1 /*- 2 * Copyright (C) 2002 Benno Rice. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY Benno Rice ``AS IS'' AND ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 17 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 18 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 20 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 21 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 22 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 23 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 * 25 * $FreeBSD$ 26 */ 27 28 #include <sys/param.h> 29 #include <sys/systm.h> 30 #include <sys/bus.h> 31 #include <sys/conf.h> 32 #include <sys/kernel.h> 33 #include <sys/proc.h> 34 #include <sys/rman.h> 35 #include <sys/sched.h> 36 37 #include <machine/bus.h> 38 #include <machine/intr_machdep.h> 39 #include <machine/md_var.h> 40 #include <machine/pio.h> 41 #include <machine/resource.h> 42 43 #include <vm/vm.h> 44 #include <vm/pmap.h> 45 46 #include <machine/openpicreg.h> 47 #include <machine/openpicvar.h> 48 49 #include "pic_if.h" 50 51 devclass_t openpic_devclass; 52 53 /* 54 * Local routines 55 */ 56 static int openpic_intr(void *arg); 57 58 static __inline uint32_t 59 openpic_read(struct openpic_softc *sc, u_int reg) 60 { 61 return (bus_space_read_4(sc->sc_bt, sc->sc_bh, reg)); 62 } 63 64 static __inline void 65 openpic_write(struct openpic_softc *sc, u_int reg, uint32_t val) 66 { 67 bus_space_write_4(sc->sc_bt, sc->sc_bh, reg, val); 68 } 69 70 static __inline void 71 openpic_set_priority(struct openpic_softc *sc, int pri) 72 { 73 u_int tpr; 74 uint32_t x; 75 76 sched_pin(); 77 tpr = OPENPIC_PCPU_TPR((sc->sc_dev == root_pic) ? PCPU_GET(cpuid) : 0); 78 x = openpic_read(sc, tpr); 79 x &= ~OPENPIC_TPR_MASK; 80 x |= pri; 81 openpic_write(sc, tpr, x); 82 sched_unpin(); 83 } 84 85 int 86 openpic_attach(device_t dev) 87 { 88 struct openpic_softc *sc; 89 u_int cpu, ipi, irq; 90 u_int32_t x; 91 92 sc = device_get_softc(dev); 93 sc->sc_dev = dev; 94 95 sc->sc_rid = 0; 96 sc->sc_memr = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &sc->sc_rid, 97 RF_ACTIVE); 98 99 if (sc->sc_memr == NULL) { 100 device_printf(dev, "Could not alloc mem resource!\n"); 101 return (ENXIO); 102 } 103 104 sc->sc_bt = rman_get_bustag(sc->sc_memr); 105 sc->sc_bh = rman_get_bushandle(sc->sc_memr); 106 107 /* Reset the PIC */ 108 x = openpic_read(sc, OPENPIC_CONFIG); 109 x |= OPENPIC_CONFIG_RESET; 110 openpic_write(sc, OPENPIC_CONFIG, x); 111 112 while (openpic_read(sc, OPENPIC_CONFIG) & OPENPIC_CONFIG_RESET) { 113 powerpc_sync(); 114 DELAY(100); 115 } 116 117 /* Check if this is a cascaded PIC */ 118 sc->sc_irq = 0; 119 sc->sc_intr = NULL; 120 do { 121 struct resource_list *rl; 122 123 rl = BUS_GET_RESOURCE_LIST(device_get_parent(dev), dev); 124 if (rl == NULL) 125 break; 126 if (resource_list_find(rl, SYS_RES_IRQ, 0) == NULL) 127 break; 128 129 sc->sc_intr = bus_alloc_resource_any(dev, SYS_RES_IRQ, 130 &sc->sc_irq, RF_ACTIVE); 131 132 /* XXX Cascaded PICs pass NULL trapframes! */ 133 bus_setup_intr(dev, sc->sc_intr, INTR_TYPE_MISC | INTR_MPSAFE, 134 