1 files changed, 94 insertions, 28 deletions

diff --git a/arch/arm/mach-at91/gpio.c b/arch/arm/mach-at91/gpio.c
index ecf6bbb9103a..567df654a2e1 100644
--- a/arch/arm/mach-at91/gpio.c
+++ b/arch/arm/mach-at91/gpio.c
@@ -24,6 +24,7 @@
 #include <linux/irqdomain.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
+#include <linux/of_gpio.h>
 
 #include <mach/hardware.h>
 #include <mach/at91_pio.h>
@@ -34,6 +35,7 @@ struct at91_gpio_chip {
         struct gpio_chip        chip;
         struct at91_gpio_chip   *next;          /* Bank sharing same clock */
         int                     pioc_hwirq;     /* PIO bank interrupt identifier on AIC */
+        int                     pioc_virq;      /* PIO bank Linux virtual interrupt */
         int                     pioc_idx;       /* PIO bank index */
         void __iomem            *regbase;       /* PIO bank virtual address */
         struct clk              *clock;         /* associated clock */
@@ -292,7 +294,7 @@ static int gpio_irq_set_wake(struct irq_data *d, unsigned state)
         else
                 wakeups[bank] &= ~mask;
 
-        irq_set_irq_wake(gpio_chip[bank].pioc_hwirq, state);
+        irq_set_irq_wake(at91_gpio->pioc_virq, state);
 
         return 0;
 }
@@ -394,12 +396,12 @@ static struct irq_chip gpio_irqchip = {
 
 static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
 {
-        unsigned        virq;
         struct irq_data *idata = irq_desc_get_irq_data(desc);
         struct irq_chip *chip = irq_data_get_irq_chip(idata);
         struct at91_gpio_chip *at91_gpio = irq_data_get_irq_chip_data(idata);
         void __iomem    *pio = at91_gpio->regbase;
-        u32             isr;
+        unsigned long   isr;
+        int             n;
 
         /* temporarily mask (level sensitive) parent IRQ */
         chip->irq_ack(idata);
@@ -417,13 +419,10 @@ static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
                         continue;
                 }
 
-                virq = gpio_to_irq(at91_gpio->chip.base);
-
-                while (isr) {
-                        if (isr & 1)
-                                generic_handle_irq(virq);
-                        virq++;
-                        isr >>= 1;
+                n = find_first_bit(&isr, BITS_PER_LONG);
+                while (n < BITS_PER_LONG) {
+                        generic_handle_irq(irq_find_mapping(at91_gpio->domain, n));
+                        n = find_next_bit(&isr, BITS_PER_LONG, n + 1);
                 }
         }
         chip->irq_unmask(idata);
@@ -493,23 +492,91 @@ postcore_initcall(at91_gpio_debugfs_init);
 /*--------------------------------------------------------------------------*/
 
