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-rw-r--r--arch/avr32/mach-at32ap/Makefile2
-rw-r--r--arch/avr32/mach-at32ap/at32ap7000.c2
-rw-r--r--arch/avr32/mach-at32ap/pio.c233
3 files changed, 221 insertions, 16 deletions
diff --git a/arch/avr32/mach-at32ap/Makefile b/arch/avr32/mach-at32ap/Makefile
index f62eb691551..b21bea9af8b 100644
--- a/arch/avr32/mach-at32ap/Makefile
+++ b/arch/avr32/mach-at32ap/Makefile
@@ -1,2 +1,2 @@
-obj-y += at32ap.o clock.o pio.o intc.o extint.o hsmc.o
+obj-y += at32ap.o clock.o intc.o extint.o pio.o hsmc.o
obj-$(CONFIG_CPU_AT32AP7000) += at32ap7000.o
diff --git a/arch/avr32/mach-at32ap/at32ap7000.c b/arch/avr32/mach-at32ap/at32ap7000.c
index 175853a3c32..21561ab6047 100644
--- a/arch/avr32/mach-at32ap/at32ap7000.c
+++ b/arch/avr32/mach-at32ap/at32ap7000.c
@@ -498,7 +498,7 @@ DEV_CLK(mck, pio3, pba, 13);
void __init at32_add_system_devices(void)
{
- system_manager.eim_first_irq = NR_INTERNAL_IRQS;
+ system_manager.eim_first_irq = EIM_IRQ_BASE;
platform_device_register(&at32_sm_device);
platform_device_register(&at32_intc0_device);
diff --git a/arch/avr32/mach-at32ap/pio.c b/arch/avr32/mach-at32ap/pio.c
index f1280ed8ed6..17e835de95c 100644
--- a/arch/avr32/mach-at32ap/pio.c
+++ b/arch/avr32/mach-at32ap/pio.c
@@ -12,7 +12,9 @@
#include <linux/debugfs.h>
#include <linux/fs.h>
#include <linux/platform_device.h>
+#include <linux/irq.h>
+#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/arch/portmux.h>
@@ -26,7 +28,8 @@ struct pio_device {
const struct platform_device *pdev;
struct clk *clk;
u32 pinmux_mask;
- char name[32];
+ u32 gpio_mask;
+ char name[8];
};
static struct pio_device pio_dev[MAX_NR_PIO_DEVICES];
@@ -76,6 +79,9 @@ void __init at32_select_periph(unsigned int pin, unsigned int periph,
if (!(flags & AT32_GPIOF_PULLUP))
pio_writel(pio, PUDR, mask);
+ /* gpio_request NOT allowed */
+ set_bit(pin_index, &pio->gpio_mask);
+
return;
fail:
@@ -99,19 +105,29 @@ void __init at32_select_gpio(unsigned int pin, unsigned long flags)
goto fail;
}
- pio_writel(pio, PUER, mask);
- if (flags & AT32_GPIOF_HIGH)
- pio_writel(pio, SODR, mask);
- else
- pio_writel(pio, CODR, mask);
- if (flags & AT32_GPIOF_OUTPUT)
+ if (flags & AT32_GPIOF_OUTPUT) {
+ if (flags & AT32_GPIOF_HIGH)
+ pio_writel(pio, SODR, mask);
+ else
+ pio_writel(pio, CODR, mask);
+ pio_writel(pio, PUDR, mask);
pio_writel(pio, OER, mask);
- else
+ } else {
+ if (flags & AT32_GPIOF_PULLUP)
+ pio_writel(pio, PUER, mask);
+ else
+ pio_writel(pio, PUDR, mask);
+ if (flags & AT32_GPIOF_DEGLITCH)
+ pio_writel(pio, IFER, mask);
+ else
+ pio_writel(pio, IFDR, mask);
pio_writel(pio, ODR, mask);
+ }
pio_writel(pio, PER, mask);
- if (!(flags & AT32_GPIOF_PULLUP))
- pio_writel(pio, PUDR, mask);
+
+ /* gpio_request now allowed */
+ clear_bit(pin_index, &pio->gpio_mask);
return;
@@ -119,20 +135,199 @@ fail:
dump_stack();
}
+/*--------------------------------------------------------------------------*/
+
+/*--------------------------------------------------------------------------*/
+
+/* GPIO API */
+
+int gpio_request(unsigned int gpio, const char *label)
+{
+ struct pio_device *pio;
+ unsigned int pin;
+
+ pio = gpio_to_pio(gpio);
+ if (!pio)
+ return -ENODEV;
+
+ pin = gpio & 0x1f;
+ if (test_and_set_bit(pin, &pio->gpio_mask))
+ return -EBUSY;
+
+ return 0;
+}
+EXPORT_SYMBOL(gpio_request);
+
+void gpio_free(unsigned int gpio)
+{
+ struct pio_device *pio;
+ unsigned int pin;
+
+ pio = gpio_to_pio(gpio);
+ if (!pio) {
+ printk(KERN_ERR
+ "gpio: attempted to free invalid pin %u\n", gpio);
+ return;
+ }
+
+ pin = gpio & 0x1f;
+ if (!test_and_clear_bit(pin, &pio->gpio_mask))
+ printk(KERN_ERR "gpio: freeing free or non-gpio pin %s-%u\n",
+ pio->name, pin);
+}
+EXPORT_SYMBOL(gpio_free);
+
+int gpio_direction_input(unsigned int gpio)
+{
+ struct pio_device *pio;
+ unsigned int pin;
+
+ pio = gpio_to_pio(gpio);
+ if (!pio)
+ return -ENODEV;
+
+ pin = gpio & 0x1f;
