git.oblomov.eu Git - linux-2.6/blob - arch/mips/au1000/common/irq.c

   1 /*
   2  * BRIEF MODULE DESCRIPTION
   3  *      Au1000 interrupt routines.
   4  *
   5  * Copyright 2001 MontaVista Software Inc.
   6  * Author: MontaVista Software, Inc.
   7  *              ppopov@mvista.com or source@mvista.com
   8  *
   9  *  This program is free software; you can redistribute  it and/or modify it
  10  *  under  the terms of  the GNU General  Public License as published by the
  11  *  Free Software Foundation;  either version 2 of the  License, or (at your
  12  *  option) any later version.
  13  *
  14  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
  15  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
  16  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  17  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
  18  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
  20  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  21  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
  22  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  *
  25  *  You should have received a copy of the  GNU General Public License along
  26  *  with this program; if not, write  to the Free Software Foundation, Inc.,
  27  *  675 Mass Ave, Cambridge, MA 02139, USA.
  28  */
  29 #include <linux/errno.h>
  30 #include <linux/init.h>
  31 #include <linux/irq.h>
  32 #include <linux/kernel_stat.h>
  33 #include <linux/module.h>
  34 #include <linux/signal.h>
  35 #include <linux/sched.h>
  36 #include <linux/types.h>
  37 #include <linux/interrupt.h>
  38 #include <linux/ioport.h>
  39 #include <linux/timex.h>
  40 #include <linux/slab.h>
  41 #include <linux/random.h>
  42 #include <linux/delay.h>
  43 #include <linux/bitops.h>
  44
  45 #include <asm/bootinfo.h>
  46 #include <asm/io.h>
  47 #include <asm/mipsregs.h>
  48 #include <asm/system.h>
  49 #include <asm/mach-au1x00/au1000.h>
  50 #ifdef CONFIG_MIPS_PB1000
  51 #include <asm/mach-pb1x00/pb1000.h>
  52 #endif
  53
  54 #undef DEBUG_IRQ
  55 #ifdef DEBUG_IRQ
  56 /* note: prints function name for you */
  57 #define DPRINTK(fmt, args...) printk("%s: " fmt, __FUNCTION__ , ## args)
  58 #else
  59 #define DPRINTK(fmt, args...)
  60 #endif
  61
  62 #define EXT_INTC0_REQ0 2 /* IP 2 */
  63 #define EXT_INTC0_REQ1 3 /* IP 3 */
  64 #define EXT_INTC1_REQ0 4 /* IP 4 */
  65 #define EXT_INTC1_REQ1 5 /* IP 5 */
  66 #define MIPS_TIMER_IP  7 /* IP 7 */
  67
  68 extern void set_debug_traps(void);
  69 extern irq_cpustat_t irq_stat [NR_CPUS];
  70 extern void mips_timer_interrupt(void);
  71
  72 static void setup_local_irq(unsigned int irq, int type, int int_req);
  73 static void end_irq(unsigned int irq_nr);
  74 static inline void mask_and_ack_level_irq(unsigned int irq_nr);
  75 static inline void mask_and_ack_rise_edge_irq(unsigned int irq_nr);
  76 static inline void mask_and_ack_fall_edge_irq(unsigned int irq_nr);
  77 static inline void mask_and_ack_either_edge_irq(unsigned int irq_nr);
  78 inline void local_enable_irq(unsigned int irq_nr);
  79 inline void local_disable_irq(unsigned int irq_nr);
  80
  81 void    (*board_init_irq)(void);
  82
  83 static DEFINE_SPINLOCK(irq_lock);
  84
  85
  86 inline void local_enable_irq(unsigned int irq_nr)
  87 {
  88         if (irq_nr > AU1000_LAST_INTC0_INT) {
  89                 au_writel(1<<(irq_nr-32), IC1_MASKSET);
  90                 au_writel(1<<(irq_nr-32), IC1_WAKESET);
  91         }
  92         else {
  93                 au_writel(1<<irq_nr, IC0_MASKSET);
  94                 au_writel(1<<irq_nr, IC0_WAKESET);
  95         }
  96         au_sync();
  97 }
  98
  99
 100 inline void local_disable_irq(unsigned int irq_nr)
 101 {
 102         if (irq_nr > AU1000_LAST_INTC0_INT) {
 103                 au_writel(1<<(irq_nr-32), IC1_MASKCLR);
 104                 au_writel(1<<(irq_nr-32), IC1_WAKECLR);
 105         }
 106         else {
