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

   1 /*
   2  * File:         arch/blackfin/mach-common/ints-priority-sc.c
   3  * Based on:
   4  * Author:
   5  *
   6  * Created:      ?
   7  * Description:  Set up the interrupt priorities
   8  *
   9  * Modified:
  10  *               1996 Roman Zippel
  11  *               1999 D. Jeff Dionne <jeff@uclinux.org>
  12  *               2000-2001 Lineo, Inc. D. Jefff Dionne <jeff@lineo.ca>
  13  *               2002 Arcturus Networks Inc. MaTed <mated@sympatico.ca>
  14  *               2003 Metrowerks/Motorola
  15  *               2003 Bas Vermeulen <bas@buyways.nl>
  16  *               Copyright 2004-2007 Analog Devices Inc.
  17  *
  18  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  19  *
  20  * This program is free software; you can redistribute it and/or modify
  21  * it under the terms of the GNU General Public License as published by
  22  * the Free Software Foundation; either version 2 of the License, or
  23  * (at your option) any later version.
  24  *
  25  * This program is distributed in the hope that it will be useful,
  26  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  * GNU General Public License for more details.
  29  *
  30  * You should have received a copy of the GNU General Public License
  31  * along with this program; if not, see the file COPYING, or write
  32  * to the Free Software Foundation, Inc.,
  33  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  34  */
  35
  36 #include <linux/module.h>
  37 #include <linux/kernel_stat.h>
  38 #include <linux/seq_file.h>
  39 #include <linux/irq.h>
  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 #ifdef BF537_FAMILY
  49 # define BF537_GENERIC_ERROR_INT_DEMUX
  50 #else
  51 # undef BF537_GENERIC_ERROR_INT_DEMUX
  52 #endif
  53
  54 /*
  55  * NOTES:
  56  * - we have separated the physical Hardware interrupt from the
  57  * levels that the LINUX kernel sees (see the description in irq.h)
  58  * -
  59  */
  60
  61 unsigned long irq_flags = 0;
  62
  63 /* The number of spurious interrupts */
  64 atomic_t num_spurious;
  65
  66 struct ivgx {
  67         /* irq number for request_irq, available in mach-bf533/irq.h */
  68         unsigned int irqno;
  69         /* corresponding bit in the SIC_ISR register */
  70         unsigned int isrflag;
  71 } ivg_table[NR_PERI_INTS];
  72
  73 struct ivg_slice {
  74         /* position of first irq in ivg_table for given ivg */
  75         struct ivgx *ifirst;
  76         struct ivgx *istop;
  77 } ivg7_13[IVG13 - IVG7 + 1];
  78
  79 static void search_IAR(void);
  80
  81 /*
  82  * Search SIC_IAR and fill tables with the irqvalues
  83  * and their positions in the SIC_ISR register.
  84  */
  85 static void __init search_IAR(void)
  86 {
  87         unsigned ivg, irq_pos = 0;
  88         for (ivg = 0; ivg <= IVG13 - IVG7; ivg++) {
  89                 int irqn;
  90
  91                 ivg7_13[ivg].istop = ivg7_13[ivg].ifirst = &ivg_table[irq_pos];
  92
  93                 for (irqn = 0; irqn < NR_PERI_INTS; irqn++) {
  94                         int iar_shift = (irqn & 7) * 4;
  95                         if (ivg ==
  96                             (0xf &
  97                              bfin_read32((unsigned long *)SIC_IAR0 +
  98                                          (irqn >> 3)) >> iar_shift)) {
  99                                 ivg_table[irq_pos].irqno = IVG7 + irqn;
 100                                 ivg_table[irq_pos].isrflag = 1 << (irqn % 32);
 101                                 ivg7_13[ivg].istop++;
 102                                 irq_pos++;
 103                         }
 104                 }
 105         }
 106 }
 107
 108 /*
 109  * This is for BF533 internal IRQs
 110  */
 111
 112 static void ack_noop(unsigned int irq)
 113 {
 114         /* Dummy function.  */
 115 }
 116
 117 static void bfin_core_mask_irq(unsigned int irq)
 118 {
 119         irq_flags &= ~(1 << irq);
 120         if (!irqs_disabled())
 121                 local_irq_enable();
 122 }
 123
 124 static void bfin_core_unmask_irq(unsigned int irq)
 125 {
 126         irq_flags |= 1 << irq;
 127         /*
 128          * If interrupts are enabled, IMASK must contain the same value
 129          * as irq_flags.  Make sure that invariant holds.  If interrupts
 130          * are currently disabled we need not do anything; one of the
 131          * callers will take care of setting IMASK to the proper value
 132          * when reenabling interrupts.
