path: root/target/linux/brcm47xx/patches-3.6/502-bcm47xx-rewrite-gpio-handling.patch

--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -101,6 +101,7 @@ config ATH79
 
 config BCM47XX
 	bool "Broadcom BCM47XX based boards"
+	select ARCH_REQUIRE_GPIOLIB
 	select BOOT_RAW
 	select CEVT_R4K
 	select CSRC_R4K
@@ -110,7 +111,6 @@ config BCM47XX
 	select NO_EXCEPT_FILL
 	select SYS_SUPPORTS_32BIT_KERNEL
 	select SYS_SUPPORTS_LITTLE_ENDIAN
-	select GENERIC_GPIO
 	select CFE
 	help
 	 Support for BCM47XX based boards
--- a/arch/mips/bcm47xx/gpio.c
+++ b/arch/mips/bcm47xx/gpio.c
@@ -4,83 +4,154 @@
  * for more details.
  *
  * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
+ * Copyright (C) 2012 Hauke Mehrtens <hauke@hauke-m.de>
+ *
+ * Parts of this file are based on Atheros AR71XX/AR724X/AR913X GPIO
  */
 
 #include <linux/export.h>
+#include <linux/gpio.h>
 #include <linux/ssb/ssb.h>
-#include <linux/ssb/ssb_driver_chipcommon.h>
-#include <linux/ssb/ssb_driver_extif.h>
-#include <asm/mach-bcm47xx/bcm47xx.h>
-#include <asm/mach-bcm47xx/gpio.h>
+#include <linux/ssb/ssb_embedded.h>
+#include <linux/bcma/bcma.h>
+
+#include <bcm47xx.h>
 
-#if (BCM47XX_CHIPCO_GPIO_LINES > BCM47XX_EXTIF_GPIO_LINES)
-static DECLARE_BITMAP(gpio_in_use, BCM47XX_CHIPCO_GPIO_LINES);
-#else
-static DECLARE_BITMAP(gpio_in_use, BCM47XX_EXTIF_GPIO_LINES);
-#endif
 
-int gpio_request(unsigned gpio, const char *tag)
+static unsigned long bcm47xx_gpio_count;
+
+/* low level BCM47xx gpio api */
+u32 bcm47xx_gpio_in(u32 mask)
 {
 	switch (bcm47xx_bus_type) {
 #ifdef CONFIG_BCM47XX_SSB
 	case BCM47XX_BUS_TYPE_SSB:
-		if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco) &&
-		    ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
-			return -EINVAL;
-
-		if (ssb_extif_available(&bcm47xx_bus.ssb.extif) &&
-		    ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
-			return -EINVAL;
-
-		if (test_and_set_bit(gpio, gpio_in_use))
-			return -EBUSY;
-
-		return 0;
+		return ssb_gpio_in(&bcm47xx_bus.ssb, mask);
 #endif
 #ifdef CONFIG_BCM47XX_BCMA
 	case BCM47XX_BUS_TYPE_BCMA:
-		if (gpio >= BCM47XX_CHIPCO_GPIO_LINES)
-			return -EINVAL;
-
-		if (test_and_set_bit(gpio, gpio_in_use))
-			return -EBUSY;
+		return bcma_chipco_gpio_in(&bcm47xx_bus.bcma.bus.drv_cc, mask);
+#endif
+	}
+	return -EINVAL;
+}
+EXPORT_SYMBOL(bcm47xx_gpio_in);
 
-		return 0;
+u32 bcm47xx_gpio_out(u32 mask, u32 value)
+{
+	switch (bcm47xx_bus_type) {
+#ifdef CONFIG_BCM47XX_SSB
+	case BCM47XX_BUS_TYPE_SSB:
+		return ssb_gpio_out(&bcm47xx_bus.ssb, mask, value);
+#endif
+#ifdef CONFIG_BCM47XX_BCMA
+	case BCM47XX_BUS_TYPE_BCMA:
+		return bcma_chipco_gpio_out(&bcm47xx_bus.bcma.bus.drv_cc, mask,
+					    value);
 #endif
 	}
 	return -EINVAL;
 }
-EXPORT_SYMBOL(gpio_request);
+EXPORT_SYMBOL(bcm47xx_gpio_out);
 
