arch/blackfin/kernel/bfin_gpio.c

   1 /*
   2  * File:         arch/blackfin/kernel/bfin_gpio.c
   3  * Based on:
   4  * Author:       Michael Hennerich (hennerich@blackfin.uclinux.org)
   5  *
   6  * Created:
   7  * Description:  GPIO Abstraction Layer
   8  *
   9  * Modified:
  10  *               Copyright 2008 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 /*
  31 *  Number     BF537/6/4    BF561    BF533/2/1      BF549/8/4/2
  32 *
  33 *  GPIO_0       PF0         PF0        PF0         PA0...PJ13
  34 *  GPIO_1       PF1         PF1        PF1
  35 *  GPIO_2       PF2         PF2        PF2
  36 *  GPIO_3       PF3         PF3        PF3
  37 *  GPIO_4       PF4         PF4        PF4
  38 *  GPIO_5       PF5         PF5        PF5
  39 *  GPIO_6       PF6         PF6        PF6
  40 *  GPIO_7       PF7         PF7        PF7
  41 *  GPIO_8       PF8         PF8        PF8
  42 *  GPIO_9       PF9         PF9        PF9
  43 *  GPIO_10      PF10        PF10       PF10
  44 *  GPIO_11      PF11        PF11       PF11
  45 *  GPIO_12      PF12        PF12       PF12
  46 *  GPIO_13      PF13        PF13       PF13
  47 *  GPIO_14      PF14        PF14       PF14
  48 *  GPIO_15      PF15        PF15       PF15
  49 *  GPIO_16      PG0         PF16
  50 *  GPIO_17      PG1         PF17
  51 *  GPIO_18      PG2         PF18
  52 *  GPIO_19      PG3         PF19
  53 *  GPIO_20      PG4         PF20
  54 *  GPIO_21      PG5         PF21
  55 *  GPIO_22      PG6         PF22
  56 *  GPIO_23      PG7         PF23
  57 *  GPIO_24      PG8         PF24
  58 *  GPIO_25      PG9         PF25
  59 *  GPIO_26      PG10        PF26
  60 *  GPIO_27      PG11        PF27
  61 *  GPIO_28      PG12        PF28
  62 *  GPIO_29      PG13        PF29
  63 *  GPIO_30      PG14        PF30
  64 *  GPIO_31      PG15        PF31
  65 *  GPIO_32      PH0         PF32
  66 *  GPIO_33      PH1         PF33
  67 *  GPIO_34      PH2         PF34
  68 *  GPIO_35      PH3         PF35
  69 *  GPIO_36      PH4         PF36
  70 *  GPIO_37      PH5         PF37
  71 *  GPIO_38      PH6         PF38
  72 *  GPIO_39      PH7         PF39
  73 *  GPIO_40      PH8         PF40
  74 *  GPIO_41      PH9         PF41
  75 *  GPIO_42      PH10        PF42
  76 *  GPIO_43      PH11        PF43
  77 *  GPIO_44      PH12        PF44
  78 *  GPIO_45      PH13        PF45
  79 *  GPIO_46      PH14        PF46
  80 *  GPIO_47      PH15        PF47
  81 */
  82
  83 #include <linux/delay.h>
  84 #include <linux/module.h>
  85 #include <linux/err.h>
  86 #include <linux/proc_fs.h>
  87 #include <asm/blackfin.h>
  88 #include <asm/gpio.h>
  89 #include <asm/portmux.h>
  90 #include <linux/irq.h>
  91
  92 #if ANOMALY_05000311 || ANOMALY_05000323
  93 enum {
  94         AWA_data = SYSCR,
  95         AWA_data_clear = SYSCR,
  96         AWA_data_set = SYSCR,
  97         AWA_toggle = SYSCR,
  98         AWA_maska = BFIN_UART_SCR,
  99         AWA_maska_clear = BFIN_UART_SCR,
 100         AWA_maska_set = BFIN_UART_SCR,
 101         AWA_maska_toggle = BFIN_UART_SCR,
 102         AWA_maskb = BFIN_UART_GCTL,
 103         AWA_maskb_clear = BFIN_UART_GCTL,
 104         AWA_maskb_set = BFIN_UART_GCTL,
