ofw_irqhandler.c revision 1.7
1 /* $NetBSD: ofw_irqhandler.c,v 1.7 2007/02/18 07:21:32 matt 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 * from: irqhandler.c 38 * 39 * IRQ/FIQ initialisation, claim, release and handler routines 40 * 41 * Created : 30/09/94 42 */ 43 44 #include <sys/cdefs.h> 45 __KERNEL_RCSID(0, "$NetBSD: ofw_irqhandler.c,v 1.7 2007/02/18 07:21:32 matt Exp $"); 46 47 #include "opt_irqstats.h" 48 49 #include <sys/param.h> 50 #include <sys/systm.h> 51 #include <sys/syslog.h> 52 #include <sys/malloc.h> 53 54 #include <uvm/uvm_extern.h> 55 56 #include <machine/intr.h> 57 #include <machine/cpu.h> 58 59 irqhandler_t *irqhandlers[NIRQS]; 60 61 int current_intr_depth; 62 u_int current_mask; 63 u_int actual_mask; 64 u_int disabled_mask; 65 u_int spl_mask; 66 u_int irqmasks[IPL_LEVELS]; 67 extern u_int intrcnt[]; 68 69 extern u_int soft_interrupts; /* Only so we can initialise it */ 70 71 extern char *_intrnames; 72 73 /* Prototypes */ 74 75 int podule_irqhandler __P((void)); 76 extern void set_spl_masks __P((void)); 77 78 /* 79 * void irq_init(void) 80 * 81 * Initialise the IRQ/FIQ sub system 82 */ 83 84 void 85 irq_init() 86 { 87 int loop; 88 89 /* Clear all the IRQ handlers and the irq block masks */ 90 for (loop = 0; loop < NIRQS; ++loop) { 91 irqhandlers[loop] = NULL; 92 } 93 94 /* 95 * Setup the irqmasks for the different Interrupt Priority Levels 96 * We will start with no bits set and these will be updated as handlers 97 * are installed at different IPL's. 98 */ 99 for (loop = 0; loop < IPL_LEVELS; ++loop) 100 irqmasks[loop] = 0; 101 102 current_intr_depth = 0; 103 current_mask = 0x00000000; 104 disabled_mask = 0x00000000; 105 actual_mask = 0x00000000; 106 spl_mask = 0x00000000; 107 soft_interrupts = 0x00000000; 108 softintr_init(); 109 110 set_spl_masks(); 111 112 /* Enable IRQ's and FIQ's */ 113 enable_interrupts(I32_bit | F32_bit); 114 } 115 116 117 /* 118 * int irq_claim(int irq, irqhandler_t *handler) 119 * 120 * Enable an IRQ and install a handler for it. 121 */ 122 123 int 124 irq_claim(irq, handler) 125 int irq; 126 irqhandler_t *handler; 127 { 128 int level; 129 int loop; 130 131 #ifdef DIAGNOSTIC 132 /* Sanity check */ 133 if (handler == NULL) 134 panic("NULL interrupt handler"); 135 if (handler->ih_func == NULL) 136 panic("Interrupt handler does not have a function"); 137 #endif /* DIAGNOSTIC */ 138 139 /* 140 * IRQ_INSTRUCT indicates that we should get the irq number 141 * from the irq structure 142 */ 143 if (irq == IRQ_INSTRUCT) 144 irq = handler->ih_num; 145 146 /* Make sure the irq number is valid */ 147 if (irq < 0 || irq >= NIRQS) 148 return(-1); 149 150 /* Make sure the level is valid */ 151 if (handler->ih_level < 0 || handler->ih_level >= IPL_LEVELS) 152 return(-1); 153 154 /* Attach handler at top of chain */ 155 handler->ih_next = irqhandlers[irq]; 156 irqhandlers[irq] = handler; 157 158 /* 159 * Reset the flags for this handler. 160 * As the handler is now in the chain mark it as active. 161 */ 162 handler->ih_flags = 0 | IRQ_FLAG_ACTIVE; 163 164 /* 165 * Record the interrupt number for accounting. 