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 #ifdef CONFIG_BF53x
 165         bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() &
 166                              ~(1 << SIC_SYSIRQ(irq)));
 167 #else
 168         unsigned mask_bank, mask_bit;
 169         mask_bank = SIC_SYSIRQ(irq) / 32;
 170         mask_bit = SIC_SYSIRQ(irq) % 32;
 171         bfin_write_SIC_IMASK(mask_bank, bfin_read_SIC_IMASK(mask_bank) &
 172                              ~(1 << mask_bit));
 173 #ifdef CONFIG_SMP
 174         bfin_write_SICB_IMASK(mask_bank, bfin_read_SICB_IMASK(mask_bank) &
 175                              ~(1 << mask_bit));
 176 #endif
 177 #endif
 178 }
 179
 180 static void bfin_internal_unmask_irq(unsigned int irq)
 181 {
 182 #ifdef CONFIG_BF53x
 183         bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() |
 184                              (1 << SIC_SYSIRQ(irq)));
 185 #else
 186         unsigned mask_bank, mask_bit;
 187         mask_bank = SIC_SYSIRQ(irq) / 32;
 188         mask_bit = SIC_SYSIRQ(irq) % 32;
 189         bfin_write_SIC_IMASK(mask_bank, bfin_read_SIC_IMASK(mask_bank) |
 190                              (1 << mask_bit));
 191 #ifdef CONFIG_SMP
 192         bfin_write_SICB_IMASK(mask_bank, bfin_read_SICB_IMASK(mask_bank) |
 193                              (1 << mask_bit));
 194 #endif
 195 #endif
 196 }
 197
 198 #ifdef CONFIG_PM
 199 int bfin_internal_set_wake(unsigned int irq, unsigned int state)
 200 {
 201         u32 bank, bit, wakeup = 0;
 202         unsigned long flags;
 203         bank = SIC_SYSIRQ(irq) / 32;
 204         bit = SIC_SYSIRQ(irq) % 32;
 205
 206         switch (irq) {
 207 #ifdef IRQ_RTC
 208         case IRQ_RTC:
 209         wakeup |= WAKE;
 210         break;
 211 #endif
 212 #ifdef IRQ_CAN0_RX
 213         case IRQ_CAN0_RX:
 214         wakeup |= CANWE;
 215         break;
 216 #endif
 217 #ifdef IRQ_CAN1_RX
 218         case IRQ_CAN1_RX:
 219         wakeup |= CANWE;
 220         break;
 221 #endif
 222 #ifdef IRQ_USB_INT0
 223         case IRQ_USB_INT0:
 224         wakeup |= USBWE;
 225         break;
 226 #endif
 227 #ifdef IRQ_KEY
 228         case IRQ_KEY:
 229         wakeup |= KPADWE;
 230         break;
 231 #endif
 232 #ifdef CONFIG_BF54x
 233         case IRQ_CNT:
 234         wakeup |= ROTWE;
 235         break;
 236 #endif
 237         default:
 238         break;
 239         }
 240
 241         local_irq_save_hw(flags);
 242
 243         if (state) {
 244                 bfin_sic_iwr[bank] |= (1 << bit);
 245                 vr_wakeup  |= wakeup;
 246
 247         } else {
 248                 bfin_sic_iwr[bank] &= ~(1 << bit);
 249                 vr_wakeup  &= ~wakeup;
 250         }
 251
 252         local_irq_restore_hw(flags);
 253
 254         return 0;
 255 }
 256 #endif
 257
 258 static struct irq_chip bfin_core_irqchip = {
 259         .name = "CORE",
 260         .ack = bfin_ack_noop,
 261         .mask = bfin_core_mask_irq,
 262         .unmask = bfin_core_unmask_irq,
 263 };
 264
 265 static struct irq_chip bfin_internal_irqchip = {
 266         .name = "INTN",
 267         .ack = bfin_ack_noop,
 268         .mask = bfin_internal_mask_irq,
 269         .unmask = bfin_internal_unmask_irq,
 270         .mask_ack = bfin_internal_mask_irq,
 271         .disable = bfin_internal_mask_irq,
 272         .enable = bfin_internal_unmask_irq,
 273 #ifdef CONFIG_PM
 274         .set_wake = bfin_internal_set_wake,
 275 #endif
 276 };
 277
 278 static void bfin_handle_irq(unsigned irq)
 279 {
 280 #ifdef CONFIG_IPIPE
 281         struct pt_regs regs;    /* Contents not used. */
 282         ipipe_trace_irq_entry(irq);
 283         __ipipe_handle_irq(irq, &regs);
 284         ipipe_trace_irq_exit(irq);
 285 #else /* !CONFIG_IPIPE */
 286         struct irq_desc *desc = irq_desc + irq;
 287         desc->handle_irq(irq, desc);
 288 #endif  /* !CONFIG_IPIPE */
 289 }
 290
 291 #ifdef BF537_GENERIC_ERROR_INT_DEMUX
 292 static int error_int_mask;
 293
 294 static void bfin_generic_error_mask_irq(unsigned int irq)
 295 {
 296         error_int_mask &= ~(1L << (irq - IRQ_PPI_ERROR));
 297
 298         if (!error_int_mask)
 299                 bfin_internal_mask_irq(IRQ_GENERIC_ERROR);
 300 }
 301
 302 static void bfin_generic_error_unmask_irq(unsigned int irq)
 303 {
 304         bfin_internal_unmask_irq(IRQ_GENERIC_ERROR);
 305         error_int_mask |= 1L << (irq - IRQ_PPI_ERROR);
 306 }
 307
 308 static struct irq_chip bfin_generic_error_irqchip = {
 309         .name = "ERROR",
 310         .ack = bfin_ack_noop,
 311         .mask_ack = bfin_generic_error_mask_irq,
 312         .mask = bfin_generic_error_mask_irq,
 313         .unmask = bfin_generic_error_unmask_irq,
 314 };
 315
 316 static void bfin_demux_error_irq(unsigned int int_err_irq,
 317                                  struct irq_desc *inta_desc)
 318 {
 319         int irq = 0;
 320
 321 #if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
 322         if (bfin_read_EMAC_SYSTAT() & EMAC_ERR_MASK)
 323                 irq = IRQ_MAC_ERROR;
 324         else
 325 #endif
 326         if (bfin_read_SPORT0_STAT() & SPORT_ERR_MASK)
 327                 irq = IRQ_SPORT0_ERROR;
 328         else if (bfin_read_SPORT1_STAT() & SPORT_ERR_MASK)
 329                 irq = IRQ_SPORT1_ERROR;
 330         else if (bfin_read_PPI_STATUS() & PPI_ERR_MASK)
 331                 irq = IRQ_PPI_ERROR;
 332         else if (bfin_read_CAN_GIF() & CAN_ERR_MASK)
