[ARM] Orion: IRQ support
Signed-off-by: Tzachi Perelstein <tzachi@marvell.com>
Reviewed-by: Nicolas Pitre <nico@marvell.com>
Reviewed-by: Lennert Buytenhek <buytenh@marvell.com>
Acked-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/mach-orion/irq.c b/arch/arm/mach-orion/irq.c
new file mode 100644
index 0000000..585a0fb
--- /dev/null
+++ b/arch/arm/mach-orion/irq.c
@@ -0,0 +1,160 @@
+/*
+ * arch/arm/mach-orion/irq.c
+ *
+ * Core IRQ functions for Marvell Orion System On Chip
+ *
+ * Maintainer: Tzachi Perelstein <tzachi@marvell.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/irq.h>
+#include <asm/gpio.h>
+#include <asm/arch/orion.h>
+#include "common.h"
+
+/*****************************************************************************
+ * Orion GPIO IRQ
+ ****************************************************************************/
+static void orion_gpio_irq_mask(u32 irq)
+{
+ int pin = irq_to_gpio(irq);
+ orion_clrbits(GPIO_LEVEL_MASK, 1 << pin);
+}
+
+static void orion_gpio_irq_unmask(u32 irq)
+{
+ int pin = irq_to_gpio(irq);
+ orion_setbits(GPIO_LEVEL_MASK, 1 << pin);
+}
+
+static int orion_gpio_set_irq_type(u32 irq, u32 type)
+{
+ int pin = irq_to_gpio(irq);
+
+ if ((orion_read(GPIO_IO_CONF) & (1 << pin)) == 0) {
+ printk(KERN_ERR "orion_gpio_set_irq_type failed "
+ "(irq %d, pin %d).\n", irq, pin);
+ return -EINVAL;
+ }
+
+ switch (type) {
+ case IRQT_HIGH:
+ orion_clrbits(GPIO_IN_POL, (1 << pin));
+ break;
+ case IRQT_LOW:
+ orion_setbits(GPIO_IN_POL, (1 << pin));
+ break;
+ default:
+ printk(KERN_ERR "failed to set irq=%d (type=%d)\n", irq, type);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static struct irq_chip orion_gpio_irq_chip = {
+ .name = "Orion-IRQ-GPIO",
+ .ack = orion_gpio_irq_mask,
+ .mask = orion_gpio_irq_mask,
+ .unmask = orion_gpio_irq_unmask,
+ .set_type = orion_gpio_set_irq_type,
+};
+
+static void orion_gpio_irq_handler(unsigned int irq, struct irq_desc *desc)
+{
+ int i;
+ u32 cause, shift;
+
+ BUG_ON(irq < IRQ_ORION_GPIO_0_7 || irq > IRQ_ORION_GPIO_24_31);
+ shift = (irq - IRQ_ORION_GPIO_0_7) * 8;
+ cause = orion_read(GPIO_EDGE_CAUSE) & orion_read(GPIO_LEVEL_MASK);
+ cause &= (0xff << shift);
+
+ for (i = shift; i < shift + 8; i++) {
+ if (cause & (1 << i)) {
+ int gpio_irq = i + IRQ_ORION_GPIO_START;
+ if (gpio_irq > 0) {
+ desc = irq_desc + gpio_irq;
+ desc_handle_irq(gpio_irq, desc);
+ } else {
+ printk(KERN_ERR "orion_gpio_irq_handler error, "
+ "invalid irq %d\n", gpio_irq);
+ }
+ }
+ }
+}
+
+static void __init orion_init_gpio_irq(void)
+{
+ int i;
+
+ /*
+ * Mask and clear GPIO IRQ interrupts
+ */
+ orion_write(GPIO_LEVEL_MASK, 0x0);
+ orion_write(GPIO_EDGE_CAUSE, 0x0);
+
+ /*
+ * Register chained level handlers for GPIO IRQs
+ */
+ for (i = IRQ_ORION_GPIO_START; i < NR_IRQS; i++) {
+ set_irq_chip(i, &orion_gpio_irq_chip);
+ set_irq_handler(i, handle_level_irq);
+ set_irq_flags(i, IRQF_VALID);
+ }
+ set_irq_chained_handler(IRQ_ORION_GPIO_0_7, orion_gpio_irq_handler);
+ set_irq_chained_handler(IRQ_ORION_GPIO_8_15, orion_gpio_irq_handler);
+ set_irq_chained_handler(IRQ_ORION_GPIO_16_23, orion_gpio_irq_handler);
+ set_irq_chained_handler(IRQ_ORION_GPIO_24_31, orion_gpio_irq_handler);
+}
+
+/*****************************************************************************
+ * Orion Main IRQ
+ ****************************************************************************/
+static void orion_main_irq_mask(u32 irq)
+{
+ orion_clrbits(MAIN_IRQ_MASK, 1 << irq);
+}
+
+static void orion_main_irq_unmask(u32 irq)
+{
+ orion_setbits(MAIN_IRQ_MASK, 1 << irq);
+}
+
+static struct irq_chip orion_main_irq_chip = {
+ .name = "Orion-IRQ-Main",
+ .ack = orion_main_irq_mask,
+ .mask = orion_main_irq_mask,
+ .unmask = orion_main_irq_unmask,
+};
+
+static void __init orion_init_main_irq(void)
+{
+ int i;
+
+ /*
+ * Mask and clear Main IRQ interrupts
+ */
+ orion_write(MAIN_IRQ_MASK, 0x0);
+ orion_write(MAIN_IRQ_CAUSE, 0x0);
+
+ /*
+ * Register level handler for Main IRQs
+ */
+ for (i = 0; i < IRQ_ORION_GPIO_START; i++) {
+ set_irq_chip(i, &orion_main_irq_chip);
+ set_irq_handler(i, handle_level_irq);
+ set_irq_flags(i, IRQF_VALID);
+ }
+}
+
+void __init orion_init_irq(void)
+{
+ orion_init_main_irq();
+ orion_init_gpio_irq();
+}