1 /* $NetBSD: iomd_irqhandler.c,v 1.22 2014/10/25 10:58:12 skrll Exp $ */ 2 3 /* 4 * Copyright (c) 1994-1998 Mark Brinicombe. 5 * Copyright (c) 1994 Brini. 6 * All rights reserved. 7 * 8 * This code is derived from software written for Brini by Mark Brinicombe 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Mark Brinicombe 21 * for the NetBSD Project. 22 * 4. The name of the company nor the name of the author may be used to 23 * endorse or promote products derived from this software without specific 24 * prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 27 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 28 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 29 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 30 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 31 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 35 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 36 * 37 * IRQ/FIQ initialisation, claim, release and handler routines 38 * 39 * from: irqhandler.c,v 1.14 1997/04/02 21:52:19 christos Exp $ 40 */ 41 42 #include <sys/cdefs.h> 43 __KERNEL_RCSID(0, "$NetBSD: iomd_irqhandler.c,v 1.22 2014/10/25 10:58:12 skrll Exp $"); 44 45 #include "opt_irqstats.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/syslog.h> 50 #include <sys/malloc.h> 51 52 #include <arm/cpufunc.h> 53 #include <arm/iomd/iomdreg.h> 54 #include <arm/iomd/iomdvar.h> 55 56 #include <machine/intr.h> 57 #include <machine/cpu.h> 58 59 irqhandler_t *irqhandlers[NIRQS]; 60 61 u_int current_mask; 62 u_int actual_mask; 63 u_int disabled_mask; 64 u_int irqmasks[NIPL]; 65 66 extern char *_intrnames; 67 68 /* Prototypes */ 69 70 extern void set_spl_masks(void); 71 72 /* 73 * void irq_init(void) 74 * 75 * Initialise the IRQ/FIQ sub system 76 */ 77 78 void 79 irq_init(void) 80 { 81 int loop; 82 83 /* Clear all the IRQ handlers and the irq block masks */ 84 for (loop = 0; loop < NIRQS; ++loop) 85 irqhandlers[loop] = NULL; 86 87 /* Clear the IRQ/FIQ masks in the IOMD */ 88 IOMD_WRITE_BYTE(IOMD_IRQMSKA, 0x00); 89 IOMD_WRITE_BYTE(IOMD_IRQMSKB, 0x00); 90 91 switch (IOMD_ID) { 92 case RPC600_IOMD_ID: 93 break; 94 case ARM7500_IOC_ID: 95 case ARM7500FE_IOC_ID: 96 IOMD_WRITE_BYTE(IOMD_IRQMSKC, 0x00); 97 IOMD_WRITE_BYTE(IOMD_IRQMSKD, 0x00); 98 break; 99 default: 100 printf("Unknown IOMD id (%d) found in irq_init()\n", IOMD_ID); 101 } 102 103 IOMD_WRITE_BYTE(IOMD_FIQMSK, 0x00); 104 IOMD_WRITE_BYTE(IOMD_DMAMSK, 0x00); 105 106 /* 107 * Setup the irqmasks for the different Interrupt Priority Levels 108 * We will start with no bits set and these will be updated as handlers 109 * are installed at different IPL's. 110 */ 111 for (loop = 0; loop < NIPL; ++loop) 112 irqmasks[loop] = 0; 113 114 current_mask = 0x00000000; 115 disabled_mask = 0x00000000; 116 actual_mask = 0x00000000; 117 118 set_spl_masks(); 119 120 /* Enable IRQ's and FIQ's */ 121 enable_interrupts(I32_bit | F32_bit); 122 } 123 124 125 /* 126 * int irq_claim(int irq, irqhandler_t *handler) 127 * 128 * Enable an IRQ and install a handler for it. 129 */ 130 131 int 132 irq_claim(int irq, irqhandler_t *handler) 133 { 134 int level; 135 u_int oldirqstate; 136 137 #ifdef DIAGNOSTIC 138 /* Sanity check */ 139 if (handler == NULL) 140 panic("NULL interrupt handler"); 141 if (handler->ih_func == NULL) 142 panic("Interrupt handler does not have a function"); 143 #endif /* DIAGNOSTIC */ 144 145 /* 146 * IRQ_INSTRUCT indicates that we should get the irq number 147 * from the irq structure 148 */ 149 if (irq == IRQ_INSTRUCT) 150 irq = handler->ih_num; 151 152 /* Make sure the irq number is valid */ 153 if (irq < 0 || irq >= NIRQS) 154 return -1; 155 156 /* Make sure the level is valid */ 157 if (handler->ih_level < 0 || handler->ih_level >= NIPL) 158 return -1; 159 160 oldirqstate = disable_interrupts(I32_bit); 161 162 /* Attach handler at top of chain */ 163 handler->ih_next = irqhandlers[irq]; 164 irqhandlers[irq] = handler; 165 166 /* 167 * Reset the flags for this handler. 