2 * arch/mips/emma2rh/markeins/irq.c
3 * This file defines the irq handler for EMMA2RH.
5 * Copyright (C) NEC Electronics Corporation 2004-2006
7 * This file is based on the arch/mips/ddb5xxx/ddb5477/irq.c
9 * Copyright 2001 MontaVista Software Inc.
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
25 #include <linux/init.h>
26 #include <linux/interrupt.h>
27 #include <linux/irq.h>
28 #include <linux/types.h>
29 #include <linux/ptrace.h>
30 #include <linux/delay.h>
32 #include <asm/i8259.h>
33 #include <asm/irq_cpu.h>
34 #include <asm/system.h>
35 #include <asm/mipsregs.h>
36 #include <asm/debug.h>
37 #include <asm/addrspace.h>
38 #include <asm/bootinfo.h>
40 #include <asm/emma2rh/emma2rh.h>
45 * 0-7: 8 CPU interrupts
46 * 0 - software interrupt 0
47 * 1 - software interrupt 1
48 * 2 - most Vrc5477 interrupts are routed to this pin
49 * 3 - (optional) some other interrupts routed to this pin for debugg
53 * 7 - cpu timer (used by default)
57 extern void emma2rh_sw_irq_init(u32 base);
58 extern void emma2rh_gpio_irq_init(u32 base);
59 extern void emma2rh_irq_init(u32 base);
60 extern asmlinkage void emma2rh_irq_dispatch(struct pt_regs *regs);
62 static struct irqaction irq_cascade = {
65 .mask = CPU_MASK_NONE,
71 void __init arch_init_irq(void)
75 db_run(printk("markeins_irq_setup invoked.\n"));
77 /* by default, interrupts are disabled. */
78 emma2rh_out32(EMMA2RH_BHIF_INT_EN_0, 0);
79 emma2rh_out32(EMMA2RH_BHIF_INT_EN_1, 0);
80 emma2rh_out32(EMMA2RH_BHIF_INT_EN_2, 0);
81 emma2rh_out32(EMMA2RH_BHIF_INT1_EN_0, 0);
82 emma2rh_out32(EMMA2RH_BHIF_INT1_EN_1, 0);
83 emma2rh_out32(EMMA2RH_BHIF_INT1_EN_2, 0);
84 emma2rh_out32(EMMA2RH_BHIF_SW_INT_EN, 0);
86 clear_c0_status(0xff00);
87 set_c0_status(0x0400);
89 #define GPIO_PCI (0xf<<15)
90 /* setup GPIO interrupt for PCI interface */
92 reg = emma2rh_in32(EMMA2RH_GPIO_DIR);
93 emma2rh_out32(EMMA2RH_GPIO_DIR, reg & ~GPIO_PCI);
94 /* disable interrupt */
95 reg = emma2rh_in32(EMMA2RH_GPIO_INT_MASK);
96 emma2rh_out32(EMMA2RH_GPIO_INT_MASK, reg & ~GPIO_PCI);
98 reg = emma2rh_in32(EMMA2RH_GPIO_INT_MODE);
99 emma2rh_out32(EMMA2RH_GPIO_INT_MODE, reg | GPIO_PCI);
100 reg = emma2rh_in32(EMMA2RH_GPIO_INT_CND_A);
101 emma2rh_out32(EMMA2RH_GPIO_INT_CND_A, reg & (~GPIO_PCI));
102 /* interrupt clear */
103 emma2rh_out32(EMMA2RH_GPIO_INT_ST, ~GPIO_PCI);
105 /* init all controllers */
106 emma2rh_irq_init(EMMA2RH_IRQ_BASE);
107 emma2rh_sw_irq_init(EMMA2RH_SW_IRQ_BASE);
108 emma2rh_gpio_irq_init(EMMA2RH_GPIO_IRQ_BASE);
109 mips_cpu_irq_init(CPU_IRQ_BASE);
111 /* setup cascade interrupts */
112 setup_irq(EMMA2RH_IRQ_BASE + EMMA2RH_SW_CASCADE, &irq_cascade);
113 setup_irq(EMMA2RH_IRQ_BASE + EMMA2RH_GPIO_CASCADE, &irq_cascade);
114 setup_irq(CPU_IRQ_BASE + CPU_EMMA2RH_CASCADE, &irq_cascade);
117 asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
119 unsigned int pending = read_c0_status() & read_c0_cause();
121 if (pending & STATUSF_IP7)
122 do_IRQ(CPU_IRQ_BASE + 7, regs);
123 else if (pending & STATUSF_IP2)
124 emma2rh_irq_dispatch(regs);
125 else if (pending & STATUSF_IP1)
126 do_IRQ(CPU_IRQ_BASE + 1, regs);
127 else if (pending & STATUSF_IP0)
128 do_IRQ(CPU_IRQ_BASE + 0, regs);
130 spurious_interrupt(regs);