Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Carsten Langgaard, carstenl@mips.com |
| 3 | * Copyright (C) 1999,2000 MIPS Technologies, Inc. All rights reserved. |
| 4 | * |
| 5 | * This program is free software; you can distribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License (Version 2) as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. |
| 17 | * |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 18 | * Routines for generic manipulation of the interrupts found on the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | * Lasat boards. |
| 20 | */ |
| 21 | #include <linux/init.h> |
| 22 | #include <linux/sched.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/interrupt.h> |
| 25 | #include <linux/kernel_stat.h> |
| 26 | |
| 27 | #include <asm/bootinfo.h> |
| 28 | #include <asm/irq.h> |
| 29 | #include <asm/lasat/lasatint.h> |
| 30 | #include <asm/gdb-stub.h> |
| 31 | |
| 32 | static volatile int *lasat_int_status = NULL; |
| 33 | static volatile int *lasat_int_mask = NULL; |
| 34 | static volatile int lasat_int_mask_shift; |
| 35 | |
| 36 | extern asmlinkage void lasatIRQ(void); |
| 37 | |
| 38 | void disable_lasat_irq(unsigned int irq_nr) |
| 39 | { |
| 40 | unsigned long flags; |
| 41 | |
| 42 | local_irq_save(flags); |
| 43 | *lasat_int_mask &= ~(1 << irq_nr) << lasat_int_mask_shift; |
| 44 | local_irq_restore(flags); |
| 45 | } |
| 46 | |
| 47 | void enable_lasat_irq(unsigned int irq_nr) |
| 48 | { |
| 49 | unsigned long flags; |
| 50 | |
| 51 | local_irq_save(flags); |
| 52 | *lasat_int_mask |= (1 << irq_nr) << lasat_int_mask_shift; |
| 53 | local_irq_restore(flags); |
| 54 | } |
| 55 | |
| 56 | static unsigned int startup_lasat_irq(unsigned int irq) |
| 57 | { |
| 58 | enable_lasat_irq(irq); |
| 59 | |
| 60 | return 0; /* never anything pending */ |
| 61 | } |
| 62 | |
| 63 | #define shutdown_lasat_irq disable_lasat_irq |
| 64 | |
| 65 | #define mask_and_ack_lasat_irq disable_lasat_irq |
| 66 | |
| 67 | static void end_lasat_irq(unsigned int irq) |
| 68 | { |
| 69 | if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) |
| 70 | enable_lasat_irq(irq); |
| 71 | } |
| 72 | |
| 73 | static struct hw_interrupt_type lasat_irq_type = { |
Ralf Baechle | 8ab00b9 | 2005-02-28 13:39:57 +0000 | [diff] [blame] | 74 | .typename = "Lasat", |
| 75 | .startup = startup_lasat_irq, |
| 76 | .shutdown = shutdown_lasat_irq, |
| 77 | .enable = enable_lasat_irq, |
| 78 | .disable = disable_lasat_irq, |
| 79 | .ack = mask_and_ack_lasat_irq, |
| 80 | .end = end_lasat_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | }; |
| 82 | |
| 83 | static inline int ls1bit32(unsigned int x) |
| 84 | { |
| 85 | int b = 31, s; |
| 86 | |
| 87 | s = 16; if (x << 16 == 0) s = 0; b -= s; x <<= s; |
| 88 | s = 8; if (x << 8 == 0) s = 0; b -= s; x <<= s; |
| 89 | s = 4; if (x << 4 == 0) s = 0; b -= s; x <<= s; |
| 90 | s = 2; if (x << 2 == 0) s = 0; b -= s; x <<= s; |
| 91 | s = 1; if (x << 1 == 0) s = 0; b -= s; |
| 92 | |
| 93 | return b; |
| 94 | } |
| 95 | |
| 96 | static unsigned long (* get_int_status)(void); |
| 97 | |
| 98 | static unsigned long get_int_status_100(void) |
| 99 | { |
| 100 | return *lasat_int_status & *lasat_int_mask; |
| 101 | } |
| 102 | |
Ralf Baechle | 42a3b4f | 2005-09-03 15:56:17 -0700 | [diff] [blame] | 103 | static unsigned long get_int_status_200(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | { |
| 105 | unsigned long int_status; |
| 106 | |
| 107 | int_status = *lasat_int_status; |
| 108 | int_status &= (int_status >> LASATINT_MASK_SHIFT_200) & 0xffff; |
| 109 | return int_status; |
| 110 | } |
| 111 | |
| 112 | void lasat_hw0_irqdispatch(struct pt_regs *regs) |
| 113 | { |
| 114 | unsigned long int_status; |
| 115 | int irq; |
| 116 | |
| 117 | int_status = get_int_status(); |
| 118 | |
| 119 | /* if int_status == 0, then the interrupt has already been cleared */ |
| 120 | if (int_status) { |
| 121 | irq = ls1bit32(int_status); |
| 122 | |
| 123 | do_IRQ(irq, regs); |
| 124 | } |
| 125 | } |
| 126 | |
| 127 | void __init arch_init_irq(void) |
| 128 | { |
| 129 | int i; |
| 130 | |
| 131 | switch (mips_machtype) { |
| 132 | case MACH_LASAT_100: |
| 133 | lasat_int_status = (void *)LASAT_INT_STATUS_REG_100; |
| 134 | lasat_int_mask = (void *)LASAT_INT_MASK_REG_100; |
| 135 | lasat_int_mask_shift = LASATINT_MASK_SHIFT_100; |
| 136 | get_int_status = get_int_status_100; |
| 137 | *lasat_int_mask = 0; |
| 138 | break; |
| 139 | case MACH_LASAT_200: |
| 140 | lasat_int_status = (void *)LASAT_INT_STATUS_REG_200; |
| 141 | lasat_int_mask = (void *)LASAT_INT_MASK_REG_200; |
| 142 | lasat_int_mask_shift = LASATINT_MASK_SHIFT_200; |
| 143 | get_int_status = get_int_status_200; |
| 144 | *lasat_int_mask &= 0xffff; |
| 145 | break; |
| 146 | default: |
| 147 | panic("arch_init_irq: mips_machtype incorrect"); |
| 148 | } |
| 149 | |
| 150 | /* Now safe to set the exception vector. */ |
| 151 | set_except_vector(0, lasatIRQ); |
| 152 | |
| 153 | for (i = 0; i <= LASATINT_END; i++) { |
| 154 | irq_desc[i].status = IRQ_DISABLED; |
| 155 | irq_desc[i].action = 0; |
| 156 | irq_desc[i].depth = 1; |
| 157 | irq_desc[i].handler = &lasat_irq_type; |
| 158 | } |
| 159 | } |