X-Git-Url: http://git.cascardo.eti.br/?a=blobdiff_plain;f=arch%2Farm%2Fplat-nomadik%2Fgpio.c;h=971e5d3798e47838ba9a928f3fb2babb9de0e5d2;hb=33b744b35189baaa260f526cf117392095331843;hp=eda4e3a11a3d1129acbd8885ec67414db2b7638f;hpb=509e4aef44eb10e4aef1f81c3c3ff1214671503b;p=cascardo%2Flinux.git

diff --git a/arch/arm/plat-nomadik/gpio.c b/arch/arm/plat-nomadik/gpio.c
index eda4e3a11a3d..971e5d3798e4 100644
--- a/arch/arm/plat-nomadik/gpio.c
+++ b/arch/arm/plat-nomadik/gpio.c
@@ -35,16 +35,19 @@
  * Symbols in this file are called "nmk_gpio" for "nomadik gpio"
  */
 
-#define NMK_GPIO_PER_CHIP 32
 struct nmk_gpio_chip {
 	struct gpio_chip chip;
 	void __iomem *addr;
 	struct clk *clk;
+	unsigned int bank;
 	unsigned int parent_irq;
+	unsigned int secondary_parent_irq;
+	u32 (*get_secondary_status)(unsigned int bank);
 	spinlock_t lock;
 	/* Keep track of configured edges */
 	u32 edge_rising;
 	u32 edge_falling;
+	u32 backup[10];
 };
 
 static void __nmk_gpio_set_mode(struct nmk_gpio_chip *nmk_chip,
@@ -356,13 +359,13 @@ static inline int nmk_gpio_get_bitmask(int gpio)
 	return 1 << (gpio % 32);
 }
 
-static void nmk_gpio_irq_ack(unsigned int irq)
+static void nmk_gpio_irq_ack(struct irq_data *d)
 {
 	int gpio;
 	struct nmk_gpio_chip *nmk_chip;
 
-	gpio = NOMADIK_IRQ_TO_GPIO(irq);
-	nmk_chip = get_irq_chip_data(irq);
+	gpio = NOMADIK_IRQ_TO_GPIO(d->irq);
+	nmk_chip = irq_data_get_irq_chip_data(d);
 	if (!nmk_chip)
 		return;
 	writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC);
@@ -401,7 +404,7 @@ static void __nmk_gpio_irq_modify(struct nmk_gpio_chip *nmk_chip,
 	}
 }
 
-static int nmk_gpio_irq_modify(unsigned int irq, enum nmk_gpio_irq_type which,
+static int nmk_gpio_irq_modify(struct irq_data *d, enum nmk_gpio_irq_type which,
 			       bool enable)
 {
 	int gpio;
@@ -409,8 +412,8 @@ static int nmk_gpio_irq_modify(unsigned int irq, enum nmk_gpio_irq_type which,
 	unsigned long flags;
 	u32 bitmask;
 
-	gpio = NOMADIK_IRQ_TO_GPIO(irq);
-	nmk_chip = get_irq_chip_data(irq);
+	gpio = NOMADIK_IRQ_TO_GPIO(d->irq);
+	nmk_chip = irq_data_get_irq_chip_data(d);
 	bitmask = nmk_gpio_get_bitmask(gpio);
 	if (!nmk_chip)
 		return -EINVAL;
@@ -422,24 +425,24 @@ static int nmk_gpio_irq_modify(unsigned int irq, enum nmk_gpio_irq_type which,
 	return 0;
 }
 
-static void nmk_gpio_irq_mask(unsigned int irq)
+static void nmk_gpio_irq_mask(struct irq_data *d)
 {
-	nmk_gpio_irq_modify(irq, NORMAL, false);
+	nmk_gpio_irq_modify(d, NORMAL, false);
 }
 
-static void nmk_gpio_irq_unmask(unsigned int irq)
+static void nmk_gpio_irq_unmask(struct irq_data *d)
 {
-	nmk_gpio_irq_modify(irq, NORMAL, true);
+	nmk_gpio_irq_modify(d, NORMAL, true);
 }
 
-static int nmk_gpio_irq_set_wake(unsigned int irq, unsigned int on)
+static int nmk_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
 {
 	struct nmk_gpio_chip *nmk_chip;
 	unsigned long flags;
 	int gpio;
 
