Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 1995, 1996, 1997, 1998 by Ralf Baechle and Andreas Busse |
| 7 | * |
| 8 | * Jazz family specific interrupt stuff |
| 9 | * |
| 10 | * To do: On Jazz machines we remap some non-ISA interrupts to ISA |
| 11 | * interrupts. These interrupts should use their own vectors. |
| 12 | * Squeeze the last cycles out of the handlers. Only a dead |
| 13 | * cycle is a good cycle. |
| 14 | */ |
| 15 | #include <asm/asm.h> |
| 16 | #include <asm/mipsregs.h> |
| 17 | #include <asm/jazz.h> |
| 18 | #include <asm/regdef.h> |
| 19 | #include <asm/stackframe.h> |
| 20 | |
| 21 | /* |
| 22 | * jazz_handle_int: Interrupt handler for the ACER Pica-61 boards |
| 23 | */ |
| 24 | .set noreorder |
| 25 | |
| 26 | NESTED(jazz_handle_int, PT_SIZE, ra) |
| 27 | .set noat |
| 28 | SAVE_ALL |
| 29 | CLI |
| 30 | .set at |
| 31 | |
| 32 | /* |
| 33 | * Get pending interrupts |
| 34 | */ |
| 35 | mfc0 t0,CP0_CAUSE # get pending interrupts |
| 36 | mfc0 t1,CP0_STATUS # get enabled interrupts |
| 37 | and t0,t1 # isolate allowed ones |
| 38 | andi t0,0xff00 # isolate pending bits |
| 39 | beqz t0,3f |
| 40 | sll t0,16 # delay slot |
| 41 | |
| 42 | /* |
| 43 | * Find irq with highest priority |
| 44 | * FIXME: This is slow - use binary search |
| 45 | */ |
| 46 | la t1,ll_vectors |
| 47 | 1: bltz t0,2f # found pending irq |
| 48 | sll t0,1 |
| 49 | b 1b |
| 50 | subu t1,PTRSIZE # delay slot |
| 51 | |
| 52 | /* |
| 53 | * Do the low-level stuff |
| 54 | */ |
| 55 | 2: lw t0,(t1) |
| 56 | jr t0 |
| 57 | nop # delay slot |
| 58 | END(jazz_handle_int) |
| 59 | |
| 60 | ll_sw0: li s1,~IE_SW0 |
| 61 | mfc0 t0,CP0_CAUSE |
| 62 | and t0,s1 |
| 63 | mtc0 t0,CP0_CAUSE |
| 64 | PANIC("Unimplemented sw0 handler") |
| 65 | |
| 66 | ll_sw1: li s1,~IE_SW1 |
| 67 | mfc0 t0,CP0_CAUSE |
| 68 | and t0,s1 |
| 69 | mtc0 t0,CP0_CAUSE |
| 70 | PANIC("Unimplemented sw1 handler") |
| 71 | |
| 72 | ll_local_dma: li s1,~IE_IRQ0 |
| 73 | PANIC("Unimplemented local_dma handler") |
| 74 | |
| 75 | ll_local_dev: lbu t0,JAZZ_IO_IRQ_SOURCE |
| 76 | #if PTRSIZE == 8 /* True 64 bit kernel */ |
| 77 | dsll t0,1 |
| 78 | #endif |
| 79 | .set reorder |
| 80 | LONG_L t0,local_vector(t0) |
| 81 | jr t0 |
| 82 | .set noreorder |
| 83 | |
| 84 | /* |
| 85 | * The braindead PICA hardware gives us no way to distinguish if we really |
| 86 | * received interrupt 7 from the (E)ISA bus or if we just received an |
| 87 | * interrupt with no findable cause. This sometimes happens with braindead |
| 88 | * cards. Oh well - for all the Jazz boxes slots are more or less just |
| 89 | * whistles and bells and we're aware of the problem. |
| 90 | */ |
| 91 | ll_isa_irq: lw a0, JAZZ_EISA_IRQ_ACK |
| 92 | |
| 93 | jal do_IRQ |
| 94 | move a1,sp |
| 95 | |
| 96 | j ret_from_irq |
