isa_irqhandler.c revision 1.21
1 /* $NetBSD: isa_irqhandler.c,v 1.21 2008/04/27 18:58:47 matt Exp $ */ 2 3 /* 4 * Copyright 1997 5 * Digital Equipment Corporation. All rights reserved. 6 * 7 * This software is furnished under license and may be used and 8 * copied only in accordance with the following terms and conditions. 9 * Subject to these conditions, you may download, copy, install, 10 * use, modify and distribute this software in source and/or binary 11 * form. No title or ownership is transferred hereby. 12 * 13 * 1) Any source code used, modified or distributed must reproduce 14 * and retain this copyright notice and list of conditions as 15 * they appear in the source file. 16 * 17 * 2) No right is granted to use any trade name, trademark, or logo of 18 * Digital Equipment Corporation. Neither the "Digital Equipment 19 * Corporation" name nor any trademark or logo of Digital Equipment 20 * Corporation may be used to endorse or promote products derived 21 * from this software without the prior written permission of 22 * Digital Equipment Corporation. 23 * 24 * 3) This software is provided "AS-IS" and any express or implied 25 * warranties, including but not limited to, any implied warranties 26 * of merchantability, fitness for a particular purpose, or 27 * non-infringement are disclaimed. In no event shall DIGITAL be 28 * liable for any damages whatsoever, and in particular, DIGITAL 29 * shall not be liable for special, indirect, consequential, or 30 * incidental damages or damages for lost profits, loss of 31 * revenue or loss of use, whether such damages arise in contract, 32 * negligence, tort, under statute, in equity, at law or otherwise, 33 * even if advised of the possibility of such damage. 34 */ 35 36 /* 37 * Copyright (c) 1994-1998 Mark Brinicombe. 38 * Copyright (c) 1994 Brini. 39 * All rights reserved. 40 * 41 * This code is derived from software written for Brini by Mark Brinicombe 42 * 43 * Redistribution and use in source and binary forms, with or without 44 * modification, are permitted provided that the following conditions 45 * are met: 46 * 1. Redistributions of source code must retain the above copyright 47 * notice, this list of conditions and the following disclaimer. 48 * 2. Redistributions in binary form must reproduce the above copyright 49 * notice, this list of conditions and the following disclaimer in the 50 * documentation and/or other materials provided with the distribution. 51 * 3. All advertising materials mentioning features or use of this software 52 * must display the following acknowledgement: 53 * This product includes software developed by Mark Brinicombe 54 * for the NetBSD Project. 55 * 4. The name of the company nor the name of the author may be used to 56 * endorse or promote products derived from this software without specific 57 * prior written permission. 58 * 59 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 60 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 61 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 62 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 63 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 64 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 65 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 66 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 67 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 68 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 69 * 70 * IRQ/FIQ initialisation, claim, release and handler routines 71 * 72 * from: irqhandler.c 73 * 74 * Created : 30/09/94 75 */ 76 77 #include <sys/cdefs.h> 78 __KERNEL_RCSID(0, "$NetBSD: isa_irqhandler.c,v 1.21 2008/04/27 18:58:47 matt Exp $"); 79 80 #include <sys/param.h> 81 #include <sys/systm.h> 82 #include <sys/syslog.h> 83 #include <sys/malloc.h> 84 85 #include <uvm/uvm_extern.h> 