166 * Done here as the accounting number may not be the same as the 167 * IRQ number though for the moment they are 168 */ 169 handler->ih_num = irq; 170 171 #ifdef IRQSTATS 172 /* Get the interrupt name from the head of the list */ 173 if (handler->ih_name) { 174 char *ptr = _intrnames + (irq * 14); 175 strcpy(ptr, " "); 176 strncpy(ptr, handler->ih_name, 177 min(strlen(handler->ih_name), 13)); 178 } else { 179 char *ptr = _intrnames + (irq * 14); 180 sprintf(ptr, "irq %2d ", irq); 181 } 182 #endif /* IRQSTATS */ 183 184 /* 185 * Update the irq masks. 186 * Find the lowest interrupt priority on the irq chain. 187 * Interrupt is allowable at priorities lower than this. 188 * If ih_level is out of range then don't bother to update 189 * the masks. 190 */ 191 if (handler->ih_level >= 0 && handler->ih_level < IPL_LEVELS) { 192 irqhandler_t *ptr; 193 194 /* 195 * Find the lowest interrupt priority on the irq chain. 196 * Interrupt is allowable at priorities lower than this. 197 */ 198 ptr = irqhandlers[irq]; 199 if (ptr) { 200 level = ptr->ih_level - 1; 201 while (ptr) { 202 if (ptr->ih_level - 1 < level) 203 level = ptr->ih_level - 1; 204 ptr = ptr->ih_next; 205 } 206 while (level >= 0) { 207 irqmasks[level] |= (1 << irq); 208 --level; 209 } 210 } 211 212 #include "sl.h" 213 #include "ppp.h" 214 #if NSL > 0 || NPPP > 0 215 /* In the presence of SLIP or PPP, splimp > spltty. */ 216 irqmasks[IPL_NET] &= irqmasks[IPL_TTY]; 217 #endif 218 } 219 220 enable_irq(irq); 221 set_spl_masks(); 222 223 return(0); 224 } 225 226 227 /* 228 * int irq_release(int irq, irqhandler_t *handler) 229 * 230 * Disable an IRQ and remove a handler for it. 231 */ 232 233 int 234 irq_release(irq, handler) 235 int irq; 236 irqhandler_t *handler; 237 { 238 int level; 239 int loop; 240 irqhandler_t *irqhand; 241 irqhandler_t **prehand; 242 extern char *_intrnames; 243 244 /* 245 * IRQ_INSTRUCT indicates that we should get the irq number 246 * from the irq structure 247 */ 248 if (irq == IRQ_INSTRUCT) 249 irq = handler->ih_num; 250 251 /* Make sure the irq number is valid */ 252 if (irq < 0 || irq >= NIRQS) 253 return(-1); 254 255 /* Locate the handler */ 256 irqhand = irqhandlers[irq]; 257 prehand = &irqhandlers[irq]; 258 259 while (irqhand && handler != irqhand) { 260 prehand = &irqhand; 261 irqhand = irqhand->ih_next; 262 } 263 264 /* Remove the handler if located */ 265 if (irqhand) 266 *prehand = irqhand->ih_next; 267 else 268 return(-1); 269 270 /* Now the handler has been removed from the chain mark is as inactive */ 271 irqhand->ih_flags &= ~IRQ_FLAG_ACTIVE; 272 273 /* Make sure the head of the handler list is active */ 274 if (irqhandlers[irq]) 275 irqhandlers[irq]->ih_flags |= IRQ_FLAG_ACTIVE; 276 277 #ifdef IRQSTATS 278 /* Get the interrupt name from the head of the list */ 279 if (irqhandlers[irq] && irqhandlers[irq]->ih_name) { 280 char *ptr = _intrnames + (irq * 14); 281 strcpy(ptr, " "); 282 strncpy(ptr, irqhandlers[irq]->ih_name, 283 min(strlen(irqhandlers[irq]->ih_name), 13)); 284 } else { 285 char *ptr = _intrnames + (irq * 14); 286 sprintf(ptr, "irq %2d ", irq); 287 } 288 #endif /* IRQSTATS */ 289 290 /* 291 * Update the irq masks. 