arch/blackfin/cpu/gpio.c

   1 /*
   2  * ADI GPIO1 Abstraction Layer
   3  * Support BF50x, BF51x, BF52x, BF53x and BF561 only.
   4  *
   5  * Copyright 2006-2010 Analog Devices Inc.
   6  *
   7  * Licensed under the GPL-2 or later
   8  */
   9
  10 #include <common.h>
  11 #include <asm/errno.h>
  12 #include <asm/gpio.h>
  13 #include <asm/portmux.h>
  14
  15 #if ANOMALY_05000311 || ANOMALY_05000323
  16 enum {
  17         AWA_data = SYSCR,
  18         AWA_data_clear = SYSCR,
  19         AWA_data_set = SYSCR,
  20         AWA_toggle = SYSCR,
  21         AWA_maska = UART_SCR,
  22         AWA_maska_clear = UART_SCR,
  23         AWA_maska_set = UART_SCR,
  24         AWA_maska_toggle = UART_SCR,
  25         AWA_maskb = UART_GCTL,
  26         AWA_maskb_clear = UART_GCTL,
  27         AWA_maskb_set = UART_GCTL,
  28         AWA_maskb_toggle = UART_GCTL,
  29         AWA_dir = SPORT1_STAT,
  30         AWA_polar = SPORT1_STAT,
  31         AWA_edge = SPORT1_STAT,
  32         AWA_both = SPORT1_STAT,
  33 #if ANOMALY_05000311
  34         AWA_inen = TIMER_ENABLE,
  35 #elif ANOMALY_05000323
  36         AWA_inen = DMA1_1_CONFIG,
  37 #endif
  38 };
  39         /* Anomaly Workaround */
  40 #define AWA_DUMMY_READ(name) bfin_read16(AWA_ ## name)
  41 #else
  42 #define AWA_DUMMY_READ(...)  do { } while (0)
  43 #endif
  44
  45 static struct gpio_port_t * const gpio_array[] = {
  46 #if defined(BF533_FAMILY)
  47         (struct gpio_port_t *) FIO_FLAG_D,
  48 #elif defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x) \
  49         || defined(BF538_FAMILY) || defined(CONFIG_BF50x)
  50         (struct gpio_port_t *) PORTFIO,
  51 # if !defined(BF538_FAMILY)
  52         (struct gpio_port_t *) PORTGIO,
  53         (struct gpio_port_t *) PORTHIO,
  54 # endif
  55 #elif defined(BF561_FAMILY)
  56         (struct gpio_port_t *) FIO0_FLAG_D,
  57         (struct gpio_port_t *) FIO1_FLAG_D,
  58         (struct gpio_port_t *) FIO2_FLAG_D,
  59 #else
  60 # error no gpio arrays defined
  61 #endif
  62 };
  63
  64 #if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x) || \
  65     defined(CONFIG_BF50x)
  66 static unsigned short * const port_fer[] = {
  67         (unsigned short *) PORTF_FER,
  68         (unsigned short *) PORTG_FER,
  69         (unsigned short *) PORTH_FER,
  70 };
  71
  72 # if !defined(BF537_FAMILY)
  73 static unsigned short * const port_mux[] = {
  74         (unsigned short *) PORTF_MUX,
  75         (unsigned short *) PORTG_MUX,
  76         (unsigned short *) PORTH_MUX,
  77 };
  78
  79 static const
  80 u8 pmux_offset[][16] = {
  81 #  if defined(CONFIG_BF52x)
  82         { 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 4, 6, 8, 8, 10, 10 }, /* PORTF */
  83         { 0, 0, 0, 0, 0, 2, 2, 4, 4, 6, 8, 10, 10, 10, 12, 12 }, /* PORTG */
