drivers/gpio: gpio-nomadik: Add support for irqdomains

Add irq domain support to the gpio-nomadik GPIO driver. This
enables its users to support dynamic IRQ assignment, which is
requried by Device Tree.

Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 58 insertions, 48 deletions

diff --git a/drivers/gpio/gpio-nomadik.c b/drivers/gpio/gpio-nomadik.c
index 06addfd797a..9b126b6d79c 100644
--- a/drivers/gpio/gpio-nomadik.c
+++ b/drivers/gpio/gpio-nomadik.c
@@ -22,6 +22,7 @@
 #include <linux/spinlock.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
+#include <linux/irqdomain.h>
 #include <linux/slab.h>
 
 #include <asm/mach/irq.h>
@@ -41,6 +42,7 @@
 
 struct nmk_gpio_chip {
         struct gpio_chip chip;
+        struct irq_domain *domain;
         void __iomem *addr;
         struct clk *clk;
         unsigned int bank;
@@ -393,7 +395,7 @@ static int __nmk_config_pins(pin_cfg_t *cfgs, int num, bool sleep)
                 struct nmk_gpio_chip *nmk_chip;
                 int pin = PIN_NUM(cfgs[i]);
 
-                nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(pin));
+                nmk_chip = nmk_gpio_chips[pin / NMK_GPIO_PER_CHIP];
                 if (!nmk_chip) {
                         ret = -EINVAL;
                         break;
@@ -401,7 +403,7 @@ static int __nmk_config_pins(pin_cfg_t *cfgs, int num, bool sleep)
 
                 clk_enable(nmk_chip->clk);
                 spin_lock(&nmk_chip->lock);
-                __nmk_config_pin(nmk_chip, pin - nmk_chip->chip.base,
+                __nmk_config_pin(nmk_chip, pin % NMK_GPIO_PER_CHIP,
                                  cfgs[i], sleep, glitch ? slpm : NULL);
                 spin_unlock(&nmk_chip->lock);
                 clk_disable(nmk_chip->clk);
@@ -485,7 +487,7 @@ int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode)
         struct nmk_gpio_chip *nmk_chip;
         unsigned long flags;
 
-        nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
+        nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
         if (!nmk_chip)
                 return -EINVAL;
 
@@ -493,7 +495,7 @@ int nmk_gpio_set_slpm(int gpio, enum nmk_gpio_slpm mode)
         spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
         spin_lock(&nmk_chip->lock);
 
-        __nmk_gpio_set_slpm(nmk_chip, gpio - nmk_chip->chip.base, mode);
+        __nmk_gpio_set_slpm(nmk_chip, gpio % NMK_GPIO_PER_CHIP, mode);
 
         spin_unlock(&nmk_chip->lock);
         spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
@@ -520,13 +522,13 @@ int nmk_gpio_set_pull(int gpio, enum nmk_gpio_pull pull)
         struct nmk_gpio_chip *nmk_chip;
         unsigned long flags;
 
-        nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
+        nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
         if (!nmk_chip)
                 return -EINVAL;
 
         clk_enable(nmk_chip->clk);
         spin_lock_irqsave(&nmk_chip->lock, flags);
-        __nmk_gpio_set_pull(nmk_chip, gpio - nmk_chip->chip.base, pull);
+        __nmk_gpio_set_pull(nmk_chip, gpio % NMK_GPIO_PER_CHIP, pull);
         spin_unlock_irqrestore(&nmk_chip->lock, flags);
         clk_disable(nmk_chip->clk);
 
@@ -548,13 +550,13 @@ int nmk_gpio_set_mode(int gpio, int gpio_mode)
         struct nmk_gpio_chip *nmk_chip;
         unsigned long flags;
 
-        nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
+        nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
         if (!nmk_chip)
                 return -EINVAL;
 
         clk_enable(nmk_chip->clk);
         spin_lock_irqsave(&nmk_chip->lock, flags);
-        __nmk_gpio_set_mode(nmk_chip, gpio - nmk_chip->chip.base, gpio_mode);
+        __nmk_gpio_set_mode(nmk_chip, gpio % NMK_GPIO_PER_CHIP, gpio_mode);
         spin_unlock_irqrestore(&nmk_chip->lock, flags);
         clk_disable(nmk_chip->clk);
 
@@ -567,11 +569,11 @@ int nmk_gpio_get_mode(int gpio)
         struct nmk_gpio_chip *nmk_chip;
         u32 afunc, bfunc, bit;
 
-        nmk_chip = irq_get_chip_data(NOMADIK_GPIO_TO_IRQ(gpio));
+        nmk_chip = nmk_gpio_chips[gpio / NMK_GPIO_PER_CHIP];
         if (!nmk_chip)
                 return -EINVAL;
 
-        bit = 1 << (gpio - nmk_chip->chip.base);
+        bit = 1 << (gpio % NMK_GPIO_PER_CHIP);
 
         clk_enable(nmk_chip->clk);
 
