iq80310_intr.c revision 1.21
1 /* $NetBSD: iq80310_intr.c,v 1.21 2005/08/14 19:23:17 he 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 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: iq80310_intr.c,v 1.21 2005/08/14 19:23:17 he Exp $"); 40 41 #ifndef EVBARM_SPL_NOINLINE 42 #define EVBARM_SPL_NOINLINE 43 #endif 44 45 /* 46 * Interrupt support for the Intel IQ80310. 47 */ 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/malloc.h> 52 53 #include <uvm/uvm_extern.h> 54 55 #include <machine/bus.h> 56 #include <machine/intr.h> 57 58 #include <arm/cpufunc.h> 59 60 #include <arm/xscale/i80200reg.h> 61 #include <arm/xscale/i80200var.h> 62 63 #include <evbarm/iq80310/iq80310reg.h> 64 #include <evbarm/iq80310/iq80310var.h> 65 #include <evbarm/iq80310/obiovar.h> 66 67 /* Interrupt handler queues. */ 68 struct intrq intrq[NIRQ]; 69 70 /* Interrupts to mask at each level. */ 71 int iq80310_imask[NIPL]; 72 73 /* Current interrupt priority level. */ 74 __volatile int current_spl_level; 75 76 /* Interrupts pending. */ 77 __volatile int iq80310_ipending; 78 79 /* Software copy of the IRQs we have enabled. */ 80 uint32_t intr_enabled; 81 82 /* 83 * Map a software interrupt queue index (at the top of the word, and 84 * highest priority softintr is encountered first in an ffs()). 85 */ 86 #define SI_TO_IRQBIT(si) (1U << (31 - (si))) 87 88 /* 89 * Map a software interrupt queue to an interrupt priority level. 90 */ 91 static const int si_to_ipl[SI_NQUEUES] = { 92 IPL_SOFT, /* SI_SOFT */ 93 IPL_SOFTCLOCK, /* SI_SOFTCLOCK */ 94 IPL_SOFTNET, /* SI_SOFTNET */ 95 IPL_SOFTSERIAL, /* SI_SOFTSERIAL */ 96 }; 97 98 void iq80310_intr_dispatch(struct irqframe *frame); 99 100 static __inline uint32_t 101 iq80310_intstat_read(void) 102 { 103 uint32_t intstat; 104 105 intstat = CPLD_READ(IQ80310_XINT3_STATUS) & 0x1f; 106 #if defined(IRQ_READ_XINT0) 107 if (IRQ_READ_XINT0) 108 intstat |= (CPLD_READ(IQ80310_XINT0_STATUS) & 0x7) << 5; 109 #endif 110 111 /* XXX Why do we have to mask off? */ 112 return (intstat & intr_enabled); 113 } 114 115 static __inline void 116 iq80310_set_intrmask(void) 117 { 118 uint32_t disabled; 119 120 intr_enabled |= IRQ_BITS_ALWAYS_ON; 121 122 /* The XINT_MASK register sets a bit to *disable*. */ 123 disabled = (~intr_enabled) & IRQ_BITS; 124 125 CPLD_WRITE(IQ80310_XINT_MASK, disabled & 0x1f); 126 } 127 128 static __inline void 129 iq80310_enable_irq(int irq) 130 { 131 132 intr_enabled |= (1U << irq); 133 iq80310_set_intrmask(); 134 } 135 136 static __inline void 137 iq80310_disable_irq(int irq) 138 { 139 140 intr_enabled &= ~(1U << irq); 141 iq80310_set_intrmask(); 142 } 143 144 /* 145 * NOTE: This routine must be called with interrupts disabled in the CPSR. 146 */ 147 static void 148 iq80310_intr_calculate_masks(void) 149 { 150 struct intrq *iq; 151 struct intrhand *ih; 152 int irq, ipl; 153 154 /* First, figure out which IPLs each IRQ has. */ 155 for (irq = 0; irq < NIRQ; irq++) { 156 int levels = 0; 157 iq = &intrq[irq]; 158 iq80310_disable_irq(irq); 159 for (ih = TAILQ_FIRST(&iq->iq_list); ih != NULL; 160 ih = TAILQ_NEXT(ih, ih_list)) 161 levels |= (1U << ih->ih_ipl); 162 iq->iq_levels = levels; 163 } 164 165 /* Next, figure out which IRQs are used by each IPL. */ 166 for (ipl = 0; ipl < NIPL; ipl++) { 167 int irqs = 0; 168 for (irq = 0; irq < NIRQ; irq++) { 169 if (intrq[irq].iq_levels & (1U << ipl)) 170 irqs |= (1U << irq); 171 } 172 iq80310_imask[ipl] = irqs; 173 } 174 175 iq80310_imask[IPL_NONE] = 0; 176 177 /* 178 * Initialize the soft interrupt masks to block themselves. 179 */ 180 iq80310_imask[IPL_SOFT] = SI_TO_IRQBIT(SI_SOFT); 181 iq80310_imask[IPL_SOFTCLOCK] = SI_TO_IRQBIT(SI_SOFTCLOCK); 182 iq80310_imask[IPL_SOFTNET] = SI_TO_IRQBIT(SI_SOFTNET); 183 iq80310_imask[IPL_SOFTSERIAL] = SI_TO_IRQBIT(SI_SOFTSERIAL); 184 185 /* 186 * splsoftclock() is the only interface that users of the 187 * generic software interrupt facility have to block their 188 * soft intrs, so splsoftclock() must also block IPL_SOFT. 189 */ 190 iq80310_imask[IPL_SOFTCLOCK] |= iq80310_imask[IPL_SOFT]; 191 192 /* 193 * splsoftnet() must also block splsoftclock(), since we don't 194 * want timer-driven network events to occur while we're 195 * processing incoming packets. 196 */ 197 iq80310_imask[IPL_SOFTNET] |= iq80310_imask[IPL_SOFTCLOCK]; 198 199 /* 200 * Enforce a heirarchy that gives "slow" device (or devices with 201 * limited input buffer space/"real-time" requirements) a better 202 * chance at not dropping data. 203 */ 204 iq80310_imask[IPL_BIO] |= iq80310_imask[IPL_SOFTNET]; 205 iq80310_imask[IPL_NET] |= iq80310_imask[IPL_BIO]; 206 iq80310_imask[IPL_SOFTSERIAL] |= iq80310_imask[IPL_NET]; 207 iq80310_imask[IPL_TTY] |= iq80310_imask[IPL_SOFTSERIAL]; 208 209 /* 210 * splvm() blocks all interrupts that use the kernel memory 211 * allocation facilities. 212 */ 213 iq80310_imask[IPL_VM] |= iq80310_imask[IPL_TTY]; 214 215 /* 216 * Audio devices are not allowed to perform memory allocation 217 * in their interrupt routines, and they have fairly "real-time" 218 * requirements, so give them a high interrupt priority. 219 */ 220 iq80310_imask[IPL_AUDIO] |= iq80310_imask[IPL_VM]; 221 222 /* 223 * splclock() must block anything that uses the scheduler. 224 */ 225 iq80310_imask[IPL_CLOCK] |= iq80310_imask[IPL_AUDIO]; 226 227 /* 228 * No separate statclock on the IQ80310. 229 */ 230 iq80310_imask[IPL_STATCLOCK] |= iq80310_imask[IPL_CLOCK]; 231 232 /* 233 * splhigh() must block "everything". 