 107                 au_writel(1<<irq_nr, IC0_MASKCLR);
 108                 au_writel(1<<irq_nr, IC0_WAKECLR);
 109         }
 110         au_sync();
 111 }
 112
 113
 114 static inline void mask_and_ack_rise_edge_irq(unsigned int irq_nr)
 115 {
 116         if (irq_nr > AU1000_LAST_INTC0_INT) {
 117                 au_writel(1<<(irq_nr-32), IC1_RISINGCLR);
 118                 au_writel(1<<(irq_nr-32), IC1_MASKCLR);
 119         }
 120         else {
 121                 au_writel(1<<irq_nr, IC0_RISINGCLR);
 122                 au_writel(1<<irq_nr, IC0_MASKCLR);
 123         }
 124         au_sync();
 125 }
 126
 127
 128 static inline void mask_and_ack_fall_edge_irq(unsigned int irq_nr)
 129 {
 130         if (irq_nr > AU1000_LAST_INTC0_INT) {
 131                 au_writel(1<<(irq_nr-32), IC1_FALLINGCLR);
 132                 au_writel(1<<(irq_nr-32), IC1_MASKCLR);
 133         }
 134         else {
 135                 au_writel(1<<irq_nr, IC0_FALLINGCLR);
 136                 au_writel(1<<irq_nr, IC0_MASKCLR);
 137         }
 138         au_sync();
 139 }
 140
 141
 142 static inline void mask_and_ack_either_edge_irq(unsigned int irq_nr)
 143 {
 144         /* This may assume that we don't get interrupts from
 145          * both edges at once, or if we do, that we don't care.
 146          */
 147         if (irq_nr > AU1000_LAST_INTC0_INT) {
 148                 au_writel(1<<(irq_nr-32), IC1_FALLINGCLR);
 149                 au_writel(1<<(irq_nr-32), IC1_RISINGCLR);
 150                 au_writel(1<<(irq_nr-32), IC1_MASKCLR);
 151         }
 152         else {
 153                 au_writel(1<<irq_nr, IC0_FALLINGCLR);
 154                 au_writel(1<<irq_nr, IC0_RISINGCLR);
 155                 au_writel(1<<irq_nr, IC0_MASKCLR);
 156         }
 157         au_sync();
 158 }
 159
 160
 161 static inline void mask_and_ack_level_irq(unsigned int irq_nr)
 162 {
 163
 164         local_disable_irq(irq_nr);
 165         au_sync();
 166 #if defined(CONFIG_MIPS_PB1000)
 167         if (irq_nr == AU1000_GPIO_15) {
 168                 au_writel(0x8000, PB1000_MDR); /* ack int */
 169                 au_sync();
 170         }
 171 #endif
 172         return;
 173 }
 174
 175
 176 static void end_irq(unsigned int irq_nr)
 177 {
 178         if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS))) {
 179                 local_enable_irq(irq_nr);
 180         }
 181 #if defined(CONFIG_MIPS_PB1000)
 182         if (irq_nr == AU1000_GPIO_15) {
 183                 au_writel(0x4000, PB1000_MDR); /* enable int */
 184                 au_sync();
 185         }
 186 #endif
 187 }
 188
 189 unsigned long save_local_and_disable(int controller)
 190 {
 191         int i;
 192         unsigned long flags, mask;
 193
 194         spin_lock_irqsave(&irq_lock, flags);
 195         if (controller) {
 196                 mask = au_readl(IC1_MASKSET);
 197                 for (i=32; i<64; i++) {
 198                         local_disable_irq(i);
 199                 }
 200         }
 201         else {
 202                 mask = au_readl(IC0_MASKSET);
 203                 for (i=0; i<32; i++) {
 204                         local_disable_irq(i);
 205                 }
 206         }
 207         spin_unlock_irqrestore(&irq_lock, flags);
 208
 209         return mask;
 210 }
 211
 212 void restore_local_and_enable(int controller, unsigned long mask)
 213 {
 214         int i;
 215         unsigned long flags, new_mask;
 216
 217         spin_lock_irqsave(&irq_lock, flags);
 218         for (i=0; i<32; i++) {
 219                 if (mask & (1<<i)) {
 220                         if (controller)
 221                                 local_enable_irq(i+32);
 222                         else
 223                                 local_enable_irq(i);
 224                 }
 225         }
 226         if (controller)
 227                 new_mask = au_readl(IC1_MASKSET);
