1 /* $NetBSD: ofw_irqhandler.c,v 1.17 2009/03/18 10:22:24 cegger 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 1.17 2009/03/18 10:22:24 cegger Exp $"); 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/syslog.h> 50 #include <sys/malloc.h> 51 52 #include <uvm/uvm_extern.h> 53 54 #include <machine/intr.h> 55 #include <machine/irqhandler.h> 56 #include <machine/cpu.h> 57 58 irqhandler_t *irqhandlers[NIRQS]; 59 60 u_int current_mask; 61 u_int actual_mask; 62 u_int disabled_mask; 63 u_int irqmasks[IPL_LEVELS]; 64 extern u_int intrcnt[]; 65 66 extern char *_intrnames; 67 68 /* Prototypes */ 69 70 int podule_irqhandler(void); 71 extern void set_spl_masks(void); 72 73 /* 74 * void irq_init(void) 75 * 76 * Initialise the IRQ/FIQ sub system 77 */ 78 79 void 80 irq_init(void) 81 { 82 int loop; 83 84 /* Clear all the IRQ handlers and the irq block masks */ 85 for (loop = 0; loop < NIRQS; ++loop) { 86 irqhandlers[loop] = NULL; 87 } 88 89 /* 90 * Setup the irqmasks for the different Interrupt Priority Levels 91 * We will start with no bits set and these will be updated as handlers 92 * are installed at different IPL's. 93 */ 94 for (loop = 0; loop < IPL_LEVELS; ++loop) 95 irqmasks[loop] = 0; 96 97 current_mask = 0x00000000; 98 disabled_mask = 0x00000000; 99 actual_mask = 0x00000000; 100 101 set_spl_masks(); 102 103 /* Enable IRQ's and FIQ's */ 104 enable_interrupts(I32_bit | F32_bit); 105 } 106 107 108 /* 109 * int irq_claim(int irq, irqhandler_t *handler) 110 * 111 * Enable an IRQ and install a handler for it. 112 */ 113 114 int 115 irq_claim(int irq, irqhandler_t *handler, const char *group, const char *name) 116 { 117 int level; 118 119 #ifdef DIAGNOSTIC 120 /* Sanity check */ 121 if (handler == NULL) 122 panic("NULL interrupt handler"); 123 if (handler->ih_func == NULL) 124 panic("Interrupt handler does not have a function"); 125 #endif /* DIAGNOSTIC */ 126 127 /* 128 * IRQ_INSTRUCT indicates that we should get the irq number 129 * from the irq structure 130 */ 131 if (irq == IRQ_INSTRUCT) 132 irq = handler->ih_num; 133 134 /* Make sure the irq number is valid */ 135 if (irq < 0 || irq >= NIRQS) 136 return(-1); 137 138 /* Make sure the level is valid */ 139 if (handler->ih_level < 0 || handler->ih_level >= IPL_LEVELS) 140 return(-1); 141 142 evcnt_attach_dynamic(&handler->ih_ev, EVCNT_TYPE_INTR, NULL, 143 group, name); 144 145 /* Attach handler at top of chain */ 146 handler->ih_next = irqhandlers[irq]; 147 irqhandlers[irq] = handler; 148 149 /* 150 * Reset the flags for this handler. 151 * As the handler is now in the chain mark it as active. 152 */ 153 handler->ih_flags = 0 | IRQ_FLAG_ACTIVE; 154 155 /* 156 * Record the interrupt number for accounting. 157 * Done here as the accounting number may not be the same as the 158 * IRQ number though for the moment they are 159 */ 160 handler->ih_num = irq; 161 162 /* 163 * Update the irq masks. 164 * Find the lowest interrupt priority on the irq chain. 165 * Interrupt is allowable at priorities lower than this. 166 * If ih_level is out of range then don't bother to update 167 * the masks. 168 */ 169 if (handler->ih_level >= 0 && handler->ih_level < IPL_LEVELS) { 170 irqhandler_t *ptr; 171 172 /* 173 * Find the lowest interrupt priority on the irq chain. 174 * Interrupt is allowable at priorities lower than this. 175 */ 176 ptr = irqhandlers[irq]; 177 if (ptr) { 178 level = ptr->ih_level - 1; 179 while (ptr) { 180 if (ptr->ih_level - 1 < level) 181 level = ptr->ih_level - 1; 182 ptr = ptr->ih_next; 183 } 184 while (level >= 0) { 185 irqmasks[level] |= (1 << irq); 186 --level; 187 } 188 } 189 190 #include "sl.h" 191 #include "ppp.h" 192 #if NSL > 0 || NPPP > 0 193 /* In the presence of SLIP or PPP, splimp > spltty. */ 194 irqmasks[IPL_NET] &= irqmasks[IPL_TTY]; 195 #endif 196 } 197 198 enable_irq(irq); 199 set_spl_masks(); 200 201 return(0); 202 } 203 204 205 /* 206 * int irq_release(int irq, irqhandler_t *handler) 207 * 208 * Disable an IRQ and remove a handler for it. 209 */ 210 211 int 212 irq_release(int irq, irqhandler_t *handler) 213 { 214 int level; 215 irqhandler_t *irqhand; 216 irqhandler_t **prehand; 217 218 /* 219 * IRQ_INSTRUCT indicates that we should get the irq number 220 * from the irq structure 221 */ 222 if (irq == IRQ_INSTRUCT) 223 irq = handler->ih_num; 224 225 /* Make sure the irq number is valid */ 226 if (irq < 0 || irq >= NIRQS) 227 return(-1); 228 229 /* Locate the handler */ 230 irqhand = irqhandlers[irq]; 231 prehand = &irqhandlers[irq]; 232 233 while (irqhand && handler != irqhand) { 234 prehand = &irqhand; 235 irqhand = irqhand->ih_next; 236 } 237 238 /* Remove the handler if located */ 239 if (irqhand) 240 *prehand = irqhand->ih_next; 241 else 242 return(-1); 243 244 /* Now the handler has been removed from the chain mark is as inactive */ 245 irqhand->ih_flags &= ~IRQ_FLAG_ACTIVE; 246 247 /* Make sure the head of the handler list is active */ 248 if (irqhandlers[irq]) 249 irqhandlers[irq]->ih_flags |= IRQ_FLAG_ACTIVE; 250 251 /* 252 * Update the irq masks. 253 * If ih_level is out of range then don't bother to update 254 * the masks. 255 */ 256 if (handler->ih_level >= 0 && handler->ih_level < IPL_LEVELS) { 257 irqhandler_t *ptr; 258 259 /* Clean the bit from all the masks */ 260 for (level = 0; level < IPL_LEVELS; ++level) 261 irqmasks[level] &= ~(1 << irq); 262 263 /* 264 * Find the lowest interrupt priority on the irq chain. 265 * Interrupt is allowable at priorities lower than this. 266 */ 267 ptr = irqhandlers[irq]; 268 if (ptr) { 269 level = ptr->ih_level - 1; 270 while (ptr) { 271 if (ptr->ih_level - 1 < level) 272 level = ptr->ih_level - 1; 273 ptr = ptr->ih_next; 274 } 275 while (level >= 0) { 276 irqmasks[level] |= (1 << irq); 277 --level; 278 } 279 } 280 } 281 282 /* 283 * Disable the appropriate mask bit if there are no handlers left for 284 * this IRQ. 285 */ 286 if (irqhandlers[irq] == NULL) 287 disable_irq(irq); 288 289 set_spl_masks(); 290 291 return(0); 292 } 293 294 295 void * 296 intr_claim(int irq, int level, int (*ih_func)(void *), void *ih_arg, const char *group, const char *name) 297 { 298 irqhandler_t *ih; 299 300 ih = malloc(sizeof(*ih), M_DEVBUF, M_NOWAIT|M_ZERO); 301 if (!ih) 302 panic("intr_claim(): Cannot malloc handler memory"); 303 304 ih->ih_level = level; 305 ih->ih_func = ih_func; 306 ih->ih_arg = ih_arg; 307 ih->ih_flags = 0; 308 309 if (irq_claim(irq, ih, group, name) != 0) 310 return(NULL); 311 return(ih); 312 } 313 314 315 int 316 intr_release(void *arg) 317 { 318 irqhandler_t *ih = (irqhandler_t *)arg; 319 320 if (irq_release(ih->ih_num, ih) == 0) { 321 free(ih, M_DEVBUF); 322 return(0); 323 } 324 return(1); 325 } 326 327 328 /* 329 * void disable_irq(int irq) 330 * 331 * Disables a specific irq. The irq is removed from the master irq mask 332 */ 333 334 void 335 disable_irq(int irq) 336 { 337 register int oldirqstate; 338 339 oldirqstate = disable_interrupts(I32_bit); 340 current_mask &= ~(1 << irq); 341 irq_setmasks(); 342 restore_interrupts(oldirqstate); 343 } 344 345 346 /* 347 * void enable_irq(int irq) 348 * 349 * Enables a specific irq. The irq is added to the master irq mask 350 * This routine should be used with caution. A handler should already 351 * be installed. 352 */ 353 354 void 355 enable_irq(int irq) 356 { 357 register u_int oldirqstate; 358 359 oldirqstate = disable_interrupts(I32_bit); 360 current_mask |= (1 << irq); 361 irq_setmasks(); 362 restore_interrupts(oldirqstate); 363 } 364 365 366 /* 367 * void stray_irqhandler(u_int mask) 368 * 369 * Handler for stray interrupts. This gets called if a handler cannot be 370 * found for an interrupt. 371 */ 372 373 void stray_irqhandler(u_int); /* called from assembly */ 374 375 void 376 stray_irqhandler(u_int mask) 377 { 378 static u_int stray_irqs = 0; 379 380 if (++stray_irqs <= 8) 381 log(LOG_ERR, "Stray interrupt %08x%s\n", mask, 382 stray_irqs >= 8 ? ": stopped logging" : ""); 383 } 384