arch/blackfin/mach-common/ints-priority.c

   1 /*
   2  * Set up the interrupt priorities
   3  *
   4  * Copyright  2004-2009 Analog Devices Inc.
   5  *                 2003 Bas Vermeulen <bas@buyways.nl>
   6  *                 2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca>
   7  *            2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca>
   8  *                 1999 D. Jeff Dionne <jeff@uclinux.org>
   9  *                 1996 Roman Zippel
  10  *
  11  * Licensed under the GPL-2
  12  */
  13
  14 #include <linux/module.h>
  15 #include <linux/kernel_stat.h>
  16 #include <linux/seq_file.h>
  17 #include <linux/irq.h>
  18 #include <linux/sched.h>
  19 #ifdef CONFIG_IPIPE
  20 #include <linux/ipipe.h>
  21 #endif
  22 #include <asm/traps.h>
  23 #include <asm/blackfin.h>
  24 #include <asm/gpio.h>
  25 #include <asm/irq_handler.h>
  26 #include <asm/dpmc.h>
  27
  28 #define SIC_SYSIRQ(irq) (irq - (IRQ_CORETMR + 1))
  29
  30 /*
  31  * NOTES:
  32  * - we have separated the physical Hardware interrupt from the
  33  * levels that the LINUX kernel sees (see the description in irq.h)
  34  * -
  35  */
  36
  37 #ifndef CONFIG_SMP
  38 /* Initialize this to an actual value to force it into the .data
  39  * section so that we know it is properly initialized at entry into
  40  * the kernel but before bss is initialized to zero (which is where
  41  * it would live otherwise).  The 0x1f magic represents the IRQs we
  42  * cannot actually mask out in hardware.
  43  */
  44 unsigned long bfin_irq_flags = 0x1f;
  45 EXPORT_SYMBOL(bfin_irq_flags);
  46 #endif
  47
  48 #ifdef CONFIG_PM
  49 unsigned long bfin_sic_iwr[3];  /* Up to 3 SIC_IWRx registers */
  50 unsigned vr_wakeup;
  51 #endif
  52
  53 static struct ivgx {
  54         /* irq number for request_irq, available in mach-bf5xx/irq.h */
  55         unsigned int irqno;
  56         /* corresponding bit in the SIC_ISR register */
  57         unsigned int isrflag;
  58 } ivg_table[NR_PERI_INTS];
  59
  60 static struct ivg_slice {
  61         /* position of first irq in ivg_table for given ivg */
  62         struct ivgx *ifirst;
  63         struct ivgx *istop;
  64 } ivg7_13[IVG13 - IVG7 + 1];
  65
  66
  67 /*
  68  * Search SIC_IAR and fill tables with the irqvalues
  69  * and their positions in the SIC_ISR register.
  70  */
  71 static void __init search_IAR(void)
  72 {
  73         unsigned ivg, irq_pos = 0;
  74         for (ivg = 0; ivg <= IVG13 - IVG7; ivg++) {
  75                 int irqN;
  76
  77                 ivg7_13[ivg].istop = ivg7_13[ivg].ifirst = &ivg_table[irq_pos];
  78
  79                 for (irqN = 0; irqN < NR_PERI_INTS; irqN += 4) {
  80                         int irqn;
  81                         u32 iar = bfin_read32((unsigned long *)SIC_IAR0 +
  82 #if defined(CONFIG_BF51x) || defined(CONFIG_BF52x) || \
  83         defined(CONFIG_BF538) || defined(CONFIG_BF539)
  84                                 ((irqN % 32) >> 3) + ((irqN / 32) * ((SIC_IAR4 - SIC_IAR0) / 4))
  85 #else
  86                                 (irqN >> 3)
  87 #endif
  88                                 );
  89
  90                         for (irqn = irqN; irqn < irqN + 4; ++irqn) {
  91                                 int iar_shift = (irqn & 7) * 4;
  92                                 if (ivg == (0xf & (iar >> iar_shift))) {
  93                                         ivg_table[irq_pos].irqno = IVG7 + irqn;
  94                                         ivg_table[irq_pos].isrflag = 1 << (irqn % 32);
  95                                         ivg7_13[ivg].istop++;
  96                                         irq_pos++;
  97                                 }
  98                         }
  99                 }
 100         }
 101 }
 102
 103 /*
 104  * This is for core internal IRQs
 105  */
 106
 107 void bfin_ack_noop(struct irq_data *d)
 108 {
 109         /* Dummy function.  */
 110 }
 111
 112 static void bfin_core_mask_irq(struct irq_data *d)
 113 {
 114         bfin_irq_flags &= ~(1 << d->irq);
 115         if (!hard_irqs_disabled())
 116                 hard_local_irq_enable();
 117 }
 118
 119 static void bfin_core_unmask_irq(struct irq_data *d)
 120 {
 121         bfin_irq_flags |= 1 << d->irq;
 122         /*
 123          * If interrupts are enabled, IMASK must contain the same value
 124          * as bfin_irq_flags.  Make sure that invariant holds.  If interrupts
 125          * are currently disabled we need not do anything; one of the
 126          * callers will take care of setting IMASK to the proper value
 127          * when reenabling interrupts.
 128          * local_irq_enable just does "STI bfin_irq_flags", so it's exactly
 129          * what we need.
