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 interupt 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 2004-2006 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         int irqno;
  69         /* corresponding bit in the SIC_ISR register */
  70         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 =
  92                     &ivg_table[irq_pos];
  93
  94                 for (irqn = 0; irqn < NR_PERI_INTS; irqn++) {
  95                         int iar_shift = (irqn & 7) * 4;
  96                         if (ivg ==
  97                             (0xf &
  98                              bfin_read32((unsigned long *) SIC_IAR0 +
  99                                          (irqn >> 3)) >> iar_shift)) {
 100                                 ivg_table[irq_pos].irqno = IVG7 + irqn;
 101                                 ivg_table[irq_pos].isrflag = 1 << irqn;
 102                                 ivg7_13[ivg].istop++;
 103                                 irq_pos++;
 104                         }
 105                 }
 106         }
 107 }
 108
 109 /*
 110  * This is for BF533 internal IRQs
 111  */
 112
 113 static void ack_noop(unsigned int irq)
 114 {
 115         /* Dummy function.  */
 116 }
 117
 118 static void bfin_core_mask_irq(unsigned int irq)
 119 {
 120         irq_flags &= ~(1 << irq);
 121         if (!irqs_disabled())
 122                 local_irq_enable();
 123 }
 124
 125 static void bfin_core_unmask_irq(unsigned int irq)
 126 {
 127         irq_flags |= 1 << irq;
 128         /*
 129          * If interrupts are enabled, IMASK must contain the same value
 130          * as irq_flags.  Make sure that invariant holds.  If interrupts
 131          * are currently disabled we need not do anything; one of the
 132          * callers will take care of setting IMASK to the proper value
 133          * when reenabling interrupts.
 134          * local_irq_enable just does "STI irq_flags", so it's exactly
 135          * what we need.
 136          */
 137         if (!irqs_disabled())
 138                 local_irq_enable();
 139         return;
 140 }
 141
 142 static void bfin_internal_mask_irq(unsigned int irq)
 143 {
 144         bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() &
 145                              ~(1 << (irq - (IRQ_CORETMR + 1))));
 146         SSYNC();
 147 }
 148
 149 static void bfin_internal_unmask_irq(unsigned int irq)
 150 {
 151         bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() |
 152                              (1 << (irq - (IRQ_CORETMR + 1))));
 153         SSYNC();
 154 }
 155
 156 static struct irq_chip bfin_core_irqchip = {
 157         .ack = ack_noop,
 158         .mask = bfin_core_mask_irq,
 159         .unmask = bfin_core_unmask_irq,
 160 };
 161
 162 static struct irq_chip bfin_internal_irqchip = {
 163         .ack = ack_noop,
 164         .mask = bfin_internal_mask_irq,
 165         .unmask = bfin_internal_unmask_irq,
 166 };
 167
 168 #ifdef BF537_GENERIC_ERROR_INT_DEMUX
 169 static int error_int_mask;
 170
 171 static void bfin_generic_error_ack_irq(unsigned int irq)
 172 {
 173
 174 }
 175
 176 static void bfin_generic_error_mask_irq(unsigned int irq)
 177 {
 178         error_int_mask &= ~(1L << (irq - IRQ_PPI_ERROR));
 179
 180         if (!error_int_mask) {
 181                 local_irq_disable();
 182                 bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() &
 183                                      ~(1 <<
 184                                        (IRQ_GENERIC_ERROR -
 185                                         (IRQ_CORETMR + 1))));
 186                 SSYNC();