 133          * local_irq_enable just does "STI irq_flags", so it's exactly
 134          * what we need.
 135          */
 136         if (!irqs_disabled())
 137                 local_irq_enable();
 138         return;
 139 }
 140
 141 static void bfin_internal_mask_irq(unsigned int irq)
 142 {
 143 #ifndef CONFIG_BF54x
 144         bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() &
 145                              ~(1 << (irq - (IRQ_CORETMR + 1))));
 146 #else
 147         unsigned mask_bank, mask_bit;
 148         mask_bank = (irq - (IRQ_CORETMR + 1)) / 32;
 149         mask_bit = (irq - (IRQ_CORETMR + 1)) % 32;
 150         bfin_write_SIC_IMASK( mask_bank, bfin_read_SIC_IMASK(mask_bank) & \
 151                             ~(1 << mask_bit));
 152 #endif
 153         SSYNC();
 154 }
 155
 156 static void bfin_internal_unmask_irq(unsigned int irq)
 157 {
 158 #ifndef CONFIG_BF54x
 159         bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() |
 160                              (1 << (irq - (IRQ_CORETMR + 1))));
 161 #else
 162         unsigned mask_bank, mask_bit;
 163         mask_bank = (irq - (IRQ_CORETMR + 1)) / 32;
 164         mask_bit = (irq - (IRQ_CORETMR + 1))%32;
 165         bfin_write_SIC_IMASK(mask_bank, bfin_read_SIC_IMASK(mask_bank) | \
 166                         ( 1 << mask_bit));
 167 #endif
 168         SSYNC();
 169 }
 170
 171 static struct irq_chip bfin_core_irqchip = {
 172         .ack = ack_noop,
 173         .mask = bfin_core_mask_irq,
 174         .unmask = bfin_core_unmask_irq,
 175 };
 176
 177 static struct irq_chip bfin_internal_irqchip = {
 178         .ack = ack_noop,
 179         .mask = bfin_internal_mask_irq,
 180         .unmask = bfin_internal_unmask_irq,
 181 };
 182
 183 #ifdef BF537_GENERIC_ERROR_INT_DEMUX
 184 static int error_int_mask;
 185
 186 static void bfin_generic_error_ack_irq(unsigned int irq)
 187 {
 188
 189 }
 190
 191 static void bfin_generic_error_mask_irq(unsigned int irq)
 192 {
 193         error_int_mask &= ~(1L << (irq - IRQ_PPI_ERROR));
 194
 195         if (!error_int_mask) {
 196                 local_irq_disable();
 197                 bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() &
 198                                      ~(1 <<
 199                                        (IRQ_GENERIC_ERROR -
 200                                         (IRQ_CORETMR + 1))));
 201                 SSYNC();
 202                 local_irq_enable();
 203         }
 204 }
 205
 206 static void bfin_generic_error_unmask_irq(unsigned int irq)
 207 {
 208         local_irq_disable();
 209         bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() | 1 <<
 210                              (IRQ_GENERIC_ERROR - (IRQ_CORETMR + 1)));
 211         SSYNC();
 212         local_irq_enable();
 213
 214         error_int_mask |= 1L << (irq - IRQ_PPI_ERROR);
 215 }
 216
 217 static struct irq_chip bfin_generic_error_irqchip = {
 218         .ack = bfin_generic_error_ack_irq,
 219         .mask = bfin_generic_error_mask_irq,
 220         .unmask = bfin_generic_error_unmask_irq,
 221 };
 222
 223 static void bfin_demux_error_irq(unsigned int int_err_irq,
 224                                  struct irq_desc *intb_desc)
 225 {
 226         int irq = 0;
 227
 228         SSYNC();
 229
 230 #if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
 231         if (bfin_read_EMAC_SYSTAT() & EMAC_ERR_MASK)
 232                 irq = IRQ_MAC_ERROR;
 233         else
 234 #endif
 235         if (bfin_read_SPORT0_STAT() & SPORT_ERR_MASK)
 236                 irq = IRQ_SPORT0_ERROR;
 237         else if (bfin_read_SPORT1_STAT() & SPORT_ERR_MASK)
 238                 irq = IRQ_SPORT1_ERROR;
 239         else if (bfin_read_PPI_STATUS() & PPI_ERR_MASK)
 240                 irq = IRQ_PPI_ERROR;
 241         else if (bfin_read_CAN_GIF() & CAN_ERR_MASK)
 242                 irq = IRQ_CAN_ERROR;
 243         else if (bfin_read_SPI_STAT() & SPI_ERR_MASK)
 244                 irq = IRQ_SPI_ERROR;
 245         else if ((bfin_read_UART0_IIR() & UART_ERR_MASK_STAT1) &&
 246                  (bfin_read_UART0_IIR() & UART_ERR_MASK_STAT0))
