1 /* 2 * arch/m68k/q40/q40ints.c 3 * 4 * Copyright (C) 1999,2001 Richard Zidlicky 5 * 6 * This file is subject to the terms and conditions of the GNU General Public 7 * License. See the file COPYING in the main directory of this archive 8 * for more details. 9 * 10 * .. used to be loosely based on bvme6000ints.c 11 * 12 */ 13 14 #include <linux/types.h> 15 #include <linux/kernel.h> 16 #include <linux/errno.h> 17 #include <linux/string.h> 18 #include <linux/sched.h> 19 #include <linux/seq_file.h> 20 #include <linux/interrupt.h> 21 #include <linux/hardirq.h> 22 23 #include <asm/rtc.h> 24 #include <asm/ptrace.h> 25 #include <asm/system.h> 26 #include <asm/irq.h> 27 #include <asm/traps.h> 28 29 #include <asm/q40_master.h> 30 #include <asm/q40ints.h> 31 32 /* 33 * Q40 IRQs are defined as follows: 34 * 3,4,5,6,7,10,11,14,15 : ISA dev IRQs 35 * 16-31: reserved 36 * 32 : keyboard int 37 * 33 : frame int (50/200 Hz periodic timer) 38 * 34 : sample int (10/20 KHz periodic timer) 39 * 40 */ 41 42 extern int ints_inited; 43 44 45 irqreturn_t q40_irq2_handler (int, void *, struct pt_regs *fp); 46 47 48 static irqreturn_t q40_defhand (int irq, void *dev_id, struct pt_regs *fp); 49 static irqreturn_t default_handler(int lev, void *dev_id, struct pt_regs *regs); 50 51 52 #define DEVNAME_SIZE 24 53 54 static struct q40_irq_node { 55 irqreturn_t (*handler)(int, void *, struct pt_regs *); 56 unsigned long flags; 57 void *dev_id; 58 /* struct q40_irq_node *next;*/ 59 char devname[DEVNAME_SIZE]; 60 unsigned count; 61 unsigned short state; 62 } irq_tab[Q40_IRQ_MAX+1]; 63 64 short unsigned q40_ablecount[Q40_IRQ_MAX+1]; 65 66 /* 67 * void q40_init_IRQ (void) 68 * 69 * Parameters: None 70 * 71 * Returns: Nothing 72 * 73 * This function is called during kernel startup to initialize 74 * the q40 IRQ handling routines. 75 */ 76 77 static int disabled=0; 78 79 void q40_init_IRQ (void) 80 { 81 int i; 82 83 disabled=0; 84 for (i = 0; i <= Q40_IRQ_MAX; i++) { 85 irq_tab[i].handler = q40_defhand; 86 irq_tab[i].flags = 0; 87 irq_tab[i].dev_id = NULL; 88 /* irq_tab[i].next = NULL;*/ 89 irq_tab[i].devname[0] = 0; 90 irq_tab[i].count = 0; 91 irq_tab[i].state =0; 92 q40_ablecount[i]=0; /* all enabled */ 93 } 94 95 /* setup handler for ISA ints */ 96 cpu_request_irq(IRQ2, q40_irq2_handler, 0, "q40 ISA and master chip", 97 NULL); 98 99 /* now enable some ints.. */ 100 master_outb(1,EXT_ENABLE_REG); /* ISA IRQ 5-15 */ 101 102 /* make sure keyboard IRQ is disabled */ 103 master_outb(0,KEY_IRQ_ENABLE_REG); 104 } 105 106 int q40_request_irq(unsigned int irq, 107 irqreturn_t (*handler)(int, void *, struct pt_regs *), 108 unsigned long flags, const char *devname, void *dev_id) 109 { 110 /*printk("q40_request_irq %d, %s\n",irq,devname);*/ 111 112 if (irq > Q40_IRQ_MAX || (irq>15 && irq<32)) { 113 printk("%s: Incorrect IRQ %d from %s\n", __FUNCTION__, irq, devname); 114 return -ENXIO; 115 } 116 117 /* test for ISA ints not implemented by HW */ 118 switch (irq) 119 { 120 case 1: case 2: case 8: case 9: 121 case 12: case 13: 122 printk("%s: ISA IRQ %d from %s not implemented by HW\n", __FUNCTION__, irq, devname); 123 return -ENXIO; 124 case 11: 125 printk("warning IRQ 10 and 11 not distinguishable\n"); 126 irq=10; 127 default: 128 ; 129 } 130 131 if (irq<Q40_IRQ_SAMPLE) 132 { 133 if (irq_tab[irq].dev_id != NULL) 134 { 135 printk("%s: IRQ %d