  84         { 0, 0, 0, 0, 0, 0, 0, 0, 2, 4, 4, 4, 4, 4, 4, 4 }, /* PORTH */
  85 #  elif defined(CONFIG_BF51x)
  86         { 0, 2, 2, 2, 2, 2, 2, 4, 6, 6, 6, 8, 8, 8, 8, 10 }, /* PORTF */
  87         { 0, 0, 0, 2, 4, 6, 6, 6, 8, 10, 10, 12, 14, 14, 14, 14 }, /* PORTG */
  88         { 0, 0, 0, 0, 2, 2, 4, 6, 10, 10, 10, 10, 10, 10, 10, 10 }, /* PORTH */
  89 #  endif
  90 };
  91 # endif
  92
  93 #elif defined(BF538_FAMILY)
  94 static unsigned short * const port_fer[] = {
  95         (unsigned short *) PORTCIO_FER,
  96         (unsigned short *) PORTDIO_FER,
  97         (unsigned short *) PORTEIO_FER,
  98 };
  99 #endif
 100
 101 #ifdef CONFIG_BFIN_GPIO_TRACK
 102 #define RESOURCE_LABEL_SIZE     16
 103
 104 static struct str_ident {
 105         char name[RESOURCE_LABEL_SIZE];
 106 } str_ident[MAX_RESOURCES];
 107
 108 static void gpio_error(unsigned gpio)
 109 {
 110         printf("bfin-gpio: GPIO %d wasn't requested!\n", gpio);
 111 }
 112
 113 static void set_label(unsigned short ident, const char *label)
 114 {
 115         if (label) {
 116                 strncpy(str_ident[ident].name, label,
 117                          RESOURCE_LABEL_SIZE);
 118                 str_ident[ident].name[RESOURCE_LABEL_SIZE - 1] = 0;
 119         }
 120 }
 121
 122 static char *get_label(unsigned short ident)
 123 {
 124         return (*str_ident[ident].name ? str_ident[ident].name : "UNKNOWN");
 125 }
 126
 127 static int cmp_label(unsigned short ident, const char *label)
 128 {
 129         if (label == NULL)
 130                 printf("bfin-gpio: please provide none-null label\n");
 131
 132         if (label)
 133                 return strcmp(str_ident[ident].name, label);
 134         else
 135                 return -EINVAL;
 136 }
 137
 138 #define map_entry(m, i)      reserved_##m##_map[gpio_bank(i)]
 139 #define is_reserved(m, i, e) (map_entry(m, i) & gpio_bit(i))
 140 #define reserve(m, i)        (map_entry(m, i) |= gpio_bit(i))
 141 #define unreserve(m, i)      (map_entry(m, i) &= ~gpio_bit(i))
 142 #define DECLARE_RESERVED_MAP(m, c) static unsigned short reserved_##m##_map[c]
 143 #else
 144 #define is_reserved(m, i, e) (!(e))
 145 #define reserve(m, i)
 146 #define unreserve(m, i)
 147 #define DECLARE_RESERVED_MAP(m, c)
 148 #define gpio_error(gpio)
 149 #define set_label(...)
 150 #define get_label(...) ""
 151 #define cmp_label(...) 1
 152 #endif
 153
 154 DECLARE_RESERVED_MAP(gpio, GPIO_BANK_NUM);
 155 DECLARE_RESERVED_MAP(peri, gpio_bank(MAX_RESOURCES));
 156
 157 inline int check_gpio(unsigned gpio)
 158 {
 159         if (gpio >= MAX_BLACKFIN_GPIOS)
 160                 return -EINVAL;
 161         return 0;
 162 }
 163
 164 static void port_setup(unsigned gpio, unsigned short usage)
 165 {
 166 #if defined(BF538_FAMILY)
 167         /*
 168          * BF538/9 Port C,D and E are special.
