1/* $NetBSD: ofw_irqhandler.c,v 1.23 2020/11/20 18:26:26 thorpej 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 1.23 2020/11/20 18:26:26 thorpej Exp $"); 46 47#include <sys/param.h> 48#include <sys/systm.h> 49#include <sys/syslog.h> 50#include <sys/kmem.h> 51 52#include <sys/intr.h> 53#include <machine/irqhandler.h> 54#include <machine/cpu.h> 55 56irqhandler_t *irqhandlers[NIRQS]; 57 58u_int current_mask; 59u_int actual_mask; 60u_int disabled_mask; 61u_int irqmasks[NIPL]; 62 63/* Prototypes */ 64 65int podule_irqhandler(void); 66extern void set_spl_masks(void); 67 68/* 69 * void irq_init(void) 70 * 71 * Initialise the IRQ/FIQ sub system 72 */ 73 74void 75irq_init(void) 76{ 77 int loop; 78 79 /* Clear all the IRQ handlers and the irq block masks */ 80 for (loop = 0; loop < NIRQS; ++loop) { 81 irqhandlers[loop] = NULL; 82 } 83 84 /* 85 * Setup the irqmasks for the different Interrupt Priority Levels 86 * We will start with no bits set and these will be updated as handlers 87 * are installed at different IPL's. 88 */ 89 for (loop = 0; loop < NIPL; ++loop) 90 irqmasks[loop] = 0; 91 92 current_mask = 0x00000000; 93 disabled_mask = 0x00000000; 94 actual_mask = 0x00000000; 95 96 set_spl_masks(); 97 98 /* Enable IRQ's and FIQ's */ 99 enable_interrupts(I32_bit | F32_bit); 100} 101 102 103/* 104 * int irq_claim(int irq, irqhandler_t *handler) 105 * 106 * Enable an IRQ and install a handler for it. 107 */ 108 109int 110irq_claim(int irq, irqhandler_t *handler, const char *group, const char *name) 111{ 112 int level; 113 114#ifdef DIAGNOSTIC 115 /* Sanity check */ 116 if (handler == NULL) 117 panic("NULL interrupt handler"); 118 if (handler->ih_func == NULL) 119 panic("Interrupt handler does not have a function"); 120#endif /* DIAGNOSTIC */ 121 122 /* 123 * IRQ_INSTRUCT indicates that we should get the irq number 124 * from the irq structure 125 */ 126 if (irq == IRQ_INSTRUCT) 127 irq = handler->ih_num; 128 129 /* Make sure the irq number is valid */ 130 if (irq < 0 || irq >= NIRQS) 131 return(-1); 132 133 /* Make sure the level is valid */ 134 if (handler->ih_level < 0 || handler->ih_level >= NIPL) 135 return(-1); 136 137 evcnt_attach_dynamic(&handler->ih_ev, EVCNT_TYPE_INTR, NULL, 138 group, name); 139 140 /* Attach handler at top of chain */ 141 handler->ih_next = irqhandlers[irq]; 142 irqhandlers[irq] = handler; 143 144 /* 145 * Reset the flags for this handler. 146 * As the handler is now in the chain mark it as active. 147 */ 148 handler->ih_flags = 0 | IRQ_FLAG_ACTIVE; 149 150 /* 151 * Record the interrupt number for accounting. 152 * Done here as the accounting number may not be the same as the 153 * IRQ number though for the moment they are 154 */ 155 handler->ih_num = irq; 156 157 /* 158 * Update the irq masks. 159 * Find the lowest interrupt priority on the irq chain. 160 * Interrupt is allowable at priorities lower than this. 161 * If ih_level is out of range then don't bother to update 162 * the masks. 163 */ 164 if (handler->ih_level >= 0 && handler->ih_level < NIPL) { 165 irqhandler_t *ptr; 166 167 /* 168 * Find the lowest interrupt priority on the irq chain. 169 * Interrupt is allowable at priorities lower than this. 170 */ 171 ptr = irqhandlers[irq]; 172 if (ptr) { 173 level = ptr->ih_level - 1; 174 while (ptr) { 175 if (ptr->ih_level - 1 < level) 176 level = ptr->ih_level - 1; 177 ptr = ptr->ih_next; 178 } 179 while (level >= 0) { 180 irqmasks[level] |= (1 << irq); 181 --level; 182 } 183 } 184 185#include "sl.h" 186#include "ppp.h" 187#if NSL > 0 || NPPP > 0 188 /* In the presence of SLIP or PPP, splimp > spltty. */ 189 irqmasks[IPL_NET] &= irqmasks[IPL_TTY]; 190#endif 191 } 192 193 enable_irq(irq); 194 set_spl_masks(); 195 196 return(0); 197} 198 199 200/* 201 * int irq_release(int irq, irqhandler_t *handler) 202 * 203 * Disable an IRQ and remove a handler for it. 