1 files changed, 199 insertions, 0 deletions

diff --git a/arch/mips/ddb5xxx/ddb5477/irq.c b/arch/mips/ddb5xxx/ddb5477/irq.c
new file mode 100644
index 000000000000..5f027bfa4af8
--- /dev/null
+++ b/arch/mips/ddb5xxx/ddb5477/irq.c
@@ -0,0 +1,199 @@
+/*
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: Jun Sun, jsun@mvista.com or jsun@junsun.net
+ *
+ *  arch/mips/ddb5xxx/ddb5477/irq.c
+ *     The irq setup and misc routines for DDB5476.
+ *
+ * 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/config.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/types.h>
+#include <linux/ptrace.h>
+
+#include <asm/i8259.h>
+#include <asm/system.h>
+#include <asm/mipsregs.h>
+#include <asm/debug.h>
+#include <asm/addrspace.h>
+#include <asm/bootinfo.h>
+
+#include <asm/ddb5xxx/ddb5xxx.h>
+
+
+/*
+ * IRQ mapping
+ *
+ *  0-7: 8 CPU interrupts
+ *      0 -     software interrupt 0
+ *      1 -     software interrupt 1
+ *      2 -     most Vrc5477 interrupts are routed to this pin
+ *      3 -     (optional) some other interrupts routed to this pin for debugg
+ *      4 -     not used
+ *      5 -     not used
+ *      6 -     not used
+ *      7 -     cpu timer (used by default)
+ *
+ *  8-39: 32 Vrc5477 interrupt sources
+ *      (refer to the Vrc5477 manual)
+ */
+
+#define PCI0                    DDB_INTPPES0
+#define PCI1                    DDB_INTPPES1
+
+#define ACTIVE_LOW              1
+#define ACTIVE_HIGH             0
+
+#define LEVEL_SENSE             2
+#define EDGE_TRIGGER            0
+
+#define INTA                    0
+#define INTB                    1
+#define INTC                    2
+#define INTD                    3
+#define INTE                    4
+
+static inline void
+set_pci_int_attr(u32 pci, u32 intn, u32 active, u32 trigger)
+{
+        u32 reg_value;
+        u32 reg_bitmask;
+
+        reg_value = ddb_in32(pci);
+        reg_bitmask = 0x3 << (intn * 2);
+
+        reg_value &= ~reg_bitmask;
+        reg_value |= (active | trigger) << (intn * 2);
+        ddb_out32(pci, reg_value);
+}
+
+extern void vrc5477_irq_init(u32 base);
+extern void mips_cpu_irq_init(u32 base);
+extern asmlinkage void ddb5477_handle_int(void);
+extern int setup_irq(unsigned int irq, struct irqaction *irqaction);  
+static struct irqaction irq_cascade = { no_action, 0, CPU_MASK_NONE, "cascade", NULL, NULL };
+
+void __init arch_init_irq(void)
+{
+        /* by default, we disable all interrupts and route all vrc5477
+         * interrupts to pin 0 (irq 2) */
+        ddb_out32(DDB_INTCTRL0, 0);
+        ddb_out32(DDB_INTCTRL1, 0);
+        ddb_out32(DDB_INTCTRL2, 0);
+        ddb_out32(DDB_INTCTRL3, 0);
+
+        clear_c0_status(0xff00);
+        set_c0_status(0x0400);
+
+        /* setup PCI interrupt attributes */
+        set_pci_int_attr(PCI0, INTA, ACTIVE_LOW, LEVEL_SENSE);
+        set_pci_int_attr(PCI0, INTB, ACTIVE_LOW, LEVEL_SENSE);
+        if (mips_machtype == MACH_NEC_ROCKHOPPERII) 
+                set_pci_int_attr(PCI0, INTC, ACTIVE_HIGH, LEVEL_SENSE);
+        else
+                set_pci_int_attr(PCI0, INTC, ACTIVE_LOW, LEVEL_SENSE);
+        set_pci_int_attr(PCI0, INTD, ACTIVE_LOW, LEVEL_SENSE);
+        set_pci_int_attr(PCI0, INTE, ACTIVE_LOW, LEVEL_SENSE);
+
+        set_pci_int_attr(PCI1, INTA, ACTIVE_LOW, LEVEL_SENSE);
