[ARM] 3098/1: pxa2xx disable ssp irq

Patch from Liam Girdwood

This patch allows users of the pxa SSP driver to register their own irq
handlers instead of using the default SSP handler. It also cleans up the
CKEN clock and irq detection as the values are now stored in a table.

This patch replaces 2845/1

Changes:-
o Added flags parameter to ssp_init()
o Added SSP_NO_IRQ flag to disable registering of ssp irq handler (for
drivers that want to register their own handler)
o Cleaned up clock and irq detection, values are now stored in table.
o Added build changes to allow other drivers (e.g audio) to select the
ssp driver.
o corgi_ssp.c changed to use new interface.

Signed-off-by: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mach-pxa/Kconfig

@@ -60,6 +60,7 @@ config MACH_CORGI
 	bool "Enable Sharp SL-C700 (Corgi) Support"
 	depends PXA_SHARPSL_25x
 	select PXA_SHARP_C7xx
+	select PXA_SSP
 
 config MACH_SHEPHERD
 	bool "Enable Sharp SL-C750 (Shepherd) Support"
@@ -102,12 +103,18 @@ config IWMMXT
 
 config PXA_SHARP_C7xx
 	bool
+	select PXA_SSP
 	help
 	  Enable support for all Sharp C7xx models
 
 config PXA_SHARP_Cxx00
 	bool
+	select PXA_SSP
 	help
 	  Enable common support for Sharp Cxx00 models
 
+config PXA_SSP
+	tristate
+	help
+	  Enable support for PXA2xx SSP ports
 endif

arch/arm/mach-pxa/Makefile

@@ -11,8 +11,8 @@ obj-$(CONFIG_PXA27x) += pxa27x.o
 obj-$(CONFIG_ARCH_LUBBOCK) += lubbock.o
 obj-$(CONFIG_MACH_MAINSTONE) += mainstone.o
 obj-$(CONFIG_ARCH_PXA_IDP) += idp.o
-obj-$(CONFIG_PXA_SHARP_C7xx)	+= corgi.o corgi_ssp.o corgi_lcd.o ssp.o
-obj-$(CONFIG_PXA_SHARP_Cxx00)	+= spitz.o corgi_ssp.o corgi_lcd.o ssp.o
+obj-$(CONFIG_PXA_SHARP_C7xx)	+= corgi.o corgi_ssp.o corgi_lcd.o
+obj-$(CONFIG_PXA_SHARP_Cxx00)	+= spitz.o corgi_ssp.o corgi_lcd.o
 obj-$(CONFIG_MACH_POODLE)	+= poodle.o
 obj-$(CONFIG_MACH_TOSA)         += tosa.o
 
@@ -26,6 +26,7 @@ obj-$(CONFIG_LEDS) += $(led-y)
 
 # Misc features
 obj-$(CONFIG_PM) += pm.o sleep.o
+obj-$(CONFIG_PXA_SSP) += ssp.o
 
 ifeq ($(CONFIG_PXA27x),y)
 obj-$(CONFIG_PM) += standby.o

arch/arm/mach-pxa/corgi_ssp.c

@@ -203,7 +203,7 @@ static int __init corgi_ssp_probe(struct device *dev)
 	GPDR(ssp_machinfo->cs_ads7846) |= GPIO_bit(ssp_machinfo->cs_ads7846);  /* output */
 	GPSR(ssp_machinfo->cs_ads7846) = GPIO_bit(ssp_machinfo->cs_ads7846);   /* High - Disable ADS7846*/
 
-	ret = ssp_init(&corgi_ssp_dev,ssp_machinfo->port);
+	ret = ssp_init(&corgi_ssp_dev, ssp_machinfo->port, 0);
 
 	if (ret)
 		printk(KERN_ERR "Unable to register SSP handler!\n");

arch/arm/mach-pxa/ssp.c

@@ -19,6 +19,8 @@
  *   22nd Aug 2003 Initial version.
  *   20th Dec 2004 Added ssp_config for changing port config without
  *                 closing the port.
+ *    4th Aug 2005 Added option to disable irq handler registration and
+ *                 cleaned up irq and clock detection.
  */
 
 #include <linux/module.h>
@@ -37,6 +39,26 @@
 
 #define PXA_SSP_PORTS 	3
 
+struct ssp_info_ {
+	int irq;
+	u32 clock;
+};
+
+/*
+ * SSP port clock and IRQ settings
+ */
+static const struct ssp_info_ ssp_info[PXA_SSP_PORTS] = {
+#if defined (CONFIG_PXA27x)
+	{IRQ_SSP,	CKEN23_SSP1},
+	{IRQ_SSP2,	CKEN3_SSP2},
+	{IRQ_SSP3,	CKEN4_SSP3},
+#else
+	{IRQ_SSP,	CKEN3_SSP},
+	{IRQ_NSSP,	CKEN9_NSSP},
+	{IRQ_ASSP,	CKEN10_ASSP},
+#endif
+};
+
 static DECLARE_MUTEX(sem);
 static int use_count[PXA_SSP_PORTS] = {0, 0, 0};
 