 130          */
 131         if (!hard_irqs_disabled())
 132                 hard_local_irq_enable();
 133         return;
 134 }
 135
 136 void bfin_internal_mask_irq(unsigned int irq)
 137 {
 138         unsigned long flags = hard_local_irq_save();
 139
 140 #ifdef SIC_IMASK0
 141         unsigned mask_bank = SIC_SYSIRQ(irq) / 32;
 142         unsigned mask_bit = SIC_SYSIRQ(irq) % 32;
 143         bfin_write_SIC_IMASK(mask_bank, bfin_read_SIC_IMASK(mask_bank) &
 144                              ~(1 << mask_bit));
 145 # ifdef CONFIG_SMP
 146         bfin_write_SICB_IMASK(mask_bank, bfin_read_SICB_IMASK(mask_bank) &
 147                              ~(1 << mask_bit));
 148 # endif
 149 #else
 150         bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() &
 151                              ~(1 << SIC_SYSIRQ(irq)));
 152 #endif
 153
 154         hard_local_irq_restore(flags);
 155 }
 156
 157 static void bfin_internal_mask_irq_chip(struct irq_data *d)
 158 {
 159         bfin_internal_mask_irq(d->irq);
 160 }
 161
 162 #ifdef CONFIG_SMP
 163 static void bfin_internal_unmask_irq_affinity(unsigned int irq,
 164                 const struct cpumask *affinity)
 165 #else
 166 void bfin_internal_unmask_irq(unsigned int irq)
 167 #endif
 168 {
 169         unsigned long flags = hard_local_irq_save();
 170
 171 #ifdef SIC_IMASK0
 172         unsigned mask_bank = SIC_SYSIRQ(irq) / 32;
 173         unsigned mask_bit = SIC_SYSIRQ(irq) % 32;
 174 # ifdef CONFIG_SMP
 175         if (cpumask_test_cpu(0, affinity))
 176 # endif
 177                 bfin_write_SIC_IMASK(mask_bank,
 178                         bfin_read_SIC_IMASK(mask_bank) |
 179                         (1 << mask_bit));
 180 # ifdef CONFIG_SMP
 181         if (cpumask_test_cpu(1, affinity))
 182                 bfin_write_SICB_IMASK(mask_bank,
 183                         bfin_read_SICB_IMASK(mask_bank) |
 184                         (1 << mask_bit));
 185 # endif
 186 #else
 187         bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() |
 188                              (1 << SIC_SYSIRQ(irq)));
 189 #endif
 190
 191         hard_local_irq_restore(flags);
 192 }
 193
 194 #ifdef CONFIG_SMP
 195 static void bfin_internal_unmask_irq_chip(struct irq_data *d)
 196 {
 197         bfin_internal_unmask_irq_affinity(d->irq, d->affinity);
 198 }
 199
 200 static int bfin_internal_set_affinity(struct irq_data *d,
 201                                       const struct cpumask *mask, bool force)
 202 {
 203         bfin_internal_mask_irq(d->irq);
 204         bfin_internal_unmask_irq_affinity(d->irq, mask);
 205
 206         return 0;
 207 }
 208 #else
 209 static void bfin_internal_unmask_irq_chip(struct irq_data *d)
 210 {
 211         bfin_internal_unmask_irq(d->irq);
 212 }
 213 #endif
 214
 215 #ifdef CONFIG_PM
 216 int bfin_internal_set_wake(unsigned int irq, unsigned int state)
 217 {
 218         u32 bank, bit, wakeup = 0;
 219         unsigned long flags;
 220         bank = SIC_SYSIRQ(irq) / 32;
 221         bit = SIC_SYSIRQ(irq) % 32;
 222
 223         switch (irq) {
 224 #ifdef IRQ_RTC
 225         case IRQ_RTC:
 226         wakeup |= WAKE;
 227         break;
 228 #endif
 229 #ifdef IRQ_CAN0_RX
 230         case IRQ_CAN0_RX:
 231         wakeup |= CANWE;
 232         break;
 233 #endif
 234 #ifdef IRQ_CAN1_RX
 235         case IRQ_CAN1_RX:
 236         wakeup |= CANWE;
 237         break;
 238 #endif
 239 #ifdef IRQ_USB_INT0
 240         case IRQ_USB_INT0:
 241         wakeup |= USBWE;
 242         break;
 243 #endif
 244 #ifdef CONFIG_BF54x
 245         case IRQ_CNT:
 246         wakeup |= ROTWE;
 247         break;
 248 #endif
 249         default:
 250         break;
 251         }
 252
 253         flags = hard_local_irq_save();
 254
 255         if (state) {
 256                 bfin_sic_iwr[bank] |= (1 << bit);
 257                 vr_wakeup  |= wakeup;
 258
 259         } else {
 260                 bfin_sic_iwr[bank] &= ~(1 << bit);
 261                 vr_wakeup  &= ~wakeup;
 262         }
 263
 264         hard_local_irq_restore(flags);
 265
 266         return 0;
 267 }
 268
 269 static int bfin_internal_set_wake_chip(struct irq_data *d, unsigned int state)
 270 {
 271         return bfin_internal_set_wake(d->irq, state);
 272 }
 273 #else
 274 # define bfin_internal_set_wake_chip NULL
 275 #endif
 276
 277 static struct irq_chip bfin_core_irqchip = {
 278         .name = "CORE",
 279         .irq_ack = bfin_ack_noop,
 280         .irq_mask = bfin_core_mask_irq,
 281         .irq_unmask = bfin_core_unmask_irq,
 282 };
 283
 284 static struct irq_chip bfin_internal_irqchip = {
 285         .name = "INTN",
 286         .irq_ack = bfin_ack_noop,
 287         .irq_mask = bfin_internal_mask_irq_chip,
 288         .irq_unmask = bfin_internal_unmask_irq_chip,
 289         .irq_mask_ack = bfin_internal_mask_irq_chip,
 290         .irq_disable = bfin_internal_mask_irq_chip,
 291         .irq_enable = bfin_internal_unmask_irq_chip,
 292 #ifdef CONFIG_SMP
 293         .irq_set_affinity = bfin_internal_set_affinity,
 294 #endif
 295         .irq_set_wake = bfin_internal_set_wake_chip,
 296 };
 297
 298 void bfin_handle_irq(unsigned irq)
 299 {
 300 #ifdef CONFIG_IPIPE
 301         struct pt_regs regs;    /* Contents not used. */
 302         ipipe_trace_irq_entry(irq);
 303         __ipipe_handle_irq(irq, &regs);
 304         ipipe_trace_irq_exit(irq);