 247                 irq = IRQ_UART0_ERROR;
 248         else if ((bfin_read_UART1_IIR() & UART_ERR_MASK_STAT1) &&
 249                  (bfin_read_UART1_IIR() & UART_ERR_MASK_STAT0))
 250                 irq = IRQ_UART1_ERROR;
 251
 252         if (irq) {
 253                 if (error_int_mask & (1L << (irq - IRQ_PPI_ERROR))) {
 254                         struct irq_desc *desc = irq_desc + irq;
 255                         desc->handle_irq(irq, desc);
 256                 } else {
 257
 258                         switch (irq) {
 259                         case IRQ_PPI_ERROR:
 260                                 bfin_write_PPI_STATUS(PPI_ERR_MASK);
 261                                 break;
 262 #if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
 263                         case IRQ_MAC_ERROR:
 264                                 bfin_write_EMAC_SYSTAT(EMAC_ERR_MASK);
 265                                 break;
 266 #endif
 267                         case IRQ_SPORT0_ERROR:
 268                                 bfin_write_SPORT0_STAT(SPORT_ERR_MASK);
 269                                 break;
 270
 271                         case IRQ_SPORT1_ERROR:
 272                                 bfin_write_SPORT1_STAT(SPORT_ERR_MASK);
 273                                 break;
 274
 275                         case IRQ_CAN_ERROR:
 276                                 bfin_write_CAN_GIS(CAN_ERR_MASK);
 277                                 break;
 278
 279                         case IRQ_SPI_ERROR:
 280                                 bfin_write_SPI_STAT(SPI_ERR_MASK);
 281                                 break;
 282
 283                         default:
 284                                 break;
 285                         }
 286
 287                         pr_debug("IRQ %d:"
 288                                  " MASKED PERIPHERAL ERROR INTERRUPT ASSERTED\n",
 289                                  irq);
 290                 }
 291         } else
 292                 printk(KERN_ERR
 293                        "%s : %s : LINE %d :\nIRQ ?: PERIPHERAL ERROR"
 294                        " INTERRUPT ASSERTED BUT NO SOURCE FOUND\n",
 295                        __FUNCTION__, __FILE__, __LINE__);
 296
 297 }
 298 #endif                          /* BF537_GENERIC_ERROR_INT_DEMUX */
 299
 300 #if defined(CONFIG_IRQCHIP_DEMUX_GPIO) && !defined(CONFIG_BF54x)
 301
 302 static unsigned short gpio_enabled[gpio_bank(MAX_BLACKFIN_GPIOS)];
 303 static unsigned short gpio_edge_triggered[gpio_bank(MAX_BLACKFIN_GPIOS)];
 304
 305 static void bfin_gpio_ack_irq(unsigned int irq)
 306 {
 307         u16 gpionr = irq - IRQ_PF0;
 308
 309         if (gpio_edge_triggered[gpio_bank(gpionr)] & gpio_bit(gpionr)) {
 310                 set_gpio_data(gpionr, 0);
 311                 SSYNC();
 312         }
 313 }
 314
 315 static void bfin_gpio_mask_ack_irq(unsigned int irq)
 316 {
 317         u16 gpionr = irq - IRQ_PF0;
 318
 319         if (gpio_edge_triggered[gpio_bank(gpionr)] & gpio_bit(gpionr)) {
 320                 set_gpio_data(gpionr, 0);
 321                 SSYNC();
 322         }
 323
 324         set_gpio_maska(gpionr, 0);
 325         SSYNC();
 326 }
 327
 328 static void bfin_gpio_mask_irq(unsigned int irq)
 329 {
 330         set_gpio_maska(irq - IRQ_PF0, 0);
 331         SSYNC();
 332 }
 333
 334 static void bfin_gpio_unmask_irq(unsigned int irq)
 335 {
 336         set_gpio_maska(irq - IRQ_PF0, 1);
 337         SSYNC();
 338 }
 339
 340 static unsigned int bfin_gpio_irq_startup(unsigned int irq)
 341 {
 342         unsigned int ret;
 343         u16 gpionr = irq - IRQ_PF0;
 344
 345         if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
 346                 ret = gpio_request(gpionr, NULL);
 347                 if (ret)
 348                         return ret;
 349         }
 350
 351         gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
 352         bfin_gpio_unmask_irq(irq);
 353
 354         return ret;
 355 }
 356
 357 static void bfin_gpio_irq_shutdown(unsigned int irq)
 358 {
 359         bfin_gpio_mask_irq(irq);
 360         gpio_free(irq - IRQ_PF0);
