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ar71xx: add support to use gpio irqs

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Signed-off-by: Günther Kelleter <guenther.kelleter@devolo.de>

SVN-Revision: 46339
This commit is contained in:
John Crispin 2015-07-14 07:34:31 +00:00
parent 02984a6e09
commit 052f21de3b
1 changed files with 224 additions and 0 deletions
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224
target/linux/ar71xx/patches-3.18/739-MIPS-ath79-add-gpio-irq-support.patch Normal file
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@ -0,0 +1,224 @@
--- a/arch/mips/ath79/gpio.c
+++ b/arch/mips/ath79/gpio.c
@@ -20,9 +20,14 @@
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/gpio.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+
+#include <linux/of.h>
#include <asm/mach-ath79/ar71xx_regs.h>
#include <asm/mach-ath79/ath79.h>
+#include <asm/mach-ath79/irq.h>
#include "common.h"
void __iomem *ath79_gpio_base;
@@ -31,6 +36,13 @@ EXPORT_SYMBOL_GPL(ath79_gpio_base);
static unsigned long ath79_gpio_count;
static DEFINE_SPINLOCK(ath79_gpio_lock);
+/*
+ * gpio_both_edge is a bitmask of which gpio pins need to have
+ * the detect priority flipped from the interrupt handler to
+ * emulate IRQ_TYPE_EDGE_BOTH.
+ */
+static unsigned long gpio_both_edge = 0;
+
static void __ath79_gpio_set_value(unsigned gpio, int value)
{
void __iomem *base = ath79_gpio_base;
@@ -209,6 +221,132 @@ void __init ath79_gpio_output_select(uns
spin_unlock_irqrestore(&ath79_gpio_lock, flags);
}
+static int ath79_gpio_irq_type(struct irq_data *d, unsigned type)
+{
+ int offset = d->irq - ATH79_GPIO_IRQ_BASE;
+ void __iomem *base = ath79_gpio_base;
+ unsigned long flags;
+ unsigned long int_type;
+ unsigned long int_polarity;
+ unsigned long bit = (1 << offset);
+
+ spin_lock_irqsave(&ath79_gpio_lock, flags);
+
+ int_type = __raw_readl(base + AR71XX_GPIO_REG_INT_TYPE);
+ int_polarity = __raw_readl(base + AR71XX_GPIO_REG_INT_POLARITY);
+
+ gpio_both_edge &= ~bit;
+
+ switch (type) {
+ case IRQ_TYPE_EDGE_RISING:
+ int_type &= ~bit;
+ int_polarity |= bit;
+ break;
+
+ case IRQ_TYPE_EDGE_FALLING:
+ int_type &= ~bit;
+ int_polarity &= ~bit;
+ break;
+
+ case IRQ_TYPE_LEVEL_HIGH:
+ int_type |= bit;
+ int_polarity |= bit;
+ break;
+
+ case IRQ_TYPE_LEVEL_LOW:
+ int_type |= bit;
+ int_polarity &= ~bit;
+ break;
+
+ case IRQ_TYPE_EDGE_BOTH:
+ int_type |= bit;
+ /* set polarity based on current value */
+ if (gpio_get_value(offset)) {
+ int_polarity &= ~bit;
+ } else {
+ int_polarity |= bit;
+ }
+ /* flip this gpio in the interrupt handler */
+ gpio_both_edge |= bit;
+ break;
+
+ default:
+ spin_unlock_irqrestore(&ath79_gpio_lock, flags);
+ return -EINVAL;
+ }
+
+ __raw_writel(int_type, base + AR71XX_GPIO_REG_INT_TYPE);
+ __raw_writel(int_polarity, base + AR71XX_GPIO_REG_INT_POLARITY);
+
+ __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_INT_MODE) | (1 << offset),
+ base + AR71XX_GPIO_REG_INT_MODE);
+
+ __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_INT_ENABLE) & ~(1 << offset),
+ base + AR71XX_GPIO_REG_INT_ENABLE);
