
+	 */
+	enable_irq(bc->rx_irq);
+}
+
+static void ehv_bc_tty_hangup(struct tty_struct *ttys)
+{
+	struct ehv_bc_data *bc = ttys->driver_data;
+
+	ehv_bc_tx_dequeue(bc);
+	tty_port_hangup(&bc->port);
+}
+
+/*
+ * TTY driver operations
+ *
+ * If we could ask the hypervisor how much data is still in the TX buffer, or
+ * at least how big the TX buffers are, then we could implement the
+ * .wait_until_sent and .chars_in_buffer functions.
+ */
+static const struct tty_operations ehv_bc_ops = {
+	.open		= ehv_bc_tty_open,
+	.close		= ehv_bc_tty_close,
+	.write		= ehv_bc_tty_write,
+	.write_room	= ehv_bc_tty_write_room,
+	.throttle	= ehv_bc_tty_throttle,
+	.unthrottle	= ehv_bc_tty_unthrottle,
+	.hangup		= ehv_bc_tty_hangup,
+};
+
+/*
+ * initialize the TTY port
+ *
+ * This function will only be called once, no matter how many times
+ * ehv_bc_tty_open() is called.  That's why we register the ISR here, and also
+ * why we initialize tty_struct-related variables here.
+ */
+static int ehv_bc_tty_port_activate(struct tty_port *port,
+				    struct tty_struct *ttys)
+{
+	struct ehv_bc_data *bc = container_of(port, struct ehv_bc_data, port);
+	int ret;
+
+	ttys->driver_data = bc;
+
+	ret = request_irq(bc->rx_irq, ehv_bc_tty_rx_isr, 0, "ehv-bc", bc);
+	if (ret < 0) {
+		dev_err(bc->dev, "could not request rx irq %u (ret=%i)\n",
+		       bc->rx_irq, ret);
+		return ret;
+	}
+
+	/* request_irq also enables the IRQ */
+	bc->tx_irq_enabled = 1;
+
+	ret = request_irq(bc->tx_irq, ehv_bc_tty_tx_isr, 0, "ehv-bc", bc);
+	if (ret < 0) {
+		dev_err(bc->dev, "could not request tx irq %u (ret=%i)\n",
+		       bc->tx_irq, ret);
+		free_irq(bc->rx_irq, bc);
+		return ret;
+	}
+
+	/* The TX IRQ is enabled only when we can't write all the data to the
+	 * byte channel at once, so by default it's disabled.
+	 */
+	disable_tx_interrupt(bc);
+
+	return 0;
+}
+
+static void ehv_bc_tty_port_shutdown(struct tty_port *port)
+{
+	struct ehv_bc_data *bc = container_of(port, struct ehv_bc_data, port);
+
+	free_irq(bc->tx_irq, bc);
+	free_irq(bc->rx_irq, bc);
+}
+
+static const struct tty_port_operations ehv_bc_tty_port_ops = {
+	.activate = ehv_bc_tty_port_activate,
+	.shutdown = ehv_bc_tty_port_shutdown,
+};
+
+static int __devinit ehv_bc_tty_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	struct ehv_bc_data *bc;
+	const uint32_t *iprop;
+	unsigned int handle;
+	int ret;
+	static unsigned int index = 1;
+	unsigned int i;
+
+	iprop = of_get_property(np, "hv-handle", NULL);
+	if (!iprop) {
+		dev_err(&pdev->dev, "no 'hv-handle' property in %s node\n",
+			np->name);
+		return -ENODEV;
+	}
+
+	/* We already told the console layer that the index for the console
+	 * device is zero, so we need to make sure that we use that index when
+	 * we probe the console byte channel node.
+	 */
+	handle = be32_to_cpu(*iprop);
+	i = (handle == stdout_bc) ? 0 : index++;
+	bc = &bcs[i];
+
+	bc->handle = handle;
+	bc->head = 0;
+	bc->tail = 0;
+	spin_lock_init(&bc->lock);
+
+	bc->rx_irq = irq_of_parse_and_map(np, 0);
+	bc->tx_irq = irq_of_parse_and_map(np, 1);
+	if ((bc->rx_irq == NO_IRQ) || (bc->tx_irq == NO_IRQ)) {
+		dev_err(&pdev->dev, "no 'interrupts' property in %s node\n",
+			np->name);
+		ret = -ENODEV;
+		goto error;
+	}
+
+	bc->dev = tty_register_device(ehv_bc_driver, i, &pdev->dev);
+	if (IS_ERR(bc->dev)) {
+		ret = PTR_ERR(bc->dev);
+		dev_err(&pdev->dev, "could not register tty (ret=%i)\n", ret);
+		goto error;
+	}
+
+	tty_port_init(&bc->port);
+	bc->port.ops = &ehv_bc_tty_port_ops;
+
+	dev_set_drvdata(&pdev->dev, bc);
+
+	dev_info(&pdev->dev, "registered /dev/%s%u for byte channel %u\n",
+		ehv_bc_driver->name, i, bc->handle);
+
+	return 0;
+
+error:
+	irq_dispose_mapping(bc->tx_irq);
+	irq_dispose_mapping(bc->rx_irq);
+
+	memset(bc, 0, sizeof(struct ehv_bc_data));
+	return ret;
+}
+
+static int ehv_bc_tty_remove(struct platform_device *pdev)
+{
+	struct ehv_bc_data *bc = dev_get_drvdata(&pdev->dev);
+
+	tty_unregister_device(ehv_bc_driver, bc - bcs);
+
+	irq_dispose_mapping(bc->tx_irq);
+	irq_dispose_mapping(bc->rx_irq);
+
+	return 0;
+}
+
+static const struct of_device_id ehv_bc_tty_of_ids[] = {
+	{ .compatible = "epapr,hv-byte-channel" },
+	{}
+};
+
+static struct platform_driver ehv_bc_tty_driver = {
+	.driver = {
+		.owner = THIS_MODULE,
+		.name = "ehv-bc",
+		.of_match_table = ehv_bc_tty_of_ids,
+	},
+	.probe		= ehv_bc_tty_probe,
+	.remove		= ehv_bc_tty_remove,
+};
+
+/**
+ * ehv_bc_init - ePAPR hypervisor byte channel driver initialization
+ *
+ * This function is called when this module is loaded.
+ */
+static int __init ehv_bc_init(void)
+{
+	struct device_node *np;
+	unsigned int count = 0; /* Number of elements in bcs[] */
+	int ret;
+
+	pr_info("ePAPR hypervisor byte channel driver\n");
+
+	/* Count the number of byte channels */
+	for_each_compatible_node(np, NULL, "epapr,hv-byte-channel")
+		count++;
+
+	if (!count)
+		return -ENODEV;
+
+	/* The array index of an element in bcs[] is the same as the tty index
+	 * for that element.  If you know the address of an element in the
+	 * array, then you can use pointer math (e.g. "bc - bcs") to get its
+	 * tty index.
+	 */
+	bcs = kzalloc(count * sizeof(struct ehv_bc_data), GFP_KERNEL);
+	if (!bcs)
+		return -ENOMEM;
+
+	ehv_bc_driver = alloc_tty_driver(count);
+	if (!ehv_bc_driver) {
+		ret = -ENOMEM;
+		goto error;
+	}
+
+	ehv_bc_driver->owner = THIS_MODULE;
+	ehv_bc_driver->driver_name = "ehv-bc";
+	ehv_bc_driver->name = ehv_bc_console.name;
+	ehv_bc_driver->type = TTY_DRIVER_TYPE_CONSOLE;
+	ehv_bc_driver->subtype = SYSTEM_TYPE_CONSOLE;
+	ehv_bc_driver->init_termios = tty_std_termios;
+	ehv_bc_driver->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_DYNAMIC_DEV;
+	tty_set_operations(ehv_bc_driver, &ehv_bc_ops);
+
+	ret = tty_register_driver(ehv_bc_driver);
+	if (ret) {
+		pr_err("ehv-bc: could not register tty driver (ret=%i)\n", ret);
+		goto error;
+	}
+
+	ret = platform_driver_register(&ehv_bc_tty_driver);
+	if (ret) {
+		pr_err("ehv-bc: could not register platform driver (ret=%i)\n",
+		       ret);
+		goto error;
+	}
+
+	return 0;
+
+error:
+	if (ehv_bc_driver) {
+		tty_unregister_driver(ehv_bc_driver);
+		put_tty_driver(ehv_bc_driver);
+	}
+
+	kfree(bcs);
+
+	return ret;
+}
+
+
+/**
+ * ehv_bc_exit - ePAPR hypervisor byte channel driver termination
+ *
+ * This function is called when this driver is unloaded.
+ */
+static void __exit ehv_bc_exit(void)
+{
+	tty_unregister_driver(ehv_bc_driver);
+	put_tty_driver(ehv_bc_driver);
+	kfree(bcs);
+}
+
+module_init(ehv_bc_init);
+module_exit(ehv_bc_exit);
+
+MODULE_AUTHOR("Timur Tabi <timur@freescale.com>");
+MODULE_DESCRIPTION("ePAPR hypervisor byte channel driver");
+MODULE_LICENSE("GPL v2");

drivers/tty/hvc/hvc_console.c

@@ -388,7 +388,7 @@ static void hvc_close(struct tty_struct *tty, struct file * filp)
 		 * there is no buffered data otherwise sleeps on a wait queue
 		 * waking periodically to check chars_in_buffer().
 		 */
-		tty_wait_until_sent(tty, HVC_CLOSE_WAIT);
+		tty_wait_until_sent_from_close(tty, HVC_CLOSE_WAIT);
 	} else {
 		if (hp->count < 0)
 			printk(KERN_ERR "hvc_close %X: oops, count is %d\n",
@@ -852,7 +852,7 @@ struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
 	 * find index to use:
 	 * see if this vterm id matches one registered for console.
 	 */
-	for (i=0; i < MAX_NR_HVC_CONSOLES; i++)
+	for (i = 0; i < MAX_NR_HVC_CONSOLES; i++)
 		if (vtermnos[i] == hp->vtermno &&
 		    cons_ops[i] == hp->ops)
 			break;
@@ -862,9 +862,13 @@ struct hvc_struct *hvc_alloc(uint32_t vtermno, int data,
 		i = ++last_hvc;
 
 	hp->index = i;
+	hvc_console.index = i;
+	vtermnos[i] = vtermno;
+	cons_ops[i] = ops;
 
 	list_add_tail(&(hp->next), &hvc_structs);
 	spin_unlock(&hvc_structs_lock);
+	register_console(&hvc_console);
 
 	return hp;
 }
@@ -875,6 +879,7 @@ int hvc_remove(struct hvc_struct *hp)
 	unsigned long flags;
 	struct tty_struct *tty;
 
+	unregister_console(&hvc_console);
 	spin_lock_irqsave(&hp->lock, flags);
 	tty = tty_kref_get(hp->tty);
 

drivers/tty/hvc/hvc_irq.c

@@ -28,7 +28,7 @@ int notifier_add_irq(struct hvc_struct *hp, int irq)
 		hp->irq_requested = 0;
 		return 0;
 	}
-	rc = request_irq(irq, hvc_handle_interrupt, IRQF_DISABLED,
+	rc = request_irq(irq, hvc_handle_interrupt, 0,
 			   "hvc_console", hp);
 	if (!rc)
 		hp->irq_requested = 1;

drivers/tty/hvc/hvcs.c

@@ -1057,7 +1057,7 @@ static int hvcs_enable_device(struct hvcs_struct *hvcsd, uint32_t unit_address,
 	 * the conn was registered and now.
 	 */
 	if (!(rc = request_irq(irq, &hvcs_handle_interrupt,
-				IRQF_DISABLED, "ibmhvcs", hvcsd))) {
+				0, "ibmhvcs", hvcsd))) {
 		/*
 		 * It is possible the vty-server was removed after the irq was
 		 * requested but before we have time to enable interrupts.
@@ -1237,7 +1237,7 @@ static void hvcs_close(struct tty_struct *tty, struct file *filp)
 		irq = hvcsd->vdev->irq;
 		spin_unlock_irqrestore(&hvcsd->lock, flags);
 
-		tty_wait_until_sent(tty, HVCS_CLOSE_WAIT);
+		tty_wait_until_sent_from_close(tty, HVCS_CLOSE_WAIT);
 
 		/*
 		 * This line is important because it tells hvcs_open that this

drivers/tty/hvc/hvsi.c

@@ -1105,7 +1105,7 @@ static int __init hvsi_init(void)
 		struct hvsi_struct *hp = &hvsi_ports[i];
 		int ret = 1;
 
-		ret = request_irq(hp->virq, hvsi_interrupt, IRQF_DISABLED, "hvsi", hp);
+		ret = request_irq(hp->virq, hvsi_interrupt, 0, "hvsi", hp);
 		if (ret)
 			printk(KERN_ERR "HVSI: couldn't reserve irq 0x%x (error %i)\n",
 				hp->virq, ret);

drivers/tty/isicom.c

@@ -1598,7 +1598,7 @@ static int __devinit isicom_probe(struct pci_dev *pdev,
 	}
 
 	retval = request_irq(board->irq, isicom_interrupt,
-			IRQF_SHARED | IRQF_DISABLED, ISICOM_NAME, board);
+			IRQF_SHARED, ISICOM_NAME, board);
 	if (retval < 0) {
 		dev_err(&pdev->dev, "Could not install handler at Irq %d. "
 			"Card%d will be disabled.\n", board->irq, index + 1);

drivers/tty/mxser.c

@@ -2005,16 +2005,9 @@ static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
 	 */
 	if (!timeout || timeout > 2 * info->timeout)
 		timeout = 2 * info->timeout;
-#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
-	printk(KERN_DEBUG "In rs_wait_until_sent(%d) check=%lu...",
-		timeout, char_time);
-	printk("jiff=%lu...", jiffies);
-#endif
+
 	spin_lock_irqsave(&info->slock, flags);
 	while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
-#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
-		printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
-#endif
 		spin_unlock_irqrestore(&info->slock, flags);
 		schedule_timeout_interruptible(char_time);
 		spin_lock_irqsave(&info->slock, flags);
@@ -2025,10 +2018,6 @@ static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
 	}
 	spin_unlock_irqrestore(&info->slock, flags);
 	set_current_state(TASK_RUNNING);
-
-#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
-	printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
-#endif
 }
 
 /*

drivers/tty/n_gsm.c

@@ -21,7 +21,6 @@
  *	Mostly done:	ioctls for setting modes/timing
  *	Partly done:	hooks so you can pull off frames to non tty devs
  *	Restart DLCI 0 when it closes ?
- *	Test basic encoding
  *	Improve the tx engine
  *	Resolve tx side locking by adding a queue_head and routing
  *		all control traffic via it
@@ -810,38 +809,41 @@ static int gsm_dlci_data_output(struct gsm_mux *gsm, struct gsm_dlci *dlci)
 {
 	struct gsm_msg *msg;
 	u8 *dp;
-	int len, size;
+	int len, total_size, size;
 	int h = dlci->adaption - 1;
 
-	len = kfifo_len(dlci->fifo);
-	if (len == 0)
-		return 0;
-
-	/* MTU/MRU count only the data bits */
-	if (len > gsm->mtu)
-		len = gsm->mtu;
-
-	size = len + h;
-
-	msg = gsm_data_alloc(gsm, dlci->addr, size, gsm->ftype);
-	/* FIXME: need a timer or something to kick this so it can't
-	   get stuck with no work outstanding and no buffer free */
-	if (msg == NULL)
-		return -ENOMEM;
-	dp = msg->data;
-	switch (dlci->adaption) {
-	case 1:	/* Unstructured */
-		break;
-	case 2:	/* Unstructed with modem bits. Always one byte as we never
-		   send inline break data */
-		*dp += gsm_encode_modem(dlci);
-		len--;
-		break;
+	total_size = 0;
+	while(1) {
+		len = kfifo_len(dlci->fifo);
+		if (len == 0)
+			return total_size;
+
+		/* MTU/MRU count only the data bits */
+		if (len > gsm->mtu)
+			len = gsm->mtu;
+
+		size = len + h;
+
+		msg = gsm_data_alloc(gsm, dlci->addr, size, gsm->ftype);
+		/* FIXME: need a timer or something to kick this so it can't
+		   get stuck with no work outstanding and no buffer free */
+		if (msg == NULL)
+			return -ENOMEM;
+		dp = msg->data;
+		switch (dlci->adaption) {
+		case 1:	/* Unstructured */
+			break;
+		case 2:	/* Unstructed with modem bits. Always one byte as we never
+			   send inline break data */
+			*dp++ = gsm_encode_modem(dlci);
+			break;
+		}
+		WARN_ON(kfifo_out_locked(dlci->fifo, dp , len, &dlci->lock) != len);
+		__gsm_data_queue(dlci, msg);
+		total_size += size;
 	}
-	WARN_ON(kfifo_out_locked(dlci->fifo, dp , len, &dlci->lock) != len);
-	__gsm_data_queue(dlci, msg);
 	/* Bytes of data we used up */
-	return size;
+	return total_size;
 }
 
