iq80310_intr.c revision 1.16
1 /* $NetBSD: iq80310_intr.c,v 1.16 2002/08/14 19:48:04 thorpej Exp $ */ 2 3 /* 4 * Copyright (c) 2001, 2002 Wasabi Systems, Inc. 5 * All rights reserved. 6 * 7 * Written by Jason R. Thorpe for Wasabi Systems, Inc. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed for the NetBSD Project by 20 * Wasabi Systems, Inc. 21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse 22 * or promote products derived from this software without specific prior 23 * written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC 29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35 * POSSIBILITY OF SUCH DAMAGE. 36 */ 37 38 /* 39 * Interrupt support for the Intel IQ80310. 40 */ 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/malloc.h> 45 46 #include <uvm/uvm_extern.h> 47 48 #include <machine/bus.h> 49 #include <machine/intr.h> 50 51 #include <arm/cpufunc.h> 52 53 #include <arm/xscale/i80200reg.h> 54 #include <arm/xscale/i80200var.h> 55 56 #include <evbarm/iq80310/iq80310reg.h> 57 #include <evbarm/iq80310/iq80310var.h> 58 #include <evbarm/iq80310/obiovar.h> 59 60 #if defined(IOP310_TEAMASA_NPWR) 61 /* 62 * We have 5 interrupt source bits -- all in XINT3. All interrupts 63 * can be masked in the CPLD. 64 */ 65 #define IRQ_BITS 0x1f 66 #define IRQ_BITS_ALWAYS_ON 0x00 67 #else /* Default to stock IQ80310 */ 68 /* 69 * We have 8 interrupt source bits -- 5 in the XINT3 register, and 3 70 * in the XINT0 register (the upper 3). Note that the XINT0 IRQs 71 * (SPCI INTA, INTB, and INTC) are always enabled, since they can not 72 * be masked out in the CPLD (it provides only status, not masking, 73 * for those interrupts). 74 */ 75 #define IRQ_BITS 0xff 76 #define IRQ_BITS_ALWAYS_ON 0xe0 77 #define IRQ_READ_XINT0 1 /* XXX only if board rev >= F */ 78 #endif /* list of IQ80310-based designs */ 79 80 /* Interrupt handler queues. */ 81 struct intrq intrq[NIRQ]; 82 83 /* Interrupts to mask at each level. */ 84 static int imask[NIPL]; 85 86 /* Current interrupt priority level. */ 87 __volatile int current_spl_level; 88 89 /* Interrupts pending. */ 90 static __volatile int ipending; 91 92 /* Software copy of the IRQs we have enabled. */ 93 uint32_t intr_enabled; 94 95 /* 96 * Map a software interrupt queue index (at the top of the word, and 97 * highest priority softintr is encountered first in an ffs()). 98 */ 99 #define SI_TO_IRQBIT(si) (1U << (31 - (si))) 100 101 /* 102 * Map a software interrupt queue to an interrupt priority level. 103 */ 104 static const int si_to_ipl[SI_NQUEUES] = { 105 IPL_SOFT, /* SI_SOFT */ 106 IPL_SOFTCLOCK, /* SI_SOFTCLOCK */ 107 IPL_SOFTNET, /* SI_SOFTNET */ 108 IPL_SOFTSERIAL, /* SI_SOFTSERIAL */ 109 }; 110 111 void iq80310_intr_dispatch(struct clockframe *frame); 112 113 static __inline uint32_t 114 iq80310_intstat_read(void) 115 { 116 uint32_t intstat; 117 118 intstat = CPLD_READ(IQ80310_XINT3_STATUS) & 0x1f; 119 #if defined(IRQ_READ_XINT0) 120 if (IRQ_READ_XINT0) 121 intstat |= (CPLD_READ(IQ80310_XINT0_STATUS) & 0x7) << 5; 122 #endif 123 124 /* XXX Why do we have to mask off? */ 125 return (intstat & intr_enabled); 126 } 127 128 static __inline void 129 iq80310_set_intrmask(void) 130 { 131 uint32_t disabled; 132 