git.oblomov.eu Git - linux-2.6/blob - arch/blackfin/mach-common/ints-priority.c

   1 /*
   2  * File:         arch/blackfin/mach-common/ints-priority.c
   3  *
   4  * Description:  Set up the interrupt priorities
   5  *
   6  * Modified:
   7  *               1996 Roman Zippel
   8  *               1999 D. Jeff Dionne <jeff@uclinux.org>
   9  *               2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca>
  10  *               2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca>
  11  *               2003 Metrowerks/Motorola
  12  *               2003 Bas Vermeulen <bas@buyways.nl>
  13  *               Copyright 2004-2008 Analog Devices Inc.
  14  *
  15  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License as published by
  19  * the Free Software Foundation; either version 2 of the License, or
  20  * (at your option) any later version.
  21  *
  22  * This program is distributed in the hope that it will be useful,
  23  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25  * GNU General Public License for more details.
  26  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, see the file COPYING, or write
  29  * to the Free Software Foundation, Inc.,
  30  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  31  */
  32
  33 #include <linux/module.h>
  34 #include <linux/kernel_stat.h>
  35 #include <linux/seq_file.h>
  36 #include <linux/irq.h>
  37 #ifdef CONFIG_IPIPE
  38 #include <linux/ipipe.h>
  39 #endif
  40 #ifdef CONFIG_KGDB
  41 #include <linux/kgdb.h>
  42 #endif
  43 #include <asm/traps.h>
  44 #include <asm/blackfin.h>
  45 #include <asm/gpio.h>
  46 #include <asm/irq_handler.h>
  47
  48 #define SIC_SYSIRQ(irq) (irq - (IRQ_CORETMR + 1))
  49
  50 #ifdef BF537_FAMILY
  51 # define BF537_GENERIC_ERROR_INT_DEMUX
  52 #else
  53 # undef BF537_GENERIC_ERROR_INT_DEMUX
  54 #endif
  55
  56 /*
  57  * NOTES:
  58  * - we have separated the physical Hardware interrupt from the
  59  * levels that the LINUX kernel sees (see the description in irq.h)
  60  * -
  61  */
  62
  63 #ifndef CONFIG_SMP
  64 /* Initialize this to an actual value to force it into the .data
  65  * section so that we know it is properly initialized at entry into
  66  * the kernel but before bss is initialized to zero (which is where
  67  * it would live otherwise).  The 0x1f magic represents the IRQs we
  68  * cannot actually mask out in hardware.
  69  */
  70 unsigned long bfin_irq_flags = 0x1f;
  71 EXPORT_SYMBOL(bfin_irq_flags);
  72 #endif
  73
  74 /* The number of spurious interrupts */
  75 atomic_t num_spurious;
  76
  77 #ifdef CONFIG_PM
  78 unsigned long bfin_sic_iwr[3];  /* Up to 3 SIC_IWRx registers */
  79 unsigned vr_wakeup;
  80 #endif
  81
  82 struct ivgx {
  83         /* irq number for request_irq, available in mach-bf5xx/irq.h */
  84         unsigned int irqno;
  85         /* corresponding bit in the SIC_ISR register */
  86         unsigned int isrflag;
  87 } ivg_table[NR_PERI_INTS];
  88
  89 struct ivg_slice {
  90         /* position of first irq in ivg_table for given ivg */
  91         struct ivgx *ifirst;
  92         struct ivgx *istop;
  93 } ivg7_13[IVG13 - IVG7 + 1];
  94
  95
  96 /*
  97  * Search SIC_IAR and fill tables with the irqvalues
  98  * and their positions in the SIC_ISR register.
  99  */
 100 static void __init search_IAR(void)
 101 {
 102         unsigned ivg, irq_pos = 0;
 103         for (ivg = 0; ivg <= IVG13 - IVG7; ivg++) {
 104                 int irqn;
 105
 106                 ivg7_13[ivg].istop = ivg7_13[ivg].ifirst = &ivg_table[irq_pos];
 107
 108                 for (irqn = 0; irqn < NR_PERI_INTS; irqn++) {
 109                         int iar_shift = (irqn & 7) * 4;
 110                                 if (ivg == (0xf &
 111 #if defined(CONFIG_BF52x) || defined(CONFIG_BF538) \
 112         || defined(CONFIG_BF539) || defined(CONFIG_BF51x)
 113                              bfin_read32((unsigned long *)SIC_IAR0 +
 114                                          ((irqn % 32) >> 3) + ((irqn / 32) *
 115                                          ((SIC_IAR4 - SIC_IAR0) / 4))) >> iar_shift)) {
 116 #else
 117                              bfin_read32((unsigned long *)SIC_IAR0 +
 118                                          (irqn >> 3)) >> iar_shift)) {
 119 #endif
 120                                 ivg_table[irq_pos].irqno = IVG7 + irqn;
 121                                 ivg_table[irq_pos].isrflag = 1 << (irqn % 32);
 122                                 ivg7_13[ivg].istop++;
 123                                 irq_pos++;
 124                         }
 125                 }
 126         }
 127 }
 128
 129 /*
 130  * This is for core internal IRQs
 131  */
 132
 133 static void bfin_ack_noop(unsigned int irq)
 134 {
 135         /* Dummy function.  */
 136 }
 137
 138 static void bfin_core_mask_irq(unsigned int irq)
 139 {
 140         bfin_irq_flags &= ~(1 << irq);
 141         if (!irqs_disabled_hw())
 142                 local_irq_enable_hw();
 143 }
 144
 145 static void bfin_core_unmask_irq(unsigned int irq)
 146 {
 147         bfin_irq_flags |= 1 << irq;
 148         /*
 149          * If interrupts are enabled, IMASK must contain the same value
 150          * as bfin_irq_flags.  Make sure that invariant holds.  If interrupts
 151          * are currently disabled we need not do anything; one of the
 152          * callers will take care of setting IMASK to the proper value
 153          * when reenabling interrupts.
 154          * local_irq_enable just does "STI bfin_irq_flags", so it's exactly
 155          * what we need.