 /**
@@ -2004,6 +2006,7 @@ void gsm_cleanup_mux(struct gsm_mux *gsm)
 	int i;
 	struct gsm_dlci *dlci = gsm->dlci[0];
 	struct gsm_msg *txq;
+	struct gsm_control *gc;
 
 	gsm->dead = 1;
 
@@ -2017,6 +2020,13 @@ void gsm_cleanup_mux(struct gsm_mux *gsm)
 	spin_unlock(&gsm_mux_lock);
 	WARN_ON(i == MAX_MUX);
 
+	/* In theory disconnecting DLCI 0 is sufficient but for some
+	   modems this is apparently not the case. */
+	if (dlci) {
+		gc = gsm_control_send(gsm, CMD_CLD, NULL, 0);
+		if (gc)
+			gsm_control_wait(gsm, gc);
+	}
 	del_timer_sync(&gsm->t2_timer);
 	/* Now we are sure T2 has stopped */
 	if (dlci) {
@@ -2982,7 +2992,7 @@ static int gsmtty_tiocmset(struct tty_struct *tty,
 	struct gsm_dlci *dlci = tty->driver_data;
 	unsigned int modem_tx = dlci->modem_tx;
 
-	modem_tx &= clear;
+	modem_tx &= ~clear;
 	modem_tx |= set;
 
 	if (modem_tx != dlci->modem_tx) {

drivers/tty/pty.c

@@ -670,12 +670,18 @@ static int ptmx_open(struct inode *inode, struct file *filp)
 
 	nonseekable_open(inode, filp);
 
+	retval = tty_alloc_file(filp);
+	if (retval)
+		return retval;
+
 	/* find a device that is not in use. */
 	tty_lock();
 	index = devpts_new_index(inode);
 	tty_unlock();
-	if (index < 0)
-		return index;
+	if (index < 0) {
+		retval = index;
+		goto err_file;
+	}
 
 	mutex_lock(&tty_mutex);
 	tty_lock();
@@ -689,27 +695,27 @@ static int ptmx_open(struct inode *inode, struct file *filp)
 
 	set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */
 
-	retval = tty_add_file(tty, filp);
-	if (retval)
-		goto out;
+	tty_add_file(tty, filp);
 
 	retval = devpts_pty_new(inode, tty->link);
 	if (retval)
-		goto out1;
+		goto err_release;
 
 	retval = ptm_driver->ops->open(tty, filp);
 	if (retval)
-		goto out2;
-out1:
+		goto err_release;
+
 	tty_unlock();
-	return retval;
-out2:
+	return 0;
+err_release:
 	tty_unlock();
 	tty_release(inode, filp);
 	return retval;
 out:
 	devpts_kill_index(inode, index);
 	tty_unlock();
+err_file:
+	tty_free_file(filp);
 	return retval;
 }
 

drivers/tty/serial/68328serial.c

@@ -235,22 +235,6 @@ static void batten_down_hatches(void)
 
 static void status_handle(struct m68k_serial *info, unsigned short status)
 {
-#if 0
-	if(status & DCD) {
-		if((info->port.tty->termios->c_cflag & CRTSCTS) &&
-		   ((info->curregs[3] & AUTO_ENAB)==0)) {
-			info->curregs[3] |= AUTO_ENAB;
-			info->pendregs[3] |= AUTO_ENAB;
-			write_zsreg(info->m68k_channel, 3, info->curregs[3]);
-		}
-	} else {
-		if((info->curregs[3] & AUTO_ENAB)) {
-			info->curregs[3] &= ~AUTO_ENAB;
-			info->pendregs[3] &= ~AUTO_ENAB;
-			write_zsreg(info->m68k_channel, 3, info->curregs[3]);
-		}
-	}
-#endif
 	/* If this is console input and this is a
 	 * 'break asserted' status change interrupt
 	 * see if we can drop into the debugger
@@ -340,9 +324,6 @@ static void transmit_chars(struct m68k_serial *info)
 	info->xmit_tail = info->xmit_tail & (SERIAL_XMIT_SIZE-1);
 	info->xmit_cnt--;
 
-	if (info->xmit_cnt < WAKEUP_CHARS)
-		schedule_work(&info->tqueue);
-
 	if(info->xmit_cnt <= 0) {
 		/* All done for now... TX ints off */
 		uart->ustcnt &= ~USTCNT_TX_INTR_MASK;
@@ -378,21 +359,6 @@ irqreturn_t rs_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static void do_softint(struct work_struct *work)
-{
-	struct m68k_serial	*info = container_of(work, struct m68k_serial, tqueue);
-	struct tty_struct	*tty;
-	
-	tty = info->tty;
-	if (!tty)
-		return;
-#if 0
-	if (clear_bit(RS_EVENT_WRITE_WAKEUP, &info->event)) {
-		tty_wakeup(tty);
-	}
-#endif   
-}
-
 static int startup(struct m68k_serial * info)
 {
 	m68328_uart *uart = &uart_addr[info->line];
@@ -1324,7 +1290,6 @@ rs68328_init(void)
 	    info->event = 0;
 	    info->count = 0;
 	    info->blocked_open = 0;
-	    INIT_WORK(&info->tqueue, do_softint);
 	    init_waitqueue_head(&info->open_wait);
 	    init_waitqueue_head(&info->close_wait);
 	    info->line = i;
@@ -1341,7 +1306,7 @@ rs68328_init(void)
 
 	    if (request_irq(uart_irqs[i],
 			    rs_interrupt,
-			    IRQF_DISABLED,
+			    0,
 			    "M68328_UART", info))
                 panic("Unable to attach 68328 serial interrupt\n");
 	}

drivers/tty/serial/68328serial.h

@@ -158,7 +158,6 @@ struct m68k_serial {
 	int			xmit_head;
 	int			xmit_tail;
 	int			xmit_cnt;
-	struct work_struct	tqueue;
 	wait_queue_head_t	open_wait;
 	wait_queue_head_t	close_wait;
 };

drivers/tty/serial/8250.c

@@ -309,6 +309,13 @@ static const struct serial8250_config uart_config[] = {
 				  UART_FCR_T_TRIG_01,
 		.flags		= UART_CAP_FIFO | UART_CAP_RTOIE,
 	},
+	[PORT_XR17D15X] = {
+		.name		= "XR17D15X",
+		.fifo_size	= 64,
+		.tx_loadsz	= 64,
+		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
+		.flags		= UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR,
+	},
 };
 
 #if defined(CONFIG_MIPS_ALCHEMY)
@@ -461,42 +468,6 @@ static void tsi_serial_out(struct uart_port *p, int offset, int value)
 		writeb(value, p->membase + offset);
 }
 
-/* Save the LCR value so it can be re-written when a Busy Detect IRQ occurs. */
-static inline void dwapb_save_out_value(struct uart_port *p, int offset,
-					int value)
-{
-	struct uart_8250_port *up =
-		container_of(p, struct uart_8250_port, port);
-
-	if (offset == UART_LCR)
-		up->lcr = value;
-}
-
-/* Read the IER to ensure any interrupt is cleared before returning from ISR. */
-static inline void dwapb_check_clear_ier(struct uart_port *p, int offset)
-{
-	if (offset == UART_TX || offset == UART_IER)
-		p->serial_in(p, UART_IER);
-}
-
-static void dwapb_serial_out(struct uart_port *p, int offset, int value)
-{
-	int save_offset = offset;
-	offset = map_8250_out_reg(p, offset) << p->regshift;
-	dwapb_save_out_value(p, save_offset, value);
-	writeb(value, p->membase + offset);
-	dwapb_check_clear_ier(p, save_offset);
-}
-
-static void dwapb32_serial_out(struct uart_port *p, int offset, int value)
-{
-	int save_offset = offset;
-	offset = map_8250_out_reg(p, offset) << p->regshift;
-	dwapb_save_out_value(p, save_offset, value);
-	writel(value, p->membase + offset);
-	dwapb_check_clear_ier(p, save_offset);
-}
-
 static unsigned int io_serial_in(struct uart_port *p, int offset)
 {
 	offset = map_8250_in_reg(p, offset) << p->regshift;
@@ -509,6 +480,8 @@ static void io_serial_out(struct uart_port *p, int offset, int value)
 	outb(value, p->iobase + offset);
 }
 
+static int serial8250_default_handle_irq(struct uart_port *port);
+
 static void set_io_from_upio(struct uart_port *p)
 {
 	struct uart_8250_port *up =
@@ -540,16 +513,6 @@ static void set_io_from_upio(struct uart_port *p)
 		p->serial_out = tsi_serial_out;
 		break;
 
-	case UPIO_DWAPB:
-		p->serial_in = mem_serial_in;
-		p->serial_out = dwapb_serial_out;
-		break;
-
-	case UPIO_DWAPB32:
-		p->serial_in = mem32_serial_in;
-		p->serial_out = dwapb32_serial_out;
-		break;
-
 	default:
 		p->serial_in = io_serial_in;
 		p->serial_out = io_serial_out;
@@ -557,6 +520,7 @@ static void set_io_from_upio(struct uart_port *p)
 	}
 	/* Remember loaded iotype */
 	up->cur_iotype = p->iotype;
+	p->handle_irq = serial8250_default_handle_irq;
 }
 
 static void
@@ -567,8 +531,6 @@ serial_out_sync(struct uart_8250_port *up, int offset, int value)
 	case UPIO_MEM:
 	case UPIO_MEM32:
 	case UPIO_AU:
-	case UPIO_DWAPB:
-	case UPIO_DWAPB32:
 		p->serial_out(p, offset, value);
 		p->serial_in(p, UART_LCR);	/* safe, no side-effects */
 		break;
@@ -1119,6 +1081,14 @@ static void autoconfig_16550a(struct uart_8250_port *up)
 	}
 	serial_outp(up, UART_IER, iersave);
 
+	/*
+	 * Exar uarts have EFR in a weird location
+	 */
+	if (up->port.flags & UPF_EXAR_EFR) {
+		up->port.type = PORT_XR17D15X;
+		up->capabilities |= UART_CAP_AFE | UART_CAP_EFR;
+	}
+
 	/*
 	 * We distinguish between 16550A and U6 16550A by counting
 	 * how many bytes are in the FIFO.
@@ -1621,6 +1591,29 @@ static void serial8250_handle_port(struct uart_8250_port *up)
 	spin_unlock_irqrestore(&up->port.lock, flags);
 }
 
+int serial8250_handle_irq(struct uart_port *port, unsigned int iir)
+{
+	struct uart_8250_port *up =
+		container_of(port, struct uart_8250_port, port);
+
+	if (!(iir & UART_IIR_NO_INT)) {
+		serial8250_handle_port(up);
+		return 1;
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(serial8250_handle_irq);
+
+static int serial8250_default_handle_irq(struct uart_port *port)
+{
+	struct uart_8250_port *up =
+		container_of(port, struct uart_8250_port, port);
+	unsigned int iir = serial_in(up, UART_IIR);
+
+	return serial8250_handle_irq(port, iir);
+}
+
 /*
  * This is the serial driver's interrupt routine.
  *
@@ -1648,30 +1641,13 @@ static irqreturn_t serial8250_interrupt(int irq, void *dev_id)
 	l = i->head;
 	do {
 		struct uart_8250_port *up;
-		unsigned int iir;
+		struct uart_port *port;
 
 		up = list_entry(l, struct uart_8250_port, list);
+		port = &up->port;
 
-		iir = serial_in(up, UART_IIR);
-		if (!(iir & UART_IIR_NO_INT)) {
-			serial8250_handle_port(up);
-
+		if (port->handle_irq(port)) {
 			handled = 1;
-
-			end = NULL;
-		} else if ((up->port.iotype == UPIO_DWAPB ||
-			    up->port.iotype == UPIO_DWAPB32) &&
-			  (iir & UART_IIR_BUSY) == UART_IIR_BUSY) {
-			/* The DesignWare APB UART has an Busy Detect (0x07)
-			 * interrupt meaning an LCR write attempt occurred while the
-			 * UART was busy. The interrupt must be cleared by reading
-			 * the UART status register (USR) and the LCR re-written. */
-			unsigned int status;
-			status = *(volatile u32 *)up->port.private_data;
-			serial_out(up, UART_LCR, up->lcr);
-
-			handled = 1;
-
 			end = NULL;
 		} else if (end == NULL)
 			end = l;
@@ -2081,8 +2057,8 @@ static int serial8250_startup(struct uart_port *port)
 	 */
 	if (!(up->port.flags & UPF_BUGGY_UART) &&
 	    (serial_inp(up, UART_LSR) == 0xff)) {
-		printk(KERN_INFO "ttyS%d: LSR safety check engaged!\n",
-		       serial_index(&up->port));
+		printk_ratelimited(KERN_INFO "ttyS%d: LSR safety check engaged!\n",
+				   serial_index(&up->port));
 		return -ENODEV;
 	}
 
@@ -2458,7 +2434,10 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
 			efr |= UART_EFR_CTS;
 
 		serial_outp(up, UART_LCR, UART_LCR_CONF_MODE_B);
-		serial_outp(up, UART_EFR, efr);
+		if (up->port.flags & UPF_EXAR_EFR)
+			serial_outp(up, UART_XR_EFR, efr);
+		else
+			serial_outp(up, UART_EFR, efr);
 	}
 
 #ifdef CONFIG_ARCH_OMAP
@@ -2570,8 +2549,6 @@ static int serial8250_request_std_resource(struct uart_8250_port *up)
 	case UPIO_TSI:
 	case UPIO_MEM32:
 	case UPIO_MEM:
-	case UPIO_DWAPB:
-	case UPIO_DWAPB32:
 		if (!up->port.mapbase)
 			break;
 
@@ -2608,8 +2585,6 @@ static void serial8250_release_std_resource(struct uart_8250_port *up)
 	case UPIO_TSI:
 	case UPIO_MEM32:
 	case UPIO_MEM:
-	case UPIO_DWAPB:
-	case UPIO_DWAPB32:
 		if (!up->port.mapbase)
 			break;
 