 305 #else /* !CONFIG_IPIPE */
 306         generic_handle_irq(irq);
 307 #endif  /* !CONFIG_IPIPE */
 308 }
 309
 310 #if defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)
 311 static int mac_stat_int_mask;
 312
 313 static void bfin_mac_status_ack_irq(unsigned int irq)
 314 {
 315         switch (irq) {
 316         case IRQ_MAC_MMCINT:
 317                 bfin_write_EMAC_MMC_TIRQS(
 318                         bfin_read_EMAC_MMC_TIRQE() &
 319                         bfin_read_EMAC_MMC_TIRQS());
 320                 bfin_write_EMAC_MMC_RIRQS(
 321                         bfin_read_EMAC_MMC_RIRQE() &
 322                         bfin_read_EMAC_MMC_RIRQS());
 323                 break;
 324         case IRQ_MAC_RXFSINT:
 325                 bfin_write_EMAC_RX_STKY(
 326                         bfin_read_EMAC_RX_IRQE() &
 327                         bfin_read_EMAC_RX_STKY());
 328                 break;
 329         case IRQ_MAC_TXFSINT:
 330                 bfin_write_EMAC_TX_STKY(
 331                         bfin_read_EMAC_TX_IRQE() &
 332                         bfin_read_EMAC_TX_STKY());
 333                 break;
 334         case IRQ_MAC_WAKEDET:
 335                  bfin_write_EMAC_WKUP_CTL(
 336                         bfin_read_EMAC_WKUP_CTL() | MPKS | RWKS);
 337                 break;
 338         default:
 339                 /* These bits are W1C */
 340                 bfin_write_EMAC_SYSTAT(1L << (irq - IRQ_MAC_PHYINT));
 341                 break;
 342         }
 343 }
 344
 345 static void bfin_mac_status_mask_irq(struct irq_data *d)
 346 {
 347         unsigned int irq = d->irq;
 348
 349         mac_stat_int_mask &= ~(1L << (irq - IRQ_MAC_PHYINT));
 350 #ifdef BF537_FAMILY
 351         switch (irq) {
 352         case IRQ_MAC_PHYINT:
 353                 bfin_write_EMAC_SYSCTL(bfin_read_EMAC_SYSCTL() & ~PHYIE);
 354                 break;
 355         default:
 356                 break;
 357         }
 358 #else
 359         if (!mac_stat_int_mask)
 360                 bfin_internal_mask_irq(IRQ_MAC_ERROR);
 361 #endif
 362         bfin_mac_status_ack_irq(irq);
 363 }
 364
 365 static void bfin_mac_status_unmask_irq(struct irq_data *d)
 366 {
 367         unsigned int irq = d->irq;
 368
 369 #ifdef BF537_FAMILY
 370         switch (irq) {
 371         case IRQ_MAC_PHYINT:
 372                 bfin_write_EMAC_SYSCTL(bfin_read_EMAC_SYSCTL() | PHYIE);
 373                 break;
 374         default:
 375                 break;
 376         }
 377 #else
 378         if (!mac_stat_int_mask)
 379                 bfin_internal_unmask_irq(IRQ_MAC_ERROR);
 380 #endif
 381         mac_stat_int_mask |= 1L << (irq - IRQ_MAC_PHYINT);
 382 }
 383
 384 #ifdef CONFIG_PM
 385 int bfin_mac_status_set_wake(struct irq_data *d, unsigned int state)
 386 {
 387 #ifdef BF537_FAMILY
 388         return bfin_internal_set_wake(IRQ_GENERIC_ERROR, state);
 389 #else
 390         return bfin_internal_set_wake(IRQ_MAC_ERROR, state);
 391 #endif
 392 }
 393 #else
 394 # define bfin_mac_status_set_wake NULL
 395 #endif
 396
 397 static struct irq_chip bfin_mac_status_irqchip = {
 398         .name = "MACST",
 399         .irq_ack = bfin_ack_noop,
 400         .irq_mask_ack = bfin_mac_status_mask_irq,
 401         .irq_mask = bfin_mac_status_mask_irq,
 402         .irq_unmask = bfin_mac_status_unmask_irq,
 403         .irq_set_wake = bfin_mac_status_set_wake,
 404 };
 405
 406 void bfin_demux_mac_status_irq(unsigned int int_err_irq,
 407                                struct irq_desc *inta_desc)
 408 {
 409         int i, irq = 0;
 410         u32 status = bfin_read_EMAC_SYSTAT();
 411
 412         for (i = 0; i <= (IRQ_MAC_STMDONE - IRQ_MAC_PHYINT); i++)
 413                 if (status & (1L << i)) {
 414                         irq = IRQ_MAC_PHYINT + i;
 415                         break;
 416                 }
 417
 418         if (irq) {
 419                 if (mac_stat_int_mask & (1L << (irq - IRQ_MAC_PHYINT))) {
 420                         bfin_handle_irq(irq);
 421                 } else {
 422                         bfin_mac_status_ack_irq(irq);
 423                         pr_debug("IRQ %d:"
 424                                  " MASKED MAC ERROR INTERRUPT ASSERTED\n",
 425                                  irq);
 426                 }
 427         } else
 428                 printk(KERN_ERR
 429                        "%s : %s : LINE %d :\nIRQ ?: MAC ERROR"
 430                        " INTERRUPT ASSERTED BUT NO SOURCE FOUND"
 431                        "(EMAC_SYSTAT=0x%X)\n",
 432                        __func__, __FILE__, __LINE__, status);
 433 }
 434 #endif
 435
 436 static inline void bfin_set_irq_handler(unsigned irq, irq_flow_handler_t handle)
 437 {
 438 #ifdef CONFIG_IPIPE
 439         handle = handle_level_irq;
 440 #endif
 441         __irq_set_handler_locked(irq, handle);
 442 }
 443
 444 static DECLARE_BITMAP(gpio_enabled, MAX_BLACKFIN_GPIOS);
 445 extern void bfin_gpio_irq_prepare(unsigned gpio);
 446
 447 #if !BFIN_GPIO_PINT
 448
 449 static void bfin_gpio_ack_irq(struct irq_data *d)
 450 {
 451         /* AFAIK ack_irq in case mask_ack is provided
 452          * get's only called for edge sense irqs
 453          */
 454         set_gpio_data(irq_to_gpio(d->irq), 0);
 455 }
 456
 457 static void bfin_gpio_mask_ack_irq(struct irq_data *d)
 458 {
 459         unsigned int irq = d->irq;