 333                 irq = IRQ_CAN_ERROR;
 334         else if (bfin_read_SPI_STAT() & SPI_ERR_MASK)
 335                 irq = IRQ_SPI_ERROR;
 336         else if ((bfin_read_UART0_IIR() & UART_ERR_MASK_STAT1) &&
 337                  (bfin_read_UART0_IIR() & UART_ERR_MASK_STAT0))
 338                 irq = IRQ_UART0_ERROR;
 339         else if ((bfin_read_UART1_IIR() & UART_ERR_MASK_STAT1) &&
 340                  (bfin_read_UART1_IIR() & UART_ERR_MASK_STAT0))
 341                 irq = IRQ_UART1_ERROR;
 342
 343         if (irq) {
 344                 if (error_int_mask & (1L << (irq - IRQ_PPI_ERROR)))
 345                         bfin_handle_irq(irq);
 346                 else {
 347
 348                         switch (irq) {
 349                         case IRQ_PPI_ERROR:
 350                                 bfin_write_PPI_STATUS(PPI_ERR_MASK);
 351                                 break;
 352 #if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
 353                         case IRQ_MAC_ERROR:
 354                                 bfin_write_EMAC_SYSTAT(EMAC_ERR_MASK);
 355                                 break;
 356 #endif
 357                         case IRQ_SPORT0_ERROR:
 358                                 bfin_write_SPORT0_STAT(SPORT_ERR_MASK);
 359                                 break;
 360
 361                         case IRQ_SPORT1_ERROR:
 362                                 bfin_write_SPORT1_STAT(SPORT_ERR_MASK);
 363                                 break;
 364
 365                         case IRQ_CAN_ERROR:
 366                                 bfin_write_CAN_GIS(CAN_ERR_MASK);
 367                                 break;
 368
 369                         case IRQ_SPI_ERROR:
 370                                 bfin_write_SPI_STAT(SPI_ERR_MASK);
 371                                 break;
 372
 373                         default:
 374                                 break;
 375                         }
 376
 377                         pr_debug("IRQ %d:"
 378                                  " MASKED PERIPHERAL ERROR INTERRUPT ASSERTED\n",
 379                                  irq);
 380                 }
 381         } else
 382                 printk(KERN_ERR
 383                        "%s : %s : LINE %d :\nIRQ ?: PERIPHERAL ERROR"
 384                        " INTERRUPT ASSERTED BUT NO SOURCE FOUND\n",
 385                        __func__, __FILE__, __LINE__);
 386
 387 }
 388 #endif                          /* BF537_GENERIC_ERROR_INT_DEMUX */
 389
 390 static inline void bfin_set_irq_handler(unsigned irq, irq_flow_handler_t handle)
 391 {
 392 #ifdef CONFIG_IPIPE
 393         _set_irq_handler(irq, handle_edge_irq);
 394 #else
 395         struct irq_desc *desc = irq_desc + irq;
 396         /* May not call generic set_irq_handler() due to spinlock
 397            recursion. */
 398         desc->handle_irq = handle;
 399 #endif
 400 }
 401
 402 static DECLARE_BITMAP(gpio_enabled, MAX_BLACKFIN_GPIOS);
 403 extern void bfin_gpio_irq_prepare(unsigned gpio);
 404
 405 #if !defined(CONFIG_BF54x)
 406
 407 static void bfin_gpio_ack_irq(unsigned int irq)
 408 {
 409         /* AFAIK ack_irq in case mask_ack is provided
 410          * get's only called for edge sense irqs
 411          */
 412         set_gpio_data(irq_to_gpio(irq), 0);
 413 }
 414
 415 static void bfin_gpio_mask_ack_irq(unsigned int irq)
 416 {
 417         struct irq_desc *desc = irq_desc + irq;
 418         u32 gpionr = irq_to_gpio(irq);
 419
 420         if (desc->handle_irq == handle_edge_irq)
 421                 set_gpio_data(gpionr, 0);
 422
 423         set_gpio_maska(gpionr, 0);
 424 }
 425
 426 static void bfin_gpio_mask_irq(unsigned int irq)
 427 {
 428         set_gpio_maska(irq_to_gpio(irq), 0);
 429 }
 430
 431 static void bfin_gpio_unmask_irq(unsigned int irq)
 432 {
 433         set_gpio_maska(irq_to_gpio(irq), 1);
 434 }
 435
 436 static unsigned int bfin_gpio_irq_startup(unsigned int irq)
 437 {
 438         u32 gpionr = irq_to_gpio(irq);
 439
 440         if (__test_and_set_bit(gpionr, gpio_enabled))
 441                 bfin_gpio_irq_prepare(gpionr);
 442
 443         bfin_gpio_unmask_irq(irq);
 444
 445         return 0;
 446 }
 447
 448 static void bfin_gpio_irq_shutdown(unsigned int irq)
 449 {
 450         u32 gpionr = irq_to_gpio(irq);
 451
 452         bfin_gpio_mask_irq(irq);
 453         __clear_bit(gpionr, gpio_enabled);
 454         bfin_gpio_irq_free(gpionr);
 455 }
 456
 457 static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 458 {
 459         int ret;
 460         char buf[16];
 461         u32 gpionr = irq_to_gpio(irq);
 462
 463         if (type == IRQ_TYPE_PROBE) {
 464                 /* only probe unenabled GPIO interrupt lines */
 465                 if (__test_bit(gpionr, gpio_enabled))
 466                         return 0;
 467                 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 468         }
 469
 470         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
 471                     IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
 472
 473                 snprintf(buf, 16, "gpio-irq%d", irq);
 474                 ret = bfin_gpio_irq_request(gpionr, buf);
 475                 if (ret)
 476                         return ret;
 477
 478                 if (__test_and_set_bit(gpionr, gpio_enabled))
 479                         bfin_gpio_irq_prepare(gpionr);
 480