-void gpio_free(unsigned gpio)
+u32 bcm47xx_gpio_outen(u32 mask, u32 value)
 {
 	switch (bcm47xx_bus_type) {
 #ifdef CONFIG_BCM47XX_SSB
 	case BCM47XX_BUS_TYPE_SSB:
-		if (ssb_chipco_available(&bcm47xx_bus.ssb.chipco) &&
-		    ((unsigned)gpio >= BCM47XX_CHIPCO_GPIO_LINES))
-			return;
+		return ssb_gpio_outen(&bcm47xx_bus.ssb, mask, value);
+#endif
+#ifdef CONFIG_BCM47XX_BCMA
+	case BCM47XX_BUS_TYPE_BCMA:
+		return bcma_chipco_gpio_outen(&bcm47xx_bus.bcma.bus.drv_cc,
+					      mask, value);
+#endif
+	}
+	return -EINVAL;
+}
+EXPORT_SYMBOL(bcm47xx_gpio_outen);
 
-		if (ssb_extif_available(&bcm47xx_bus.ssb.extif) &&
-		    ((unsigned)gpio >= BCM47XX_EXTIF_GPIO_LINES))
-			return;
+u32 bcm47xx_gpio_control(u32 mask, u32 value)
+{
+	switch (bcm47xx_bus_type) {
+#ifdef CONFIG_BCM47XX_SSB
+	case BCM47XX_BUS_TYPE_SSB:
+		return ssb_gpio_control(&bcm47xx_bus.ssb, mask, value);
+#endif
+#ifdef CONFIG_BCM47XX_BCMA
+	case BCM47XX_BUS_TYPE_BCMA:
+		return bcma_chipco_gpio_control(&bcm47xx_bus.bcma.bus.drv_cc,
+						mask, value);
+#endif
+	}
+	return -EINVAL;
+}
+EXPORT_SYMBOL(bcm47xx_gpio_control);
 
-		clear_bit(gpio, gpio_in_use);
-		return;
+u32 bcm47xx_gpio_intmask(u32 mask, u32 value)
+{
+	switch (bcm47xx_bus_type) {
+#ifdef CONFIG_BCM47XX_SSB
+	case BCM47XX_BUS_TYPE_SSB:
+		return ssb_gpio_intmask(&bcm47xx_bus.ssb, mask, value);
 #endif
 #ifdef CONFIG_BCM47XX_BCMA
 	case BCM47XX_BUS_TYPE_BCMA:
-		if (gpio >= BCM47XX_CHIPCO_GPIO_LINES)
-			return;
+		return bcma_chipco_gpio_intmask(&bcm47xx_bus.bcma.bus.drv_cc,
+						mask, value);
+#endif
+	}
+	return -EINVAL;
+}
+EXPORT_SYMBOL(bcm47xx_gpio_intmask);
 
-		clear_bit(gpio, gpio_in_use);
-		return;
+u32 bcm47xx_gpio_polarity(u32 mask, u32 value)
+{
+	switch (bcm47xx_bus_type) {
+#ifdef CONFIG_BCM47XX_SSB
+	case BCM47XX_BUS_TYPE_SSB:
+		return ssb_gpio_polarity(&bcm47xx_bus.ssb, mask, value);
+#endif
+#ifdef CONFIG_BCM47XX_BCMA
+	case BCM47XX_BUS_TYPE_BCMA:
+		return bcma_chipco_gpio_polarity(&bcm47xx_bus.bcma.bus.drv_cc,
+						 mask, value);
 #endif
 	}
+	return -EINVAL;
+}
+EXPORT_SYMBOL(bcm47xx_gpio_polarity);
+
+
+static int bcm47xx_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
+{
+	return bcm47xx_gpio_in(1 << gpio);
+}
+
+static void bcm47xx_gpio_set_value(struct gpio_chip *chip,
+				   unsigned gpio, int value)
+{
+	bcm47xx_gpio_out(1 << gpio, value ? 1 << gpio : 0);
+}
+
+static int bcm47xx_gpio_direction_input(struct gpio_chip *chip,
+					unsigned gpio)
+{
+	bcm47xx_gpio_outen(1 << gpio, 0);
+	return 0;
+}
+
+static int bcm47xx_gpio_direction_output(struct gpio_chip *chip,
+					 unsigned gpio, int value)
+{
+	/* first set the gpio out value */
+	bcm47xx_gpio_out(1 << gpio, value ? 1 << gpio : 0);
+	/* then set the gpio mode */
+	bcm47xx_gpio_outen(1 << gpio, 1 << gpio);
+	return 0;
 }
-EXPORT_SYMBOL(gpio_free);
 