 460         u32 gpionr = irq_to_gpio(irq);
 461
 462         if (!irqd_is_level_type(d))
 463                 set_gpio_data(gpionr, 0);
 464
 465         set_gpio_maska(gpionr, 0);
 466 }
 467
 468 static void bfin_gpio_mask_irq(struct irq_data *d)
 469 {
 470         set_gpio_maska(irq_to_gpio(d->irq), 0);
 471 }
 472
 473 static void bfin_gpio_unmask_irq(struct irq_data *d)
 474 {
 475         set_gpio_maska(irq_to_gpio(d->irq), 1);
 476 }
 477
 478 static unsigned int bfin_gpio_irq_startup(struct irq_data *d)
 479 {
 480         u32 gpionr = irq_to_gpio(d->irq);
 481
 482         if (__test_and_set_bit(gpionr, gpio_enabled))
 483                 bfin_gpio_irq_prepare(gpionr);
 484
 485         bfin_gpio_unmask_irq(d);
 486
 487         return 0;
 488 }
 489
 490 static void bfin_gpio_irq_shutdown(struct irq_data *d)
 491 {
 492         u32 gpionr = irq_to_gpio(d->irq);
 493
 494         bfin_gpio_mask_irq(d);
 495         __clear_bit(gpionr, gpio_enabled);
 496         bfin_gpio_irq_free(gpionr);
 497 }
 498
 499 static int bfin_gpio_irq_type(struct irq_data *d, unsigned int type)
 500 {
 501         unsigned int irq = d->irq;
 502         int ret;
 503         char buf[16];
 504         u32 gpionr = irq_to_gpio(irq);
 505
 506         if (type == IRQ_TYPE_PROBE) {
 507                 /* only probe unenabled GPIO interrupt lines */
 508                 if (test_bit(gpionr, gpio_enabled))
 509                         return 0;
 510                 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 511         }
 512
 513         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
 514                     IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
 515
 516                 snprintf(buf, 16, "gpio-irq%d", irq);
 517                 ret = bfin_gpio_irq_request(gpionr, buf);
 518                 if (ret)
 519                         return ret;
 520
 521                 if (__test_and_set_bit(gpionr, gpio_enabled))
 522                         bfin_gpio_irq_prepare(gpionr);
 523
 524         } else {
 525                 __clear_bit(gpionr, gpio_enabled);
 526                 return 0;
 527         }
 528
 529         set_gpio_inen(gpionr, 0);
 530         set_gpio_dir(gpionr, 0);
 531
 532         if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 533             == (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 534                 set_gpio_both(gpionr, 1);
 535         else
 536                 set_gpio_both(gpionr, 0);
 537
 538         if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
 539                 set_gpio_polar(gpionr, 1);      /* low or falling edge denoted by one */
 540         else
 541                 set_gpio_polar(gpionr, 0);      /* high or rising edge denoted by zero */
 542
 543         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
 544                 set_gpio_edge(gpionr, 1);
 545                 set_gpio_inen(gpionr, 1);
 546                 set_gpio_data(gpionr, 0);
 547
 548         } else {
 549                 set_gpio_edge(gpionr, 0);
 550                 set_gpio_inen(gpionr, 1);
 551         }
 552
 553         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 554                 bfin_set_irq_handler(irq, handle_edge_irq);
 555         else
 556                 bfin_set_irq_handler(irq, handle_level_irq);
 557
 558         return 0;
 559 }
 560
 561 #ifdef CONFIG_PM
 562 static int bfin_gpio_set_wake(struct irq_data *d, unsigned int state)
 563 {
 564         return gpio_pm_wakeup_ctrl(irq_to_gpio(d->irq), state);
 565 }
 566 #else
 567 # define bfin_gpio_set_wake NULL
 568 #endif
 569
 570 static void bfin_demux_gpio_block(unsigned int irq)
 571 {
 572         unsigned int gpio, mask;
 573
 574         gpio = irq_to_gpio(irq);
 575         mask = get_gpiop_data(gpio) & get_gpiop_maska(gpio);
 576
 577         while (mask) {
 578                 if (mask & 1)
 579                         bfin_handle_irq(irq);
 580                 irq++;
 581                 mask >>= 1;
 582         }
 583 }
 584
 585 void bfin_demux_gpio_irq(unsigned int inta_irq,
 586                          struct irq_desc *desc)
 587 {
 588         unsigned int irq;
 589
 590         switch (inta_irq) {
 591 #if defined(BF537_FAMILY)
 592         case IRQ_PF_INTA_PG_INTA:
 593                 bfin_demux_gpio_block(IRQ_PF0);
 594                 irq = IRQ_PG0;
 595                 break;
 596         case IRQ_PH_INTA_MAC_RX:
 597                 irq = IRQ_PH0;
 598                 break;
 599 #elif defined(BF533_FAMILY)
 600         case IRQ_PROG_INTA:
 601                 irq = IRQ_PF0;
 602                 break;
 603 #elif defined(BF538_FAMILY)
 604         case IRQ_PORTF_INTA:
 605                 irq = IRQ_PF0;
 606                 break;
 607 #elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
 608         case IRQ_PORTF_INTA:
 609                 irq = IRQ_PF0;
 610                 break;
 611         case IRQ_PORTG_INTA:
 612                 irq = IRQ_PG0;
 613                 break;
 614         case IRQ_PORTH_INTA:
 615                 irq = IRQ_PH0;
 616                 break;
 617 #elif defined(CONFIG_BF561)
 618         case IRQ_PROG0_INTA:
 619                 irq = IRQ_PF0;
 620                 break;
 621         case IRQ_PROG1_INTA:
 622                 irq = IRQ_PF16;
 623                 break;
 624         case IRQ_PROG2_INTA:
 625                 irq = IRQ_PF32;