 481         } else {
 482                 __clear_bit(gpionr, gpio_enabled);
 483                 return 0;
 484         }
 485
 486         set_gpio_inen(gpionr, 0);
 487         set_gpio_dir(gpionr, 0);
 488
 489         if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 490             == (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 491                 set_gpio_both(gpionr, 1);
 492         else
 493                 set_gpio_both(gpionr, 0);
 494
 495         if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
 496                 set_gpio_polar(gpionr, 1);      /* low or falling edge denoted by one */
 497         else
 498                 set_gpio_polar(gpionr, 0);      /* high or rising edge denoted by zero */
 499
 500         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
 501                 set_gpio_edge(gpionr, 1);
 502                 set_gpio_inen(gpionr, 1);
 503                 set_gpio_data(gpionr, 0);
 504
 505         } else {
 506                 set_gpio_edge(gpionr, 0);
 507                 set_gpio_inen(gpionr, 1);
 508         }
 509
 510         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 511                 bfin_set_irq_handler(irq, handle_edge_irq);
 512         else
 513                 bfin_set_irq_handler(irq, handle_level_irq);
 514
 515         return 0;
 516 }
 517
 518 #ifdef CONFIG_PM
 519 int bfin_gpio_set_wake(unsigned int irq, unsigned int state)
 520 {
 521         unsigned gpio = irq_to_gpio(irq);
 522
 523         if (state)
 524                 gpio_pm_wakeup_request(gpio, PM_WAKE_IGNORE);
 525         else
 526                 gpio_pm_wakeup_free(gpio);
 527
 528         return 0;
 529 }
 530 #endif
 531
 532 static void bfin_demux_gpio_irq(unsigned int inta_irq,
 533                                 struct irq_desc *desc)
 534 {
 535         unsigned int i, gpio, mask, irq, search = 0;
 536
 537         switch (inta_irq) {
 538 #if defined(CONFIG_BF53x)
 539         case IRQ_PROG_INTA:
 540                 irq = IRQ_PF0;
 541                 search = 1;
 542                 break;
 543 # if defined(BF537_FAMILY) && !(defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
 544         case IRQ_MAC_RX:
 545                 irq = IRQ_PH0;
 546                 break;
 547 # endif
 548 #elif defined(CONFIG_BF538) || defined(CONFIG_BF539)
 549         case IRQ_PORTF_INTA:
 550                 irq = IRQ_PF0;
 551                 break;
 552 #elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
 553         case IRQ_PORTF_INTA:
 554                 irq = IRQ_PF0;
 555                 break;
 556         case IRQ_PORTG_INTA:
 557                 irq = IRQ_PG0;
 558                 break;
 559         case IRQ_PORTH_INTA:
 560                 irq = IRQ_PH0;
 561                 break;
 562 #elif defined(CONFIG_BF561)
 563         case IRQ_PROG0_INTA:
 564                 irq = IRQ_PF0;
 565                 break;
 566         case IRQ_PROG1_INTA:
 567                 irq = IRQ_PF16;
 568                 break;
 569         case IRQ_PROG2_INTA:
 570                 irq = IRQ_PF32;
 571                 break;
 572 #endif
 573         default:
 574                 BUG();
 575                 return;
 576         }
 577
 578         if (search) {
 579                 for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
 580                         irq += i;
 581
 582                         mask = get_gpiop_data(i) & get_gpiop_maska(i);
 583
 584                         while (mask) {
 585                                 if (mask & 1)
 586                                         bfin_handle_irq(irq);
 587                                 irq++;
 588                                 mask >>= 1;
 589                         }
 590                 }
 591         } else {
 592                         gpio = irq_to_gpio(irq);
 593                         mask = get_gpiop_data(gpio) & get_gpiop_maska(gpio);
 594
 595                         do {
 596                                 if (mask & 1)
 597                                         bfin_handle_irq(irq);
 598                                 irq++;
 599                                 mask >>= 1;
 600                         } while (mask);
 601         }
 602
 603 }
 604
 605 #else                           /* CONFIG_BF54x */
 606
 607 #define NR_PINT_SYS_IRQS        4
 608 #define NR_PINT_BITS            32
 609 #define NR_PINTS                160
 610 #define IRQ_NOT_AVAIL           0xFF
 611
 612 #define PINT_2_BANK(x)          ((x) >> 5)
 613 #define PINT_2_BIT(x)           ((x) & 0x1F)
 614 #define PINT_BIT(x)             (1 << (PINT_2_BIT(x)))
 615
 616 static unsigned char irq2pint_lut[NR_PINTS];
 617 static unsigned char pint2irq_lut[NR_PINT_SYS_IRQS * NR_PINT_BITS];
 618
 619 struct pin_int_t {
 620         unsigned int mask_set;
 621         unsigned int mask_clear;
 622         unsigned int request;
 623         unsigned int assign;
 624         unsigned int edge_set;
 625         unsigned int edge_clear;
 626         unsigned int invert_set;
 627         unsigned int invert_clear;
 628         unsigned int pinstate;
 629         unsigned int latch;
 630 };
 631
 632 static struct pin_int_t *pint[NR_PINT_SYS_IRQS] = {
 633         (struct pin_int_t *)PINT0_MASK_SET,
 634         (struct pin_int_t *)PINT1_MASK_SET,
 635         (struct pin_int_t *)PINT2_MASK_SET,
 636         (struct pin_int_t *)PINT3_MASK_SET,
 637 };
