2nd round of GPIO changes for v3.3 merge window

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Merge tag 'gpio-for-linus' of git://git.secretlab.ca/git/linux-2.6

2nd round of GPIO changes for v3.3 merge window

* tag 'gpio-for-linus' of git://git.secretlab.ca/git/linux-2.6:
  GPIO: sa1100: implement proper gpiolib gpio_to_irq conversion
  gpio: pl061: remove combined interrupt
  gpio: pl061: convert to use generic irq chip
  GPIO: add bindings for managed devices
  ARM: realview: convert pl061 no irq to 0 instead of -1
  gpio: pl061: convert to use 0 for no irq
  gpio: pl061: use chained_irq_* functions in irq handler
  GPIO/pl061: Add suspend resume capability
  drivers/gpio/gpio-tegra.c: use devm_request_and_ioremap

arch/arm/mach-realview/realview_eb.c

@@ -117,17 +117,14 @@ static void __init realview_eb_map_io(void)
 
 static struct pl061_platform_data gpio0_plat_data = {
 	.gpio_base	= 0,
-	.irq_base	= -1,
 };
 
 static struct pl061_platform_data gpio1_plat_data = {
 	.gpio_base	= 8,
-	.irq_base	= -1,
 };
 
 static struct pl061_platform_data gpio2_plat_data = {
 	.gpio_base	= 16,
-	.irq_base	= -1,
 };
 
 static struct pl022_ssp_controller ssp0_plat_data = {

arch/arm/mach-realview/realview_pb1176.c

@@ -113,17 +113,14 @@ static void __init realview_pb1176_map_io(void)
 
 static struct pl061_platform_data gpio0_plat_data = {
 	.gpio_base	= 0,
-	.irq_base	= -1,
 };
 
 static struct pl061_platform_data gpio1_plat_data = {
 	.gpio_base	= 8,
-	.irq_base	= -1,
 };
 
 static struct pl061_platform_data gpio2_plat_data = {
 	.gpio_base	= 16,
-	.irq_base	= -1,
 };
 
 static struct pl022_ssp_controller ssp0_plat_data = {

arch/arm/mach-realview/realview_pb11mp.c

@@ -112,17 +112,14 @@ static void __init realview_pb11mp_map_io(void)
 
 static struct pl061_platform_data gpio0_plat_data = {
 	.gpio_base	= 0,
-	.irq_base	= -1,
 };
 
 static struct pl061_platform_data gpio1_plat_data = {
 	.gpio_base	= 8,
-	.irq_base	= -1,
 };
 
 static struct pl061_platform_data gpio2_plat_data = {
 	.gpio_base	= 16,
-	.irq_base	= -1,
 };
 
 static struct pl022_ssp_controller ssp0_plat_data = {

arch/arm/mach-realview/realview_pba8.c

@@ -102,17 +102,14 @@ static void __init realview_pba8_map_io(void)
 
 static struct pl061_platform_data gpio0_plat_data = {
 	.gpio_base	= 0,
-	.irq_base	= -1,
 };
 
 static struct pl061_platform_data gpio1_plat_data = {
 	.gpio_base	= 8,
-	.irq_base	= -1,
 };
 
 static struct pl061_platform_data gpio2_plat_data = {
 	.gpio_base	= 16,
-	.irq_base	= -1,
 };
 
 static struct pl022_ssp_controller ssp0_plat_data = {

arch/arm/mach-realview/realview_pbx.c

@@ -124,17 +124,14 @@ static void __init realview_pbx_map_io(void)
 
 static struct pl061_platform_data gpio0_plat_data = {
 	.gpio_base	= 0,
-	.irq_base	= -1,
 };
 
 static struct pl061_platform_data gpio1_plat_data = {
 	.gpio_base	= 8,
-	.irq_base	= -1,
 };
 
 static struct pl061_platform_data gpio2_plat_data = {
 	.gpio_base	= 16,
-	.irq_base	= -1,
 };
 
 static struct pl022_ssp_controller ssp0_plat_data = {

arch/arm/mach-sa1100/include/mach/gpio.h

@@ -51,7 +51,4 @@ static inline void gpio_set_value(unsigned gpio, int value)
 