+ pio_writel(pio, ODR, 1 << pin);
+
+ return 0;
+}
+EXPORT_SYMBOL(gpio_direction_input);
+
+int gpio_direction_output(unsigned int gpio)
+{
+ struct pio_device *pio;
+ unsigned int pin;
+
+ pio = gpio_to_pio(gpio);
+ if (!pio)
+ return -ENODEV;
+
+ pin = gpio & 0x1f;
+ pio_writel(pio, OER, 1 << pin);
+
+ return 0;
+}
+EXPORT_SYMBOL(gpio_direction_output);
+
+int gpio_get_value(unsigned int gpio)
+{
+ struct pio_device *pio = &pio_dev[gpio >> 5];
+
+ return (pio_readl(pio, PDSR) >> (gpio & 0x1f)) & 1;
+}
+EXPORT_SYMBOL(gpio_get_value);
+
+void gpio_set_value(unsigned int gpio, int value)
+{
+ struct pio_device *pio = &pio_dev[gpio >> 5];
+ u32 mask;
+
+ mask = 1 << (gpio & 0x1f);
+ if (value)
+ pio_writel(pio, SODR, mask);
+ else
+ pio_writel(pio, CODR, mask);
+}
+EXPORT_SYMBOL(gpio_set_value);
+
+/*--------------------------------------------------------------------------*/
+
+/* GPIO IRQ support */
+
+static void gpio_irq_mask(unsigned irq)
+{
+ unsigned gpio = irq_to_gpio(irq);
+ struct pio_device *pio = &pio_dev[gpio >> 5];
+
+ pio_writel(pio, IDR, 1 << (gpio & 0x1f));
+}
+
+static void gpio_irq_unmask(unsigned irq)
+{
+ unsigned gpio = irq_to_gpio(irq);
+ struct pio_device *pio = &pio_dev[gpio >> 5];
+
+ pio_writel(pio, IER, 1 << (gpio & 0x1f));
+}
+
+static int gpio_irq_type(unsigned irq, unsigned type)
+{
+ if (type != IRQ_TYPE_EDGE_BOTH && type != IRQ_TYPE_NONE)
+ return -EINVAL;
+
+ return 0;
+}
+
+static struct irq_chip gpio_irqchip = {
+ .name = "gpio",
+ .mask = gpio_irq_mask,
+ .unmask = gpio_irq_unmask,
+ .set_type = gpio_irq_type,
+};
+
+static void gpio_irq_handler(unsigned irq, struct irq_desc *desc)
+{
+ struct pio_device *pio = get_irq_chip_data(irq);
+ unsigned gpio_irq;
+
+ gpio_irq = (unsigned) get_irq_data(irq);
+ for (;;) {
+ u32 isr;
+ struct irq_desc *d;
+
+ /* ack pending GPIO interrupts */
+ isr = pio_readl(pio, ISR) & pio_readl(pio, IMR);
+ if (!isr)
+ break;
+ do {
+ int i;
+
+ i = ffs(isr) - 1;
+ isr &= ~(1 << i);
+
+ i += gpio_irq;
+ d = &irq_desc[i];
+
+ d->handle_irq(i, d);
+ } while (isr);
+ }
+}
+
+static void __init
+gpio_irq_setup(struct pio_device *pio, int irq, int gpio_irq)
+{
+ unsigned i;
+
+ set_irq_chip_data(irq, pio);
+ set_irq_data(irq, (void *) gpio_irq);
+
+ for (i = 0; i < 32; i++, gpio_irq++) {
+ set_irq_chip_data(gpio_irq, pio);
+ set_irq_chip_and_handler(gpio_irq, &gpio_irqchip,
+ handle_simple_irq);
+ }
+
+ set_irq_chained_handler(irq, gpio_irq_handler);
+}
+
+/*--------------------------------------------------------------------------*/
+
static int __init pio_probe(struct platform_device *pdev)
{
struct pio_device *pio = NULL;
+ int irq = platform_get_irq(pdev, 0);
+ int gpio_irq_base = GPIO_IRQ_BASE + pdev->id * 32;
BUG_ON(pdev->id >= MAX_NR_PIO_DEVICES);
pio = &pio_dev[pdev->id];
BUG_ON(!pio->regs);
- /* TODO: Interrupts */
+ gpio_irq_setup(pio, irq, gpio_irq_base);
platform_set_drvdata(pdev, pio);
- printk(KERN_INFO "%s: Atmel Port Multiplexer at 0x%p (irq %d)\n",
- pio->name, pio->regs, platform_get_irq(pdev, 0));
+ printk(KERN_DEBUG "%s: base 0x%p, irq %d chains %d..%d\n",
+ pio->name, pio->regs, irq, gpio_irq_base, gpio_irq_base + 31);
return 0;
}
@@ -148,7 +343,7 @@ static int __init pio_init(void)
{
return platform_driver_register(&pio_driver);
}
-subsys_initcall(pio_init);
+postcore_initcall(pio_init);
void __init at32_init_pio(struct platform_device *pdev)
{
@@ -184,6 +379,16 @@ void __init at32_init_pio(struct platform_device *pdev)
pio->pdev = pdev;
pio->regs = ioremap(regs->start, regs->end - regs->start + 1);
+ /*
+ * request_gpio() is only valid for pins that have been
+ * explicitly configured as GPIO and not previously requested
+ */
+ pio->gpio_mask = ~0UL;
+
pio_writel(pio, ODR, ~0UL);
pio_writel(pio, PER, ~0UL);
+
+ /* start with irqs disabled and acked */
+ pio_writel(pio, IDR, ~0UL);
+ (void) pio_readl(pio, ISR);
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-20 01:26:16 +0000