168 * As the handler is now in the chain mark it as active. 169 */ 170 handler->ih_flags = 0 | IRQ_FLAG_ACTIVE; 171 172 /* 173 * Record the interrupt number for accounting. 174 * Done here as the accounting number may not be the same as the 175 * IRQ number though for the moment they are 176 */ 177 handler->ih_num = irq; 178 179 #ifdef IRQSTATS 180 /* Get the interrupt name from the head of the list */ 181 char *iptr = _intrnames + (irq * 14); 182 if (handler->ih_name) { 183 strlcpy(iptr, handler->ih_name, 14); 184 } else { 185 snprintf(iptr, 14, "irq %2d ", irq); 186 } 187 #endif /* IRQSTATS */ 188 189 /* 190 * Update the irq masks. 191 * Find the lowest interrupt priority on the irq chain. 192 * Interrupt is allowable at priorities lower than this. 193 * If ih_level is out of range then don't bother to update 194 * the masks. 195 */ 196 if (handler->ih_level >= 0 && handler->ih_level < NIPL) { 197 irqhandler_t *ptr; 198 199 /* 200 * Find the lowest interrupt priority on the irq chain. 201 * Interrupt is allowable at priorities lower than this. 202 */ 203 ptr = irqhandlers[irq]; 204 if (ptr) { 205 int max_level; 206 207 level = ptr->ih_level - 1; 208 max_level = ptr->ih_level - 1; 209 while (ptr) { 210 if (ptr->ih_level - 1 < level) 211 level = ptr->ih_level - 1; 212 else if (ptr->ih_level - 1 > max_level) 213 max_level = ptr->ih_level - 1; 214 ptr = ptr->ih_next; 215 } 216 /* Clear out any levels that we cannot now allow */ 217 while (max_level >=0 && max_level > level) { 218 irqmasks[max_level] &= ~(1 << irq); 219 --max_level; 220 } 221 while (level >= 0) { 222 irqmasks[level] |= (1 << irq); 223 --level; 224 } 225 } 226 227 #include "sl.h" 228 #include "ppp.h" 229 #if NSL > 0 || NPPP > 0 230 /* In the presence of SLIP or PPP, splimp > spltty. */ 231 irqmasks[IPL_NET] &= irqmasks[IPL_TTY]; 232 #endif 233 } 234 235 enable_irq(irq); 236 set_spl_masks(); 237 restore_interrupts(oldirqstate); 238 239 return 0; 240 } 241 242 243 /* 244 * int irq_release(int irq, irqhandler_t *handler) 245 * 246 * Disable an IRQ and remove a handler for it. 247 */ 248 249 int 250 irq_release(int irq, irqhandler_t *handler) 251 { 252 int level; 253 irqhandler_t *irqhand; 254 irqhandler_t **prehand; 255 256 /* 257 * IRQ_INSTRUCT indicates that we should get the irq number 258 * from the irq structure 259 */ 260 if (irq == IRQ_INSTRUCT) 261 irq = handler->ih_num; 262 263 /* Make sure the irq number is valid */ 264 if (irq < 0 || irq >= NIRQS) 265 return(-1); 266 267 /* Locate the handler */ 268 irqhand = irqhandlers[irq]; 269 prehand = &irqhandlers[irq]; 270 271 while (irqhand && handler != irqhand) { 272 prehand = &irqhand->ih_next; 273 irqhand = irqhand->ih_next; 274 } 275 276 /* Remove the handler if located */ 277 if (irqhand) 278 *prehand = irqhand->ih_next; 279 else 280 return -1; 281 282 /* Now the handler has been removed from the chain mark is as inactive */ 283 irqhand->ih_flags &= ~IRQ_FLAG_ACTIVE; 284 285 /* Make sure the head of the handler list is active */ 286 if (irqhandlers[irq]) 287 irqhandlers[irq]->ih_flags |= IRQ_FLAG_ACTIVE; 288 289 #ifdef IRQSTATS 290 /* Get the interrupt name from the head of the list */ 291 char *iptr = _intrnames + (irq * 14); 292 if (irqhandlers[irq] && irqhandlers[irq]->ih_name) { 293 strlcpy(iptr, irqhandlers[irq]->ih_name, 14); 294 } else { 295 snprintf(iptr, 14, "irq %2d ", irq); 296 } 297 #endif /* IRQSTATS */ 298 299 /* 300 * Update the irq masks. 