 169          * Inverted PORT_FER polarity on CDE and no PORF_FER on F
 170          * Regular PORT F GPIOs are handled here, CDE are exclusively
 171          * managed by GPIOLIB
 172          */
 173
 174         if (gpio < MAX_BLACKFIN_GPIOS || gpio >= MAX_RESOURCES)
 175                 return;
 176
 177         gpio -= MAX_BLACKFIN_GPIOS;
 178
 179         if (usage == GPIO_USAGE)
 180                 *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
 181         else
 182                 *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
 183         SSYNC();
 184         return;
 185 #endif
 186
 187         if (check_gpio(gpio))
 188                 return;
 189
 190 #if defined(CONFIG_BF52x) || defined(BF537_FAMILY) || defined(CONFIG_BF51x) || \
 191     defined(CONFIG_BF50x)
 192         if (usage == GPIO_USAGE)
 193                 *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
 194         else
 195                 *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
 196         SSYNC();
 197 #endif
 198 }
 199
 200 #ifdef BF537_FAMILY
 201 static struct {
 202         unsigned short res;
 203         unsigned short offset;
 204 } port_mux_lut[] = {
 205         {.res = P_PPI0_D13, .offset = 11},
 206         {.res = P_PPI0_D14, .offset = 11},
 207         {.res = P_PPI0_D15, .offset = 11},
 208         {.res = P_SPORT1_TFS, .offset = 11},
 209         {.res = P_SPORT1_TSCLK, .offset = 11},
 210         {.res = P_SPORT1_DTPRI, .offset = 11},
 211         {.res = P_PPI0_D10, .offset = 10},
 212         {.res = P_PPI0_D11, .offset = 10},
 213         {.res = P_PPI0_D12, .offset = 10},
 214         {.res = P_SPORT1_RSCLK, .offset = 10},
 215         {.res = P_SPORT1_RFS, .offset = 10},
 216         {.res = P_SPORT1_DRPRI, .offset = 10},
 217         {.res = P_PPI0_D8, .offset = 9},
 218         {.res = P_PPI0_D9, .offset = 9},
 219         {.res = P_SPORT1_DRSEC, .offset = 9},
 220         {.res = P_SPORT1_DTSEC, .offset = 9},
 221         {.res = P_TMR2, .offset = 8},
 222         {.res = P_PPI0_FS3, .offset = 8},
 223         {.res = P_TMR3, .offset = 7},
 224         {.res = P_SPI0_SSEL4, .offset = 7},
 225         {.res = P_TMR4, .offset = 6},
 226         {.res = P_SPI0_SSEL5, .offset = 6},
 227         {.res = P_TMR5, .offset = 5},
 228         {.res = P_SPI0_SSEL6, .offset = 5},
 229         {.res = P_UART1_RX, .offset = 4},
 230         {.res = P_UART1_TX, .offset = 4},
 231         {.res = P_TMR6, .offset = 4},
 232         {.res = P_TMR7, .offset = 4},
 233         {.res = P_UART0_RX, .offset = 3},
 234         {.res = P_UART0_TX, .offset = 3},
 235         {.res = P_DMAR0, .offset = 3},
 236         {.res = P_DMAR1, .offset = 3},
 237         {.res = P_SPORT0_DTSEC, .offset = 1},
 238         {.res = P_SPORT0_DRSEC, .offset = 1},
 239         {.res = P_CAN0_RX, .offset = 1},
 240         {.res = P_CAN0_TX, .offset = 1},
 241         {.res = P_SPI0_SSEL7, .offset = 1},
 242         {.res = P_SPORT0_TFS, .offset = 0},
 243         {.res = P_SPORT0_DTPRI, .offset = 0},
 244         {.res = P_SPI0_SSEL2, .offset = 0},
 245         {.res = P_SPI0_SSEL3, .offset = 0},
 246 };
 247
 248 static void portmux_setup(unsigned short per)
 249 {
 250         u16 y, offset, muxreg;
 251         u16 function = P_FUNCT2MUX(per);
 252
 253         for (y = 0; y < ARRAY_SIZE(port_mux_lut); y++) {
 254                 if (port_mux_lut[y].res == per) {
 255
 256                         /* SET PORTMUX REG */
 257
 258                         offset = port_mux_lut[y].offset;
 259                         muxreg = bfin_read_PORT_MUX();
 260
 261                         if (offset != 1)
 262                                 muxreg &= ~(1 << offset);
 263                         else
 264                                 muxreg &= ~(3 << 1);
 265
 266                         muxreg |= (function << offset);
 267                         bfin_write_PORT_MUX(muxreg);
 268                 }
 269         }
 270 }
 271 #elif defined(CONFIG_BF52x) || defined(CONFIG_BF51x)