| 97 | nop |
| 98 | |
| 99 | /* |
| 100 | * Hmm... This is not just a plain PC clone so the question is |
| 101 | * which devices on Jazz machines can generate an (E)ISA NMI? |
| 102 | * (Writing to nonexistent memory?) |
| 103 | */ |
| 104 | ll_isa_nmi: li s1,~IE_IRQ3 |
| 105 | PANIC("Unimplemented isa_nmi handler") |
| 106 | |
| 107 | /* |
| 108 | * Timer IRQ - remapped to be more similar to an IBM compatible. |
| 109 | * |
| 110 | * The timer interrupt is handled specially to ensure that the jiffies |
| 111 | * variable is updated at all times. Specifically, the timer interrupt is |
| 112 | * just like the complete handlers except that it is invoked with interrupts |
| 113 | * disabled and should never re-enable them. If other interrupts were |
| 114 | * allowed to be processed while the timer interrupt is active, then the |
| 115 | * other interrupts would have to avoid using the jiffies variable for delay |
| 116 | * and interval timing operations to avoid hanging the system. |
| 117 | */ |
| 118 | ll_timer: lw zero,JAZZ_TIMER_REGISTER # timer irq cleared on read |
| 119 | li s1,~IE_IRQ4 |
| 120 | |
| 121 | li a0, JAZZ_TIMER_IRQ |
| 122 | jal do_IRQ |
| 123 | move a1,sp |
| 124 | |
| 125 | mfc0 t0,CP0_STATUS # disable interrupts again |
| 126 | ori t0,1 |
| 127 | xori t0,1 |
| 128 | mtc0 t0,CP0_STATUS |
| 129 | |
| 130 | j ret_from_irq |
| 131 | nop |
| 132 | |
| 133 | /* |
| 134 | * CPU count/compare IRQ (unused) |
| 135 | */ |
| 136 | ll_count: j ret_from_irq |
| 137 | mtc0 zero,CP0_COMPARE |
| 138 | |
| 139 | #if 0 |
| 140 | /* |
| 141 | * Call the handler for the interrupt |
| 142 | * (Currently unused) |
| 143 | */ |
| 144 | call_real: /* |
| 145 | * temporarily disable interrupt |
| 146 | */ |
| 147 | mfc0 t2,CP0_STATUS |
| 148 | and t2,s1 |
| 149 | mtc0 t2,CP0_STATUS |
| 150 | nor s1,zero,s1 |
| 151 | jal do_IRQ |
| 152 | |
| 153 | /* |
| 154 | * reenable interrupt |
| 155 | */ |
| 156 | mfc0 t2,CP0_STATUS |
| 157 | or t2,s1 |
| 158 | mtc0 t2,CP0_STATUS |
| 159 | j ret_from_irq |
| 160 | #endif |
| 161 | |
| 162 | .data |
| 163 | PTR ll_sw0 # SW0 |
| 164 | PTR ll_sw1 # SW1 |
| 165 | PTR ll_local_dma # Local DMA |
| 166 | PTR ll_local_dev # Local devices |
| 167 | PTR ll_isa_irq # ISA IRQ |
| 168 | PTR ll_isa_nmi # ISA NMI |
| 169 | PTR ll_timer # Timer |
| 170 | ll_vectors: PTR ll_count # Count/Compare IRQ |
| 171 | |
| 172 | /* |
| 173 | * Interrupt handlers for local devices. |
| 174 | */ |
| 175 | .text |
| 176 | .set reorder |
| 177 | loc_no_irq: PANIC("Unimplemented loc_no_irq handler") |
| 178 | /* |
| 179 | * Parallel port IRQ |
| 180 | */ |
| 181 | loc_parallel: li s1,~JAZZ_IE_PARALLEL |
| 182 | li a0,JAZZ_PARALLEL_IRQ |
| 183 | b loc_call |
| 184 | |
| 185 | /* |
| 186 | * Floppy IRQ |
| 187 | */ |
| 188 | loc_floppy: li s1,~JAZZ_IE_FLOPPY |