-	gpio = NOMADIK_IRQ_TO_GPIO(irq);
-	nmk_chip = get_irq_chip_data(irq);
+	gpio = NOMADIK_IRQ_TO_GPIO(d->irq);
+	nmk_chip = irq_data_get_irq_chip_data(d);
 	if (!nmk_chip)
 		return -EINVAL;
 
@@ -457,9 +460,9 @@ static int nmk_gpio_irq_set_wake(unsigned int irq, unsigned int on)
 	return 0;
 }
 
-static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)
+static int nmk_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 {
-	struct irq_desc *desc = irq_to_desc(irq);
+	struct irq_desc *desc = irq_to_desc(d->irq);
 	bool enabled = !(desc->status & IRQ_DISABLED);
 	bool wake = desc->wake_depth;
 	int gpio;
@@ -467,8 +470,8 @@ static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)
 	unsigned long flags;
 	u32 bitmask;
 
-	gpio = NOMADIK_IRQ_TO_GPIO(irq);
-	nmk_chip = get_irq_chip_data(irq);
+	gpio = NOMADIK_IRQ_TO_GPIO(d->irq);
+	nmk_chip = irq_data_get_irq_chip_data(d);
 	bitmask = nmk_gpio_get_bitmask(gpio);
 	if (!nmk_chip)
 		return -EINVAL;
@@ -507,37 +510,55 @@ static int nmk_gpio_irq_set_type(unsigned int irq, unsigned int type)
 
 static struct irq_chip nmk_gpio_irq_chip = {
 	.name		= "Nomadik-GPIO",
-	.ack		= nmk_gpio_irq_ack,
-	.mask		= nmk_gpio_irq_mask,
-	.unmask		= nmk_gpio_irq_unmask,
-	.set_type	= nmk_gpio_irq_set_type,
-	.set_wake	= nmk_gpio_irq_set_wake,
+	.irq_ack	= nmk_gpio_irq_ack,
+	.irq_mask	= nmk_gpio_irq_mask,
+	.irq_unmask	= nmk_gpio_irq_unmask,
+	.irq_set_type	= nmk_gpio_irq_set_type,
+	.irq_set_wake	= nmk_gpio_irq_set_wake,
 };
 
-static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+static void __nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc,
+				   u32 status)
 {
 	struct nmk_gpio_chip *nmk_chip;
 	struct irq_chip *host_chip = get_irq_chip(irq);
-	unsigned int gpio_irq;
-	u32 pending;
 	unsigned int first_irq;
 
-	if (host_chip->mask_ack)
-		host_chip->mask_ack(irq);
+	if (host_chip->irq_mask_ack)
+		host_chip->irq_mask_ack(&desc->irq_data);
 	else {
-		host_chip->mask(irq);
-		if (host_chip->ack)
-			host_chip->ack(irq);
+		host_chip->irq_mask(&desc->irq_data);
+		if (host_chip->irq_ack)
+			host_chip->irq_ack(&desc->irq_data);
 	}
 
 	nmk_chip = get_irq_data(irq);
 	first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
-	while ( (pending = readl(nmk_chip->addr + NMK_GPIO_IS)) ) {
-		gpio_irq = first_irq + __ffs(pending);
-		generic_handle_irq(gpio_irq);
+	while (status) {
+		int bit = __ffs(status);
+
+		generic_handle_irq(first_irq + bit);
+		status &= ~BIT(bit);
 	}
 
-	host_chip->unmask(irq);
+	host_chip->irq_unmask(&desc->irq_data);
+}
+
+static void nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+	struct nmk_gpio_chip *nmk_chip = get_irq_data(irq);
+	u32 status = readl(nmk_chip->addr + NMK_GPIO_IS);
+
+	__nmk_gpio_irq_handler(irq, desc, status);
+}
+
+static void nmk_gpio_secondary_irq_handler(unsigned int irq,
+					   struct irq_desc *desc)
+{
+	struct nmk_gpio_chip *nmk_chip = get_irq_data(irq);
+	u32 status = nmk_chip->get_secondary_status(nmk_chip->bank);
+
+	__nmk_gpio_irq_handler(irq, desc, status);
 }
 
 static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
@@ -546,15 +567,23 @@ static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
 	int i;
 