 228         else
 229                 new_mask = au_readl(IC0_MASKSET);
 230
 231         spin_unlock_irqrestore(&irq_lock, flags);
 232 }
 233
 234
 235 static struct irq_chip rise_edge_irq_type = {
 236         .name = "Au1000 Rise Edge",
 237         .ack = mask_and_ack_rise_edge_irq,
 238         .mask = local_disable_irq,
 239         .mask_ack = mask_and_ack_rise_edge_irq,
 240         .unmask = local_enable_irq,
 241         .end = end_irq,
 242 };
 243
 244 static struct irq_chip fall_edge_irq_type = {
 245         .name = "Au1000 Fall Edge",
 246         .ack = mask_and_ack_fall_edge_irq,
 247         .mask = local_disable_irq,
 248         .mask_ack = mask_and_ack_fall_edge_irq,
 249         .unmask = local_enable_irq,
 250         .end = end_irq,
 251 };
 252
 253 static struct irq_chip either_edge_irq_type = {
 254         .name = "Au1000 Rise or Fall Edge",
 255         .ack = mask_and_ack_either_edge_irq,
 256         .mask = local_disable_irq,
 257         .mask_ack = mask_and_ack_either_edge_irq,
 258         .unmask = local_enable_irq,
 259         .end = end_irq,
 260 };
 261
 262 static struct irq_chip level_irq_type = {
 263         .name = "Au1000 Level",
 264         .ack = mask_and_ack_level_irq,
 265         .mask = local_disable_irq,
 266         .mask_ack = mask_and_ack_level_irq,
 267         .unmask = local_enable_irq,
 268         .end = end_irq,
 269 };
 270
 271 #ifdef CONFIG_PM
 272 void startup_match20_interrupt(irq_handler_t handler)
 273 {
 274         struct irq_desc *desc = &irq_desc[AU1000_TOY_MATCH2_INT];
 275
 276         static struct irqaction action;
 277         memset(&action, 0, sizeof(struct irqaction));
 278
 279         /* This is a big problem.... since we didn't use request_irq
 280          * when kernel/irq.c calls probe_irq_xxx this interrupt will
 281          * be probed for usage. This will end up disabling the device :(
 282          * Give it a bogus "action" pointer -- this will keep it from
 283          * getting auto-probed!
 284          *
 285          * By setting the status to match that of request_irq() we
 286          * can avoid it.  --cgray
 287         */
 288         action.dev_id = handler;
 289         action.flags = IRQF_DISABLED;
 290         cpus_clear(action.mask);
 291         action.name = "Au1xxx TOY";
 292         action.handler = handler;
 293         action.next = NULL;
 294
 295         desc->action = &action;
 296         desc->status &= ~(IRQ_DISABLED | IRQ_AUTODETECT | IRQ_WAITING | IRQ_INPROGRESS);
 297
 298         local_enable_irq(AU1000_TOY_MATCH2_INT);
 299 }
 300 #endif
 301
 302 static void setup_local_irq(unsigned int irq_nr, int type, int int_req)
 303 {
 304         if (irq_nr > AU1000_MAX_INTR) return;
 305         /* Config2[n], Config1[n], Config0[n] */
 306         if (irq_nr > AU1000_LAST_INTC0_INT) {
 307                 switch (type) {
 308                         case INTC_INT_RISE_EDGE: /* 0:0:1 */
 309                                 au_writel(1<<(irq_nr-32), IC1_CFG2CLR);
 310                                 au_writel(1<<(irq_nr-32), IC1_CFG1CLR);
 311                                 au_writel(1<<(irq_nr-32), IC1_CFG0SET);
 312                                 set_irq_chip(irq_nr, &rise_edge_irq_type);
 313                                 break;
 314                         case INTC_INT_FALL_EDGE: /* 0:1:0 */
 315                                 au_writel(1<<(irq_nr-32), IC1_CFG2CLR);
 316                                 au_writel(1<<(irq_nr-32), IC1_CFG1SET);
 317                                 au_writel(1<<(irq_nr-32), IC1_CFG0CLR);
 318                                 set_irq_chip(irq_nr, &fall_edge_irq_type);
 319                                 break;
 320                         case INTC_INT_RISE_AND_FALL_EDGE: /* 0:1:1 */
 321                                 au_writel(1<<(irq_nr-32), IC1_CFG2CLR);
 322                                 au_writel(1<<(irq_nr-32), IC1_CFG1SET);