 156          */
 157         if (!irqs_disabled_hw())
 158                 local_irq_enable_hw();
 159         return;
 160 }
 161
 162 static void bfin_internal_mask_irq(unsigned int irq)
 163 {
 164         unsigned long flags;
 165
 166 #ifdef CONFIG_BF53x
 167         local_irq_save_hw(flags);
 168         bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() &
 169                              ~(1 << SIC_SYSIRQ(irq)));
 170 #else
 171         unsigned mask_bank, mask_bit;
 172         local_irq_save_hw(flags);
 173         mask_bank = SIC_SYSIRQ(irq) / 32;
 174         mask_bit = SIC_SYSIRQ(irq) % 32;
 175         bfin_write_SIC_IMASK(mask_bank, bfin_read_SIC_IMASK(mask_bank) &
 176                              ~(1 << mask_bit));
 177 #ifdef CONFIG_SMP
 178         bfin_write_SICB_IMASK(mask_bank, bfin_read_SICB_IMASK(mask_bank) &
 179                              ~(1 << mask_bit));
 180 #endif
 181 #endif
 182         local_irq_restore_hw(flags);
 183 }
 184
 185 static void bfin_internal_unmask_irq(unsigned int irq)
 186 {
 187         unsigned long flags;
 188
 189 #ifdef CONFIG_BF53x
 190         local_irq_save_hw(flags);
 191         bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() |
 192                              (1 << SIC_SYSIRQ(irq)));
 193 #else
 194         unsigned mask_bank, mask_bit;
 195         local_irq_save_hw(flags);
 196         mask_bank = SIC_SYSIRQ(irq) / 32;
 197         mask_bit = SIC_SYSIRQ(irq) % 32;
 198         bfin_write_SIC_IMASK(mask_bank, bfin_read_SIC_IMASK(mask_bank) |
 199                              (1 << mask_bit));
 200 #ifdef CONFIG_SMP
 201         bfin_write_SICB_IMASK(mask_bank, bfin_read_SICB_IMASK(mask_bank) |
 202                              (1 << mask_bit));
 203 #endif
 204 #endif
 205         local_irq_restore_hw(flags);
 206 }
 207
 208 #ifdef CONFIG_PM
 209 int bfin_internal_set_wake(unsigned int irq, unsigned int state)
 210 {
 211         u32 bank, bit, wakeup = 0;
 212         unsigned long flags;
 213         bank = SIC_SYSIRQ(irq) / 32;
 214         bit = SIC_SYSIRQ(irq) % 32;
 215
 216         switch (irq) {
 217 #ifdef IRQ_RTC
 218         case IRQ_RTC:
 219         wakeup |= WAKE;
 220         break;
 221 #endif
 222 #ifdef IRQ_CAN0_RX
 223         case IRQ_CAN0_RX:
 224         wakeup |= CANWE;
 225         break;
 226 #endif
 227 #ifdef IRQ_CAN1_RX
 228         case IRQ_CAN1_RX:
 229         wakeup |= CANWE;
 230         break;
 231 #endif
 232 #ifdef IRQ_USB_INT0
 233         case IRQ_USB_INT0:
 234         wakeup |= USBWE;
 235         break;
 236 #endif
 237 #ifdef IRQ_KEY
 238         case IRQ_KEY:
 239         wakeup |= KPADWE;
 240         break;
 241 #endif
 242 #ifdef CONFIG_BF54x
 243         case IRQ_CNT:
 244         wakeup |= ROTWE;
 245         break;
 246 #endif
 247         default:
 248         break;
 249         }
 250
 251         local_irq_save_hw(flags);
 252
 253         if (state) {
 254                 bfin_sic_iwr[bank] |= (1 << bit);
 255                 vr_wakeup  |= wakeup;
 256
 257         } else {
 258                 bfin_sic_iwr[bank] &= ~(1 << bit);
 259                 vr_wakeup  &= ~wakeup;
 260         }
 261
 262         local_irq_restore_hw(flags);
 263
 264         return 0;
 265 }
 266 #endif
 267
 268 static struct irq_chip bfin_core_irqchip = {
 269         .name = "CORE",
 270         .ack = bfin_ack_noop,
 271         .mask = bfin_core_mask_irq,
 272         .unmask = bfin_core_unmask_irq,
 273 };
 274
 275 static struct irq_chip bfin_internal_irqchip = {
 276         .name = "INTN",
 277         .ack = bfin_ack_noop,
 278         .mask = bfin_internal_mask_irq,
 279         .unmask = bfin_internal_unmask_irq,
 280         .mask_ack = bfin_internal_mask_irq,
 281         .disable = bfin_internal_mask_irq,
 282         .enable = bfin_internal_unmask_irq,
 283 #ifdef CONFIG_PM
 284         .set_wake = bfin_internal_set_wake,
 285 #endif
 286 };
 287
 288 static void bfin_handle_irq(unsigned irq)
 289 {
 290 #ifdef CONFIG_IPIPE
 291         struct pt_regs regs;    /* Contents not used. */
 292         ipipe_trace_irq_entry(irq);
 293         __ipipe_handle_irq(irq, &regs);
 294         ipipe_trace_irq_exit(irq);
 295 #else /* !CONFIG_IPIPE */
 296         struct irq_desc *desc = irq_desc + irq;
 297         desc->handle_irq(irq, desc);
 298 #endif  /* !CONFIG_IPIPE */
 299 }
 300
 301 #ifdef BF537_GENERIC_ERROR_INT_DEMUX
 302 static int error_int_mask;
 303
 304 static void bfin_generic_error_mask_irq(unsigned int irq)
 305 {
 306         error_int_mask &= ~(1L << (irq - IRQ_PPI_ERROR));
 307
 308         if (!error_int_mask)
 309                 bfin_internal_mask_irq(IRQ_GENERIC_ERROR);
 310 }
 311
 312 static void bfin_generic_error_unmask_irq(unsigned int irq)
 313 {
 314         bfin_internal_unmask_irq(IRQ_GENERIC_ERROR);
 315         error_int_mask |= 1L << (irq - IRQ_PPI_ERROR);
 316 }
 317
 318 static struct irq_chip bfin_generic_error_irqchip = {
 319         .name = "ERROR",
 320         .ack = bfin_ack_noop,
 321         .mask_ack = bfin_generic_error_mask_irq,
 322         .mask = bfin_generic_error_mask_irq,
 323         .unmask = bfin_generic_error_unmask_irq,
 324 };
 325
 326 static void bfin_demux_error_irq(unsigned int int_err_irq,
 327                                  struct irq_desc *inta_desc)
 328 {
 329         int irq = 0;
 330
 331 #if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
 332         if (bfin_read_EMAC_SYSTAT() & EMAC_ERR_MASK)
 333                 irq = IRQ_MAC_ERROR;
 334         else
 335 #endif
 336         if (bfin_read_SPORT0_STAT() & SPORT_ERR_MASK)
 337                 irq = IRQ_SPORT0_ERROR;
 338         else if (bfin_read_SPORT1_STAT() & SPORT_ERR_MASK)
 339                 irq = IRQ_SPORT1_ERROR;
 340         else if (bfin_read_PPI_STATUS() & PPI_ERR_MASK)
 341                 irq = IRQ_PPI_ERROR;