133 intr_enabled |= IRQ_BITS_ALWAYS_ON; 134 135 /* The XINT_MASK register sets a bit to *disable*. */ 136 disabled = (~intr_enabled) & IRQ_BITS; 137 138 CPLD_WRITE(IQ80310_XINT_MASK, disabled & 0x1f); 139 } 140 141 static __inline void 142 iq80310_enable_irq(int irq) 143 { 144 145 intr_enabled |= (1U << irq); 146 iq80310_set_intrmask(); 147 } 148 149 static __inline void 150 iq80310_disable_irq(int irq) 151 { 152 153 intr_enabled &= ~(1U << irq); 154 iq80310_set_intrmask(); 155 } 156 157 /* 158 * NOTE: This routine must be called with interrupts disabled in the CPSR. 159 */ 160 static void 161 iq80310_intr_calculate_masks(void) 162 { 163 struct intrq *iq; 164 struct intrhand *ih; 165 int irq, ipl; 166 167 /* First, figure out which IPLs each IRQ has. */ 168 for (irq = 0; irq < NIRQ; irq++) { 169 int levels = 0; 170 iq = &intrq[irq]; 171 iq80310_disable_irq(irq); 172 for (ih = TAILQ_FIRST(&iq->iq_list); ih != NULL; 173 ih = TAILQ_NEXT(ih, ih_list)) 174 levels |= (1U << ih->ih_ipl); 175 iq->iq_levels = levels; 176 } 177 178 /* Next, figure out which IRQs are used by each IPL. */ 179 for (ipl = 0; ipl < NIPL; ipl++) { 180 int irqs = 0; 181 for (irq = 0; irq < NIRQ; irq++) { 182 if (intrq[irq].iq_levels & (1U << ipl)) 183 irqs |= (1U << irq); 184 } 185 imask[ipl] = irqs; 186 } 187 188 imask[IPL_NONE] = 0; 189 190 /* 191 * Initialize the soft interrupt masks to block themselves. 192 */ 193 imask[IPL_SOFT] = SI_TO_IRQBIT(SI_SOFT); 194 imask[IPL_SOFTCLOCK] = SI_TO_IRQBIT(SI_SOFTCLOCK); 195 imask[IPL_SOFTNET] = SI_TO_IRQBIT(SI_SOFTNET); 196 imask[IPL_SOFTSERIAL] = SI_TO_IRQBIT(SI_SOFTSERIAL); 197 198 /* 199 * splsoftclock() is the only interface that users of the 200 * generic software interrupt facility have to block their 201 * soft intrs, so splsoftclock() must also block IPL_SOFT. 202 */ 203 imask[IPL_SOFTCLOCK] |= imask[IPL_SOFT]; 204 205 /* 206 * splsoftnet() must also block splsoftclock(), since we don't 207 * want timer-driven network events to occur while we're 208 * processing incoming packets. 209 */ 210 imask[IPL_SOFTNET] |= imask[IPL_SOFTCLOCK]; 211 212 /* 213 * Enforce a heirarchy that gives "slow" device (or devices with 214 * limited input buffer space/"real-time" requirements) a better 215 * chance at not dropping data. 216 */ 217 imask[IPL_BIO] |= imask[IPL_SOFTNET]; 218 imask[IPL_NET] |= imask[IPL_BIO]; 219 imask[IPL_SOFTSERIAL] |= imask[IPL_NET]; 220 imask[IPL_TTY] |= imask[IPL_SOFTSERIAL]; 221 222 /* 223 * splvm() blocks all interrupts that use the kernel memory 224 * allocation facilities. 225 */ 226 imask[IPL_IMP] |= imask[IPL_TTY]; 227 228 /* 229 * Audio devices are not allowed to perform memory allocation 230 * in their interrupt routines, and they have fairly "real-time" 231 * requirements, so give them a high interrupt priority. 232 */ 233 imask[IPL_AUDIO] |= imask[IPL_IMP]; 234 235 /* 236 * splclock() must block anything that uses the scheduler. 237 */ 238 imask[IPL_CLOCK] |= imask[IPL_AUDIO]; 239 240 /* 241 * No separate statclock on the IQ80310. 242 */ 243 imask[IPL_STATCLOCK] |= imask[IPL_CLOCK]; 244 245 /* 246 * splhigh() must block "everything". 