 323                                 au_writel(1<<(irq_nr-32), IC1_CFG0SET);
 324                                 set_irq_chip(irq_nr, &either_edge_irq_type);
 325                                 break;
 326                         case INTC_INT_HIGH_LEVEL: /* 1:0:1 */
 327                                 au_writel(1<<(irq_nr-32), IC1_CFG2SET);
 328                                 au_writel(1<<(irq_nr-32), IC1_CFG1CLR);
 329                                 au_writel(1<<(irq_nr-32), IC1_CFG0SET);
 330                                 set_irq_chip(irq_nr, &level_irq_type);
 331                                 break;
 332                         case INTC_INT_LOW_LEVEL: /* 1:1:0 */
 333                                 au_writel(1<<(irq_nr-32), IC1_CFG2SET);
 334                                 au_writel(1<<(irq_nr-32), IC1_CFG1SET);
 335                                 au_writel(1<<(irq_nr-32), IC1_CFG0CLR);
 336                                 set_irq_chip(irq_nr, &level_irq_type);
 337                                 break;
 338                         case INTC_INT_DISABLED: /* 0:0:0 */
 339                                 au_writel(1<<(irq_nr-32), IC1_CFG0CLR);
 340                                 au_writel(1<<(irq_nr-32), IC1_CFG1CLR);
 341                                 au_writel(1<<(irq_nr-32), IC1_CFG2CLR);
 342                                 break;
 343                         default: /* disable the interrupt */
 344                                 printk("unexpected int type %d (irq %d)\n", type, irq_nr);
 345                                 au_writel(1<<(irq_nr-32), IC1_CFG0CLR);
 346                                 au_writel(1<<(irq_nr-32), IC1_CFG1CLR);
 347                                 au_writel(1<<(irq_nr-32), IC1_CFG2CLR);
 348                                 return;
 349                 }
 350                 if (int_req) /* assign to interrupt request 1 */
 351                         au_writel(1<<(irq_nr-32), IC1_ASSIGNCLR);
 352                 else         /* assign to interrupt request 0 */
 353                         au_writel(1<<(irq_nr-32), IC1_ASSIGNSET);
 354                 au_writel(1<<(irq_nr-32), IC1_SRCSET);
 355                 au_writel(1<<(irq_nr-32), IC1_MASKCLR);
 356                 au_writel(1<<(irq_nr-32), IC1_WAKECLR);
 357         }
 358         else {
 359                 switch (type) {
 360                         case INTC_INT_RISE_EDGE: /* 0:0:1 */
 361                                 au_writel(1<<irq_nr, IC0_CFG2CLR);
 362                                 au_writel(1<<irq_nr, IC0_CFG1CLR);
 363                                 au_writel(1<<irq_nr, IC0_CFG0SET);
 364                                 set_irq_chip(irq_nr, &rise_edge_irq_type);
 365                                 break;
 366                         case INTC_INT_FALL_EDGE: /* 0:1:0 */
 367                                 au_writel(1<<irq_nr, IC0_CFG2CLR);
 368                                 au_writel(1<<irq_nr, IC0_CFG1SET);
 369                                 au_writel(1<<irq_nr, IC0_CFG0CLR);
 370                                 set_irq_chip(irq_nr, &fall_edge_irq_type);
 371                                 break;
 372                         case INTC_INT_RISE_AND_FALL_EDGE: /* 0:1:1 */
 373                                 au_writel(1<<irq_nr, IC0_CFG2CLR);
 374                                 au_writel(1<<irq_nr, IC0_CFG1SET);
 375                                 au_writel(1<<irq_nr, IC0_CFG0SET);
 376                                 set_irq_chip(irq_nr, &either_edge_irq_type);
 377                                 break;
 378                         case INTC_INT_HIGH_LEVEL: /* 1:0:1 */
 379                                 au_writel(1<<irq_nr, IC0_CFG2SET);
 380                                 au_writel(1<<irq_nr, IC0_CFG1CLR);
 381                                 au_writel(1<<irq_nr, IC0_CFG0SET);