 626                 break;
 627 #endif
 628         default:
 629                 BUG();
 630                 return;
 631         }
 632
 633         bfin_demux_gpio_block(irq);
 634 }
 635
 636 #else
 637
 638 #define NR_PINT_SYS_IRQS        4
 639 #define NR_PINT_BITS            32
 640 #define NR_PINTS                160
 641 #define IRQ_NOT_AVAIL           0xFF
 642
 643 #define PINT_2_BANK(x)          ((x) >> 5)
 644 #define PINT_2_BIT(x)           ((x) & 0x1F)
 645 #define PINT_BIT(x)             (1 << (PINT_2_BIT(x)))
 646
 647 static unsigned char irq2pint_lut[NR_PINTS];
 648 static unsigned char pint2irq_lut[NR_PINT_SYS_IRQS * NR_PINT_BITS];
 649
 650 static struct bfin_pint_regs * const pint[NR_PINT_SYS_IRQS] = {
 651         (struct bfin_pint_regs *)PINT0_MASK_SET,
 652         (struct bfin_pint_regs *)PINT1_MASK_SET,
 653         (struct bfin_pint_regs *)PINT2_MASK_SET,
 654         (struct bfin_pint_regs *)PINT3_MASK_SET,
 655 };
 656
 657 inline unsigned int get_irq_base(u32 bank, u8 bmap)
 658 {
 659         unsigned int irq_base;
 660
 661         if (bank < 2) {         /*PA-PB */
 662                 irq_base = IRQ_PA0 + bmap * 16;
 663         } else {                /*PC-PJ */
 664                 irq_base = IRQ_PC0 + bmap * 16;
 665         }
 666
 667         return irq_base;
 668 }
 669
 670         /* Whenever PINTx_ASSIGN is altered init_pint_lut() must be executed! */
 671 void init_pint_lut(void)
 672 {
 673         u16 bank, bit, irq_base, bit_pos;
 674         u32 pint_assign;
 675         u8 bmap;
 676
 677         memset(irq2pint_lut, IRQ_NOT_AVAIL, sizeof(irq2pint_lut));
 678
 679         for (bank = 0; bank < NR_PINT_SYS_IRQS; bank++) {
 680
 681                 pint_assign = pint[bank]->assign;
 682
 683                 for (bit = 0; bit < NR_PINT_BITS; bit++) {
 684
 685                         bmap = (pint_assign >> ((bit / 8) * 8)) & 0xFF;
 686
 687                         irq_base = get_irq_base(bank, bmap);
 688
 689                         irq_base += (bit % 8) + ((bit / 8) & 1 ? 8 : 0);
 690                         bit_pos = bit + bank * NR_PINT_BITS;
 691
 692                         pint2irq_lut[bit_pos] = irq_base - SYS_IRQS;
 693                         irq2pint_lut[irq_base - SYS_IRQS] = bit_pos;
 694                 }
 695         }
 696 }
 697
 698 static void bfin_gpio_ack_irq(struct irq_data *d)
 699 {
 700         u32 pint_val = irq2pint_lut[d->irq - SYS_IRQS];
 701         u32 pintbit = PINT_BIT(pint_val);
 702         u32 bank = PINT_2_BANK(pint_val);
 703
 704         if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH) {
 705                 if (pint[bank]->invert_set & pintbit)
 706                         pint[bank]->invert_clear = pintbit;
 707                 else
 708                         pint[bank]->invert_set = pintbit;
 709         }
 710         pint[bank]->request = pintbit;
 711
 712 }
 713
 714 static void bfin_gpio_mask_ack_irq(struct irq_data *d)
 715 {
 716         u32 pint_val = irq2pint_lut[d->irq - SYS_IRQS];
 717         u32 pintbit = PINT_BIT(pint_val);
 718         u32 bank = PINT_2_BANK(pint_val);
 719
 720         if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH) {
 721                 if (pint[bank]->invert_set & pintbit)
 722                         pint[bank]->invert_clear = pintbit;
 723                 else
 724                         pint[bank]->invert_set = pintbit;
 725         }
 726
 727         pint[bank]->request = pintbit;
 728         pint[bank]->mask_clear = pintbit;
 729 }
 730
 731 static void bfin_gpio_mask_irq(struct irq_data *d)
 732 {
 733         u32 pint_val = irq2pint_lut[d->irq - SYS_IRQS];
 734
 735         pint[PINT_2_BANK(pint_val)]->mask_clear = PINT_BIT(pint_val);
 736 }
 737
 738 static void bfin_gpio_unmask_irq(struct irq_data *d)
 739 {
 740         u32 pint_val = irq2pint_lut[d->irq - SYS_IRQS];
 741         u32 pintbit = PINT_BIT(pint_val);
 742         u32 bank = PINT_2_BANK(pint_val);
 743
 744         pint[bank]->mask_set = pintbit;
 745 }
 746
 747 static unsigned int bfin_gpio_irq_startup(struct irq_data *d)
 748 {
 749         unsigned int irq = d->irq;
 750         u32 gpionr = irq_to_gpio(irq);
 751         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 752
 753         if (pint_val == IRQ_NOT_AVAIL) {
 754                 printk(KERN_ERR
 755                 "GPIO IRQ %d :Not in PINT Assign table "
 756                 "Reconfigure Interrupt to Port Assignemt\n", irq);
 757                 return -ENODEV;
 758         }
 759
 760         if (__test_and_set_bit(gpionr, gpio_enabled))
 761                 bfin_gpio_irq_prepare(gpionr);
 762
 763         bfin_gpio_unmask_irq(d);
 764
 765         return 0;
 766 }
 767
 768 static void bfin_gpio_irq_shutdown(struct irq_data *d)
 769 {
 770         u32 gpionr = irq_to_gpio(d->irq);
 771
 772         bfin_gpio_mask_irq(d);
 773         __clear_bit(gpionr, gpio_enabled);
 774         bfin_gpio_irq_free(gpionr);
 775 }
 776
 777 static int bfin_gpio_irq_type(struct irq_data *d, unsigned int type)
 778 {
 779         unsigned int irq = d->irq;
 780         int ret;
 781         char buf[16];
 782         u32 gpionr = irq_to_gpio(irq);
 783         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 784         u32 pintbit = PINT_BIT(pint_val);
 785         u32 bank = PINT_2_BANK(pint_val);
 786
 787         if (pint_val == IRQ_NOT_AVAIL)