 187                 local_irq_enable();
 188         }
 189 }
 190
 191 static void bfin_generic_error_unmask_irq(unsigned int irq)
 192 {
 193         local_irq_disable();
 194         bfin_write_SIC_IMASK(bfin_read_SIC_IMASK() | 1 <<
 195                              (IRQ_GENERIC_ERROR - (IRQ_CORETMR + 1)));
 196         SSYNC();
 197         local_irq_enable();
 198
 199         error_int_mask |= 1L << (irq - IRQ_PPI_ERROR);
 200 }
 201
 202 static struct irq_chip bfin_generic_error_irqchip = {
 203         .ack = bfin_generic_error_ack_irq,
 204         .mask = bfin_generic_error_mask_irq,
 205         .unmask = bfin_generic_error_unmask_irq,
 206 };
 207
 208 static void bfin_demux_error_irq(unsigned int int_err_irq,
 209                                   struct irq_desc *intb_desc)
 210 {
 211         int irq = 0;
 212
 213         SSYNC();
 214
 215 #if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
 216         if (bfin_read_EMAC_SYSTAT() & EMAC_ERR_MASK)
 217                 irq = IRQ_MAC_ERROR;
 218         else
 219 #endif
 220         if (bfin_read_SPORT0_STAT() & SPORT_ERR_MASK)
 221                 irq = IRQ_SPORT0_ERROR;
 222         else if (bfin_read_SPORT1_STAT() & SPORT_ERR_MASK)
 223                 irq = IRQ_SPORT1_ERROR;
 224         else if (bfin_read_PPI_STATUS() & PPI_ERR_MASK)
 225                 irq = IRQ_PPI_ERROR;
 226         else if (bfin_read_CAN_GIF() & CAN_ERR_MASK)
 227                 irq = IRQ_CAN_ERROR;
 228         else if (bfin_read_SPI_STAT() & SPI_ERR_MASK)
 229                 irq = IRQ_SPI_ERROR;
 230         else if ((bfin_read_UART0_IIR() & UART_ERR_MASK_STAT1) &&
 231                  (bfin_read_UART0_IIR() & UART_ERR_MASK_STAT0))
 232                 irq = IRQ_UART0_ERROR;
 233         else if ((bfin_read_UART1_IIR() & UART_ERR_MASK_STAT1) &&
 234                  (bfin_read_UART1_IIR() & UART_ERR_MASK_STAT0))
 235                 irq = IRQ_UART1_ERROR;
 236
 237         if (irq) {
 238                 if (error_int_mask & (1L << (irq - IRQ_PPI_ERROR))) {
 239                         struct irq_desc *desc = irq_desc + irq;
 240                         desc->handle_irq(irq, desc);
 241                 } else {
 242
 243                         switch (irq) {
 244                         case IRQ_PPI_ERROR:
 245                                 bfin_write_PPI_STATUS(PPI_ERR_MASK);
 246                                 break;
 247 #if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
 248                         case IRQ_MAC_ERROR:
 249                                 bfin_write_EMAC_SYSTAT(EMAC_ERR_MASK);
 250                                 break;
 251 #endif
 252                         case IRQ_SPORT0_ERROR:
 253                                 bfin_write_SPORT0_STAT(SPORT_ERR_MASK);
 254                                 break;
 255
 256                         case IRQ_SPORT1_ERROR:
 257                                 bfin_write_SPORT1_STAT(SPORT_ERR_MASK);
 258                                 break;
 259
 260                         case IRQ_CAN_ERROR:
 261                                 bfin_write_CAN_GIS(CAN_ERR_MASK);
 262                                 break;
 263
 264                         case IRQ_SPI_ERROR:
 265                                 bfin_write_SPI_STAT(SPI_ERR_MASK);
 266                                 break;
 267
 268                         default:
 269                                 break;
 270                         }
 271
 272                         pr_debug("IRQ %d:"
 273                                 " MASKED PERIPHERAL ERROR INTERRUPT ASSERTED\n",
 274                                 irq);