openpic_intr, NULL, dev, &sc->sc_icookie); 135 } while (0); 136 137 /* Reset the PIC */ 138 x = openpic_read(sc, OPENPIC_CONFIG); 139 x |= OPENPIC_CONFIG_RESET; 140 openpic_write(sc, OPENPIC_CONFIG, x); 141 142 while (openpic_read(sc, OPENPIC_CONFIG) & OPENPIC_CONFIG_RESET) { 143 powerpc_sync(); 144 DELAY(100); 145 } 146 147 x = openpic_read(sc, OPENPIC_FEATURE); 148 switch (x & OPENPIC_FEATURE_VERSION_MASK) { 149 case 1: 150 sc->sc_version = "1.0"; 151 break; 152 case 2: 153 sc->sc_version = "1.2"; 154 break; 155 case 3: 156 sc->sc_version = "1.3"; 157 break; 158 default: 159 sc->sc_version = "unknown"; 160 break; 161 } 162 163 sc->sc_ncpu = ((x & OPENPIC_FEATURE_LAST_CPU_MASK) >> 164 OPENPIC_FEATURE_LAST_CPU_SHIFT) + 1; 165 sc->sc_nirq = ((x & OPENPIC_FEATURE_LAST_IRQ_MASK) >> 166 OPENPIC_FEATURE_LAST_IRQ_SHIFT) + 1; 167 168 /* 169 * PSIM seems to report 1 too many IRQs and CPUs 170 */ 171 if (sc->sc_psim) { 172 sc->sc_nirq--; 173 sc->sc_ncpu--; 174 } 175 176 if (bootverbose) 177 device_printf(dev, 178 "Version %s, supports %d CPUs and %d irqs\n", 179 sc->sc_version, sc->sc_ncpu, sc->sc_nirq); 180 181 for (cpu = 0; cpu < sc->sc_ncpu; cpu++) 182 openpic_write(sc, OPENPIC_PCPU_TPR(cpu), 15); 183 184 /* Reset and disable all interrupts. */ 185 for (irq = 0; irq < sc->sc_nirq; irq++) { 186 x = irq; /* irq == vector. */ 187 x |= OPENPIC_IMASK; 188 x |= OPENPIC_POLARITY_NEGATIVE; 189 x |= OPENPIC_SENSE_LEVEL; 190 x |= 8 << OPENPIC_PRIORITY_SHIFT; 191 openpic_write(sc, OPENPIC_SRC_VECTOR(irq), x); 192 } 193 194 /* Reset and disable all IPIs. */ 195 for (ipi = 0; ipi < 4; ipi++) { 196 x = sc->sc_nirq + ipi; 197 x |= OPENPIC_IMASK; 198 x |= 15 << OPENPIC_PRIORITY_SHIFT; 199 openpic_write(sc, OPENPIC_IPI_VECTOR(ipi), x); 200 } 201 202 /* we don't need 8259 passthrough mode */ 203 x = openpic_read(sc, OPENPIC_CONFIG); 204 x |= OPENPIC_CONFIG_8259_PASSTHRU_DISABLE; 205 openpic_write(sc, OPENPIC_CONFIG, x); 206 207 /* send all interrupts to cpu 0 */ 208 for (irq = 0; irq < sc->sc_nirq; irq++) 209 openpic_write(sc, OPENPIC_IDEST(irq), 1 << 0); 210 211 /* clear all pending interrupts from cpu 0 */ 212 for (irq = 0; irq < sc->sc_nirq; irq++) { 213 (void)openpic_read(sc, OPENPIC_PCPU_IACK(0)); 214 openpic_write(sc, OPENPIC_PCPU_EOI(0), 0); 215 } 216 217 for (cpu = 0; cpu < sc->sc_ncpu; cpu++) 218 openpic_write(sc, OPENPIC_PCPU_TPR(cpu), 0); 219 220 powerpc_register_pic(dev, sc->sc_nirq); 221 222 /* If this is not a cascaded PIC, it must be the root PIC */ 223 if (sc->sc_intr == NULL) 224 root_pic = dev; 225 226 return (0); 227 } 228 229 /* 230 * PIC I/F methods 231 */ 232 233 void 234 openpic_bind(device_t dev, u_int irq, cpumask_t cpumask) 235 { 236 struct openpic_softc *sc; 237 238 /* If we aren't directly connected to the CPU, this won't work */ 239 if (dev != root_pic) 240 return; 241 242 sc = device_get_softc(dev); 243 openpic_write(sc, OPENPIC_IDEST(irq), cpumask); 244 } 245 246 void 247 openpic_config(device_t dev, u_int irq, enum intr_trigger trig, 248 enum intr_polarity pol) 249 { 250 struct openpic_softc *sc; 251 uint32_t x; 252 253 sc = device_get_softc(dev); 254 x = openpic_read(sc, OPENPIC_SRC_VECTOR(irq)); 255 if (pol == INTR_POLARITY_LOW) 256 x &= ~OPENPIC_POLARITY_POSITIVE; 257 else 258 x |= OPENPIC_POLARITY_POSITIVE; 259 if (trig == INTR_TRIGGER_EDGE) 260 x &= ~OPENPIC_SENSE_LEVEL; 261 else 262 x |= OPENPIC_SENSE_LEVEL; 263 openpic_write(sc, OPENPIC_SRC_VECTOR(irq), x); 264 } 265 266 static int 267 openpic_intr(void *arg) 268 { 269 device_t dev = (device_t)(arg); 270 271 /* XXX Cascaded PICs do not pass non-NULL trapframes! */ 272 openpic_dispatch(dev, NULL); 273 274 return (FILTER_HANDLED); 275 } 276 277 void 278 openpic_dispatch(device_t dev, struct trapframe *tf) 279 { 280 struct openpic_softc *sc; 281 u_int cpuid, vector; 282 283 CTR1(KTR_INTR, "%s: got interrupt", __func__); 284 285 cpuid = (dev == root_pic) ? PCPU_GET(cpuid) : 0; 286 287 sc = device_get_softc(dev); 288 289 while (1) { 290 vector = openpic_read(sc, OPENPIC_PCPU_IACK(cpuid)); 291 vector &= OPENPIC_VECTOR_MASK; 292 if (vector == 255) 293 break; 294 powerpc_dispatch_intr(vector, tf); 295 } 296 } 297 298 void 299 openpic_enable(device_t dev, u_int irq, u_int vector) 300 { 301 struct openpic_softc *sc; 302 uint32_t x; 303 304 sc = device_get_softc(dev); 305 if (irq < sc->sc_nirq) { 306 x = openpic_read(sc, OPENPIC_SRC_VECTOR(irq)); 307 x &= ~(OPENPIC_IMASK | OPENPIC_VECTOR_MASK); 308 x |= vector; 309 openpic_write(sc, OPENPIC_SRC_VECTOR(irq), x); 310 } else { 311 x = openpic_read(sc, OPENPIC_IPI_VECTOR(0)); 312 x &= ~(OPENPIC_IMASK | OPENPIC_VECTOR_MASK); 313 x |= vector; 314 openpic_write(sc, OPENPIC_IPI_VECTOR(0), x); 315 } 316 } 317 318 void 319 openpic_eoi(device_t dev, u_int irq __unused) 320 { 321 struct openpic_softc *sc; 322 u_int cpuid; 323 324 cpuid = (dev == root_pic) ? PCPU_GET(cpuid) : 0; 325 326 sc = device_get_softc(dev); 327 openpic_write(sc, OPENPIC_PCPU_EOI(cpuid), 0); 328 } 329 330 void 331 openpic_ipi(device_t dev, u_int cpu) 332 { 333 struct openpic_softc *sc; 334 335 KASSERT(dev == root_pic, ("Cannot send IPIs from non-root OpenPIC")); 336 337 sc = device_get_softc(dev); 338 sched_pin(); 339 openpic_write(sc, OPENPIC_PCPU_IPI_DISPATCH(PCPU_GET(cpuid), 0), 340 1u << cpu); 341 sched_unpin(); 342 } 343 344 void 345 openpic_mask(device_t dev, u_int irq) 346 { 347 struct openpic_softc *sc; 348 uint32_t x; 349 350 sc = device_get_softc(dev); 351 if (irq < sc->sc_nirq) { 352 x = openpic_read(sc, OPENPIC_SRC_VECTOR(irq)); 353 x |= OPENPIC_IMASK; 354 openpic_write(sc, OPENPIC_SRC_VECTOR(irq), x); 355 } else { 356 x = openpic_read(sc, OPENPIC_IPI_VECTOR(0)); 357 x |= OPENPIC_IMASK; 358 openpic_write(sc, OPENPIC_IPI_VECTOR(0), x); 359 } 360 } 361 362 void 363 openpic_unmask(device_t dev, u_int irq) 364 { 365 struct openpic_softc *sc; 366 uint32_t x; 367 368 sc = device_get_softc(dev); 369 if (irq < sc->sc_nirq) { 370 x = openpic_read(sc, OPENPIC_SRC_VECTOR(irq)); 371 x &= ~OPENPIC_IMASK; 372 openpic_write(sc, OPENPIC_SRC_VECTOR(irq), x); 373 } else { 374 x = openpic_read(sc, OPENPIC_IPI_VECTOR(0)); 375 x &= ~OPENPIC_IMASK; 376 openpic_write(sc, OPENPIC_IPI_VECTOR(0), x); 377 } 378 } 379