 788                 return -ENODEV;
 789
 790         if (type == IRQ_TYPE_PROBE) {
 791                 /* only probe unenabled GPIO interrupt lines */
 792                 if (test_bit(gpionr, gpio_enabled))
 793                         return 0;
 794                 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 795         }
 796
 797         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
 798                     IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
 799
 800                 snprintf(buf, 16, "gpio-irq%d", irq);
 801                 ret = bfin_gpio_irq_request(gpionr, buf);
 802                 if (ret)
 803                         return ret;
 804
 805                 if (__test_and_set_bit(gpionr, gpio_enabled))
 806                         bfin_gpio_irq_prepare(gpionr);
 807
 808         } else {
 809                 __clear_bit(gpionr, gpio_enabled);
 810                 return 0;
 811         }
 812
 813         if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
 814                 pint[bank]->invert_set = pintbit;       /* low or falling edge denoted by one */
 815         else
 816                 pint[bank]->invert_clear = pintbit;     /* high or rising edge denoted by zero */
 817
 818         if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 819             == (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
 820                 if (gpio_get_value(gpionr))
 821                         pint[bank]->invert_set = pintbit;
 822                 else
 823                         pint[bank]->invert_clear = pintbit;
 824         }
 825
 826         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
 827                 pint[bank]->edge_set = pintbit;
 828                 bfin_set_irq_handler(irq, handle_edge_irq);
 829         } else {
 830                 pint[bank]->edge_clear = pintbit;
 831                 bfin_set_irq_handler(irq, handle_level_irq);
 832         }
 833
 834         return 0;
 835 }
 836
 837 #ifdef CONFIG_PM
 838 static int bfin_gpio_set_wake(struct irq_data *d, unsigned int state)
 839 {
 840         u32 pint_irq;
 841         u32 pint_val = irq2pint_lut[d->irq - SYS_IRQS];
 842         u32 bank = PINT_2_BANK(pint_val);
 843
 844         switch (bank) {
 845         case 0:
 846                 pint_irq = IRQ_PINT0;
 847                 break;
 848         case 2:
 849                 pint_irq = IRQ_PINT2;
 850                 break;
 851         case 3:
 852                 pint_irq = IRQ_PINT3;
 853                 break;
 854         case 1:
 855                 pint_irq = IRQ_PINT1;
 856                 break;
 857         default:
 858                 return -EINVAL;
 859         }
 860
 861         bfin_internal_set_wake(pint_irq, state);
 862
 863         return 0;
 864 }
 865 #else
 866 # define bfin_gpio_set_wake NULL
 867 #endif
 868
 869 void bfin_demux_gpio_irq(unsigned int inta_irq,
 870                          struct irq_desc *desc)
 871 {
 872         u32 bank, pint_val;
 873         u32 request, irq;
 874
 875         switch (inta_irq) {
 876         case IRQ_PINT0:
 877                 bank = 0;
 878                 break;
 879         case IRQ_PINT2:
 880                 bank = 2;
 881                 break;
 882         case IRQ_PINT3:
 883                 bank = 3;
 884                 break;
 885         case IRQ_PINT1:
 886                 bank = 1;
 887                 break;
 888         default:
 889                 return;
 890         }
 891
 892         pint_val = bank * NR_PINT_BITS;
 893
 894         request = pint[bank]->request;
 895
 896         while (request) {
 897                 if (request & 1) {
 898                         irq = pint2irq_lut[pint_val] + SYS_IRQS;
 899                         bfin_handle_irq(irq);
 900                 }
 901                 pint_val++;
 902                 request >>= 1;
 903         }
 904
 905 }
 906 #endif
 907
 908 static struct irq_chip bfin_gpio_irqchip = {
 909         .name = "GPIO",
 910         .irq_ack = bfin_gpio_ack_irq,
 911         .irq_mask = bfin_gpio_mask_irq,
 912         .irq_mask_ack = bfin_gpio_mask_ack_irq,
 913         .irq_unmask = bfin_gpio_unmask_irq,
 914         .irq_disable = bfin_gpio_mask_irq,
 915         .irq_enable = bfin_gpio_unmask_irq,
 916         .irq_set_type = bfin_gpio_irq_type,
 917         .irq_startup = bfin_gpio_irq_startup,
 918         .irq_shutdown = bfin_gpio_irq_shutdown,
 919         .irq_set_wake = bfin_gpio_set_wake,
 920 };
 921
 922 void __cpuinit init_exception_vectors(void)
 923 {
 924         /* cannot program in software:
 925          * evt0 - emulation (jtag)
 926          * evt1 - reset
 927          */
 928         bfin_write_EVT2(evt_nmi);
 929         bfin_write_EVT3(trap);
 930         bfin_write_EVT5(evt_ivhw);
 931         bfin_write_EVT6(evt_timer);
 932         bfin_write_EVT7(evt_evt7);
 933         bfin_write_EVT8(evt_evt8);
 934         bfin_write_EVT9(evt_evt9);
 935         bfin_write_EVT10(evt_evt10);
 936         bfin_write_EVT11(evt_evt11);
 937         bfin_write_EVT12(evt_evt12);
 938         bfin_write_EVT13(evt_evt13);
 939         bfin_write_EVT14(evt_evt14);
 940         bfin_write_EVT15(evt_system_call);
 941         CSYNC();
 942 }
 943
 944 /*
 945  * This function should be called during kernel startup to initialize
 946  * the BFin IRQ handling routines.