 275                 }
 276         } else
 277                 printk(KERN_ERR
 278                        "%s : %s : LINE %d :\nIRQ ?: PERIPHERAL ERROR"
 279                        " INTERRUPT ASSERTED BUT NO SOURCE FOUND\n",
 280                        __FUNCTION__, __FILE__, __LINE__);
 281
 282
 283 }
 284 #endif                          /* BF537_GENERIC_ERROR_INT_DEMUX */
 285
 286 #ifdef CONFIG_IRQCHIP_DEMUX_GPIO
 287
 288 static unsigned short gpio_enabled[gpio_bank(MAX_BLACKFIN_GPIOS)];
 289 static unsigned short gpio_edge_triggered[gpio_bank(MAX_BLACKFIN_GPIOS)];
 290
 291 static void bfin_gpio_ack_irq(unsigned int irq)
 292 {
 293         u16 gpionr = irq - IRQ_PF0;
 294
 295         if (gpio_edge_triggered[gpio_bank(gpionr)] & gpio_bit(gpionr)) {
 296                 set_gpio_data(gpionr, 0);
 297                 SSYNC();
 298         }
 299 }
 300
 301 static void bfin_gpio_mask_ack_irq(unsigned int irq)
 302 {
 303         u16 gpionr = irq - IRQ_PF0;
 304
 305         if (gpio_edge_triggered[gpio_bank(gpionr)] & gpio_bit(gpionr)) {
 306                 set_gpio_data(gpionr, 0);
 307                 SSYNC();
 308         }
 309
 310         set_gpio_maska(gpionr, 0);
 311         SSYNC();
 312 }
 313
 314 static void bfin_gpio_mask_irq(unsigned int irq)
 315 {
 316         set_gpio_maska(irq - IRQ_PF0, 0);
 317         SSYNC();
 318 }
 319
 320 static void bfin_gpio_unmask_irq(unsigned int irq)
 321 {
 322         set_gpio_maska(irq - IRQ_PF0, 1);
 323         SSYNC();
 324 }
 325
 326 static unsigned int bfin_gpio_irq_startup(unsigned int irq)
 327 {
 328         unsigned int ret;
 329         u16 gpionr = irq - IRQ_PF0;
 330
 331         if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
 332                 ret = gpio_request(gpionr, NULL);
 333                 if (ret)
 334                         return ret;
 335         }
 336
 337         gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
 338         bfin_gpio_unmask_irq(irq);
 339
 340         return ret;
 341 }
 342
 343 static void bfin_gpio_irq_shutdown(unsigned int irq)
 344 {
 345         bfin_gpio_mask_irq(irq);
 346         gpio_free(irq - IRQ_PF0);
 347         gpio_enabled[gpio_bank(irq - IRQ_PF0)] &= ~gpio_bit(irq - IRQ_PF0);
 348 }
 349
 350 static int bfin_gpio_irq_type(unsigned int irq, unsigned int type)
 351 {
 352
 353         unsigned int ret;
 354         u16 gpionr = irq - IRQ_PF0;
 355
 356         if (type == IRQ_TYPE_PROBE) {
 357                 /* only probe unenabled GPIO interrupt lines */
 358                 if (gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))
 359                         return 0;
 360                 type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 361         }
 362
 363         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING |
 364                     IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
 365         {
 366                 if (!(gpio_enabled[gpio_bank(gpionr)] & gpio_bit(gpionr))) {
 367                         ret = gpio_request(gpionr, NULL);
 368                         if (ret)
 369                                 return ret;
 370                 }
 371
 372                 gpio_enabled[gpio_bank(gpionr)] |= gpio_bit(gpionr);
 373         } else {
 374                 gpio_enabled[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
 375                 return 0;
 376         }
 377
 378         set_gpio_dir(gpionr, 0);
 379         set_gpio_inen(gpionr, 1);
 380
 381         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING)) {
 382                 gpio_edge_triggered[gpio_bank(gpionr)] |= gpio_bit(gpionr);