-int gpio_to_irq(unsigned gpio)
+static int bcm47xx_gpio_to_irq(struct gpio_chip *chip, unsigned gpio)
 {
 	switch (bcm47xx_bus_type) {
 #ifdef CONFIG_BCM47XX_SSB
@@ -99,4 +170,55 @@ int gpio_to_irq(unsigned gpio)
 	}
 	return -EINVAL;
 }
-EXPORT_SYMBOL_GPL(gpio_to_irq);
+
+static struct gpio_chip bcm47xx_gpio_chip = {
+	.label			= "bcm47xx",
+	.get			= bcm47xx_gpio_get_value,
+	.set			= bcm47xx_gpio_set_value,
+	.direction_input	= bcm47xx_gpio_direction_input,
+	.direction_output	= bcm47xx_gpio_direction_output,
+	.to_irq			= bcm47xx_gpio_to_irq,
+	.base			= 0,
+};
+
+void __init bcm47xx_gpio_init(void)
+{
+	int err;
+
+	switch (bcm47xx_bus_type) {
+#ifdef CONFIG_BCM47XX_SSB
+	case BCM47XX_BUS_TYPE_SSB:
+		bcm47xx_gpio_count = ssb_gpio_count(&bcm47xx_bus.ssb);
+		break;
+#endif
+#ifdef CONFIG_BCM47XX_BCMA
+	case BCM47XX_BUS_TYPE_BCMA:
+		bcm47xx_gpio_count = bcma_chipco_gpio_count();
+		break;
+#endif
+	}
+
+	bcm47xx_gpio_chip.ngpio = bcm47xx_gpio_count;
+
+	err = gpiochip_add(&bcm47xx_gpio_chip);
+	if (err)
+		panic("cannot add BCM47xx GPIO chip, error=%d", err);
+}
+
+int gpio_get_value(unsigned gpio)
+{
+	if (gpio < bcm47xx_gpio_count)
+		return bcm47xx_gpio_in(1 << gpio);
+
+	return __gpio_get_value(gpio);
+}
+EXPORT_SYMBOL(gpio_get_value);
+
+void gpio_set_value(unsigned gpio, int value)
+{
+	if (gpio < bcm47xx_gpio_count)
+		bcm47xx_gpio_out(1 << gpio, value ? 1 << gpio : 0);
+	else
+		__gpio_set_value(gpio, value);
+}
+EXPORT_SYMBOL(gpio_set_value);
--- a/arch/mips/bcm47xx/setup.c
+++ b/arch/mips/bcm47xx/setup.c
@@ -252,6 +252,8 @@ void __init plat_mem_setup(void)
 	_machine_restart = bcm47xx_machine_restart;
 	_machine_halt = bcm47xx_machine_halt;
 	pm_power_off = bcm47xx_machine_halt;
+
+	bcm47xx_gpio_init();
 }
 
 static int __init bcm47xx_register_bus_complete(void)
--- a/arch/mips/bcm47xx/wgt634u.c
+++ b/arch/mips/bcm47xx/wgt634u.c
@@ -133,6 +133,7 @@ static int __init wgt634u_init(void)
 	 * been allocated ranges 00:09:5b:xx:xx:xx and 00:0f:b5:xx:xx:xx.
 	 */
 	u8 *et0mac;
+	int err;
 
 	if (bcm47xx_bus_type != BCM47XX_BUS_TYPE_SSB)
 		return -ENODEV;
@@ -146,6 +147,12 @@ static int __init wgt634u_init(void)
 
 		printk(KERN_INFO "WGT634U machine detected.\n");
 
