isa_irqhandler.c revision 1.19
1 /* $NetBSD: isa_irqhandler.c,v 1.19 2008/01/06 01:19:42 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 1.19 2008/01/06 01:19:42 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 int current_intr_depth; 94 u_int current_mask; 95 u_int actual_mask; 96 u_int disabled_mask; 97 u_int irqmasks[IPL_LEVELS]; 98 99 /* Prototypes */ 100 101 extern void set_spl_masks(void); 102 void irq_calculatemasks(void); 103 void stray_irqhandler(u_int); 104 105 #define WriteWord(a, b) *((volatile unsigned int *)(a)) = (b) 106 107 /* 108 * void irq_init(void) 109 * 110 * Initialise the IRQ/FIQ sub system 111 */ 112 113 void 114 irq_init() 115 { 116 int loop; 117 118 /* Clear all the IRQ handlers and the irq block masks */ 119 for (loop = 0; loop < NIRQS; ++loop) { 120 irqhandlers[loop] = NULL; 121 } 122 123 /* 124 * Setup the irqmasks for the different Interrupt Priority Levels 125 * We will start with no bits set and these will be updated as handlers 126 * are installed at different IPL's. 127 */ 128 for (loop = 0; loop < IPL_LEVELS; ++loop) 129 irqmasks[loop] = 0; 130 131 current_intr_depth = 0; 132 current_mask = 0x00000000; 133 disabled_mask = 0x00000000; 134 actual_mask = 0x00000000; 135 136 set_spl_masks(); 137 138 /* Enable IRQ's and FIQ's */ 139 enable_interrupts(I32_bit | F32_bit); 140 } 141 142 143 /* 144 * int irq_claim(int irq, irqhandler_t *handler) 145 * 146 * Enable an IRQ and install a handler for it. 147 */ 148 149 int 150 irq_claim(irq, handler, group, name) 151 int irq; 152 irqhandler_t *handler; 153 const char *group; 154 const char *name; 155 { 156 157 #ifdef DIAGNOSTIC 158 /* Sanity check */ 159 if (handler == NULL) 160 panic("NULL interrupt handler"); 161 if (handler->ih_func == NULL) 162 panic("Interrupt handler does not have a function"); 163 #endif /* DIAGNOSTIC */ 164 165 /* 166 * IRQ_INSTRUCT indicates that we should get the irq number 167 * from the irq structure 168 */ 169 if (irq == IRQ_INSTRUCT) 170 irq = handler->ih_num; 171 172 /* Make sure the irq number is valid */ 173 if (irq < 0 || irq >= NIRQS) 174 return(-1); 175 176 /* Make sure the level is valid */ 177 if (handler->ih_level < 0 || handler->ih_level >= IPL_LEVELS) 178 return(-1); 179 180 /* Attach evcnt */ 181 evcnt_attach_dynamic(&handler->ih_ev, EVCNT_TYPE_INTR, NULL, 182 group, name); 183 184 /* Attach handler at top of chain */ 185 handler->ih_next = irqhandlers[irq]; 186 irqhandlers[irq] = handler; 187 188 /* 189 * Reset the flags for this handler. 190 * As the handler is now in the chain mark it as active. 191 */ 192 handler->ih_flags = 0 | IRQ_FLAG_ACTIVE; 193 194 /* 195 * Record the interrupt number for accounting. 196 * Done here as the accounting number may not be the same as the 197 * IRQ number though for the moment they are 198 */ 199 handler->ih_num = irq; 200 201 irq_calculatemasks(); 202 203 enable_irq(irq); 204 set_spl_masks(); 205 return(0); 206 } 207 208 209 /* 210 * int irq_release(int irq, irqhandler_t *handler) 211 * 212 * Disable an IRQ and remove a handler for it. 213 */ 214 215 int 216 irq_release(irq, handler) 217 int irq; 218 irqhandler_t *handler; 219 { 220 irqhandler_t *irqhand; 221 irqhandler_t **prehand; 222 223 /* 224 * IRQ_INSTRUCT indicates that we should get the irq number 225 * from the irq structure 226 */ 227 if (irq == IRQ_INSTRUCT) 228 irq = handler->ih_num; 229 230 /* Make sure the irq number is valid */ 231 if (irq < 0 || irq >= NIRQS) 232 return(-1); 233 234 /* Locate the handler */ 235 prehand = &irqhandlers[irq]; 236 irqhand = *prehand; 237 238 while (irqhand && handler != irqhand) { 239 prehand = &irqhand->ih_next; 240 irqhand = *prehand; 241 } 242 243 /* Remove the handler if located */ 244 if (irqhand) 245 *prehand = irqhand->ih_next; 246 else 247 return(-1); 248 249 /* The handler has been removed from the chain so mark it as inactive */ 250 irqhand->ih_flags &= ~IRQ_FLAG_ACTIVE; 251 252 /* Make sure the head of the handler list is active */ 253 if (irqhandlers[irq]) 254 irqhandlers[irq]->ih_flags |= IRQ_FLAG_ACTIVE; 255 256 evcnt_detach(&irqhand->ih_ev); 257 258 irq_calculatemasks(); 259 260 /* 261 * Disable the appropriate mask bit if there are no handlers left for 262 * this IRQ. 263 */ 264 if (irqhandlers[irq] == NULL) 265 disable_irq(irq); 266 267 set_spl_masks(); 268 269 return(0); 270 } 271 272 /* adapted from .../i386/isa/isa_machdep.c */ 273 /* 274 * Recalculate the interrupt masks from scratch. 