 638
 639 inline unsigned int get_irq_base(u32 bank, u8 bmap)
 640 {
 641         unsigned int irq_base;
 642
 643         if (bank < 2) {         /*PA-PB */
 644                 irq_base = IRQ_PA0 + bmap * 16;
 645         } else {                /*PC-PJ */
 646                 irq_base = IRQ_PC0 + bmap * 16;
 647         }
 648
 649         return irq_base;
 650 }
 651
 652         /* Whenever PINTx_ASSIGN is altered init_pint_lut() must be executed! */
 653 void init_pint_lut(void)
 654 {
 655         u16 bank, bit, irq_base, bit_pos;
 656         u32 pint_assign;
 657         u8 bmap;
 658
 659         memset(irq2pint_lut, IRQ_NOT_AVAIL, sizeof(irq2pint_lut));
 660
 661         for (bank = 0; bank < NR_PINT_SYS_IRQS; bank++) {
 662
 663                 pint_assign = pint[bank]->assign;
 664
 665                 for (bit = 0; bit < NR_PINT_BITS; bit++) {
 666
 667                         bmap = (pint_assign >> ((bit / 8) * 8)) & 0xFF;
 668
 669                         irq_base = get_irq_base(bank, bmap);
 670
 671                         irq_base += (bit % 8) + ((bit / 8) & 1 ? 8 : 0);
 672                         bit_pos = bit + bank * NR_PINT_BITS;
 673
 674                         pint2irq_lut[bit_pos] = irq_base - SYS_IRQS;
 675                         irq2pint_lut[irq_base - SYS_IRQS] = bit_pos;
 676                 }
 677         }
 678 }
 679
 680 static void bfin_gpio_ack_irq(unsigned int irq)
 681 {
 682         struct irq_desc *desc = irq_desc + irq;
 683         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 684         u32 pintbit = PINT_BIT(pint_val);
 685         u32 bank = PINT_2_BANK(pint_val);
 686
 687         if ((desc->status & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_BOTH) {
 688                 if (pint[bank]->invert_set & pintbit)
 689                         pint[bank]->invert_clear = pintbit;
 690                 else
 691                         pint[bank]->invert_set = pintbit;
 692         }
 693         pint[bank]->request = pintbit;
 694
 695 }
 696
 697 static void bfin_gpio_mask_ack_irq(unsigned int irq)
 698 {
 699         struct irq_desc *desc = irq_desc + irq;
 700         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 701         u32 pintbit = PINT_BIT(pint_val);
 702         u32 bank = PINT_2_BANK(pint_val);
 703
 704         if ((desc->status & IRQ_TYPE_SENSE_MASK) == 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
 711         pint[bank]->request = pintbit;
 712         pint[bank]->mask_clear = pintbit;
 713 }
 714
 715 static void bfin_gpio_mask_irq(unsigned int irq)
 716 {
 717         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 718
 719         pint[PINT_2_BANK(pint_val)]->mask_clear = PINT_BIT(pint_val);
 720 }
 721
 722 static void bfin_gpio_unmask_irq(unsigned int irq)
 723 {
 724         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 725         u32 pintbit = PINT_BIT(pint_val);
 726         u32 bank = PINT_2_BANK(pint_val);
 727
 728         pint[bank]->request = pintbit;
 729         pint[bank]->mask_set = pintbit;
 730 }
 731
 732 static unsigned int bfin_gpio_irq_startup(unsigned int irq)
 733 {
 734         u32 gpionr = irq_to_gpio(irq);
 735         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 736
 737         if (pint_val == IRQ_NOT_AVAIL) {
 738                 printk(KERN_ERR
 739                 "GPIO IRQ %d :Not in PINT Assign table "
 740                 "Reconfigure Interrupt to Port Assignemt\n", irq);
 741                 return -ENODEV;
 742         }
 743
 744         if (__test_and_set_bit(gpionr, gpio_enabled))
 745                 bfin_gpio_irq_prepare(gpionr);
 746
 747         bfin_gpio_unmask_irq(irq);
 748
 749         return 0;
 750 }
 751
 752 static void bfin_gpio_irq_shutdown(unsigned int irq)
 753 {
 754         u32 gpionr = irq_to_gpio(irq);
 755
 756         bfin_gpio_mask_irq(irq);
 757         __clear_bit(gpionr, gpio_enabled);
 758         bfin_gpio_irq_free(gpionr);
 759 }
 760
 761 static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 762 {
 763         int ret;
 764         char buf[16];
 765         u32 gpionr = irq_to_gpio(irq);
 766         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 767         u32 pintbit = PINT_BIT(pint_val);
 768         u32 bank = PINT_2_BANK(pint_val);
 769
 770         if (pint_val == IRQ_NOT_AVAIL)
 771                 return -ENODEV;
 772
 773         if (type == IRQ_TYPE_PROBE) {
 774                 /* only probe unenabled GPIO interrupt lines */
 775                 if (__test_bit(gpionr, gpio_enabled))
 776                         return 0;
 777                 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 778         }
 779
 780         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
 781                     IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
 782
 783                 snprintf(buf, 16, "gpio-irq%d", irq);
 784                 ret = bfin_gpio_irq_request(gpionr, buf);
 785                 if (ret)
 786                         return ret;
 787
 788                 if (__test_and_set_bit(gpionr, gpio_enabled))
 789                         bfin_gpio_irq_prepare(gpionr);
 790
 791         } else {
 792                 __clear_bit(gpionr, gpio_enabled);
 793                 return 0;
 794         }
 795
 796         if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
 797                 pint[bank]->invert_set = pintbit;       /* low or falling edge denoted by one */
