arch/cris/arch-v10/kernel/io_interface_mux.c

   1 /* IO interface mux allocator for ETRAX100LX.
   2  * Copyright 2004, Axis Communications AB
   3  * $Id: io_interface_mux.c,v 1.2 2004/12/21 12:08:38 starvik Exp $
   4  */
   5
   6
   7 /* C.f. ETRAX100LX Designer's Reference 20.9 */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/slab.h>
  11 #include <linux/errno.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14
  15 #include <asm/arch/svinto.h>
  16 #include <asm/io.h>
  17 #include <asm/arch/io_interface_mux.h>
  18
  19
  20 #define DBG(s)
  21
  22 /* Macro to access ETRAX 100 registers */
  23 #define SETS(var, reg, field, val) var = (var & ~IO_MASK_(reg##_, field##_)) | \
  24                                           IO_STATE_(reg##_, field##_, _##val)
  25
  26 enum io_if_group {
  27         group_a = (1<<0),
  28         group_b = (1<<1),
  29         group_c = (1<<2),
  30         group_d = (1<<3),
  31         group_e = (1<<4),
  32         group_f = (1<<5)
  33 };
  34
  35 struct watcher
  36 {
  37         void (*notify)(const unsigned int gpio_in_available,
  38                        const unsigned int gpio_out_available,
  39                        const unsigned char pa_available,
  40                        const unsigned char pb_available);
  41         struct watcher *next;
  42 };
  43
  44
  45 struct if_group
  46 {
  47         enum io_if_group        group;
  48         unsigned char           used;
  49         enum cris_io_interface  owner;
  50 };
  51
  52
  53 struct interface
  54 {
  55         enum cris_io_interface   ioif;
  56         unsigned char            groups;
  57         unsigned char            used;
  58         char                    *owner;
  59         unsigned int             gpio_g_in;
  60         unsigned int             gpio_g_out;
  61         unsigned char            gpio_b;
  62 };
  63
  64 static struct if_group if_groups[6] = {
  65         {
  66                 .group = group_a,
  67                 .used = 0,
  68         },
  69         {
  70                 .group = group_b,
  71                 .used = 0,
  72         },
  73         {
  74                 .group = group_c,
  75                 .used = 0,
  76         },
  77         {
  78                 .group = group_d,
  79                 .used = 0,
  80         },
  81         {
  82                 .group = group_e,
  83                 .used = 0,
  84         },
  85         {
  86                 .group = group_f,
  87                 .used = 0,
  88         }
  89 };
  90
  91 /* The order in the array must match the order of enum
  92  * cris_io_interface in io_interface_mux.h */
  93 static struct interface interfaces[] = {
  94         /* Begin Non-multiplexed interfaces */
  95         {
  96                 .ioif = if_eth,
  97                 .groups = 0,
  98                 .gpio_g_in = 0,
  99                 .gpio_g_out = 0,
 100                 .gpio_b = 0
 101         },
 102         {
 103                 .ioif = if_serial_0,
 104                 .groups = 0,
 105                 .gpio_g_in = 0,
 106                 .gpio_g_out = 0,
 107                 .gpio_b = 0
 108         },
 109         /* End Non-multiplexed interfaces */
 110         {
 111                 .ioif = if_serial_1,
 112                 .groups = group_e,
 113                 .gpio_g_in =  0x00000000,
 114                 .gpio_g_out = 0x00000000,
 115                 .gpio_b = 0x00
 116         },
 117         {
 118                 .ioif = if_serial_2,
 119                 .groups = group_b,
 120                 .gpio_g_in =  0x000000c0,
 121                 .gpio_g_out = 0x000000c0,
 122                 .gpio_b = 0x00
 123         },
 124         {
 125                 .ioif = if_serial_3,
 126                 .groups = group_c,
 127                 .gpio_g_in =  0xc0000000,
 128                 .gpio_g_out = 0xc0000000,
 129                 .gpio_b = 0x00
 130         },
 131         {
 132                 .ioif = if_sync_serial_1,
 133                 .groups = group_e | group_f, /* if_sync_serial_1 and if_sync_serial_3
 134                                                can be used simultaneously */