 	first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
-	for (i = first_irq; i < first_irq + NMK_GPIO_PER_CHIP; i++) {
+	for (i = first_irq; i < first_irq + nmk_chip->chip.ngpio; i++) {
 		set_irq_chip(i, &nmk_gpio_irq_chip);
 		set_irq_handler(i, handle_edge_irq);
 		set_irq_flags(i, IRQF_VALID);
 		set_irq_chip_data(i, nmk_chip);
 		set_irq_type(i, IRQ_TYPE_EDGE_FALLING);
 	}
+
 	set_irq_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
 	set_irq_data(nmk_chip->parent_irq, nmk_chip);
+
+	if (nmk_chip->secondary_parent_irq >= 0) {
+		set_irq_chained_handler(nmk_chip->secondary_parent_irq,
+					nmk_gpio_secondary_irq_handler);
+		set_irq_data(nmk_chip->secondary_parent_irq, nmk_chip);
+	}
+
 	return 0;
 }
 
@@ -605,6 +634,97 @@ static int nmk_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 	return NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base) + offset;
 }
 
+#ifdef CONFIG_DEBUG_FS
+
+#include <linux/seq_file.h>
+
+static void nmk_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
+{
+	int mode;
+	unsigned		i;
+	unsigned		gpio = chip->base;
+	int			is_out;
+	struct nmk_gpio_chip *nmk_chip =
+		container_of(chip, struct nmk_gpio_chip, chip);
+	const char *modes[] = {
+		[NMK_GPIO_ALT_GPIO]	= "gpio",
+		[NMK_GPIO_ALT_A]	= "altA",
+		[NMK_GPIO_ALT_B]	= "altB",
+		[NMK_GPIO_ALT_C]	= "altC",
+	};
+
+	for (i = 0; i < chip->ngpio; i++, gpio++) {
+		const char *label = gpiochip_is_requested(chip, i);
+		bool pull;
+		u32 bit = 1 << i;
+
+		if (!label)
+			continue;
+
+		is_out = readl(nmk_chip->addr + NMK_GPIO_DIR) & bit;
+		pull = !(readl(nmk_chip->addr + NMK_GPIO_PDIS) & bit);
+		mode = nmk_gpio_get_mode(gpio);
+		seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s %s",
+			gpio, label,
+			is_out ? "out" : "in ",
+			chip->get
+				? (chip->get(chip, i) ? "hi" : "lo")
+				: "?  ",
+			(mode < 0) ? "unknown" : modes[mode],
+			pull ? "pull" : "none");
+
+		if (!is_out) {
+			int		irq = gpio_to_irq(gpio);
+			struct irq_desc	*desc = irq_to_desc(irq);
+
+			/* This races with request_irq(), set_irq_type(),
+			 * and set_irq_wake() ... but those are "rare".
+			 *
+			 * More significantly, trigger type flags aren't
+			 * currently maintained by genirq.
+			 */
+			if (irq >= 0 && desc->action) {
+				char *trigger;
+
+				switch (desc->status & IRQ_TYPE_SENSE_MASK) {
+				case IRQ_TYPE_NONE:
+					trigger = "(default)";
+					break;
+				case IRQ_TYPE_EDGE_FALLING:
+					trigger = "edge-falling";
+					break;
+				case IRQ_TYPE_EDGE_RISING:
+					trigger = "edge-rising";
+					break;
+				case IRQ_TYPE_EDGE_BOTH:
+					trigger = "edge-both";
+					break;
+				case IRQ_TYPE_LEVEL_HIGH:
+					trigger = "level-high";
+					break;
+				case IRQ_TYPE_LEVEL_LOW:
+					trigger = "level-low";
+					break;
+				default:
+					trigger = "?trigger?";
+					break;
+				}
+
+				seq_printf(s, " irq-%d %s%s",
+					irq, trigger,
+					(desc->status & IRQ_WAKEUP)
+						? " wakeup" : "");
+			}
+		}
+
+		seq_printf(s, "\n");
+	}
+}
+
+#else
+#define nmk_gpio_dbg_show	NULL
+#endif
+
 /* This structure is replicated for each GPIO block allocated at probe time */
 static struct gpio_chip nmk_gpio_template = {
 	.direction_input	= nmk_gpio_make_input,
@@ -612,7 +732,7 @@ static struct gpio_chip nmk_gpio_template = {
 	.direction_output	= nmk_gpio_make_output,
 	.set			= nmk_gpio_set_output,
 	.to_irq			= nmk_gpio_to_irq,
-	.ngpio			= NMK_GPIO_PER_CHIP,
+	.dbg_show		= nmk_gpio_dbg_show,
 	.can_sleep		= 0,
 };
 