292 * If ih_level is out of range then don't bother to update 293 * the masks. 294 */ 295 if (handler->ih_level >= 0 && handler->ih_level < IPL_LEVELS) { 296 irqhandler_t *ptr; 297 298 /* Clean the bit from all the masks */ 299 for (level = 0; level < IPL_LEVELS; ++level) 300 irqmasks[level] &= ~(1 << irq); 301 302 /* 303 * Find the lowest interrupt priority on the irq chain. 304 * Interrupt is allowable at priorities lower than this. 305 */ 306 ptr = irqhandlers[irq]; 307 if (ptr) { 308 level = ptr->ih_level - 1; 309 while (ptr) { 310 if (ptr->ih_level - 1 < level) 311 level = ptr->ih_level - 1; 312 ptr = ptr->ih_next; 313 } 314 while (level >= 0) { 315 irqmasks[level] |= (1 << irq); 316 --level; 317 } 318 } 319 } 320 321 /* 322 * Disable the appropriate mask bit if there are no handlers left for 323 * this IRQ. 324 */ 325 if (irqhandlers[irq] == NULL) 326 disable_irq(irq); 327 328 set_spl_masks(); 329 330 return(0); 331 } 332 333 334 void * 335 intr_claim(irq, level, name, ih_func, ih_arg) 336 int irq; 337 int level; 338 const char *name; 339 int (*ih_func) __P((void *)); 340 void *ih_arg; 341 { 342 irqhandler_t *ih; 343 344 ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT); 345 if (!ih) 346 panic("intr_claim(): Cannot malloc handler memory"); 347 348 ih->ih_level = level; 349 ih->ih_name = name; 350 ih->ih_func = ih_func; 351 ih->ih_arg = ih_arg; 352 ih->ih_flags = 0; 353 354 if (irq_claim(irq, ih) != 0) 355 return(NULL); 356 return(ih); 357 } 358 359 360 int 361 intr_release(arg) 362 void *arg; 363 { 364 irqhandler_t *ih = (irqhandler_t *)arg; 365 366 if (irq_release(ih->ih_num, ih) == 0) { 367 free(ih, M_DEVBUF); 368 return(0); 369 } 370 return(1); 371 } 372 373 374 /* 375 * void disable_irq(int irq) 376 * 377 * Disables a specific irq. The irq is removed from the master irq mask 378 */ 379 380 void 381 disable_irq(irq) 382 int irq; 383 { 384 register int oldirqstate; 385 386 oldirqstate = disable_interrupts(I32_bit); 387 current_mask &= ~(1 << irq); 388 irq_setmasks(); 389 restore_interrupts(oldirqstate); 390 } 391 392 393 /* 394 * void enable_irq(int irq) 395 * 396 * Enables a specific irq. The irq is added to the master irq mask 397 * This routine should be used with caution. A handler should already 398 * be installed. 399 */ 400 401 void 402 enable_irq(irq) 403 int irq; 404 { 405 register u_int oldirqstate; 406 407 oldirqstate = disable_interrupts(I32_bit); 408 current_mask |= (1 << irq); 409 irq_setmasks(); 410 restore_interrupts(oldirqstate); 411 } 412 413 414 /* 415 * void stray_irqhandler(u_int mask) 416 * 417 * Handler for stray interrupts. This gets called if a handler cannot be 418 * found for an interrupt. 419 */ 420 421 void stray_irqhandler(u_int); /* called from assembly */ 422 423 void 424 stray_irqhandler(mask) 425 u_int mask; 426 { 427 static u_int stray_irqs = 0; 428 429 if (++stray_irqs <= 8) 430 log(LOG_ERR, "Stray interrupt %08x%s\n", mask, 431 stray_irqs >= 8 ? ": stopped logging" : ""); 432 } 433
Indexes created Tue Sep 30 20:09:53 GMT 2025