[ARM] pxa: move IRQ handling of GPIO 0 and 1 outside of gpio.c

This is part of the work making gpio.c generic enough, the changes
include:

1. move IRQ handling of GPIO 0 and 1 outside (and back into irq.c)

2. pxa_init_gpio() accepts a range for muxed GPIO IRQs, and an IRQ
   number for the muxed GPIOs

3. __gpio_is_occupied() and __gpio_is_inverted() are made inline,
   and are moved into <mach/gpio.h> instead of generic gpio.c

Signed-off-by: Eric Miao <eric.miao@marvell.com>

arch/arm/mach-pxa/generic.h

@@ -9,13 +9,11 @@
  * published by the Free Software Foundation.
  */
 
-typedef int (*set_wake_t)(unsigned int, unsigned int);
-
 struct sys_timer;
 
 extern struct sys_timer pxa_timer;
-extern void __init pxa_init_irq(int irq_nr, set_wake_t fn);
-extern void __init pxa_init_gpio(int gpio_nr, set_wake_t fn);
+extern void __init pxa_init_irq(int irq_nr,
+				int (*set_wake)(unsigned int, unsigned int));
 extern void __init pxa25x_init_irq(void);
 extern void __init pxa27x_init_irq(void);
 extern void __init pxa3xx_init_irq(void);

arch/arm/mach-pxa/gpio.c

@@ -45,18 +45,6 @@ struct pxa_gpio_chip {
 
 int pxa_last_gpio;
 
-#ifdef CONFIG_CPU_PXA26x
-/* GPIO86/87/88/89 on PXA26x have their direction bits in GPDR2 inverted,
- * as well as their Alternate Function value being '1' for GPIO in GAFRx.
- */
-static int __gpio_is_inverted(unsigned gpio)
-{
-	return cpu_is_pxa25x() && gpio > 85;
-}
-#else
-#define __gpio_is_inverted(gpio)	(0)
-#endif
-
 /*
  * Configure pins for GPIO or other functions
  */
@@ -185,6 +173,20 @@ static struct pxa_gpio_chip pxa_gpio_chip[] = {
 #endif
 };
 
+static void __init pxa_init_gpio_chip(int gpio_nr)
+{
+	int i, gpio;
+
+	/* add a GPIO chip for each register bank.
+	 * the last PXA25x register only contains 21 GPIOs
+	 */
+	for (gpio = 0, i = 0; gpio < gpio_nr; gpio += 32, i++) {
+		if (gpio + 32 > gpio_nr)
+			pxa_gpio_chip[i].chip.ngpio = gpio_nr - gpio;
+		gpiochip_add(&pxa_gpio_chip[i].chip);
+	}
+}
+
 /*
  * PXA GPIO edge detection for IRQs:
  * IRQs are generated on Falling-Edge, Rising-Edge, or both.
@@ -195,27 +197,6 @@ static unsigned long GPIO_IRQ_rising_edge[4];
 static unsigned long GPIO_IRQ_falling_edge[4];
 static unsigned long GPIO_IRQ_mask[4];
 
-/*
- * On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate
- * function of a GPIO, and GPDRx cannot be altered once configured. It
- * is attributed as "occupied" here (I know this terminology isn't
- * accurate, you are welcome to propose a better one :-)
- */
-static int __gpio_is_occupied(unsigned gpio)
-{
-	if (cpu_is_pxa27x() || cpu_is_pxa25x()) {
-		int af = (GAFR(gpio) >> ((gpio & 0xf) * 2)) & 0x3;
-		int dir = GPDR(gpio) & GPIO_bit(gpio);
-
-		if (__gpio_is_inverted(gpio))
-			return af != 1 || dir == 0;
-		else
-			return af != 0 || dir != 0;
-	}
-
-	return 0;
-}
-
 static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
 {
 	int gpio, idx;
@@ -261,33 +242,6 @@ static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
 	return 0;
 }
 
-/*
- * GPIO IRQs must be acknowledged.  This is for GPIO 0 and 1.
- */
-
-static void pxa_ack_low_gpio(unsigned int irq)
-{
-	GEDR0 = (1 << (irq - IRQ_GPIO0));
-}
-
-static void pxa_mask_low_gpio(unsigned int irq)
-{
-	ICMR &= ~(1 << (irq - PXA_IRQ(0)));
-}
-
-static void pxa_unmask_low_gpio(unsigned int irq)
-{
-	ICMR |= 1 << (irq - PXA_IRQ(0));
-}
-
-static struct irq_chip pxa_low_gpio_chip = {
-	.name		= "GPIO-l",
-	.ack		= pxa_ack_low_gpio,
-	.mask		= pxa_mask_low_gpio,
-	.unmask		= pxa_unmask_low_gpio,
-	.set_type	= pxa_gpio_irq_type,
-};
-
 /*
  * Demux handler for GPIO>=2 edge detect interrupts
  */
@@ -352,48 +306,31 @@ static struct irq_chip pxa_muxed_gpio_chip = {
 	.set_type	= pxa_gpio_irq_type,
 };
 