 342         else if (bfin_read_CAN_GIF() & CAN_ERR_MASK)
 343                 irq = IRQ_CAN_ERROR;
 344         else if (bfin_read_SPI_STAT() & SPI_ERR_MASK)
 345                 irq = IRQ_SPI_ERROR;
 346         else if ((bfin_read_UART0_IIR() & UART_ERR_MASK_STAT1) &&
 347                  (bfin_read_UART0_IIR() & UART_ERR_MASK_STAT0))
 348                 irq = IRQ_UART0_ERROR;
 349         else if ((bfin_read_UART1_IIR() & UART_ERR_MASK_STAT1) &&
 350                  (bfin_read_UART1_IIR() & UART_ERR_MASK_STAT0))
 351                 irq = IRQ_UART1_ERROR;
 352
 353         if (irq) {
 354                 if (error_int_mask & (1L << (irq - IRQ_PPI_ERROR)))
 355                         bfin_handle_irq(irq);
 356                 else {
 357
 358                         switch (irq) {
 359                         case IRQ_PPI_ERROR:
 360                                 bfin_write_PPI_STATUS(PPI_ERR_MASK);
 361                                 break;
 362 #if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
 363                         case IRQ_MAC_ERROR:
 364                                 bfin_write_EMAC_SYSTAT(EMAC_ERR_MASK);
 365                                 break;
 366 #endif
 367                         case IRQ_SPORT0_ERROR:
 368                                 bfin_write_SPORT0_STAT(SPORT_ERR_MASK);
 369                                 break;
 370
 371                         case IRQ_SPORT1_ERROR:
 372                                 bfin_write_SPORT1_STAT(SPORT_ERR_MASK);
 373                                 break;
 374
 375                         case IRQ_CAN_ERROR:
 376                                 bfin_write_CAN_GIS(CAN_ERR_MASK);
 377                                 break;
 378
 379                         case IRQ_SPI_ERROR:
 380                                 bfin_write_SPI_STAT(SPI_ERR_MASK);
 381                                 break;
 382
 383                         default:
 384                                 break;
 385                         }
 386
 387                         pr_debug("IRQ %d:"
 388                                  " MASKED PERIPHERAL ERROR INTERRUPT ASSERTED\n",
 389                                  irq);
 390                 }
 391         } else
 392                 printk(KERN_ERR
 393                        "%s : %s : LINE %d :\nIRQ ?: PERIPHERAL ERROR"
 394                        " INTERRUPT ASSERTED BUT NO SOURCE FOUND\n",
 395                        __func__, __FILE__, __LINE__);
 396
 397 }
 398 #endif                          /* BF537_GENERIC_ERROR_INT_DEMUX */
 399
 400 static inline void bfin_set_irq_handler(unsigned irq, irq_flow_handler_t handle)
 401 {
 402 #ifdef CONFIG_IPIPE
 403         _set_irq_handler(irq, handle_level_irq);
 404 #else
 405         struct irq_desc *desc = irq_desc + irq;
 406         /* May not call generic set_irq_handler() due to spinlock
 407            recursion. */
 408         desc->handle_irq = handle;
 409 #endif
 410 }
 411
 412 static DECLARE_BITMAP(gpio_enabled, MAX_BLACKFIN_GPIOS);
 413 extern void bfin_gpio_irq_prepare(unsigned gpio);
 414
 415 #if !defined(CONFIG_BF54x)
 416
 417 static void bfin_gpio_ack_irq(unsigned int irq)
 418 {
 419         /* AFAIK ack_irq in case mask_ack is provided
 420          * get's only called for edge sense irqs
 421          */
 422         set_gpio_data(irq_to_gpio(irq), 0);
 423 }
 424
 425 static void bfin_gpio_mask_ack_irq(unsigned int irq)
 426 {
 427         struct irq_desc *desc = irq_desc + irq;
 428         u32 gpionr = irq_to_gpio(irq);
 429
 430         if (desc->handle_irq == handle_edge_irq)
 431                 set_gpio_data(gpionr, 0);
 432
 433         set_gpio_maska(gpionr, 0);
 434 }
 435
 436 static void bfin_gpio_mask_irq(unsigned int irq)
 437 {
 438         set_gpio_maska(irq_to_gpio(irq), 0);
 439 }
 440
 441 static void bfin_gpio_unmask_irq(unsigned int irq)
 442 {
 443         set_gpio_maska(irq_to_gpio(irq), 1);
 444 }
 445
 446 static unsigned int bfin_gpio_irq_startup(unsigned int irq)
 447 {
 448         u32 gpionr = irq_to_gpio(irq);
 449
 450         if (__test_and_set_bit(gpionr, gpio_enabled))
 451                 bfin_gpio_irq_prepare(gpionr);
 452
 453         bfin_gpio_unmask_irq(irq);
 454
 455         return 0;
 456 }
 457
 458 static void bfin_gpio_irq_shutdown(unsigned int irq)
 459 {
 460         u32 gpionr = irq_to_gpio(irq);
 461
 462         bfin_gpio_mask_irq(irq);
 463         __clear_bit(gpionr, gpio_enabled);
 464         bfin_gpio_irq_free(gpionr);
 465 }
 466
 467 static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 468 {
 469         int ret;
 470         char buf[16];
 471         u32 gpionr = irq_to_gpio(irq);
 472
 473         if (type == IRQ_TYPE_PROBE) {
 474                 /* only probe unenabled GPIO interrupt lines */
 475                 if (__test_bit(gpionr, gpio_enabled))
 476                         return 0;
 477                 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 478         }
 479
 480         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
 481                     IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
 482
 483                 snprintf(buf, 16, "gpio-irq%d", irq);
 484                 ret = bfin_gpio_irq_request(gpionr, buf);
 485                 if (ret)
 486                         return ret;
 487
 488                 if (__test_and_set_bit(gpionr, gpio_enabled))
 489                         bfin_gpio_irq_prepare(gpionr);
 490
 491         } else {
 492                 __clear_bit(gpionr, gpio_enabled);
 493                 return 0;
 494         }
 495
 496         set_gpio_inen(gpionr, 0);
 497         set_gpio_dir(gpionr, 0);
 498
 499         if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 500             == (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 501                 set_gpio_both(gpionr, 1);
 502         else