+		err = gpio_request(WGT634U_GPIO_RESET, "reset-buton");
+		if (err) {
+			printk(KERN_INFO "Can not register gpio for reset button\n");
+			return 0;
+		}
+
 		if (!request_irq(gpio_to_irq(WGT634U_GPIO_RESET),
 				 gpio_interrupt, IRQF_SHARED,
 				 "WGT634U GPIO", &bcm47xx_bus.ssb.chipco)) {
--- a/arch/mips/include/asm/mach-bcm47xx/bcm47xx.h
+++ b/arch/mips/include/asm/mach-bcm47xx/bcm47xx.h
@@ -56,4 +56,6 @@ void bcm47xx_fill_bcma_boardinfo(struct
 				 const char *prefix);
 #endif
 
+void bcm47xx_gpio_init(void);
+
 #endif /* __ASM_BCM47XX_H */
--- a/arch/mips/include/asm/mach-bcm47xx/gpio.h
+++ b/arch/mips/include/asm/mach-bcm47xx/gpio.h
@@ -4,152 +4,42 @@
  * for more details.
  *
  * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
+ * Copyright (C) 2012 Hauke Mehrtens <hauke@hauke-m.de>
  */
 
 #ifndef __BCM47XX_GPIO_H
 #define __BCM47XX_GPIO_H
 
-#include <linux/ssb/ssb_embedded.h>
-#include <linux/bcma/bcma.h>
-#include <asm/mach-bcm47xx/bcm47xx.h>
-
-#define BCM47XX_EXTIF_GPIO_LINES	5
-#define BCM47XX_CHIPCO_GPIO_LINES	16
-
-extern int gpio_request(unsigned gpio, const char *label);
-extern void gpio_free(unsigned gpio);
-extern int gpio_to_irq(unsigned gpio);
-
-static inline int gpio_get_value(unsigned gpio)
-{
-	switch (bcm47xx_bus_type) {
-#ifdef CONFIG_BCM47XX_SSB
-	case BCM47XX_BUS_TYPE_SSB:
-		return ssb_gpio_in(&bcm47xx_bus.ssb, 1 << gpio);
-#endif
-#ifdef CONFIG_BCM47XX_BCMA
-	case BCM47XX_BUS_TYPE_BCMA:
-		return bcma_chipco_gpio_in(&bcm47xx_bus.bcma.bus.drv_cc,
-					   1 << gpio);
-#endif
-	}
-	return -EINVAL;
-}
-
-#define gpio_get_value_cansleep	gpio_get_value
-
-static inline void gpio_set_value(unsigned gpio, int value)
-{
-	switch (bcm47xx_bus_type) {
-#ifdef CONFIG_BCM47XX_SSB
-	case BCM47XX_BUS_TYPE_SSB:
-		ssb_gpio_out(&bcm47xx_bus.ssb, 1 << gpio,
-			     value ? 1 << gpio : 0);
-		return;
-#endif
-#ifdef CONFIG_BCM47XX_BCMA
-	case BCM47XX_BUS_TYPE_BCMA:
-		bcma_chipco_gpio_out(&bcm47xx_bus.bcma.bus.drv_cc, 1 << gpio,
-				     value ? 1 << gpio : 0);
-		return;
-#endif
-	}
-}
-
-#define gpio_set_value_cansleep gpio_set_value
-
-static inline int gpio_cansleep(unsigned gpio)
-{
-	return 0;
-}
-
-static inline int gpio_is_valid(unsigned gpio)
-{
-	return gpio < (BCM47XX_EXTIF_GPIO_LINES + BCM47XX_CHIPCO_GPIO_LINES);
-}
+#define ARCH_NR_GPIOS	64
+#include <asm-generic/gpio.h>
 
+/* low level BCM47xx gpio api */
+u32 bcm47xx_gpio_in(u32 mask);
+u32 bcm47xx_gpio_out(u32 mask, u32 value);
+u32 bcm47xx_gpio_outen(u32 mask, u32 value);
+u32 bcm47xx_gpio_control(u32 mask, u32 value);
+u32 bcm47xx_gpio_intmask(u32 mask, u32 value);
+u32 bcm47xx_gpio_polarity(u32 mask, u32 value);
 