-void __init pxa_init_gpio(int gpio_nr, set_wake_t fn)
+void __init pxa_init_gpio(int mux_irq, int start, int end, set_wake_t fn)
 {
-	int irq, i, gpio;
+	int irq, i;
 
-	pxa_last_gpio = gpio_nr - 1;
+	pxa_last_gpio = end;
 
 	/* clear all GPIO edge detects */
-	for (i = 0; i < gpio_nr; i += 32) {
-		GFER(i) = 0;
-		GRER(i) = 0;
-		GEDR(i) = GEDR(i);
+	for (i = start; i <= end; i += 32) {
+		GFER(i) &= ~GPIO_IRQ_mask[i];
+		GRER(i) &= ~GPIO_IRQ_mask[i];
+		GEDR(i) = GPIO_IRQ_mask[i];
 	}
 
-	/* GPIO 0 and 1 must have their mask bit always set */
-	GPIO_IRQ_mask[0] = 3;
-
-	for (irq = IRQ_GPIO0; irq <= IRQ_GPIO1; irq++) {
-		set_irq_chip(irq, &pxa_low_gpio_chip);
-		set_irq_handler(irq, handle_edge_irq);
-		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
-	}
-
-	for (irq = IRQ_GPIO(2); irq < IRQ_GPIO(gpio_nr); irq++) {
+	for (irq  = gpio_to_irq(start); irq <= gpio_to_irq(end); irq++) {
 		set_irq_chip(irq, &pxa_muxed_gpio_chip);
 		set_irq_handler(irq, handle_edge_irq);
 		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
 	}
 
 	/* Install handler for GPIO>=2 edge detect interrupts */
-	set_irq_chained_handler(IRQ_GPIO_2_x, pxa_gpio_demux_handler);
-
-	pxa_low_gpio_chip.set_wake = fn;
+	set_irq_chained_handler(mux_irq, pxa_gpio_demux_handler);
 	pxa_muxed_gpio_chip.set_wake = fn;
 
-	/* add a GPIO chip for each register bank.
-	 * the last PXA25x register only contains 21 GPIOs
-	 */
-	for (gpio = 0, i = 0; gpio < gpio_nr; gpio += 32, i++) {
-		if (gpio + 32 > gpio_nr)
-			pxa_gpio_chip[i].chip.ngpio = gpio_nr - gpio;
-		gpiochip_add(&pxa_gpio_chip[i].chip);
-	}
+	/* Initialize GPIO chips */
+	pxa_init_gpio_chip(end + 1);
 }
 
 #ifdef CONFIG_PM

arch/arm/mach-pxa/include/mach/gpio.h

@@ -56,10 +56,44 @@ static inline void gpio_set_value(unsigned gpio, int value)
 	}
 }
 
-#define gpio_cansleep __gpio_cansleep
-
+#define gpio_cansleep		__gpio_cansleep
 #define gpio_to_irq(gpio)	IRQ_GPIO(gpio)
 #define irq_to_gpio(irq)	IRQ_TO_GPIO(irq)
 
 
+#ifdef CONFIG_CPU_PXA26x
+/* GPIO86/87/88/89 on PXA26x have their direction bits in GPDR2 inverted,
+ * as well as their Alternate Function value being '1' for GPIO in GAFRx.
+ */
+static inline int __gpio_is_inverted(unsigned gpio)
+{
+	return cpu_is_pxa25x() && gpio > 85;
+}
+#else
+static inline int __gpio_is_inverted(unsigned gpio) { return 0; }
+#endif
+
+/*
+ * On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate
+ * function of a GPIO, and GPDRx cannot be altered once configured. It
+ * is attributed as "occupied" here (I know this terminology isn't
+ * accurate, you are welcome to propose a better one :-)
+ */
+static inline int __gpio_is_occupied(unsigned gpio)
+{
+	if (cpu_is_pxa27x() || cpu_is_pxa25x()) {
+		int af = (GAFR(gpio) >> ((gpio & 0xf) * 2)) & 0x3;
+		int dir = GPDR(gpio) & GPIO_bit(gpio);
+
+		if (__gpio_is_inverted(gpio))
+			return af != 1 || dir == 0;
+		else
+			return af != 0 || dir != 0;
+	} else
+		return GPDR(gpio) & GPIO_bit(gpio);
+}
+
+typedef int (*set_wake_t)(unsigned int irq, unsigned int on);
+
+extern void pxa_init_gpio(int mux_irq, int start, int end, set_wake_t fn);
 #endif

arch/arm/mach-pxa/irq.c

@@ -21,6 +21,7 @@
 #include <asm/irq.h>
 #include <asm/mach/irq.h>
 #include <mach/pxa-regs.h>
+#include <mach/gpio.h>
 
 #include "generic.h"
 
@@ -51,6 +52,72 @@ static struct irq_chip pxa_internal_irq_chip = {
 	.unmask		= pxa_unmask_irq,
 };
 