 383                 set_gpio_edge(gpionr, 1);
 384         } else {
 385                 set_gpio_edge(gpionr, 0);
 386                 gpio_edge_triggered[gpio_bank(gpionr)] &= ~gpio_bit(gpionr);
 387         }
 388
 389         if ((type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 390             == (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 391                 set_gpio_both(gpionr, 1);
 392         else
 393                 set_gpio_both(gpionr, 0);
 394
 395         if ((type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_LEVEL_LOW)))
 396                 set_gpio_polar(gpionr, 1);      /* low or falling edge denoted by one */
 397         else
 398                 set_gpio_polar(gpionr, 0);      /* high or rising edge denoted by zero */
 399
 400         SSYNC();
 401
 402         if (type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING))
 403                 set_irq_handler(irq, handle_edge_irq);
 404         else
 405                 set_irq_handler(irq, handle_level_irq);
 406
 407         return 0;
 408 }
 409
 410
 411 static struct irq_chip bfin_gpio_irqchip = {
 412         .ack = bfin_gpio_ack_irq,
 413         .mask = bfin_gpio_mask_irq,
 414         .mask_ack = bfin_gpio_mask_ack_irq,
 415         .unmask = bfin_gpio_unmask_irq,
 416         .set_type = bfin_gpio_irq_type,
 417         .startup = bfin_gpio_irq_startup,
 418         .shutdown = bfin_gpio_irq_shutdown
 419 };
 420
 421 static void bfin_demux_gpio_irq(unsigned int intb_irq,
 422                                  struct irq_desc *intb_desc)
 423 {
 424         u16 i;
 425
 426         for (i = 0; i < MAX_BLACKFIN_GPIOS; i+=16) {
 427                 int irq = IRQ_PF0 + i;
 428                 int flag_d = get_gpiop_data(i);
 429                 int mask =
 430                         flag_d & (gpio_enabled[gpio_bank(i)] &
 431                               get_gpiop_maska(i));
 432
 433                 while (mask) {
 434                         if (mask & 1) {
 435                                 struct irq_desc *desc = irq_desc + irq;
 436                                 desc->handle_irq(irq, desc);
 437                         }
 438                         irq++;
 439                         mask >>= 1;
 440                 }
 441         }
 442 }
 443
 444 #endif                          /* CONFIG_IRQCHIP_DEMUX_GPIO */
 445
 446 /*
 447  * This function should be called during kernel startup to initialize
 448  * the BFin IRQ handling routines.
 449  */
 450 int __init init_arch_irq(void)
 451 {
 452         int irq;
 453         unsigned long ilat = 0;
 454         /*  Disable all the peripheral intrs  - page 4-29 HW Ref manual */
 455         bfin_write_SIC_IMASK(SIC_UNMASK_ALL);
 456         SSYNC();
 457
 458         local_irq_disable();
 459
 460 #ifndef CONFIG_KGDB
 461         bfin_write_EVT0(evt_emulation);
 462 #endif
 463         bfin_write_EVT2(evt_evt2);
 464         bfin_write_EVT3(trap);
 465         bfin_write_EVT5(evt_ivhw);
 466         bfin_write_EVT6(evt_timer);
 467         bfin_write_EVT7(evt_evt7);
 468         bfin_write_EVT8(evt_evt8);
 469         bfin_write_EVT9(evt_evt9);
 470         bfin_write_EVT10(evt_evt10);
 471         bfin_write_EVT11(evt_evt11);
 472         bfin_write_EVT12(evt_evt12);
 473         bfin_write_EVT13(evt_evt13);
 474         bfin_write_EVT14(evt14_softirq);
 475         bfin_write_EVT15(evt_system_call);
 476         CSYNC();
 477
 478         for (irq = 0; irq < SYS_IRQS; irq++) {
 479                 if (irq <= IRQ_CORETMR)
 480                         set_irq_chip(irq, &bfin_core_irqchip);
 481                 else