 361         gpio_enabled[gpio_bank(irq - IRQ_PF0)] &= ~gpio_bit(irq - IRQ_PF0);
 362 }
 363
 364 static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 365 {
 366
 367         unsigned int ret;
 368         u16 gpionr = irq - IRQ_PF0;
 369
 370         if (type == IRQ_TYPE_PROBE) {
 371                 /* only probe unenabled GPIO interrupt lines */
 372                 if (gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))
 373                         return 0;
 374                 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 375         }
 376
 377         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
 378                     IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
 379                 if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
 380                         ret = gpio_request(gpionr, NULL);
 381                         if (ret)
 382                                 return ret;
 383                 }
 384
 385                 gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
 386         } else {
 387                 gpio_enabled[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
 388                 return 0;
 389         }
 390
 391         set_gpio_dir(gpionr, 0);
 392         set_gpio_inen(gpionr, 1);
 393
 394         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
 395                 gpio_edge_triggered[gpio_bank(gpionr)] |= gpio_bit(gpionr);
 396                 set_gpio_edge(gpionr, 1);
 397         } else {
 398                 set_gpio_edge(gpionr, 0);
 399                 gpio_edge_triggered[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
 400         }
 401
 402         if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 403             == (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 404                 set_gpio_both(gpionr, 1);
 405         else
 406                 set_gpio_both(gpionr, 0);
 407
 408         if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
 409                 set_gpio_polar(gpionr, 1);      /* low or falling edge denoted by one */
 410         else
 411                 set_gpio_polar(gpionr, 0);      /* high or rising edge denoted by zero */
 412
 413         SSYNC();
 414
 415         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 416                 set_irq_handler(irq, handle_edge_irq);
 417         else
 418                 set_irq_handler(irq, handle_level_irq);
 419
 420         return 0;
 421 }
 422
 423 static struct irq_chip bfin_gpio_irqchip = {
 424         .ack = bfin_gpio_ack_irq,
 425         .mask = bfin_gpio_mask_irq,
 426         .mask_ack = bfin_gpio_mask_ack_irq,
 427         .unmask = bfin_gpio_unmask_irq,
 428         .set_type = bfin_gpio_irq_type,
 429         .startup = bfin_gpio_irq_startup,
 430         .shutdown = bfin_gpio_irq_shutdown
 431 };
 432
 433 static void bfin_demux_gpio_irq(unsigned int intb_irq,
 434                                 struct irq_desc *intb_desc)
 435 {
 436         u16 i;
 437
 438         for (i = 0; i < MAX_BLACKFIN_GPIOS; i += 16) {
 439                 int irq = IRQ_PF0 + i;
 440                 int flag_d = get_gpiop_data(i);
 441                 int mask =
 442                     flag_d & (gpio_enabled[gpio_bank(i)] & get_gpiop_maska(i));
 443
 444                 while (mask) {
 445                         if (mask & 1) {
 446                                 struct irq_desc *desc = irq_desc + irq;
 447                                 desc->handle_irq(irq, desc);
 448                         }
 449                         irq++;
 450                         mask >>= 1;
 451                 }
 452         }
 453 }
 454
 455 #else                           /* CONFIG_IRQCHIP_DEMUX_GPIO */
 456
 457 #define NR_PINT_SYS_IRQS        4
 458 #define NR_PINT_BITS            32
 459 #define NR_PINTS                160
 460 #define IRQ_NOT_AVAIL           0xFF
 461
 462 #define PINT_2_BANK(x)          ((x) >> 5)
 463 #define PINT_2_BIT(x)           ((x) & 0x1F)
 464 #define PINT_BIT(x)             (1 << (PINT_2_BIT(x)))
 465
 466 static unsigned char irq2pint_lut[NR_PINTS];