 503                 set_gpio_both(gpionr, 0);
 504
 505         if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
 506                 set_gpio_polar(gpionr, 1);      /* low or falling edge denoted by one */
 507         else
 508                 set_gpio_polar(gpionr, 0);      /* high or rising edge denoted by zero */
 509
 510         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
 511                 set_gpio_edge(gpionr, 1);
 512                 set_gpio_inen(gpionr, 1);
 513                 set_gpio_data(gpionr, 0);
 514
 515         } else {
 516                 set_gpio_edge(gpionr, 0);
 517                 set_gpio_inen(gpionr, 1);
 518         }
 519
 520         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 521                 bfin_set_irq_handler(irq, handle_edge_irq);
 522         else
 523                 bfin_set_irq_handler(irq, handle_level_irq);
 524
 525         return 0;
 526 }
 527
 528 #ifdef CONFIG_PM
 529 int bfin_gpio_set_wake(unsigned int irq, unsigned int state)
 530 {
 531         unsigned gpio = irq_to_gpio(irq);
 532
 533         if (state)
 534                 gpio_pm_wakeup_request(gpio, PM_WAKE_IGNORE);
 535         else
 536                 gpio_pm_wakeup_free(gpio);
 537
 538         return 0;
 539 }
 540 #endif
 541
 542 static void bfin_demux_gpio_irq(unsigned int inta_irq,
 543                                 struct irq_desc *desc)
 544 {
 545         unsigned int i, gpio, mask, irq, search = 0;
 546
 547         switch (inta_irq) {
 548 #if defined(CONFIG_BF53x)
 549         case IRQ_PROG_INTA:
 550                 irq = IRQ_PF0;
 551                 search = 1;
 552                 break;
 553 # if defined(BF537_FAMILY) && !(defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
 554         case IRQ_MAC_RX:
 555                 irq = IRQ_PH0;
 556                 break;
 557 # endif
 558 #elif defined(CONFIG_BF538) || defined(CONFIG_BF539)
 559         case IRQ_PORTF_INTA:
 560                 irq = IRQ_PF0;
 561                 break;
 562 #elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
 563         case IRQ_PORTF_INTA:
 564                 irq = IRQ_PF0;
 565                 break;
 566         case IRQ_PORTG_INTA:
 567                 irq = IRQ_PG0;
 568                 break;
 569         case IRQ_PORTH_INTA:
 570                 irq = IRQ_PH0;
 571                 break;
 572 #elif defined(CONFIG_BF561)
 573         case IRQ_PROG0_INTA:
 574                 irq = IRQ_PF0;
 575                 break;
 576         case IRQ_PROG1_INTA:
 577                 irq = IRQ_PF16;
 578                 break;
 579         case IRQ_PROG2_INTA:
 580                 irq = IRQ_PF32;
 581                 break;
 582 #endif
 583         default:
 584                 BUG();
 585                 return;
 586         }
 587
 588         if (search) {
 589                 for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
 590                         irq += i;
 591
 592                         mask = get_gpiop_data(i) & get_gpiop_maska(i);
 593
 594                         while (mask) {
 595                                 if (mask & 1)
 596                                         bfin_handle_irq(irq);
 597                                 irq++;
 598                                 mask >>= 1;
 599                         }
 600                 }
 601         } else {
 602                         gpio = irq_to_gpio(irq);
 603                         mask = get_gpiop_data(gpio) & get_gpiop_maska(gpio);
 604
 605                         do {
 606                                 if (mask & 1)
 607                                         bfin_handle_irq(irq);
 608                                 irq++;
 609                                 mask >>= 1;
 610                         } while (mask);
 611         }
 612
 613 }
 614
 615 #else                           /* CONFIG_BF54x */
 616
 617 #define NR_PINT_SYS_IRQS        4
 618 #define NR_PINT_BITS            32
 619 #define NR_PINTS                160
 620 #define IRQ_NOT_AVAIL           0xFF
 621
 622 #define PINT_2_BANK(x)          ((x) >> 5)
 623 #define PINT_2_BIT(x)           ((x) & 0x1F)
 624 #define PINT_BIT(x)             (1 << (PINT_2_BIT(x)))
 625
 626 static unsigned char irq2pint_lut[NR_PINTS];
 627 static unsigned char pint2irq_lut[NR_PINT_SYS_IRQS * NR_PINT_BITS];
 628
 629 struct pin_int_t {
 630         unsigned int mask_set;
 631         unsigned int mask_clear;
 632         unsigned int request;
 633         unsigned int assign;
 634         unsigned int edge_set;
 635         unsigned int edge_clear;
 636         unsigned int invert_set;
 637         unsigned int invert_clear;
 638         unsigned int pinstate;
 639         unsigned int latch;
 640 };
 641
 642 static struct pin_int_t *pint[NR_PINT_SYS_IRQS] = {
 643         (struct pin_int_t *)PINT0_MASK_SET,
 644         (struct pin_int_t *)PINT1_MASK_SET,
 645         (struct pin_int_t *)PINT2_MASK_SET,
 646         (struct pin_int_t *)PINT3_MASK_SET,
 647 };
 648
 649 inline unsigned int get_irq_base(u32 bank, u8 bmap)
 650 {
 651         unsigned int irq_base;
 652
 653         if (bank < 2) {         /*PA-PB */
 654                 irq_base = IRQ_PA0 + bmap * 16;
 655         } else {                /*PC-PJ */
 656                 irq_base = IRQ_PC0 + bmap * 16;
 657         }
 658
 659         return irq_base;
 660 }
 661
 662         /* Whenever PINTx_ASSIGN is altered init_pint_lut() must be executed! */
 663 void init_pint_lut(void)
 664 {
 665         u16 bank, bit, irq_base, bit_pos;
 666         u32 pint_assign;
 667         u8 bmap;
 668
 669         memset(irq2pint_lut, IRQ_NOT_AVAIL, sizeof(irq2pint_lut));
 670
 671         for (bank = 0; bank < NR_PINT_SYS_IRQS; bank++) {
 672
 673                 pint_assign = pint[bank]->assign;
 674
 675                 for (bit = 0; bit < NR_PINT_BITS; bit++) {
 676
