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Diffstat (limited to 'arch/arm/mach-mv78xx0/irq.c')
-rw-r--r--arch/arm/mach-mv78xx0/irq.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/arch/arm/mach-mv78xx0/irq.c b/arch/arm/mach-mv78xx0/irq.c
new file mode 100644
index 000000000..a34b6855f
--- /dev/null
+++ b/arch/arm/mach-mv78xx0/irq.c
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * arch/arm/mach-mv78xx0/irq.c
+ *
+ * MV78xx0 IRQ handling.
+ */
+#include <linux/gpio.h>
+#include <linux/kernel.h>
+#include <linux/irq.h>
+#include <linux/io.h>
+#include <asm/exception.h>
+#include <plat/orion-gpio.h>
+#include <plat/irq.h>
+#include "bridge-regs.h"
+#include "common.h"
+
+static int __initdata gpio0_irqs[4] = {
+ IRQ_MV78XX0_GPIO_0_7,
+ IRQ_MV78XX0_GPIO_8_15,
+ IRQ_MV78XX0_GPIO_16_23,
+ IRQ_MV78XX0_GPIO_24_31,
+};
+
+static void __iomem *mv78xx0_irq_base = IRQ_VIRT_BASE;
+
+static asmlinkage void
+__exception_irq_entry mv78xx0_legacy_handle_irq(struct pt_regs *regs)
+{
+ u32 stat;
+
+ stat = readl_relaxed(mv78xx0_irq_base + IRQ_CAUSE_LOW_OFF);
+ stat &= readl_relaxed(mv78xx0_irq_base + IRQ_MASK_LOW_OFF);
+ if (stat) {
+ unsigned int hwirq = __fls(stat);
+ handle_IRQ(hwirq, regs);
+ return;
+ }
+ stat = readl_relaxed(mv78xx0_irq_base + IRQ_CAUSE_HIGH_OFF);
+ stat &= readl_relaxed(mv78xx0_irq_base + IRQ_MASK_HIGH_OFF);
+ if (stat) {
+ unsigned int hwirq = 32 + __fls(stat);
+ handle_IRQ(hwirq, regs);
+ return;
+ }
+ stat = readl_relaxed(mv78xx0_irq_base + IRQ_CAUSE_ERR_OFF);
+ stat &= readl_relaxed(mv78xx0_irq_base + IRQ_MASK_ERR_OFF);
+ if (stat) {
+ unsigned int hwirq = 64 + __fls(stat);
+ handle_IRQ(hwirq, regs);
+ return;
+ }
+}
+
+void __init mv78xx0_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);
+ orion_irq_init(64, IRQ_VIRT_BASE + IRQ_MASK_ERR_OFF);
+
+ set_handle_irq(mv78xx0_legacy_handle_irq);
+
+ /*
+ * Initialize gpiolib for GPIOs 0-31. (The GPIO interrupt mask
+ * registers for core #1 are at an offset of 0x18 from those of
+ * core #0.)
+ */
+ orion_gpio_init(0, 32, GPIO_VIRT_BASE, mv78xx0_core_index() ? 0x18 : 0,
+ IRQ_MV78XX0_GPIO_START, gpio0_irqs);
+}