@@ -588,21 +590,19 @@ EXPORT_SYMBOL(nmk_gpio_get_mode);
 /* IRQ functions */
 static inline int nmk_gpio_get_bitmask(int gpio)
 {
-        return 1 << (gpio % 32);
+        return 1 << (gpio % NMK_GPIO_PER_CHIP);
 }
 
 static void nmk_gpio_irq_ack(struct irq_data *d)
 {
-        int gpio;
         struct nmk_gpio_chip *nmk_chip;
 
-        gpio = NOMADIK_IRQ_TO_GPIO(d->irq);
         nmk_chip = irq_data_get_irq_chip_data(d);
         if (!nmk_chip)
                 return;
 
         clk_enable(nmk_chip->clk);
-        writel(nmk_gpio_get_bitmask(gpio), nmk_chip->addr + NMK_GPIO_IC);
+        writel(nmk_gpio_get_bitmask(d->hwirq), nmk_chip->addr + NMK_GPIO_IC);
         clk_disable(nmk_chip->clk);
 }
 
@@ -659,7 +659,7 @@ static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip,
          * wakeup is anyhow controlled by the RIMSC and FIMSC registers.
          */
         if (nmk_chip->sleepmode && on) {
-                __nmk_gpio_set_slpm(nmk_chip, gpio - nmk_chip->chip.base,
+                __nmk_gpio_set_slpm(nmk_chip, gpio % nmk_chip->chip.base,
                                     NMK_GPIO_SLPM_WAKEUP_ENABLE);
         }
 
@@ -668,14 +668,12 @@ static void __nmk_gpio_set_wake(struct nmk_gpio_chip *nmk_chip,
 
 static int nmk_gpio_irq_maskunmask(struct irq_data *d, bool enable)
 {
-        int gpio;
         struct nmk_gpio_chip *nmk_chip;
         unsigned long flags;
         u32 bitmask;
 
-        gpio = NOMADIK_IRQ_TO_GPIO(d->irq);
         nmk_chip = irq_data_get_irq_chip_data(d);
-        bitmask = nmk_gpio_get_bitmask(gpio);
+        bitmask = nmk_gpio_get_bitmask(d->hwirq);
         if (!nmk_chip)
                 return -EINVAL;
 
@@ -683,10 +681,10 @@ static int nmk_gpio_irq_maskunmask(struct irq_data *d, bool enable)
         spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
         spin_lock(&nmk_chip->lock);
 
-        __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, enable);
+        __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, enable);
 
         if (!(nmk_chip->real_wake & bitmask))
-                __nmk_gpio_set_wake(nmk_chip, gpio, enable);
+                __nmk_gpio_set_wake(nmk_chip, d->hwirq, enable);
 
         spin_unlock(&nmk_chip->lock);
         spin_unlock_irqrestore(&nmk_gpio_slpm_lock, flags);
@@ -710,20 +708,18 @@ static int nmk_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
         struct nmk_gpio_chip *nmk_chip;
         unsigned long flags;
         u32 bitmask;
-        int gpio;
 
-        gpio = NOMADIK_IRQ_TO_GPIO(d->irq);
         nmk_chip = irq_data_get_irq_chip_data(d);
         if (!nmk_chip)
                 return -EINVAL;
-        bitmask = nmk_gpio_get_bitmask(gpio);
+        bitmask = nmk_gpio_get_bitmask(d->hwirq);
 
         clk_enable(nmk_chip->clk);
         spin_lock_irqsave(&nmk_gpio_slpm_lock, flags);
         spin_lock(&nmk_chip->lock);
 
         if (irqd_irq_disabled(d))
-                __nmk_gpio_set_wake(nmk_chip, gpio, on);
+                __nmk_gpio_set_wake(nmk_chip, d->hwirq, on);
 
         if (on)
                 nmk_chip->real_wake |= bitmask;
@@ -741,17 +737,14 @@ static int nmk_gpio_irq_set_type(struct irq_data *d, unsigned int type)
 {
         bool enabled = !irqd_irq_disabled(d);
         bool wake = irqd_is_wakeup_set(d);
-        int gpio;
         struct nmk_gpio_chip *nmk_chip;
         unsigned long flags;
         u32 bitmask;
 
-        gpio = NOMADIK_IRQ_TO_GPIO(d->irq);
         nmk_chip = irq_data_get_irq_chip_data(d);
-        bitmask = nmk_gpio_get_bitmask(gpio);
+        bitmask = nmk_gpio_get_bitmask(d->hwirq);
         if (!nmk_chip)
                 return -EINVAL;
-
         if (type & IRQ_TYPE_LEVEL_HIGH)
                 return -EINVAL;
         if (type & IRQ_TYPE_LEVEL_LOW)
@@ -761,10 +754,10 @@ static int nmk_gpio_irq_set_type(struct irq_data *d, unsigned int type)
         spin_lock_irqsave(&nmk_chip->lock, flags);
 
         if (enabled)
-                __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, false);
+                __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, false);
 
         if (enabled || wake)
-                __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, false);
+                __nmk_gpio_irq_modify(nmk_chip, d->hwirq, WAKE, false);
 