 677                         bmap = (pint_assign >> ((bit / 8) * 8)) & 0xFF;
 678
 679                         irq_base = get_irq_base(bank, bmap);
 680
 681                         irq_base += (bit % 8) + ((bit / 8) & 1 ? 8 : 0);
 682                         bit_pos = bit + bank * NR_PINT_BITS;
 683
 684                         pint2irq_lut[bit_pos] = irq_base - SYS_IRQS;
 685                         irq2pint_lut[irq_base - SYS_IRQS] = bit_pos;
 686                 }
 687         }
 688 }
 689
 690 static void bfin_gpio_ack_irq(unsigned int irq)
 691 {
 692         struct irq_desc *desc = irq_desc + irq;
 693         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 694         u32 pintbit = PINT_BIT(pint_val);
 695         u32 bank = PINT_2_BANK(pint_val);
 696
 697         if ((desc->status & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
 698                 if (pint[bank]->invert_set & pintbit)
 699                         pint[bank]->invert_clear = pintbit;
 700                 else
 701                         pint[bank]->invert_set = pintbit;
 702         }
 703         pint[bank]->request = pintbit;
 704
 705 }
 706
 707 static void bfin_gpio_mask_ack_irq(unsigned int irq)
 708 {
 709         struct irq_desc *desc = irq_desc + irq;
 710         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 711         u32 pintbit = PINT_BIT(pint_val);
 712         u32 bank = PINT_2_BANK(pint_val);
 713
 714         if ((desc->status & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
 715                 if (pint[bank]->invert_set & pintbit)
 716                         pint[bank]->invert_clear = pintbit;
 717                 else
 718                         pint[bank]->invert_set = pintbit;
 719         }
 720
 721         pint[bank]->request = pintbit;
 722         pint[bank]->mask_clear = pintbit;
 723 }
 724
 725 static void bfin_gpio_mask_irq(unsigned int irq)
 726 {
 727         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 728
 729         pint[PINT_2_BANK(pint_val)]->mask_clear = PINT_BIT(pint_val);
 730 }
 731
 732 static void bfin_gpio_unmask_irq(unsigned int irq)
 733 {
 734         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 735         u32 pintbit = PINT_BIT(pint_val);
 736         u32 bank = PINT_2_BANK(pint_val);
 737
 738         pint[bank]->request = pintbit;
 739         pint[bank]->mask_set = pintbit;
 740 }
 741
 742 static unsigned int bfin_gpio_irq_startup(unsigned int irq)
 743 {
 744         u32 gpionr = irq_to_gpio(irq);
 745         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 746
 747         if (pint_val == IRQ_NOT_AVAIL) {
 748                 printk(KERN_ERR
 749                 "GPIO IRQ %d :Not in PINT Assign table "
 750                 "Reconfigure Interrupt to Port Assignemt\n", irq);
 751                 return -ENODEV;
 752         }
 753
 754         if (__test_and_set_bit(gpionr, gpio_enabled))
 755                 bfin_gpio_irq_prepare(gpionr);
 756
 757         bfin_gpio_unmask_irq(irq);
 758
 759         return 0;
 760 }
 761
 762 static void bfin_gpio_irq_shutdown(unsigned int irq)
 763 {
 764         u32 gpionr = irq_to_gpio(irq);
 765
 766         bfin_gpio_mask_irq(irq);
 767         __clear_bit(gpionr, gpio_enabled);
 768         bfin_gpio_irq_free(gpionr);
 769 }
 770
 771 static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 772 {
 773         int ret;
 774         char buf[16];
 775         u32 gpionr = irq_to_gpio(irq);
 776         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 777         u32 pintbit = PINT_BIT(pint_val);
 778         u32 bank = PINT_2_BANK(pint_val);
 779
 780         if (pint_val == IRQ_NOT_AVAIL)
 781                 return -ENODEV;
 782
 783         if (type == IRQ_TYPE_PROBE) {
 784                 /* only probe unenabled GPIO interrupt lines */
 785                 if (__test_bit(gpionr, gpio_enabled))
 786                         return 0;
 787                 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 788         }
 789
 790         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
 791                     IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
 792
 793                 snprintf(buf, 16, "gpio-irq%d", irq);
 794                 ret = bfin_gpio_irq_request(gpionr, buf);
 795                 if (ret)
 796                         return ret;
 797
 798                 if (__test_and_set_bit(gpionr, gpio_enabled))
 799                         bfin_gpio_irq_prepare(gpionr);
 800
 801         } else {
 802                 __clear_bit(gpionr, gpio_enabled);
 803                 return 0;
 804         }
 805
 806         if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
 807                 pint[bank]->invert_set = pintbit;       /* low or falling edge denoted by one */
 808         else
 809                 pint[bank]->invert_clear = pintbit;     /* high or rising edge denoted by zero */
 810
 811         if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 812             == (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
 813                 if (gpio_get_value(gpionr))
 814                         pint[bank]->invert_set = pintbit;
 815                 else
 816                         pint[bank]->invert_clear = pintbit;
 817         }
 818
 819         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
 820                 pint[bank]->edge_set = pintbit;
 821                 bfin_set_irq_handler(irq, handle_edge_irq);
 822         } else {
 823                 pint[bank]->edge_clear = pintbit;
 824                 bfin_set_irq_handler(irq, handle_level_irq);
 825         }
 826
 827         return 0;
 828 }
 829
 830 #ifdef CONFIG_PM
 831 u32 pint_saved_masks[NR_PINT_SYS_IRQS];
 832 u32 pint_wakeup_masks[NR_PINT_SYS_IRQS];
 833
 834 int bfin_gpio_set_wake(unsigned int irq, unsigned int state)
 835 {
 836         u32 pint_irq;