 135                 .gpio_g_in =  0x00000000,
 136                 .gpio_g_out = 0x00000000,
 137                 .gpio_b = 0x10
 138         },
 139         {
 140                 .ioif = if_sync_serial_3,
 141                 .groups = group_c | group_f,
 142                 .gpio_g_in =  0xc0000000,
 143                 .gpio_g_out = 0xc0000000,
 144                 .gpio_b = 0x80
 145         },
 146         {
 147                 .ioif = if_shared_ram,
 148                 .groups = group_a,
 149                 .gpio_g_in =  0x0000ff3e,
 150                 .gpio_g_out = 0x0000ff38,
 151                 .gpio_b = 0x00
 152         },
 153         {
 154                 .ioif = if_shared_ram_w,
 155                 .groups = group_a | group_d,
 156                 .gpio_g_in =  0x00ffff3e,
 157                 .gpio_g_out = 0x00ffff38,
 158                 .gpio_b = 0x00
 159         },
 160         {
 161                 .ioif = if_par_0,
 162                 .groups = group_a,
 163                 .gpio_g_in =  0x0000ff3e,
 164                 .gpio_g_out = 0x0000ff3e,
 165                 .gpio_b = 0x00
 166         },
 167         {
 168                 .ioif = if_par_1,
 169                 .groups = group_d,
 170                 .gpio_g_in =  0x3eff0000,
 171                 .gpio_g_out = 0x3eff0000,
 172                 .gpio_b = 0x00
 173         },
 174         {
 175                 .ioif = if_par_w,
 176                 .groups = group_a | group_d,
 177                 .gpio_g_in =  0x00ffff3e,
 178                 .gpio_g_out = 0x00ffff3e,
 179                 .gpio_b = 0x00
 180         },
 181         {
 182                 .ioif = if_scsi8_0,
 183                 .groups = group_a | group_b | group_f, /* if_scsi8_0 and if_scsi8_1
 184                                                           can be used simultaneously */
 185                 .gpio_g_in =  0x0000ffff,
 186                 .gpio_g_out = 0x0000ffff,
 187                 .gpio_b = 0x10
 188         },
 189         {
 190                 .ioif = if_scsi8_1,
 191                 .groups = group_c | group_d | group_f, /* if_scsi8_0 and if_scsi8_1
 192                                                           can be used simultaneously */
 193                 .gpio_g_in =  0xffff0000,
 194                 .gpio_g_out = 0xffff0000,
 195                 .gpio_b = 0x80
 196         },
 197         {
 198                 .ioif = if_scsi_w,
 199                 .groups = group_a | group_b | group_d | group_f,
 200                 .gpio_g_in =  0x01ffffff,
 201                 .gpio_g_out = 0x07ffffff,
 202                 .gpio_b = 0x80
 203         },
 204         {
 205                 .ioif = if_ata,
 206                 .groups = group_a | group_b | group_c | group_d,
 207                 .gpio_g_in =  0xf9ffffff,
 208                 .gpio_g_out = 0xffffffff,
 209                 .gpio_b = 0x80
 210         },
 211         {
 212                 .ioif = if_csp,
 213                 .groups = group_f, /* if_csp and if_i2c can be used simultaneously */
 214                 .gpio_g_in =  0x00000000,
 215                 .gpio_g_out = 0x00000000,
 216                 .gpio_b = 0xfc
 217         },
 218         {
 219                 .ioif = if_i2c,
 220                 .groups = group_f, /* if_csp and if_i2c can be used simultaneously */
 221                 .gpio_g_in =  0x00000000,
 222                 .gpio_g_out = 0x00000000,
 223                 .gpio_b = 0x03
 224         },
 225         {
 226                 .ioif = if_usb_1,
 227                 .groups = group_e | group_f,
 228                 .gpio_g_in =  0x00000000,
 229                 .gpio_g_out = 0x00000000,
 230                 .gpio_b = 0x2c
 231         },
 232         {
 233                 .ioif = if_usb_2,
 234                 .groups = group_d,
 235                 .gpio_g_in =  0x0e000000,
 236                 .gpio_g_out = 0x3c000000,
 237                 .gpio_b = 0x00
 238         },
 239         /* GPIO pins */
 240         {
 241                 .ioif = if_gpio_grp_a,
 242                 .groups = group_a,
 243                 .gpio_g_in =  0x0000ff3f,