         nmk_chip->edge_rising &= ~bitmask;
         if (type & IRQ_TYPE_EDGE_RISING)
@@ -775,10 +768,10 @@ static int nmk_gpio_irq_set_type(struct irq_data *d, unsigned int type)
                 nmk_chip->edge_falling |= bitmask;
 
         if (enabled)
-                __nmk_gpio_irq_modify(nmk_chip, gpio, NORMAL, true);
+                __nmk_gpio_irq_modify(nmk_chip, d->hwirq, NORMAL, true);
 
         if (enabled || wake)
-                __nmk_gpio_irq_modify(nmk_chip, gpio, WAKE, true);
+                __nmk_gpio_irq_modify(nmk_chip, d->hwirq, WAKE, true);
 
         spin_unlock_irqrestore(&nmk_chip->lock, flags);
         clk_disable(nmk_chip->clk);
@@ -824,7 +817,7 @@ static void __nmk_gpio_irq_handler(unsigned int irq, struct irq_desc *desc,
         chained_irq_enter(host_chip, desc);
 
         nmk_chip = irq_get_handler_data(irq);
-        first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
+        first_irq = nmk_chip->domain->revmap_data.legacy.first_irq;
         while (status) {
                 int bit = __ffs(status);
 
@@ -858,18 +851,6 @@ static void nmk_gpio_secondary_irq_handler(unsigned int irq,
 
 static int nmk_gpio_init_irq(struct nmk_gpio_chip *nmk_chip)
 {
-        unsigned int first_irq;
-        int i;
-
-        first_irq = NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base);
-        for (i = first_irq; i < first_irq + nmk_chip->chip.ngpio; i++) {
-                irq_set_chip_and_handler(i, &nmk_gpio_irq_chip,
-                                         handle_edge_irq);
-                set_irq_flags(i, IRQF_VALID);
-                irq_set_chip_data(i, nmk_chip);
-                irq_set_irq_type(i, IRQ_TYPE_EDGE_FALLING);
-        }
-
         irq_set_chained_handler(nmk_chip->parent_irq, nmk_gpio_irq_handler);
         irq_set_handler_data(nmk_chip->parent_irq, nmk_chip);
 
@@ -946,7 +927,7 @@ static int nmk_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
         struct nmk_gpio_chip *nmk_chip =
                 container_of(chip, struct nmk_gpio_chip, chip);
 
-        return NOMADIK_GPIO_TO_IRQ(nmk_chip->chip.base) + offset;
+        return irq_find_mapping(nmk_chip->domain, offset);
 }
 
 #ifdef CONFIG_DEBUG_FS
@@ -1129,6 +1110,27 @@ void nmk_gpio_read_pull(int gpio_bank, u32 *pull_up)
         }
 }
 
+int nmk_gpio_irq_map(struct irq_domain *d, unsigned int irq,
+                          irq_hw_number_t hwirq)
+{
+        struct nmk_gpio_chip *nmk_chip = d->host_data;
+
+        if (!nmk_chip)
+                return -EINVAL;
+
+        irq_set_chip_and_handler(irq, &nmk_gpio_irq_chip, handle_edge_irq);
+        set_irq_flags(irq, IRQF_VALID);
+        irq_set_chip_data(irq, nmk_chip);
+        irq_set_irq_type(irq, IRQ_TYPE_EDGE_FALLING);
+
+        return 0;
+}
+
+const struct irq_domain_ops nmk_gpio_irq_simple_ops = {
+        .map = nmk_gpio_irq_map,
+        .xlate = irq_domain_xlate_twocell,
+};
+
 static int __devinit nmk_gpio_probe(struct platform_device *dev)
 {
         struct nmk_gpio_platform_data *pdata = dev->dev.platform_data;
@@ -1158,7 +1160,7 @@ static int __devinit nmk_gpio_probe(struct platform_device *dev)
                 if (of_property_read_u32(np, "gpio-bank", &dev->id)) {
                         dev_err(&dev->dev, "gpio-bank property not found\n");
                         ret = -EINVAL;
-                        goto out_dt;
+                        goto out;
                 }
 
                 pdata->first_gpio = dev->id * NMK_GPIO_PER_CHIP;
@@ -1245,6 +1247,15 @@ static int __devinit nmk_gpio_probe(struct platform_device *dev)
 
         platform_set_drvdata(dev, nmk_chip);
 
+        nmk_chip->domain = irq_domain_add_legacy(np, NMK_GPIO_PER_CHIP,
+                                                NOMADIK_GPIO_TO_IRQ(pdata->first_gpio),
+                                                0, &nmk_gpio_irq_simple_ops, nmk_chip);
+        if (!nmk_chip->domain) {
+                pr_err("%s: Failed to create irqdomain\n", np->full_name);
+                ret = -ENOSYS;
+                goto out_free;
+        }
+
         nmk_gpio_init_irq(nmk_chip);
 
         dev_info(&dev->dev, "at address %p\n", nmk_chip->addr);
@@ -1263,7 +1274,6 @@ out_release:
 out:
         dev_err(&dev->dev, "Failure %i for GPIO %i-%i\n", ret,
                   pdata->first_gpio, pdata->first_gpio+31);
-out_dt:
         if (np)
                 kfree(pdata);