@@ -3050,6 +3025,10 @@ int __init early_serial_setup(struct uart_port *port)
 		p->serial_in = port->serial_in;
 	if (port->serial_out)
 		p->serial_out = port->serial_out;
+	if (port->handle_irq)
+		p->handle_irq = port->handle_irq;
+	else
+		p->handle_irq = serial8250_default_handle_irq;
 
 	return 0;
 }
@@ -3118,6 +3097,7 @@ static int __devinit serial8250_probe(struct platform_device *dev)
 		port.type		= p->type;
 		port.serial_in		= p->serial_in;
 		port.serial_out		= p->serial_out;
+		port.handle_irq		= p->handle_irq;
 		port.set_termios	= p->set_termios;
 		port.pm			= p->pm;
 		port.dev		= &dev->dev;
@@ -3283,6 +3263,8 @@ int serial8250_register_port(struct uart_port *port)
 			uart->port.serial_in = port->serial_in;
 		if (port->serial_out)
 			uart->port.serial_out = port->serial_out;
+		if (port->handle_irq)
+			uart->port.handle_irq = port->handle_irq;
 		/*  Possibly override set_termios call */
 		if (port->set_termios)
 			uart->port.set_termios = port->set_termios;

drivers/tty/serial/8250_dw.c

@@ -0,0 +1,194 @@
+/*
+ * Synopsys DesignWare 8250 driver.
+ *
+ * Copyright 2011 Picochip, Jamie Iles.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * The Synopsys DesignWare 8250 has an extra feature whereby it detects if the
+ * LCR is written whilst busy.  If it is, then a busy detect interrupt is
+ * raised, the LCR needs to be rewritten and the uart status register read.
+ */
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/serial_8250.h>
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+struct dw8250_data {
+	int	last_lcr;
+	int	line;
+};
+
+static void dw8250_serial_out(struct uart_port *p, int offset, int value)
+{
+	struct dw8250_data *d = p->private_data;
+
+	if (offset == UART_LCR)
+		d->last_lcr = value;
+
+	offset <<= p->regshift;
+	writeb(value, p->membase + offset);
+}
+
+static unsigned int dw8250_serial_in(struct uart_port *p, int offset)
+{
+	offset <<= p->regshift;
+
+	return readb(p->membase + offset);
+}
+
+static void dw8250_serial_out32(struct uart_port *p, int offset, int value)
+{
+	struct dw8250_data *d = p->private_data;
+
+	if (offset == UART_LCR)
+		d->last_lcr = value;
+
+	offset <<= p->regshift;
+	writel(value, p->membase + offset);
+}
+
+static unsigned int dw8250_serial_in32(struct uart_port *p, int offset)
+{
+	offset <<= p->regshift;
+
+	return readl(p->membase + offset);
+}
+
+/* Offset for the DesignWare's UART Status Register. */
+#define UART_USR	0x1f
+
+static int dw8250_handle_irq(struct uart_port *p)
+{
+	struct dw8250_data *d = p->private_data;
+	unsigned int iir = p->serial_in(p, UART_IIR);
+
+	if (serial8250_handle_irq(p, iir)) {
+		return 1;
+	} else if ((iir & UART_IIR_BUSY) == UART_IIR_BUSY) {
+		/* Clear the USR and write the LCR again. */
+		(void)p->serial_in(p, UART_USR);
+		p->serial_out(p, d->last_lcr, UART_LCR);
+
+		return 1;
+	}
+
+	return 0;
+}
+
+static int __devinit dw8250_probe(struct platform_device *pdev)
+{
+	struct uart_port port = {};
+	struct resource *regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	struct resource *irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+	struct device_node *np = pdev->dev.of_node;
+	u32 val;
+	struct dw8250_data *data;
+
+	if (!regs || !irq) {
+		dev_err(&pdev->dev, "no registers/irq defined\n");
+		return -EINVAL;
+	}
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+	port.private_data = data;
+
+	spin_lock_init(&port.lock);
+	port.mapbase = regs->start;
+	port.irq = irq->start;
+	port.handle_irq = dw8250_handle_irq;
+	port.type = PORT_8250;
+	port.flags = UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF | UPF_IOREMAP |
+		UPF_FIXED_PORT | UPF_FIXED_TYPE;
+	port.dev = &pdev->dev;
+
+	port.iotype = UPIO_MEM;
+	port.serial_in = dw8250_serial_in;
+	port.serial_out = dw8250_serial_out;
+	if (!of_property_read_u32(np, "reg-io-width", &val)) {
+		switch (val) {
+		case 1:
+			break;
+		case 4:
+			port.iotype = UPIO_MEM32;
+			port.serial_in = dw8250_serial_in32;
+			port.serial_out = dw8250_serial_out32;
+			break;
+		default:
+			dev_err(&pdev->dev, "unsupported reg-io-width (%u)\n",
+				val);
+			return -EINVAL;
+		}
+	}
+
+	if (!of_property_read_u32(np, "reg-shift", &val))
+		port.regshift = val;
+
+	if (of_property_read_u32(np, "clock-frequency", &val)) {
+		dev_err(&pdev->dev, "no clock-frequency property set\n");
+		return -EINVAL;
+	}
+	port.uartclk = val;
+
+	data->line = serial8250_register_port(&port);
+	if (data->line < 0)
+		return data->line;
+
+	platform_set_drvdata(pdev, data);
+
+	return 0;
+}
+
+static int __devexit dw8250_remove(struct platform_device *pdev)
+{
+	struct dw8250_data *data = platform_get_drvdata(pdev);
+
+	serial8250_unregister_port(data->line);
+
+	return 0;
+}
+
+static const struct of_device_id dw8250_match[] = {
+	{ .compatible = "snps,dw-apb-uart" },
+	{ /* Sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, dw8250_match);
+
+static struct platform_driver dw8250_platform_driver = {
+	.driver = {
+		.name		= "dw-apb-uart",
+		.owner		= THIS_MODULE,
+		.of_match_table	= dw8250_match,
+	},
+	.probe			= dw8250_probe,
+	.remove			= __devexit_p(dw8250_remove),
+};
+
+static int __init dw8250_init(void)
+{
+	return platform_driver_register(&dw8250_platform_driver);
+}
+module_init(dw8250_init);
+
+static void __exit dw8250_exit(void)
+{
+	platform_driver_unregister(&dw8250_platform_driver);
+}
+module_exit(dw8250_exit);
+
+MODULE_AUTHOR("Jamie Iles");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Synopsys DesignWare 8250 serial port driver");

drivers/tty/serial/8250_pci.c

@@ -1101,6 +1101,15 @@ static int pci_eg20t_init(struct pci_dev *dev)
 #endif
 }
 
+static int
+pci_xr17c154_setup(struct serial_private *priv,
+		  const struct pciserial_board *board,
+		  struct uart_port *port, int idx)
+{
+	port->flags |= UPF_EXAR_EFR;
+	return pci_default_setup(priv, board, port, idx);
+}
+
 /* This should be in linux/pci_ids.h */
 #define PCI_VENDOR_ID_SBSMODULARIO	0x124B
 #define PCI_SUBVENDOR_ID_SBSMODULARIO	0x124B
@@ -1505,6 +1514,30 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
 		.subdevice	= PCI_ANY_ID,
 		.setup		= pci_timedia_setup,
 	},
+	/*
+	 * Exar cards
+	 */
+	{
+		.vendor = PCI_VENDOR_ID_EXAR,
+		.device = PCI_DEVICE_ID_EXAR_XR17C152,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
+		.setup		= pci_xr17c154_setup,
+	},
+	{
+		.vendor = PCI_VENDOR_ID_EXAR,
+		.device = PCI_DEVICE_ID_EXAR_XR17C154,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
+		.setup		= pci_xr17c154_setup,
+	},
+	{
+		.vendor = PCI_VENDOR_ID_EXAR,
+		.device = PCI_DEVICE_ID_EXAR_XR17C158,
+		.subvendor	= PCI_ANY_ID,
+		.subdevice	= PCI_ANY_ID,
+		.setup		= pci_xr17c154_setup,
+	},
 	/*
 	 * Xircom cards
 	 */
@@ -1558,46 +1591,55 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
 		.vendor         = PCI_VENDOR_ID_INTEL,
 		.device         = 0x8811,
 		.init		= pci_eg20t_init,
+		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = PCI_VENDOR_ID_INTEL,
 		.device         = 0x8812,
 		.init		= pci_eg20t_init,
+		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = PCI_VENDOR_ID_INTEL,
 		.device         = 0x8813,
 		.init		= pci_eg20t_init,
+		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = PCI_VENDOR_ID_INTEL,
 		.device         = 0x8814,
 		.init		= pci_eg20t_init,
+		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = 0x10DB,
 		.device         = 0x8027,
 		.init		= pci_eg20t_init,
+		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = 0x10DB,
 		.device         = 0x8028,
 		.init		= pci_eg20t_init,
+		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = 0x10DB,
 		.device         = 0x8029,
 		.init		= pci_eg20t_init,
+		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = 0x10DB,
 		.device         = 0x800C,
 		.init		= pci_eg20t_init,
+		.setup		= pci_default_setup,
 	},
 	{
 		.vendor         = 0x10DB,
 		.device         = 0x800D,
 		.init		= pci_eg20t_init,
+		.setup		= pci_default_setup,
 	},
 	/*
 	 * Cronyx Omega PCI (PLX-chip based)

drivers/tty/serial/Kconfig

@@ -267,6 +267,13 @@ config SERIAL_8250_RM9K
 	  port hardware found on MIPS RM9122 and similar processors.
 	  If unsure, say N.
 
+config SERIAL_8250_DW
+	tristate "Support for Synopsys DesignWare 8250 quirks"
+	depends on SERIAL_8250 && OF
+	help
+	  Selecting this option will enable handling of the extra features
+	  present in the Synopsys DesignWare APB UART.
+
 comment "Non-8250 serial port support"
 
 config SERIAL_AMBA_PL010
@@ -522,8 +529,8 @@ config SERIAL_S3C6400
 
 config SERIAL_S5PV210
 	tristate "Samsung S5PV210 Serial port support"
-	depends on SERIAL_SAMSUNG && (CPU_S5PV210 || CPU_EXYNOS4210)
-	select SERIAL_SAMSUNG_UARTS_4 if (CPU_S5PV210 || CPU_EXYNOS4210)
+	depends on SERIAL_SAMSUNG && (CPU_S5PV210 || CPU_EXYNOS4210 || SOC_EXYNOS4212)
+	select SERIAL_SAMSUNG_UARTS_4 if (CPU_S5PV210 || CPU_EXYNOS4210 || SOC_EXYNOS4212)
 	default y
 	help
 	  Serial port support for Samsung's S5P Family of SoC's
@@ -722,7 +729,7 @@ config SERIAL_BFIN
 	  Add support for the built-in UARTs on the Blackfin.
 
 	  To compile this driver as a module, choose M here: the
-	  module will be called bfin_5xx.
+	  module is named bfin_uart.ko.
 
 config SERIAL_BFIN_CONSOLE
 	bool "Console on Blackfin serial port"
@@ -1035,23 +1042,6 @@ config SERIAL_MCF_CONSOLE
 	help
 	  Enable a ColdFire internal serial port to be the system console.
 
-config SERIAL_68360_SMC
-	bool "68360 SMC uart support"
-	depends on M68360
-	help
-	  This driver supports the SMC serial ports of the Motorola 68360 CPU.
-
-config SERIAL_68360_SCC
-	bool "68360 SCC uart support"
-	depends on M68360
-	help
-	  This driver supports the SCC serial ports of the Motorola 68360 CPU.
-
-config SERIAL_68360
-	bool
-	depends on SERIAL_68360_SMC || SERIAL_68360_SCC
-	default y
-
 config SERIAL_PMACZILOG
 	tristate "Mac or PowerMac z85c30 ESCC support"
 	depends on (M68K && MAC) || (PPC_OF && PPC_PMAC)

drivers/tty/serial/Makefile

@@ -28,6 +28,7 @@ obj-$(CONFIG_SERIAL_8250_BOCA) += 8250_boca.o
 obj-$(CONFIG_SERIAL_8250_EXAR_ST16C554) += 8250_exar_st16c554.o
 obj-$(CONFIG_SERIAL_8250_HUB6) += 8250_hub6.o
 obj-$(CONFIG_SERIAL_8250_MCA) += 8250_mca.o
+obj-$(CONFIG_SERIAL_8250_DW) += 8250_dw.o
 obj-$(CONFIG_SERIAL_AMBA_PL010) += amba-pl010.o
 obj-$(CONFIG_SERIAL_AMBA_PL011) += amba-pl011.o
 obj-$(CONFIG_SERIAL_CLPS711X) += clps711x.o
@@ -35,7 +36,7 @@ obj-$(CONFIG_SERIAL_PXA) += pxa.o
 obj-$(CONFIG_SERIAL_PNX8XXX) += pnx8xxx_uart.o
 obj-$(CONFIG_SERIAL_SA1100) += sa1100.o
 obj-$(CONFIG_SERIAL_BCM63XX) += bcm63xx_uart.o
-obj-$(CONFIG_SERIAL_BFIN) += bfin_5xx.o
+obj-$(CONFIG_SERIAL_BFIN) += bfin_uart.o
 obj-$(CONFIG_SERIAL_BFIN_SPORT) += bfin_sport_uart.o
 obj-$(CONFIG_SERIAL_SAMSUNG) += samsung.o
 obj-$(CONFIG_SERIAL_S3C2410) += s3c2410.o
@@ -49,7 +50,6 @@ obj-$(CONFIG_SERIAL_MAX3107_AAVA) += max3107-aava.o
 obj-$(CONFIG_SERIAL_IP22_ZILOG) += ip22zilog.o
 obj-$(CONFIG_SERIAL_MUX) += mux.o
 obj-$(CONFIG_SERIAL_68328) += 68328serial.o
-obj-$(CONFIG_SERIAL_68360) += 68360serial.o
 obj-$(CONFIG_SERIAL_MCF) += mcf.o
 obj-$(CONFIG_SERIAL_PMACZILOG) += pmac_zilog.o
 obj-$(CONFIG_SERIAL_DZ) += dz.o

drivers/tty/serial/altera_jtaguart.c

@@ -218,7 +218,7 @@ static int altera_jtaguart_startup(struct uart_port *port)
 	unsigned long flags;
 	int ret;
 
-	ret = request_irq(port->irq, altera_jtaguart_interrupt, IRQF_DISABLED,
+	ret = request_irq(port->irq, altera_jtaguart_interrupt, 0,
 			DRV_NAME, port);
 	if (ret) {
 		pr_err(DRV_NAME ": unable to attach Altera JTAG UART %d "

drivers/tty/serial/altera_uart.c

@@ -315,7 +315,7 @@ static int altera_uart_startup(struct uart_port *port)
 		return 0;
 	}
 
-	ret = request_irq(port->irq, altera_uart_interrupt, IRQF_DISABLED,
+	ret = request_irq(port->irq, altera_uart_interrupt, 0,
 			DRV_NAME, port);
 	if (ret) {
 		pr_err(DRV_NAME ": unable to attach Altera UART %d "

drivers/tty/serial/apbuart.c

@@ -16,6 +16,7 @@
 
 #include <linux/module.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/serial.h>

drivers/tty/serial/atmel_serial.c

@@ -33,6 +33,8 @@
 #include <linux/sysrq.h>
 #include <linux/tty_flip.h>
 #include <linux/platform_device.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/dma-mapping.h>
 #include <linux/atmel_pdc.h>
 #include <linux/atmel_serial.h>
@@ -157,11 +159,22 @@ struct atmel_uart_port {
 };
 
 static struct atmel_uart_port atmel_ports[ATMEL_MAX_UART];
+static unsigned long atmel_ports_in_use;
 
 #ifdef SUPPORT_SYSRQ
 static struct console atmel_console;
 #endif
 
+#if defined(CONFIG_OF)
+static const struct of_device_id atmel_serial_dt_ids[] = {
+	{ .compatible = "atmel,at91rm9200-usart" },
+	{ .compatible = "atmel,at91sam9260-usart" },
+	{ /* sentinel */ }
+};
+
+MODULE_DEVICE_TABLE(of, atmel_serial_dt_ids);
+#endif
+
 static inline struct atmel_uart_port *
 to_atmel_uart_port(struct uart_port *uart)
 {
@@ -339,7 +352,8 @@ static void atmel_stop_tx(struct uart_port *port)
 	/* Disable interrupts */
 	UART_PUT_IDR(port, atmel_port->tx_done_mask);
 
-	if (atmel_port->rs485.flags & SER_RS485_ENABLED)
+	if ((atmel_port->rs485.flags & SER_RS485_ENABLED) &&
+	    !(atmel_port->rs485.flags & SER_RS485_RX_DURING_TX))
 		atmel_start_rx(port);
 }
 
@@ -356,7 +370,8 @@ static void atmel_start_tx(struct uart_port *port)
 			   really need this.*/
 			return;
 
-		if (atmel_port->rs485.flags & SER_RS485_ENABLED)
+		if ((atmel_port->rs485.flags & SER_RS485_ENABLED) &&
+		    !(atmel_port->rs485.flags & SER_RS485_RX_DURING_TX))
 			atmel_stop_rx(port);
 
 		/* re-enable PDC transmit */
@@ -680,7 +695,8 @@ static void atmel_tx_dma(struct uart_port *port)
 		/* Enable interrupts */
 		UART_PUT_IER(port, atmel_port->tx_done_mask);
 	} else {
-		if (atmel_port->rs485.flags & SER_RS485_ENABLED) {
+		if ((atmel_port->rs485.flags & SER_RS485_ENABLED) &&
+		    !(atmel_port->rs485.flags & SER_RS485_RX_DURING_TX)) {
 			/* DMA done, stop TX, start RX for RS485 */
 			atmel_start_rx(port);
 		}
@@ -1407,6 +1423,48 @@ static struct uart_ops atmel_pops = {
 #endif
 };
 