 798         else
 799                 pint[bank]->invert_clear = pintbit;     /* high or rising edge denoted by zero */
 800
 801         if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 802             == (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
 803                 if (gpio_get_value(gpionr))
 804                         pint[bank]->invert_set = pintbit;
 805                 else
 806                         pint[bank]->invert_clear = pintbit;
 807         }
 808
 809         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
 810                 pint[bank]->edge_set = pintbit;
 811                 bfin_set_irq_handler(irq, handle_edge_irq);
 812         } else {
 813                 pint[bank]->edge_clear = pintbit;
 814                 bfin_set_irq_handler(irq, handle_level_irq);
 815         }
 816
 817         return 0;
 818 }
 819
 820 #ifdef CONFIG_PM
 821 u32 pint_saved_masks[NR_PINT_SYS_IRQS];
 822 u32 pint_wakeup_masks[NR_PINT_SYS_IRQS];
 823
 824 int bfin_gpio_set_wake(unsigned int irq, unsigned int state)
 825 {
 826         u32 pint_irq;
 827         u32 pint_val = irq2pint_lut[irq - SYS_IRQS];
 828         u32 bank = PINT_2_BANK(pint_val);
 829         u32 pintbit = PINT_BIT(pint_val);
 830
 831         switch (bank) {
 832         case 0:
 833                 pint_irq = IRQ_PINT0;
 834                 break;
 835         case 2:
 836                 pint_irq = IRQ_PINT2;
 837                 break;
 838         case 3:
 839                 pint_irq = IRQ_PINT3;
 840                 break;
 841         case 1:
 842                 pint_irq = IRQ_PINT1;
 843                 break;
 844         default:
 845                 return -EINVAL;
 846         }
 847
 848         bfin_internal_set_wake(pint_irq, state);
 849
 850         if (state)
 851                 pint_wakeup_masks[bank] |= pintbit;
 852         else
 853                 pint_wakeup_masks[bank] &= ~pintbit;
 854
 855         return 0;
 856 }
 857
 858 u32 bfin_pm_setup(void)
 859 {
 860         u32 val, i;
 861
 862         for (i = 0; i < NR_PINT_SYS_IRQS; i++) {
 863                 val = pint[i]->mask_clear;
 864                 pint_saved_masks[i] = val;
 865                 if (val ^ pint_wakeup_masks[i]) {
 866                         pint[i]->mask_clear = val;
 867                         pint[i]->mask_set = pint_wakeup_masks[i];
 868                 }
 869         }
 870
 871         return 0;
 872 }
 873
 874 void bfin_pm_restore(void)
 875 {
 876         u32 i, val;
 877
 878         for (i = 0; i < NR_PINT_SYS_IRQS; i++) {
 879                 val = pint_saved_masks[i];
 880                 if (val ^ pint_wakeup_masks[i]) {
 881                         pint[i]->mask_clear = pint[i]->mask_clear;
 882                         pint[i]->mask_set = val;
 883                 }
 884         }
 885 }
 886 #endif
 887
 888 static void bfin_demux_gpio_irq(unsigned int inta_irq,
 889                                 struct irq_desc *desc)
 890 {
 891         u32 bank, pint_val;
 892         u32 request, irq;
 893
 894         switch (inta_irq) {
 895         case IRQ_PINT0:
 896                 bank = 0;
 897                 break;
 898         case IRQ_PINT2:
 899                 bank = 2;
 900                 break;
 901         case IRQ_PINT3:
 902                 bank = 3;
 903                 break;
 904         case IRQ_PINT1:
 905                 bank = 1;
 906                 break;
 907         default:
 908                 return;
 909         }
 910
 911         pint_val = bank * NR_PINT_BITS;
 912
 913         request = pint[bank]->request;
 914
 915         while (request) {
 916                 if (request & 1) {
 917                         irq = pint2irq_lut[pint_val] + SYS_IRQS;
 918                         bfin_handle_irq(irq);
 919                 }
 920                 pint_val++;
 921                 request >>= 1;
 922         }
 923
 924 }
 925 #endif
 926
 927 static struct irq_chip bfin_gpio_irqchip = {
 928         .name = "GPIO",
 929         .ack = bfin_gpio_ack_irq,
 930         .mask = bfin_gpio_mask_irq,
 931         .mask_ack = bfin_gpio_mask_ack_irq,
 932         .unmask = bfin_gpio_unmask_irq,
 933         .disable = bfin_gpio_mask_irq,
 934         .enable = bfin_gpio_unmask_irq,
 935         .set_type = bfin_gpio_irq_type,
 936         .startup = bfin_gpio_irq_startup,
 937         .shutdown = bfin_gpio_irq_shutdown,
 938 #ifdef CONFIG_PM
 939         .set_wake = bfin_gpio_set_wake,
 940 #endif
 941 };
 942
 943 void __cpuinit init_exception_vectors(void)
 944 {
 945         /* cannot program in software:
 946          * evt0 - emulation (jtag)
 947          * evt1 - reset
 948          */
 949         bfin_write_EVT2(evt_nmi);
 950         bfin_write_EVT3(trap);
 951         bfin_write_EVT5(evt_ivhw);
 952         bfin_write_EVT6(evt_timer);
 953         bfin_write_EVT7(evt_evt7);
 954         bfin_write_EVT8(evt_evt8);
 955         bfin_write_EVT9(evt_evt9);
 956         bfin_write_EVT10(evt_evt10);
 957         bfin_write_EVT11(evt_evt11);
 958         bfin_write_EVT12(evt_evt12);
 959         bfin_write_EVT13(evt_evt13);
 960         bfin_write_EVT14(evt14_softirq);
 961         bfin_write_EVT15(evt_system_call);
 962         CSYNC();
 963 }
 964
 965 /*
 966  * This function should be called during kernel startup to initialize
 967  * the BFin IRQ handling routines.