86 87 #include <machine/intr.h> 88 #include <machine/irqhandler.h> 89 #include <machine/cpu.h> 90 91 irqhandler_t *irqhandlers[NIRQS]; 92 93 u_int current_mask; 94 u_int actual_mask; 95 u_int disabled_mask; 96 u_int irqmasks[NIPL]; 97 98 /* Prototypes */ 99 100 extern void set_spl_masks(void); 101 void irq_calculatemasks(void); 102 void stray_irqhandler(u_int); 103 104 #define WriteWord(a, b) *((volatile unsigned int *)(a)) = (b) 105 106 /* 107 * void irq_init(void) 108 * 109 * Initialise the IRQ/FIQ sub system 110 */ 111 112 void 113 irq_init() 114 { 115 int loop; 116 117 /* Clear all the IRQ handlers and the irq block masks */ 118 for (loop = 0; loop < NIRQS; ++loop) { 119 irqhandlers[loop] = NULL; 120 } 121 122 /* 123 * Setup the irqmasks for the different Interrupt Priority Levels 124 * We will start with no bits set and these will be updated as handlers 125 * are installed at different IPL's. 126 */ 127 for (loop = 0; loop < NIPL; ++loop) 128 irqmasks[loop] = 0; 129 130 current_mask = 0x00000000; 131 disabled_mask = 0x00000000; 132 actual_mask = 0x00000000; 133 134 set_spl_masks(); 135 136 /* Enable IRQ's and FIQ's */ 137 enable_interrupts(I32_bit | F32_bit); 138 } 139 140 141 /* 142 * int irq_claim(int irq, irqhandler_t *handler) 143 * 144 * Enable an IRQ and install a handler for it. 145 */ 146 147 int 148 irq_claim(irq, handler, group, name) 149 int irq; 150 irqhandler_t *handler; 151 const char *group; 152 const char *name; 153 { 154 155 #ifdef DIAGNOSTIC 156 /* Sanity check */ 157 if (handler == NULL) 158 panic("NULL interrupt handler"); 159 if (handler->ih_func == NULL) 160 panic("Interrupt handler does not have a function"); 161 #endif /* DIAGNOSTIC */ 162 163 /* 164 * IRQ_INSTRUCT indicates that we should get the irq number 165 * from the irq structure 166 */ 167 if (irq == IRQ_INSTRUCT) 168 irq = handler->ih_num; 169 170 /* Make sure the irq number is valid */ 171 if (irq < 0 || irq >= NIRQS) 172 return(-1); 173 174 /* Make sure the level is valid */ 175 if (handler->ih_level < 0 || handler->ih_level >= NIPL) 176 return(-1); 177 178 /* Attach evcnt */ 179 evcnt_attach_dynamic(&handler->ih_ev, EVCNT_TYPE_INTR, NULL, 180 group, name); 181 182 /* Attach handler at top of chain */ 183 handler->ih_next = irqhandlers[irq]; 184 irqhandlers[irq] = handler; 185 186 /* 187 * Reset the flags for this handler. 188 * As the handler is now in the chain mark it as active. 189 */ 190 handler->ih_flags = 0 | IRQ_FLAG_ACTIVE; 191 192 /* 193 * Record the interrupt number for accounting. 194 * Done here as the accounting number may not be the same as the 195 * IRQ number though for the moment they are 196 */ 197 handler->ih_num = irq; 198 199 irq_calculatemasks(); 200 201 enable_irq(irq); 202 set_spl_masks(); 203 return(0); 204 } 205 206 207 /* 208 * int irq_release(int irq, irqhandler_t *handler) 209 * 210 * Disable an IRQ and remove a handler for it. 211 */ 212 213 int 214 irq_release(irq, handler) 215 int irq; 216 irqhandler_t *handler; 217 { 218 irqhandler_t *irqhand; 219 irqhandler_t **prehand; 220 221 /* 222 * IRQ_INSTRUCT indicates that we should get the irq number 223 * from the irq structure 224 */ 225 if (irq == IRQ_INSTRUCT) 226 irq = handler->ih_num; 227 228 /* Make sure the irq number is valid */ 229 if (irq < 0 || irq >= NIRQS) 230 return(-1); 231 232 /* Locate the handler */ 233 prehand = &irqhandlers[irq]; 234 irqhand = *prehand; 235 236 while (irqhand && handler != irqhand) { 237 prehand = &irqhand->ih_next; 238 irqhand = *prehand; 239 } 240 241 /* Remove the handler if located */ 242 if (irqhand) 243 *prehand = irqhand->ih_next; 244 else 245 return(-1); 246 247 /* The handler has been removed from the chain so mark it as inactive */ 248 irqhand->ih_flags &= ~IRQ_FLAG_ACTIVE; 249 250 /* Make sure the head of the handler list is active */ 251 if (irqhandlers[irq]) 252 irqhandlers[irq]->ih_flags |= IRQ_FLAG_ACTIVE; 253 254 evcnt_detach(&irqhand->ih_ev); 255 256 irq_calculatemasks(); 257 258 /* 259 * Disable the appropriate mask bit if there are no handlers left for 260 * this IRQ. 261 */ 262 if (irqhandlers[irq] == NULL) 263 disable_irq(irq); 264 265 set_spl_masks(); 266 267 return(0); 268 } 269 270 /* adapted from .../i386/isa/isa_machdep.c */ 271 /* 272 * Recalculate the interrupt masks from scratch. 