204 */ 205 206int 207irq_release(int irq, irqhandler_t *handler) 208{ 209 int level; 210 irqhandler_t *irqhand; 211 irqhandler_t **prehand; 212 213 /* 214 * IRQ_INSTRUCT indicates that we should get the irq number 215 * from the irq structure 216 */ 217 if (irq == IRQ_INSTRUCT) 218 irq = handler->ih_num; 219 220 /* Make sure the irq number is valid */ 221 if (irq < 0 || irq >= NIRQS) 222 return(-1); 223 224 /* Locate the handler */ 225 irqhand = irqhandlers[irq]; 226 prehand = &irqhandlers[irq]; 227 228 while (irqhand && handler != irqhand) { 229 prehand = &irqhand; 230 irqhand = irqhand->ih_next; 231 } 232 233 /* Remove the handler if located */ 234 if (irqhand) 235 *prehand = irqhand->ih_next; 236 else 237 return(-1); 238 239 /* Now the handler has been removed from the chain mark is as inactive */ 240 irqhand->ih_flags &= ~IRQ_FLAG_ACTIVE; 241 242 /* Make sure the head of the handler list is active */ 243 if (irqhandlers[irq]) 244 irqhandlers[irq]->ih_flags |= IRQ_FLAG_ACTIVE; 245 246 /* 247 * Update the irq masks. 248 * If ih_level is out of range then don't bother to update 249 * the masks. 250 */ 251 if (handler->ih_level >= 0 && handler->ih_level < NIPL) { 252 irqhandler_t *ptr; 253 254 /* Clean the bit from all the masks */ 255 for (level = 0; level < NIPL; ++level) 256 irqmasks[level] &= ~(1 << irq); 257 258 /* 259 * Find the lowest interrupt priority on the irq chain. 260 * Interrupt is allowable at priorities lower than this. 261 */ 262 ptr = irqhandlers[irq]; 263 if (ptr) { 264 level = ptr->ih_level - 1; 265 while (ptr) { 266 if (ptr->ih_level - 1 < level) 267 level = ptr->ih_level - 1; 268 ptr = ptr->ih_next; 269 } 270 while (level >= 0) { 271 irqmasks[level] |= (1 << irq); 272 --level; 273 } 274 } 275 } 276 277 /* 278 * Disable the appropriate mask bit if there are no handlers left for 279 * this IRQ. 280 */ 281 if (irqhandlers[irq] == NULL) 282 disable_irq(irq); 283 284 set_spl_masks(); 285 286 return(0); 287} 288 289 290void * 291intr_claim(int irq, int level, int (*ih_func)(void *), void *ih_arg, const char *group, const char *name) 292{ 293 irqhandler_t *ih; 294 295 ih = kmem_zalloc(sizeof(*ih), KM_SLEEP); 296 ih->ih_level = level; 297 ih->ih_func = ih_func; 298 ih->ih_arg = ih_arg; 299 ih->ih_flags = 0; 300 301 if (irq_claim(irq, ih, group, name) != 0) { 302 kmem_free(ih, sizeof(*ih)); 303 return(NULL); 304 } 305 return(ih); 306} 307 308 309int 310intr_release(void *arg) 311{ 312 irqhandler_t *ih = (irqhandler_t *)arg; 313 314 if (irq_release(ih->ih_num, ih) == 0) { 315 kmem_free(ih, sizeof(*ih)); 316 return(0); 317 } 318 return(1); 319} 320 321 322/* 323 * void disable_irq(int irq) 324 * 325 * Disables a specific irq. The irq is removed from the master irq mask 326 */ 327 328void 329disable_irq(int irq) 330{ 331 register int oldirqstate; 332 333 oldirqstate = disable_interrupts(I32_bit); 334 current_mask &= ~(1 << irq); 335 irq_setmasks(); 336 restore_interrupts(oldirqstate); 337} 338 339 340/* 341 * void enable_irq(int irq) 342 * 343 * Enables a specific irq. The irq is added to the master irq mask 344 * This routine should be used with caution. A handler should already 345 * be installed. 346 */ 347 348void 349enable_irq(int irq) 350{ 351 register u_int oldirqstate; 352 353 oldirqstate = disable_interrupts(I32_bit); 354 current_mask |= (1 << irq); 355 irq_setmasks(); 356 restore_interrupts(oldirqstate); 357} 358 359 360/* 361 * void stray_irqhandler(u_int mask) 362 * 363 * Handler for stray interrupts. This gets called if a handler cannot be 364 * found for an interrupt. 365 */ 366 367void stray_irqhandler(u_int); /* called from assembly */ 368 369void 370stray_irqhandler(u_int mask) 371{ 372 static u_int stray_irqs = 0; 373 374 if (++stray_irqs <= 8) 375 log(LOG_ERR, "Stray interrupt %08x%s\n", mask, 376 stray_irqs >= 8 ? ": stopped logging" : ""); 377} 378