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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 | // SPDX-License-Identifier: GPL-2.0 /* * ip22-int.c: Routines for generic manipulation of the INT[23] ASIC * found on INDY and Indigo2 workstations. * * Copyright (C) 1996 David S. Miller (davem@davemloft.net) * Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org) * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu) * - Indigo2 changes * - Interrupt handling fixes * Copyright (C) 2001, 2003 Ladislav Michl (ladis@linux-mips.org) */ #include <linux/types.h> #include <linux/init.h> #include <linux/kernel_stat.h> #include <linux/interrupt.h> #include <linux/ftrace.h> #include <asm/irq_cpu.h> #include <asm/sgi/hpc3.h> #include <asm/sgi/ip22.h> /* So far nothing hangs here */ #undef USE_LIO3_IRQ struct sgint_regs *sgint; static char lc0msk_to_irqnr[256]; static char lc1msk_to_irqnr[256]; static char lc2msk_to_irqnr[256]; static char lc3msk_to_irqnr[256]; extern int ip22_eisa_init(void); static void enable_local0_irq(struct irq_data *d) { /* don't allow mappable interrupt to be enabled from setup_irq, * we have our own way to do so */ if (d->irq != SGI_MAP_0_IRQ) sgint->imask0 |= (1 << (d->irq - SGINT_LOCAL0)); } static void disable_local0_irq(struct irq_data *d) { sgint->imask0 &= ~(1 << (d->irq - SGINT_LOCAL0)); } static struct irq_chip ip22_local0_irq_type = { .name = "IP22 local 0", .irq_mask = disable_local0_irq, .irq_unmask = enable_local0_irq, }; static void enable_local1_irq(struct irq_data *d) { /* don't allow mappable interrupt to be enabled from setup_irq, * we have our own way to do so */ if (d->irq != SGI_MAP_1_IRQ) sgint->imask1 |= (1 << (d->irq - SGINT_LOCAL1)); } static void disable_local1_irq(struct irq_data *d) { sgint->imask1 &= ~(1 << (d->irq - SGINT_LOCAL1)); } static struct irq_chip ip22_local1_irq_type = { .name = "IP22 local 1", .irq_mask = disable_local1_irq, .irq_unmask = enable_local1_irq, }; static void enable_local2_irq(struct irq_data *d) { sgint->imask0 |= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0)); sgint->cmeimask0 |= (1 << (d->irq - SGINT_LOCAL2)); } static void disable_local2_irq(struct irq_data *d) { sgint->cmeimask0 &= ~(1 << (d->irq - SGINT_LOCAL2)); if (!sgint->cmeimask0) sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0)); } static struct irq_chip ip22_local2_irq_type = { .name = "IP22 local 2", .irq_mask = disable_local2_irq, .irq_unmask = enable_local2_irq, }; static void enable_local3_irq(struct irq_data *d) { sgint->imask1 |= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1)); sgint->cmeimask1 |= (1 << (d->irq - SGINT_LOCAL3)); } static void disable_local3_irq(struct irq_data *d) { sgint->cmeimask1 &= ~(1 << (d->irq - SGINT_LOCAL3)); if (!sgint->cmeimask1) sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1)); } static struct irq_chip ip22_local3_irq_type = { .name = "IP22 local 3", .irq_mask = disable_local3_irq, .irq_unmask = enable_local3_irq, }; static void indy_local0_irqdispatch(void) { u8 mask = sgint->istat0 & sgint->imask0; u8 mask2; int irq; if (mask & SGINT_ISTAT0_LIO2) { mask2 = sgint->vmeistat & sgint->cmeimask0; irq = lc2msk_to_irqnr[mask2]; } else irq = lc0msk_to_irqnr[mask]; /* * workaround for INT2 bug; if irq == 0, INT2 has seen a fifo full * irq, but failed to latch it into status register */ if (irq) do_IRQ(irq); else do_IRQ(SGINT_LOCAL0 + 0); } static void indy_local1_irqdispatch(void) { u8 mask = sgint->istat1 & sgint->imask1; u8 mask2; int irq; if (mask & SGINT_ISTAT1_LIO3) { mask2 = sgint->vmeistat & sgint->cmeimask1; irq = lc3msk_to_irqnr[mask2]; } else irq = lc1msk_to_irqnr[mask]; /* if irq == 0, then the interrupt has already been cleared */ if (irq) do_IRQ(irq); } extern void ip22_be_interrupt(int irq); static void __irq_entry indy_buserror_irq(void) { int irq = SGI_BUSERR_IRQ; irq_enter(); kstat_incr_irq_this_cpu(irq); ip22_be_interrupt(irq); irq_exit(); } #ifdef USE_LIO3_IRQ #define SGI_INTERRUPTS SGINT_END #else #define SGI_INTERRUPTS SGINT_LOCAL3 #endif extern void indy_8254timer_irq(void); /* * IRQs on the INDY look basically (barring software IRQs which we don't use * at all) like: * * MIPS IRQ Source * -------- ------ * 0 Software (ignored) * 1 Software (ignored) * 2 Local IRQ level zero * 3 Local IRQ level one * 4 8254 Timer zero * 5 8254 Timer one * 6 Bus Error * 7 R4k timer (what we use) * * We