 467 static unsigned short pint2irq_lut[NR_PINT_SYS_IRQS * NR_PINT_BITS];
 468
 469 struct pin_int_t {
 470         unsigned int mask_set;
 471         unsigned int mask_clear;
 472         unsigned int request;
 473         unsigned int assign;
 474         unsigned int edge_set;
 475         unsigned int edge_clear;
 476         unsigned int invert_set;
 477         unsigned int invert_clear;
 478         unsigned int pinstate;
 479         unsigned int latch;
 480 };
 481
 482 static struct pin_int_t *pint[NR_PINT_SYS_IRQS] = {
 483         (struct pin_int_t *)PINT0_MASK_SET,
 484         (struct pin_int_t *)PINT1_MASK_SET,
 485         (struct pin_int_t *)PINT2_MASK_SET,
 486         (struct pin_int_t *)PINT3_MASK_SET,
 487 };
 488
 489 unsigned short get_irq_base(u8 bank, u8 bmap)
 490 {
 491
 492         u16 irq_base;
 493
 494         if (bank < 2) {         /*PA-PB */
 495                 irq_base = IRQ_PA0 + bmap * 16;
 496         } else {                /*PC-PJ */
 497                 irq_base = IRQ_PC0 + bmap * 16;
 498         }
 499
 500         return irq_base;
 501
 502 }
 503
 504         /* Whenever PINTx_ASSIGN is altered init_pint_lut() must be executed! */
 505 void init_pint_lut(void)
 506 {
 507         u16 bank, bit, irq_base, bit_pos;
 508         u32 pint_assign;
 509         u8 bmap;
 510
 511         memset(irq2pint_lut, IRQ_NOT_AVAIL, sizeof(irq2pint_lut));
 512
 513         for (bank = 0; bank < NR_PINT_SYS_IRQS; bank++) {
 514
 515                 pint_assign = pint[bank]->assign;
 516
 517                 for (bit = 0; bit < NR_PINT_BITS; bit++) {
 518
 519                         bmap = (pint_assign >> ((bit / 8) * 8)) & 0xFF;
 520
 521                         irq_base = get_irq_base(bank, bmap);
 522
 523                         irq_base += (bit % 8) + ((bit / 8) & 1 ? 8 : 0);
 524                         bit_pos = bit + bank * NR_PINT_BITS;
 525
 526                         pint2irq_lut[bit_pos] = irq_base;
 527                         irq2pint_lut[irq_base - SYS_IRQS] = bit_pos;
 528
 529                 }
 530
 531         }
 532
 533 }
 534
 535 static unsigned short gpio_enabled[gpio_bank(MAX_BLACKFIN_GPIOS)];
 536
 537 static void bfin_gpio_ack_irq(unsigned int irq)
 538 {
 539         u8 pint_val = irq2pint_lut[irq - SYS_IRQS];
 540
 541         pint[PINT_2_BANK(pint_val)]->request = PINT_BIT(pint_val);
 542         SSYNC();
 543 }
 544
 545 static void bfin_gpio_mask_ack_irq(unsigned int irq)
 546 {
 547         u8 pint_val = irq2pint_lut[irq - SYS_IRQS];
 548
 549         pint[PINT_2_BANK(pint_val)]->request = PINT_BIT(pint_val);
 550         pint[PINT_2_BANK(pint_val)]->mask_clear = PINT_BIT(pint_val);
 551         SSYNC();
 552 }
 553
 554 static void bfin_gpio_mask_irq(unsigned int irq)
 555 {
 556         u8 pint_val = irq2pint_lut[irq - SYS_IRQS];
 557
 558         pint[PINT_2_BANK(pint_val)]->mask_clear = PINT_BIT(pint_val);
 559         SSYNC();
 560 }
 561
 562 static void bfin_gpio_unmask_irq(unsigned int irq)
 563 {
 564         u8 pint_val = irq2pint_lut[irq - SYS_IRQS];
 565
 566         pint[PINT_2_BANK(pint_val)]->request = PINT_BIT(pint_val);
 567         pint[PINT_2_BANK(pint_val)]->mask_set = PINT_BIT(pint_val);
 568         SSYNC();
 569 }
 570
 571 static unsigned int bfin_gpio_irq_startup(unsigned int irq)
 572 {
 573         unsigned int ret;
 574         u16 gpionr = irq - IRQ_PA0;
 575         u8 pint_val = irq2pint_lut[irq - SYS_IRQS];
 576
 577         if (pint_val == IRQ_NOT_AVAIL)
 578                 return -ENODEV;
 579
 580         if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
 581                 ret = gpio_request(gpionr, NULL);
 582                 if (ret)
 583                         return ret;
 584         }
 585
 586         gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
 587         bfin_gpio_unmask_irq(irq);
 588
 589         return ret;
 590 }
 591
 592 static void bfin_gpio_irq_shutdown(unsigned int irq)
 593 {
 594         bfin_gpio_mask_irq(irq);
 595         gpio_free(irq - IRQ_PA0);
 596         gpio_enabled[gpio_bank(irq - IRQ_PA0)] &= ~gpio_bit(irq - IRQ_PA0);