247 */ 248 imask[IPL_HIGH] |= imask[IPL_STATCLOCK]; 249 250 /* 251 * XXX We need serial drivers to run at the absolute highest priority 252 * in order to avoid overruns, so serial > high. 253 */ 254 imask[IPL_SERIAL] |= imask[IPL_HIGH]; 255 256 /* 257 * Now compute which IRQs must be blocked when servicing any 258 * given IRQ. 259 */ 260 for (irq = 0; irq < NIRQ; irq++) { 261 int irqs = (1U << irq); 262 iq = &intrq[irq]; 263 if (TAILQ_FIRST(&iq->iq_list) != NULL) 264 iq80310_enable_irq(irq); 265 for (ih = TAILQ_FIRST(&iq->iq_list); ih != NULL; 266 ih = TAILQ_NEXT(ih, ih_list)) 267 irqs |= imask[ih->ih_ipl]; 268 iq->iq_mask = irqs; 269 } 270 } 271 272 static void 273 iq80310_do_soft(void) 274 { 275 static __cpu_simple_lock_t processing = __SIMPLELOCK_UNLOCKED; 276 int new, oldirqstate; 277 278 if (__cpu_simple_lock_try(&processing) == 0) 279 return; 280 281 new = current_spl_level; 282 283 oldirqstate = disable_interrupts(I32_bit); 284 285 #define DO_SOFTINT(si) \ 286 if ((ipending & ~new) & SI_TO_IRQBIT(si)) { \ 287 ipending &= ~SI_TO_IRQBIT(si); \ 288 current_spl_level |= imask[si_to_ipl[(si)]]; \ 289 restore_interrupts(oldirqstate); \ 290 softintr_dispatch(si); \ 291 oldirqstate = disable_interrupts(I32_bit); \ 292 current_spl_level = new; \ 293 } 294 295 DO_SOFTINT(SI_SOFTSERIAL); 296 DO_SOFTINT(SI_SOFTNET); 297 DO_SOFTINT(SI_SOFTCLOCK); 298 DO_SOFTINT(SI_SOFT); 299 300 __cpu_simple_unlock(&processing); 301 302 restore_interrupts(oldirqstate); 303 } 304 305 int 306 _splraise(int ipl) 307 { 308 int old; 309 310 old = current_spl_level; 311 current_spl_level |= imask[ipl]; 312 313 return (old); 314 } 315 316 __inline void 317 splx(int new) 318 { 319 int old; 320 321 old = current_spl_level; 322 current_spl_level = new; 323 324 /* If there are software interrupts to process, do it. */ 325 if ((ipending & ~IRQ_BITS) & ~new) 326 iq80310_do_soft(); 327 328 /* 329 * If there are pending hardware interrupts (i.e. the 330 * external interrupt is disabled in the ICU), and all 331 * hardware interrupts are being unblocked, then re-enable 332 * the external hardware interrupt. 333 * 334 * XXX We have to wait for ALL hardware interrupts to 335 * XXX be unblocked, because we currently lose if we 336 * XXX get nested interrupts, and I don't know why yet. 337 */ 338 if ((new & IRQ_BITS) == 0 && (ipending & IRQ_BITS)) 339 i80200_intr_enable(INTCTL_IM | INTCTL_PM); 340 } 341 342 int 343 _spllower(int ipl) 344 { 345 int old = current_spl_level; 346 347 splx(imask[ipl]); 348 return (old); 349 } 350 351 void 352 _setsoftintr(int si) 353 { 354 int oldirqstate; 355 356 oldirqstate = disable_interrupts(I32_bit); 357 ipending |= SI_TO_IRQBIT(si); 358 restore_interrupts(oldirqstate); 359 360 /* Process unmasked pending soft interrupts. */ 361 if ((ipending & ~IRQ_BITS) & ~current_spl_level) 362 iq80310_do_soft(); 363 } 364 365 void 366 iq80310_intr_init(void) 367 { 368 struct intrq *iq; 369 int i; 370 371 /* 372 * The Secondary PCI interrupts INTA, INTB, and INTC 373 * area always enabled, since they cannot be masked 374 * in the CPLD. 375 */ 376 intr_enabled |= IRQ_BITS_ALWAYS_ON; 377 378 for (i = 0; i < NIRQ; i++) { 379 iq = &intrq[i]; 380 TAILQ_INIT(&iq->iq_list); 381 382 sprintf(iq->iq_name, "irq %d", i); 383 evcnt_attach_dynamic(&iq->iq_ev, EVCNT_TYPE_INTR, 