 244                 .gpio_g_out = 0x0000ff3f,
 245                 .gpio_b = 0x00
 246         },
 247         {
 248                 .ioif = if_gpio_grp_b,
 249                 .groups = group_b,
 250                 .gpio_g_in =  0x000000c0,
 251                 .gpio_g_out = 0x000000c0,
 252                 .gpio_b = 0x00
 253         },
 254         {
 255                 .ioif = if_gpio_grp_c,
 256                 .groups = group_c,
 257                 .gpio_g_in =  0xc0000000,
 258                 .gpio_g_out = 0xc0000000,
 259                 .gpio_b = 0x00
 260         },
 261         {
 262                 .ioif = if_gpio_grp_d,
 263                 .groups = group_d,
 264                 .gpio_g_in =  0x3fff0000,
 265                 .gpio_g_out = 0x3fff0000,
 266                 .gpio_b = 0x00
 267         },
 268         {
 269                 .ioif = if_gpio_grp_e,
 270                 .groups = group_e,
 271                 .gpio_g_in =  0x00000000,
 272                 .gpio_g_out = 0x00000000,
 273                 .gpio_b = 0x00
 274         },
 275         {
 276                 .ioif = if_gpio_grp_f,
 277                 .groups = group_f,
 278                 .gpio_g_in =  0x00000000,
 279                 .gpio_g_out = 0x00000000,
 280                 .gpio_b = 0xff
 281         }
 282         /* Array end */
 283 };
 284
 285 static struct watcher *watchers = NULL;
 286
 287 static unsigned int gpio_in_pins =  0xffffffff;
 288 static unsigned int gpio_out_pins = 0xffffffff;
 289 static unsigned char gpio_pb_pins = 0xff;
 290 static unsigned char gpio_pa_pins = 0xff;
 291
 292 static enum cris_io_interface gpio_pa_owners[8];
 293 static enum cris_io_interface gpio_pb_owners[8];
 294 static enum cris_io_interface gpio_pg_owners[32];
 295
 296 static int cris_io_interface_init(void);
 297
 298 static unsigned char clear_group_from_set(const unsigned char groups, struct if_group *group)
 299 {
 300         return (groups & ~group->group);
 301 }
 302
 303
 304 static struct if_group *get_group(const unsigned char groups)
 305 {
 306         int i;
 307         for (i = 0; i < sizeof(if_groups)/sizeof(struct if_group); i++) {
 308                 if (groups & if_groups[i].group) {
 309                         return &if_groups[i];
 310                 }
 311         }
 312         return NULL;
 313 }
 314
 315
 316 static void notify_watchers(void)
 317 {
 318         struct watcher *w = watchers;
 319
 320         DBG(printk("io_interface_mux: notifying watchers\n"));
 321
 322         while (NULL != w) {
 323                 w->notify((const unsigned int)gpio_in_pins,
 324                           (const unsigned int)gpio_out_pins,
 325                           (const unsigned char)gpio_pa_pins,
 326                           (const unsigned char)gpio_pb_pins);
 327                 w = w->next;
 328         }
 329 }
 330
 331
 332 int cris_request_io_interface(enum cris_io_interface ioif, const char *device_id)
 333 {
 334         int set_gen_config = 0;
 335         int set_gen_config_ii = 0;
 336         unsigned long int gens;
 337         unsigned long int gens_ii;
 338         struct if_group *grp;
 339         unsigned char group_set;
 340         unsigned long flags;
 341
 342         (void)cris_io_interface_init();
 343
 344         DBG(printk("cris_request_io_interface(%d, \"%s\")\n", ioif, device_id));
 345
 346         if ((ioif >= if_max_interfaces) || (ioif < 0)) {
 347                 printk(KERN_CRIT "cris_request_io_interface: Bad interface %u submitted for %s\n",
 348                        ioif,
 349                        device_id);
 350                 return -EINVAL;
 351         }
 352
 353         local_irq_save(flags);
 354
 355         if (interfaces[ioif].used) {
 356                 local_irq_restore(flags);
 357                 printk(KERN_CRIT "cris_io_interface: Cannot allocate interface for %s, in use by %s\n",
 358                        device_id,
 359                        interfaces[ioif].owner);
 360                 return -EBUSY;
 361         }
 362
 363         /* Check that all required groups are free before allocating, */