@@ -210,9 +232,9 @@ int ssp_config(struct ssp_dev *dev, u32 mode, u32 flags, u32 psp_flags, u32 spee
  *   %-EBUSY	if the resources are already in use
  *   %0		on success
  */
-int ssp_init(struct ssp_dev *dev, u32 port)
+int ssp_init(struct ssp_dev *dev, u32 port, u32 init_flags)
 {
-	int ret, irq;
+	int ret;
 
 	if (port > PXA_SSP_PORTS || port == 0)
 		return -ENODEV;
@@ -229,61 +251,20 @@ int ssp_init(struct ssp_dev *dev, u32 port)
 		up(&sem);
 		return -EBUSY;
 	}
-
-	switch (port) {
-		case 1:
-			irq = IRQ_SSP;
-			break;
-#if defined (CONFIG_PXA27x)
-		case 2:
-			irq = IRQ_SSP2;
-			break;
-		case 3:
-			irq = IRQ_SSP3;
-			break;
-#else
-		case 2:
-			irq = IRQ_NSSP;
-			break;
-		case 3:
-			irq = IRQ_ASSP;
-			break;
-#endif
-		default:
-			return -ENODEV;
-	}
-
 	dev->port = port;
 
-	ret = request_irq(irq, ssp_interrupt, 0, "SSP", dev);
-	if (ret)
-		goto out_region;
+	/* do we need to get irq */
+	if (!(init_flags & SSP_NO_IRQ)) {
+		ret = request_irq(ssp_info[port-1].irq, ssp_interrupt,
+				0, "SSP", dev);
+	    	if (ret)
+			goto out_region;
+	    	dev->irq = ssp_info[port-1].irq;
+	} else
+		dev->irq = 0;
 
 	/* turn on SSP port clock */
-	switch (dev->port) {
-#if defined (CONFIG_PXA27x)
-		case 1:
-			pxa_set_cken(CKEN23_SSP1, 1);
-			break;
-		case 2:
-			pxa_set_cken(CKEN3_SSP2, 1);
-			break;
-		case 3:
-			pxa_set_cken(CKEN4_SSP3, 1);
-			break;
-#else
-		case 1:
-			pxa_set_cken(CKEN3_SSP, 1);
-			break;
-		case 2:
-			pxa_set_cken(CKEN9_NSSP, 1);
-			break;
-		case 3:
-			pxa_set_cken(CKEN10_ASSP, 1);
-			break;
-#endif
-	}
-
+	pxa_set_cken(ssp_info[port-1].clock, 1);
 	up(&sem);
 	return 0;
 
@@ -301,46 +282,17 @@ out_region:
  */
 void ssp_exit(struct ssp_dev *dev)
 {
-	int irq;
-
 	down(&sem);
 	SSCR0_P(dev->port) &= ~SSCR0_SSE;
 
-	/* find irq, save power and turn off SSP port clock */
-	switch (dev->port) {
-#if defined (CONFIG_PXA27x)
-		case 1:
-			irq = IRQ_SSP;
-			pxa_set_cken(CKEN23_SSP1, 0);
-			break;
-		case 2:
-			irq = IRQ_SSP2;
-			pxa_set_cken(CKEN3_SSP2, 0);
-			break;
-		case 3:
-			irq = IRQ_SSP3;
-			pxa_set_cken(CKEN4_SSP3, 0);
-			break;
-#else
-		case 1:
-			irq = IRQ_SSP;
-			pxa_set_cken(CKEN3_SSP, 0);
-			break;
-		case 2:
-			irq = IRQ_NSSP;
-			pxa_set_cken(CKEN9_NSSP, 0);
-			break;
-		case 3:
-			irq = IRQ_ASSP;
-			pxa_set_cken(CKEN10_ASSP, 0);
-			break;
-#endif
-		default:
-			printk(KERN_WARNING "SSP: tried to close invalid port\n");
-			return;
+    	if (dev->port > PXA_SSP_PORTS || dev->port == 0) {
+		printk(KERN_WARNING "SSP: tried to close invalid port\n");
+		return;
 	}
 
-	free_irq(irq, dev);
+	pxa_set_cken(ssp_info[dev->port-1].clock, 0);
+	if (dev->irq)
+		free_irq(dev->irq, dev);
 	release_mem_region(__PREG(SSCR0_P(dev->port)), 0x2c);
 	use_count[dev->port - 1]--;
 	up(&sem);

include/asm-arm/arch-pxa/ssp.h

@@ -18,6 +18,11 @@
 #ifndef SSP_H
 #define SSP_H
 
+/*
+ * SSP initialisation flags
+ */
+#define SSP_NO_IRQ	0x1		/* don't register an irq handler in SSP driver */
+
 struct ssp_state {
 	u32	cr0;
 	u32 cr1;
@@ -31,6 +36,7 @@ struct ssp_dev {
 	u32 flags;
 	u32 psp_flags;
 	u32 speed;
+	int irq;
 };
 
 int ssp_write_word(struct ssp_dev *dev, u32 data);
@@ -40,7 +46,7 @@ void ssp_enable(struct ssp_dev *dev);
 void ssp_disable(struct ssp_dev *dev);
 void ssp_save_state(struct ssp_dev *dev, struct ssp_state *ssp);
 void ssp_restore_state(struct ssp_dev *dev, struct ssp_state *ssp);
-int ssp_init(struct ssp_dev *dev, u32 port);
+int ssp_init(struct ssp_dev *dev, u32 port, u32 init_flags);
 int ssp_config(struct ssp_dev *dev, u32 mode, u32 flags, u32 psp_flags, u32 speed);
 void ssp_exit(struct ssp_dev *dev);