 382                                 set_irq_chip(irq_nr, &level_irq_type);
 383                                 break;
 384                         case INTC_INT_LOW_LEVEL: /* 1:1:0 */
 385                                 au_writel(1<<irq_nr, IC0_CFG2SET);
 386                                 au_writel(1<<irq_nr, IC0_CFG1SET);
 387                                 au_writel(1<<irq_nr, IC0_CFG0CLR);
 388                                 set_irq_chip(irq_nr, &level_irq_type);
 389                                 break;
 390                         case INTC_INT_DISABLED: /* 0:0:0 */
 391                                 au_writel(1<<irq_nr, IC0_CFG0CLR);
 392                                 au_writel(1<<irq_nr, IC0_CFG1CLR);
 393                                 au_writel(1<<irq_nr, IC0_CFG2CLR);
 394                                 break;
 395                         default: /* disable the interrupt */
 396                                 printk("unexpected int type %d (irq %d)\n", type, irq_nr);
 397                                 au_writel(1<<irq_nr, IC0_CFG0CLR);
 398                                 au_writel(1<<irq_nr, IC0_CFG1CLR);
 399                                 au_writel(1<<irq_nr, IC0_CFG2CLR);
 400                                 return;
 401                 }
 402                 if (int_req) /* assign to interrupt request 1 */
 403                         au_writel(1<<irq_nr, IC0_ASSIGNCLR);
 404                 else         /* assign to interrupt request 0 */
 405                         au_writel(1<<irq_nr, IC0_ASSIGNSET);
 406                 au_writel(1<<irq_nr, IC0_SRCSET);
 407                 au_writel(1<<irq_nr, IC0_MASKCLR);
 408                 au_writel(1<<irq_nr, IC0_WAKECLR);
 409         }
 410         au_sync();
 411 }
 412
 413
 414 void __init arch_init_irq(void)
 415 {
 416         int i;
 417         unsigned long cp0_status;
 418         au1xxx_irq_map_t *imp;
 419         extern au1xxx_irq_map_t au1xxx_irq_map[];
 420         extern au1xxx_irq_map_t au1xxx_ic0_map[];
 421         extern int au1xxx_nr_irqs;
 422         extern int au1xxx_ic0_nr_irqs;
 423
 424         cp0_status = read_c0_status();
 425
 426         /* Initialize interrupt controllers to a safe state.
 427         */
 428         au_writel(0xffffffff, IC0_CFG0CLR);
 429         au_writel(0xffffffff, IC0_CFG1CLR);
 430         au_writel(0xffffffff, IC0_CFG2CLR);
 431         au_writel(0xffffffff, IC0_MASKCLR);
 432         au_writel(0xffffffff, IC0_ASSIGNSET);
 433         au_writel(0xffffffff, IC0_WAKECLR);
 434         au_writel(0xffffffff, IC0_SRCSET);
 435         au_writel(0xffffffff, IC0_FALLINGCLR);
 436         au_writel(0xffffffff, IC0_RISINGCLR);
 437         au_writel(0x00000000, IC0_TESTBIT);
 438
 439         au_writel(0xffffffff, IC1_CFG0CLR);
 440         au_writel(0xffffffff, IC1_CFG1CLR);
 441         au_writel(0xffffffff, IC1_CFG2CLR);
 442         au_writel(0xffffffff, IC1_MASKCLR);
 443         au_writel(0xffffffff, IC1_ASSIGNSET);
 444         au_writel(0xffffffff, IC1_WAKECLR);
 445         au_writel(0xffffffff, IC1_SRCSET);
 446         au_writel(0xffffffff, IC1_FALLINGCLR);
 447         au_writel(0xffffffff, IC1_RISINGCLR);
 448         au_writel(0x00000000, IC1_TESTBIT);
 449
 450         /* Initialize IC0, which is fixed per processor.
 451         */
 452         imp = au1xxx_ic0_map;
 453         for (i=0; i<au1xxx_ic0_nr_irqs; i++) {
 454                 setup_local_irq(imp->im_irq, imp->im_type, imp->im_request);
 455                 imp++;
 456         }
 457
 458         /* Now set up the irq mapping for the board.
 459         */
 460         imp = au1xxx_irq_map;
 461         for (i=0; i<au1xxx_nr_irqs; i++) {
 462                 setup_local_irq(imp->im_irq, imp->im_type, imp->im_request);
 463                 imp++;
 464         }
 465
 466         set_c0_status(ALLINTS);
 467
 468         /* Board specific IRQ initialization.