 105         AWA_maskb_toggle = BFIN_UART_GCTL,
 106         AWA_dir = SPORT1_STAT,
 107         AWA_polar = SPORT1_STAT,
 108         AWA_edge = SPORT1_STAT,
 109         AWA_both = SPORT1_STAT,
 110 #if ANOMALY_05000311
 111         AWA_inen = TIMER_ENABLE,
 112 #elif ANOMALY_05000323
 113         AWA_inen = DMA1_1_CONFIG,
 114 #endif
 115 };
 116         /* Anomaly Workaround */
 117 #define AWA_DUMMY_READ(name) bfin_read16(AWA_ ## name)
 118 #else
 119 #define AWA_DUMMY_READ(...)  do { } while (0)
 120 #endif
 121
 122 #ifdef BF533_FAMILY
 123 static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
 124         (struct gpio_port_t *) FIO_FLAG_D,
 125 };
 126 #endif
 127
 128 #if defined(BF527_FAMILY) || defined(BF537_FAMILY)
 129 static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
 130         (struct gpio_port_t *) PORTFIO,
 131         (struct gpio_port_t *) PORTGIO,
 132         (struct gpio_port_t *) PORTHIO,
 133 };
 134
 135 static unsigned short *port_fer[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
 136         (unsigned short *) PORTF_FER,
 137         (unsigned short *) PORTG_FER,
 138         (unsigned short *) PORTH_FER,
 139 };
 140 #endif
 141
 142 #ifdef BF527_FAMILY
 143 static unsigned short *port_mux[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
 144         (unsigned short *) PORTF_MUX,
 145         (unsigned short *) PORTG_MUX,
 146         (unsigned short *) PORTH_MUX,
 147 };
 148
 149 static const
 150 u8 pmux_offset[][16] =
 151         {{ 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 4, 6, 8, 8, 10, 10 }, /* PORTF */
 152          { 0, 0, 0, 0, 0, 2, 2, 4, 4, 6, 8, 10, 10, 10, 12, 12 }, /* PORTG */
 153          { 0, 0, 0, 0, 0, 0, 0, 0, 2, 4, 4, 4, 4, 4, 4, 4 }, /* PORTH */
 154         };
 155 #endif
 156
 157 #ifdef BF561_FAMILY
 158 static struct gpio_port_t *gpio_bankb[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
 159         (struct gpio_port_t *) FIO0_FLAG_D,
 160         (struct gpio_port_t *) FIO1_FLAG_D,
 161         (struct gpio_port_t *) FIO2_FLAG_D,
 162 };
 163 #endif
 164
 165 #ifdef BF548_FAMILY
 166 static struct gpio_port_t *gpio_array[gpio_bank(MAX_BLACKFIN_GPIOS)] = {
 167         (struct gpio_port_t *)PORTA_FER,
 168         (struct gpio_port_t *)PORTB_FER,
 169         (struct gpio_port_t *)PORTC_FER,
 170         (struct gpio_port_t *)PORTD_FER,
 171         (struct gpio_port_t *)PORTE_FER,
 172         (struct gpio_port_t *)PORTF_FER,
 173         (struct gpio_port_t *)PORTG_FER,
 174         (struct gpio_port_t *)PORTH_FER,
 175         (struct gpio_port_t *)PORTI_FER,
 176         (struct gpio_port_t *)PORTJ_FER,
 177 };
 178 #endif
 179
 180 static unsigned short reserved_gpio_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
 181 static unsigned short reserved_peri_map[gpio_bank(MAX_RESOURCES)];
 182
 183 #define RESOURCE_LABEL_SIZE     16
 184
 185 static struct str_ident {
 186         char name[RESOURCE_LABEL_SIZE];
 187 } str_ident[MAX_RESOURCES];
 188
 189 #if defined(CONFIG_PM) && !defined(CONFIG_BF54x)
 190 static unsigned short wakeup_map[gpio_bank(MAX_BLACKFIN_GPIOS)];
 191 static unsigned char wakeup_flags_map[MAX_BLACKFIN_GPIOS];
 192 static struct gpio_port_s gpio_bank_saved[gpio_bank(MAX_BLACKFIN_GPIOS)];
 193
 194 #ifdef BF533_FAMILY
 195 static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB};
 196 #endif
 197
 198 #ifdef BF537_FAMILY
 199 static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG_INTB, IRQ_PORTG_INTB, IRQ_MAC_TX};
 200 #endif
 201
 202 #ifdef BF527_FAMILY
 203 static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PORTF_INTB, IRQ_PORTG_INTB, IRQ_PORTH_INTB};
 204 #endif
 205
 206 #ifdef BF561_FAMILY
 207 static unsigned int sic_iwr_irqs[gpio_bank(MAX_BLACKFIN_GPIOS)] = {IRQ_PROG0_INTB, IRQ_PROG1_INTB, IRQ_PROG2_INTB};
 208 #endif
 209
 210 #endif /* CONFIG_PM */
 211
 212 #if defined(BF548_FAMILY)
 213 inline int check_gpio(unsigned gpio)
 214 {
 215         if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15
 216             || gpio == GPIO_PH14 || gpio == GPIO_PH15
 217             || gpio == GPIO_PJ14 || gpio == GPIO_PJ15
 218             || gpio > MAX_BLACKFIN_GPIOS)
 219                 return -EINVAL;
 220         return 0;
 221 }
 222 #else
 223 inline int check_gpio(unsigned gpio)
 224 {
 225         if (gpio >= MAX_BLACKFIN_GPIOS)
 226                 return -EINVAL;
 227         return 0;
 228 }
 229 #endif
 230
 231 void gpio_error(unsigned gpio)
 232 {
 233         printk(KERN_ERR "bfin-gpio: GPIO %d wasn't requested!\n", gpio);
 234 }
 235
 236 static void set_label(unsigned short ident, const char *label)
 237 {
 238         if (label && str_ident) {
 239                 strncpy(str_ident[ident].name, label,
 240                          RESOURCE_LABEL_SIZE);
 241                 str_ident[ident].name[RESOURCE_LABEL_SIZE - 1] = 0;
 242         }
 243 }
 244
 245 static char *get_label(unsigned short ident)
 246 {
 247         if (!str_ident)
 248                 return "UNKNOWN";
 249
 250         return (*str_ident[ident].name ? str_ident[ident].name : "UNKNOWN");
 251 }
 252
 253 static int cmp_label(unsigned short ident, const char *label)
 254 {
 255         if (label == NULL) {
 256                 dump_stack();
 257                 printk(KERN_ERR "Please provide none-null label\n");
 258         }
 259
 260         if (label && str_ident)
 261                 return strncmp(str_ident[ident].name,
 262                                  label, strlen(label));
 263         else
 264                 return -EINVAL;
 265 }
 266
 267 #if defined(BF527_FAMILY) || defined(BF537_FAMILY)
 268 static void port_setup(unsigned gpio, unsigned short usage)
 269 {
 270         if (!check_gpio(gpio)) {
 271                 if (usage == GPIO_USAGE)
 272                         *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
 273                 else
 274                         *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
 275                 SSYNC();
 276         }
 277 }
 278 #elif defined(BF548_FAMILY)
 279 static void port_setup(unsigned gpio, unsigned short usage)
 280 {
 281         if (usage == GPIO_USAGE)
 282                 gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio);
 283         else
 284                 gpio_array[gpio_bank(gpio)]->port_fer |= gpio_bit(gpio);
 285         SSYNC();