234 */ 235 iq80310_imask[IPL_HIGH] |= iq80310_imask[IPL_STATCLOCK]; 236 237 /* 238 * XXX We need serial drivers to run at the absolute highest priority 239 * in order to avoid overruns, so serial > high. 240 */ 241 iq80310_imask[IPL_SERIAL] |= iq80310_imask[IPL_HIGH]; 242 243 /* 244 * Now compute which IRQs must be blocked when servicing any 245 * given IRQ. 246 */ 247 for (irq = 0; irq < NIRQ; irq++) { 248 int irqs = (1U << irq); 249 iq = &intrq[irq]; 250 if (TAILQ_FIRST(&iq->iq_list) != NULL) 251 iq80310_enable_irq(irq); 252 for (ih = TAILQ_FIRST(&iq->iq_list); ih != NULL; 253 ih = TAILQ_NEXT(ih, ih_list)) 254 irqs |= iq80310_imask[ih->ih_ipl]; 255 iq->iq_mask = irqs; 256 } 257 } 258 259 void 260 iq80310_do_soft(void) 261 { 262 static __cpu_simple_lock_t processing = __SIMPLELOCK_UNLOCKED; 263 int new, oldirqstate; 264 265 if (__cpu_simple_lock_try(&processing) == 0) 266 return; 267 268 new = current_spl_level; 269 270 oldirqstate = disable_interrupts(I32_bit); 271 272 #define DO_SOFTINT(si) \ 273 if ((iq80310_ipending & ~new) & SI_TO_IRQBIT(si)) { \ 274 iq80310_ipending &= ~SI_TO_IRQBIT(si); \ 275 current_spl_level |= iq80310_imask[si_to_ipl[(si)]]; \ 276 restore_interrupts(oldirqstate); \ 277 softintr_dispatch(si); \ 278 oldirqstate = disable_interrupts(I32_bit); \ 279 current_spl_level = new; \ 280 } 281 282 DO_SOFTINT(SI_SOFTSERIAL); 283 DO_SOFTINT(SI_SOFTNET); 284 DO_SOFTINT(SI_SOFTCLOCK); 285 DO_SOFTINT(SI_SOFT); 286 287 __cpu_simple_unlock(&processing); 288 289 restore_interrupts(oldirqstate); 290 } 291 292 int 293 _splraise(int ipl) 294 { 295 296 return (iq80310_splraise(ipl)); 297 } 298 299 __inline void 300 splx(int new) 301 { 302 303 return (iq80310_splx(new)); 304 } 305 306 int 307 _spllower(int ipl) 308 { 309 310 return (iq80310_spllower(ipl)); 311 } 312 313 void 314 _setsoftintr(int si) 315 { 316 int oldirqstate; 317 318 oldirqstate = disable_interrupts(I32_bit); 319 iq80310_ipending |= SI_TO_IRQBIT(si); 320 restore_interrupts(oldirqstate); 321 322 /* Process unmasked pending soft interrupts. */ 323 if ((iq80310_ipending & ~IRQ_BITS) & ~current_spl_level) 324 iq80310_do_soft(); 325 } 326 327 void 328 iq80310_intr_init(void) 329 { 330 struct intrq *iq; 331 int i; 332 333 /* 334 * The Secondary PCI interrupts INTA, INTB, and INTC 335 * area always enabled, since they cannot be masked 336 * in the CPLD. 337 */ 338 intr_enabled |= IRQ_BITS_ALWAYS_ON; 339 340 for (i = 0; i < NIRQ; i++) { 341 iq = &intrq[i]; 342 TAILQ_INIT(&iq->iq_list); 343 344 sprintf(iq->iq_name, "irq %d", i); 345 evcnt_attach_dynamic(&iq->iq_ev, EVCNT_TYPE_INTR, 346 NULL, "iq80310", iq->iq_name); 347 } 348 349 iq80310_intr_calculate_masks(); 350 351 /* Enable external interrupts on the i80200. */ 352 i80200_extirq_dispatch = iq80310_intr_dispatch; 353 i80200_intr_enable(INTCTL_IM | INTCTL_PM); 354 355 /* Enable IRQs (don't yet use FIQs). */ 356 enable_interrupts(I32_bit); 357 } 358 359 void * 360 iq80310_intr_establish(int irq, int ipl, int (*func)(void *), void *arg) 361 { 362 struct intrq *iq; 363 struct intrhand *ih; 364 u_int oldirqstate; 365 366 if (irq < 0 || irq > NIRQ) 367 panic("iq80310_intr_establish: IRQ %d out of range", irq); 368 369 ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT); 370 if (ih == NULL) 371 return (NULL); 372 373 ih->ih_func = func; 374 ih->ih_arg = arg; 375 ih->ih_ipl = ipl; 376 ih->ih_irq = irq; 377 378 iq = &intrq[irq]; 379 380 /* All IQ80310 interrupts are level-triggered. */ 381 iq->iq_ist = IST_LEVEL; 382 383 oldirqstate = disable_interrupts(I32_bit); 384 385 TAILQ_INSERT_TAIL(&iq->iq_list, ih, ih_list); 386 387 iq80310_intr_calculate_masks(); 388 389 restore_interrupts(oldirqstate); 390 391 return (ih); 392 } 393 394 void 395 iq80310_intr_disestablish(void *cookie) 396 { 397 struct intrhand *ih = cookie; 398 struct intrq *iq = &intrq[ih->ih_irq]; 399 int oldirqstate; 400 401 oldirqstate = disable_interrupts(I32_bit); 402 403 TAILQ_REMOVE(&iq->iq_list, ih, ih_list); 404 405 iq80310_intr_calculate_masks(); 406 407 restore_interrupts(oldirqstate); 408 } 409 410 void 411 iq80310_intr_dispatch(struct irqframe *frame) 412 { 413 struct intrq *iq; 414 struct intrhand *ih; 415 int oldirqstate, pcpl, irq, ibit, hwpend, rv, stray; 416 417 stray = 1; 418 419 /* First, disable external IRQs. */ 420 i80200_intr_disable(INTCTL_IM | INTCTL_PM); 421 422 pcpl = current_spl_level; 423 424 for (hwpend = iq80310_intstat_read(); hwpend != 0;) { 425 irq = ffs(hwpend) - 1; 426 ibit = (1U << irq); 427 428 stray = 0; 429 430 hwpend &= ~ibit; 431 432 if (pcpl & ibit) { 433 /* 434 * IRQ is masked; mark it as pending and check 435 * the next one. Note: external IRQs are already 436 * disabled. 437 */ 438 iq80310_ipending |= ibit; 439 continue; 440 } 441 442 iq80310_ipending &= ~ibit; 443 rv = 0; 444 445 iq = &intrq[irq]; 446 iq->iq_ev.ev_count++; 447 uvmexp.intrs++; 448 current_spl_level |= iq->iq_mask; 449 oldirqstate = enable_interrupts(I32_bit); 450 for (ih = TAILQ_FIRST(&iq->iq_list); ih != NULL; 451 ih = TAILQ_NEXT(ih, ih_list)) { 452 rv |= (*ih->ih_func)(ih->ih_arg ? ih->ih_arg : frame); 453 } 454 restore_interrupts(oldirqstate); 455 456 current_spl_level = pcpl; 457 458 #if 0 /* XXX */ 459 if (rv == 0) 460 printf("Stray interrupt: IRQ %d\n", irq); 461 #endif 462 } 463 464 #if 0 /* XXX */ 465 if (stray) 466 printf("Stray external interrupt\n"); 467 #endif 468 469 /* Check for pendings soft intrs. */ 470 if ((iq80310_ipending & ~IRQ_BITS) & ~current_spl_level) { 471 oldirqstate = enable_interrupts(I32_bit); 472 iq80310_do_soft(); 473 restore_interrupts(oldirqstate); 474 } 475 476 /* 477 * If no hardware interrupts are masked, re-enable external 478 * interrupts. 479 */ 480 if ((iq80310_ipending & IRQ_BITS) == 0) 481 i80200_intr_enable(INTCTL_IM | INTCTL_PM); 482 } 483
Indexes created Tue Sep 30 17:09:57 GMT 2025