 947  */
 948
 949 int __init init_arch_irq(void)
 950 {
 951         int irq;
 952         unsigned long ilat = 0;
 953
 954         /*  Disable all the peripheral intrs  - page 4-29 HW Ref manual */
 955 #ifdef SIC_IMASK0
 956         bfin_write_SIC_IMASK0(SIC_UNMASK_ALL);
 957         bfin_write_SIC_IMASK1(SIC_UNMASK_ALL);
 958 # ifdef SIC_IMASK2
 959         bfin_write_SIC_IMASK2(SIC_UNMASK_ALL);
 960 # endif
 961 # ifdef CONFIG_SMP
 962         bfin_write_SICB_IMASK0(SIC_UNMASK_ALL);
 963         bfin_write_SICB_IMASK1(SIC_UNMASK_ALL);
 964 # endif
 965 #else
 966         bfin_write_SIC_IMASK(SIC_UNMASK_ALL);
 967 #endif
 968
 969         local_irq_disable();
 970
 971 #if BFIN_GPIO_PINT
 972 # ifdef CONFIG_PINTx_REASSIGN
 973         pint[0]->assign = CONFIG_PINT0_ASSIGN;
 974         pint[1]->assign = CONFIG_PINT1_ASSIGN;
 975         pint[2]->assign = CONFIG_PINT2_ASSIGN;
 976         pint[3]->assign = CONFIG_PINT3_ASSIGN;
 977 # endif
 978         /* Whenever PINTx_ASSIGN is altered init_pint_lut() must be executed! */
 979         init_pint_lut();
 980 #endif
 981
 982         for (irq = 0; irq <= SYS_IRQS; irq++) {
 983                 if (irq <= IRQ_CORETMR)
 984                         irq_set_chip(irq, &bfin_core_irqchip);
 985                 else
 986                         irq_set_chip(irq, &bfin_internal_irqchip);
 987
 988                 switch (irq) {
 989 #if BFIN_GPIO_PINT
 990                 case IRQ_PINT0:
 991                 case IRQ_PINT1:
 992                 case IRQ_PINT2:
 993                 case IRQ_PINT3:
 994 #elif defined(BF537_FAMILY)
 995                 case IRQ_PH_INTA_MAC_RX:
 996                 case IRQ_PF_INTA_PG_INTA:
 997 #elif defined(BF533_FAMILY)
 998                 case IRQ_PROG_INTA:
 999 #elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
1000                 case IRQ_PORTF_INTA:
1001                 case IRQ_PORTG_INTA:
1002                 case IRQ_PORTH_INTA:
1003 #elif defined(CONFIG_BF561)
1004                 case IRQ_PROG0_INTA:
1005                 case IRQ_PROG1_INTA:
1006                 case IRQ_PROG2_INTA:
1007 #elif defined(BF538_FAMILY)
1008                 case IRQ_PORTF_INTA:
1009 #endif
1010                         irq_set_chained_handler(irq, bfin_demux_gpio_irq);
1011                         break;
1012 #if defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)
1013                 case IRQ_MAC_ERROR:
1014                         irq_set_chained_handler(irq,
1015                                                 bfin_demux_mac_status_irq);
1016                         break;
1017 #endif
1018 #ifdef CONFIG_SMP
1019                 case IRQ_SUPPLE_0:
1020                 case IRQ_SUPPLE_1:
1021                         irq_set_handler(irq, handle_percpu_irq);
1022                         break;
1023 #endif
1024
1025 #ifdef CONFIG_TICKSOURCE_CORETMR
1026                 case IRQ_CORETMR:
1027 # ifdef CONFIG_SMP
1028                         irq_set_handler(irq, handle_percpu_irq);
1029 # else
1030                         irq_set_handler(irq, handle_simple_irq);
1031 # endif
1032                         break;
1033 #endif
1034
1035 #ifdef CONFIG_TICKSOURCE_GPTMR0
1036                 case IRQ_TIMER0:
1037                         irq_set_handler(irq, handle_simple_irq);
1038                         break;
1039 #endif
1040
1041                 default:
1042 #ifdef CONFIG_IPIPE
1043                         irq_set_handler(irq, handle_level_irq);
1044 #else
1045                         irq_set_handler(irq, handle_simple_irq);
1046 #endif
1047                         break;
1048                 }
1049         }
1050
1051         init_mach_irq();
1052
1053 #if defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE)
1054         for (irq = IRQ_MAC_PHYINT; irq <= IRQ_MAC_STMDONE; irq++)
1055                 irq_set_chip_and_handler(irq, &bfin_mac_status_irqchip,
1056                                          handle_level_irq);
1057 #endif
1058         /* if configured as edge, then will be changed to do_edge_IRQ */
1059         for (irq = GPIO_IRQ_BASE;
1060                 irq < (GPIO_IRQ_BASE + MAX_BLACKFIN_GPIOS); irq++)
1061                 irq_set_chip_and_handler(irq, &bfin_gpio_irqchip,
1062                                          handle_level_irq);
1063
1064         bfin_write_IMASK(0);
1065         CSYNC();
1066         ilat = bfin_read_ILAT();
1067         CSYNC();
1068         bfin_write_ILAT(ilat);
1069         CSYNC();
1070
1071         printk(KERN_INFO "Configuring Blackfin Priority Driven Interrupts\n");
1072         /* IMASK=xxx is equivalent to STI xx or bfin_irq_flags=xx,
1073          * local_irq_enable()
1074          */
1075         program_IAR();
1076         /* Therefore it's better to setup IARs before interrupts enabled */
1077         search_IAR();
1078
1079         /* Enable interrupts IVG7-15 */
1080         bfin_irq_flags |= IMASK_IVG15 |
1081             IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
1082             IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 | IMASK_IVGHW;
1083
1084         /* This implicitly covers ANOMALY_05000171
1085          * Boot-ROM code modifies SICA_IWRx wakeup registers
1086          */
1087 #ifdef SIC_IWR0
1088         bfin_write_SIC_IWR0(IWR_DISABLE_ALL);
1089 # ifdef SIC_IWR1
1090         /* BF52x/BF51x system reset does not properly reset SIC_IWR1 which
1091          * will screw up the bootrom as it relies on MDMA0/1 waking it
1092          * up from IDLE instructions.  See this report for more info:
1093          * http://blackfin.uclinux.org/gf/tracker/4323
1094          */
1095         if (ANOMALY_05000435)
1096                 bfin_write_SIC_IWR1(IWR_ENABLE(10) | IWR_ENABLE(11));
1097         else
1098                 bfin_write_SIC_IWR1(IWR_DISABLE_ALL);
1099 # endif
1100 # ifdef SIC_IWR2
1101         bfin_write_SIC_IWR2(IWR_DISABLE_ALL);
1102 # endif
1103 #else
1104         bfin_write_SIC_IWR(IWR_DISABLE_ALL);
1105 #endif
1106
1107         return 0;
1108 }
1109
1110 #ifdef CONFIG_DO_IRQ_L1
1111 __attribute__((l1_text))
1112 #endif
1113 static int vec_to_irq(int vec)
1114 {