 272 inline void portmux_setup(unsigned short per)
 273 {
 274         u16 pmux, ident = P_IDENT(per), function = P_FUNCT2MUX(per);
 275         u8 offset = pmux_offset[gpio_bank(ident)][gpio_sub_n(ident)];
 276
 277         pmux = *port_mux[gpio_bank(ident)];
 278         pmux &= ~(3 << offset);
 279         pmux |= (function & 3) << offset;
 280         *port_mux[gpio_bank(ident)] = pmux;
 281         SSYNC();
 282 }
 283 #else
 284 # define portmux_setup(...)  do { } while (0)
 285 #endif
 286
 287 /***********************************************************
 288 *
 289 * FUNCTIONS: Blackfin General Purpose Ports Access Functions
 290 *
 291 * INPUTS/OUTPUTS:
 292 * gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
 293 *
 294 *
 295 * DESCRIPTION: These functions abstract direct register access
 296 *              to Blackfin processor General Purpose
 297 *              Ports Regsiters
 298 *
 299 * CAUTION: These functions do not belong to the GPIO Driver API
 300 *************************************************************
 301 * MODIFICATION HISTORY :
 302 **************************************************************/
 303
 304 /* Set a specific bit */
 305
 306 #define SET_GPIO(name) \
 307 void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
 308 { \
 309         unsigned long flags; \
 310         local_irq_save(flags); \
 311         if (arg) \
 312                 gpio_array[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
 313         else \
 314                 gpio_array[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \
 315         AWA_DUMMY_READ(name); \
 316         local_irq_restore(flags); \
 317 }
 318
 319 SET_GPIO(dir)   /* set_gpio_dir() */
 320 SET_GPIO(inen)  /* set_gpio_inen() */
 321 SET_GPIO(polar) /* set_gpio_polar() */
 322 SET_GPIO(edge)  /* set_gpio_edge() */
 323 SET_GPIO(both)  /* set_gpio_both() */
 324
 325
 326 #define SET_GPIO_SC(name) \
 327 void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
 328 { \
 329         unsigned long flags; \
 330         if (ANOMALY_05000311 || ANOMALY_05000323) \
 331                 local_irq_save(flags); \
 332         if (arg) \
 333                 gpio_array[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
 334         else \
 335                 gpio_array[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
 336         if (ANOMALY_05000311 || ANOMALY_05000323) { \
 337                 AWA_DUMMY_READ(name); \
 338                 local_irq_restore(flags); \
 339         } \
 340 }
 341
 342 SET_GPIO_SC(maska)
 343 SET_GPIO_SC(maskb)
 344 SET_GPIO_SC(data)
 345
 346 void set_gpio_toggle(unsigned gpio)
 347 {
 348         unsigned long flags;
 349         if (ANOMALY_05000311 || ANOMALY_05000323)
 350                 local_irq_save(flags);
 351         gpio_array[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
 352         if (ANOMALY_05000311 || ANOMALY_05000323) {
 353                 AWA_DUMMY_READ(toggle);
 354                 local_irq_restore(flags);
 355         }
 356 }
 357
 358 /* Set current PORT date (16-bit word) */
 359
 360 #define SET_GPIO_P(name) \
 361 void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \
 362 { \
 363         unsigned long flags; \
 364         if (ANOMALY_05000311 || ANOMALY_05000323) \
 365                 local_irq_save(flags); \
 366         gpio_array[gpio_bank(gpio)]->name = arg; \
 367         if (ANOMALY_05000311 || ANOMALY_05000323) { \
 368                 AWA_DUMMY_READ(name); \
 369                 local_irq_restore(flags); \
 370         } \
 371 }
 372
 373 SET_GPIO_P(data)
 374 SET_GPIO_P(dir)
 375 SET_GPIO_P(inen)
 376 SET_GPIO_P(polar)
 377 SET_GPIO_P(edge)
 378 SET_GPIO_P(both)
 379 SET_GPIO_P(maska)
 380 SET_GPIO_P(maskb)
 381
 382 /* Get a specific bit */
 383 #define GET_GPIO(name) \
 384 unsigned short get_gpio_ ## name(unsigned gpio) \
 385 { \
 386         unsigned long flags; \
 387         unsigned short ret; \
 388         if (ANOMALY_05000311 || ANOMALY_05000323) \
 389                 local_irq_save(flags); \