+static void __devinit atmel_of_init_port(struct atmel_uart_port *atmel_port,
+					 struct device_node *np)
+{
+	u32 rs485_delay[2];
+
+	/* DMA/PDC usage specification */
+	if (of_get_property(np, "atmel,use-dma-rx", NULL))
+		atmel_port->use_dma_rx	= 1;
+	else
+		atmel_port->use_dma_rx	= 0;
+	if (of_get_property(np, "atmel,use-dma-tx", NULL))
+		atmel_port->use_dma_tx	= 1;
+	else
+		atmel_port->use_dma_tx	= 0;
+
+	/* rs485 properties */
+	if (of_property_read_u32_array(np, "rs485-rts-delay",
+					    rs485_delay, 2) == 0) {
+		struct serial_rs485 *rs485conf = &atmel_port->rs485;
+
+		rs485conf->delay_rts_before_send = rs485_delay[0];
+		rs485conf->delay_rts_after_send = rs485_delay[1];
+		rs485conf->flags = 0;
+
+		if (rs485conf->delay_rts_before_send == 0 &&
+		    rs485conf->delay_rts_after_send == 0) {
+			rs485conf->flags |= SER_RS485_RTS_ON_SEND;
+		} else {
+			if (rs485conf->delay_rts_before_send)
+				rs485conf->flags |= SER_RS485_RTS_BEFORE_SEND;
+			if (rs485conf->delay_rts_after_send)
+				rs485conf->flags |= SER_RS485_RTS_AFTER_SEND;
+		}
+
+		if (of_get_property(np, "rs485-rx-during-tx", NULL))
+			rs485conf->flags |= SER_RS485_RX_DURING_TX;
+
+		if (of_get_property(np, "linux,rs485-enabled-at-boot-time", NULL))
+			rs485conf->flags |= SER_RS485_ENABLED;
+	}
+}
+
 /*
  * Configure the port from the platform device resource info.
  */
@@ -1414,13 +1472,20 @@ static void __devinit atmel_init_port(struct atmel_uart_port *atmel_port,
 				      struct platform_device *pdev)
 {
 	struct uart_port *port = &atmel_port->uart;
-	struct atmel_uart_data *data = pdev->dev.platform_data;
+	struct atmel_uart_data *pdata = pdev->dev.platform_data;
+
+	if (pdev->dev.of_node) {
+		atmel_of_init_port(atmel_port, pdev->dev.of_node);
+	} else {
+		atmel_port->use_dma_rx	= pdata->use_dma_rx;
+		atmel_port->use_dma_tx	= pdata->use_dma_tx;
+		atmel_port->rs485	= pdata->rs485;
+	}
 
 	port->iotype		= UPIO_MEM;
 	port->flags		= UPF_BOOT_AUTOCONF;
 	port->ops		= &atmel_pops;
 	port->fifosize		= 1;
-	port->line		= data->num;
 	port->dev		= &pdev->dev;
 	port->mapbase	= pdev->resource[0].start;
 	port->irq	= pdev->resource[1].start;
@@ -1430,10 +1495,10 @@ static void __devinit atmel_init_port(struct atmel_uart_port *atmel_port,
 
 	memset(&atmel_port->rx_ring, 0, sizeof(atmel_port->rx_ring));
 
-	if (data->regs)
+	if (pdata && pdata->regs) {
 		/* Already mapped by setup code */
-		port->membase = data->regs;
-	else {
+		port->membase = pdata->regs;
+	} else {
 		port->flags	|= UPF_IOREMAP;
 		port->membase	= NULL;
 	}
@@ -1447,9 +1512,6 @@ static void __devinit atmel_init_port(struct atmel_uart_port *atmel_port,
 		/* only enable clock when USART is in use */
 	}
 
-	atmel_port->use_dma_rx = data->use_dma_rx;
-	atmel_port->use_dma_tx = data->use_dma_tx;
-	atmel_port->rs485	= data->rs485;
 	/* Use TXEMPTY for interrupt when rs485 else TXRDY or ENDTX|TXBUFE */
 	if (atmel_port->rs485.flags & SER_RS485_ENABLED)
 		atmel_port->tx_done_mask = ATMEL_US_TXEMPTY;
@@ -1611,10 +1673,14 @@ static int __init atmel_console_init(void)
 	if (atmel_default_console_device) {
 		struct atmel_uart_data *pdata =
 			atmel_default_console_device->dev.platform_data;
+		int id = pdata->num;
+		struct atmel_uart_port *port = &atmel_ports[id];
+
+		port->backup_imr = 0;
+		port->uart.line = id;
 
-		add_preferred_console(ATMEL_DEVICENAME, pdata->num, NULL);
-		atmel_init_port(&atmel_ports[pdata->num],
-				atmel_default_console_device);
+		add_preferred_console(ATMEL_DEVICENAME, id, NULL);
+		atmel_init_port(port, atmel_default_console_device);
 		register_console(&atmel_console);
 	}
 
@@ -1711,14 +1777,39 @@ static int atmel_serial_resume(struct platform_device *pdev)
 static int __devinit atmel_serial_probe(struct platform_device *pdev)
 {
 	struct atmel_uart_port *port;
+	struct device_node *np = pdev->dev.of_node;
 	struct atmel_uart_data *pdata = pdev->dev.platform_data;
 	void *data;
-	int ret;
+	int ret = -ENODEV;
 
 	BUILD_BUG_ON(ATMEL_SERIAL_RINGSIZE & (ATMEL_SERIAL_RINGSIZE - 1));
 
-	port = &atmel_ports[pdata->num];
+	if (np)
+		ret = of_alias_get_id(np, "serial");
+	else
+		if (pdata)
+			ret = pdata->num;
+
+	if (ret < 0)
+		/* port id not found in platform data nor device-tree aliases:
+		 * auto-enumerate it */
+		ret = find_first_zero_bit(&atmel_ports_in_use,
+				sizeof(atmel_ports_in_use));
+
+	if (ret > ATMEL_MAX_UART) {
+		ret = -ENODEV;
+		goto err;
+	}
+
+	if (test_and_set_bit(ret, &atmel_ports_in_use)) {
+		/* port already in use */
+		ret = -EBUSY;
+		goto err;
+	}
+
+	port = &atmel_ports[ret];
 	port->backup_imr = 0;
+	port->uart.line = ret;
 
 	atmel_init_port(port, pdev);
 
@@ -1764,7 +1855,7 @@ err_alloc_ring:
 		clk_put(port->clk);
 		port->clk = NULL;
 	}
-
+err:
 	return ret;
 }
 
@@ -1784,6 +1875,8 @@ static int __devexit atmel_serial_remove(struct platform_device *pdev)
 
 	/* "port" is allocated statically, so we shouldn't free it */
 
+	clear_bit(port->line, &atmel_ports_in_use);
+
 	clk_put(atmel_port->clk);
 
 	return ret;
@@ -1797,6 +1890,7 @@ static struct platform_driver atmel_serial_driver = {
 	.driver		= {
 		.name	= "atmel_usart",
 		.owner	= THIS_MODULE,
+		.of_match_table	= of_match_ptr(atmel_serial_dt_ids),
 	},
 };
 

drivers/tty/serial/bfin_sport_uart.c

@@ -294,7 +294,7 @@ static int sport_startup(struct uart_port *port)
 		if (request_irq(gpio_to_irq(up->cts_pin),
 			sport_mctrl_cts_int,
 			IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
-			IRQF_DISABLED, "BFIN_SPORT_UART_CTS", up)) {
+			0, "BFIN_SPORT_UART_CTS", up)) {
 			up->cts_pin = -1;
 			dev_info(port->dev, "Unable to attach BlackFin UART over SPORT CTS interrupt. So, disable it.\n");
 		}

drivers/tty/serial/bfin_5xx.c → drivers/tty/serial/bfin_uart.c

@@ -234,8 +234,8 @@ static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
 	status = UART_GET_LSR(uart);
 	UART_CLEAR_LSR(uart);
 
- 	ch = UART_GET_CHAR(uart);
- 	uart->port.icount.rx++;
+	ch = UART_GET_CHAR(uart);
+	uart->port.icount.rx++;
 
 #if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
 	defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
@@ -667,17 +667,17 @@ static int bfin_serial_startup(struct uart_port *port)
 		kgdboc_break_enabled = 0;
 	else {
 # endif
-	if (request_irq(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
+	if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0,
 	     "BFIN_UART_RX", uart)) {
 		printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
 		return -EBUSY;
 	}
 
 	if (request_irq
-	    (uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
+	    (uart->tx_irq, bfin_serial_tx_int, 0,
 	     "BFIN_UART_TX", uart)) {
 		printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
-		free_irq(uart->port.irq, uart);
+		free_irq(uart->rx_irq, uart);
 		return -EBUSY;
 	}
 
@@ -692,7 +692,7 @@ static int bfin_serial_startup(struct uart_port *port)
 		 */
 		unsigned uart_dma_ch_rx, uart_dma_ch_tx;
 
-		switch (uart->port.irq) {
+		switch (uart->rx_irq) {
 		case IRQ_UART3_RX:
 			uart_dma_ch_rx = CH_UART3_RX;
 			uart_dma_ch_tx = CH_UART3_TX;
@@ -709,16 +709,16 @@ static int bfin_serial_startup(struct uart_port *port)
 		if (uart_dma_ch_rx &&
 			request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
 			printk(KERN_NOTICE"Fail to attach UART interrupt\n");
-			free_irq(uart->port.irq, uart);
-			free_irq(uart->port.irq + 1, uart);
+			free_irq(uart->rx_irq, uart);
+			free_irq(uart->tx_irq, uart);
 			return -EBUSY;
 		}
 		if (uart_dma_ch_tx &&
 			request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
 			printk(KERN_NOTICE "Fail to attach UART interrupt\n");
 			free_dma(uart_dma_ch_rx);
-			free_irq(uart->port.irq, uart);
-			free_irq(uart->port.irq + 1, uart);
+			free_irq(uart->rx_irq, uart);
+			free_irq(uart->tx_irq, uart);
 			return -EBUSY;
 		}
 	}
@@ -734,19 +734,18 @@ static int bfin_serial_startup(struct uart_port *port)
 		if (request_irq(gpio_to_irq(uart->cts_pin),
 			bfin_serial_mctrl_cts_int,
 			IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
-			IRQF_DISABLED, "BFIN_UART_CTS", uart)) {
+			0, "BFIN_UART_CTS", uart)) {
 			uart->cts_pin = -1;
 			pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
 		}
 	}
-	if (uart->rts_pin >= 0) {
+	if (uart->rts_pin >= 0)
 		gpio_direction_output(uart->rts_pin, 0);
-	}
 #endif
 #ifdef CONFIG_SERIAL_BFIN_HARD_CTSRTS
 	if (uart->cts_pin >= 0 && request_irq(uart->status_irq,
 		bfin_serial_mctrl_cts_int,
-		IRQF_DISABLED, "BFIN_UART_MODEM_STATUS", uart)) {
+		0, "BFIN_UART_MODEM_STATUS", uart)) {
 		uart->cts_pin = -1;
 		pr_info("Unable to attach BlackFin UART Modem Status interrupt.\n");
 	}
@@ -786,8 +785,8 @@ static void bfin_serial_shutdown(struct uart_port *port)
 		break;
 	};
 #endif
-	free_irq(uart->port.irq, uart);
-	free_irq(uart->port.irq+1, uart);
+	free_irq(uart->rx_irq, uart);
+	free_irq(uart->tx_irq, uart);
 #endif
 
 #ifdef CONFIG_SERIAL_BFIN_CTSRTS
@@ -1091,10 +1090,18 @@ bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
 				*parity = 'o';
 		}
 		switch (lcr & 0x03) {
-			case 0:	*bits = 5; break;
-			case 1:	*bits = 6; break;
-			case 2:	*bits = 7; break;
-			case 3:	*bits = 8; break;
+		case 0:
+			*bits = 5;
+			break;
+		case 1:
+			*bits = 6;
+			break;
+		case 2:
+			*bits = 7;
+			break;
+		case 3:
+			*bits = 8;
+			break;
 		}
 		/* Set DLAB in LCR to Access DLL and DLH */
 		UART_SET_DLAB(uart);
@@ -1183,7 +1190,7 @@ static struct console bfin_serial_console = {
 	.index		= -1,
 	.data		= &bfin_serial_reg,
 };
-#define BFIN_SERIAL_CONSOLE	&bfin_serial_console
+#define BFIN_SERIAL_CONSOLE	(&bfin_serial_console)
 #else
 #define BFIN_SERIAL_CONSOLE	NULL
 #endif /* CONFIG_SERIAL_BFIN_CONSOLE */
@@ -1312,14 +1319,22 @@ static int bfin_serial_probe(struct platform_device *pdev)
 		}
 		uart->port.mapbase = res->start;
 
-		uart->port.irq = platform_get_irq(pdev, 0);
-		if (uart->port.irq < 0) {
-			dev_err(&pdev->dev, "No uart RX/TX IRQ specified\n");
+		uart->tx_irq = platform_get_irq(pdev, 0);
+		if (uart->tx_irq < 0) {
+			dev_err(&pdev->dev, "No uart TX IRQ specified\n");
+			ret = -ENOENT;
+			goto out_error_unmap;
+		}
+
+		uart->rx_irq = platform_get_irq(pdev, 1);
+		if (uart->rx_irq < 0) {
+			dev_err(&pdev->dev, "No uart RX IRQ specified\n");
 			ret = -ENOENT;
 			goto out_error_unmap;
 		}
+		uart->port.irq = uart->rx_irq;
 
-		uart->status_irq = platform_get_irq(pdev, 1);
+		uart->status_irq = platform_get_irq(pdev, 2);
 		if (uart->status_irq < 0) {
 			dev_err(&pdev->dev, "No uart status IRQ specified\n");
 			ret = -ENOENT;

drivers/tty/serial/cpm_uart/cpm_uart_core.c

@@ -31,6 +31,7 @@
 
 #include <linux/module.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/serial.h>

drivers/tty/serial/crisv10.c

@@ -258,7 +258,7 @@ static struct e100_serial rs_table[] = {
 	  .dma_out_enabled = 1,
 	  .dma_out_nbr = SER0_TX_DMA_NBR,
 	  .dma_out_irq_nbr = SER0_DMA_TX_IRQ_NBR,
-	  .dma_out_irq_flags = IRQF_DISABLED,
+	  .dma_out_irq_flags = 0,
 	  .dma_out_irq_description = "serial 0 dma tr",
 #else
 	  .dma_out_enabled = 0,
@@ -271,7 +271,7 @@ static struct e100_serial rs_table[] = {
 	  .dma_in_enabled = 1,
 	  .dma_in_nbr = SER0_RX_DMA_NBR,
 	  .dma_in_irq_nbr = SER0_DMA_RX_IRQ_NBR,
-	  .dma_in_irq_flags = IRQF_DISABLED,
+	  .dma_in_irq_flags = 0,
 	  .dma_in_irq_description = "serial 0 dma rec",
 #else
 	  .dma_in_enabled = 0,
@@ -313,7 +313,7 @@ static struct e100_serial rs_table[] = {
 	  .dma_out_enabled = 1,
 	  .dma_out_nbr = SER1_TX_DMA_NBR,
 	  .dma_out_irq_nbr = SER1_DMA_TX_IRQ_NBR,
-	  .dma_out_irq_flags = IRQF_DISABLED,
+	  .dma_out_irq_flags = 0,
 	  .dma_out_irq_description = "serial 1 dma tr",
 #else
 	  .dma_out_enabled = 0,
@@ -326,7 +326,7 @@ static struct e100_serial rs_table[] = {
 	  .dma_in_enabled = 1,
 	  .dma_in_nbr = SER1_RX_DMA_NBR,
 	  .dma_in_irq_nbr = SER1_DMA_RX_IRQ_NBR,
-	  .dma_in_irq_flags = IRQF_DISABLED,
+	  .dma_in_irq_flags = 0,
 	  .dma_in_irq_description = "serial 1 dma rec",
 #else
 	  .dma_in_enabled = 0,
@@ -369,7 +369,7 @@ static struct e100_serial rs_table[] = {
 	  .dma_out_enabled = 1,
 	  .dma_out_nbr = SER2_TX_DMA_NBR,
 	  .dma_out_irq_nbr = SER2_DMA_TX_IRQ_NBR,
-	  .dma_out_irq_flags = IRQF_DISABLED,
+	  .dma_out_irq_flags = 0,
 	  .dma_out_irq_description = "serial 2 dma tr",
 #else
 	  .dma_out_enabled = 0,
@@ -382,7 +382,7 @@ static struct e100_serial rs_table[] = {
 	  .dma_in_enabled = 1,
 	  .dma_in_nbr = SER2_RX_DMA_NBR,
 	  .dma_in_irq_nbr = SER2_DMA_RX_IRQ_NBR,
-	  .dma_in_irq_flags = IRQF_DISABLED,
+	  .dma_in_irq_flags = 0,
 	  .dma_in_irq_description = "serial 2 dma rec",
 #else
 	  .dma_in_enabled = 0,
@@ -423,7 +423,7 @@ static struct e100_serial rs_table[] = {
 	  .dma_out_enabled = 1,
 	  .dma_out_nbr = SER3_TX_DMA_NBR,
 	  .dma_out_irq_nbr = SER3_DMA_TX_IRQ_NBR,
-	  .dma_out_irq_flags = IRQF_DISABLED,
+	  .dma_out_irq_flags = 0,
 	  .dma_out_irq_description = "serial 3 dma tr",
 #else
 	  .dma_out_enabled = 0,
@@ -436,7 +436,7 @@ static struct e100_serial rs_table[] = {
 	  .dma_in_enabled = 1,
 	  .dma_in_nbr = SER3_RX_DMA_NBR,
 	  .dma_in_irq_nbr = SER3_DMA_RX_IRQ_NBR,
-	  .dma_in_irq_flags = IRQF_DISABLED,
+	  .dma_in_irq_flags = 0,
 	  .dma_in_irq_description = "serial 3 dma rec",
 #else
 	  .dma_in_enabled = 0,
@@ -1788,7 +1788,7 @@ static unsigned int handle_descr_data(struct e100_serial *info,
 	struct etrax_recv_buffer *buffer = phys_to_virt(descr->buf) - sizeof *buffer;
 