273 * We could code special registry and deregistry versions of this function that 274 * would be faster, but the code would be nastier, and we don't expect this to 275 * happen very much anyway. 276 */ 277 void 278 irq_calculatemasks() 279 { 280 int irq, level; 281 irqhandler_t *ptr; 282 int irqlevel[NIRQS]; 283 284 /* First, figure out which levels each IRQ uses. */ 285 for (irq = 0; irq < NIRQS; irq++) { 286 int levels = 0; 287 for (ptr = irqhandlers[irq]; ptr; ptr = ptr->ih_next) 288 levels |= 1 << ptr->ih_level; 289 irqlevel[irq] = levels; 290 } 291 292 /* Then figure out which IRQs use each level. */ 293 for (level = 0; level < NIPL; level++) { 294 int irqs = 0; 295 for (irq = 0; irq < NIRQS; irq++) 296 if (irqlevel[irq] & (1 << level)) 297 irqs |= 1 << irq; 298 irqmasks[level] = ~irqs; 299 } 300 301 /* 302 * Enforce a hierarchy that gives slow devices a better chance at not 303 * dropping data. 304 */ 305 KASSERT(irqmasks[IPL_NONE] == ~0); 306 irqmasks[IPL_SOFTCLOCK] &= irqmasks[IPL_NONE]; 307 irqmasks[IPL_SOFTBIO] &= irqmasks[IPL_SOFTCLOCK]; 308 irqmasks[IPL_SOFTNET] &= irqmasks[IPL_SOFTBIO]; 309 irqmasks[IPL_SOFTSERIAL] &= irqmasks[IPL_SOFTNET]; 310 irqmasks[IPL_VM] &= irqmasks[IPL_SOFTSERIAL]; 311 irqmasks[IPL_CLOCK] &= irqmasks[IPL_VM]; 312 irqmasks[IPL_HIGH] &= irqmasks[IPL_CLOCK]; 313 } 314 315 316 void * 317 intr_claim(irq, level, ih_func, ih_arg, group, name) 318 int irq; 319 int level; 320 int (*ih_func)(void *); 321 void *ih_arg; 322 const char *group; 323 const char *name; 324 { 325 irqhandler_t *ih; 326 327 ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT | M_ZERO); 328 if (!ih) 329 panic("intr_claim(): Cannot malloc handler memory"); 330 331 ih->ih_level = level; 332 ih->ih_func = ih_func; 333 ih->ih_arg = ih_arg; 334 ih->ih_flags = 0; 335 336 if (irq_claim(irq, ih, group, name) != 0) 337 return(NULL); 338 339 return(ih); 340 } 341 342 int 343 intr_release(arg) 344 void *arg; 345 { 346 irqhandler_t *ih = (irqhandler_t *)arg; 347 348 if (irq_release(ih->ih_num, ih) == 0) { 349 free(ih, M_DEVBUF); 350 return(0); 351 } 352 return(1); 353 } 354 355 356 /* 357 * void disable_irq(int irq) 358 * 359 * Disables a specific irq. The irq is removed from the master irq mask 360 */ 361 362 void 363 disable_irq(irq) 364 int irq; 365 { 366 u_int oldirqstate; 367 368 oldirqstate = disable_interrupts(I32_bit); 369 current_mask &= ~(1 << irq); 370 irq_setmasks(); 371 restore_interrupts(oldirqstate); 372 } 373 374 375 /* 376 * void enable_irq(int irq) 377 * 378 * Enables a specific irq. The irq is added to the master irq mask 379 * This routine should be used with caution. A handler should already 380 * be installed. 381 */ 382 383 void 384 enable_irq(irq) 385 int irq; 386 { 387 u_int oldirqstate; 388 389 oldirqstate = disable_interrupts(I32_bit); 390 current_mask |= (1 << irq); 391 irq_setmasks(); 392 restore_interrupts(oldirqstate); 393 } 394 395 396 /* 397 * void stray_irqhandler(u_int mask) 398 * 399 * Handler for stray interrupts. This gets called if a handler cannot be 400 * found for an interrupt. 401 */ 402 403 void 404 stray_irqhandler(mask) 405 u_int mask; 406 { 407 static u_int stray_irqs = 0; 408 409 if (++stray_irqs <= 8) 410 log(LOG_ERR, "Stray interrupt %08x%s\n", mask, 411 stray_irqs >= 8 ? ": stopped logging" : ""); 412 } 413
Indexes created Tue Sep 30 10:09:55 GMT 2025