 390         ret = 0x01 & (gpio_array[gpio_bank(gpio)]->name >> gpio_sub_n(gpio)); \
 391         if (ANOMALY_05000311 || ANOMALY_05000323) { \
 392                 AWA_DUMMY_READ(name); \
 393                 local_irq_restore(flags); \
 394         } \
 395         return ret; \
 396 }
 397
 398 GET_GPIO(data)
 399 GET_GPIO(dir)
 400 GET_GPIO(inen)
 401 GET_GPIO(polar)
 402 GET_GPIO(edge)
 403 GET_GPIO(both)
 404 GET_GPIO(maska)
 405 GET_GPIO(maskb)
 406
 407 /* Get current PORT date (16-bit word) */
 408
 409 #define GET_GPIO_P(name) \
 410 unsigned short get_gpiop_ ## name(unsigned gpio) \
 411 { \
 412         unsigned long flags; \
 413         unsigned short ret; \
 414         if (ANOMALY_05000311 || ANOMALY_05000323) \
 415                 local_irq_save(flags); \
 416         ret = (gpio_array[gpio_bank(gpio)]->name); \
 417         if (ANOMALY_05000311 || ANOMALY_05000323) { \
 418                 AWA_DUMMY_READ(name); \
 419                 local_irq_restore(flags); \
 420         } \
 421         return ret; \
 422 }
 423
 424 GET_GPIO_P(data)
 425 GET_GPIO_P(dir)
 426 GET_GPIO_P(inen)
 427 GET_GPIO_P(polar)
 428 GET_GPIO_P(edge)
 429 GET_GPIO_P(both)
 430 GET_GPIO_P(maska)
 431 GET_GPIO_P(maskb)
 432
 433 /***********************************************************
 434 *
 435 * FUNCTIONS:    Blackfin Peripheral Resource Allocation
 436 *               and PortMux Setup
 437 *
 438 * INPUTS/OUTPUTS:
 439 * per   Peripheral Identifier
 440 * label String
 441 *
 442 * DESCRIPTION: Blackfin Peripheral Resource Allocation and Setup API
 443 *
 444 * CAUTION:
 445 *************************************************************
 446 * MODIFICATION HISTORY :
 447 **************************************************************/
 448
 449 int peripheral_request(unsigned short per, const char *label)
 450 {
 451         unsigned short ident = P_IDENT(per);
 452
 453         /*
 454          * Don't cares are pins with only one dedicated function
 455          */
 456
 457         if (per & P_DONTCARE)
 458                 return 0;
 459
 460         if (!(per & P_DEFINED))
 461                 return -ENODEV;
 462
 463         BUG_ON(ident >= MAX_RESOURCES);
 464
 465         /* If a pin can be muxed as either GPIO or peripheral, make
 466          * sure it is not already a GPIO pin when we request it.
 467          */
 468         if (unlikely(!check_gpio(ident) && is_reserved(gpio, ident, 1))) {
 469                 printf("%s: Peripheral %d is already reserved as GPIO by %s !\n",
 470                        __func__, ident, get_label(ident));
 471                 return -EBUSY;
 472         }
 473
 474         if (unlikely(is_reserved(peri, ident, 1))) {
 475
 476                 /*
 477                  * Pin functions like AMC address strobes my
 478                  * be requested and used by several drivers
 479                  */
 480
 481                 if (!(per & P_MAYSHARE)) {
 482                         /*
 483                          * Allow that the identical pin function can
 484                          * be requested from the same driver twice
 485                          */
 486
 487                         if (cmp_label(ident, label) == 0)
 488                                 goto anyway;
 489
 490                         printf("%s: Peripheral %d function %d is already reserved by %s !\n",
 491                                __func__, ident, P_FUNCT2MUX(per), get_label(ident));
 492                         return -EBUSY;
 493                 }
 494         }
 495
 496  anyway:
 497         reserve(peri, ident);
 498
 499         portmux_setup(per);
 500         port_setup(ident, PERIPHERAL_USAGE);
 501
 502         set_label(ident, label);
 503
 504         return 0;
 505 }
 506
 507 int peripheral_request_list(const unsigned short per[], const char *label)
 508 {
 509         u16 cnt;
 510         int ret;
 511
 512         for (cnt = 0; per[cnt] != 0; cnt++) {
 513
 514                 ret = peripheral_request(per[cnt], label);
 515
 516                 if (ret < 0) {