 364         group_set = interfaces[ioif].groups;
 365         while (NULL != (grp = get_group(group_set))) {
 366                 if (grp->used) {
 367                         if (grp->group == group_f) {
 368                                 if ((if_sync_serial_1 ==  ioif) ||
 369                                     (if_sync_serial_3 ==  ioif)) {
 370                                         if ((grp->owner != if_sync_serial_1) &&
 371                                             (grp->owner != if_sync_serial_3)) {
 372                                                 local_irq_restore(flags);
 373                                                 return -EBUSY;
 374                                         }
 375                                 } else if ((if_scsi8_0 == ioif) ||
 376                                            (if_scsi8_1 == ioif)) {
 377                                         if ((grp->owner != if_scsi8_0) &&
 378                                             (grp->owner != if_scsi8_1)) {
 379                                                 local_irq_restore(flags);
 380                                                 return -EBUSY;
 381                                         }
 382                                 }
 383                         } else {
 384                                 local_irq_restore(flags);
 385                                 return -EBUSY;
 386                         }
 387                 }
 388                 group_set = clear_group_from_set(group_set, grp);
 389         }
 390
 391         /* Are the required GPIO pins available too? */
 392         if (((interfaces[ioif].gpio_g_in & gpio_in_pins) != interfaces[ioif].gpio_g_in) ||
 393             ((interfaces[ioif].gpio_g_out & gpio_out_pins) != interfaces[ioif].gpio_g_out) ||
 394             ((interfaces[ioif].gpio_b & gpio_pb_pins) != interfaces[ioif].gpio_b)) {
 395                 printk(KERN_CRIT "cris_request_io_interface: Could not get required pins for interface %u\n",
 396                        ioif);
 397                 return -EBUSY;
 398         }
 399
 400         /* All needed I/O pins and pin groups are free, allocate. */
 401         group_set = interfaces[ioif].groups;
 402         while (NULL != (grp = get_group(group_set))) {
 403                 grp->used = 1;
 404                 grp->owner = ioif;
 405                 group_set = clear_group_from_set(group_set, grp);
 406         }
 407
 408         gens = genconfig_shadow;
 409         gens_ii = gen_config_ii_shadow;
 410
 411         set_gen_config = 1;
 412         switch (ioif)
 413         {
 414         /* Begin Non-multiplexed interfaces */
 415         case if_eth:
 416                 /* fall through */
 417         case if_serial_0:
 418                 set_gen_config = 0;
 419                 break;
 420         /* End Non-multiplexed interfaces */
 421         case if_serial_1:
 422                 set_gen_config_ii = 1;
 423                 SETS(gens_ii, R_GEN_CONFIG_II, sermode1, async);
 424                 break;
 425         case if_serial_2:
 426                 SETS(gens, R_GEN_CONFIG, ser2, select);
 427                 break;
 428         case if_serial_3:
 429                 SETS(gens, R_GEN_CONFIG, ser3, select);
 430                 set_gen_config_ii = 1;
 431                 SETS(gens_ii, R_GEN_CONFIG_II, sermode3, async);
 432                 break;
 433         case if_sync_serial_1:
 434                 set_gen_config_ii = 1;
 435                 SETS(gens_ii, R_GEN_CONFIG_II, sermode1, sync);
 436                 break;
 437         case if_sync_serial_3:
 438                 SETS(gens, R_GEN_CONFIG, ser3, select);
 439                 set_gen_config_ii = 1;
 440                 SETS(gens_ii, R_GEN_CONFIG_II, sermode3, sync);
 441                 break;
 442         case if_shared_ram:
 443                 SETS(gens, R_GEN_CONFIG, mio, select);
 444                 break;
 445         case if_shared_ram_w:
 446                 SETS(gens, R_GEN_CONFIG, mio_w, select);
 447                 break;
 448         case if_par_0:
 449                 SETS(gens, R_GEN_CONFIG, par0, select);
 450                 break;