 469         */
 470         if (board_init_irq)
 471                 (*board_init_irq)();
 472 }
 473
 474
 475 /*
 476  * Interrupts are nested. Even if an interrupt handler is registered
 477  * as "fast", we might get another interrupt before we return from
 478  * intcX_reqX_irqdispatch().
 479  */
 480
 481 static void intc0_req0_irqdispatch(void)
 482 {
 483         int irq = 0;
 484         static unsigned long intc0_req0 = 0;
 485
 486         intc0_req0 |= au_readl(IC0_REQ0INT);
 487
 488         if (!intc0_req0)
 489                 return;
 490 #ifdef AU1000_USB_DEV_REQ_INT
 491         /*
 492          * Because of the tight timing of SETUP token to reply
 493          * transactions, the USB devices-side packet complete
 494          * interrupt needs the highest priority.
 495          */
 496         if ((intc0_req0 & (1<<AU1000_USB_DEV_REQ_INT))) {
 497                 intc0_req0 &= ~(1<<AU1000_USB_DEV_REQ_INT);
 498                 do_IRQ(AU1000_USB_DEV_REQ_INT);
 499                 return;
 500         }
 501 #endif
 502         irq = au_ffs(intc0_req0) - 1;
 503         intc0_req0 &= ~(1<<irq);
 504         do_IRQ(irq);
 505 }
 506
 507
 508 static void intc0_req1_irqdispatch(void)
 509 {
 510         int irq = 0;
 511         static unsigned long intc0_req1 = 0;
 512
 513         intc0_req1 |= au_readl(IC0_REQ1INT);
 514
 515         if (!intc0_req1)
 516                 return;
 517
 518         irq = au_ffs(intc0_req1) - 1;
 519         intc0_req1 &= ~(1<<irq);
 520         do_IRQ(irq);
 521 }
 522
 523
 524 /*
 525  * Interrupt Controller 1:
 526  * interrupts 32 - 63
 527  */
 528 static void intc1_req0_irqdispatch(void)
 529 {
 530         int irq = 0;
 531         static unsigned long intc1_req0 = 0;
 532
 533         intc1_req0 |= au_readl(IC1_REQ0INT);
 534
 535         if (!intc1_req0)
 536                 return;
 537
 538         irq = au_ffs(intc1_req0) - 1;
 539         intc1_req0 &= ~(1<<irq);
 540         irq += 32;
 541         do_IRQ(irq);
 542 }
 543
 544
 545 static void intc1_req1_irqdispatch(void)
 546 {
 547         int irq = 0;
 548         static unsigned long intc1_req1 = 0;
 549
 550         intc1_req1 |= au_readl(IC1_REQ1INT);
 551
 552         if (!intc1_req1)
 553                 return;
 554
 555         irq = au_ffs(intc1_req1) - 1;
 556         intc1_req1 &= ~(1<<irq);
 557         irq += 32;
 558         do_IRQ(irq);
 559 }
 560
 561 #ifdef CONFIG_PM
 562
 563 /* Save/restore the interrupt controller state.
 564  * Called from the save/restore core registers as part of the
 565  * au_sleep function in power.c.....maybe I should just pm_register()
 566  * them instead?
 567  */
 568 static unsigned int     sleep_intctl_config0[2];
 569 static unsigned int     sleep_intctl_config1[2];
 570 static unsigned int     sleep_intctl_config2[2];
 571 static unsigned int     sleep_intctl_src[2];
 572 static unsigned int     sleep_intctl_assign[2];
 573 static unsigned int     sleep_intctl_wake[2];
 574 static unsigned int     sleep_intctl_mask[2];
 575
 576 void
 577 save_au1xxx_intctl(void)
 578 {
 579         sleep_intctl_config0[0] = au_readl(IC0_CFG0RD);
 580         sleep_intctl_config1[0] = au_readl(IC0_CFG1RD);
 581         sleep_intctl_config2[0] = au_readl(IC0_CFG2RD);
 582         sleep_intctl_src[0] = au_readl(IC0_SRCRD);
 583         sleep_intctl_assign[0] = au_readl(IC0_ASSIGNRD);
 584         sleep_intctl_wake[0] = au_readl(IC0_WAKERD);
 585         sleep_intctl_mask[0] = au_readl(IC0_MASKRD);
 586
 587         sleep_intctl_config0[1] = au_readl(IC1_CFG0RD);
 588         sleep_intctl_config1[1] = au_readl(IC1_CFG1RD);
 589         sleep_intctl_config2[1] = au_readl(IC1_CFG2RD);
 590         sleep_intctl_src[1] = au_readl(IC1_SRCRD);
 591         sleep_intctl_assign[1] = au_readl(IC1_ASSIGNRD);
 592         sleep_intctl_wake[1] = au_readl(IC1_WAKERD);
 593         sleep_intctl_mask[1] = au_readl(IC1_MASKRD);
 594 }
 595
 596 /* For most restore operations, we clear the entire register and
 597  * then set the bits we found during the save.