 517                         for ( ; cnt > 0; cnt--)
 518                                 peripheral_free(per[cnt - 1]);
 519
 520                         return ret;
 521                 }
 522         }
 523
 524         return 0;
 525 }
 526
 527 void peripheral_free(unsigned short per)
 528 {
 529         unsigned short ident = P_IDENT(per);
 530
 531         if (per & P_DONTCARE)
 532                 return;
 533
 534         if (!(per & P_DEFINED))
 535                 return;
 536
 537         if (unlikely(!is_reserved(peri, ident, 0)))
 538                 return;
 539
 540         if (!(per & P_MAYSHARE))
 541                 port_setup(ident, GPIO_USAGE);
 542
 543         unreserve(peri, ident);
 544
 545         set_label(ident, "free");
 546 }
 547
 548 void peripheral_free_list(const unsigned short per[])
 549 {
 550         u16 cnt;
 551         for (cnt = 0; per[cnt] != 0; cnt++)
 552                 peripheral_free(per[cnt]);
 553 }
 554
 555 /***********************************************************
 556 *
 557 * FUNCTIONS: Blackfin GPIO Driver
 558 *
 559 * INPUTS/OUTPUTS:
 560 * gpio  PIO Number between 0 and MAX_BLACKFIN_GPIOS
 561 * label String
 562 *
 563 * DESCRIPTION: Blackfin GPIO Driver API
 564 *
 565 * CAUTION:
 566 *************************************************************
 567 * MODIFICATION HISTORY :
 568 **************************************************************/
 569
 570 int gpio_request(unsigned gpio, const char *label)
 571 {
 572         if (check_gpio(gpio) < 0)
 573                 return -EINVAL;
 574
 575         /*
 576          * Allow that the identical GPIO can
 577          * be requested from the same driver twice
 578          * Do nothing and return -
 579          */
 580
 581         if (cmp_label(gpio, label) == 0)
 582                 return 0;
 583
 584         if (unlikely(is_reserved(gpio, gpio, 1))) {
 585                 printf("bfin-gpio: GPIO %d is already reserved by %s !\n",
 586                        gpio, get_label(gpio));
 587                 return -EBUSY;
 588         }
 589         if (unlikely(is_reserved(peri, gpio, 1))) {
 590                 printf("bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
 591                        gpio, get_label(gpio));
 592                 return -EBUSY;
 593         }
 594         else {  /* Reset POLAR setting when acquiring a gpio for the first time */
 595                 set_gpio_polar(gpio, 0);
 596         }
 597
 598         reserve(gpio, gpio);
 599         set_label(gpio, label);
 600
 601         port_setup(gpio, GPIO_USAGE);
 602
 603         return 0;
 604 }
 605
 606 int gpio_free(unsigned gpio)
 607 {
 608         if (check_gpio(gpio) < 0)
 609                 return -1;
 610
 611         if (unlikely(!is_reserved(gpio, gpio, 0))) {
 612                 gpio_error(gpio);
 613                 return -1;
 614         }
 615
 616         unreserve(gpio, gpio);
 617
 618         set_label(gpio, "free");
 619
 620         return 0;
 621 }
 622
 623 #ifdef ADI_SPECIAL_GPIO_BANKS
 624 DECLARE_RESERVED_MAP(special_gpio, gpio_bank(MAX_RESOURCES));
 625
 626 int special_gpio_request(unsigned gpio, const char *label)
 627 {
 628         /*
 629          * Allow that the identical GPIO can
 630          * be requested from the same driver twice
 631          * Do nothing and return -
 632          */
 633
 634         if (cmp_label(gpio, label) == 0)
 635                 return 0;
 636
 637         if (unlikely(is_reserved(special_gpio, gpio, 1))) {
 638                 printf("bfin-gpio: GPIO %d is already reserved by %s !\n",
 639                        gpio, get_label(gpio));
 640                 return -EBUSY;
 641         }
 642         if (unlikely(is_reserved(peri, gpio, 1))) {
 643                 printf("bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
 644                        gpio, get_label(gpio));
 645
 646                 return -EBUSY;
 647         }
 648
 649         reserve(special_gpio, gpio);
 650         reserve(peri, gpio);
 651