 	if (info->recv_cnt + recvl > 65536) {
-		printk(KERN_CRIT
+		printk(KERN_WARNING
 		       "%s: Too much pending incoming serial data! Dropping %u bytes.\n", __func__, recvl);
 		return 0;
 	}
@@ -3813,13 +3813,13 @@ rs_close(struct tty_struct *tty, struct file * filp)
 		 * one, we've got real problems, since it means the
 		 * serial port won't be shutdown.
 		 */
-		printk(KERN_CRIT
+		printk(KERN_ERR
 		       "rs_close: bad serial port count; tty->count is 1, "
 		       "info->count is %d\n", info->count);
 		info->count = 1;
 	}
 	if (--info->count < 0) {
-		printk(KERN_CRIT "rs_close: bad serial port count for ttyS%d: %d\n",
+		printk(KERN_ERR "rs_close: bad serial port count for ttyS%d: %d\n",
 		       info->line, info->count);
 		info->count = 0;
 	}
@@ -4452,7 +4452,7 @@ static int __init rs_init(void)
 #if defined(CONFIG_ETRAX_RS485_ON_PA)
 	if (cris_io_interface_allocate_pins(if_serial_0, 'a', rs485_pa_bit,
 			rs485_pa_bit)) {
-		printk(KERN_CRIT "ETRAX100LX serial: Could not allocate "
+		printk(KERN_ERR "ETRAX100LX serial: Could not allocate "
 			"RS485 pin\n");
 		put_tty_driver(driver);
 		return -EBUSY;
@@ -4461,7 +4461,7 @@ static int __init rs_init(void)
 #if defined(CONFIG_ETRAX_RS485_ON_PORT_G)
 	if (cris_io_interface_allocate_pins(if_serial_0, 'g', rs485_pa_bit,
 			rs485_port_g_bit)) {
-		printk(KERN_CRIT "ETRAX100LX serial: Could not allocate "
+		printk(KERN_ERR "ETRAX100LX serial: Could not allocate "
 			"RS485 pin\n");
 		put_tty_driver(driver);
 		return -EBUSY;
@@ -4494,7 +4494,7 @@ static int __init rs_init(void)
 		if (info->enabled) {
 			if (cris_request_io_interface(info->io_if,
 					info->io_if_description)) {
-				printk(KERN_CRIT "ETRAX100LX async serial: "
+				printk(KERN_ERR "ETRAX100LX async serial: "
 					"Could not allocate IO pins for "
 					"%s, port %d\n",
 					info->io_if_description, i);
@@ -4558,7 +4558,7 @@ static int __init rs_init(void)
 	/* hook the irq's for DMA channel 6 and 7, serial output and input, and some more... */
 
 	if (request_irq(SERIAL_IRQ_NBR, ser_interrupt,
-			IRQF_SHARED | IRQF_DISABLED, "serial ", driver))
+			IRQF_SHARED, "serial ", driver))
 		panic("%s: Failed to request irq8", __func__);
 
 #endif

drivers/tty/serial/dz.c

@@ -47,6 +47,7 @@
 #include <linux/serial_core.h>
 #include <linux/sysrq.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 
 #include <linux/atomic.h>
 #include <asm/bootinfo.h>

drivers/tty/serial/icom.c

@@ -1554,7 +1554,7 @@ static int __devinit icom_probe(struct pci_dev *dev,
 
 	 /* save off irq and request irq line */
 	 if ( (retval = request_irq(dev->irq, icom_interrupt,
-				   IRQF_DISABLED | IRQF_SHARED, ICOM_DRIVER_NAME,
+				   IRQF_SHARED, ICOM_DRIVER_NAME,
 				   (void *) icom_adapter))) {
 		  goto probe_exit2;
 	 }

drivers/tty/serial/imx.c

@@ -508,8 +508,10 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
 		if (uart_handle_sysrq_char(&sport->port, (unsigned char)rx))
 			continue;
 
-		if (rx & (URXD_PRERR | URXD_OVRRUN | URXD_FRMERR) ) {
-			if (rx & URXD_PRERR)
+		if (unlikely(rx & URXD_ERR)) {
+			if (rx & URXD_BRK)
+				sport->port.icount.brk++;
+			else if (rx & URXD_PRERR)
 				sport->port.icount.parity++;
 			else if (rx & URXD_FRMERR)
 				sport->port.icount.frame++;
@@ -524,7 +526,9 @@ static irqreturn_t imx_rxint(int irq, void *dev_id)
 
 			rx &= sport->port.read_status_mask;
 
-			if (rx & URXD_PRERR)
+			if (rx & URXD_BRK)
+				flg = TTY_BREAK;
+			else if (rx & URXD_PRERR)
 				flg = TTY_PARITY;
 			else if (rx & URXD_FRMERR)
 				flg = TTY_FRAME;

drivers/tty/serial/ioc3_serial.c

@@ -13,6 +13,7 @@
  */
 #include <linux/errno.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/serial.h>
 #include <linux/circ_buf.h>
 #include <linux/serial_reg.h>

drivers/tty/serial/ioc4_serial.c

@@ -14,6 +14,7 @@
  */
 #include <linux/errno.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/serial.h>
 #include <linux/serialP.h>
 #include <linux/circ_buf.h>

drivers/tty/serial/jsm/jsm.h

@@ -88,7 +88,6 @@ enum {
 
 /* 4 extra for alignment play space */
 #define WRITEBUFLEN	((4096) + 4)
-#define MYFLIPLEN	N_TTY_BUF_SIZE
 
 #define JSM_VERSION	"jsm: 1.2-1-INKERNEL"
 #define JSM_PARTNUM	"40002438_A-INKERNEL"
@@ -150,7 +149,6 @@ struct jsm_board
 	u32		bd_uart_offset;	/* Space between each UART */
 
 	struct jsm_channel *channels[MAXPORTS]; /* array of pointers to our channels. */
-	char		*flipbuf;	/* Our flip buffer, alloced if board is found */
 
 	u32		bd_dividend;	/* Board/UARTs specific dividend */
 
@@ -177,16 +175,13 @@ struct jsm_board
 #define CH_TX_FIFO_LWM	0x0800		/* TX Fifo is below Low Water	*/
 #define CH_BREAK_SENDING 0x1000		/* Break is being sent		*/
 #define CH_LOOPBACK 0x2000		/* Channel is in lookback mode	*/
-#define CH_FLIPBUF_IN_USE 0x4000	/* Channel's flipbuf is in use	*/
 #define CH_BAUD0	0x08000		/* Used for checking B0 transitions */
 
 /* Our Read/Error/Write queue sizes */
 #define RQUEUEMASK	0x1FFF		/* 8 K - 1 */
 #define EQUEUEMASK	0x1FFF		/* 8 K - 1 */
-#define WQUEUEMASK	0x0FFF		/* 4 K - 1 */
 #define RQUEUESIZE	(RQUEUEMASK + 1)
 #define EQUEUESIZE	RQUEUESIZE
-#define WQUEUESIZE	(WQUEUEMASK + 1)
 
 
 /************************************************************************
@@ -226,10 +221,6 @@ struct jsm_channel {
 	u16		ch_e_head;	/* Head location of the error queue */
 	u16		ch_e_tail;	/* Tail location of the error queue */
 
-	u8		*ch_wqueue;	/* Our write queue buffer - malloc'ed */
-	u16		ch_w_head;	/* Head location of the write queue */
-	u16		ch_w_tail;	/* Tail location of the write queue */
-
 	u64		ch_rxcount;	/* total of data received so far */
 	u64		ch_txcount;	/* total of data transmitted so far */
 
@@ -378,7 +369,6 @@ extern int	jsm_debug;
  * Prototypes for non-static functions used in more than one module
  *
  *************************************************************************/
-int jsm_tty_write(struct uart_port *port);
 int jsm_tty_init(struct jsm_board *);
 int jsm_uart_port_init(struct jsm_board *);
 int jsm_remove_uart_port(struct jsm_board *);

drivers/tty/serial/jsm/jsm_driver.c

@@ -160,27 +160,10 @@ static int __devinit jsm_probe_one(struct pci_dev *pdev, const struct pci_device
 	dev_info(&pdev->dev, "board %d: Digi Neo (rev %d), irq %d\n",
 			adapter_count, brd->rev, brd->irq);
 
-	/*
-	 * allocate flip buffer for board.
-	 *
-	 * Okay to malloc with GFP_KERNEL, we are not at interrupt
-	 * context, and there are no locks held.
-	 */
-	brd->flipbuf = kzalloc(MYFLIPLEN, GFP_KERNEL);
-	if (!brd->flipbuf) {
-		/* XXX: leaking all resources from jsm_tty_init and
-		 	jsm_uart_port_init here! */
-		dev_err(&pdev->dev, "memory allocation for flipbuf failed\n");
-		rc = -ENOMEM;
-		goto out_free_uart;
-	}
-
 	pci_set_drvdata(pdev, brd);
 	pci_save_state(pdev);
 
 	return 0;
- out_free_uart:
-	jsm_remove_uart_port(brd);
  out_free_irq:
 	jsm_remove_uart_port(brd);
 	free_irq(brd->irq, brd);
@@ -211,14 +194,12 @@ static void __devexit jsm_remove_one(struct pci_dev *pdev)
 		if (brd->channels[i]) {
 			kfree(brd->channels[i]->ch_rqueue);
 			kfree(brd->channels[i]->ch_equeue);
-			kfree(brd->channels[i]->ch_wqueue);
 			kfree(brd->channels[i]);
 		}
 	}
 
 	pci_release_regions(pdev);
 	pci_disable_device(pdev);
-	kfree(brd->flipbuf);
 	kfree(brd);
 }
 

drivers/tty/serial/jsm/jsm_neo.c

@@ -496,12 +496,15 @@ static void neo_copy_data_from_queue_to_uart(struct jsm_channel *ch)
 	int s;
 	int qlen;
 	u32 len_written = 0;
+	struct circ_buf *circ;
 
 	if (!ch)
 		return;
 
+	circ = &ch->uart_port.state->xmit;
+
 	/* No data to write to the UART */
-	if (ch->ch_w_tail == ch->ch_w_head)
+	if (uart_circ_empty(circ))
 		return;
 
 	/* If port is "stopped", don't send any data to the UART */
@@ -517,11 +520,10 @@ static void neo_copy_data_from_queue_to_uart(struct jsm_channel *ch)
 		if (ch->ch_cached_lsr & UART_LSR_THRE) {
 			ch->ch_cached_lsr &= ~(UART_LSR_THRE);
 
-			writeb(ch->ch_wqueue[ch->ch_w_tail], &ch->ch_neo_uart->txrx);
+			writeb(circ->buf[circ->tail], &ch->ch_neo_uart->txrx);
 			jsm_printk(WRITE, INFO, &ch->ch_bd->pci_dev,
-					"Tx data: %x\n", ch->ch_wqueue[ch->ch_w_head]);
-			ch->ch_w_tail++;
-			ch->ch_w_tail &= WQUEUEMASK;
+					"Tx data: %x\n", circ->buf[circ->tail]);
+			circ->tail = (circ->tail + 1) & (UART_XMIT_SIZE - 1);
 			ch->ch_txcount++;
 		}
 		return;
@@ -536,36 +538,36 @@ static void neo_copy_data_from_queue_to_uart(struct jsm_channel *ch)
 	n = UART_17158_TX_FIFOSIZE - ch->ch_t_tlevel;
 
 	/* cache head and tail of queue */
-	head = ch->ch_w_head & WQUEUEMASK;
-	tail = ch->ch_w_tail & WQUEUEMASK;
-	qlen = (head - tail) & WQUEUEMASK;
+	head = circ->head & (UART_XMIT_SIZE - 1);
+	tail = circ->tail & (UART_XMIT_SIZE - 1);
+	qlen = uart_circ_chars_pending(circ);
 
 	/* Find minimum of the FIFO space, versus queue length */
 	n = min(n, qlen);
 
 	while (n > 0) {
 
-		s = ((head >= tail) ? head : WQUEUESIZE) - tail;
+		s = ((head >= tail) ? head : UART_XMIT_SIZE) - tail;
 		s = min(s, n);
 
 		if (s <= 0)
 			break;
 
-		memcpy_toio(&ch->ch_neo_uart->txrxburst, ch->ch_wqueue + tail, s);
+		memcpy_toio(&ch->ch_neo_uart->txrxburst, circ->buf + tail, s);
 		/* Add and flip queue if needed */
-		tail = (tail + s) & WQUEUEMASK;
+		tail = (tail + s) & (UART_XMIT_SIZE - 1);
 		n -= s;
 		ch->ch_txcount += s;
 		len_written += s;
 	}
 
 	/* Update the final tail */
-	ch->ch_w_tail = tail & WQUEUEMASK;
+	circ->tail = tail & (UART_XMIT_SIZE - 1);
 
 	if (len_written >= ch->ch_t_tlevel)
 		ch->ch_flags &= ~(CH_TX_FIFO_EMPTY | CH_TX_FIFO_LWM);
 
-	if (!jsm_tty_write(&ch->uart_port))
+	if (uart_circ_empty(circ))
 		uart_write_wakeup(&ch->uart_port);
 }
 
@@ -946,7 +948,6 @@ static void neo_param(struct jsm_channel *ch)
 	if ((ch->ch_c_cflag & (CBAUD)) == 0) {
 		ch->ch_r_head = ch->ch_r_tail = 0;
 		ch->ch_e_head = ch->ch_e_tail = 0;
-		ch->ch_w_head = ch->ch_w_tail = 0;
 
 		neo_flush_uart_write(ch);
 		neo_flush_uart_read(ch);

drivers/tty/serial/jsm/jsm_tty.c

@@ -118,6 +118,19 @@ static void jsm_tty_set_mctrl(struct uart_port *port, unsigned int mctrl)
 	udelay(10);
 }
 