 451         case if_par_1:
 452                 SETS(gens, R_GEN_CONFIG, par1, select);
 453                 break;
 454         case if_par_w:
 455                 SETS(gens, R_GEN_CONFIG, par0, select);
 456                 SETS(gens, R_GEN_CONFIG, par_w, select);
 457                 break;
 458         case if_scsi8_0:
 459                 SETS(gens, R_GEN_CONFIG, scsi0, select);
 460                 break;
 461         case if_scsi8_1:
 462                 SETS(gens, R_GEN_CONFIG, scsi1, select);
 463                 break;
 464         case if_scsi_w:
 465                 SETS(gens, R_GEN_CONFIG, scsi0, select);
 466                 SETS(gens, R_GEN_CONFIG, scsi0w, select);
 467                 break;
 468         case if_ata:
 469                 SETS(gens, R_GEN_CONFIG, ata, select);
 470                 break;
 471         case if_csp:
 472                 /* fall through */
 473         case if_i2c:
 474                 set_gen_config = 0;
 475                 break;
 476         case if_usb_1:
 477                 SETS(gens, R_GEN_CONFIG, usb1, select);
 478                 break;
 479         case if_usb_2:
 480                 SETS(gens, R_GEN_CONFIG, usb2, select);
 481                 break;
 482         case if_gpio_grp_a:
 483                 /* GPIO groups are only accounted, don't do configuration changes. */
 484                 /* fall through */
 485         case if_gpio_grp_b:
 486                 /* fall through */
 487         case if_gpio_grp_c:
 488                 /* fall through */
 489         case if_gpio_grp_d:
 490                 /* fall through */
 491         case if_gpio_grp_e:
 492                 /* fall through */
 493         case if_gpio_grp_f:
 494                 set_gen_config = 0;
 495                 break;
 496         default:
 497                 panic("cris_request_io_interface: Bad interface %u submitted for %s\n",
 498                       ioif,
 499                       device_id);
 500         }
 501
 502         interfaces[ioif].used = 1;
 503         interfaces[ioif].owner = (char*)device_id;
 504
 505         if (set_gen_config) {
 506                 volatile int i;
 507                 genconfig_shadow = gens;
 508                 *R_GEN_CONFIG = genconfig_shadow;
 509                 /* Wait 12 cycles before doing any DMA command */
 510                 for(i = 6; i > 0; i--)
 511                         nop();
 512         }
 513         if (set_gen_config_ii) {
 514                 gen_config_ii_shadow = gens_ii;
 515                 *R_GEN_CONFIG_II = gen_config_ii_shadow;
 516         }
 517
 518         DBG(printk("GPIO pins: available before: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
 519                    gpio_in_pins, gpio_out_pins, gpio_pb_pins));
 520         DBG(printk("grabbing pins: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
 521                    interfaces[ioif].gpio_g_in,
 522                    interfaces[ioif].gpio_g_out,
 523                    interfaces[ioif].gpio_b));
 524
 525         gpio_in_pins &= ~interfaces[ioif].gpio_g_in;
 526         gpio_out_pins &= ~interfaces[ioif].gpio_g_out;
 527         gpio_pb_pins &= ~interfaces[ioif].gpio_b;
 528
 529         DBG(printk("GPIO pins: available after: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
 530                    gpio_in_pins, gpio_out_pins, gpio_pb_pins));
 531
 532         local_irq_restore(flags);
 533
 534         notify_watchers();
 535
 536         return 0;
 537 }
 538
 539
 540 void cris_free_io_interface(enum cris_io_interface ioif)
 541 {
 542         struct if_group *grp;
 543         unsigned char group_set;
 544         unsigned long flags;
 545
 546         (void)cris_io_interface_init();
 547
 548         if ((ioif >= if_max_interfaces) || (ioif < 0)) {
 549                 printk(KERN_CRIT "cris_free_io_interface: Bad interface %u\n",
 550                        ioif);
 551                 return;
 552         }
 553         local_irq_save(flags);
 554         if (!interfaces[ioif].used) {
 555                 printk(KERN_CRIT "cris_free_io_interface: Freeing free interface %u\n",
 556                        ioif);
 557                 local_irq_restore(flags);