 837         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 838         u32 bank = PINT_2_BANK(pint_val);
 839         u32 pintbit = PINT_BIT(pint_val);
 840
 841         switch (bank) {
 842         case 0:
 843                 pint_irq = IRQ_PINT0;
 844                 break;
 845         case 2:
 846                 pint_irq = IRQ_PINT2;
 847                 break;
 848         case 3:
 849                 pint_irq = IRQ_PINT3;
 850                 break;
 851         case 1:
 852                 pint_irq = IRQ_PINT1;
 853                 break;
 854         default:
 855                 return -EINVAL;
 856         }
 857
 858         bfin_internal_set_wake(pint_irq, state);
 859
 860         if (state)
 861                 pint_wakeup_masks[bank] |= pintbit;
 862         else
 863                 pint_wakeup_masks[bank] &= ~pintbit;
 864
 865         return 0;
 866 }
 867
 868 u32 bfin_pm_setup(void)
 869 {
 870         u32 val, i;
 871
 872         for (i = 0; i < NR_PINT_SYS_IRQS; i++) {
 873                 val = pint[i]->mask_clear;
 874                 pint_saved_masks[i] = val;
 875                 if (val ^ pint_wakeup_masks[i]) {
 876                         pint[i]->mask_clear = val;
 877                         pint[i]->mask_set = pint_wakeup_masks[i];
 878                 }
 879         }
 880
 881         return 0;
 882 }
 883
 884 void bfin_pm_restore(void)
 885 {
 886         u32 i, val;
 887
 888         for (i = 0; i < NR_PINT_SYS_IRQS; i++) {
 889                 val = pint_saved_masks[i];
 890                 if (val ^ pint_wakeup_masks[i]) {
 891                         pint[i]->mask_clear = pint[i]->mask_clear;
 892                         pint[i]->mask_set = val;
 893                 }
 894         }
 895 }
 896 #endif
 897
 898 static void bfin_demux_gpio_irq(unsigned int inta_irq,
 899                                 struct irq_desc *desc)
 900 {
 901         u32 bank, pint_val;
 902         u32 request, irq;
 903
 904         switch (inta_irq) {
 905         case IRQ_PINT0:
 906                 bank = 0;
 907                 break;
 908         case IRQ_PINT2:
 909                 bank = 2;
 910                 break;
 911         case IRQ_PINT3:
 912                 bank = 3;
 913                 break;
 914         case IRQ_PINT1:
 915                 bank = 1;
 916                 break;
 917         default:
 918                 return;
 919         }
 920
 921         pint_val = bank * NR_PINT_BITS;
 922
 923         request = pint[bank]->request;
 924
 925         while (request) {
 926                 if (request & 1) {
 927                         irq = pint2irq_lut[pint_val] + SYS_IRQS;
 928                         bfin_handle_irq(irq);
 929                 }
 930                 pint_val++;
 931                 request >>= 1;
 932         }
 933
 934 }
 935 #endif
 936
 937 static struct irq_chip bfin_gpio_irqchip = {
 938         .name = "GPIO",
 939         .ack = bfin_gpio_ack_irq,
 940         .mask = bfin_gpio_mask_irq,
 941         .mask_ack = bfin_gpio_mask_ack_irq,
 942         .unmask = bfin_gpio_unmask_irq,
 943         .disable = bfin_gpio_mask_irq,
 944         .enable = bfin_gpio_unmask_irq,
 945         .set_type = bfin_gpio_irq_type,
 946         .startup = bfin_gpio_irq_startup,
 947         .shutdown = bfin_gpio_irq_shutdown,
 948 #ifdef CONFIG_PM
 949         .set_wake = bfin_gpio_set_wake,
 950 #endif
 951 };
 952
 953 void __cpuinit init_exception_vectors(void)
 954 {
 955         /* cannot program in software:
 956          * evt0 - emulation (jtag)
 957          * evt1 - reset
 958          */
 959         bfin_write_EVT2(evt_nmi);
 960         bfin_write_EVT3(trap);
 961         bfin_write_EVT5(evt_ivhw);
 962         bfin_write_EVT6(evt_timer);
 963         bfin_write_EVT7(evt_evt7);
 964         bfin_write_EVT8(evt_evt8);
 965         bfin_write_EVT9(evt_evt9);
 966         bfin_write_EVT10(evt_evt10);
 967         bfin_write_EVT11(evt_evt11);
 968         bfin_write_EVT12(evt_evt12);
 969         bfin_write_EVT13(evt_evt13);
 970         bfin_write_EVT14(evt14_softirq);
 971         bfin_write_EVT15(evt_system_call);
 972         CSYNC();
 973 }
 974
 975 /*
 976  * This function should be called during kernel startup to initialize
 977  * the BFin IRQ handling routines.
 978  */
 979
 980 int __init init_arch_irq(void)
 981 {
 982         int irq;
 983         unsigned long ilat = 0;
 984         /*  Disable all the peripheral intrs  - page 4-29 HW Ref manual */
 985 #if defined(CONFIG_BF54x) || defined(CONFIG_BF52x) || defined(CONFIG_BF561) \
 986         || defined(BF538_FAMILY) || defined(CONFIG_BF51x)
 987         bfin_write_SIC_IMASK0(SIC_UNMASK_ALL);
 988         bfin_write_SIC_IMASK1(SIC_UNMASK_ALL);
 989 # ifdef CONFIG_BF54x
 990         bfin_write_SIC_IMASK2(SIC_UNMASK_ALL);
 991 # endif
 992 # ifdef CONFIG_SMP
 993         bfin_write_SICB_IMASK0(SIC_UNMASK_ALL);
 994         bfin_write_SICB_IMASK1(SIC_UNMASK_ALL);
 995 # endif
 996 #else
 997         bfin_write_SIC_IMASK(SIC_UNMASK_ALL);
 998 #endif
 999
1000         local_irq_disable();
1001
1002 #if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
1003         /* Clear EMAC Interrupt Status bits so we can demux it later */
1004         bfin_write_EMAC_SYSTAT(-1);
1005 #endif
1006
1007 #ifdef CONFIG_BF54x
1008 # ifdef CONFIG_PINTx_REASSIGN
1009         pint[0]->assign = CONFIG_PINT0_ASSIGN;
1010         pint[1]->assign = CONFIG_PINT1_ASSIGN;
1011         pint[2]->assign = CONFIG_PINT2_ASSIGN;
1012         pint[3]->assign = CONFIG_PINT3_ASSIGN;
1013 # endif
1014         /* Whenever PINTx_ASSIGN is altered init_pint_lut() must be executed! */
1015         init_pint_lut();
1016 #endif
1017
1018         for (irq = 0; irq <= SYS_IRQS; irq++) {
1019                 if (irq <= IRQ_CORETMR)
1020                         set_irq_chip(irq, &bfin_core_irqchip);