@@ -623,6 +743,7 @@ static int __devinit nmk_gpio_probe(struct platform_device *dev)
 	struct gpio_chip *chip;
 	struct resource *res;
 	struct clk *clk;
+	int secondary_irq;
 	int irq;
 	int ret;
 
@@ -641,6 +762,12 @@ static int __devinit nmk_gpio_probe(struct platform_device *dev)
 		goto out;
 	}
 
+	secondary_irq = platform_get_irq(dev, 1);
+	if (secondary_irq >= 0 && !pdata->get_secondary_status) {
+		ret = -EINVAL;
+		goto out;
+	}
+
 	if (request_mem_region(res->start, resource_size(res),
 			       dev_name(&dev->dev)) == NULL) {
 		ret = -EBUSY;
@@ -664,14 +791,18 @@ static int __devinit nmk_gpio_probe(struct platform_device *dev)
 	 * The virt address in nmk_chip->addr is in the nomadik register space,
 	 * so we can simply convert the resource address, without remapping
 	 */
+	nmk_chip->bank = dev->id;
 	nmk_chip->clk = clk;
 	nmk_chip->addr = io_p2v(res->start);
 	nmk_chip->chip = nmk_gpio_template;
 	nmk_chip->parent_irq = irq;
+	nmk_chip->secondary_parent_irq = secondary_irq;
+	nmk_chip->get_secondary_status = pdata->get_secondary_status;
 	spin_lock_init(&nmk_chip->lock);
 
 	chip = &nmk_chip->chip;
 	chip->base = pdata->first_gpio;
+	chip->ngpio = pdata->num_gpio;
 	chip->label = pdata->name ?: dev_name(&dev->dev);
 	chip->dev = &dev->dev;
 	chip->owner = THIS_MODULE;
@@ -701,14 +832,60 @@ out:
 	return ret;
 }
 
+#ifdef CONFIG_PM
+static int nmk_gpio_pm(struct platform_device *dev, bool suspend)
+{
+	struct nmk_gpio_chip *nmk_chip = platform_get_drvdata(dev);
+	int i;
+	static const unsigned int regs[] = {
+		NMK_GPIO_DAT,
+		NMK_GPIO_PDIS,
+		NMK_GPIO_DIR,
+		NMK_GPIO_AFSLA,
+		NMK_GPIO_AFSLB,
+		NMK_GPIO_SLPC,
+		NMK_GPIO_RIMSC,
+		NMK_GPIO_FIMSC,
+		NMK_GPIO_RWIMSC,
+		NMK_GPIO_FWIMSC,
+	};
+
+	BUILD_BUG_ON(ARRAY_SIZE(nmk_chip->backup) != ARRAY_SIZE(regs));
+
+	/* XXX: is this sufficient? what about pull-up/down configuration? */
+
+	for (i = 0; i < ARRAY_SIZE(regs); i++) {
+		if (suspend)
+			nmk_chip->backup[i] = readl(nmk_chip->addr + regs[i]);
+		else
+			writel(nmk_chip->backup[i], nmk_chip->addr + regs[i]);
+	}
+
+	return 0;
+}
+
+static int nmk_gpio_suspend(struct platform_device *dev, pm_message_t state)
+{
+	return nmk_gpio_pm(dev, true);
+}
+
+static int nmk_gpio_resume(struct platform_device *dev)
+{
+	return nmk_gpio_pm(dev, false);
+}
+#else
+#define nmk_gpio_suspend	NULL
+#define nmk_gpio_resume		NULL
+#endif
+
 static struct platform_driver nmk_gpio_driver = {
 	.driver = {
 		.owner = THIS_MODULE,
 		.name = "gpio",
 		},
 	.probe = nmk_gpio_probe,
-	.suspend = NULL, /* to be done */
-	.resume = NULL,
+	.suspend = nmk_gpio_suspend,
+	.resume = nmk_gpio_resume,
 };
 
 static int __init nmk_gpio_init(void)