ofw_irqhandler.c revision 1.9
1 /* $NetBSD: ofw_irqhandler.c,v 1.9 2007/02/19 21:46:32 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 1.9 2007/02/19 21:46:32 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 char *_intrnames; 70 71 /* Prototypes */ 72 73 int podule_irqhandler __P((void)); 74 extern void set_spl_masks __P((void)); 75 76 /* 77 * void irq_init(void) 78 * 79 * Initialise the IRQ/FIQ sub system 80 */ 81 82 void 83 irq_init() 84 { 85 int loop; 86 87 /* Clear all the IRQ handlers and the irq block masks */ 88 for (loop = 0; loop < NIRQS; ++loop) { 89 irqhandlers[loop] = NULL; 90 } 91 92 /* 93 * Setup the irqmasks for the different Interrupt Priority Levels 94 * We will start with no bits set and these will be updated as handlers 95 * are installed at different IPL's. 96 */ 97 for (loop = 0; loop < IPL_LEVELS; ++loop) 98 irqmasks[loop] = 0; 99 100 current_intr_depth = 0; 101 current_mask = 0x00000000; 102 disabled_mask = 0x00000000; 103 actual_mask = 0x00000000; 104 spl_mask = 0x00000000; 105 106 set_spl_masks(); 107 108 /* Enable IRQ's and FIQ's */ 109 enable_interrupts(I32_bit | F32_bit); 110 } 111 112 113 /* 114 * int irq_claim(int irq, irqhandler_t *handler) 115 * 116 * Enable an IRQ and install a handler for it. 117 */ 118 119 int 120 irq_claim(irq, handler) 121 int irq; 122 irqhandler_t *handler; 123 { 124 int level; 125 int loop; 126 127 #ifdef DIAGNOSTIC 128 /* Sanity check */ 129 if (handler == NULL) 130 panic("NULL interrupt handler"); 131 if (handler->ih_func == NULL) 132 panic("Interrupt handler does not have a function"); 133 #endif /* DIAGNOSTIC */ 134 135 /* 136 * IRQ_INSTRUCT indicates that we should get the irq number 137 * from the irq structure 138 */ 139 if (irq == IRQ_INSTRUCT) 140 irq = handler->ih_num; 141 142 /* Make sure the irq number is valid */ 143 if (irq < 0 || irq >= NIRQS) 144 return(-1); 145 146 /* Make sure the level is valid */ 147 if (handler->ih_level < 0 || handler->ih_level >= IPL_LEVELS) 148 return(-1); 149 150 /* Attach handler at top of chain */ 151 handler->ih_next = irqhandlers[irq]; 152 irqhandlers[irq] = handler; 153 154 /* 155 * Reset the flags for this handler. 156 * As the handler is now in the chain mark it as active. 157 */ 158 handler->ih_flags = 0 | IRQ_FLAG_ACTIVE; 159 160 /* 161 * Record the interrupt number for accounting. 162 * Done here as the accounting number may not be the same as the 163 * IRQ number though for the moment they are 164 */ 165 handler->ih_num = irq; 166 167 #ifdef IRQSTATS 168 /* Get the interrupt name from the head of the list */ 169 if (handler->ih_name) { 170 char *ptr = _intrnames + (irq * 14); 171 strcpy(ptr, " "); 172 strncpy(ptr, handler->ih_name, 173 min(strlen(handler->ih_name), 13)); 174 } else { 175 char *ptr = _intrnames + (irq * 14); 176 sprintf(ptr, "irq %2d ", irq); 177 } 178 #endif /* IRQSTATS */ 179 180 /* 181 * Update the irq masks. 182 * Find the lowest interrupt priority on the irq chain. 183 * Interrupt is allowable at priorities lower than this. 184 * If ih_level is out of range then don't bother to update 185 * the masks. 186 */ 187 if (handler->ih_level >= 0 && handler->ih_level < IPL_LEVELS) { 188 irqhandler_t *ptr; 189 190 /* 191 * Find the lowest interrupt priority on the irq chain. 192 * Interrupt is allowable at priorities lower than this. 193 */ 194 ptr = irqhandlers[irq]; 195 if (ptr) { 196 level = ptr->ih_level - 1; 197 while (ptr) { 198 if (ptr->ih_level - 1 < level) 199 level = ptr->ih_level - 1; 200 ptr = ptr->ih_next; 201 } 202 while (level >= 0) { 203 irqmasks[level] |= (1 << irq); 204 --level; 205 } 206 } 207 208 #include "sl.h" 209 #include "ppp.h" 210 #if NSL > 0 || NPPP > 0 211 /* In the presence of SLIP or PPP, splimp > spltty. */ 212 irqmasks[IPL_NET] &= irqmasks[IPL_TTY]; 213 #endif 214 } 215 216 enable_irq(irq); 217 set_spl_masks(); 218 219 return(0); 220 } 221 222 223 /* 224 * int irq_release(int irq, irqhandler_t *handler) 225 * 226 * Disable an IRQ and remove a handler for it. 227 */ 228 229 int 230 irq_release(irq, handler) 231 int irq; 232 irqhandler_t *handler; 233 { 234 int level; 235 int loop; 236 irqhandler_t *irqhand; 237 irqhandler_t **prehand; 238 extern char *_intrnames; 239 240 /* 241 * IRQ_INSTRUCT indicates that we should get the irq number 