 968  */
 969
 970 int __init init_arch_irq(void)
 971 {
 972         int irq;
 973         unsigned long ilat = 0;
 974         /*  Disable all the peripheral intrs  - page 4-29 HW Ref manual */
 975 #if defined(CONFIG_BF54x) || defined(CONFIG_BF52x) || defined(CONFIG_BF561) \
 976         || defined(BF538_FAMILY) || defined(CONFIG_BF51x)
 977         bfin_write_SIC_IMASK0(SIC_UNMASK_ALL);
 978         bfin_write_SIC_IMASK1(SIC_UNMASK_ALL);
 979 # ifdef CONFIG_BF54x
 980         bfin_write_SIC_IMASK2(SIC_UNMASK_ALL);
 981 # endif
 982 # ifdef CONFIG_SMP
 983         bfin_write_SICB_IMASK0(SIC_UNMASK_ALL);
 984         bfin_write_SICB_IMASK1(SIC_UNMASK_ALL);
 985 # endif
 986 #else
 987         bfin_write_SIC_IMASK(SIC_UNMASK_ALL);
 988 #endif
 989
 990         local_irq_disable();
 991
 992 #if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
 993         /* Clear EMAC Interrupt Status bits so we can demux it later */
 994         bfin_write_EMAC_SYSTAT(-1);
 995 #endif
 996
 997 #ifdef CONFIG_BF54x
 998 # ifdef CONFIG_PINTx_REASSIGN
 999         pint[0]->assign = CONFIG_PINT0_ASSIGN;
1000         pint[1]->assign = CONFIG_PINT1_ASSIGN;
1001         pint[2]->assign = CONFIG_PINT2_ASSIGN;
1002         pint[3]->assign = CONFIG_PINT3_ASSIGN;
1003 # endif
1004         /* Whenever PINTx_ASSIGN is altered init_pint_lut() must be executed! */
1005         init_pint_lut();
1006 #endif
1007
1008         for (irq = 0; irq <= SYS_IRQS; irq++) {
1009                 if (irq <= IRQ_CORETMR)
1010                         set_irq_chip(irq, &bfin_core_irqchip);
1011                 else
1012                         set_irq_chip(irq, &bfin_internal_irqchip);
1013
1014                 switch (irq) {
1015 #if defined(CONFIG_BF53x)
1016                 case IRQ_PROG_INTA:
1017 # if defined(BF537_FAMILY) && !(defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
1018                 case IRQ_MAC_RX:
1019 # endif
1020 #elif defined(CONFIG_BF54x)
1021                 case IRQ_PINT0:
1022                 case IRQ_PINT1:
1023                 case IRQ_PINT2:
1024                 case IRQ_PINT3:
1025 #elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
1026                 case IRQ_PORTF_INTA:
1027                 case IRQ_PORTG_INTA:
1028                 case IRQ_PORTH_INTA:
1029 #elif defined(CONFIG_BF561)
1030                 case IRQ_PROG0_INTA:
1031                 case IRQ_PROG1_INTA:
1032                 case IRQ_PROG2_INTA:
1033 #elif defined(CONFIG_BF538) || defined(CONFIG_BF539)
1034                 case IRQ_PORTF_INTA:
1035 #endif
1036
1037                         set_irq_chained_handler(irq,
1038                                                 bfin_demux_gpio_irq);
1039                         break;
1040 #ifdef BF537_GENERIC_ERROR_INT_DEMUX
1041                 case IRQ_GENERIC_ERROR:
1042                         set_irq_chained_handler(irq, bfin_demux_error_irq);
1043                         break;
1044 #endif
1045 #if defined(CONFIG_TICK_SOURCE_SYSTMR0) || defined(CONFIG_IPIPE)
1046                 case IRQ_TIMER0:
1047                         set_irq_handler(irq, handle_percpu_irq);
1048                         break;
1049 #endif
1050 #ifdef CONFIG_SMP
1051                 case IRQ_SUPPLE_0:
1052                 case IRQ_SUPPLE_1:
1053                         set_irq_handler(irq, handle_percpu_irq);
1054                         break;
1055 #endif
1056                 default:
1057 #ifdef CONFIG_IPIPE
1058         /*
1059          * We want internal interrupt sources to be masked, because
1060          * ISRs may trigger interrupts recursively (e.g. DMA), but
1061          * interrupts are _not_ masked at CPU level. So let's handle
1062          * them as level interrupts.
