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-rw-r--r--arch/arm/mach-sa1100/irq.c332
1 files changed, 332 insertions, 0 deletions
diff --git a/arch/arm/mach-sa1100/irq.c b/arch/arm/mach-sa1100/irq.c
new file mode 100644
index 000000000000..66a929cb7bc5
--- /dev/null
+++ b/arch/arm/mach-sa1100/irq.c
@@ -0,0 +1,332 @@
+/*
+ * linux/arch/arm/mach-sa1100/irq.c
+ *
+ * Copyright (C) 1999-2001 Nicolas Pitre
+ *
+ * Generic IRQ handling for the SA11x0, GPIO 11-27 IRQ demultiplexing.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/ptrace.h>
+#include <linux/sysdev.h>
+
+#include <asm/hardware.h>
+#include <asm/irq.h>
+#include <asm/mach/irq.h>
+
+#include "generic.h"
+
+
+/*
+ * SA1100 GPIO edge detection for IRQs:
+ * IRQs are generated on Falling-Edge, Rising-Edge, or both.
+ * Use this instead of directly setting GRER/GFER.
+ */
+static int GPIO_IRQ_rising_edge;
+static int GPIO_IRQ_falling_edge;
+static int GPIO_IRQ_mask = (1 << 11) - 1;
+
+/*
+ * To get the GPIO number from an IRQ number
+ */
+#define GPIO_11_27_IRQ(i) ((i) - 21)
+#define GPIO11_27_MASK(irq) (1 << GPIO_11_27_IRQ(irq))
+
+static int sa1100_gpio_type(unsigned int irq, unsigned int type)
+{
+ unsigned int mask;
+
+ if (irq <= 10)
+ mask = 1 << irq;
+ else
+ mask = GPIO11_27_MASK(irq);
+
+ if (type == IRQT_PROBE) {
+ if ((GPIO_IRQ_rising_edge | GPIO_IRQ_falling_edge) & mask)
+ return 0;
+ type = __IRQT_RISEDGE | __IRQT_FALEDGE;
+ }
+
+ if (type & __IRQT_RISEDGE) {
+ GPIO_IRQ_rising_edge |= mask;
+ } else
+ GPIO_IRQ_rising_edge &= ~mask;
+ if (type & __IRQT_FALEDGE) {
+ GPIO_IRQ_falling_edge |= mask;
+ } else
+ GPIO_IRQ_falling_edge &= ~mask;
+
+ GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
+ GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
+
+ return 0;
+}
+
+/*
+ * GPIO IRQs must be acknowledged. This is for IRQs from 0 to 10.
+ */
+static void sa1100_low_gpio_ack(unsigned int irq)
+{
+ GEDR = (1 << irq);
+}
+
+static void sa1100_low_gpio_mask(unsigned int irq)
+{
+ ICMR &= ~(1 << irq);
+}
+
+static void sa1100_low_gpio_unmask(unsigned int irq)
+{
+ ICMR |= 1 << irq;
+}
+
+static int sa1100_low_gpio_wake(unsigned int irq, unsigned int on)
+{
+ if (on)
+ PWER |= 1 << irq;
+ else
+ PWER &= ~(1 << irq);
+ return 0;
+}
+
+static struct irqchip sa1100_low_gpio_chip = {
+ .ack = sa1100_low_gpio_ack,
+ .mask = sa1100_low_gpio_mask,
+ .unmask = sa1100_low_gpio_unmask,
+ .type = sa1100_gpio_type,
+ .wake = sa1100_low_gpio_wake,
+};
+
+/*
+ * IRQ11 (GPIO11 through 27) handler. We enter here with the
+ * irq_controller_lock held, and IRQs disabled. Decode the IRQ
+ * and call the handler.
+ */
+static void
+sa1100_high_gpio_handler(unsigned int irq, struct irqdesc *desc,
+ struct pt_regs *regs)
+{
+ unsigned int mask;
+
+ mask = GEDR & 0xfffff800;
+ do {
+ /*
+ * clear down all currently active IRQ sources.
+ * We will be processing them all.
+ */
+ GEDR = mask;
+
+ irq = IRQ_GPIO11;
+ desc = irq_desc + irq;
+ mask >>= 11;
+ do {
+ if (mask & 1)
+ desc->handle(irq, desc, regs);
+ mask >>= 1;
+ irq++;
+ desc++;
+ } while (mask);
+
+ mask = GEDR & 0xfffff800;
+ } while (mask);
+}
+
+/*
+ * Like GPIO0 to 10, GPIO11-27 IRQs need to be handled specially.
+ * In addition, the IRQs are all collected up into one bit in the
+ * interrupt controller registers.