handle the IRQ according to _our_ priority which is: * * Highest ---- R4k Timer * Local IRQ zero * Local IRQ one * Bus Error * 8254 Timer zero * Lowest ---- 8254 Timer one * * then we just return, if multiple IRQs are pending then we will just take * another exception, big deal. */ asmlinkage void plat_irq_dispatch(void) { unsigned int pending = read_c0_status() & read_c0_cause(); /* * First we check for r4k counter/timer IRQ. */ if (pending & CAUSEF_IP7) do_IRQ(SGI_TIMER_IRQ); else if (pending & CAUSEF_IP2) indy_local0_irqdispatch(); else if (pending & CAUSEF_IP3) indy_local1_irqdispatch(); else if (pending & CAUSEF_IP6) indy_buserror_irq(); else if (pending & (CAUSEF_IP4 | CAUSEF_IP5)) indy_8254timer_irq(); } void __init arch_init_irq(void) { int i; /* Init local mask --> irq tables. */ for (i = 0; i < 256; i++) { if (i & 0x80) { lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7; lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7; lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7; lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7; } else if (i & 0x40) { lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6; lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6; lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6; lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6; } else if (i & 0x20) { lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5; lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5; lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5; lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5; } else if (i & 0x10) { lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4; lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4; lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4; lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4; } else if (i & 0x08) { lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3; lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3; lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3; lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3; } else if (i & 0x04) { lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2; lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2; lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2; lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2; } else if (i & 0x02) { lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1; lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1; lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1; lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1; } else if (i & 0x01) { lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0; lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0; lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0; lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0; } else { lc0msk_to_irqnr[i] = 0; lc1msk_to_irqnr[i] = 0; lc2msk_to_irqnr[i] = 0; lc3msk_to_irqnr[i] = 0; } } /* Mask out all interrupts. */ sgint->imask0 = 0; sgint->imask1 = 0; sgint->cmeimask0 = 0; sgint->cmeimask1 = 0; /* init CPU irqs */ mips_cpu_irq_init(); for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) { struct irq_chip *handler; if (i < SGINT_LOCAL1) handler = &ip22_local0_irq_type; else if (i < SGINT_LOCAL2) handler = &ip22_local1_irq_type; else if (i < SGINT_LOCAL3) handler = &ip22_local2_irq_type; else handler = &ip22_local3_irq_type; irq_set_chip_and_handler(i, handler, handle_level_irq); } /* vector handler. this register the IRQ as non-sharable */ if (request_irq(SGI_LOCAL_0_IRQ, no_action, IRQF_NO_THREAD, "local0 cascade", NULL)) pr_err("Failed to register local0 cascade interrupt\n"); if (request_irq(SGI_LOCAL_1_IRQ, no_action, IRQF_NO_THREAD, "local1 cascade", NULL)) pr_err("Failed to register local1 cascade interrupt\n"); if (request_irq(SGI_BUSERR_IRQ, no_action, IRQF_NO_THREAD, "Bus Error", NULL)) pr_err("Failed to register Bus Error interrupt\n"); /* cascade in cascade. i love Indy ;-) */ if (request_irq(SGI_MAP_0_IRQ, no_action, IRQF_NO_THREAD, "mapable0 cascade", NULL)) pr_err("Failed to register mapable0 cascade interrupt\n"); #ifdef USE_LIO3_IRQ if (request_irq(SGI_MAP_1_IRQ, no_action, IRQF_NO_THREAD, "mapable1 cascade", NULL)) pr_err("Failed to register mapable1 cascade interrupt\n"); #endif #ifdef CONFIG_EISA if (ip22_is_fullhouse()) /* Only Indigo-2 has EISA stuff */ ip22_eisa_init(); #endif } |