 652         set_label(gpio, label);
 653         port_setup(gpio, GPIO_USAGE);
 654
 655         return 0;
 656 }
 657
 658 void special_gpio_free(unsigned gpio)
 659 {
 660         if (unlikely(!is_reserved(special_gpio, gpio, 0))) {
 661                 gpio_error(gpio);
 662                 return;
 663         }
 664
 665         reserve(special_gpio, gpio);
 666         reserve(peri, gpio);
 667         set_label(gpio, "free");
 668 }
 669 #endif
 670
 671 static inline void __gpio_direction_input(unsigned gpio)
 672 {
 673         gpio_array[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
 674         gpio_array[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
 675 }
 676
 677 int gpio_direction_input(unsigned gpio)
 678 {
 679         unsigned long flags;
 680
 681         if (!is_reserved(gpio, gpio, 0)) {
 682                 gpio_error(gpio);
 683                 return -EINVAL;
 684         }
 685
 686         local_irq_save(flags);
 687         __gpio_direction_input(gpio);
 688         AWA_DUMMY_READ(inen);
 689         local_irq_restore(flags);
 690
 691         return 0;
 692 }
 693
 694 int gpio_set_value(unsigned gpio, int arg)
 695 {
 696         if (arg)
 697                 gpio_array[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
 698         else
 699                 gpio_array[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);
 700
 701         return 0;
 702 }
 703
 704 int gpio_direction_output(unsigned gpio, int value)
 705 {
 706         unsigned long flags;
 707
 708         if (!is_reserved(gpio, gpio, 0)) {
 709                 gpio_error(gpio);
 710                 return -EINVAL;
 711         }
 712
 713         local_irq_save(flags);
 714
 715         gpio_array[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
 716         gpio_set_value(gpio, value);
 717         gpio_array[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
 718
 719         AWA_DUMMY_READ(dir);
 720         local_irq_restore(flags);
 721
 722         return 0;
 723 }
 724
 725 int gpio_get_value(unsigned gpio)
 726 {
 727         unsigned long flags;
 728
 729         if (unlikely(get_gpio_edge(gpio))) {
 730                 int ret;
 731                 local_irq_save(flags);
 732                 set_gpio_edge(gpio, 0);
 733                 ret = get_gpio_data(gpio);
 734                 set_gpio_edge(gpio, 1);
 735                 local_irq_restore(flags);
 736                 return ret;
 737         } else
 738                 return get_gpio_data(gpio);
 739 }
 740
 741 /* If we are booting from SPI and our board lacks a strong enough pull up,
 742  * the core can reset and execute the bootrom faster than the resistor can
 743  * pull the signal logically high.  To work around this (common) error in
 744  * board design, we explicitly set the pin back to GPIO mode, force /CS
 745  * high, and wait for the electrons to do their thing.
 746  *
 747  * This function only makes sense to be called from reset code, but it
 748  * lives here as we need to force all the GPIO states w/out going through
 749  * BUG() checks and such.
 750  */
 751 void bfin_reset_boot_spi_cs(unsigned short pin)
 752 {
 753         unsigned short gpio = P_IDENT(pin);
 754         port_setup(gpio, GPIO_USAGE);
 755         gpio_array[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
 756         AWA_DUMMY_READ(data_set);
 757         udelay(1);
 758 }
 759
 760 void gpio_labels(void)
 761 {
 762         int c, gpio;
 763
 764         for (c = 0; c < MAX_RESOURCES; c++) {
 765                 gpio = is_reserved(gpio, c, 1);
 766                 if (!check_gpio(c) && gpio)
 767                         printf("GPIO_%d:\t%s\tGPIO %s\n", c,
 768                                 get_label(c),
 769                                 get_gpio_dir(c) ? "OUTPUT" : "INPUT");
 770                 else if (is_reserved(peri, c, 1))
 771                         printf("GPIO_%d:\t%s\tPeripheral\n", c, get_label(c));
 772                 else
 773                         continue;
 774         }
 775 }