 597 }
 598
 599 static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 600 {
 601
 602         unsigned int ret;
 603         u16 gpionr = irq - IRQ_PA0;
 604         u8 pint_val = irq2pint_lut[irq - SYS_IRQS];
 605
 606         if (pint_val == IRQ_NOT_AVAIL)
 607                 return -ENODEV;
 608
 609         if (type == IRQ_TYPE_PROBE) {
 610                 /* only probe unenabled GPIO interrupt lines */
 611                 if (gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))
 612                         return 0;
 613                 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 614         }
 615
 616         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
 617                     IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) {
 618                 if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
 619                         ret = gpio_request(gpionr, NULL);
 620                         if (ret)
 621                                 return ret;
 622                 }
 623
 624                 gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
 625         } else {
 626                 gpio_enabled[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
 627                 return 0;
 628         }
 629
 630         gpio_direction_input(gpionr);
 631
 632         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
 633                 pint[PINT_2_BANK(pint_val)]->edge_set = PINT_BIT(pint_val);
 634         } else {
 635                 pint[PINT_2_BANK(pint_val)]->edge_clear = PINT_BIT(pint_val);
 636         }
 637
 638         if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
 639                 pint[PINT_2_BANK(pint_val)]->invert_set = PINT_BIT(pint_val);   /* low or falling edge denoted by one */
 640         else
 641                 pint[PINT_2_BANK(pint_val)]->invert_set = PINT_BIT(pint_val);   /* high or rising edge denoted by zero */
 642
 643         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 644                 pint[PINT_2_BANK(pint_val)]->invert_set = PINT_BIT(pint_val);
 645         else
 646                 pint[PINT_2_BANK(pint_val)]->invert_set = PINT_BIT(pint_val);
 647
 648         SSYNC();
 649
 650         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 651                 set_irq_handler(irq, handle_edge_irq);
 652         else
 653                 set_irq_handler(irq, handle_level_irq);
 654
 655         return 0;
 656 }
 657
 658 static struct irq_chip bfin_gpio_irqchip = {
 659         .ack = bfin_gpio_ack_irq,
 660         .mask = bfin_gpio_mask_irq,
 661         .mask_ack = bfin_gpio_mask_ack_irq,
 662         .unmask = bfin_gpio_unmask_irq,
 663         .set_type = bfin_gpio_irq_type,
 664         .startup = bfin_gpio_irq_startup,
 665         .shutdown = bfin_gpio_irq_shutdown
 666 };
 667
 668 static void bfin_demux_gpio_irq(unsigned int intb_irq,
 669                                 struct irq_desc *intb_desc)
 670 {
 671         u8 bank, pint_val;
 672         u32 request, irq;
 673
 674         switch (intb_irq) {
 675         case IRQ_PINT0:
 676                 bank = 0;
 677                 break;
 678         case IRQ_PINT2:
 679                 bank = 2;
 680                 break;
 681         case IRQ_PINT3:
 682                 bank = 3;
 683                 break;
 684         case IRQ_PINT1:
 685                 bank = 1;
 686                 break;
 687         }
 688
 689         pint_val = bank * NR_PINT_BITS;
 690
 691         request = pint[bank]->request;
 692
 693         while (request) {
 694                 if (request & 1) {
 695                         irq = pint2irq_lut[pint_val];
 696                         struct irq_desc *desc = irq_desc + irq;
 697                         desc->handle_irq(irq, desc);
 698                 }
 699                 pint_val++;
 700                 request >>= 1;
 701         }
 702
 703 }
 704 #endif                          /* CONFIG_IRQCHIP_DEMUX_GPIO */
 705
 706 /*
 707  * This function should be called during kernel startup to initialize
 708  * the BFin IRQ handling routines.