1115         struct ivgx *ivg = ivg7_13[vec - IVG7].ifirst;
1116         struct ivgx *ivg_stop = ivg7_13[vec - IVG7].istop;
1117         unsigned long sic_status[3];
1118
1119         if (likely(vec == EVT_IVTMR_P))
1120                 return IRQ_CORETMR;
1121
1122 #ifdef SIC_ISR
1123         sic_status[0] = bfin_read_SIC_IMASK() & bfin_read_SIC_ISR();
1124 #else
1125         if (smp_processor_id()) {
1126 # ifdef SICB_ISR0
1127                 /* This will be optimized out in UP mode. */
1128                 sic_status[0] = bfin_read_SICB_ISR0() & bfin_read_SICB_IMASK0();
1129                 sic_status[1] = bfin_read_SICB_ISR1() & bfin_read_SICB_IMASK1();
1130 # endif
1131         } else {
1132                 sic_status[0] = bfin_read_SIC_ISR0() & bfin_read_SIC_IMASK0();
1133                 sic_status[1] = bfin_read_SIC_ISR1() & bfin_read_SIC_IMASK1();
1134         }
1135 #endif
1136 #ifdef SIC_ISR2
1137         sic_status[2] = bfin_read_SIC_ISR2() & bfin_read_SIC_IMASK2();
1138 #endif
1139
1140         for (;; ivg++) {
1141                 if (ivg >= ivg_stop)
1142                         return -1;
1143 #ifdef SIC_ISR
1144                 if (sic_status[0] & ivg->isrflag)
1145 #else
1146                 if (sic_status[(ivg->irqno - IVG7) / 32] & ivg->isrflag)
1147 #endif
1148                         return ivg->irqno;
1149         }
1150 }
1151
1152 #ifdef CONFIG_DO_IRQ_L1
1153 __attribute__((l1_text))
1154 #endif
1155 void do_irq(int vec, struct pt_regs *fp)
1156 {
1157         int irq = vec_to_irq(vec);
1158         if (irq == -1)
1159                 return;
1160         asm_do_IRQ(irq, fp);
1161 }
1162
1163 #ifdef CONFIG_IPIPE
1164
1165 int __ipipe_get_irq_priority(unsigned irq)
1166 {
1167         int ient, prio;
1168
1169         if (irq <= IRQ_CORETMR)
1170                 return irq;
1171
1172         for (ient = 0; ient < NR_PERI_INTS; ient++) {
1173                 struct ivgx *ivg = ivg_table + ient;
1174                 if (ivg->irqno == irq) {
1175                         for (prio = 0; prio <= IVG13-IVG7; prio++) {
1176                                 if (ivg7_13[prio].ifirst <= ivg &&
1177                                     ivg7_13[prio].istop > ivg)
1178                                         return IVG7 + prio;
1179                         }
1180                 }
1181         }
1182
1183         return IVG15;
1184 }
1185
1186 /* Hw interrupts are disabled on entry (check SAVE_CONTEXT). */
1187 #ifdef CONFIG_DO_IRQ_L1
1188 __attribute__((l1_text))
1189 #endif
1190 asmlinkage int __ipipe_grab_irq(int vec, struct pt_regs *regs)
1191 {
1192         struct ipipe_percpu_domain_data *p = ipipe_root_cpudom_ptr();
1193         struct ipipe_domain *this_domain = __ipipe_current_domain;
1194         struct ivgx *ivg_stop = ivg7_13[vec-IVG7].istop;
1195         struct ivgx *ivg = ivg7_13[vec-IVG7].ifirst;
1196         int irq, s = 0;
1197
1198         irq = vec_to_irq(vec);
1199         if (irq == -1)
1200                 return 0;
1201
1202         if (irq == IRQ_SYSTMR) {
1203 #if !defined(CONFIG_GENERIC_CLOCKEVENTS) || defined(CONFIG_TICKSOURCE_GPTMR0)
1204                 bfin_write_TIMER_STATUS(1); /* Latch TIMIL0 */
1205 #endif
1206                 /* This is basically what we need from the register frame. */
1207                 __raw_get_cpu_var(__ipipe_tick_regs).ipend = regs->ipend;
1208                 __raw_get_cpu_var(__ipipe_tick_regs).pc = regs->pc;
1209                 if (this_domain != ipipe_root_domain)
1210                         __raw_get_cpu_var(__ipipe_tick_regs).ipend &= ~0x10;
1211                 else
1212                         __raw_get_cpu_var(__ipipe_tick_regs).ipend |= 0x10;
1213         }
1214
1215         /*
1216          * We don't want Linux interrupt handlers to run at the
1217          * current core priority level (i.e. < EVT15), since this
1218          * might delay other interrupts handled by a high priority
1219          * domain. Here is what we do instead:
1220          *
1221          * - we raise the SYNCDEFER bit to prevent
1222          * __ipipe_handle_irq() to sync the pipeline for the root
1223          * stage for the incoming interrupt. Upon return, that IRQ is
1224          * pending in the interrupt log.
1225          *
1226          * - we raise the TIF_IRQ_SYNC bit for the current thread, so
1227          * that _schedule_and_signal_from_int will eventually sync the
1228          * pipeline from EVT15.
1229          */
1230         if (this_domain == ipipe_root_domain) {
1231                 s = __test_and_set_bit(IPIPE_SYNCDEFER_FLAG, &p->status);
1232                 barrier();
1233         }
1234
1235         ipipe_trace_irq_entry(irq);
1236         __ipipe_handle_irq(irq, regs);
1237         ipipe_trace_irq_exit(irq);
1238
1239         if (user_mode(regs) &&
1240             !ipipe_test_foreign_stack() &&
1241             (current->ipipe_flags & PF_EVTRET) != 0) {
1242                 /*
1243                  * Testing for user_regs() does NOT fully eliminate
1244                  * foreign stack contexts, because of the forged
1245                  * interrupt returns we do through
1246                  * __ipipe_call_irqtail. In that case, we might have
1247                  * preempted a foreign stack context in a high
1248                  * priority domain, with a single interrupt level now
1249                  * pending after the irqtail unwinding is done. In
1250                  * which case user_mode() is now true, and the event
1251                  * gets dispatched spuriously.
1252                  */
1253                 current->ipipe_flags &= ~PF_EVTRET;
1254                 __ipipe_dispatch_event(IPIPE_EVENT_RETURN, regs);
1255         }
1256
1257         if (this_domain == ipipe_root_domain) {
1258                 set_thread_flag(TIF_IRQ_SYNC);
1259                 if (!s) {
1260                         __clear_bit(IPIPE_SYNCDEFER_FLAG, &p->status);
1261                         return !test_bit(IPIPE_STALL_FLAG, &p->status);
1262                 }
1263         }
1264
1265         return 0;
1266 }
1267
1268 #endif /* CONFIG_IPIPE */