+        set_pci_int_attr(PCI1, INTB, ACTIVE_LOW, LEVEL_SENSE);
+        set_pci_int_attr(PCI1, INTC, ACTIVE_LOW, LEVEL_SENSE);
+        set_pci_int_attr(PCI1, INTD, ACTIVE_LOW, LEVEL_SENSE);
+        set_pci_int_attr(PCI1, INTE, ACTIVE_LOW, LEVEL_SENSE);
+
+        /*
+         * for debugging purpose, we enable several error interrupts
+         * and route them to pin 1. (IP3)
+         */
+        /* cpu parity check - 0 */
+        ll_vrc5477_irq_route(0, 1); ll_vrc5477_irq_enable(0);
+        /* cpu no-target decode - 1 */
+        ll_vrc5477_irq_route(1, 1); ll_vrc5477_irq_enable(1);
+        /* local bus read time-out - 7 */
+        ll_vrc5477_irq_route(7, 1); ll_vrc5477_irq_enable(7);
+        /* PCI SERR# - 14 */
+        ll_vrc5477_irq_route(14, 1); ll_vrc5477_irq_enable(14);
+        /* PCI internal error - 15 */
+        ll_vrc5477_irq_route(15, 1); ll_vrc5477_irq_enable(15);
+        /* IOPCI SERR# - 30 */
+        ll_vrc5477_irq_route(30, 1); ll_vrc5477_irq_enable(30);
+        /* IOPCI internal error - 31 */
+        ll_vrc5477_irq_route(31, 1); ll_vrc5477_irq_enable(31);
+
+        /* init all controllers */
+        init_i8259_irqs();
+        mips_cpu_irq_init(CPU_IRQ_BASE);
+        vrc5477_irq_init(VRC5477_IRQ_BASE);
+
+
+        /* setup cascade interrupts */
+        setup_irq(VRC5477_IRQ_BASE + VRC5477_I8259_CASCADE, &irq_cascade);
+        setup_irq(CPU_IRQ_BASE + CPU_VRC5477_CASCADE, &irq_cascade);      
+
+        /* hook up the first-level interrupt handler */
+        set_except_vector(0, ddb5477_handle_int);
+}
+
+u8 i8259_interrupt_ack(void)
+{
+        u8 irq;
+        u32 reg;
+
+        /* Set window 0 for interrupt acknowledge */
+        reg = ddb_in32(DDB_PCIINIT10);
+
+        ddb_set_pmr(DDB_PCIINIT10, DDB_PCICMD_IACK, 0, DDB_PCI_ACCESS_32);
+        irq = *(volatile u8 *) KSEG1ADDR(DDB_PCI_IACK_BASE);
+        ddb_out32(DDB_PCIINIT10, reg);
+
+        /* i8259.c set the base vector to be 0x0 */
+        return irq + I8259_IRQ_BASE;
+}
+/*
+ * the first level int-handler will jump here if it is a vrc5477 irq
+ */
+#define NUM_5477_IRQS   32
+asmlinkage void
+vrc5477_irq_dispatch(struct pt_regs *regs)
+{
+        u32 intStatus;
+        u32 bitmask;
+        u32 i;
+
+        db_assert(ddb_in32(DDB_INT2STAT) == 0);
+        db_assert(ddb_in32(DDB_INT3STAT) == 0);
+        db_assert(ddb_in32(DDB_INT4STAT) == 0);
+        db_assert(ddb_in32(DDB_NMISTAT) == 0);
+
+        if (ddb_in32(DDB_INT1STAT) != 0) {
+#if defined(CONFIG_RUNTIME_DEBUG)
+                vrc5477_show_int_regs();
+#endif
+                panic("error interrupt has happened.");
+        }
+
+        intStatus = ddb_in32(DDB_INT0STAT);
+
+        if (mips_machtype == MACH_NEC_ROCKHOPPERII) {
+                /* check for i8259 interrupts */
+                if (intStatus & (1 << VRC5477_I8259_CASCADE)) {
+                        int i8259_irq = i8259_interrupt_ack();
+                        do_IRQ(I8259_IRQ_BASE + i8259_irq, regs);
+                        return;
+                }
+        }
+
+        for (i=0, bitmask=1; i<= NUM_5477_IRQS; bitmask <<=1, i++) {
+                /* do we need to "and" with the int mask? */
+                if (intStatus & bitmask) {
+                        do_IRQ(VRC5477_IRQ_BASE + i, regs);
+                        return;
+                }
+        }
+}