diff options
Diffstat (limited to 'arch/mips/mips-boards/generic/mipsIRQ.S')
| -rw-r--r-- | arch/mips/mips-boards/generic/mipsIRQ.S | 157 |
1 files changed, 0 insertions, 157 deletions
diff --git a/arch/mips/mips-boards/generic/mipsIRQ.S b/arch/mips/mips-boards/generic/mipsIRQ.S deleted file mode 100644 index 973e10aaacd5..000000000000 --- a/arch/mips/mips-boards/generic/mipsIRQ.S +++ /dev/null | |||
| @@ -1,157 +0,0 @@ | |||
| 1 | /* | ||
| 2 | * Carsten Langgaard, carstenl@mips.com | ||
| 3 | * Copyright (C) 1999, 2000 MIPS Technologies, Inc. All rights reserved. | ||
| 4 | * | ||
| 5 | * ######################################################################## | ||
| 6 | * | ||
| 7 | * This program is free software; you can distribute it and/or modify it | ||
| 8 | * under the terms of the GNU General Public License (Version 2) as | ||
| 9 | * published by the Free Software Foundation. | ||
| 10 | * | ||
| 11 | * This program is distributed in the hope it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * for more details. | ||
| 15 | * | ||
| 16 | * You should have received a copy of the GNU General Public License along | ||
| 17 | * with this program; if not, write to the Free Software Foundation, Inc., | ||
| 18 | * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. | ||
| 19 | * | ||
| 20 | * ######################################################################## | ||
| 21 | * | ||
| 22 | * Interrupt exception dispatch code. | ||
| 23 | * | ||
| 24 | */ | ||
| 25 | #include <linux/config.h> | ||
| 26 | |||
| 27 | #include <asm/asm.h> | ||
| 28 | #include <asm/mipsregs.h> | ||
| 29 | #include <asm/regdef.h> | ||
| 30 | #include <asm/stackframe.h> | ||
| 31 | |||
| 32 | #ifdef CONFIG_MIPS_ATLAS | ||
| 33 | #include <asm/mips-boards/atlasint.h> | ||
| 34 | #define CASCADE_IRQ MIPSCPU_INT_ATLAS | ||
| 35 | #define CASCADE_DISPATCH atlas_hw0_irqdispatch | ||
| 36 | #endif | ||
| 37 | #ifdef CONFIG_MIPS_MALTA | ||
| 38 | #include <asm/mips-boards/maltaint.h> | ||
| 39 | #define CASCADE_IRQ MIPSCPU_INT_I8259A | ||
| 40 | #define CASCADE_DISPATCH malta_hw0_irqdispatch | ||
| 41 | #endif | ||
| 42 | #ifdef CONFIG_MIPS_SEAD | ||
| 43 | #include <asm/mips-boards/seadint.h> | ||
| 44 | #endif | ||
| 45 | |||
| 46 | /* A lot of complication here is taken away because: | ||
| 47 | * | ||
| 48 | * 1) We handle one interrupt and return, sitting in a loop and moving across | ||
| 49 | * all the pending IRQ bits in the cause register is _NOT_ the answer, the | ||
| 50 | * common case is one pending IRQ so optimize in that direction. | ||
| 51 | * | ||
| 52 | * 2) We need not check against bits in the status register IRQ mask, that | ||
| 53 | * would make this routine slow as hell. | ||
| 54 | * | ||
| 55 | * 3) Linux only thinks in terms of all IRQs on or all IRQs off, nothing in | ||
| 56 | * between like BSD spl() brain-damage. | ||
| 57 | * | ||