 #define gpio_cansleep	__gpio_cansleep
 
-#define gpio_to_irq(gpio)	((gpio < 11) ? (IRQ_GPIO0 + gpio) : \
-					(IRQ_GPIO11 - 11 + gpio))
-
 #endif

drivers/gpio/Kconfig

@@ -138,6 +138,7 @@ config GPIO_MXS
 config GPIO_PL061
 	bool "PrimeCell PL061 GPIO support"
 	depends on ARM_AMBA
+	select GENERIC_IRQ_CHIP
 	help
 	  Say yes here to support the PrimeCell PL061 GPIO device
 

drivers/gpio/Makefile

@@ -2,7 +2,7 @@
 
 ccflags-$(CONFIG_DEBUG_GPIO)	+= -DDEBUG
 
-obj-$(CONFIG_GPIOLIB)		+= gpiolib.o
+obj-$(CONFIG_GPIOLIB)		+= gpiolib.o devres.o
 
 # Device drivers. Generally keep list sorted alphabetically
 obj-$(CONFIG_GPIO_GENERIC)	+= gpio-generic.o

drivers/gpio/devres.c

@@ -0,0 +1,90 @@
+/*
+ * drivers/gpio/devres.c - managed gpio resources
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * This file is based on kernel/irq/devres.c
+ *
+ * Copyright (c) 2011 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/module.h>
+#include <linux/gpio.h>
+#include <linux/device.h>
+#include <linux/gfp.h>
+
+static void devm_gpio_release(struct device *dev, void *res)
+{
+	unsigned *gpio = res;
+
+	gpio_free(*gpio);
+}
+
+static int devm_gpio_match(struct device *dev, void *res, void *data)
+{
+	unsigned *this = res, *gpio = data;
+
+	return *this == *gpio;
+}
+
+/**
+ *      devm_gpio_request - request a gpio for a managed device
+ *      @dev: device to request the gpio for
+ *      @gpio: gpio to allocate
+ *      @label: the name of the requested gpio
+ *
+ *      Except for the extra @dev argument, this function takes the
+ *      same arguments and performs the same function as
+ *      gpio_request().  GPIOs requested with this function will be
+ *      automatically freed on driver detach.
+ *
+ *      If an GPIO allocated with this function needs to be freed
+ *      separately, devm_gpio_free() must be used.
+ */
+
+int devm_gpio_request(struct device *dev, unsigned gpio, const char *label)
+{
+	unsigned *dr;
+	int rc;
+
+	dr = devres_alloc(devm_gpio_release, sizeof(unsigned), GFP_KERNEL);
+	if (!dr)
+		return -ENOMEM;
+
+	rc = gpio_request(gpio, label);
+	if (rc) {
+		devres_free(dr);
+		return rc;
+	}
+
+	*dr = gpio;
+	devres_add(dev, dr);
+
+	return 0;
+}
+EXPORT_SYMBOL(devm_gpio_request);
+
+/**
+ *      devm_gpio_free - free an interrupt
+ *      @dev: device to free gpio for
+ *      @gpio: gpio to free
+ *
+ *      Except for the extra @dev argument, this function takes the
+ *      same arguments and performs the same function as gpio_free().
+ *      This function instead of gpio_free() should be used to manually
+ *      free GPIOs allocated with devm_gpio_request().
+ */
+void devm_gpio_free(struct device *dev, unsigned int gpio)
+{
+
+	WARN_ON(devres_destroy(dev, devm_gpio_release, devm_gpio_match,
+		&gpio));
+	gpio_free(gpio);
+}
+EXPORT_SYMBOL(devm_gpio_free);

drivers/gpio/gpio-pl061.c

@@ -12,7 +12,6 @@
 #include <linux/spinlock.h>
 #include <linux/errno.h>
 #include <linux/module.h>
-#include <linux/list.h>
 #include <linux/io.h>
 #include <linux/ioport.h>
 #include <linux/irq.h>
@@ -23,6 +22,8 @@
 #include <linux/amba/bus.h>
 #include <linux/amba/pl061.h>
 #include <linux/slab.h>
+#include <linux/pm.h>
+#include <asm/mach/irq.h>
 
 #define GPIODIR 0x400
 #define GPIOIS  0x404
@@ -35,25 +36,33 @@
 
 #define PL061_GPIO_NR	8
 
-struct pl061_gpio {
+#ifdef CONFIG_PM
-	/* We use a list of pl061_gpio structs for each trigger IRQ in the main
+struct pl061_context_save_regs {
-	 * interrupts controller of the system. We need this to support systems
+	u8 gpio_data;
-	 * in which more that one PL061s are connected to the same IRQ. The ISR
+	u8 gpio_dir;
-	 * interates through this list to find the source of the interrupt.
+	u8 gpio_is;
-	 */
+	u8 gpio_ibe;
-	struct list_head	list;
+	u8 gpio_iev;
+	u8 gpio_ie;
+};
+#endif
 