from %s is not replaceable\n", 136 __FUNCTION__, irq, irq_tab[irq].devname); 137 return -EBUSY; 138 } 139 /*printk("IRQ %d set to handler %p\n",irq,handler);*/ 140 if (dev_id==NULL) 141 { 142 printk("WARNING: dev_id == NULL in request_irq\n"); 143 dev_id=(void*)1; 144 } 145 irq_tab[irq].handler = handler; 146 irq_tab[irq].flags = flags; 147 irq_tab[irq].dev_id = dev_id; 148 strlcpy(irq_tab[irq].devname,devname,sizeof(irq_tab[irq].devname)); 149 irq_tab[irq].state = 0; 150 return 0; 151 } 152 else { 153 /* Q40_IRQ_SAMPLE :somewhat special actions required here ..*/ 154 cpu_request_irq(4, handler, flags, devname, dev_id); 155 cpu_request_irq(6, handler, flags, devname, dev_id); 156 return 0; 157 } 158 } 159 160 void q40_free_irq(unsigned int irq, void *dev_id) 161 { 162 if (irq > Q40_IRQ_MAX || (irq>15 && irq<32)) { 163 printk("%s: Incorrect IRQ %d, dev_id %x \n", __FUNCTION__, irq, (unsigned)dev_id); 164 return; 165 } 166 167 /* test for ISA ints not implemented by HW */ 168 switch (irq) 169 { 170 case 1: case 2: case 8: case 9: 171 case 12: case 13: 172 printk("%s: ISA IRQ %d from %x invalid\n", __FUNCTION__, irq, (unsigned)dev_id); 173 return; 174 case 11: irq=10; 175 default: 176 ; 177 } 178 179 if (irq<Q40_IRQ_SAMPLE) 180 { 181 if (irq_tab[irq].dev_id != dev_id) 182 printk("%s: Removing probably wrong IRQ %d from %s\n", 183 __FUNCTION__, irq, irq_tab[irq].devname); 184 185 irq_tab[irq].handler = q40_defhand; 186 irq_tab[irq].flags = 0; 187 irq_tab[irq].dev_id = NULL; 188 /* irq_tab[irq].devname = NULL; */ 189 /* do not reset state !! */ 190 } 191 else 192 { /* == Q40_IRQ_SAMPLE */ 193 cpu_free_irq(4, dev_id); 194 cpu_free_irq(6, dev_id); 195 } 196 } 197 198 199 irqreturn_t q40_process_int (int level, struct pt_regs *fp) 200 { 201 printk("unexpected interrupt vec=%x, pc=%lx, d0=%lx, d0_orig=%lx, d1=%lx, d2=%lx\n", 202 level, fp->pc, fp->d0, fp->orig_d0, fp->d1, fp->d2); 203 printk("\tIIRQ_REG = %x, EIRQ_REG = %x\n",master_inb(IIRQ_REG),master_inb(EIRQ_REG)); 204 return IRQ_HANDLED; 205 } 206 207 /* 208 * this stuff doesn't really belong here.. 209 */ 210 211 int ql_ticks; /* 200Hz ticks since last jiffie */ 212 static int sound_ticks; 213 214 #define SVOL 45 215 216 void q40_mksound(unsigned int hz, unsigned int ticks) 217 { 218 /* for now ignore hz, except that hz==0 switches off sound */ 219 /* simply alternate the ampl (128-SVOL)-(128+SVOL)-..-.. at 200Hz */ 220 if (hz==0) 221 { 222 if (sound_ticks) 223 sound_ticks=1; 224 225 *DAC_LEFT=128; 226 *DAC_RIGHT=128; 227 228 return; 229 } 230 /* sound itself is done in q40_timer_int */ 231 if (sound_ticks == 0) sound_ticks=1000; /* pretty long beep */ 232 sound_ticks=ticks<<1; 233 } 234 235 static irqreturn_t (*q40_timer_routine)(int, void *, struct pt_regs *); 236 237 static irqreturn_t q40_timer_int (int irq, void * dev, struct pt_regs * regs) 238 { 239 ql_ticks = ql_ticks ? 0 : 1; 240 if (sound_ticks) 241 { 242 unsigned char sval=(sound_ticks & 1) ? 