1063          */
1064                         set_irq_handler(irq, handle_level_irq);
1065 #else /* !CONFIG_IPIPE */
1066                         set_irq_handler(irq, handle_simple_irq);
1067 #endif /* !CONFIG_IPIPE */
1068                         break;
1069                 }
1070         }
1071
1072 #ifdef BF537_GENERIC_ERROR_INT_DEMUX
1073         for (irq = IRQ_PPI_ERROR; irq <= IRQ_UART1_ERROR; irq++)
1074                 set_irq_chip_and_handler(irq, &bfin_generic_error_irqchip,
1075                                          handle_level_irq);
1076 #endif
1077
1078         /* if configured as edge, then will be changed to do_edge_IRQ */
1079         for (irq = GPIO_IRQ_BASE; irq < NR_IRQS; irq++)
1080                 set_irq_chip_and_handler(irq, &bfin_gpio_irqchip,
1081                                          handle_level_irq);
1082
1083
1084         bfin_write_IMASK(0);
1085         CSYNC();
1086         ilat = bfin_read_ILAT();
1087         CSYNC();
1088         bfin_write_ILAT(ilat);
1089         CSYNC();
1090
1091         printk(KERN_INFO "Configuring Blackfin Priority Driven Interrupts\n");
1092         /* IMASK=xxx is equivalent to STI xx or bfin_irq_flags=xx,
1093          * local_irq_enable()
1094          */
1095         program_IAR();
1096         /* Therefore it's better to setup IARs before interrupts enabled */
1097         search_IAR();
1098
1099         /* Enable interrupts IVG7-15 */
1100         bfin_irq_flags |= IMASK_IVG15 |
1101             IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
1102             IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 | IMASK_IVGHW;
1103
1104 #if defined(CONFIG_BF54x) || defined(CONFIG_BF52x) || defined(CONFIG_BF561) \
1105         || defined(BF538_FAMILY) || defined(CONFIG_BF51x)
1106         bfin_write_SIC_IWR0(IWR_DISABLE_ALL);
1107 #if defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
1108         /* BF52x/BF51x system reset does not properly reset SIC_IWR1 which
1109          * will screw up the bootrom as it relies on MDMA0/1 waking it
1110          * up from IDLE instructions.  See this report for more info:
1111          * http://blackfin.uclinux.org/gf/tracker/4323
1112          */
1113         if (ANOMALY_05000435)
1114                 bfin_write_SIC_IWR1(IWR_ENABLE(10) | IWR_ENABLE(11));
1115         else
1116                 bfin_write_SIC_IWR1(IWR_DISABLE_ALL);
1117 #else
1118         bfin_write_SIC_IWR1(IWR_DISABLE_ALL);
1119 #endif
1120 # ifdef CONFIG_BF54x
1121         bfin_write_SIC_IWR2(IWR_DISABLE_ALL);
1122 # endif
1123 #else
1124         bfin_write_SIC_IWR(IWR_DISABLE_ALL);
1125 #endif
1126
1127 #ifdef CONFIG_IPIPE
1128         for (irq = 0; irq < NR_IRQS; irq++) {
1129                 struct irq_desc *desc = irq_desc + irq;
1130                 desc->ic_prio = __ipipe_get_irq_priority(irq);
1131                 desc->thr_prio = __ipipe_get_irqthread_priority(irq);
1132         }
1133 #endif /* CONFIG_IPIPE */
1134
1135         return 0;
1136 }
1137
1138 #ifdef CONFIG_DO_IRQ_L1
1139 __attribute__((l1_text))
1140 #endif
1141 void do_irq(int vec, struct pt_regs *fp)
1142 {
1143         if (vec == EVT_IVTMR_P) {
1144                 vec = IRQ_CORETMR;
1145         } else {
1146                 struct ivgx *ivg = ivg7_13[vec - IVG7].ifirst;
1147                 struct ivgx *ivg_stop = ivg7_13[vec - IVG7].istop;
1148 #if defined(CONFIG_BF54x) || defined(CONFIG_BF52x) || defined(CONFIG_BF561) \
1149         || defined(BF538_FAMILY) || defined(CONFIG_BF51x)
1150                 unsigned long sic_status[3];
1151
1152                 if (smp_processor_id()) {
1153 #ifdef CONFIG_SMP
1154                         /* This will be optimized out in UP mode. */
1155                         sic_status[0] = bfin_read_SICB_ISR0() & bfin_read_SICB_IMASK0();
1156                         sic_status[1] = bfin_read_SICB_ISR1() & bfin_read_SICB_IMASK1();
1157 #endif
1158                 } else {
1159                         sic_status[0] = bfin_read_SIC_ISR0() & bfin_read_SIC_IMASK0();
1160                         sic_status[1] = bfin_read_SIC_ISR1() & bfin_read_SIC_IMASK1();
1161                 }
1162 #ifdef CONFIG_BF54x
1163                 sic_status[2] = bfin_read_SIC_ISR2() & bfin_read_SIC_IMASK2();
1164 #endif
1165                 for (;; ivg++) {
1166                         if (ivg >= ivg_stop) {
1167                                 atomic_inc(&num_spurious);
1168                                 return;
1169                         }
1170                         if (sic_status[(ivg->irqno - IVG7) / 32] & ivg->isrflag)
1171                                 break;
1172                 }
1173 #else
1174                 unsigned long sic_status;
1175
1176                 sic_status = bfin_read_SIC_IMASK() & bfin_read_SIC_ISR();
1177
1178                 for (;; ivg++) {
1179                         if (ivg >= ivg_stop) {
1180                                 atomic_inc(&num_spurious);
1181                                 return;
1182                         } else if (sic_status & ivg->isrflag)
1183                                 break;
1184                 }
1185 #endif
1186                 vec = ivg->irqno;
1187         }
1188         asm_do_IRQ(vec, fp);
1189 }
1190
1191 #ifdef CONFIG_IPIPE
1192
1193 int __ipipe_get_irq_priority(unsigned irq)
1194 {
1195         int ient, prio;
1196
1197         if (irq <= IRQ_CORETMR)
1198                 return irq;
1199
1200         for (ient = 0; ient < NR_PERI_INTS; ient++) {
1201                 struct ivgx *ivg = ivg_table + ient;
1202                 if (ivg->irqno == irq) {