 /*
+ * This lock class tells lockdep that GPIO irqs are in a different
+ * category than their parents, so it won't report false recursion.
+ */
+static struct lock_class_key gpio_lock_class;
+
+#if defined(CONFIG_OF)
+static int at91_gpio_irq_map(struct irq_domain *h, unsigned int virq,
+                                                        irq_hw_number_t hw)
+{
+        struct at91_gpio_chip   *at91_gpio = h->host_data;
+
+        irq_set_lockdep_class(virq, &gpio_lock_class);
+
+        /*
+         * Can use the "simple" and not "edge" handler since it's
+         * shorter, and the AIC handles interrupts sanely.
+         */
+        irq_set_chip_and_handler(virq, &gpio_irqchip,
+                                 handle_simple_irq);
+        set_irq_flags(virq, IRQF_VALID);
+        irq_set_chip_data(virq, at91_gpio);
+
+        return 0;
+}
+
+static struct irq_domain_ops at91_gpio_ops = {
+        .map    = at91_gpio_irq_map,
+        .xlate  = irq_domain_xlate_twocell,
+};
+
+int __init at91_gpio_of_irq_setup(struct device_node *node,
+                                     struct device_node *parent)
+{
+        struct at91_gpio_chip   *prev = NULL;
+        int                     alias_idx = of_alias_get_id(node, "gpio");
+        struct at91_gpio_chip   *at91_gpio = &gpio_chip[alias_idx];
+
+        /* Disable irqs of this PIO controller */
+        __raw_writel(~0, at91_gpio->regbase + PIO_IDR);
+
+        /* Setup irq domain */
+        at91_gpio->domain = irq_domain_add_linear(node, at91_gpio->chip.ngpio,
+                                                &at91_gpio_ops, at91_gpio);
+        if (!at91_gpio->domain)
+                panic("at91_gpio.%d: couldn't allocate irq domain (DT).\n",
+                        at91_gpio->pioc_idx);
+
+        /* Setup chained handler */
+        if (at91_gpio->pioc_idx)
+                prev = &gpio_chip[at91_gpio->pioc_idx - 1];
+
+        /* The toplevel handler handles one bank of GPIOs, except
+         * on some SoC it can handles up to three...
+         * We only set up the handler for the first of the list.
+         */
+        if (prev && prev->next == at91_gpio)
+                return 0;
+
+        at91_gpio->pioc_virq = irq_create_mapping(irq_find_host(parent),
+                                                        at91_gpio->pioc_hwirq);
+        irq_set_chip_data(at91_gpio->pioc_virq, at91_gpio);
+        irq_set_chained_handler(at91_gpio->pioc_virq, gpio_irq_handler);
+
+        return 0;
+}
+#else
+int __init at91_gpio_of_irq_setup(struct device_node *node,
+                                     struct device_node *parent)
+{
+        return -EINVAL;
+}
+#endif
+
+/*
  * irqdomain initialization: pile up irqdomains on top of AIC range
  */
 static void __init at91_gpio_irqdomain(struct at91_gpio_chip *at91_gpio)
 {
         int irq_base;
-#if defined(CONFIG_OF)
-        struct device_node *of_node = at91_gpio->chip.of_node;
-#else
-        struct device_node *of_node = NULL;
-#endif
 
         irq_base = irq_alloc_descs(-1, 0, at91_gpio->chip.ngpio, 0);
         if (irq_base < 0)
                 panic("at91_gpio.%d: error %d: couldn't allocate IRQ numbers.\n",
                         at91_gpio->pioc_idx, irq_base);
-        at91_gpio->domain = irq_domain_add_legacy(of_node,
-                                                  at91_gpio->chip.ngpio,
+        at91_gpio->domain = irq_domain_add_legacy(NULL, at91_gpio->chip.ngpio,
                                                   irq_base, 0,
                                                   &irq_domain_simple_ops, NULL);
         if (!at91_gpio->domain)
@@ -518,12 +585,6 @@ static void __init at91_gpio_irqdomain(struct at91_gpio_chip *at91_gpio)
 }
 
 /*
- * This lock class tells lockdep that GPIO irqs are in a different
- * category than their parents, so it won't report false recursion.
- */
-static struct lock_class_key gpio_lock_class;
-
-/*
  * Called from the processor-specific init to enable GPIO interrupt support.
  */
 void __init at91_gpio_irq_setup(void)
@@ -535,8 +596,7 @@ void __init at91_gpio_irq_setup(void)
         for (pioc = 0, this = gpio_chip, prev = NULL;
                         pioc++ < gpio_banks;
                         prev = this, this++) {
-                unsigned        pioc_hwirq = this->pioc_hwirq;
-                int             offset;
+                int offset;
 
                 __raw_writel(~0, this->regbase + PIO_IDR);
 
@@ -566,8 +626,9 @@ void __init at91_gpio_irq_setup(void)
                 if (prev && prev->next == this)
                         continue;
 
-                irq_set_chip_data(pioc_hwirq, this);
-                irq_set_chained_handler(pioc_hwirq, gpio_irq_handler);
+                this->pioc_virq = irq_create_mapping(NULL, this->pioc_hwirq);
+                irq_set_chip_data(this->pioc_virq, this);
+                irq_set_chained_handler(this->pioc_virq, gpio_irq_handler);
         }
         pr_info("AT91: %d gpio irqs in %d banks\n", gpio_irqnbr, gpio_banks);
 }
@@ -645,7 +706,12 @@ static void at91_gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 static int at91_gpiolib_to_irq(struct gpio_chip *chip, unsigned offset)
 {
         struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);
-        int virq = irq_find_mapping(at91_gpio->domain, offset);
+        int virq;
+
+        if (offset < chip->ngpio)
+                virq = irq_create_mapping(at91_gpio->domain, offset);
+        else
+                virq = -ENXIO;
 
         dev_dbg(chip->dev, "%s: request IRQ for GPIO %d, return %d\n",
                                 chip->label, offset + chip->base, virq);