128-SVOL : 128+SVOL; 243 sound_ticks--; 244 *DAC_LEFT=sval; 245 *DAC_RIGHT=sval; 246 } 247 248 if (!ql_ticks) 249 q40_timer_routine(irq, dev, regs); 250 return IRQ_HANDLED; 251 } 252 253 void q40_sched_init (irqreturn_t (*timer_routine)(int, void *, struct pt_regs *)) 254 { 255 int timer_irq; 256 257 q40_timer_routine = timer_routine; 258 timer_irq=Q40_IRQ_FRAME; 259 260 if (request_irq(timer_irq, q40_timer_int, 0, 261 "timer", q40_timer_int)) 262 panic ("Couldn't register timer int"); 263 264 master_outb(-1,FRAME_CLEAR_REG); 265 master_outb( 1,FRAME_RATE_REG); 266 } 267 268 269 /* 270 * tables to translate bits into IRQ numbers 271 * it is a good idea to order the entries by priority 272 * 273 */ 274 275 struct IRQ_TABLE{ unsigned mask; int irq ;}; 276 #if 0 277 static struct IRQ_TABLE iirqs[]={ 278 {Q40_IRQ_FRAME_MASK,Q40_IRQ_FRAME}, 279 {Q40_IRQ_KEYB_MASK,Q40_IRQ_KEYBOARD}, 280 {0,0}}; 281 #endif 282 static struct IRQ_TABLE eirqs[] = { 283 { .mask = Q40_IRQ3_MASK, .irq = 3 }, /* ser 1 */ 284 { .mask = Q40_IRQ4_MASK, .irq = 4 }, /* ser 2 */ 285 { .mask = Q40_IRQ14_MASK, .irq = 14 }, /* IDE 1 */ 286 { .mask = Q40_IRQ15_MASK, .irq = 15 }, /* IDE 2 */ 287 { .mask = Q40_IRQ6_MASK, .irq = 6 }, /* floppy, handled elsewhere */ 288 { .mask = Q40_IRQ7_MASK, .irq = 7 }, /* par */ 289 { .mask = Q40_IRQ5_MASK, .irq = 5 }, 290 { .mask = Q40_IRQ10_MASK, .irq = 10 }, 291 {0,0} 292 }; 293 294 /* complain only this many times about spurious ints : */ 295 static int ccleirq=60; /* ISA dev IRQ's*/ 296 /*static int cclirq=60;*/ /* internal */ 297 298 /* FIXME: add shared ints,mask,unmask,probing.... */ 299 300 #define IRQ_INPROGRESS 1 301 /*static unsigned short saved_mask;*/ 302 //static int do_tint=0; 303 304 #define DEBUG_Q40INT 305 /*#define IP_USE_DISABLE *//* would be nice, but crashes ???? */ 306 307 static int mext_disabled=0; /* ext irq disabled by master chip? */ 308 static int aliased_irq=0; /* how many times inside handler ?*/ 309 310 311 /* got level 2 interrupt, dispatch to ISA or keyboard/timer IRQs */ 312 irqreturn_t q40_irq2_handler (int vec, void *devname, struct pt_regs *fp) 313 { 314 unsigned mir, mer; 315 int irq,i; 316 317 //repeat: 318 mir=master_inb(IIRQ_REG); 319 if (mir&Q40_IRQ_FRAME_MASK) { 320 irq_tab[Q40_IRQ_FRAME].count++; 321 irq_tab[Q40_IRQ_FRAME].handler(Q40_IRQ_FRAME,irq_tab[Q40_IRQ_FRAME].dev_id,fp); 322 master_outb(-1,FRAME_CLEAR_REG); 323 } 324 if ((mir&Q40_IRQ_SER_MASK) || (mir&Q40_IRQ_EXT_MASK)) { 325 mer=master_inb(EIRQ_REG); 326 for (i=0; eirqs[i].mask; i++) { 327 if (mer&(eirqs[i].mask)) { 328 irq=eirqs[i].irq; 329 /* 330 * There is a little mess wrt which IRQ really caused this irq request. The 331 * main problem is that IIRQ_REG and EIRQ_REG reflect the state when they 332 * are read - which is long after the request came in. In theory IRQs should 333 * not just go away but they occassionally do 334 */ 335 if (irq>4 && irq<=15 && mext_disabled) { 336 /*aliased_irq++;*/ 337 goto iirq; 338 } 339 if (irq_tab[irq].handler == q40_defhand ) { 340 printk("handler for IRQ %d not defined\n",irq); 341 continue; /* ignore uninited INTs :-( */ 342 } 343 if ( irq_tab[irq].state & IRQ_INPROGRESS ) { 344 /* some handlers do local_irq_enable() for irq latency reasons, */ 345 /* however reentering an active irq handler is not permitted */ 346 #ifdef IP_USE_DISABLE 347 /* in theory this is the better way to do it because it still */ 348 /* lets through eg the serial irqs, unfortunately it crashes */ 349 disable_irq(irq); 350 disabled=1; 351 #else 352 /*printk("IRQ_INPROGRESS detected for irq %d, disabling - %s disabled\n",irq,disabled ? "already" : "not yet"); */ 353 fp->sr = (((fp->sr) & (~0x700))+0x200); 354 disabled=1; 355 #endif 356 goto iirq; 357 } 358 irq_tab[irq].count++; 