1021                 else
1022                         set_irq_chip(irq, &bfin_internal_irqchip);
1023
1024                 switch (irq) {
1025 #if defined(CONFIG_BF53x)
1026                 case IRQ_PROG_INTA:
1027 # if defined(BF537_FAMILY) && !(defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
1028                 case IRQ_MAC_RX:
1029 # endif
1030 #elif defined(CONFIG_BF54x)
1031                 case IRQ_PINT0:
1032                 case IRQ_PINT1:
1033                 case IRQ_PINT2:
1034                 case IRQ_PINT3:
1035 #elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
1036                 case IRQ_PORTF_INTA:
1037                 case IRQ_PORTG_INTA:
1038                 case IRQ_PORTH_INTA:
1039 #elif defined(CONFIG_BF561)
1040                 case IRQ_PROG0_INTA:
1041                 case IRQ_PROG1_INTA:
1042                 case IRQ_PROG2_INTA:
1043 #elif defined(CONFIG_BF538) || defined(CONFIG_BF539)
1044                 case IRQ_PORTF_INTA:
1045 #endif
1046
1047                         set_irq_chained_handler(irq,
1048                                                 bfin_demux_gpio_irq);
1049                         break;
1050 #ifdef BF537_GENERIC_ERROR_INT_DEMUX
1051                 case IRQ_GENERIC_ERROR:
1052                         set_irq_chained_handler(irq, bfin_demux_error_irq);
1053                         break;
1054 #endif
1055 #if defined(CONFIG_TICK_SOURCE_SYSTMR0) || defined(CONFIG_IPIPE)
1056                 case IRQ_TIMER0:
1057                         set_irq_handler(irq, handle_percpu_irq);
1058                         break;
1059 #endif
1060 #ifdef CONFIG_SMP
1061                 case IRQ_SUPPLE_0:
1062                 case IRQ_SUPPLE_1:
1063                         set_irq_handler(irq, handle_percpu_irq);
1064                         break;
1065 #endif
1066                 default:
1067 #ifdef CONFIG_IPIPE
1068                         /*
1069                          * We want internal interrupt sources to be
1070                          * masked, because ISRs may trigger interrupts
1071                          * recursively (e.g. DMA), but interrupts are
1072                          * _not_ masked at CPU level. So let's handle
1073                          * most of them as level interrupts, except
1074                          * the timer interrupt which is special.
1075                          */
1076                         if (irq == IRQ_SYSTMR || irq == IRQ_CORETMR)
1077                                 set_irq_handler(irq, handle_simple_irq);
1078                         else
1079                                 set_irq_handler(irq, handle_level_irq);
1080 #else /* !CONFIG_IPIPE */
1081                         set_irq_handler(irq, handle_simple_irq);
1082 #endif /* !CONFIG_IPIPE */
1083                         break;
1084                 }
1085         }
1086
1087 #ifdef BF537_GENERIC_ERROR_INT_DEMUX
1088         for (irq = IRQ_PPI_ERROR; irq <= IRQ_UART1_ERROR; irq++)
1089                 set_irq_chip_and_handler(irq, &bfin_generic_error_irqchip,
1090                                          handle_level_irq);
1091 #endif
1092
1093         /* if configured as edge, then will be changed to do_edge_IRQ */
1094         for (irq = GPIO_IRQ_BASE; irq < NR_IRQS; irq++)
1095                 set_irq_chip_and_handler(irq, &bfin_gpio_irqchip,
1096                                          handle_level_irq);
1097
1098
1099         bfin_write_IMASK(0);
1100         CSYNC();
1101         ilat = bfin_read_ILAT();
1102         CSYNC();
1103         bfin_write_ILAT(ilat);
1104         CSYNC();
1105
1106         printk(KERN_INFO "Configuring Blackfin Priority Driven Interrupts\n");
1107         /* IMASK=xxx is equivalent to STI xx or bfin_irq_flags=xx,
1108          * local_irq_enable()
1109          */
1110         program_IAR();
1111         /* Therefore it's better to setup IARs before interrupts enabled */
1112         search_IAR();
1113
1114         /* Enable interrupts IVG7-15 */
1115         bfin_irq_flags |= IMASK_IVG15 |
1116             IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
1117             IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 | IMASK_IVGHW;
1118
1119 #ifdef SIC_IWR0
1120         bfin_write_SIC_IWR0(IWR_DISABLE_ALL);
1121 # ifdef SIC_IWR1
1122         /* BF52x/BF51x system reset does not properly reset SIC_IWR1 which
1123          * will screw up the bootrom as it relies on MDMA0/1 waking it
1124          * up from IDLE instructions.  See this report for more info:
1125          * http://blackfin.uclinux.org/gf/tracker/4323
1126          */
1127         if (ANOMALY_05000435)
1128                 bfin_write_SIC_IWR1(IWR_ENABLE(10) | IWR_ENABLE(11));
1129         else
1130                 bfin_write_SIC_IWR1(IWR_DISABLE_ALL);
1131 # endif
1132 # ifdef SIC_IWR2
1133         bfin_write_SIC_IWR2(IWR_DISABLE_ALL);
1134 # endif
1135 #else
1136         bfin_write_SIC_IWR(IWR_DISABLE_ALL);
1137 #endif
1138
1139 #ifdef CONFIG_IPIPE
1140         for (irq = 0; irq < NR_IRQS; irq++) {
1141                 struct irq_desc *desc = irq_to_desc(irq);
1142                 desc->ic_prio = __ipipe_get_irq_priority(irq);
1143         }
1144 #endif /* CONFIG_IPIPE */
1145
1146         return 0;
1147 }
1148
1149 #ifdef CONFIG_DO_IRQ_L1
1150 __attribute__((l1_text))
1151 #endif
1152 void do_irq(int vec, struct pt_regs *fp)
1153 {
1154         if (vec == EVT_IVTMR_P) {
1155                 vec = IRQ_CORETMR;
1156         } else {
1157                 struct ivgx *ivg = ivg7_13[vec - IVG7].ifirst;
1158                 struct ivgx *ivg_stop = ivg7_13[vec - IVG7].istop;
1159 #if defined(CONFIG_BF54x) || defined(CONFIG_BF52x) || defined(CONFIG_BF561) \
1160         || defined(BF538_FAMILY) || defined(CONFIG_BF51x)
1161                 unsigned long sic_status[3];
1162
1163                 if (smp_processor_id()) {
1164 #ifdef CONFIG_SMP