384 NULL, "iq80310", iq->iq_name); 385 } 386 387 iq80310_intr_calculate_masks(); 388 389 /* Enable external interrupts on the i80200. */ 390 i80200_extirq_dispatch = iq80310_intr_dispatch; 391 i80200_intr_enable(INTCTL_IM | INTCTL_PM); 392 393 /* Enable IRQs (don't yet use FIQs). */ 394 enable_interrupts(I32_bit); 395 } 396 397 void * 398 iq80310_intr_establish(int irq, int ipl, int (*func)(void *), void *arg) 399 { 400 struct intrq *iq; 401 struct intrhand *ih; 402 u_int oldirqstate; 403 404 if (irq < 0 || irq > NIRQ) 405 panic("iq80310_intr_establish: IRQ %d out of range", irq); 406 407 ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT); 408 if (ih == NULL) 409 return (NULL); 410 411 ih->ih_func = func; 412 ih->ih_arg = arg; 413 ih->ih_ipl = ipl; 414 ih->ih_irq = irq; 415 416 iq = &intrq[irq]; 417 418 /* All IQ80310 interrupts are level-triggered. */ 419 iq->iq_ist = IST_LEVEL; 420 421 oldirqstate = disable_interrupts(I32_bit); 422 423 TAILQ_INSERT_TAIL(&iq->iq_list, ih, ih_list); 424 425 iq80310_intr_calculate_masks(); 426 427 restore_interrupts(oldirqstate); 428 429 return (ih); 430 } 431 432 void 433 iq80310_intr_disestablish(void *cookie) 434 { 435 struct intrhand *ih = cookie; 436 struct intrq *iq = &intrq[ih->ih_irq]; 437 int oldirqstate; 438 439 oldirqstate = disable_interrupts(I32_bit); 440 441 TAILQ_REMOVE(&iq->iq_list, ih, ih_list); 442 443 iq80310_intr_calculate_masks(); 444 445 restore_interrupts(oldirqstate); 446 } 447 448 void 449 iq80310_intr_dispatch(struct clockframe *frame) 450 { 451 struct intrq *iq; 452 struct intrhand *ih; 453 int oldirqstate, pcpl, irq, ibit, hwpend, rv, stray; 454 455 stray = 1; 456 457 /* First, disable external IRQs. */ 458 i80200_intr_disable(INTCTL_IM | INTCTL_PM); 459 460 pcpl = current_spl_level; 461 462 for (hwpend = iq80310_intstat_read(); hwpend != 0;) { 463 irq = ffs(hwpend) - 1; 464 ibit = (1U << irq); 465 466 stray = 0; 467 468 hwpend &= ~ibit; 469 470 if (pcpl & ibit) { 471 /* 472 * IRQ is masked; mark it as pending and check 473 * the next one. Note: external IRQs are already 474 * disabled. 475 */ 476 ipending |= ibit; 477 continue; 478 } 479 480 ipending &= ~ibit; 481 rv = 0; 482 483 iq = &intrq[irq]; 484 iq->iq_ev.ev_count++; 485 uvmexp.intrs++; 486 current_spl_level |= iq->iq_mask; 487 oldirqstate = enable_interrupts(I32_bit); 488 for (ih = TAILQ_FIRST(&iq->iq_list); ih != NULL; 489 ih = TAILQ_NEXT(ih, ih_list)) { 490 rv |= (*ih->ih_func)(ih->ih_arg ? ih->ih_arg : frame); 491 } 492 restore_interrupts(oldirqstate); 493 494 current_spl_level = pcpl; 495 496 #if 0 /* XXX */ 497 if (rv == 0) 498 printf("Stray interrupt: IRQ %d\n", irq); 499 #endif 500 } 501 502 #if 0 /* XXX */ 503 if (stray) 504 printf("Stray external interrupt\n"); 505 #endif 506 507 /* Check for pendings soft intrs. */ 508 if ((ipending & ~IRQ_BITS) & ~current_spl_level) { 509 oldirqstate = enable_interrupts(I32_bit); 510 iq80310_do_soft(); 511 restore_interrupts(oldirqstate); 512 } 513 514 /* 515 * If no hardware interrupts are masked, re-enable external 516 * interrupts. 517 */ 518 if ((ipending & IRQ_BITS) == 0) 519 i80200_intr_enable(INTCTL_IM | INTCTL_PM); 520 } 521
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