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1da177e4 LT |
1 | /* irq.c: FRV IRQ handling |
2 | * | |
1bcbba30 | 3 | * Copyright (C) 2003, 2004, 2006 Red Hat, Inc. All Rights Reserved. |
1da177e4 LT |
4 | * Written by David Howells (dhowells@redhat.com) |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/ptrace.h> |
13 | #include <linux/errno.h> | |
14 | #include <linux/signal.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/ioport.h> | |
17 | #include <linux/interrupt.h> | |
18 | #include <linux/timex.h> | |
1da177e4 | 19 | #include <linux/random.h> |
1da177e4 LT |
20 | #include <linux/init.h> |
21 | #include <linux/kernel_stat.h> | |
22 | #include <linux/irq.h> | |
23 | #include <linux/proc_fs.h> | |
24 | #include <linux/seq_file.h> | |
40234401 | 25 | #include <linux/module.h> |
1977f032 | 26 | #include <linux/bitops.h> |
1da177e4 | 27 | |
60063497 | 28 | #include <linux/atomic.h> |
1da177e4 LT |
29 | #include <asm/io.h> |
30 | #include <asm/smp.h> | |
31 | #include <asm/system.h> | |
1da177e4 LT |
32 | #include <asm/uaccess.h> |
33 | #include <asm/pgalloc.h> | |
34 | #include <asm/delay.h> | |
35 | #include <asm/irq.h> | |
36 | #include <asm/irc-regs.h> | |
1da177e4 LT |
37 | #include <asm/gdb-stub.h> |
38 | ||
1bcbba30 | 39 | #define set_IRR(N,A,B,C,D) __set_IRR(N, (A << 28) | (B << 24) | (C << 20) | (D << 16)) |
1da177e4 | 40 | |
1bcbba30 DH |
41 | extern void __init fpga_init(void); |
42 | #ifdef CONFIG_FUJITSU_MB93493 | |
43 | extern void __init mb93493_init(void); | |
44 | #endif | |
1da177e4 | 45 | |
1bcbba30 | 46 | #define __reg16(ADDR) (*(volatile unsigned short *)(ADDR)) |
1da177e4 LT |
47 | |
48 | atomic_t irq_err_count; | |
49 | ||
a120017c | 50 | int arch_show_interrupts(struct seq_file *p, int prec) |
1da177e4 | 51 | { |
a120017c TG |
52 | seq_printf(p, "%*s: ", prec, "ERR"); |
53 | seq_printf(p, "%10u\n", atomic_read(&irq_err_count)); | |
1da177e4 LT |
54 | return 0; |
55 | } | |
56 | ||
1da177e4 | 57 | /* |
1bcbba30 | 58 | * on-CPU PIC operations |
1da177e4 | 59 | */ |
380e3111 | 60 | static void frv_cpupic_ack(struct irq_data *d) |
1da177e4 | 61 | { |
380e3111 | 62 | __clr_RC(d->irq); |
1bcbba30 DH |
63 | __clr_IRL(); |
64 | } | |
1da177e4 | 65 | |
380e3111 | 66 | static void frv_cpupic_mask(struct irq_data *d) |
1bcbba30 | 67 | { |
380e3111 | 68 | __set_MASK(d->irq); |
1bcbba30 | 69 | } |
1da177e4 | 70 | |
380e3111 | 71 | static void frv_cpupic_mask_ack(struct irq_data *d) |
1bcbba30 | 72 | { |
380e3111 TG |
73 | __set_MASK(d->irq); |
74 | __clr_RC(d->irq); | |
1bcbba30 DH |
75 | __clr_IRL(); |
76 | } | |
1da177e4 | 77 | |
380e3111 | 78 | static void frv_cpupic_unmask(struct irq_data *d) |
1bcbba30 | 79 | { |
380e3111 | 80 | __clr_MASK(d->irq); |
1bcbba30 | 81 | } |
1da177e4 | 82 | |
1bcbba30 DH |
83 | static struct irq_chip frv_cpu_pic = { |
84 | .name = "cpu", | |
380e3111 TG |
85 | .irq_ack = frv_cpupic_ack, |
86 | .irq_mask = frv_cpupic_mask, | |