1203                         for (prio = 0; prio <= IVG13-IVG7; prio++) {
1204                                 if (ivg7_13[prio].ifirst <= ivg &&
1205                                     ivg7_13[prio].istop > ivg)
1206                                         return IVG7 + prio;
1207                         }
1208                 }
1209         }
1210
1211         return IVG15;
1212 }
1213
1214 int __ipipe_get_irqthread_priority(unsigned irq)
1215 {
1216         int ient, prio;
1217         int demux_irq;
1218
1219         /* The returned priority value is rescaled to [0..IVG13+1]
1220          * with 0 being the lowest effective priority level. */
1221
1222         if (irq <= IRQ_CORETMR)
1223                 return IVG13 - irq + 1;
1224
1225         /* GPIO IRQs are given the priority of the demux
1226          * interrupt. */
1227         if (IS_GPIOIRQ(irq)) {
1228 #if defined(CONFIG_BF54x)
1229                 u32 bank = PINT_2_BANK(irq2pint_lut[irq - SYS_IRQS]);
1230                 demux_irq = (bank == 0 ? IRQ_PINT0 :
1231                                 bank == 1 ? IRQ_PINT1 :
1232                                 bank == 2 ? IRQ_PINT2 :
1233                                 IRQ_PINT3);
1234 #elif defined(CONFIG_BF561)
1235                 demux_irq = (irq >= IRQ_PF32 ? IRQ_PROG2_INTA :
1236                                 irq >= IRQ_PF16 ? IRQ_PROG1_INTA :
1237                                 IRQ_PROG0_INTA);
1238 #elif defined(CONFIG_BF52x)
1239                 demux_irq = (irq >= IRQ_PH0 ? IRQ_PORTH_INTA :
1240                                 irq >= IRQ_PG0 ? IRQ_PORTG_INTA :
1241                                 IRQ_PORTF_INTA);
1242 #else
1243                 demux_irq = irq;
1244 #endif
1245                 return IVG13 - PRIO_GPIODEMUX(demux_irq) + 1;
1246         }
1247
1248         /* The GPIO demux interrupt is given a lower priority
1249          * than the GPIO IRQs, so that its threaded handler
1250          * unmasks the interrupt line after the decoded IRQs
1251          * have been processed. */
1252         prio = PRIO_GPIODEMUX(irq);
1253         /* demux irq? */
1254         if (prio != -1)
1255                 return IVG13 - prio;
1256
1257         for (ient = 0; ient < NR_PERI_INTS; ient++) {
1258                 struct ivgx *ivg = ivg_table + ient;
1259                 if (ivg->irqno == irq) {
1260                         for (prio = 0; prio <= IVG13-IVG7; prio++) {
1261                                 if (ivg7_13[prio].ifirst <= ivg &&
1262                                     ivg7_13[prio].istop > ivg)
1263                                         return IVG7 - prio;
1264                         }
1265                 }
1266         }
1267
1268         return 0;
1269 }
1270
1271 /* Hw interrupts are disabled on entry (check SAVE_CONTEXT). */
1272 #ifdef CONFIG_DO_IRQ_L1
1273 __attribute__((l1_text))
1274 #endif
1275 asmlinkage int __ipipe_grab_irq(int vec, struct pt_regs *regs)
1276 {
1277         struct ivgx *ivg_stop = ivg7_13[vec-IVG7].istop;
1278         struct ivgx *ivg = ivg7_13[vec-IVG7].ifirst;
1279         int irq;
1280
1281         if (likely(vec == EVT_IVTMR_P)) {
1282                 irq = IRQ_CORETMR;
1283                 goto handle_irq;
1284         }
1285
1286         SSYNC();
1287
1288 #if defined(CONFIG_BF54x) || defined(CONFIG_BF52x) || defined(CONFIG_BF561)
1289         {
1290                 unsigned long sic_status[3];
1291
1292                 sic_status[0] = bfin_read_SIC_ISR0() & bfin_read_SIC_IMASK0();
1293                 sic_status[1] = bfin_read_SIC_ISR1() & bfin_read_SIC_IMASK1();
1294 #ifdef CONFIG_BF54x
1295                 sic_status[2] = bfin_read_SIC_ISR2() & bfin_read_SIC_IMASK2();
1296 #endif
1297                 for (;; ivg++) {
1298                         if (ivg >= ivg_stop) {
1299                                 atomic_inc(&num_spurious);
1300                                 return 0;
1301                         }
1302                         if (sic_status[(ivg->irqno - IVG7) / 32] & ivg->isrflag)
1303                                 break;
1304                 }
1305         }
1306 #else
1307         {
1308                 unsigned long sic_status;
1309
1310                 sic_status = bfin_read_SIC_IMASK() & bfin_read_SIC_ISR();
1311
1312                 for (;; ivg++) {
1313                         if (ivg >= ivg_stop) {
1314                                 atomic_inc(&num_spurious);
1315                                 return 0;
1316                         } else if (sic_status & ivg->isrflag)
1317                                 break;
1318                 }
1319         }
1320 #endif
1321
1322         irq = ivg->irqno;
1323
1324         if (irq == IRQ_SYSTMR) {
1325                 bfin_write_TIMER_STATUS(1); /* Latch TIMIL0 */
1326                 /* This is basically what we need from the register frame. */
1327                 __raw_get_cpu_var(__ipipe_tick_regs).ipend = regs->ipend;
1328                 __raw_get_cpu_var(__ipipe_tick_regs).pc = regs->pc;
1329                 if (!ipipe_root_domain_p)
1330                         __raw_get_cpu_var(__ipipe_tick_regs).ipend |= 0x10;
1331                 else
1332                         __raw_get_cpu_var(__ipipe_tick_regs).ipend &= ~0x10;
1333         }
1334
1335 handle_irq:
1336
1337         ipipe_trace_irq_entry(irq);
1338         __ipipe_handle_irq(irq, regs);
1339        ipipe_trace_irq_exit(irq);
1340
1341        if (ipipe_root_domain_p)
1342                 return !test_bit(IPIPE_STALL_FLAG, &ipipe_root_cpudom_var(status));
1343
1344        return 0;
1345 }
1346
1347 #endif /* CONFIG_IPIPE */