 482                         set_irq_chip(irq, &bfin_internal_irqchip);
 483 #ifdef BF537_GENERIC_ERROR_INT_DEMUX
 484                 if (irq != IRQ_GENERIC_ERROR) {
 485 #endif
 486
 487 #ifdef CONFIG_IRQCHIP_DEMUX_GPIO
 488                         if ((irq != IRQ_PROG_INTA) /*PORT F & G MASK_A Interrupt*/
 489 # if defined(BF537_FAMILY) && !(defined(CONFIG_BFIN_MAC) || defined(CONFIG_BFIN_MAC_MODULE))
 490                                 && (irq != IRQ_MAC_RX) /*PORT H MASK_A Interrupt*/
 491 # endif
 492                             ) {
 493 #endif
 494                                 set_irq_handler(irq, handle_simple_irq);
 495 #ifdef CONFIG_IRQCHIP_DEMUX_GPIO
 496                         } else {
 497                                 set_irq_chained_handler(irq,
 498                                                         bfin_demux_gpio_irq);
 499                         }
 500 #endif
 501
 502 #ifdef BF537_GENERIC_ERROR_INT_DEMUX
 503                 } else {
 504                         set_irq_handler(irq, bfin_demux_error_irq);
 505                 }
 506 #endif
 507         }
 508 #ifdef BF537_GENERIC_ERROR_INT_DEMUX
 509         for (irq = IRQ_PPI_ERROR; irq <= IRQ_UART1_ERROR; irq++) {
 510                 set_irq_chip(irq, &bfin_generic_error_irqchip);
 511                 set_irq_handler(irq, handle_level_irq);
 512         }
 513 #endif
 514
 515 #ifdef CONFIG_IRQCHIP_DEMUX_GPIO
 516         for (irq = IRQ_PF0; irq < NR_IRQS; irq++) {
 517                 set_irq_chip(irq, &bfin_gpio_irqchip);
 518                 /* if configured as edge, then will be changed to do_edge_IRQ */
 519                 set_irq_handler(irq, handle_level_irq);
 520         }
 521 #endif
 522         bfin_write_IMASK(0);
 523         CSYNC();
 524         ilat = bfin_read_ILAT();
 525         CSYNC();
 526         bfin_write_ILAT(ilat);
 527         CSYNC();
 528
 529         printk(KERN_INFO
 530                "Configuring Blackfin Priority Driven Interrupts\n");
 531         /* IMASK=xxx is equivalent to STI xx or irq_flags=xx,
 532          * local_irq_enable()
 533          */
 534         program_IAR();
 535         /* Therefore it's better to setup IARs before interrupts enabled */
 536         search_IAR();
 537
 538         /* Enable interrupts IVG7-15 */
 539         irq_flags = irq_flags | IMASK_IVG15 |
 540             IMASK_IVG14 | IMASK_IVG13 | IMASK_IVG12 | IMASK_IVG11 |
 541             IMASK_IVG10 | IMASK_IVG9 | IMASK_IVG8 | IMASK_IVG7 |
 542             IMASK_IVGHW;
 543
 544         return 0;
 545 }
 546
 547 #ifdef CONFIG_DO_IRQ_L1
 548 void do_irq(int vec, struct pt_regs *fp)__attribute__((l1_text));
 549 #endif
 550
 551 void do_irq(int vec, struct pt_regs *fp)
 552 {
 553         if (vec == EVT_IVTMR_P) {
 554                 vec = IRQ_CORETMR;
 555         } else {
 556                 struct ivgx *ivg = ivg7_13[vec - IVG7].ifirst;
 557                 struct ivgx *ivg_stop = ivg7_13[vec - IVG7].istop;
 558                 unsigned long sic_status;
 559
 560                 SSYNC();
 561                 sic_status = bfin_read_SIC_IMASK() & bfin_read_SIC_ISR();
 562
 563                 for (;; ivg++) {
 564                         if (ivg >= ivg_stop) {
 565                                 atomic_inc(&num_spurious);
 566                                 return;
 567                         } else if (sic_status & ivg->isrflag)
 568                                 break;
 569                 }
 570                 vec = ivg->irqno;
 571         }
 572         asm_do_IRQ(vec, fp);
 573
 574 #ifdef CONFIG_KGDB
 575         kgdb_process_breakpoint();
 576 #endif
 577 }