+struct pl061_gpio {
 	/* Each of the two spinlocks protects a different set of hardware
 	 * regiters and data structurs. This decouples the code of the IRQ from
 	 * the GPIO code. This also makes the case of a GPIO routine call from
 	 * the IRQ code simpler.
 	 */
 	spinlock_t		lock;		/* GPIO registers */
-	spinlock_t		irq_lock;	/* IRQ registers */
 
 	void __iomem		*base;
-	unsigned		irq_base;
+	int			irq_base;
+	struct irq_chip_generic	*irq_gc;
 	struct gpio_chip	gc;
+
+#ifdef CONFIG_PM
+	struct pl061_context_save_regs csave_regs;
+#endif
 };
 
 static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
@@ -118,46 +127,16 @@ static int pl061_to_irq(struct gpio_chip *gc, unsigned offset)
 {
 	struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
 
-	if (chip->irq_base == NO_IRQ)
+	if (chip->irq_base <= 0)
 		return -EINVAL;
 
 	return chip->irq_base + offset;
 }
 
-/*
- * PL061 GPIO IRQ
- */
-static void pl061_irq_disable(struct irq_data *d)
-{
-	struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
-	int offset = d->irq - chip->irq_base;
-	unsigned long flags;
-	u8 gpioie;
-
-	spin_lock_irqsave(&chip->irq_lock, flags);
-	gpioie = readb(chip->base + GPIOIE);
-	gpioie &= ~(1 << offset);
-	writeb(gpioie, chip->base + GPIOIE);
-	spin_unlock_irqrestore(&chip->irq_lock, flags);
-}
-
-static void pl061_irq_enable(struct irq_data *d)
-{
-	struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
-	int offset = d->irq - chip->irq_base;
-	unsigned long flags;
-	u8 gpioie;
-
-	spin_lock_irqsave(&chip->irq_lock, flags);
-	gpioie = readb(chip->base + GPIOIE);
-	gpioie |= 1 << offset;
-	writeb(gpioie, chip->base + GPIOIE);
-	spin_unlock_irqrestore(&chip->irq_lock, flags);
-}
-
 static int pl061_irq_type(struct irq_data *d, unsigned trigger)
 {
-	struct pl061_gpio *chip = irq_data_get_irq_chip_data(d);
+	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+	struct pl061_gpio *chip = gc->private;
 	int offset = d->irq - chip->irq_base;
 	unsigned long flags;
 	u8 gpiois, gpioibe, gpioiev;
@@ -165,7 +144,7 @@ static int pl061_irq_type(struct irq_data *d, unsigned trigger)
 	if (offset < 0 || offset >= PL061_GPIO_NR)
 		return -EINVAL;
 
-	spin_lock_irqsave(&chip->irq_lock, flags);
+	raw_spin_lock_irqsave(&gc->lock, flags);
 
 	gpioiev = readb(chip->base + GPIOIEV);
 
@@ -194,49 +173,54 @@ static int pl061_irq_type(struct irq_data *d, unsigned trigger)
 
 	writeb(gpioiev, chip->base + GPIOIEV);
 
-	spin_unlock_irqrestore(&chip->irq_lock, flags);
+	raw_spin_unlock_irqrestore(&gc->lock, flags);
 
 	return 0;
 }
 
-static struct irq_chip pl061_irqchip = {
-	.name		= "GPIO",
-	.irq_enable	= pl061_irq_enable,
-	.irq_disable	= pl061_irq_disable,
-	.irq_set_type	= pl061_irq_type,
-};
-
 static void pl061_irq_handler(unsigned irq, struct irq_desc *desc)
 {
-	struct list_head *chip_list = irq_get_handler_data(irq);
-	struct list_head *ptr;
-	struct pl061_gpio *chip;
-
-	desc->irq_data.chip->irq_ack(&desc->irq_data);
-	list_for_each(ptr, chip_list) {
 	unsigned long pending;
 	int offset;
+	struct pl061_gpio *chip = irq_desc_get_handler_data(desc);
+	struct irq_chip *irqchip = irq_desc_get_chip(desc);
+
+	chained_irq_enter(irqchip, desc);
 