 558                 return;
 559         }
 560         group_set = interfaces[ioif].groups;
 561         while (NULL != (grp = get_group(group_set))) {
 562                 if (grp->group == group_f) {
 563                         switch (ioif)
 564                         {
 565                         case if_sync_serial_1:
 566                                 if ((grp->owner == if_sync_serial_1) &&
 567                                     interfaces[if_sync_serial_3].used) {
 568                                         grp->owner = if_sync_serial_3;
 569                                 } else
 570                                         grp->used = 0;
 571                                 break;
 572                         case if_sync_serial_3:
 573                                 if ((grp->owner == if_sync_serial_3) &&
 574                                     interfaces[if_sync_serial_1].used) {
 575                                         grp->owner = if_sync_serial_1;
 576                                 } else
 577                                         grp->used = 0;
 578                                 break;
 579                         case if_scsi8_0:
 580                                 if ((grp->owner == if_scsi8_0) &&
 581                                     interfaces[if_scsi8_1].used) {
 582                                         grp->owner = if_scsi8_1;
 583                                 } else
 584                                         grp->used = 0;
 585                                 break;
 586                         case if_scsi8_1:
 587                                 if ((grp->owner == if_scsi8_1) &&
 588                                     interfaces[if_scsi8_0].used) {
 589                                         grp->owner = if_scsi8_0;
 590                                 } else
 591                                         grp->used = 0;
 592                                 break;
 593                         default:
 594                                 grp->used = 0;
 595                         }
 596                 } else {
 597                         grp->used = 0;
 598                 }
 599                 group_set = clear_group_from_set(group_set, grp);
 600         }
 601         interfaces[ioif].used = 0;
 602         interfaces[ioif].owner = NULL;
 603
 604         DBG(printk("GPIO pins: available before: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
 605                    gpio_in_pins, gpio_out_pins, gpio_pb_pins));
 606         DBG(printk("freeing pins: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
 607                    interfaces[ioif].gpio_g_in,
 608                    interfaces[ioif].gpio_g_out,
 609                    interfaces[ioif].gpio_b));
 610
 611         gpio_in_pins |= interfaces[ioif].gpio_g_in;
 612         gpio_out_pins |= interfaces[ioif].gpio_g_out;
 613         gpio_pb_pins |= interfaces[ioif].gpio_b;
 614
 615         DBG(printk("GPIO pins: available after: g_in=0x%08x g_out=0x%08x pb=0x%02x\n",
 616                    gpio_in_pins, gpio_out_pins, gpio_pb_pins));
 617
 618         local_irq_restore(flags);
 619
 620         notify_watchers();
 621 }
 622
 623 /* Create a bitmask from bit 0 (inclusive) to bit stop_bit
 624    (non-inclusive).  stop_bit == 0 returns 0x0 */
 625 static inline unsigned int create_mask(const unsigned stop_bit)
 626 {
 627         /* Avoid overflow */
 628         if (stop_bit >= 32) {
 629                 return 0xffffffff;
 630         }
 631         return (1<<stop_bit)-1;
 632 }
 633
 634
 635 /* port can be 'a', 'b' or 'g' */
 636 int cris_io_interface_allocate_pins(const enum cris_io_interface ioif,
 637                                     const char port,
 638                                     const unsigned start_bit,
 639                                     const unsigned stop_bit)
 640 {
 641         unsigned int i;
 642         unsigned int mask = 0;
 643         unsigned int tmp_mask;
 644         unsigned long int flags;
 645         enum cris_io_interface *owners;
 646
 647         (void)cris_io_interface_init();
 648