87 | .irq_mask_ack = frv_cpupic_mask_ack, | |
88 | .irq_unmask = frv_cpupic_unmask, | |
1bcbba30 | 89 | }; |
40234401 | 90 | |
1da177e4 | 91 | /* |
761a7e35 | 92 | * handles all normal device IRQs |
1da177e4 LT |
93 | * - registers are referred to by the __frame variable (GR28) |
94 | * - IRQ distribution is complicated in this arch because of the many PICs, the | |
95 | * way they work and the way they cascade | |
96 | */ | |
97 | asmlinkage void do_IRQ(void) | |
98 | { | |
28baebae | 99 | irq_enter(); |
7d12e780 | 100 | generic_handle_irq(__get_IRL()); |
28baebae | 101 | irq_exit(); |
1bcbba30 | 102 | } |
1da177e4 | 103 | |
1da177e4 LT |
104 | /* |
105 | * handles all NMIs when not co-opted by the debugger | |
106 | * - registers are referred to by the __frame variable (GR28) | |
107 | */ | |
108 | asmlinkage void do_NMI(void) | |
109 | { | |
1da177e4 LT |
110 | } |
111 | ||
1da177e4 | 112 | /* |
1bcbba30 | 113 | * initialise the interrupt system |
1da177e4 | 114 | */ |
1bcbba30 | 115 | void __init init_IRQ(void) |
1da177e4 | 116 | { |
1bcbba30 | 117 | int level; |
1da177e4 | 118 | |
1bcbba30 | 119 | for (level = 1; level <= 14; level++) |
de2e95a6 | 120 | irq_set_chip_and_handler(level, &frv_cpu_pic, |
1bcbba30 | 121 | handle_level_irq); |
1da177e4 | 122 | |
de2e95a6 | 123 | irq_set_handler(IRQ_CPU_TIMER0, handle_edge_irq); |
1da177e4 | 124 | |
1bcbba30 DH |
125 | /* set the trigger levels for internal interrupt sources |
126 | * - timers all falling-edge | |
127 | * - ERR0 is rising-edge | |
128 | * - all others are high-level | |
1da177e4 | 129 | */ |
1bcbba30 DH |
130 | __set_IITMR(0, 0x003f0000); /* DMA0-3, TIMER0-2 */ |
131 | __set_IITMR(1, 0x20000000); /* ERR0-1, UART0-1, DMA4-7 */ | |
132 | ||
133 | /* route internal interrupts */ | |
134 | set_IRR(4, IRQ_DMA3_LEVEL, IRQ_DMA2_LEVEL, IRQ_DMA1_LEVEL, | |
135 | IRQ_DMA0_LEVEL); | |
136 | set_IRR(5, 0, IRQ_TIMER2_LEVEL, IRQ_TIMER1_LEVEL, IRQ_TIMER0_LEVEL); | |
137 | set_IRR(6, IRQ_GDBSTUB_LEVEL, IRQ_GDBSTUB_LEVEL, | |
138 | IRQ_UART1_LEVEL, IRQ_UART0_LEVEL); | |
139 | set_IRR(7, IRQ_DMA7_LEVEL, IRQ_DMA6_LEVEL, IRQ_DMA5_LEVEL, | |
140 | IRQ_DMA4_LEVEL); | |
141 | ||
142 | /* route external interrupts */ | |
143 | set_IRR(2, IRQ_XIRQ7_LEVEL, IRQ_XIRQ6_LEVEL, IRQ_XIRQ5_LEVEL, | |
144 | IRQ_XIRQ4_LEVEL); | |
145 | set_IRR(3, IRQ_XIRQ3_LEVEL, IRQ_XIRQ2_LEVEL, IRQ_XIRQ1_LEVEL, | |
146 | IRQ_XIRQ0_LEVEL); | |
147 | ||
148 | #if defined(CONFIG_MB93091_VDK) | |
149 | __set_TM1(0x55550000); /* XIRQ7-0 all active low */ | |
150 | #elif defined(CONFIG_MB93093_PDK) | |
151 | __set_TM1(0x15550000); /* XIRQ7 active high, 6-0 all active low */ | |
152 | #else | |
153 | #error dont know external IRQ trigger levels for this setup | |
154 | #endif | |
1da177e4 | 155 | |
1da177e4 LT |
156 | fpga_init(); |
157 | #ifdef CONFIG_FUJITSU_MB93493 | |
1bcbba30 | 158 | mb93493_init(); |
1da177e4 | 159 | #endif |
1bcbba30 | 160 | } |