1 files changed, 85 insertions, 35 deletions

diff --git a/drivers/gpio/gpio-tc3589x.c b/drivers/gpio/gpio-tc3589x.c
index 2a82e8999a42..1e48317e70fb 100644
--- a/drivers/gpio/gpio-tc3589x.c
+++ b/drivers/gpio/gpio-tc3589x.c
@@ -11,7 +11,9 @@
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/gpio.h>
+#include <linux/of.h>
 #include <linux/irq.h>
+#include <linux/irqdomain.h>
 #include <linux/interrupt.h>
 #include <linux/mfd/tc3589x.h>
 
@@ -29,6 +31,7 @@ struct tc3589x_gpio {
 	struct tc3589x *tc3589x;
 	struct device *dev;
 	struct mutex irq_lock;
+	struct irq_domain *domain;
 
 	int irq_base;
 
@@ -92,11 +95,28 @@ static int tc3589x_gpio_direction_input(struct gpio_chip *chip,
 	return tc3589x_set_bits(tc3589x, reg, 1 << pos, 0);
 }
 
+/**
+ * tc3589x_gpio_irq_get_virq(): Map an interrupt on a chip to a virtual IRQ
+ *
+ * @tc3589x_gpio: tc3589x_gpio_irq controller to operate on.
+ * @irq: index of the interrupt requested in the chip IRQs
+ *
+ * Useful for drivers to request their own IRQs.
+ */
+static int tc3589x_gpio_irq_get_virq(struct tc3589x_gpio *tc3589x_gpio,
+				     int irq)
+{
+	if (!tc3589x_gpio)
+		return -EINVAL;
+
+	return irq_create_mapping(tc3589x_gpio->domain, irq);
+}
+
 static int tc3589x_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
 {
 	struct tc3589x_gpio *tc3589x_gpio = to_tc3589x_gpio(chip);
 
-	return tc3589x_gpio->irq_base + offset;
+	return tc3589x_gpio_irq_get_virq(tc3589x_gpio, offset);
 }
 
 static struct gpio_chip template_chip = {
@@ -113,7 +133,7 @@ static struct gpio_chip template_chip = {
 static int tc3589x_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 {
 	struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
-	int offset = d->irq - tc3589x_gpio->irq_base;
+	int offset = d->hwirq;
 	int regoffset = offset / 8;
 	int mask = 1 << (offset % 8);
 
@@ -175,7 +195,7 @@ static void tc3589x_gpio_irq_sync_unlock(struct irq_data *d)
 static void tc3589x_gpio_irq_mask(struct irq_data *d)
 {
 	struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
-	int offset = d->irq - tc3589x_gpio->irq_base;
+	int offset = d->hwirq;
 	int regoffset = offset / 8;
 	int mask = 1 << (offset % 8);
 
@@ -185,7 +205,7 @@ static void tc3589x_gpio_irq_mask(struct irq_data *d)
 static void tc3589x_gpio_irq_unmask(struct irq_data *d)
 {
 	struct tc3589x_gpio *tc3589x_gpio = irq_data_get_irq_chip_data(d);
-	int offset = d->irq - tc3589x_gpio->irq_base;
+	int offset = d->hwirq;
 	int regoffset = offset / 8;
 	int mask = 1 << (offset % 8);
 
@@ -222,8 +242,9 @@ static irqreturn_t tc3589x_gpio_irq(int irq, void *dev)
 		while (stat) {
 			int bit = __ffs(stat);
 			int line = i * 8 + bit;
+			int virq = tc3589x_gpio_irq_get_virq(tc3589x_gpio, line);
 
-			handle_nested_irq(tc3589x_gpio->irq_base + line);
+			handle_nested_irq(virq);
 			stat &= ~(1 << bit);
 		}
 
@@ -233,51 +254,78 @@ static irqreturn_t tc3589x_gpio_irq(int irq, void *dev)
 	return IRQ_HANDLED;
 }
 
-static int tc3589x_gpio_irq_init(struct tc3589x_gpio *tc3589x_gpio)
+static int tc3589x_gpio_irq_map(struct irq_domain *d, unsigned int virq,
+				irq_hw_number_t hwirq)
 {
-	int base = tc3589x_gpio->irq_base;
-	int irq;
+	struct tc3589x *tc3589x_gpio = d->host_data;
 
-	for (irq = base; irq < base + tc3589x_gpio->chip.ngpio; irq++) {
-		irq_set_chip_data(irq, tc3589x_gpio);
-		irq_set_chip_and_handler(irq, &tc3589x_gpio_irq_chip,
-					 handle_simple_irq);
-		irq_set_nested_thread(irq, 1);
+	irq_set_chip_data(virq, tc3589x_gpio);
+	irq_set_chip_and_handler(virq, &tc3589x_gpio_irq_chip,
+				handle_simple_irq);
+	irq_set_nested_thread(virq, 1);
 #ifdef CONFIG_ARM
-		set_irq_flags(irq, IRQF_VALID);
+	set_irq_flags(virq, IRQF_VALID);
 #else
-		irq_set_noprobe(irq);
+	irq_set_noprobe(virq);
 #endif
-	}
 