242 * from the irq structure 243 */ 244 if (irq == IRQ_INSTRUCT) 245 irq = handler->ih_num; 246 247 /* Make sure the irq number is valid */ 248 if (irq < 0 || irq >= NIRQS) 249 return(-1); 250 251 /* Locate the handler */ 252 irqhand = irqhandlers[irq]; 253 prehand = &irqhandlers[irq]; 254 255 while (irqhand && handler != irqhand) { 256 prehand = &irqhand; 257 irqhand = irqhand->ih_next; 258 } 259 260 /* Remove the handler if located */ 261 if (irqhand) 262 *prehand = irqhand->ih_next; 263 else 264 return(-1); 265 266 /* Now the handler has been removed from the chain mark is as inactive */ 267 irqhand->ih_flags &= ~IRQ_FLAG_ACTIVE; 268 269 /* Make sure the head of the handler list is active */ 270 if (irqhandlers[irq]) 271 irqhandlers[irq]->ih_flags |= IRQ_FLAG_ACTIVE; 272 273 #ifdef IRQSTATS 274 /* Get the interrupt name from the head of the list */ 275 if (irqhandlers[irq] && irqhandlers[irq]->ih_name) { 276 char *ptr = _intrnames + (irq * 14); 277 strcpy(ptr, " "); 278 strncpy(ptr, irqhandlers[irq]->ih_name, 279 min(strlen(irqhandlers[irq]->ih_name), 13)); 280 } else { 281 char *ptr = _intrnames + (irq * 14); 282 sprintf(ptr, "irq %2d ", irq); 283 } 284 #endif /* IRQSTATS */ 285 286 /* 287 * Update the irq masks. 288 * If ih_level is out of range then don't bother to update 289 * the masks. 290 */ 291 if (handler->ih_level >= 0 && handler->ih_level < IPL_LEVELS) { 292 irqhandler_t *ptr; 293 294 /* Clean the bit from all the masks */ 295 for (level = 0; level < IPL_LEVELS; ++level) 296 irqmasks[level] &= ~(1 << irq); 297 298 /* 299 * Find the lowest interrupt priority on the irq chain. 300 * Interrupt is allowable at priorities lower than this. 301 */ 302 ptr = irqhandlers[irq]; 303 if (ptr) { 304 level = ptr->ih_level - 1; 305 while (ptr) { 306 if (ptr->ih_level - 1 < level) 307 level = ptr->ih_level - 1; 308 ptr = ptr->ih_next; 309 } 310 while (level >= 0) { 311 irqmasks[level] |= (1 << irq); 312 --level; 313 } 314 } 315 } 316 317 /* 318 * Disable the appropriate mask bit if there are no handlers left for 319 * this IRQ. 320 */ 321 if (irqhandlers[irq] == NULL) 322 disable_irq(irq); 323 324 set_spl_masks(); 325 326 return(0); 327 } 328 329 330 void * 331 intr_claim(irq, level, name, ih_func, ih_arg) 332 int irq; 333 int level; 334 const char *name; 335 int (*ih_func) __P((void *)); 336 void *ih_arg; 337 { 338 irqhandler_t *ih; 339 340 ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT); 341 if (!ih) 342 panic("intr_claim(): Cannot malloc handler memory"); 343 344 ih->ih_level = level; 345 ih->ih_name = name; 346 ih->ih_func = ih_func; 347 ih->ih_arg = ih_arg; 348 ih->ih_flags = 0; 349 350 if (irq_claim(irq, ih) != 0) 351 return(NULL); 352 return(ih); 353 } 354 355 356 int 357 intr_release(arg) 358 void *arg; 359 { 360 irqhandler_t *ih = (irqhandler_t *)arg; 361 362 if (irq_release(ih->ih_num, ih) == 0) { 363 free(ih, M_DEVBUF); 364 return(0); 365 } 366 return(1); 367 } 368 369 370 /* 371 * void disable_irq(int irq) 372 * 373 * Disables a specific irq. The irq is removed from the master irq mask 374 */ 375 376 void 377 disable_irq(irq) 378 int irq; 379 { 380 register int oldirqstate; 381 382 oldirqstate = disable_interrupts(I32_bit); 383 current_mask &= ~(1 << irq); 384 irq_setmasks(); 385 restore_interrupts(oldirqstate); 386 } 387 388 389 /* 390 * void enable_irq(int irq) 391 * 392 * Enables a specific irq. The irq is added to the master irq mask 393 * This routine should be used with caution. A handler should already 394 * be installed. 395 */ 396 397 void 398 enable_irq(irq) 399 int irq; 400 { 401 register u_int oldirqstate; 402 403 oldirqstate = disable_interrupts(I32_bit); 404 current_mask |= (1 << irq); 405 irq_setmasks(); 406 restore_interrupts(oldirqstate); 407 } 408 409 410 /* 411 * void stray_irqhandler(u_int mask) 412 * 413 * Handler for stray interrupts. This gets called if a handler cannot be 414 * found for an interrupt. 415 */ 416 417 void stray_irqhandler(u_int); /* called from assembly */ 418 419 void 420 stray_irqhandler(mask) 421 u_int mask; 422 { 423 static u_int stray_irqs = 0; 424 425 if (++stray_irqs <= 8) 426 log(LOG_ERR, "Stray interrupt %08x%s\n", mask, 427 stray_irqs >= 8 ? ": stopped logging" : ""); 428 } 429
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