+/*
+ * jsm_tty_write()
+ *
+ * Take data from the user or kernel and send it out to the FEP.
+ * In here exists all the Transparent Print magic as well.
+ */
+static void jsm_tty_write(struct uart_port *port)
+{
+	struct jsm_channel *channel;
+	channel = container_of(port, struct jsm_channel, uart_port);
+	channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel);
+}
+
 static void jsm_tty_start_tx(struct uart_port *port)
 {
 	struct jsm_channel *channel = (struct jsm_channel *)port;
@@ -216,14 +229,6 @@ static int jsm_tty_open(struct uart_port *port)
 			return -ENOMEM;
 		}
 	}
-	if (!channel->ch_wqueue) {
-		channel->ch_wqueue = kzalloc(WQUEUESIZE, GFP_KERNEL);
-		if (!channel->ch_wqueue) {
-			jsm_printk(INIT, ERR, &channel->ch_bd->pci_dev,
-				"unable to allocate write queue buf");
-			return -ENOMEM;
-		}
-	}
 
 	channel->ch_flags &= ~(CH_OPENING);
 	/*
@@ -237,7 +242,6 @@ static int jsm_tty_open(struct uart_port *port)
 	 */
 	channel->ch_r_head = channel->ch_r_tail = 0;
 	channel->ch_e_head = channel->ch_e_tail = 0;
-	channel->ch_w_head = channel->ch_w_tail = 0;
 
 	brd->bd_ops->flush_uart_write(channel);
 	brd->bd_ops->flush_uart_read(channel);
@@ -836,75 +840,3 @@ void jsm_check_queue_flow_control(struct jsm_channel *ch)
 		}
 	}
 }
-
-/*
- * jsm_tty_write()
- *
- * Take data from the user or kernel and send it out to the FEP.
- * In here exists all the Transparent Print magic as well.
- */
-int jsm_tty_write(struct uart_port *port)
-{
-	int bufcount;
-	int data_count = 0,data_count1 =0;
-	u16 head;
-	u16 tail;
-	u16 tmask;
-	u32 remain;
-	int temp_tail = port->state->xmit.tail;
-	struct jsm_channel *channel = (struct jsm_channel *)port;
-
-	tmask = WQUEUEMASK;
-	head = (channel->ch_w_head) & tmask;
-	tail = (channel->ch_w_tail) & tmask;
-
-	if ((bufcount = tail - head - 1) < 0)
-		bufcount += WQUEUESIZE;
-
-	bufcount = min(bufcount, 56);
-	remain = WQUEUESIZE - head;
-
-	data_count = 0;
-	if (bufcount >= remain) {
-		bufcount -= remain;
-		while ((port->state->xmit.head != temp_tail) &&
-		(data_count < remain)) {
-			channel->ch_wqueue[head++] =
-			port->state->xmit.buf[temp_tail];
-
-			temp_tail++;
-			temp_tail &= (UART_XMIT_SIZE - 1);
-			data_count++;
-		}
-		if (data_count == remain) head = 0;
-	}
-
-	data_count1 = 0;
-	if (bufcount > 0) {
-		remain = bufcount;
-		while ((port->state->xmit.head != temp_tail) &&
-			(data_count1 < remain)) {
-			channel->ch_wqueue[head++] =
-				port->state->xmit.buf[temp_tail];
-
-			temp_tail++;
-			temp_tail &= (UART_XMIT_SIZE - 1);
-			data_count1++;
-
-		}
-	}
-
-	port->state->xmit.tail = temp_tail;
-
-	data_count += data_count1;
-	if (data_count) {
-		head &= tmask;
-		channel->ch_w_head = head;
-	}
-
-	if (data_count) {
-		channel->ch_bd->bd_ops->copy_data_from_queue_to_uart(channel);
-	}
-
-	return data_count;
-}

drivers/tty/serial/lantiq.c

@@ -338,21 +338,21 @@ lqasc_startup(struct uart_port *port)
 		ASCCON_ROEN, port->membase + LTQ_ASC_CON);
 
 	retval = request_irq(ltq_port->tx_irq, lqasc_tx_int,
-		IRQF_DISABLED, "asc_tx", port);
+		0, "asc_tx", port);
 	if (retval) {
 		pr_err("failed to request lqasc_tx_int\n");
 		return retval;
 	}
 
 	retval = request_irq(ltq_port->rx_irq, lqasc_rx_int,
-		IRQF_DISABLED, "asc_rx", port);
+		0, "asc_rx", port);
 	if (retval) {
 		pr_err("failed to request lqasc_rx_int\n");
 		goto err1;
 	}
 
 	retval = request_irq(ltq_port->err_irq, lqasc_err_int,
-		IRQF_DISABLED, "asc_err", port);
+		0, "asc_err", port);
 	if (retval) {
 		pr_err("failed to request lqasc_err_int\n");
 		goto err2;

drivers/tty/serial/m32r_sio.c

@@ -32,6 +32,7 @@
 
 #include <linux/module.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/console.h>

drivers/tty/serial/max3100.c

@@ -47,6 +47,8 @@
 #include <linux/serial.h>
 #include <linux/spi/spi.h>
 #include <linux/freezer.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
 
 #include <linux/serial_max3100.h>
 

drivers/tty/serial/max3107.c

@@ -31,6 +31,8 @@
 #include <linux/device.h>
 #include <linux/serial_core.h>
 #include <linux/serial.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/gpio.h>
 #include <linux/spi/spi.h>
 #include <linux/freezer.h>

drivers/tty/serial/mcf.c

@@ -380,7 +380,7 @@ static void mcf_config_port(struct uart_port *port, int flags)
 	/* Clear mask, so no surprise interrupts. */
 	writeb(0, port->membase + MCFUART_UIMR);
 
-	if (request_irq(port->irq, mcf_interrupt, IRQF_DISABLED, "UART", port))
+	if (request_irq(port->irq, mcf_interrupt, 0, "UART", port))
 		printk(KERN_ERR "MCF: unable to attach ColdFire UART %d "
 			"interrupt vector=%d\n", port->line, port->irq);
 }

drivers/tty/serial/mfd.c

@@ -38,6 +38,7 @@
 #include <linux/pci.h>
 #include <linux/io.h>
 #include <linux/debugfs.h>
+#include <linux/pm_runtime.h>
 
 #define HSU_DMA_BUF_SIZE	2048
 
@@ -764,6 +765,8 @@ static int serial_hsu_startup(struct uart_port *port)
 		container_of(port, struct uart_hsu_port, port);
 	unsigned long flags;
 
+	pm_runtime_get_sync(up->dev);
+
 	/*
 	 * Clear the FIFO buffers and disable them.
 	 * (they will be reenabled in set_termios())
@@ -871,6 +874,8 @@ static void serial_hsu_shutdown(struct uart_port *port)
 				  UART_FCR_CLEAR_RCVR |
 				  UART_FCR_CLEAR_XMIT);
 	serial_out(up, UART_FCR, 0);
+
+	pm_runtime_put(up->dev);
 }
 
 static void
@@ -1249,6 +1254,39 @@ static int serial_hsu_resume(struct pci_dev *pdev)
 #define serial_hsu_resume	NULL
 #endif
 
+#ifdef CONFIG_PM_RUNTIME
+static int serial_hsu_runtime_idle(struct device *dev)
+{
+	int err;
+
+	err = pm_schedule_suspend(dev, 500);
+	if (err)
+		return -EBUSY;
+
+	return 0;
+}
+
+static int serial_hsu_runtime_suspend(struct device *dev)
+{
+	return 0;
+}
+
+static int serial_hsu_runtime_resume(struct device *dev)
+{
+	return 0;
+}
+#else
+#define serial_hsu_runtime_idle		NULL
+#define serial_hsu_runtime_suspend	NULL
+#define serial_hsu_runtime_resume	NULL
+#endif
+
+static const struct dev_pm_ops serial_hsu_pm_ops = {
+	.runtime_suspend = serial_hsu_runtime_suspend,
+	.runtime_resume = serial_hsu_runtime_resume,
+	.runtime_idle = serial_hsu_runtime_idle,
+};
+
 /* temp global pointer before we settle down on using one or four PCI dev */
 static struct hsu_port *phsu;
 
@@ -1315,6 +1353,9 @@ static int serial_hsu_probe(struct pci_dev *pdev,
 		pci_set_drvdata(pdev, uport);
 	}
 
+	pm_runtime_put_noidle(&pdev->dev);
+	pm_runtime_allow(&pdev->dev);
+
 	return 0;
 
 err_disable:
@@ -1411,6 +1452,9 @@ static void serial_hsu_remove(struct pci_dev *pdev)
 	if (!priv)
 		return;
 
+	pm_runtime_forbid(&pdev->dev);
+	pm_runtime_get_noresume(&pdev->dev);
+
 	/* For port 0/1/2, priv is the address of uart_hsu_port */
 	if (pdev->device != 0x081E) {
 		up = priv;
@@ -1423,7 +1467,7 @@ static void serial_hsu_remove(struct pci_dev *pdev)
 }
 
 /* First 3 are UART ports, and the 4th is the DMA */
-static const struct pci_device_id pci_ids[] __devinitdata = {
+static const struct pci_device_id pci_ids[] __devinitconst = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081B) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081C) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x081D) },
@@ -1438,6 +1482,9 @@ static struct pci_driver hsu_pci_driver = {
 	.remove =	__devexit_p(serial_hsu_remove),
 	.suspend =	serial_hsu_suspend,
 	.resume	=	serial_hsu_resume,
+	.driver = {
+		.pm = &serial_hsu_pm_ops,
+	},
 };
 
 static int __init hsu_pci_init(void)

drivers/tty/serial/mpc52xx_uart.c

@@ -34,6 +34,7 @@
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/serial.h>
 #include <linux/sysrq.h>
 #include <linux/console.h>
@@ -273,7 +274,7 @@ static unsigned int mpc5200b_psc_set_baudrate(struct uart_port *port,
 
 static void mpc52xx_psc_get_irq(struct uart_port *port, struct device_node *np)
 {
-	port->irqflags = IRQF_DISABLED;
+	port->irqflags = 0;
 	port->irq = irq_of_parse_and_map(np, 0);
 }
 

drivers/tty/serial/mrst_max3110.c

@@ -27,6 +27,10 @@
  *    interrupt for a low speed UART device
  */
 
+#ifdef CONFIG_MAGIC_SYSRQ
+#define SUPPORT_SYSRQ
+#endif
+
 #include <linux/module.h>
 #include <linux/ioport.h>
 #include <linux/irq.h>
@@ -73,9 +77,9 @@ struct uart_max3110 {
 /* global data structure, may need be removed */
 static struct uart_max3110 *pmax;
 
-static void receive_chars(struct uart_max3110 *max,
-				unsigned char *str, int len);
-static int max3110_read_multi(struct uart_max3110 *max, u8 *buf);
+static int receive_chars(struct uart_max3110 *max,
+				unsigned short *str, int len);
+static int max3110_read_multi(struct uart_max3110 *max);
 static void max3110_con_receive(struct uart_max3110 *max);
 
 static int max3110_write_then_read(struct uart_max3110 *max,
@@ -108,7 +112,6 @@ static int max3110_out(struct uart_max3110 *max, const u16 out)
 {
 	void *buf;
 	u16 *obuf, *ibuf;
-	u8  ch;
 	int ret;
 
 	buf = kzalloc(8, GFP_KERNEL | GFP_DMA);
@@ -125,11 +128,7 @@ static int max3110_out(struct uart_max3110 *max, const u16 out)
 		goto exit;
 	}
 
-	/* If some valid data is read back */
-	if (*ibuf & MAX3110_READ_DATA_AVAILABLE) {
-		ch = *ibuf & 0xff;
-		receive_chars(max, &ch, 1);
-	}
+	receive_chars(max, ibuf, 1);
 
 exit:
 	kfree(buf);
@@ -142,12 +141,11 @@ exit:
  *
  * Return how many valide bytes are read back
  */
-static int max3110_read_multi(struct uart_max3110 *max, u8 *rxbuf)
+static int max3110_read_multi(struct uart_max3110 *max)
 {
 	void *buf;
 	u16 *obuf, *ibuf;
-	u8 *pbuf, valid_str[M3110_RX_FIFO_DEPTH];
-	int i, j, blen;
+	int ret, blen;
 
 	blen = M3110_RX_FIFO_DEPTH * sizeof(u16);
 	buf = kzalloc(blen * 2, GFP_KERNEL | GFP_DMA);
@@ -165,19 +163,10 @@ static int max3110_read_multi(struct uart_max3110 *max, u8 *rxbuf)
 		return 0;
 	}
 
-	/* If caller doesn't provide a buffer, then handle received char */
-	pbuf = rxbuf ? rxbuf : valid_str;
-
-	for (i = 0, j = 0; i < M3110_RX_FIFO_DEPTH; i++) {
-		if (ibuf[i] & MAX3110_READ_DATA_AVAILABLE)
-			pbuf[j++] = ibuf[i] & 0xff;
-	}
-
-	if (j && (pbuf == valid_str))
-		receive_chars(max, valid_str, j);
+	ret = receive_chars(max, ibuf, M3110_RX_FIFO_DEPTH);
 
 	kfree(buf);
-	return j;
+	return ret;
 }
 
 static void serial_m3110_con_putchar(struct uart_port *port, int ch)
@@ -207,7 +196,7 @@ static void serial_m3110_con_write(struct console *co,
 	uart_console_write(&pmax->port, s, count, serial_m3110_con_putchar);
 
 	if (!test_and_set_bit(CON_TX_NEEDED, &pmax->uart_flags))
-		wake_up_process(pmax->main_thread);
+		wake_up(&pmax->wq);
 }
 
 static int __init
@@ -276,8 +265,7 @@ static void send_circ_buf(struct uart_max3110 *max,
 {
 	void *buf;
 	u16 *obuf, *ibuf;
-	u8 valid_str[WORDS_PER_XFER];
-	int i, j, len, blen, dma_size, left, ret = 0;
+	int i, len, blen, dma_size, left, ret = 0;
 
 
 	dma_size = WORDS_PER_XFER * sizeof(u16) * 2;
@@ -301,18 +289,13 @@ static void send_circ_buf(struct uart_max3110 *max,
 			}
 
 			/* Fail to send msg to console is not very critical */
+
 			ret = max3110_write_then_read(max, obuf, ibuf, blen, 0);
 			if (ret)
 				pr_warning(PR_FMT "%s(): get err msg %d\n",
 						__func__, ret);
 
-			for (i = 0, j = 0; i < len; i++) {
-				if (ibuf[i] & MAX3110_READ_DATA_AVAILABLE)
-					valid_str[j++] = ibuf[i] & 0xff;
-			}
-
-			if (j)
-				receive_chars(max, valid_str, j);
+			receive_chars(max, ibuf, len);
 
 			max->port.icount.tx += len;
 			left -= len;
@@ -349,33 +332,54 @@ static void serial_m3110_start_tx(struct uart_port *port)
 		container_of(port, struct uart_max3110, port);
 
 	if (!test_and_set_bit(UART_TX_NEEDED, &max->uart_flags))
-		wake_up_process(max->main_thread);
+		wake_up(&max->wq);
 }
 
-static void receive_chars(struct uart_max3110 *max, unsigned char *str, int len)
+static int
+receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
 {
 	struct uart_port *port = &max->port;
 	struct tty_struct *tty;
-	int usable;
+	char buf[M3110_RX_FIFO_DEPTH];
+	int r, w, usable;
 
 	/* If uart is not opened, just return */
 	if (!port->state)
-		return;
+		return 0;
 
-	tty = port->state->port.tty;
+	tty = tty_port_tty_get(&port->state->port);
 	if (!tty)
-		return;
+		return 0;
+
+	for (r = 0, w = 0; r < len; r++) {
+		if (str[r] & MAX3110_BREAK &&
+		    uart_handle_break(port))
+			continue;
+
+		if (str[r] & MAX3110_READ_DATA_AVAILABLE) {
+			if (uart_handle_sysrq_char(port, str[r] & 0xff))
+				continue;
+
+			buf[w++] = str[r] & 0xff;
+		}
+	}
+
+	if (!w) {
+		tty_kref_put(tty);
+		return 0;
+	}
 
-	while (len) {
-		usable = tty_buffer_request_room(tty, len);
+	for (r = 0; w; r += usable, w -= usable) {
+		usable = tty_buffer_request_room(tty, w);
 		if (usable) {
-			tty_insert_flip_string(tty, str, usable);
-			str += usable;
+			tty_insert_flip_string(tty, buf + r, usable);
 			port->icount.rx += usable;
 		}
-		len -= usable;
 	}
 	tty_flip_buffer_push(tty);
+	tty_kref_put(tty);
+
+	return r;
 }
 
 /*
@@ -390,28 +394,15 @@ static void receive_chars(struct uart_max3110 *max, unsigned char *str, int len)
  */
 static void max3110_con_receive(struct uart_max3110 *max)
 {
-	int loop = 1, num, total = 0;
-	u8 recv_buf[512], *pbuf;
+	int loop = 1, num;
 
-	pbuf = recv_buf;
 	do {
-		num = max3110_read_multi(max, pbuf);
+		num = max3110_read_multi(max);
 
 		if (num) {
 			loop = 5;
-			pbuf += num;
-			total += num;
-
-			if (total >= 504) {
-				receive_chars(max, recv_buf, total);
-				pbuf = recv_buf;
-				total = 0;
-			}
 		}
 	} while (--loop);
-
-	if (total)
-		receive_chars(max, recv_buf, total);
 }
 
 static int max3110_main_thread(void *_max)
@@ -424,7 +415,8 @@ static int max3110_main_thread(void *_max)
 	pr_info(PR_FMT "start main thread\n");
 
 	do {
-		wait_event_interruptible(*wq, max->uart_flags || kthread_should_stop());
+		wait_event_interruptible(*wq,
+				max->uart_flags || kthread_should_stop());
 
 		mutex_lock(&max->thread_mutex);
 
@@ -452,8 +444,9 @@ static irqreturn_t serial_m3110_irq(int irq, void *dev_id)
 
 	/* max3110's irq is a falling edge, not level triggered,
 	 * so no need to disable the irq */
+
 	if (!test_and_set_bit(BIT_IRQ_PENDING, &max->uart_flags))
-		wake_up_process(max->main_thread);
+		wake_up(&max->wq);
 
 	return IRQ_HANDLED;
 }

drivers/tty/serial/mrst_max3110.h

@@ -7,6 +7,7 @@
 /* status bits for all 4 MAX3110 operate modes */
 #define MAX3110_READ_DATA_AVAILABLE	(1 << 15)
 #define MAX3110_WRITE_BUF_EMPTY		(1 << 14)
+#define MAX3110_BREAK			(1 << 10)
 