-		chip = list_entry(ptr, struct pl061_gpio, list);
 	pending = readb(chip->base + GPIOMIS);
 	writeb(pending, chip->base + GPIOIC);
-
+	if (pending) {
-		if (pending == 0)
-			continue;
-
 		for_each_set_bit(offset, &pending, PL061_GPIO_NR)
 			generic_handle_irq(pl061_to_irq(&chip->gc, offset));
 	}
-	desc->irq_data.chip->irq_unmask(&desc->irq_data);
+
+	chained_irq_exit(irqchip, desc);
+}
+
+static void __init pl061_init_gc(struct pl061_gpio *chip, int irq_base)
+{
+	struct irq_chip_type *ct;
+
+	chip->irq_gc = irq_alloc_generic_chip("gpio-pl061", 1, irq_base,
+					      chip->base, handle_simple_irq);
+	chip->irq_gc->private = chip;
+
+	ct = chip->irq_gc->chip_types;
+	ct->chip.irq_mask = irq_gc_mask_clr_bit;
+	ct->chip.irq_unmask = irq_gc_mask_set_bit;
+	ct->chip.irq_set_type = pl061_irq_type;
+	ct->chip.irq_set_wake = irq_gc_set_wake;
+	ct->regs.mask = GPIOIE;
+
+	irq_setup_generic_chip(chip->irq_gc, IRQ_MSK(PL061_GPIO_NR),
+			       IRQ_GC_INIT_NESTED_LOCK, IRQ_NOREQUEST, 0);
 }
 
 static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
 {
 	struct pl061_platform_data *pdata;
 	struct pl061_gpio *chip;
-	struct list_head *chip_list;
 	int ret, irq, i;
-	static DECLARE_BITMAP(init_irq, NR_IRQS);
 
 	chip = kzalloc(sizeof(*chip), GFP_KERNEL);
 	if (chip == NULL)
@@ -248,7 +232,7 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
 		chip->irq_base = pdata->irq_base;
 	} else if (dev->dev.of_node) {
 		chip->gc.base = -1;
-		chip->irq_base = NO_IRQ;
+		chip->irq_base = 0;
 	} else {
 		ret = -ENODEV;
 		goto free_mem;
@@ -267,8 +251,6 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
 	}
 
 	spin_lock_init(&chip->lock);
-	spin_lock_init(&chip->irq_lock);
-	INIT_LIST_HEAD(&chip->list);
 
 	chip->gc.direction_input = pl061_direction_input;
 	chip->gc.direction_output = pl061_direction_output;
@@ -288,9 +270,11 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
 	 * irq_chip support
 	 */
 
-	if (chip->irq_base == NO_IRQ)
+	if (chip->irq_base <= 0)
 		return 0;
 
+	pl061_init_gc(chip, chip->irq_base);
+
 	writeb(0, chip->base + GPIOIE); /* disable irqs */
 	irq = dev->irq[0];
 	if (irq < 0) {
@@ -298,18 +282,7 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
 		goto iounmap;
 	}
 	irq_set_chained_handler(irq, pl061_irq_handler);
-	if (!test_and_set_bit(irq, init_irq)) { /* list initialized? */
+	irq_set_handler_data(irq, chip);
-		chip_list = kmalloc(sizeof(*chip_list), GFP_KERNEL);
-		if (chip_list == NULL) {
-			clear_bit(irq, init_irq);
-			ret = -ENOMEM;
-			goto iounmap;
-		}
-		INIT_LIST_HEAD(chip_list);
-		irq_set_handler_data(irq, chip_list);
-	} else
-		chip_list = irq_get_handler_data(irq);
-	list_add(&chip->list, chip_list);
 
 	for (i = 0; i < PL061_GPIO_NR; i++) {
 		if (pdata) {
@@ -319,13 +292,10 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
 			else
 				pl061_direction_input(&chip->gc, i);
 		}
-
-		irq_set_chip_and_handler(i + chip->irq_base, &pl061_irqchip,
-					 handle_simple_irq);
-		set_irq_flags(i+chip->irq_base, IRQF_VALID);
-		irq_set_chip_data(i + chip->irq_base, chip);
 	}
 
+	amba_set_drvdata(dev, chip);
+
 	return 0;
 
 iounmap:
@@ -338,6 +308,53 @@ static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
 	return ret;
 }
 
