1 files changed, 82 insertions, 0 deletions
diff --git a/arch/arm/mach-kirkwood/irq.c b/arch/arm/mach-kirkwood/irq.c
new file mode 100644
index 00000000000..2c47a8ad0e2
--- /dev/null
+++ b/arch/arm/mach-kirkwood/irq.c
@@ -0,0 +1,82 @@
+/*
+ * arch/arm/mach-kirkwood/irq.c
+ *
+ * Kirkwood IRQ handling.
+ *
+ * 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 <asm/exception.h>
+#include <linux/gpio.h>
+#include <linux/kernel.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <mach/bridge-regs.h>
+#include <plat/orion-gpio.h>
+#include <plat/irq.h>
+#include "common.h"
+
+static int __initdata gpio0_irqs[4] = {
+	IRQ_KIRKWOOD_GPIO_LOW_0_7,
+	IRQ_KIRKWOOD_GPIO_LOW_8_15,
+	IRQ_KIRKWOOD_GPIO_LOW_16_23,
+	IRQ_KIRKWOOD_GPIO_LOW_24_31,
+};
+
+static int __initdata gpio1_irqs[4] = {
+	IRQ_KIRKWOOD_GPIO_HIGH_0_7,
+	IRQ_KIRKWOOD_GPIO_HIGH_8_15,
+	IRQ_KIRKWOOD_GPIO_HIGH_16_23,
+	0,
+};
+
+#ifdef CONFIG_MULTI_IRQ_HANDLER
+/*
+ * Compiling with both non-DT and DT support enabled, will
+ * break asm irq handler used by non-DT boards. Therefore,
+ * we provide a C-style irq handler even for non-DT boards,
+ * if MULTI_IRQ_HANDLER is set.
+ */
+
+static void __iomem *kirkwood_irq_base = IRQ_VIRT_BASE;
+
+asmlinkage void
+__exception_irq_entry kirkwood_legacy_handle_irq(struct pt_regs *regs)
+{
+	u32 stat;
+
+	stat = readl_relaxed(kirkwood_irq_base + IRQ_CAUSE_LOW_OFF);
+	stat &= readl_relaxed(kirkwood_irq_base + IRQ_MASK_LOW_OFF);
+	if (stat) {
+		unsigned int hwirq = __fls(stat);
+		handle_IRQ(hwirq, regs);
+		return;
+	}
+	stat = readl_relaxed(kirkwood_irq_base + IRQ_CAUSE_HIGH_OFF);
+	stat &= readl_relaxed(kirkwood_irq_base + IRQ_MASK_HIGH_OFF);
+	if (stat) {
+		unsigned int hwirq = 32 + __fls(stat);
+		handle_IRQ(hwirq, regs);
+		return;
+	}
+}
+#endif
+
+void __init kirkwood_init_irq(void)
+{
+	orion_irq_init(0, IRQ_VIRT_BASE + IRQ_MASK_LOW_OFF);
+	orion_irq_init(32, IRQ_VIRT_BASE + IRQ_MASK_HIGH_OFF);
+
+#ifdef CONFIG_MULTI_IRQ_HANDLER
+	set_handle_irq(kirkwood_legacy_handle_irq);
+#endif
+
+	/*
+	 * Initialize gpiolib for GPIOs 0-49.
+	 */
+	orion_gpio_init(NULL, 0, 32, GPIO_LOW_VIRT_BASE, 0,
+			IRQ_KIRKWOOD_GPIO_START, gpio0_irqs);
+	orion_gpio_init(NULL, 32, 18, GPIO_HIGH_VIRT_BASE, 0,
+			IRQ_KIRKWOOD_GPIO_START + 32, gpio1_irqs);
+}