359 irq_tab[irq].state |= IRQ_INPROGRESS; 360 irq_tab[irq].handler(irq,irq_tab[irq].dev_id,fp); 361 irq_tab[irq].state &= ~IRQ_INPROGRESS; 362 363 /* naively enable everything, if that fails than */ 364 /* this function will be reentered immediately thus */ 365 /* getting another chance to disable the IRQ */ 366 367 if ( disabled ) { 368 #ifdef IP_USE_DISABLE 369 if (irq>4){ 370 disabled=0; 371 enable_irq(irq);} 372 #else 373 disabled=0; 374 /*printk("reenabling irq %d\n",irq); */ 375 #endif 376 } 377 // used to do 'goto repeat;' here, this delayed bh processing too long 378 return IRQ_HANDLED; 379 } 380 } 381 if (mer && ccleirq>0 && !aliased_irq) 382 printk("ISA interrupt from unknown source? EIRQ_REG = %x\n",mer),ccleirq--; 383 } 384 iirq: 385 mir=master_inb(IIRQ_REG); 386 /* should test whether keyboard irq is really enabled, doing it in defhand */ 387 if (mir&Q40_IRQ_KEYB_MASK) { 388 irq_tab[Q40_IRQ_KEYBOARD].count++; 389 irq_tab[Q40_IRQ_KEYBOARD].handler(Q40_IRQ_KEYBOARD,irq_tab[Q40_IRQ_KEYBOARD].dev_id,fp); 390 } 391 return IRQ_HANDLED; 392 } 393 394 int show_q40_interrupts (struct seq_file *p, void *v) 395 { 396 int i; 397 398 for (i = 0; i <= Q40_IRQ_MAX; i++) { 399 if (irq_tab[i].count) 400 seq_printf(p, "%sIRQ %02d: %8d %s%s\n", 401 (i<=15) ? "ISA-" : " " , 402 i, irq_tab[i].count, 403 irq_tab[i].devname[0] ? irq_tab[i].devname : "?", 404 irq_tab[i].handler == q40_defhand ? 405 " (now unassigned)" : ""); 406 } 407 return 0; 408 } 409 410 411 static irqreturn_t q40_defhand (int irq, void *dev_id, struct pt_regs *fp) 412 { 413 if (irq!=Q40_IRQ_KEYBOARD) 414 printk ("Unknown q40 interrupt %d\n", irq); 415 else master_outb(-1,KEYBOARD_UNLOCK_REG); 416 return IRQ_NONE; 417 } 418 static irqreturn_t default_handler(int lev, void *dev_id, struct pt_regs *regs) 419 { 420 printk ("Uninitialised interrupt level %d\n", lev); 421 return IRQ_NONE; 422 } 423 424 irqreturn_t (*q40_default_handler[SYS_IRQS])(int, void *, struct pt_regs *) = { 425 [0] = default_handler, 426 [1] = default_handler, 427 [2] = default_handler, 428 [3] = default_handler, 429 [4] = default_handler, 430 [5] = default_handler, 431 [6] = default_handler, 432 [7] = default_handler 433 }; 434 435 436 void q40_enable_irq (unsigned int irq) 437 { 438 if ( irq>=5 && irq<=15 ) 439 { 440 mext_disabled--; 441 if (mext_disabled>0) 442 printk("q40_enable_irq : nested disable/enable\n"); 443 if (mext_disabled==0) 444 master_outb(1,EXT_ENABLE_REG); 445 } 446 } 447 448 449 void q40_disable_irq (unsigned int irq) 450 { 451 /* disable ISA iqs : only do something if the driver has been 452 * verified to be Q40 "compatible" - right now IDE, NE2K 453 * Any driver should not attempt to sleep across disable_irq !! 454 */ 455 456 if ( irq>=5 && irq<=15 ) { 457 master_outb(0,EXT_ENABLE_REG); 458 mext_disabled++; 459 if (mext_disabled>1) printk("disable_irq nesting count %d\n",mext_disabled); 460 } 461 } 462 463 unsigned long q40_probe_irq_on (void) 464 { 465 printk("irq probing not working - reconfigure the driver to avoid this\n"); 466 return -1; 467 } 468 int q40_probe_irq_off (unsigned long irqs) 469 { 470 return -1; 471 } 472 /* 473 * Local variables: 474 * compile-command: "m68k-linux-gcc -D__KERNEL__ -I/home/rz/lx/linux-2.2.6/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -ffixed-a2 -m68040 -c -o q40ints.o q40ints.c" 475 * End: 476 */ 477