 	return 0;
 }
 
-static void tc3589x_gpio_irq_remove(struct tc3589x_gpio *tc3589x_gpio)
+static void tc3589x_gpio_irq_unmap(struct irq_domain *d, unsigned int virq)
 {
-	int base = tc3589x_gpio->irq_base;
-	int irq;
-
-	for (irq = base; irq < base + tc3589x_gpio->chip.ngpio; irq++) {
 #ifdef CONFIG_ARM
-		set_irq_flags(irq, 0);
+	set_irq_flags(virq, 0);
 #endif
-		irq_set_chip_and_handler(irq, NULL, NULL);
-		irq_set_chip_data(irq, NULL);
+	irq_set_chip_and_handler(virq, NULL, NULL);
+	irq_set_chip_data(virq, NULL);
+}
+
+static struct irq_domain_ops tc3589x_irq_ops = {
+        .map    = tc3589x_gpio_irq_map,
+        .unmap  = tc3589x_gpio_irq_unmap,
+        .xlate  = irq_domain_xlate_twocell,
+};
+
+static int tc3589x_gpio_irq_init(struct tc3589x_gpio *tc3589x_gpio,
+				struct device_node *np)
+{
+	int base = tc3589x_gpio->irq_base;
+
+	if (base) {
+		tc3589x_gpio->domain = irq_domain_add_legacy(
+			NULL, tc3589x_gpio->chip.ngpio, base,
+			0, &tc3589x_irq_ops, tc3589x_gpio);
+	}
+	else {
+		tc3589x_gpio->domain = irq_domain_add_linear(
+			np, tc3589x_gpio->chip.ngpio,
+			&tc3589x_irq_ops, tc3589x_gpio);
+	}
+
+	if (!tc3589x_gpio->domain) {
+		dev_err(tc3589x_gpio->dev, "Failed to create irqdomain\n");
+		return -ENOSYS;
 	}
+
+	return 0;
 }
 
 static int __devinit tc3589x_gpio_probe(struct platform_device *pdev)
 {
 	struct tc3589x *tc3589x = dev_get_drvdata(pdev->dev.parent);
 	struct tc3589x_gpio_platform_data *pdata;
+	struct device_node *np = pdev->dev.of_node;
 	struct tc3589x_gpio *tc3589x_gpio;
 	int ret;
 	int irq;
 
 	pdata = tc3589x->pdata->gpio;
-	if (!pdata)
-		return -ENODEV;
+
+	if (!(pdata || np)) {
+		dev_err(&pdev->dev, "No platform data or Device Tree found\n");
+		return -EINVAL;
+	}
 
 	irq = platform_get_irq(pdev, 0);
 	if (irq < 0)
@@ -295,9 +343,14 @@ static int __devinit tc3589x_gpio_probe(struct platform_device *pdev)
 	tc3589x_gpio->chip = template_chip;
 	tc3589x_gpio->chip.ngpio = tc3589x->num_gpio;
 	tc3589x_gpio->chip.dev = &pdev->dev;
-	tc3589x_gpio->chip.base = pdata->gpio_base;
+	tc3589x_gpio->chip.base = (pdata) ? pdata->gpio_base : -1;
 
-	tc3589x_gpio->irq_base = tc3589x->irq_base + TC3589x_INT_GPIO(0);
+#ifdef CONFIG_OF_GPIO
+        tc3589x_gpio->chip.of_node = np;
+#endif
+
+	tc3589x_gpio->irq_base = tc3589x->irq_base ?
+		tc3589x->irq_base + TC3589x_INT_GPIO(0) : 0;
 
 	/* Bring the GPIO module out of reset */
 	ret = tc3589x_set_bits(tc3589x, TC3589x_RSTCTRL,
@@ -305,7 +358,7 @@ static int __devinit tc3589x_gpio_probe(struct platform_device *pdev)
 	if (ret < 0)
 		goto out_free;
 
-	ret = tc3589x_gpio_irq_init(tc3589x_gpio);
+	ret = tc3589x_gpio_irq_init(tc3589x_gpio, np);
 	if (ret)
 		goto out_free;
 
@@ -313,7 +366,7 @@ static int __devinit tc3589x_gpio_probe(struct platform_device *pdev)
 				   "tc3589x-gpio", tc3589x_gpio);
 	if (ret) {
 		dev_err(&pdev->dev, "unable to get irq: %d\n", ret);
-		goto out_removeirq;
+		goto out_free;
 	}
 
 	ret = gpiochip_add(&tc3589x_gpio->chip);
@@ -322,7 +375,7 @@ static int __devinit tc3589x_gpio_probe(struct platform_device *pdev)
 		goto out_freeirq;
 	}
 
-	if (pdata->setup)
+	if (pdata && pdata->setup)
 		pdata->setup(tc3589x, tc3589x_gpio->chip.base);
 
 	platform_set_drvdata(pdev, tc3589x_gpio);
@@ -331,8 +384,6 @@ static int __devinit tc3589x_gpio_probe(struct platform_device *pdev)
 
 out_freeirq:
 	free_irq(irq, tc3589x_gpio);
-out_removeirq:
-	tc3589x_gpio_irq_remove(tc3589x_gpio);
 out_free:
 	kfree(tc3589x_gpio);
 	return ret;
@@ -346,7 +397,7 @@ static int __devexit tc3589x_gpio_remove(struct platform_device *pdev)
 	int irq = platform_get_irq(pdev, 0);
 	int ret;
 
-	if (pdata->remove)
+	if (pdata && pdata->remove)
 		pdata->remove(tc3589x, tc3589x_gpio->chip.base);
 
 	ret = gpiochip_remove(&tc3589x_gpio->chip);
@@ -357,7 +408,6 @@ static int __devexit tc3589x_gpio_remove(struct platform_device *pdev)
 	}
 
 	free_irq(irq, tc3589x_gpio);
-	tc3589x_gpio_irq_remove(tc3589x_gpio);
 
 	platform_set_drvdata(pdev, NULL);
 	kfree(tc3589x_gpio);