 #define WC_TAG			(3 << 14)
 #define RC_TAG			(1 << 14)

drivers/tty/serial/msm_serial.c

@@ -804,8 +804,6 @@ static int __init msm_console_setup(struct console *co, char *options)
 	if (unlikely(!port->membase))
 		return -ENXIO;
 
-	port->cons = co;
-
 	msm_init_clock(port);
 
 	if (options)

drivers/tty/serial/msm_serial_hs.c

@@ -30,6 +30,8 @@
 
 #include <linux/serial.h>
 #include <linux/serial_core.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/slab.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>

drivers/tty/serial/mux.c

@@ -21,6 +21,8 @@
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/serial.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/console.h>
 #include <linux/delay.h> /* for udelay */
 #include <linux/device.h>

drivers/tty/serial/nwpserial.c

@@ -15,6 +15,7 @@
 #include <linux/serial_reg.h>
 #include <linux/serial_core.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/irqreturn.h>
 #include <linux/mutex.h>
 #include <linux/of_platform.h>

drivers/tty/serial/pch_uart.c

@@ -20,6 +20,8 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/serial_core.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/dmi.h>

drivers/tty/serial/pxa.c

@@ -100,6 +100,16 @@ static inline void receive_chars(struct uart_pxa_port *up, int *status)
 	int max_count = 256;
 
 	do {
+		/* work around Errata #20 according to
+		 * Intel(R) PXA27x Processor Family
+		 * Specification Update (May 2005)
+		 *
+		 * Step 2
+		 * Disable the Reciever Time Out Interrupt via IER[RTOEI]
+		 */
+		up->ier &= ~UART_IER_RTOIE;
+		serial_out(up, UART_IER, up->ier);
+
 		ch = serial_in(up, UART_RX);
 		flag = TTY_NORMAL;
 		up->port.icount.rx++;
@@ -156,6 +166,16 @@ static inline void receive_chars(struct uart_pxa_port *up, int *status)
 		*status = serial_in(up, UART_LSR);
 	} while ((*status & UART_LSR_DR) && (max_count-- > 0));
 	tty_flip_buffer_push(tty);
+
+	/* work around Errata #20 according to
+	 * Intel(R) PXA27x Processor Family
+	 * Specification Update (May 2005)
+	 *
+	 * Step 6:
+	 * No more data in FIFO: Re-enable RTO interrupt via IER[RTOIE]
+	 */
+	up->ier |= UART_IER_RTOIE;
+	serial_out(up, UART_IER, up->ier);
 }
 
 static void transmit_chars(struct uart_pxa_port *up)

drivers/tty/serial/samsung.c

@@ -83,6 +83,16 @@ static int s3c24xx_serial_txempty_nofifo(struct uart_port *port)
 	return (rd_regl(port, S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE);
 }
 
+/*
+ * s3c64xx and later SoC's include the interrupt mask and status registers in
+ * the controller itself, unlike the s3c24xx SoC's which have these registers
+ * in the interrupt controller. Check if the port type is s3c64xx or higher.
+ */
+static int s3c24xx_serial_has_interrupt_mask(struct uart_port *port)
+{
+	return to_ourport(port)->info->type == PORT_S3C6400;
+}
+
 static void s3c24xx_serial_rx_enable(struct uart_port *port)
 {
 	unsigned long flags;
@@ -126,7 +136,11 @@ static void s3c24xx_serial_stop_tx(struct uart_port *port)
 	struct s3c24xx_uart_port *ourport = to_ourport(port);
 
 	if (tx_enabled(port)) {
-		disable_irq_nosync(ourport->tx_irq);
+		if (s3c24xx_serial_has_interrupt_mask(port))
+			__set_bit(S3C64XX_UINTM_TXD,
+				portaddrl(port, S3C64XX_UINTM));
+		else
+			disable_irq_nosync(ourport->tx_irq);
 		tx_enabled(port) = 0;
 		if (port->flags & UPF_CONS_FLOW)
 			s3c24xx_serial_rx_enable(port);
@@ -141,19 +155,26 @@ static void s3c24xx_serial_start_tx(struct uart_port *port)
 		if (port->flags & UPF_CONS_FLOW)
 			s3c24xx_serial_rx_disable(port);
 
-		enable_irq(ourport->tx_irq);
+		if (s3c24xx_serial_has_interrupt_mask(port))
+			__clear_bit(S3C64XX_UINTM_TXD,
+				portaddrl(port, S3C64XX_UINTM));
+		else
+			enable_irq(ourport->tx_irq);
 		tx_enabled(port) = 1;
 	}
 }
 
-
 static void s3c24xx_serial_stop_rx(struct uart_port *port)
 {
 	struct s3c24xx_uart_port *ourport = to_ourport(port);
 
 	if (rx_enabled(port)) {
 		dbg("s3c24xx_serial_stop_rx: port=%p\n", port);
-		disable_irq_nosync(ourport->rx_irq);
+		if (s3c24xx_serial_has_interrupt_mask(port))
+			__set_bit(S3C64XX_UINTM_RXD,
+				portaddrl(port, S3C64XX_UINTM));
+		else
+			disable_irq_nosync(ourport->rx_irq);
 		rx_enabled(port) = 0;
 	}
 }
@@ -320,6 +341,28 @@ static irqreturn_t s3c24xx_serial_tx_chars(int irq, void *id)
 	return IRQ_HANDLED;
 }
 
+/* interrupt handler for s3c64xx and later SoC's.*/
+static irqreturn_t s3c64xx_serial_handle_irq(int irq, void *id)
+{
+	struct s3c24xx_uart_port *ourport = id;
+	struct uart_port *port = &ourport->port;
+	unsigned int pend = rd_regl(port, S3C64XX_UINTP);
+	unsigned long flags;
+	irqreturn_t ret = IRQ_HANDLED;
+
+	spin_lock_irqsave(&port->lock, flags);
+	if (pend & S3C64XX_UINTM_RXD_MSK) {
+		ret = s3c24xx_serial_rx_chars(irq, id);
+		wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_RXD_MSK);
+	}
+	if (pend & S3C64XX_UINTM_TXD_MSK) {
+		ret = s3c24xx_serial_tx_chars(irq, id);
+		wr_regl(port, S3C64XX_UINTP, S3C64XX_UINTM_TXD_MSK);
+	}
+	spin_unlock_irqrestore(&port->lock, flags);
+	return ret;
+}
+
 static unsigned int s3c24xx_serial_tx_empty(struct uart_port *port)
 {
 	struct s3c24xx_uart_info *info = s3c24xx_port_to_info(port);
@@ -377,18 +420,25 @@ static void s3c24xx_serial_shutdown(struct uart_port *port)
 	struct s3c24xx_uart_port *ourport = to_ourport(port);
 
 	if (ourport->tx_claimed) {
-		free_irq(ourport->tx_irq, ourport);
+		if (!s3c24xx_serial_has_interrupt_mask(port))
+			free_irq(ourport->tx_irq, ourport);
 		tx_enabled(port) = 0;
 		ourport->tx_claimed = 0;
 	}
 
 	if (ourport->rx_claimed) {
-		free_irq(ourport->rx_irq, ourport);
+		if (!s3c24xx_serial_has_interrupt_mask(port))
+			free_irq(ourport->rx_irq, ourport);
 		ourport->rx_claimed = 0;
 		rx_enabled(port) = 0;
 	}
-}
 
+	/* Clear pending interrupts and mask all interrupts */
+	if (s3c24xx_serial_has_interrupt_mask(port)) {
+		wr_regl(port, S3C64XX_UINTP, 0xf);
+		wr_regl(port, S3C64XX_UINTM, 0xf);
+	}
+}
 
 static int s3c24xx_serial_startup(struct uart_port *port)
 {
@@ -436,6 +486,33 @@ static int s3c24xx_serial_startup(struct uart_port *port)
 	return ret;
 }
 
+static int s3c64xx_serial_startup(struct uart_port *port)
+{
+	struct s3c24xx_uart_port *ourport = to_ourport(port);
+	int ret;
+
+	dbg("s3c64xx_serial_startup: port=%p (%08lx,%p)\n",
+	    port->mapbase, port->membase);
+
+	ret = request_irq(port->irq, s3c64xx_serial_handle_irq, IRQF_SHARED,
+			  s3c24xx_serial_portname(port), ourport);
+	if (ret) {
+		printk(KERN_ERR "cannot get irq %d\n", port->irq);
+		return ret;
+	}
+
+	/* For compatibility with s3c24xx Soc's */
+	rx_enabled(port) = 1;
+	ourport->rx_claimed = 1;
+	tx_enabled(port) = 0;
+	ourport->tx_claimed = 1;
+
+	/* Enable Rx Interrupt */
+	__clear_bit(S3C64XX_UINTM_RXD, portaddrl(port, S3C64XX_UINTM));
+	dbg("s3c64xx_serial_startup ok\n");
+	return ret;
+}
+
 /* power power management control */
 
 static void s3c24xx_serial_pm(struct uart_port *port, unsigned int level,
@@ -879,7 +956,6 @@ static struct uart_ops s3c24xx_serial_ops = {
 	.verify_port	= s3c24xx_serial_verify_port,
 };
 
-
 static struct uart_driver s3c24xx_uart_drv = {
 	.owner		= THIS_MODULE,
 	.driver_name	= "s3c2410_serial",
@@ -895,7 +971,6 @@ static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS
 		.port = {
 			.lock		= __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[0].port.lock),
 			.iotype		= UPIO_MEM,
-			.irq		= IRQ_S3CUART_RX0,
 			.uartclk	= 0,
 			.fifosize	= 16,
 			.ops		= &s3c24xx_serial_ops,
@@ -907,7 +982,6 @@ static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS
 		.port = {
 			.lock		= __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[1].port.lock),
 			.iotype		= UPIO_MEM,
-			.irq		= IRQ_S3CUART_RX1,
 			.uartclk	= 0,
 			.fifosize	= 16,
 			.ops		= &s3c24xx_serial_ops,
@@ -921,7 +995,6 @@ static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS
 		.port = {
 			.lock		= __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[2].port.lock),
 			.iotype		= UPIO_MEM,
-			.irq		= IRQ_S3CUART_RX2,
 			.uartclk	= 0,
 			.fifosize	= 16,
 			.ops		= &s3c24xx_serial_ops,
@@ -935,7 +1008,6 @@ static struct s3c24xx_uart_port s3c24xx_serial_ports[CONFIG_SERIAL_SAMSUNG_UARTS
 		.port = {
 			.lock		= __SPIN_LOCK_UNLOCKED(s3c24xx_serial_ports[3].port.lock),
 			.iotype		= UPIO_MEM,
-			.irq		= IRQ_S3CUART_RX3,
 			.uartclk	= 0,
 			.fifosize	= 16,
 			.ops		= &s3c24xx_serial_ops,
@@ -1077,6 +1149,10 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
 	port->dev	= &platdev->dev;
 	ourport->info	= info;
 
+	/* Startup sequence is different for s3c64xx and higher SoC's */
+	if (s3c24xx_serial_has_interrupt_mask(port))
+		s3c24xx_serial_ops.startup = s3c64xx_serial_startup;
+
 	/* copy the info in from provided structure */
 	ourport->port.fifosize = info->fifosize;
 
@@ -1116,6 +1192,13 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
 
 	ourport->clk	= clk_get(&platdev->dev, "uart");
 
+	/* Keep all interrupts masked and cleared */
+	if (s3c24xx_serial_has_interrupt_mask(port)) {
+		wr_regl(port, S3C64XX_UINTM, 0xf);
+		wr_regl(port, S3C64XX_UINTP, 0xf);
+		wr_regl(port, S3C64XX_UINTSP, 0xf);
+	}
+
 	dbg("port: map=%08x, mem=%08x, irq=%d (%d,%d), clock=%ld\n",
 	    port->mapbase, port->membase, port->irq,
 	    ourport->rx_irq, ourport->tx_irq, port->uartclk);

drivers/tty/serial/samsung.h

@@ -61,6 +61,7 @@ struct s3c24xx_uart_port {
 /* register access controls */
 
 #define portaddr(port, reg) ((port)->membase + (reg))
+#define portaddrl(port, reg) ((unsigned long *)((port)->membase + (reg)))
 
 #define rd_regb(port, reg) (__raw_readb(portaddr(port, reg)))
 #define rd_regl(port, reg) (__raw_readl(portaddr(port, reg)))

drivers/tty/serial/sb1250-duart.c

@@ -37,6 +37,7 @@
 #include <linux/spinlock.h>
 #include <linux/sysrq.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/types.h>
 
 #include <linux/atomic.h>

drivers/tty/serial/serial_core.c

@@ -57,7 +57,7 @@ static struct lock_class_key port_lock_key;
 
 static void uart_change_speed(struct tty_struct *tty, struct uart_state *state,
 					struct ktermios *old_termios);
-static void __uart_wait_until_sent(struct uart_port *port, int timeout);
+static void uart_wait_until_sent(struct tty_struct *tty, int timeout);
 static void uart_change_pm(struct uart_state *state, int pm_state);
 
 /*
@@ -72,7 +72,7 @@ void uart_write_wakeup(struct uart_port *port)
 	 * closed.  No cookie for you.
 	 */
 	BUG_ON(!state);
-	tasklet_schedule(&state->tlet);
+	tty_wakeup(state->port.tty);
 }
 
 static void uart_stop(struct tty_struct *tty)
@@ -107,12 +107,6 @@ static void uart_start(struct tty_struct *tty)
 	spin_unlock_irqrestore(&port->lock, flags);
 }
 
-static void uart_tasklet_action(unsigned long data)
-{
-	struct uart_state *state = (struct uart_state *)data;
-	tty_wakeup(state->port.tty);
-}
-
 static inline void
 uart_update_mctrl(struct uart_port *port, unsigned int set, unsigned int clear)
 {
@@ -255,9 +249,11 @@ static void uart_shutdown(struct tty_struct *tty, struct uart_state *state)
 	}
 
 	/*
-	 * kill off our tasklet
+	 * It's possible for shutdown to be called after suspend if we get
+	 * a DCD drop (hangup) at just the right time.  Clear suspended bit so
+	 * we don't try to resume a port that has been shutdown.
 	 */
-	tasklet_kill(&state->tlet);
+	clear_bit(ASYNCB_SUSPENDED, &port->flags);
 
 	/*
 	 * Free the transmit buffer page.
@@ -1261,8 +1257,6 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
 	struct uart_port *uport;
 	unsigned long flags;
 
-	BUG_ON(!tty_locked());
-
 	if (!state)
 		return;
 
@@ -1271,12 +1265,11 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
 
 	pr_debug("uart_close(%d) called\n", uport->line);
 
-	mutex_lock(&port->mutex);
 	spin_lock_irqsave(&port->lock, flags);
 
 	if (tty_hung_up_p(filp)) {
 		spin_unlock_irqrestore(&port->lock, flags);
-		goto done;
+		return;
 	}
 
 	if ((tty->count == 1) && (port->count != 1)) {
@@ -1298,7 +1291,7 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
 	}
 	if (port->count) {
 		spin_unlock_irqrestore(&port->lock, flags);
-		goto done;
+		return;
 	}
 
 	/*
@@ -1306,19 +1299,13 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
 	 * the line discipline to only process XON/XOFF characters by
 	 * setting tty->closing.
 	 */
+	set_bit(ASYNCB_CLOSING, &port->flags);
 	tty->closing = 1;
 	spin_unlock_irqrestore(&port->lock, flags);
 
-	if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE) {
-		/*
-		 * hack: open-coded tty_wait_until_sent to avoid
-		 * recursive tty_lock
-		 */
-		long timeout = msecs_to_jiffies(port->closing_wait);
-		if (wait_event_interruptible_timeout(tty->write_wait,
-				!tty_chars_in_buffer(tty), timeout) >= 0)
-			__uart_wait_until_sent(uport, timeout);
-	}
+	if (port->closing_wait != ASYNC_CLOSING_WAIT_NONE)
+		tty_wait_until_sent_from_close(tty,
+				msecs_to_jiffies(port->closing_wait));
 
 	/*
 	 * At this point, we stop accepting input.  To do this, we
@@ -1334,9 +1321,10 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
 		 * has completely drained; this is especially
 		 * important if there is a transmit FIFO!
 		 */
-		__uart_wait_until_sent(uport, uport->timeout);
+		uart_wait_until_sent(tty, uport->timeout);
 	}
 
+	mutex_lock(&port->mutex);
 	uart_shutdown(tty, state);
 	uart_flush_buffer(tty);
 