301 * If ih_level is out of range then don't bother to update 302 * the masks. 303 */ 304 if (handler->ih_level >= 0 && handler->ih_level < NIPL) { 305 irqhandler_t *ptr; 306 307 /* Clean the bit from all the masks */ 308 for (level = 0; level < NIPL; ++level) 309 irqmasks[level] &= ~(1 << irq); 310 311 /* 312 * Find the lowest interrupt priority on the irq chain. 313 * Interrupt is allowable at priorities lower than this. 314 */ 315 ptr = irqhandlers[irq]; 316 if (ptr) { 317 level = ptr->ih_level - 1; 318 while (ptr) { 319 if (ptr->ih_level - 1 < level) 320 level = ptr->ih_level - 1; 321 ptr = ptr->ih_next; 322 } 323 while (level >= 0) { 324 irqmasks[level] |= (1 << irq); 325 --level; 326 } 327 } 328 } 329 330 /* 331 * Disable the appropriate mask bit if there are no handlers left for 332 * this IRQ. 333 */ 334 if (irqhandlers[irq] == NULL) 335 disable_irq(irq); 336 337 set_spl_masks(); 338 339 return 0; 340 } 341 342 343 void * 344 intr_claim(int irq, int level, const char *name, int (*ih_func)(void *), 345 void *ih_arg) 346 { 347 irqhandler_t *ih; 348 349 ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT); 350 if (!ih) 351 panic("intr_claim(): Cannot malloc handler memory"); 352 353 ih->ih_level = level; 354 ih->ih_name = name; 355 ih->ih_func = ih_func; 356 ih->ih_arg = ih_arg; 357 ih->ih_flags = 0; 358 359 if (irq_claim(irq, ih) != 0) { 360 free(ih, M_DEVBUF); 361 return NULL; 362 } 363 return ih; 364 } 365 366 367 int 368 intr_release(void *arg) 369 { 370 irqhandler_t *ih = (irqhandler_t *)arg; 371 372 if (irq_release(ih->ih_num, ih) == 0) { 373 free(ih, M_DEVBUF); 374 return 0 ; 375 } 376 return 1; 377 } 378 379 #if 0 380 u_int 381 disable_interrupts(u_int mask) 382 { 383 u_int cpsr; 384 385 cpsr = SetCPSR(mask, mask); 386 return cpsr; 387 } 388 389 390 u_int 391 restore_interrupts(u_int old_cpsr) 392 { 393 int mask = I32_bit | F32_bit; 394 395 return SetCPSR(mask, old_cpsr & mask); 396 } 397 398 399 u_int 400 enable_interrupts(u_int mask) 401 { 402 403 return SetCPSR(mask, 0); 404 } 405 #endif 406 407 /* 408 * void disable_irq(int irq) 409 * 410 * Disables a specific irq. The irq is removed from the master irq mask 411 */ 412 413 void 414 disable_irq(int irq) 415 { 416 u_int oldirqstate; 417 418 oldirqstate = disable_interrupts(I32_bit); 419 current_mask &= ~(1 << irq); 420 irq_setmasks(); 421 restore_interrupts(oldirqstate); 422 } 423 424 425 /* 426 * void enable_irq(int irq) 427 * 428 * Enables a specific irq. The irq is added to the master irq mask 429 * This routine should be used with caution. A handler should already 430 * be installed. 431 */ 432 433 void 434 enable_irq(int irq) 435 { 436 u_int oldirqstate; 437 438 oldirqstate = disable_interrupts(I32_bit); 439 current_mask |= (1 << irq); 440 irq_setmasks(); 441 restore_interrupts(oldirqstate); 442 } 443 444 445 /* 446 * void stray_irqhandler(u_int mask) 447 * 448 * Handler for stray interrupts. This gets called if a handler cannot be 449 * found for an interrupt. 450 */ 451 452 void 453 stray_irqhandler(u_int mask) 454 { 455 static u_int stray_irqs = 0; 456 457 if (++stray_irqs <= 8) 458 log(LOG_ERR, "Stray interrupt %08x%s\n", mask, 459 stray_irqs >= 8 ? ": stopped logging" : ""); 460 } 461