 709  */
 710 int __init init_arch_irq(void)
 711 {
 712         int irq;
 713         unsigned long ilat = 0;
 714         /*  Disable all the peripheral intrs  - page 4-29 HW Ref manual */
 715 #ifdef CONFIG_BF54x
 716         bfin_write_SIC_IMASK0(SIC_UNMASK_ALL);
 717         bfin_write_SIC_IMASK1(SIC_UNMASK_ALL);
 718         bfin_write_SIC_IMASK2(SIC_UNMASK_ALL);
 719         bfin_write_SIC_IWR0(IWR_ENABLE_ALL);
 720         bfin_write_SIC_IWR1(IWR_ENABLE_ALL);
 721         bfin_write_SIC_IWR2(IWR_ENABLE_ALL);
 722 #else
 723         bfin_write_SIC_IMASK(SIC_UNMASK_ALL);
 724         bfin_write_SIC_IWR(IWR_ENABLE_ALL);
 725 #endif
 726
 727         SSYNC();
 728
 729         local_irq_disable();
 730
 731 #ifndef CONFIG_KGDB
 732         bfin_write_EVT0(evt_emulation);
 733 #endif
 734         bfin_write_EVT2(evt_evt2);
 735         bfin_write_EVT3(trap);
 736         bfin_write_EVT5(evt_ivhw);
 737         bfin_write_EVT6(evt_timer);
 738         bfin_write_EVT7(evt_evt7);
 739         bfin_write_EVT8(evt_evt8);
 740         bfin_write_EVT9(evt_evt9);
 741         bfin_write_EVT10(evt_evt10);
 742         bfin_write_EVT11(evt_evt11);
 743         bfin_write_EVT12(evt_evt12);
 744         bfin_write_EVT13(evt_evt13);
 745         bfin_write_EVT14(evt14_softirq);
 746         bfin_write_EVT15(evt_system_call);
 747         CSYNC();
 748
 749 #if defined(CONFIG_IRQCHIP_DEMUX_GPIO) && defined(CONFIG_BF54x)
 750 #ifdef CONFIG_PINTx_REASSIGN
 751         pint[0]->assign = CONFIG_PINT0_ASSIGN;
 752         pint[1]->assign = CONFIG_PINT1_ASSIGN;
 753         pint[2]->assign = CONFIG_PINT2_ASSIGN;
 754         pint[3]->assign = CONFIG_PINT3_ASSIGN;
 755 #endif
 756         /* Whenever PINTx_ASSIGN is altered init_pint_lut() must be executed! */
 757         init_pint_lut();
 758 #endif
 759
 760         for (irq = 0; irq <= SYS_IRQS; irq++) {
 761                 if (irq <= IRQ_CORETMR)
 762                         set_irq_chip(irq, &bfin_core_irqchip);
 763                 else
 764                         set_irq_chip(irq, &bfin_internal_irqchip);
 765 #ifdef BF537_GENERIC_ERROR_INT_DEMUX
 766                 if (irq != IRQ_GENERIC_ERROR) {
 767 #endif
 768
 769                         switch (irq) {
 770 #ifdef CONFIG_IRQCHIP_DEMUX_GPIO
 771 #ifndef CONFIG_BF54x
 772                         case IRQ_PROG_INTA:
 773                                 set_irq_chained_handler(irq,
 774                                                         bfin_demux_gpio_irq);
 775                                 break;
 776 #if defined(BF537_FAMILY) && !(defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
 777                         case IRQ_MAC_RX:
 778                                 set_irq_chained_handler(irq,
 779                                                         bfin_demux_gpio_irq);
 780                                 break;
 781 #endif
 782 #else
 783                         case IRQ_PINT0:
 784                                 set_irq_chained_handler(irq,
 785                                                         bfin_demux_gpio_irq);
 786                                 break;
 787                         case IRQ_PINT1:
 788                                 set_irq_chained_handler(irq,
 789                                                         bfin_demux_gpio_irq);
 790                                 break;
 791                         case IRQ_PINT2:
 792                                 set_irq_chained_handler(irq,
 793                                                         bfin_demux_gpio_irq);
 794                                 break;
 795                         case IRQ_PINT3:
 796                                 set_irq_chained_handler(irq,
 797                                                         bfin_demux_gpio_irq);
 798                                 break;