| 58 | * Furthermore, the IRQs on the MIPS board look basically (barring software | ||
| 59 | * IRQs which we don't use at all and all external interrupt sources are | ||
| 60 | * combined together on hardware interrupt 0 (MIPS IRQ 2)) like: | ||
| 61 | * | ||
| 62 | * MIPS IRQ Source | ||
| 63 | * -------- ------ | ||
| 64 | * 0 Software (ignored) | ||
| 65 | * 1 Software (ignored) | ||
| 66 | * 2 Combined hardware interrupt (hw0) | ||
| 67 | * 3 Hardware (ignored) | ||
| 68 | * 4 Hardware (ignored) | ||
| 69 | * 5 Hardware (ignored) | ||
| 70 | * 6 Hardware (ignored) | ||
| 71 | * 7 R4k timer (what we use) | ||
| 72 | * | ||
| 73 | * Note: On the SEAD board thing are a little bit different. | ||
| 74 | * Here IRQ 2 (hw0) is wired to the UART0 and IRQ 3 (hw1) is wired | ||
| 75 | * wired to UART1. | ||
| 76 | * | ||
| 77 | * We handle the IRQ according to _our_ priority which is: | ||
| 78 | * | ||
| 79 | * Highest ---- R4k Timer | ||
| 80 | * Lowest ---- Combined hardware interrupt | ||
| 81 | * | ||
| 82 | * then we just return, if multiple IRQs are pending then we will just take | ||
| 83 | * another exception, big deal. | ||
| 84 | */ | ||
| 85 | |||
| 86 | .text | ||
| 87 | .set noreorder | ||
| 88 | .set noat | ||
| 89 | .align 5 | ||
| 90 | NESTED(mipsIRQ, PT_SIZE, sp) | ||
| 91 | SAVE_ALL | ||
| 92 | CLI | ||
| 93 | .set at | ||
| 94 | |||
| 95 | mfc0 s0, CP0_CAUSE # get irq bits | ||
| 96 | mfc0 s1, CP0_STATUS # get irq mask | ||
| 97 | andi s0, ST0_IM # CAUSE.CE may be non-zero! | ||
| 98 | and s0, s1 | ||
| 99 | |||
| 100 | #if defined(CONFIG_CPU_MIPS32) || defined(CONFIG_CPU_MIPS64) | ||
| 101 | .set mips32 | ||
| 102 | clz a0, s0 | ||
| 103 | .set mips0 | ||
| 104 | negu a0 | ||
| 105 | addu a0, 31-CAUSEB_IP | ||
| 106 | bltz a0, spurious | ||
| 107 | #else | ||
| 108 | beqz s0, spurious | ||
| 109 | li a0, 7 | ||
| 110 | |||
| 111 | and t0, s0, 0xf000 | ||
| 112 | sltiu t0, t0, 1 | ||
| 113 | sll t0, 2 | ||
| 114 | subu a0, t0 | ||
| 115 | sll s0, t0 | ||
| 116 | |||
| 117 | and t0, s0, 0xc000 | ||
| 118 | sltiu t0, t0, 1 | ||
| 119 | sll t0, 1 | ||
| 120 | subu a0, t0 | ||
| 121 | sll s0, t0 | ||
| 122 | |||
| 123 | and t0, s0, 0x8000 | ||
| 124 | sltiu t0, t0, 1 | ||
| 125 | # sll t0, 0 | ||
| 126 | subu a0, t0 | ||
| 127 | # sll s0, t0 | ||
| 128 | #endif | ||
| 129 | |||
| 130 | #ifdef CASCADE_IRQ | ||
| 131 | li a1, CASCADE_IRQ | ||
| 132 | bne a0, a1, 1f | ||
| 133 | addu a0, MIPSCPU_INT_BASE | ||
| 134 | |||
| 135 | jal CASCADE_DISPATCH | ||
| 136 | move a0, sp | ||
| 137 | |||
| 138 | j ret_from_irq | ||
| 139 | nop | ||
| 140 | 1: | ||
| 141 | #else | ||
| 142 | addu a0, MIPSCPU_INT_BASE | ||
| 143 | #endif | ||
| 144 | |||
| 145 | jal do_IRQ | ||
| 146 | move a1, sp | ||
| 147 | |||
| 148 | j ret_from_irq | ||
| 149 | nop | ||
| 150 | |||
| 151 | |||
| 152 | spurious: | ||
| 153 | jal spurious_interrupt | ||
| 154 | nop | ||
| 155 | j ret_from_irq | ||
| 156 | nop | ||
| 157 | END(mipsIRQ) | ||