+/*
+ * GPIO IRQs for GPIO 0 and 1
+ */
+static int pxa_set_low_gpio_type(unsigned int irq, unsigned int type)
+{
+	int gpio = irq - IRQ_GPIO0;
+
+	if (__gpio_is_occupied(gpio)) {
+		pr_err("%s failed: GPIO is configured\n", __func__);
+		return -EINVAL;
+	}
+
+	if (type & IRQ_TYPE_EDGE_RISING)
+		GRER0 |= GPIO_bit(gpio);
+	else
+		GRER0 &= ~GPIO_bit(gpio);
+
+	if (type & IRQ_TYPE_EDGE_FALLING)
+		GFER0 |= GPIO_bit(gpio);
+	else
+		GFER0 &= ~GPIO_bit(gpio);
+
+	return 0;
+}
+
+static void pxa_ack_low_gpio(unsigned int irq)
+{
+	GEDR0 = (1 << (irq - IRQ_GPIO0));
+}
+
+static void pxa_mask_low_gpio(unsigned int irq)
+{
+	ICMR &= ~(1 << (irq - PXA_IRQ(0)));
+}
+
+static void pxa_unmask_low_gpio(unsigned int irq)
+{
+	ICMR |= 1 << (irq - PXA_IRQ(0));
+}
+
+static struct irq_chip pxa_low_gpio_chip = {
+	.name		= "GPIO-l",
+	.ack		= pxa_ack_low_gpio,
+	.mask		= pxa_mask_low_gpio,
+	.unmask		= pxa_unmask_low_gpio,
+	.set_type	= pxa_set_low_gpio_type,
+};
+
+static void __init pxa_init_low_gpio_irq(set_wake_t fn)
+{
+	int irq;
+
+	/* clear edge detection on GPIO 0 and 1 */
+	GFER0 &= ~0x3;
+	GRER0 &= ~0x3;
+	GEDR0 = 0x3;
+
+	for (irq = IRQ_GPIO0; irq <= IRQ_GPIO1; irq++) {
+		set_irq_chip(irq, &pxa_low_gpio_chip);
+		set_irq_handler(irq, handle_edge_irq);
+		set_irq_flags(irq, IRQF_VALID);
+	}
+
+	pxa_low_gpio_chip.set_wake = fn;
+}
+
 void __init pxa_init_irq(int irq_nr, set_wake_t fn)
 {
 	int irq;
@@ -72,6 +139,7 @@ void __init pxa_init_irq(int irq_nr, set_wake_t fn)
 	}
 
 	pxa_internal_irq_chip.set_wake = fn;
+	pxa_init_low_gpio_irq(fn);
 }
 
 #ifdef CONFIG_PM

arch/arm/mach-pxa/pxa25x.c

@@ -25,6 +25,7 @@
 
 #include <mach/hardware.h>
 #include <mach/irqs.h>
+#include <mach/gpio.h>
 #include <mach/pxa25x.h>
 #include <mach/reset.h>
 #include <mach/pm.h>
@@ -308,14 +309,14 @@ set_pwer:
 void __init pxa25x_init_irq(void)
 {
 	pxa_init_irq(32, pxa25x_set_wake);
-	pxa_init_gpio(85, pxa25x_set_wake);
+	pxa_init_gpio(IRQ_GPIO_2_x, 2, 84, pxa25x_set_wake);
 }
 
 #ifdef CONFIG_CPU_PXA26x
 void __init pxa26x_init_irq(void)
 {
 	pxa_init_irq(32, pxa25x_set_wake);
-	pxa_init_gpio(90, pxa25x_set_wake);
+	pxa_init_gpio(IRQ_GPIO_2_x, 2, 89, pxa25x_set_wake);
 }
 #endif
 

arch/arm/mach-pxa/pxa27x.c

@@ -21,6 +21,7 @@
 #include <mach/hardware.h>
 #include <asm/irq.h>
 #include <mach/irqs.h>
+#include <mach/gpio.h>
 #include <mach/pxa27x.h>
 #include <mach/reset.h>
 #include <mach/ohci.h>
@@ -330,7 +331,7 @@ static int pxa27x_set_wake(unsigned int irq, unsigned int on)
 void __init pxa27x_init_irq(void)
 {
 	pxa_init_irq(34, pxa27x_set_wake);
-	pxa_init_gpio(121, pxa27x_set_wake);
+	pxa_init_gpio(IRQ_GPIO_2_x, 2, 120, pxa27x_set_wake);
 }
 
 /*

arch/arm/mach-pxa/pxa3xx.c

@@ -23,6 +23,7 @@
 #include <linux/sysdev.h>
 
 #include <mach/hardware.h>
+#include <mach/gpio.h>
 #include <mach/pxa3xx-regs.h>
 #include <mach/reset.h>
 #include <mach/ohci.h>
@@ -538,7 +539,7 @@ void __init pxa3xx_init_irq(void)
 	__asm__ __volatile__("mcr p15, 0, %0, c15, c1, 0\n": :"r"(value));
 
 	pxa_init_irq(56, pxa3xx_set_wake);
-	pxa_init_gpio(128, NULL);
+	pxa_init_gpio(IRQ_GPIO_2_x, 2, 127, NULL);
 }
 
 /*