275 * We could code special registry and deregistry versions of this function that 276 * would be faster, but the code would be nastier, and we don't expect this to 277 * happen very much anyway. 278 */ 279 void 280 irq_calculatemasks() 281 { 282 int irq, level; 283 irqhandler_t *ptr; 284 int irqlevel[NIRQS]; 285 286 /* First, figure out which levels each IRQ uses. */ 287 for (irq = 0; irq < NIRQS; irq++) { 288 int levels = 0; 289 for (ptr = irqhandlers[irq]; ptr; ptr = ptr->ih_next) 290 levels |= 1 << ptr->ih_level; 291 irqlevel[irq] = levels; 292 } 293 294 /* Then figure out which IRQs use each level. */ 295 for (level = 0; level < IPL_LEVELS; level++) { 296 int irqs = 0; 297 for (irq = 0; irq < NIRQS; irq++) 298 if (irqlevel[irq] & (1 << level)) 299 irqs |= 1 << irq; 300 irqmasks[level] = ~irqs; 301 } 302 303 /* 304 * Enforce a hierarchy that gives slow devices a better chance at not 305 * dropping data. 306 */ 307 irqmasks[IPL_SOFTCLOCK] &= irqmasks[IPL_NONE]; 308 irqmasks[IPL_SOFTBIO] &= irqmasks[IPL_SOFTCLOCK]; 309 irqmasks[IPL_SOFTNET] &= irqmasks[IPL_SOFTBIO]; 310 irqmasks[IPL_SOFTSERIAL] &= irqmasks[IPL_SOFTNET]; 311 irqmasks[IPL_VM] &= irqmasks[IPL_SOFTSERIAL]; 312 irqmasks[IPL_CLOCK] &= irqmasks[IPL_VM]; 313 irqmasks[IPL_HIGH] &= irqmasks[IPL_CLOCK]; 314 } 315 316 317 void * 318 intr_claim(irq, level, ih_func, ih_arg, group, name) 319 int irq; 320 int level; 321 int (*ih_func)(void *); 322 void *ih_arg; 323 const char *group; 324 const char *name; 325 { 326 irqhandler_t *ih; 327 328 ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT | M_ZERO); 329 if (!ih) 330 panic("intr_claim(): Cannot malloc handler memory"); 331 332 ih->ih_level = level; 333 ih->ih_func = ih_func; 334 ih->ih_arg = ih_arg; 335 ih->ih_flags = 0; 336 337 if (irq_claim(irq, ih, group, name) != 0) 338 return(NULL); 339 340 return(ih); 341 } 342 343 int 344 intr_release(arg) 345 void *arg; 346 { 347 irqhandler_t *ih = (irqhandler_t *)arg; 348 349 if (irq_release(ih->ih_num, ih) == 0) { 350 free(ih, M_DEVBUF); 351 return(0); 352 } 353 return(1); 354 } 355 356 357 /* 358 * void disable_irq(int irq) 359 * 360 * Disables a specific irq. The irq is removed from the master irq mask 361 */ 362 363 void 364 disable_irq(irq) 365 int irq; 366 { 367 u_int oldirqstate; 368 369 oldirqstate = disable_interrupts(I32_bit); 370 current_mask &= ~(1 << irq); 371 irq_setmasks(); 372 restore_interrupts(oldirqstate); 373 } 374 375 376 /* 377 * void enable_irq(int irq) 378 * 379 * Enables a specific irq. The irq is added to the master irq mask 380 * This routine should be used with caution. A handler should already 381 * be installed. 382 */ 383 384 void 385 enable_irq(irq) 386 int irq; 387 { 388 u_int oldirqstate; 389 390 oldirqstate = disable_interrupts(I32_bit); 391 current_mask |= (1 << irq); 392 irq_setmasks(); 393 restore_interrupts(oldirqstate); 394 } 395 396 397 /* 398 * void stray_irqhandler(u_int mask) 399 * 400 * Handler for stray interrupts. This gets called if a handler cannot be 401 * found for an interrupt. 402 */ 403 404 void 405 stray_irqhandler(mask) 406 u_int mask; 407 { 408 static u_int stray_irqs = 0; 409 410 if (++stray_irqs <= 8) 411 log(LOG_ERR, "Stray interrupt %08x%s\n", mask, 412 stray_irqs >= 8 ? ": stopped logging" : ""); 413 } 414
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