@@ -1361,15 +1349,18 @@ static void uart_close(struct tty_struct *tty, struct file *filp)
 	 * Wake up anyone trying to open this port.
 	 */
 	clear_bit(ASYNCB_NORMAL_ACTIVE, &port->flags);
+	clear_bit(ASYNCB_CLOSING, &port->flags);
 	spin_unlock_irqrestore(&port->lock, flags);
 	wake_up_interruptible(&port->open_wait);
+	wake_up_interruptible(&port->close_wait);
 
-done:
 	mutex_unlock(&port->mutex);
 }
 
-static void __uart_wait_until_sent(struct uart_port *port, int timeout)
+static void uart_wait_until_sent(struct tty_struct *tty, int timeout)
 {
+	struct uart_state *state = tty->driver_data;
+	struct uart_port *port = state->uart_port;
 	unsigned long char_time, expire;
 
 	if (port->type == PORT_UNKNOWN || port->fifosize == 0)
@@ -1421,16 +1412,6 @@ static void __uart_wait_until_sent(struct uart_port *port, int timeout)
 	}
 }
 
-static void uart_wait_until_sent(struct tty_struct *tty, int timeout)
-{
-	struct uart_state *state = tty->driver_data;
-	struct uart_port *port = state->uart_port;
-
-	tty_lock();
-	__uart_wait_until_sent(port, timeout);
-	tty_unlock();
-}
-
 /*
  * This is called with the BKL held in
  *  linux/drivers/char/tty_io.c:do_tty_hangup()
@@ -1443,7 +1424,6 @@ static void uart_hangup(struct tty_struct *tty)
 	struct tty_port *port = &state->port;
 	unsigned long flags;
 
-	BUG_ON(!tty_locked());
 	pr_debug("uart_hangup(%d)\n", state->uart_port->line);
 
 	mutex_lock(&port->mutex);
@@ -1530,7 +1510,6 @@ static int uart_open(struct tty_struct *tty, struct file *filp)
 	struct tty_port *port;
 	int retval, line = tty->index;
 
-	BUG_ON(!tty_locked());
 	pr_debug("uart_open(%d) called\n", line);
 
 	/*
@@ -2008,6 +1987,8 @@ int uart_resume_port(struct uart_driver *drv, struct uart_port *uport)
 		if (port->tty && port->tty->termios && termios.c_cflag == 0)
 			termios = *(port->tty->termios);
 
+		if (console_suspend_enabled)
+			uart_change_pm(state, 0);
 		uport->ops->set_termios(uport, &termios, NULL);
 		if (console_suspend_enabled)
 			console_start(uport->cons);
@@ -2068,8 +2049,6 @@ uart_report_port(struct uart_driver *drv, struct uart_port *port)
 	case UPIO_MEM32:
 	case UPIO_AU:
 	case UPIO_TSI:
-	case UPIO_DWAPB:
-	case UPIO_DWAPB32:
 		snprintf(address, sizeof(address),
 			 "MMIO 0x%llx", (unsigned long long)port->mapbase);
 		break;
@@ -2298,8 +2277,6 @@ int uart_register_driver(struct uart_driver *drv)
 		port->ops = &uart_port_ops;
 		port->close_delay     = 500;	/* .5 seconds */
 		port->closing_wait    = 30000;	/* 30 seconds */
-		tasklet_init(&state->tlet, uart_tasklet_action,
-			     (unsigned long)state);
 	}
 
 	retval = tty_register_driver(normal);
@@ -2460,11 +2437,6 @@ int uart_remove_one_port(struct uart_driver *drv, struct uart_port *uport)
 	 */
 	uport->type = PORT_UNKNOWN;
 
-	/*
-	 * Kill the tasklet, and free resources.
-	 */
-	tasklet_kill(&state->tlet);
-
 	state->uart_port = NULL;
 	mutex_unlock(&port_mutex);
 
@@ -2489,8 +2461,6 @@ int uart_match_port(struct uart_port *port1, struct uart_port *port2)
 	case UPIO_MEM32:
 	case UPIO_AU:
 	case UPIO_TSI:
-	case UPIO_DWAPB:
-	case UPIO_DWAPB32:
 		return (port1->mapbase == port2->mapbase);
 	}
 	return 0;

drivers/tty/serial/serial_ks8695.c

@@ -13,6 +13,7 @@
  */
 #include <linux/module.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/ioport.h>
 #include <linux/init.h>
 #include <linux/serial.h>
@@ -336,19 +337,19 @@ static int ks8695uart_startup(struct uart_port *port)
 	/*
 	 * Allocate the IRQ
 	 */
-	retval = request_irq(KS8695_IRQ_UART_TX, ks8695uart_tx_chars, IRQF_DISABLED, "UART TX", port);
+	retval = request_irq(KS8695_IRQ_UART_TX, ks8695uart_tx_chars, 0, "UART TX", port);
 	if (retval)
 		goto err_tx;
 
-	retval = request_irq(KS8695_IRQ_UART_RX, ks8695uart_rx_chars, IRQF_DISABLED, "UART RX", port);
+	retval = request_irq(KS8695_IRQ_UART_RX, ks8695uart_rx_chars, 0, "UART RX", port);
 	if (retval)
 		goto err_rx;
 
-	retval = request_irq(KS8695_IRQ_UART_LINE_STATUS, ks8695uart_rx_chars, IRQF_DISABLED, "UART LineStatus", port);
+	retval = request_irq(KS8695_IRQ_UART_LINE_STATUS, ks8695uart_rx_chars, 0, "UART LineStatus", port);
 	if (retval)
 		goto err_ls;
 
-	retval = request_irq(KS8695_IRQ_UART_MODEM_STATUS, ks8695uart_modem_status, IRQF_DISABLED, "UART ModemStatus", port);
+	retval = request_irq(KS8695_IRQ_UART_MODEM_STATUS, ks8695uart_modem_status, 0, "UART ModemStatus", port);
 	if (retval)
 		goto err_ms;
 

drivers/tty/serial/serial_txx9.c

@@ -28,6 +28,8 @@
 #include <linux/pci.h>
 #include <linux/serial_core.h>
 #include <linux/serial.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
 
 #include <asm/io.h>
 

drivers/tty/serial/sh-sci.c

@@ -1976,7 +1976,7 @@ static int __devinit sci_init_single(struct platform_device *dev,
 	 * For the muxed case there's nothing more to do.
 	 */
 	port->irq		= p->irqs[SCIx_RXI_IRQ];
-	port->irqflags		= IRQF_DISABLED;
+	port->irqflags		= 0;
 
 	port->serial_in		= sci_serial_in;
 	port->serial_out	= sci_serial_out;

drivers/tty/serial/sn_console.c

@@ -39,6 +39,7 @@
 
 #include <linux/interrupt.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/serial.h>
 #include <linux/console.h>
 #include <linux/module.h>
@@ -737,7 +738,7 @@ static void __init sn_sal_switch_to_interrupts(struct sn_cons_port *port)
 		DPRINTF("sn_console: switching to interrupt driven console\n");
 
 		if (request_irq(SGI_UART_VECTOR, sn_sal_interrupt,
-				IRQF_DISABLED | IRQF_SHARED,
+				IRQF_SHARED,
 				"SAL console driver", port) >= 0) {
 			spin_lock_irqsave(&port->sc_port.lock, flags);
 			port->sc_port.irq = SGI_UART_VECTOR;

drivers/tty/serial/timbuart.c

@@ -23,6 +23,8 @@
 #include <linux/pci.h>
 #include <linux/interrupt.h>
 #include <linux/serial_core.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/ioport.h>

drivers/tty/serial/uartlite.c

@@ -15,6 +15,7 @@
 #include <linux/serial.h>
 #include <linux/serial_core.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/delay.h>
 #include <linux/interrupt.h>
 #include <linux/init.h>

drivers/tty/serial/ucc_uart.c

@@ -20,8 +20,10 @@
 
 #include <linux/module.h>
 #include <linux/serial.h>
-#include <linux/slab.h>
 #include <linux/serial_core.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/io.h>
 #include <linux/of_platform.h>
 #include <linux/dma-mapping.h>

drivers/tty/serial/xilinx_uartps.c

@@ -12,9 +12,11 @@
  */
 
 #include <linux/platform_device.h>
+#include <linux/serial.h>
 #include <linux/serial_core.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/console.h>
-#include <linux/serial.h>
 #include <linux/irq.h>
 #include <linux/io.h>
 #include <linux/of.h>

drivers/tty/serial/zs.c

@@ -63,6 +63,7 @@
 #include <linux/spinlock.h>
 #include <linux/sysrq.h>
 #include <linux/tty.h>
+#include <linux/tty_flip.h>
 #include <linux/types.h>
 
 #include <linux/atomic.h>

drivers/tty/synclink.c

@@ -2124,7 +2124,6 @@ static int mgsl_write(struct tty_struct * tty,
 	if ( info->params.mode == MGSL_MODE_HDLC ||
 			info->params.mode == MGSL_MODE_RAW ) {
 		/* operating in synchronous (frame oriented) mode */
-		/* operating in synchronous (frame oriented) mode */
 		if (info->tx_active) {
 
 			if ( info->params.mode == MGSL_MODE_HDLC ) {

drivers/tty/synclinkmp.c

@@ -4950,7 +4950,7 @@ CheckAgain:
 
 	if ( debug_level >= DEBUG_LEVEL_DATA )
 		trace_block(info,info->rx_buf_list_ex[StartIndex].virt_addr,
-			min_t(int, framesize,SCABUFSIZE),0);
+			min_t(unsigned int, framesize, SCABUFSIZE), 0);
 
 	if (framesize) {
 		if (framesize > info->max_frame_size)
@@ -5015,14 +5015,14 @@ static void tx_load_dma_buffer(SLMP_INFO *info, const char *buf, unsigned int co
 	SCADESC_EX *desc_ex;
 
 	if ( debug_level >= DEBUG_LEVEL_DATA )
-		trace_block(info,buf, min_t(int, count,SCABUFSIZE), 1);
+		trace_block(info, buf, min_t(unsigned int, count, SCABUFSIZE), 1);
 
 	/* Copy source buffer to one or more DMA buffers, starting with
 	 * the first transmit dma buffer.
 	 */
 	for(i=0;;)
 	{
-		copy_count = min_t(unsigned short,count,SCABUFSIZE);
+		copy_count = min_t(unsigned int, count, SCABUFSIZE);
 
 		desc = &info->tx_buf_list[i];
 		desc_ex = &info->tx_buf_list_ex[i];

drivers/tty/tty_io.c

@@ -194,8 +194,7 @@ static inline struct tty_struct *file_tty(struct file *file)
 	return ((struct tty_file_private *)file->private_data)->tty;
 }
 
-/* Associate a new file with the tty structure */
-int tty_add_file(struct tty_struct *tty, struct file *file)
+int tty_alloc_file(struct file *file)
 {
 	struct tty_file_private *priv;
 
@@ -203,15 +202,36 @@ int tty_add_file(struct tty_struct *tty, struct file *file)
 	if (!priv)
 		return -ENOMEM;
 
+	file->private_data = priv;
+
+	return 0;
+}
+
+/* Associate a new file with the tty structure */
+void tty_add_file(struct tty_struct *tty, struct file *file)
+{
+	struct tty_file_private *priv = file->private_data;
+
 	priv->tty = tty;
 	priv->file = file;
-	file->private_data = priv;
 
 	spin_lock(&tty_files_lock);
 	list_add(&priv->list, &tty->tty_files);
 	spin_unlock(&tty_files_lock);
+}
 
-	return 0;
+/**
+ * tty_free_file - free file->private_data
+ *
+ * This shall be used only for fail path handling when tty_add_file was not
+ * called yet.
+ */
+void tty_free_file(struct file *file)
+{
+	struct tty_file_private *priv = file->private_data;
+
+	file->private_data = NULL;
+	kfree(priv);
 }
 
 /* Delete file from its tty */
@@ -222,8 +242,7 @@ void tty_del_file(struct file *file)
 	spin_lock(&tty_files_lock);
 	list_del(&priv->list);
 	spin_unlock(&tty_files_lock);
-	file->private_data = NULL;
-	kfree(priv);
+	tty_free_file(file);
 }
 
 
@@ -1811,6 +1830,10 @@ static int tty_open(struct inode *inode, struct file *filp)
 	nonseekable_open(inode, filp);
 
 retry_open:
+	retval = tty_alloc_file(filp);
+	if (retval)
+		return -ENOMEM;
+
 	noctty = filp->f_flags & O_NOCTTY;
 	index  = -1;
 	retval = 0;
@@ -1823,6 +1846,7 @@ retry_open:
 		if (!tty) {
 			tty_unlock();
 			mutex_unlock(&tty_mutex);
+			tty_free_file(filp);
 			return -ENXIO;
 		}
 		driver = tty_driver_kref_get(tty->driver);
@@ -1855,6 +1879,7 @@ retry_open:
 		}
 		tty_unlock();
 		mutex_unlock(&tty_mutex);
+		tty_free_file(filp);
 		return -ENODEV;
 	}
 
@@ -1862,6 +1887,7 @@ retry_open:
 	if (!driver) {
 		tty_unlock();
 		mutex_unlock(&tty_mutex);
+		tty_free_file(filp);
 		return -ENODEV;
 	}
 got_driver:
@@ -1872,6 +1898,8 @@ got_driver:
 		if (IS_ERR(tty)) {
 			tty_unlock();
 			mutex_unlock(&tty_mutex);
+			tty_driver_kref_put(driver);
+			tty_free_file(filp);
 			return PTR_ERR(tty);
 		}
 	}
@@ -1887,15 +1915,11 @@ got_driver:
 	tty_driver_kref_put(driver);
 	if (IS_ERR(tty)) {
 		tty_unlock();
+		tty_free_file(filp);
 		return PTR_ERR(tty);
 	}
 
-	retval = tty_add_file(tty, filp);
-	if (retval) {
-		tty_unlock();
-		tty_release(inode, filp);
-		return retval;
-	}
+	tty_add_file(tty, filp);
 
 	check_tty_count(tty, "tty_open");
 	if (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
@@ -2716,6 +2740,8 @@ static long tty_compat_ioctl(struct file *file, unsigned int cmd,
 	ld = tty_ldisc_ref_wait(tty);
 	if (ld->ops->compat_ioctl)
 		retval = ld->ops->compat_ioctl(tty, file, cmd, arg);
+	else
+		retval = n_tty_compat_ioctl_helper(tty, file, cmd, arg);
 	tty_ldisc_deref(ld);
 
 	return retval;

drivers/tty/tty_ioctl.c

@@ -19,6 +19,7 @@
 #include <linux/module.h>
 #include <linux/bitops.h>
 #include <linux/mutex.h>
+#include <linux/compat.h>
 
 #include <asm/io.h>
 #include <asm/uaccess.h>
@@ -1179,3 +1180,19 @@ int n_tty_ioctl_helper(struct tty_struct *tty, struct file *file,
 	}
 }
 EXPORT_SYMBOL(n_tty_ioctl_helper);
+
+#ifdef CONFIG_COMPAT
+long n_tty_compat_ioctl_helper(struct tty_struct *tty, struct file *file,
+					unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case TIOCGLCKTRMIOS:
+	case TIOCSLCKTRMIOS:
+		return tty_mode_ioctl(tty, file, cmd, (unsigned long) compat_ptr(arg));
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+EXPORT_SYMBOL(n_tty_compat_ioctl_helper);
+#endif
+

drivers/tty/tty_ldisc.c

@@ -450,7 +450,6 @@ static int tty_ldisc_open(struct tty_struct *tty, struct tty_ldisc *ld)
 	if (ld->ops->open) {
 		int ret;
                 /* BTM here locks versus a hangup event */
-		WARN_ON(!tty_locked());
 		ret = ld->ops->open(tty);
 		if (ret)
 			clear_bit(TTY_LDISC_OPEN, &tty->flags);

drivers/tty/tty_mutex.c

@@ -15,30 +15,18 @@
  * Don't use in new code.
  */
 static DEFINE_MUTEX(big_tty_mutex);
-struct task_struct *__big_tty_mutex_owner;
-EXPORT_SYMBOL_GPL(__big_tty_mutex_owner);
 
 /*
  * Getting the big tty mutex.
  */
 void __lockfunc tty_lock(void)
 {
-	struct task_struct *task = current;
-
-	WARN_ON(__big_tty_mutex_owner == task);
-
 	mutex_lock(&big_tty_mutex);
-	__big_tty_mutex_owner = task;
 }
 EXPORT_SYMBOL(tty_lock);
 
 void __lockfunc tty_unlock(void)
 {
-	struct task_struct *task = current;
-
-	WARN_ON(__big_tty_mutex_owner != task);
-	__big_tty_mutex_owner = NULL;
-
 	mutex_unlock(&big_tty_mutex);
 }
 EXPORT_SYMBOL(tty_unlock);