+ */
+static void sa1100_high_gpio_ack(unsigned int irq)
+{
+ unsigned int mask = GPIO11_27_MASK(irq);
+
+ GEDR = mask;
+}
+
+static void sa1100_high_gpio_mask(unsigned int irq)
+{
+ unsigned int mask = GPIO11_27_MASK(irq);
+
+ GPIO_IRQ_mask &= ~mask;
+
+ GRER &= ~mask;
+ GFER &= ~mask;
+}
+
+static void sa1100_high_gpio_unmask(unsigned int irq)
+{
+ unsigned int mask = GPIO11_27_MASK(irq);
+
+ GPIO_IRQ_mask |= mask;
+
+ GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
+ GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
+}
+
+static int sa1100_high_gpio_wake(unsigned int irq, unsigned int on)
+{
+ if (on)
+ PWER |= GPIO11_27_MASK(irq);
+ else
+ PWER &= ~GPIO11_27_MASK(irq);
+ return 0;
+}
+
+static struct irqchip sa1100_high_gpio_chip = {
+ .ack = sa1100_high_gpio_ack,
+ .mask = sa1100_high_gpio_mask,
+ .unmask = sa1100_high_gpio_unmask,
+ .type = sa1100_gpio_type,
+ .wake = sa1100_high_gpio_wake,
+};
+
+/*
+ * We don't need to ACK IRQs on the SA1100 unless they're GPIOs
+ * this is for internal IRQs i.e. from 11 to 31.
+ */
+static void sa1100_mask_irq(unsigned int irq)
+{
+ ICMR &= ~(1 << irq);
+}
+
+static void sa1100_unmask_irq(unsigned int irq)
+{
+ ICMR |= (1 << irq);
+}
+
+static struct irqchip sa1100_normal_chip = {
+ .ack = sa1100_mask_irq,
+ .mask = sa1100_mask_irq,
+ .unmask = sa1100_unmask_irq,
+};
+
+static struct resource irq_resource = {
+ .name = "irqs",
+ .start = 0x90050000,
+ .end = 0x9005ffff,
+};
+
+static struct sa1100irq_state {
+ unsigned int saved;
+ unsigned int icmr;
+ unsigned int iclr;
+ unsigned int iccr;
+} sa1100irq_state;
+
+static int sa1100irq_suspend(struct sys_device *dev, pm_message_t state)
+{
+ struct sa1100irq_state *st = &sa1100irq_state;
+
+ st->saved = 1;
+ st->icmr = ICMR;
+ st->iclr = ICLR;
+ st->iccr = ICCR;
+
+ /*
+ * Disable all GPIO-based interrupts.
+ */
+ ICMR &= ~(IC_GPIO11_27|IC_GPIO10|IC_GPIO9|IC_GPIO8|IC_GPIO7|
+ IC_GPIO6|IC_GPIO5|IC_GPIO4|IC_GPIO3|IC_GPIO2|
+ IC_GPIO1|IC_GPIO0);
+
+ /*
+ * Set the appropriate edges for wakeup.
+ */
+ GRER = PWER & GPIO_IRQ_rising_edge;
+ GFER = PWER & GPIO_IRQ_falling_edge;
+
+ /*
+ * Clear any pending GPIO interrupts.
+ */
+ GEDR = GEDR;
+
+ return 0;
+}
+
+static int sa1100irq_resume(struct sys_device *dev)
+{
+ struct sa1100irq_state *st = &sa1100irq_state;
+
+ if (st->saved) {
+ ICCR = st->iccr;
+ ICLR = st->iclr;
+
+ GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
+ GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
+
+ ICMR = st->icmr;
+ }
+ return 0;
+}
+
+static struct sysdev_class sa1100irq_sysclass = {
+ set_kset_name("sa11x0-irq"),
+ .suspend = sa1100irq_suspend,
+ .resume = sa1100irq_resume,
+};
+
+static struct sys_device sa1100irq_device = {
+ .id = 0,
+ .cls = &sa1100irq_sysclass,
+};
+
+static int __init sa1100irq_init_devicefs(void)
+{
+ sysdev_class_register(&sa1100irq_sysclass);
+ return sysdev_register(&sa1100irq_device);
+}
+
+device_initcall(sa1100irq_init_devicefs);
+
+void __init sa1100_init_irq(void)
+{
+ unsigned int irq;
+
+ request_resource(&iomem_resource, &irq_resource);
+
+ /* disable all IRQs */
+ ICMR = 0;
+
+ /* all IRQs are IRQ, not FIQ */
+ ICLR = 0;
+
+ /* clear all GPIO edge detects */
+ GFER = 0;
+ GRER = 0;
+ GEDR = -1;
+
+ /*
+ * Whatever the doc says, this has to be set for the wait-on-irq
+ * instruction to work... on a SA1100 rev 9 at least.
+ */
+ ICCR = 1;
+
+ for (irq = 0; irq <= 10; irq++) {
+ set_irq_chip(irq, &sa1100_low_gpio_chip);
+ set_irq_handler(irq, do_edge_IRQ);
+ set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+ }
+
+ for (irq = 12; irq <= 31; irq++) {
+ set_irq_chip(irq, &sa1100_normal_chip);
+ set_irq_handler(irq, do_level_IRQ);
+ set_irq_flags(irq, IRQF_VALID);
+ }
+
+ for (irq = 32; irq <= 48; irq++) {
+ set_irq_chip(irq, &sa1100_high_gpio_chip);
+ set_irq_handler(irq, do_edge_IRQ);
+ set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+ }
+
+ /*
+ * Install handler for GPIO 11-27 edge detect interrupts
+ */
+ set_irq_chip(IRQ_GPIO11_27, &sa1100_normal_chip);
+ set_irq_chained_handler(IRQ_GPIO11_27, sa1100_high_gpio_handler);
+}