 649         DBG(printk("cris_io_interface_allocate_pins: if=%d port=%c start=%u stop=%u\n",
 650                    ioif, port, start_bit, stop_bit));
 651
 652         if (!((start_bit <= stop_bit) &&
 653               ((((port == 'a') || (port == 'b')) && (stop_bit < 8)) ||
 654                ((port == 'g') && (stop_bit < 32))))) {
 655                 return -EINVAL;
 656         }
 657
 658         mask = create_mask(stop_bit + 1);
 659         tmp_mask = create_mask(start_bit);
 660         mask &= ~tmp_mask;
 661
 662         DBG(printk("cris_io_interface_allocate_pins: port=%c start=%u stop=%u mask=0x%08x\n",
 663                    port, start_bit, stop_bit, mask));
 664
 665         local_irq_save(flags);
 666
 667         switch (port) {
 668         case 'a':
 669                 if ((gpio_pa_pins & mask) != mask) {
 670                         local_irq_restore(flags);
 671                         return -EBUSY;
 672                 }
 673                 owners = gpio_pa_owners;
 674                 gpio_pa_pins &= ~mask;
 675                 break;
 676         case 'b':
 677                 if ((gpio_pb_pins & mask) != mask) {
 678                         local_irq_restore(flags);
 679                         return -EBUSY;
 680                 }
 681                 owners = gpio_pb_owners;
 682                 gpio_pb_pins &= ~mask;
 683                 break;
 684         case 'g':
 685                 if (((gpio_in_pins & mask) != mask) ||
 686                     ((gpio_out_pins & mask) != mask)) {
 687                         local_irq_restore(flags);
 688                         return -EBUSY;
 689                 }
 690                 owners = gpio_pg_owners;
 691                 gpio_in_pins &= ~mask;
 692                 gpio_out_pins &= ~mask;
 693                 break;
 694         default:
 695                 local_irq_restore(flags);
 696                 return -EINVAL;
 697         }
 698
 699         for (i = start_bit; i <= stop_bit; i++) {
 700                 owners[i] = ioif;
 701         }
 702         local_irq_restore(flags);
 703
 704         notify_watchers();
 705         return 0;
 706 }
 707
 708
 709 /* port can be 'a', 'b' or 'g' */
 710 int cris_io_interface_free_pins(const enum cris_io_interface ioif,
 711                                 const char port,
 712                                 const unsigned start_bit,
 713                                 const unsigned stop_bit)
 714 {
 715         unsigned int i;
 716         unsigned int mask = 0;
 717         unsigned int tmp_mask;
 718         unsigned long int flags;
 719         enum cris_io_interface *owners;
 720
 721         (void)cris_io_interface_init();
 722
 723         if (!((start_bit <= stop_bit) &&
 724               ((((port == 'a') || (port == 'b')) && (stop_bit < 8)) ||
 725                ((port == 'g') && (stop_bit < 32))))) {
 726                 return -EINVAL;
 727         }
 728
 729         mask = create_mask(stop_bit + 1);
 730         tmp_mask = create_mask(start_bit);
 731         mask &= ~tmp_mask;
 732
 733         DBG(printk("cris_io_interface_free_pins: port=%c start=%u stop=%u mask=0x%08x\n",
 734                    port, start_bit, stop_bit, mask));
 735
 736         local_irq_save(flags);
 737
 738         switch (port) {
 739         case 'a':
 740                 if ((~gpio_pa_pins & mask) != mask) {
 741                         local_irq_restore(flags);
 742                         printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
 743                 }
 744                 owners = gpio_pa_owners;
 745                 break;
 746         case 'b':
 747                 if ((~gpio_pb_pins & mask) != mask) {
 748                         local_irq_restore(flags);
 749                         printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
 750                 }
 751                 owners = gpio_pb_owners;
 752                 break;
 753         case 'g':
 754                 if (((~gpio_in_pins & mask) != mask) ||
 755                     ((~gpio_out_pins & mask) != mask)) {
 756                         local_irq_restore(flags);
 757                         printk(KERN_CRIT "cris_io_interface_free_pins: Freeing free pins");
