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Diffstat (limited to 'arch/mips/loongson/fuloong-2e/irq.c')
-rw-r--r--arch/mips/loongson/fuloong-2e/irq.c111
1 files changed, 111 insertions, 0 deletions
diff --git a/arch/mips/loongson/fuloong-2e/irq.c b/arch/mips/loongson/fuloong-2e/irq.c
new file mode 100644
index 0000000..9585f5a
--- /dev/null
+++ b/arch/mips/loongson/fuloong-2e/irq.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2007 Lemote Inc. & Insititute of Computing Technology
+ * Author: Fuxin Zhang, zhangfx@lemote.com
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+
+#include <asm/irq_cpu.h>
+#include <asm/i8259.h>
+
+#include <loongson.h>
+/*
+ * the first level int-handler will jump here if it is a bonito irq
+ */
+static void bonito_irqdispatch(void)
+{
+ u32 int_status;
+ int i;
+
+ /* workaround the IO dma problem: let cpu looping to allow DMA finish */
+ int_status = BONITO_INTISR;
+ if (int_status & (1 << 10)) {
+ while (int_status & (1 << 10)) {
+ udelay(1);
+ int_status = BONITO_INTISR;
+ }
+ }
+
+ /* Get pending sources, masked by current enables */
+ int_status = BONITO_INTISR & BONITO_INTEN;
+
+ if (int_status != 0) {
+ i = __ffs(int_status);
+ int_status &= ~(1 << i);
+ do_IRQ(BONITO_IRQ_BASE + i);
+ }
+}
+
+static void i8259_irqdispatch(void)
+{
+ int irq;
+
+ irq = i8259_irq();
+ if (irq >= 0)
+ do_IRQ(irq);
+ else
+ spurious_interrupt();
+}
+
+asmlinkage void plat_irq_dispatch(void)
+{
+ unsigned int pending = read_c0_cause() & read_c0_status() & ST0_IM;
+
+ if (pending & CAUSEF_IP7)
+ do_IRQ(MIPS_CPU_IRQ_BASE + 7);
+ else if (pending & CAUSEF_IP6) /* perf counter loverflow */
+ do_IRQ(LOONGSON2_PERFCNT_IRQ);
+ else if (pending & CAUSEF_IP5)
+ i8259_irqdispatch();
+ else if (pending & CAUSEF_IP2)
+ bonito_irqdispatch();
+ else
+ spurious_interrupt();
+}
+
+static struct irqaction cascade_irqaction = {
+ .handler = no_action,
+ .name = "cascade",
+};
+
+void __init arch_init_irq(void)
+{
+ /*
+ * Clear all of the interrupts while we change the able around a bit.
+ * int-handler is not on bootstrap
+ */
+ clear_c0_status(ST0_IM | ST0_BEV);
+ local_irq_disable();
+
+ /* most bonito irq should be level triggered */
+ BONITO_INTEDGE = BONITO_ICU_SYSTEMERR | BONITO_ICU_MASTERERR |
+ BONITO_ICU_RETRYERR | BONITO_ICU_MBOXES;
+ BONITO_INTSTEER = 0;
+
+ /*
+ * Mask out all interrupt by writing "1" to all bit position in
+ * the interrupt reset reg.
+ */
+ BONITO_INTENCLR = ~0;
+
+ /* init all controller
+ * 0-15 ------> i8259 interrupt
+ * 16-23 ------> mips cpu interrupt
+ * 32-63 ------> bonito irq
+ */
+
+ /* Sets the first-level interrupt dispatcher. */
+ mips_cpu_irq_init();
+ init_i8259_irqs();
+ bonito_irq_init();
+
+ /* bonito irq at IP2 */
+ setup_irq(MIPS_CPU_IRQ_BASE + 2, &cascade_irqaction);
+ /* 8259 irq at IP5 */
+ setup_irq(MIPS_CPU_IRQ_BASE + 5, &cascade_irqaction);
+}
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