1165                         /* This will be optimized out in UP mode. */
1166                         sic_status[0] = bfin_read_SICB_ISR0() & bfin_read_SICB_IMASK0();
1167                         sic_status[1] = bfin_read_SICB_ISR1() & bfin_read_SICB_IMASK1();
1168 #endif
1169                 } else {
1170                         sic_status[0] = bfin_read_SIC_ISR0() & bfin_read_SIC_IMASK0();
1171                         sic_status[1] = bfin_read_SIC_ISR1() & bfin_read_SIC_IMASK1();
1172                 }
1173 #ifdef CONFIG_BF54x
1174                 sic_status[2] = bfin_read_SIC_ISR2() & bfin_read_SIC_IMASK2();
1175 #endif
1176                 for (;; ivg++) {
1177                         if (ivg >= ivg_stop) {
1178                                 atomic_inc(&num_spurious);
1179                                 return;
1180                         }
1181                         if (sic_status[(ivg->irqno - IVG7) / 32] & ivg->isrflag)
1182                                 break;
1183                 }
1184 #else
1185                 unsigned long sic_status;
1186
1187                 sic_status = bfin_read_SIC_IMASK() & bfin_read_SIC_ISR();
1188
1189                 for (;; ivg++) {
1190                         if (ivg >= ivg_stop) {
1191                                 atomic_inc(&num_spurious);
1192                                 return;
1193                         } else if (sic_status & ivg->isrflag)
1194                                 break;
1195                 }
1196 #endif
1197                 vec = ivg->irqno;
1198         }
1199         asm_do_IRQ(vec, fp);
1200 }
1201
1202 #ifdef CONFIG_IPIPE
1203
1204 int __ipipe_get_irq_priority(unsigned irq)
1205 {
1206         int ient, prio;
1207
1208         if (irq <= IRQ_CORETMR)
1209                 return irq;
1210
1211         for (ient = 0; ient < NR_PERI_INTS; ient++) {
1212                 struct ivgx *ivg = ivg_table + ient;
1213                 if (ivg->irqno == irq) {
1214                         for (prio = 0; prio <= IVG13-IVG7; prio++) {
1215                                 if (ivg7_13[prio].ifirst <= ivg &&
1216                                     ivg7_13[prio].istop > ivg)
1217                                         return IVG7 + prio;
1218                         }
1219                 }
1220         }
1221
1222         return IVG15;
1223 }
1224
1225 /* Hw interrupts are disabled on entry (check SAVE_CONTEXT). */
1226 #ifdef CONFIG_DO_IRQ_L1
1227 __attribute__((l1_text))
1228 #endif
1229 asmlinkage int __ipipe_grab_irq(int vec, struct pt_regs *regs)
1230 {
1231         struct ipipe_percpu_domain_data *p = ipipe_root_cpudom_ptr();
1232         struct ipipe_domain *this_domain = ipipe_current_domain;
1233         struct ivgx *ivg_stop = ivg7_13[vec-IVG7].istop;
1234         struct ivgx *ivg = ivg7_13[vec-IVG7].ifirst;
1235         int irq, s;
1236
1237         if (likely(vec == EVT_IVTMR_P)) {
1238                 irq = IRQ_CORETMR;
1239                 goto core_tick;
1240         }
1241
1242         SSYNC();
1243
1244 #if defined(CONFIG_BF54x) || defined(CONFIG_BF52x) || defined(CONFIG_BF561)
1245         {
1246                 unsigned long sic_status[3];
1247
1248                 sic_status[0] = bfin_read_SIC_ISR0() & bfin_read_SIC_IMASK0();
1249                 sic_status[1] = bfin_read_SIC_ISR1() & bfin_read_SIC_IMASK1();
1250 #ifdef CONFIG_BF54x
1251                 sic_status[2] = bfin_read_SIC_ISR2() & bfin_read_SIC_IMASK2();
1252 #endif
1253                 for (;; ivg++) {
1254                         if (ivg >= ivg_stop) {
1255                                 atomic_inc(&num_spurious);
1256                                 return 0;
1257                         }
1258                         if (sic_status[(ivg->irqno - IVG7) / 32] & ivg->isrflag)
1259                                 break;
1260                 }
1261         }
1262 #else
1263         {
1264                 unsigned long sic_status;
1265
1266                 sic_status = bfin_read_SIC_IMASK() & bfin_read_SIC_ISR();
1267
1268                 for (;; ivg++) {
1269                         if (ivg >= ivg_stop) {
1270                                 atomic_inc(&num_spurious);
1271                                 return 0;
1272                         } else if (sic_status & ivg->isrflag)
1273                                 break;
1274                 }
1275         }
1276 #endif
1277
1278         irq = ivg->irqno;
1279
1280         if (irq == IRQ_SYSTMR) {
1281 #ifdef CONFIG_GENERIC_CLOCKEVENTS
1282 core_tick:
1283 #else
1284                 bfin_write_TIMER_STATUS(1); /* Latch TIMIL0 */
1285 #endif
1286                 /* This is basically what we need from the register frame. */
1287                 __raw_get_cpu_var(__ipipe_tick_regs).ipend = regs->ipend;
1288                 __raw_get_cpu_var(__ipipe_tick_regs).pc = regs->pc;
1289                 if (this_domain != ipipe_root_domain)
1290                         __raw_get_cpu_var(__ipipe_tick_regs).ipend &= ~0x10;
1291                 else
1292                         __raw_get_cpu_var(__ipipe_tick_regs).ipend |= 0x10;
1293         }
1294
1295 #ifndef CONFIG_GENERIC_CLOCKEVENTS
1296 core_tick:
1297 #endif
1298         if (this_domain == ipipe_root_domain) {
1299                 s = __test_and_set_bit(IPIPE_SYNCDEFER_FLAG, &p->status);
1300                 barrier();
1301         }
1302
1303         ipipe_trace_irq_entry(irq);
1304         __ipipe_handle_irq(irq, regs);
1305         ipipe_trace_irq_exit(irq);
1306
1307         if (this_domain == ipipe_root_domain) {
1308                 set_thread_flag(TIF_IRQ_SYNC);
1309                 if (!s) {
1310                         __clear_bit(IPIPE_SYNCDEFER_FLAG, &p->status);
1311                         return !test_bit(IPIPE_STALL_FLAG, &p->status);
1312                 }
1313         }
1314
1315        return 0;
1316 }
1317
1318 #endif /* CONFIG_IPIPE */