| 189 | li a0,JAZZ_FLOPPY_IRQ |
| 190 | b loc_call |
| 191 | |
| 192 | /* |
| 193 | * Sound IRQ |
| 194 | */ |
| 195 | loc_sound: PANIC("Unimplemented loc_sound handler") |
| 196 | loc_video: PANIC("Unimplemented loc_video handler") |
| 197 | |
| 198 | /* |
| 199 | * Ethernet interrupt handler |
| 200 | */ |
| 201 | loc_ethernet: li s1,~JAZZ_IE_ETHERNET |
| 202 | li a0,JAZZ_ETHERNET_IRQ |
| 203 | b loc_call |
| 204 | |
| 205 | /* |
| 206 | * SCSI interrupt handler |
| 207 | */ |
| 208 | loc_scsi: li s1,~JAZZ_IE_SCSI |
| 209 | li a0,JAZZ_SCSI_IRQ |
| 210 | b loc_call |
| 211 | |
| 212 | /* |
| 213 | * Keyboard interrupt handler |
| 214 | */ |
| 215 | loc_keyboard: li s1,~JAZZ_IE_KEYBOARD |
| 216 | li a0,JAZZ_KEYBOARD_IRQ |
| 217 | b loc_call |
| 218 | |
| 219 | /* |
| 220 | * Mouse interrupt handler |
| 221 | */ |
| 222 | loc_mouse: li s1,~JAZZ_IE_MOUSE |
| 223 | li a0,JAZZ_MOUSE_IRQ |
| 224 | b loc_call |
| 225 | |
| 226 | /* |
| 227 | * Serial port 1 IRQ |
| 228 | */ |
| 229 | loc_serial1: li s1,~JAZZ_IE_SERIAL1 |
| 230 | li a0,JAZZ_SERIAL1_IRQ |
| 231 | b loc_call |
| 232 | |
| 233 | /* |
| 234 | * Serial port 2 IRQ |
| 235 | */ |
| 236 | loc_serial2: li s1,~JAZZ_IE_SERIAL2 |
| 237 | li a0,JAZZ_SERIAL2_IRQ |
| 238 | b loc_call |
| 239 | |
| 240 | /* |
| 241 | * Call the interrupt handler for an interrupt generated by a |
| 242 | * local device. |
| 243 | */ |
| 244 | loc_call: /* |
| 245 | * Temporarily disable interrupt source |
| 246 | */ |
| 247 | lhu t2,JAZZ_IO_IRQ_ENABLE |
| 248 | and t2,s1 |
| 249 | sh t2,JAZZ_IO_IRQ_ENABLE |
| 250 | |
Ralf Baechle | a3dddd5 | 2006-03-11 08:18:41 +0000 | [diff] [blame] | 251 | nor s1,zero,s1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | jal do_IRQ |
| 253 | |
Ralf Baechle | a3dddd5 | 2006-03-11 08:18:41 +0000 | [diff] [blame] | 254 | /* |
| 255 | * Reenable interrupt |
| 256 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | lhu t2,JAZZ_IO_IRQ_ENABLE |
Ralf Baechle | a3dddd5 | 2006-03-11 08:18:41 +0000 | [diff] [blame] | 258 | or t2,s1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | sh t2,JAZZ_IO_IRQ_ENABLE |
| 260 | |
Ralf Baechle | a3dddd5 | 2006-03-11 08:18:41 +0000 | [diff] [blame] | 261 | j ret_from_irq |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | |
| 263 | /* |
| 264 | * "Jump extender" to reach spurious_interrupt |
| 265 | */ |
| 266 | 3: j spurious_interrupt |
| 267 | |
| 268 | /* |
| 269 | * Vectors for interrupts generated by local devices |
| 270 | */ |
| 271 | .data |
| 272 | local_vector: PTR loc_no_irq |
| 273 | PTR loc_parallel |
| 274 | PTR loc_floppy |
| 275 | PTR loc_sound |
| 276 | PTR loc_video |
| 277 | PTR loc_ethernet |
| 278 | PTR loc_scsi |
| 279 | PTR loc_keyboard |
| 280 | PTR loc_mouse |
| 281 | PTR loc_serial1 |
| 282 | PTR loc_serial2 |