 598  */
 599 void
 600 restore_au1xxx_intctl(void)
 601 {
 602         au_writel(0xffffffff, IC0_MASKCLR); au_sync();
 603
 604         au_writel(0xffffffff, IC0_CFG0CLR); au_sync();
 605         au_writel(sleep_intctl_config0[0], IC0_CFG0SET); au_sync();
 606         au_writel(0xffffffff, IC0_CFG1CLR); au_sync();
 607         au_writel(sleep_intctl_config1[0], IC0_CFG1SET); au_sync();
 608         au_writel(0xffffffff, IC0_CFG2CLR); au_sync();
 609         au_writel(sleep_intctl_config2[0], IC0_CFG2SET); au_sync();
 610         au_writel(0xffffffff, IC0_SRCCLR); au_sync();
 611         au_writel(sleep_intctl_src[0], IC0_SRCSET); au_sync();
 612         au_writel(0xffffffff, IC0_ASSIGNCLR); au_sync();
 613         au_writel(sleep_intctl_assign[0], IC0_ASSIGNSET); au_sync();
 614         au_writel(0xffffffff, IC0_WAKECLR); au_sync();
 615         au_writel(sleep_intctl_wake[0], IC0_WAKESET); au_sync();
 616         au_writel(0xffffffff, IC0_RISINGCLR); au_sync();
 617         au_writel(0xffffffff, IC0_FALLINGCLR); au_sync();
 618         au_writel(0x00000000, IC0_TESTBIT); au_sync();
 619
 620         au_writel(0xffffffff, IC1_MASKCLR); au_sync();
 621
 622         au_writel(0xffffffff, IC1_CFG0CLR); au_sync();
 623         au_writel(sleep_intctl_config0[1], IC1_CFG0SET); au_sync();
 624         au_writel(0xffffffff, IC1_CFG1CLR); au_sync();
 625         au_writel(sleep_intctl_config1[1], IC1_CFG1SET); au_sync();
 626         au_writel(0xffffffff, IC1_CFG2CLR); au_sync();
 627         au_writel(sleep_intctl_config2[1], IC1_CFG2SET); au_sync();
 628         au_writel(0xffffffff, IC1_SRCCLR); au_sync();
 629         au_writel(sleep_intctl_src[1], IC1_SRCSET); au_sync();
 630         au_writel(0xffffffff, IC1_ASSIGNCLR); au_sync();
 631         au_writel(sleep_intctl_assign[1], IC1_ASSIGNSET); au_sync();
 632         au_writel(0xffffffff, IC1_WAKECLR); au_sync();
 633         au_writel(sleep_intctl_wake[1], IC1_WAKESET); au_sync();
 634         au_writel(0xffffffff, IC1_RISINGCLR); au_sync();
 635         au_writel(0xffffffff, IC1_FALLINGCLR); au_sync();
 636         au_writel(0x00000000, IC1_TESTBIT); au_sync();
 637
 638         au_writel(sleep_intctl_mask[1], IC1_MASKSET); au_sync();
 639
 640         au_writel(sleep_intctl_mask[0], IC0_MASKSET); au_sync();
 641 }
 642 #endif /* CONFIG_PM */
 643
 644 asmlinkage void plat_irq_dispatch(void)
 645 {
 646         unsigned int pending = read_c0_status() & read_c0_cause() & ST0_IM;
 647
 648         if (pending & CAUSEF_IP7)
 649                 mips_timer_interrupt();
 650         else if (pending & CAUSEF_IP2)
 651                 intc0_req0_irqdispatch();
 652         else if (pending & CAUSEF_IP3)
 653                 intc0_req1_irqdispatch();
 654         else if (pending & CAUSEF_IP4)
 655                 intc1_req0_irqdispatch();
 656         else if (pending  & CAUSEF_IP5)
 657                 intc1_req1_irqdispatch();
 658         else
 659                 spurious_interrupt();
 660 }