-static inline int gpio_direction_input(unsigned gpio)
-{
-	switch (bcm47xx_bus_type) {
-#ifdef CONFIG_BCM47XX_SSB
-	case BCM47XX_BUS_TYPE_SSB:
-		ssb_gpio_outen(&bcm47xx_bus.ssb, 1 << gpio, 0);
-		return 0;
-#endif
-#ifdef CONFIG_BCM47XX_BCMA
-	case BCM47XX_BUS_TYPE_BCMA:
-		bcma_chipco_gpio_outen(&bcm47xx_bus.bcma.bus.drv_cc, 1 << gpio,
-				       0);
-		return 0;
-#endif
-	}
-	return -EINVAL;
-}
+int gpio_get_value(unsigned gpio);
+void gpio_set_value(unsigned gpio, int value);
 
-static inline int gpio_direction_output(unsigned gpio, int value)
+static inline void gpio_intmask(unsigned gpio, int value)
 {
-	switch (bcm47xx_bus_type) {
-#ifdef CONFIG_BCM47XX_SSB
-	case BCM47XX_BUS_TYPE_SSB:
-		/* first set the gpio out value */
-		ssb_gpio_out(&bcm47xx_bus.ssb, 1 << gpio,
-			     value ? 1 << gpio : 0);
-		/* then set the gpio mode */
-		ssb_gpio_outen(&bcm47xx_bus.ssb, 1 << gpio, 1 << gpio);
-		return 0;
-#endif
-#ifdef CONFIG_BCM47XX_BCMA
-	case BCM47XX_BUS_TYPE_BCMA:
-		/* first set the gpio out value */
-		bcma_chipco_gpio_out(&bcm47xx_bus.bcma.bus.drv_cc, 1 << gpio,
-				     value ? 1 << gpio : 0);
-		/* then set the gpio mode */
-		bcma_chipco_gpio_outen(&bcm47xx_bus.bcma.bus.drv_cc, 1 << gpio,
-				       1 << gpio);
-		return 0;
-#endif
-	}
-	return -EINVAL;
+	bcm47xx_gpio_intmask(1 << gpio, value ? 1 << gpio : 0);
 }
 
-static inline int gpio_intmask(unsigned gpio, int value)
+static inline void gpio_polarity(unsigned gpio, int value)
 {
-	switch (bcm47xx_bus_type) {
-#ifdef CONFIG_BCM47XX_SSB
-	case BCM47XX_BUS_TYPE_SSB:
-		ssb_gpio_intmask(&bcm47xx_bus.ssb, 1 << gpio,
-				 value ? 1 << gpio : 0);
-		return 0;
-#endif
-#ifdef CONFIG_BCM47XX_BCMA
-	case BCM47XX_BUS_TYPE_BCMA:
-		bcma_chipco_gpio_intmask(&bcm47xx_bus.bcma.bus.drv_cc,
-					 1 << gpio, value ? 1 << gpio : 0);
-		return 0;
-#endif
-	}
-	return -EINVAL;
+	bcm47xx_gpio_polarity(1 << gpio, value ? 1 << gpio : 0);
 }
 
-static inline int gpio_polarity(unsigned gpio, int value)
+static inline int irq_to_gpio(int gpio)
 {
-	switch (bcm47xx_bus_type) {
-#ifdef CONFIG_BCM47XX_SSB
-	case BCM47XX_BUS_TYPE_SSB:
-		ssb_gpio_polarity(&bcm47xx_bus.ssb, 1 << gpio,
-				  value ? 1 << gpio : 0);
-		return 0;
-#endif
-#ifdef CONFIG_BCM47XX_BCMA
-	case BCM47XX_BUS_TYPE_BCMA:
-		bcma_chipco_gpio_polarity(&bcm47xx_bus.bcma.bus.drv_cc,
-					  1 << gpio, value ? 1 << gpio : 0);
-		return 0;
-#endif
-	}
 	return -EINVAL;
 }
 
+#define gpio_cansleep	__gpio_cansleep
+#define gpio_to_irq __gpio_to_irq
 
 #endif /* __BCM47XX_GPIO_H */