 799 #endif                          /*CONFIG_BF54x */
 800 #endif
 801                         default:
 802                                 set_irq_handler(irq, handle_simple_irq);
 803                                 break;
 804                         }
 805
 806 #ifdef BF537_GENERIC_ERROR_INT_DEMUX
 807                 } else {
 808                         set_irq_handler(irq, bfin_demux_error_irq);
 809                 }
 810 #endif
 811         }
 812 #ifdef BF537_GENERIC_ERROR_INT_DEMUX
 813         for (irq = IRQ_PPI_ERROR; irq <= IRQ_UART1_ERROR; irq++) {
 814                 set_irq_chip(irq, &bfin_generic_error_irqchip);
 815                 set_irq_handler(irq, handle_level_irq);
 816         }
 817 #endif
 818
 819 #ifdef CONFIG_IRQCHIP_DEMUX_GPIO
 820 #ifndef CONFIG_BF54x
 821         for (irq = IRQ_PF0; irq < NR_IRQS; irq++) {
 822 #else
 823         for (irq = IRQ_PA0; irq < NR_IRQS; irq++) {
 824 #endif
 825                 set_irq_chip(irq, &bfin_gpio_irqchip);
 826                 /* if configured as edge, then will be changed to do_edge_IRQ */
 827                 set_irq_handler(irq, handle_level_irq);
 828         }
 829 #endif
 830         bfin_write_IMASK(0);
 831         CSYNC();
 832         ilat = bfin_read_ILAT();
 833         CSYNC();
 834         bfin_write_ILAT(ilat);
 835         CSYNC();
 836
 837         printk(KERN_INFO "Configuring Blackfin Priority Driven Interrupts\n");
 838         /* IMASK=xxx is equivalent to STI xx or irq_flags=xx,
 839          * local_irq_enable()
 840          */
 841         program_IAR();
 842         /* Therefore it's better to setup IARs before interrupts enabled */
 843         search_IAR();
 844
 845         /* Enable interrupts IVG7-15 */
 846         irq_flags = irq_flags | IMASK_IVG15 |
 847             IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
 848             IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 | IMASK_IVGHW;
 849
 850         return 0;
 851 }
 852
 853 #ifdef CONFIG_DO_IRQ_L1
 854 void do_irq(int vec, struct pt_regs *fp) __attribute__((l1_text));
 855 #endif
 856
 857 void do_irq(int vec, struct pt_regs *fp)
 858 {
 859         if (vec == EVT_IVTMR_P) {
 860                 vec = IRQ_CORETMR;
 861         } else {
 862                 struct ivgx *ivg = ivg7_13[vec - IVG7].ifirst;
 863                 struct ivgx *ivg_stop = ivg7_13[vec - IVG7].istop;
 864 #ifdef CONFIG_BF54x
 865                 unsigned long sic_status[3];
 866
 867                 SSYNC();
 868                 sic_status[0] = bfin_read_SIC_ISR(0) & bfin_read_SIC_IMASK(0);
 869                 sic_status[1] = bfin_read_SIC_ISR(1) & bfin_read_SIC_IMASK(1);
 870                 sic_status[2] = bfin_read_SIC_ISR(2) & bfin_read_SIC_IMASK(2);
 871                 SSYNC();
 872                 for (;; ivg++) {
 873                         if (ivg >= ivg_stop) {
 874                                 atomic_inc(&num_spurious);
 875                                 return;
 876                         }
 877                         if (sic_status[(ivg->irqno - IVG7) / 32] & ivg->isrflag)
 878                                 break;
 879                 }
 880 #else
 881                 unsigned long sic_status;
 882                 SSYNC();
 883                 sic_status = bfin_read_SIC_IMASK() & bfin_read_SIC_ISR();
 884
 885                 for (;; ivg++) {
 886                         if (ivg >= ivg_stop) {
 887                                 atomic_inc(&num_spurious);
 888                                 return;
 889                         } else if (sic_status & ivg->isrflag)
 890                                 break;
 891                 }
 892 #endif
 893                 vec = ivg->irqno;
 894         }
 895         asm_do_IRQ(vec, fp);
 896
 897 #ifdef CONFIG_KGDB
 898         kgdb_process_breakpoint();
 899 #endif
 900 }