+#ifdef CONFIG_PM
+static int pl061_suspend(struct device *dev)
+{
+	struct pl061_gpio *chip = dev_get_drvdata(dev);
+	int offset;
+
+	chip->csave_regs.gpio_data = 0;
+	chip->csave_regs.gpio_dir = readb(chip->base + GPIODIR);
+	chip->csave_regs.gpio_is = readb(chip->base + GPIOIS);
+	chip->csave_regs.gpio_ibe = readb(chip->base + GPIOIBE);
+	chip->csave_regs.gpio_iev = readb(chip->base + GPIOIEV);
+	chip->csave_regs.gpio_ie = readb(chip->base + GPIOIE);
+
+	for (offset = 0; offset < PL061_GPIO_NR; offset++) {
+		if (chip->csave_regs.gpio_dir & (1 << offset))
+			chip->csave_regs.gpio_data |=
+				pl061_get_value(&chip->gc, offset) << offset;
+	}
+
+	return 0;
+}
+
+static int pl061_resume(struct device *dev)
+{
+	struct pl061_gpio *chip = dev_get_drvdata(dev);
+	int offset;
+
+	for (offset = 0; offset < PL061_GPIO_NR; offset++) {
+		if (chip->csave_regs.gpio_dir & (1 << offset))
+			pl061_direction_output(&chip->gc, offset,
+					chip->csave_regs.gpio_data &
+					(1 << offset));
+		else
+			pl061_direction_input(&chip->gc, offset);
+	}
+
+	writeb(chip->csave_regs.gpio_is, chip->base + GPIOIS);
+	writeb(chip->csave_regs.gpio_ibe, chip->base + GPIOIBE);
+	writeb(chip->csave_regs.gpio_iev, chip->base + GPIOIEV);
+	writeb(chip->csave_regs.gpio_ie, chip->base + GPIOIE);
+
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(pl061_dev_pm_ops, pl061_suspend, pl061_resume);
+#endif
+
 static struct amba_id pl061_ids[] = {
 	{
 		.id	= 0x00041061,
@@ -351,6 +368,9 @@ MODULE_DEVICE_TABLE(amba, pl061_ids);
 static struct amba_driver pl061_gpio_driver = {
 	.drv = {
 		.name	= "pl061_gpio",
+#ifdef CONFIG_PM
+		.pm	= &pl061_dev_pm_ops,
+#endif
 	},
 	.id_table	= pl061_ids,
 	.probe		= pl061_probe,

drivers/gpio/gpio-sa1100.c

@@ -47,12 +47,18 @@ static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int
 	return 0;
 }
 
+static int sa1100_to_irq(struct gpio_chip *chip, unsigned offset)
+{
+	return offset < 11 ? (IRQ_GPIO0 + offset) : (IRQ_GPIO11 - 11 + offset);
+}
+
 static struct gpio_chip sa1100_gpio_chip = {
 	.label			= "gpio",
 	.direction_input	= sa1100_direction_input,
 	.direction_output	= sa1100_direction_output,
 	.set			= sa1100_gpio_set,
 	.get			= sa1100_gpio_get,
+	.to_irq			= sa1100_to_irq,
 	.base			= 0,
 	.ngpio			= GPIO_MAX + 1,
 };

drivers/gpio/gpio-tegra.c

@@ -361,14 +361,7 @@ static int __devinit tegra_gpio_probe(struct platform_device *pdev)
 		return -ENODEV;
 	}
 
-	if (!devm_request_mem_region(&pdev->dev, res->start,
+	regs = devm_request_and_ioremap(&pdev->dev, res);
-				     resource_size(res),
-				     dev_name(&pdev->dev))) {
-		dev_err(&pdev->dev, "Couldn't request MEM resource\n");
-		return -ENODEV;
-	}
-
-	regs = devm_ioremap(&pdev->dev, res->start, resource_size(res));
 	if (!regs) {
 		dev_err(&pdev->dev, "Couldn't ioremap regs\n");
 		return -ENODEV;

include/asm-generic/gpio.h

@@ -177,6 +177,10 @@ extern int gpio_request_one(unsigned gpio, unsigned long flags, const char *labe
 extern int gpio_request_array(const struct gpio *array, size_t num);
 extern void gpio_free_array(const struct gpio *array, size_t num);
 
+/* bindings for managed devices that want to request gpios */
+int devm_gpio_request(struct device *dev, unsigned gpio, const char *label);
+void devm_gpio_free(struct device *dev, unsigned int gpio);
+
 #ifdef CONFIG_GPIO_SYSFS
 
 /*

include/linux/amba/pl061.h

@@ -7,7 +7,7 @@ struct pl061_platform_data {
 	unsigned	gpio_base;
 
 	/* number of the first IRQ.
-	 * If the IRQ functionality in not desired this must be set to NO_IRQ.
+	 * If the IRQ functionality in not desired this must be set to 0.
 	 */
 	unsigned	irq_base;