Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / mach-orion5x / irq.c

diff --git a/kernel/arch/arm/mach-orion5x/irq.c b/kernel/arch/arm/mach-orion5x/irq.c
new file mode 100644 (file)
index 0000000..cd4bac4
--- /dev/null
+++ b/kernel/arch/arm/mach-orion5x/irq.c
@@ -0,0 +1,65 @@
+/*
+ * arch/arm/mach-orion5x/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/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 <asm/exception.h>
+#include "common.h"
+
+static int __initdata gpio0_irqs[4] = {
+       IRQ_ORION5X_GPIO_0_7,
+       IRQ_ORION5X_GPIO_8_15,
+       IRQ_ORION5X_GPIO_16_23,
+       IRQ_ORION5X_GPIO_24_31,
+};
+
+#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.
+ */
+
+asmlinkage void
+__exception_irq_entry orion5x_legacy_handle_irq(struct pt_regs *regs)
+{
+       u32 stat;
+
+       stat = readl_relaxed(MAIN_IRQ_CAUSE);
+       stat &= readl_relaxed(MAIN_IRQ_MASK);
+       if (stat) {
+               unsigned int hwirq = __fls(stat);
+               handle_IRQ(hwirq, regs);
+               return;
+       }
+}
+#endif
+
+void __init orion5x_init_irq(void)
+{
+       orion_irq_init(0, MAIN_IRQ_MASK);
+
+#ifdef CONFIG_MULTI_IRQ_HANDLER
+       set_handle_irq(orion5x_legacy_handle_irq);
+#endif
+
+       /*
+        * Initialize gpiolib for GPIOs 0-31.
+        */
+       orion_gpio_init(NULL, 0, 32, GPIO_VIRT_BASE, 0,
+                       IRQ_ORION5X_GPIO_START, gpio0_irqs);
+}