 758                 }
 759                 owners = gpio_pg_owners;
 760                 break;
 761         default:
 762                 owners = NULL; /* Cannot happen. Shut up, gcc! */
 763         }
 764
 765         for (i = start_bit; i <= stop_bit; i++) {
 766                 if (owners[i] != ioif) {
 767                         printk(KERN_CRIT "cris_io_interface_free_pins: Freeing unowned pins");
 768                 }
 769         }
 770
 771         /* All was ok, change data. */
 772         switch (port) {
 773         case 'a':
 774                 gpio_pa_pins |= mask;
 775                 break;
 776         case 'b':
 777                 gpio_pb_pins |= mask;
 778                 break;
 779         case 'g':
 780                 gpio_in_pins |= mask;
 781                 gpio_out_pins |= mask;
 782                 break;
 783         }
 784
 785         for (i = start_bit; i <= stop_bit; i++) {
 786                 owners[i] = if_unclaimed;
 787         }
 788         local_irq_restore(flags);
 789         notify_watchers();
 790
 791         return 0;
 792 }
 793
 794
 795 int cris_io_interface_register_watcher(void (*notify)(const unsigned int gpio_in_available,
 796                                                       const unsigned int gpio_out_available,
 797                                                       const unsigned char pa_available,
 798                                                       const unsigned char pb_available))
 799 {
 800         struct watcher *w;
 801
 802         (void)cris_io_interface_init();
 803
 804         if (NULL == notify) {
 805                 return -EINVAL;
 806         }
 807         w = kmalloc(sizeof(*w), GFP_KERNEL);
 808         if (!w) {
 809                 return -ENOMEM;
 810         }
 811         w->notify = notify;
 812         w->next = watchers;
 813         watchers = w;
 814
 815         w->notify((const unsigned int)gpio_in_pins,
 816                   (const unsigned int)gpio_out_pins,
 817                   (const unsigned char)gpio_pa_pins,
 818                   (const unsigned char)gpio_pb_pins);
 819
 820         return 0;
 821 }
 822
 823 void cris_io_interface_delete_watcher(void (*notify)(const unsigned int gpio_in_available,
 824                                                      const unsigned int gpio_out_available,
 825                                                      const unsigned char pa_available,
 826                                                      const unsigned char pb_available))
 827 {
 828         struct watcher *w = watchers, *prev = NULL;
 829
 830         (void)cris_io_interface_init();
 831
 832         while ((NULL != w) && (w->notify != notify)){
 833                 prev = w;
 834                 w = w->next;
 835         }
 836         if (NULL != w) {
 837                 if (NULL != prev) {
 838                         prev->next = w->next;
 839                 } else {
 840                         watchers = w->next;
 841                 }
 842                 kfree(w);
 843                 return;
 844         }
 845         printk(KERN_WARNING "cris_io_interface_delete_watcher: Deleting unknown watcher 0x%p\n", notify);
 846 }
 847
 848
 849 static int cris_io_interface_init(void)
 850 {
 851         static int first = 1;
 852         int i;
 853
 854         if (!first) {
 855                 return 0;
 856         }
 857         first = 0;
 858
 859         for (i = 0; i<8; i++) {
 860                 gpio_pa_owners[i] = if_unclaimed;
 861                 gpio_pb_owners[i] = if_unclaimed;
 862                 gpio_pg_owners[i] = if_unclaimed;
 863         }
 864         for (; i<32; i++) {
 865                 gpio_pg_owners[i] = if_unclaimed;
 866         }
 867         return 0;
 868 }
 869
 870
 871 module_init(cris_io_interface_init);
 872
 873
 874 EXPORT_SYMBOL(cris_request_io_interface);
 875 EXPORT_SYMBOL(cris_free_io_interface);
 876 EXPORT_SYMBOL(cris_io_interface_allocate_pins);
 877 EXPORT_SYMBOL(cris_io_interface_free_pins);
 878 EXPORT_SYMBOL(cris_io_interface_register_watcher);
 879 EXPORT_SYMBOL(cris_io_interface_delete_watcher);