+
+ spin_unlock_irqrestore(&ath79_gpio_lock, flags);
+ return 0;
+}
+
+static void ath79_gpio_irq_enable(struct irq_data *d)
+{
+ int offset = d->irq - ATH79_GPIO_IRQ_BASE;
+ void __iomem *base = ath79_gpio_base;
+
+ __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_INT_ENABLE) | (1 << offset),
+ base + AR71XX_GPIO_REG_INT_ENABLE);
+}
+
+static void ath79_gpio_irq_disable(struct irq_data *d)
+{
+ int offset = d->irq - ATH79_GPIO_IRQ_BASE;
+ void __iomem *base = ath79_gpio_base;
+
+ __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_INT_ENABLE) & ~(1 << offset),
+ base + AR71XX_GPIO_REG_INT_ENABLE);
+}
+
+static struct irq_chip ath79_gpio_irqchip = {
+ .name = "GPIO",
+ .irq_enable = ath79_gpio_irq_enable,
+ .irq_disable = ath79_gpio_irq_disable,
+ .irq_set_type = ath79_gpio_irq_type,
+};
+
+static irqreturn_t ath79_gpio_irq(int irq, void *dev)
+{
+ void __iomem *base = ath79_gpio_base;
+ unsigned long stat = __raw_readl(base + AR71XX_GPIO_REG_INT_PENDING);
+ int bit_num;
+
+ for_each_set_bit(bit_num, &stat, sizeof(stat) * BITS_PER_BYTE) {
+ unsigned long bit = BIT(bit_num);
+
+ if (bit & gpio_both_edge) {
+ __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_INT_POLARITY) ^ bit,
+ base + AR71XX_GPIO_REG_INT_POLARITY);
+ }
+
+ generic_handle_irq(ATH79_GPIO_IRQ(bit_num));
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int __init ath79_gpio_irq_init(struct gpio_chip *chip)
+{
+ int irq;
+ int irq_base = ATH79_GPIO_IRQ_BASE;
+
+ for (irq = irq_base; irq < irq_base + chip->ngpio; irq++) {
+ irq_set_chip_data(irq, chip);
+ irq_set_chip_and_handler(irq, &ath79_gpio_irqchip, handle_simple_irq);
+ irq_set_noprobe(irq);
+ }
+
+ return 0;
+}
+
void __init ath79_gpio_init(void)
{
int err;
@@ -245,6 +383,10 @@ void __init ath79_gpio_init(void)
err = gpiochip_add(&ath79_gpio_chip);
if (err)
panic("cannot add AR71xx GPIO chip, error=%d", err);
+
+ ath79_gpio_irq_init(&ath79_gpio_chip);
+
+ request_irq(ATH79_MISC_IRQ(2), ath79_gpio_irq, 0, "ath79-gpio", NULL);
}
int gpio_get_value(unsigned gpio)
@@ -267,14 +409,22 @@ EXPORT_SYMBOL(gpio_set_value);
int gpio_to_irq(unsigned gpio)
{
- /* FIXME */
- return -EINVAL;
+ if (gpio > ath79_gpio_count) {
+ return -EINVAL;
+ }
+
+ return ATH79_GPIO_IRQ_BASE + gpio;
}
EXPORT_SYMBOL(gpio_to_irq);
int irq_to_gpio(unsigned irq)
{
- /* FIXME */
- return -EINVAL;
+ unsigned gpio = irq - ATH79_GPIO_IRQ_BASE;
+
+ if (gpio > ath79_gpio_count) {
+ return -EINVAL;
+ }
+
+ return gpio;
}
EXPORT_SYMBOL(irq_to_gpio);
--- a/arch/mips/include/asm/mach-ath79/irq.h
+++ b/arch/mips/include/asm/mach-ath79/irq.h
@@ -10,7 +10,7 @@
#define __ASM_MACH_ATH79_IRQ_H
#define MIPS_CPU_IRQ_BASE 0
-#define NR_IRQS 51
+#define NR_IRQS 83
#define ATH79_CPU_IRQ(_x) (MIPS_CPU_IRQ_BASE + (_x))
@@ -30,6 +30,10 @@
#define ATH79_IP3_IRQ_COUNT 3
#define ATH79_IP3_IRQ(_x) (ATH79_IP3_IRQ_BASE + (_x))
+#define ATH79_GPIO_IRQ_BASE (ATH79_IP3_IRQ_BASE + ATH79_IP3_IRQ_COUNT)
+#define ATH79_GPIO_IRQ_COUNT 32
+#define ATH79_GPIO_IRQ(_x) (ATH79_GPIO_IRQ_BASE + (_x))
+
#include_next <irq.h>
#endif /* __ASM_MACH_ATH79_IRQ_H */