 286 }
 287 #else
 288 # define port_setup(...)  do { } while (0)
 289 #endif
 290
 291 #ifdef BF537_FAMILY
 292 static struct {
 293         unsigned short res;
 294         unsigned short offset;
 295 } port_mux_lut[] = {
 296         {.res = P_PPI0_D13, .offset = 11},
 297         {.res = P_PPI0_D14, .offset = 11},
 298         {.res = P_PPI0_D15, .offset = 11},
 299         {.res = P_SPORT1_TFS, .offset = 11},
 300         {.res = P_SPORT1_TSCLK, .offset = 11},
 301         {.res = P_SPORT1_DTPRI, .offset = 11},
 302         {.res = P_PPI0_D10, .offset = 10},
 303         {.res = P_PPI0_D11, .offset = 10},
 304         {.res = P_PPI0_D12, .offset = 10},
 305         {.res = P_SPORT1_RSCLK, .offset = 10},
 306         {.res = P_SPORT1_RFS, .offset = 10},
 307         {.res = P_SPORT1_DRPRI, .offset = 10},
 308         {.res = P_PPI0_D8, .offset = 9},
 309         {.res = P_PPI0_D9, .offset = 9},
 310         {.res = P_SPORT1_DRSEC, .offset = 9},
 311         {.res = P_SPORT1_DTSEC, .offset = 9},
 312         {.res = P_TMR2, .offset = 8},
 313         {.res = P_PPI0_FS3, .offset = 8},
 314         {.res = P_TMR3, .offset = 7},
 315         {.res = P_SPI0_SSEL4, .offset = 7},
 316         {.res = P_TMR4, .offset = 6},
 317         {.res = P_SPI0_SSEL5, .offset = 6},
 318         {.res = P_TMR5, .offset = 5},
 319         {.res = P_SPI0_SSEL6, .offset = 5},
 320         {.res = P_UART1_RX, .offset = 4},
 321         {.res = P_UART1_TX, .offset = 4},
 322         {.res = P_TMR6, .offset = 4},
 323         {.res = P_TMR7, .offset = 4},
 324         {.res = P_UART0_RX, .offset = 3},
 325         {.res = P_UART0_TX, .offset = 3},
 326         {.res = P_DMAR0, .offset = 3},
 327         {.res = P_DMAR1, .offset = 3},
 328         {.res = P_SPORT0_DTSEC, .offset = 1},
 329         {.res = P_SPORT0_DRSEC, .offset = 1},
 330         {.res = P_CAN0_RX, .offset = 1},
 331         {.res = P_CAN0_TX, .offset = 1},
 332         {.res = P_SPI0_SSEL7, .offset = 1},
 333         {.res = P_SPORT0_TFS, .offset = 0},
 334         {.res = P_SPORT0_DTPRI, .offset = 0},
 335         {.res = P_SPI0_SSEL2, .offset = 0},
 336         {.res = P_SPI0_SSEL3, .offset = 0},
 337 };
 338
 339 static void portmux_setup(unsigned short per, unsigned short function)
 340 {
 341         u16 y, offset, muxreg;
 342
 343         for (y = 0; y < ARRAY_SIZE(port_mux_lut); y++) {
 344                 if (port_mux_lut[y].res == per) {
 345
 346                         /* SET PORTMUX REG */
 347
 348                         offset = port_mux_lut[y].offset;
 349                         muxreg = bfin_read_PORT_MUX();
 350
 351                         if (offset != 1)
 352                                 muxreg &= ~(1 << offset);
 353                         else
 354                                 muxreg &= ~(3 << 1);
 355
 356                         muxreg |= (function << offset);
 357                         bfin_write_PORT_MUX(muxreg);
 358                 }
 359         }
 360 }
 361 #elif defined(BF548_FAMILY)
 362 inline void portmux_setup(unsigned short portno, unsigned short function)
 363 {
 364         u32 pmux;
 365
 366         pmux = gpio_array[gpio_bank(portno)]->port_mux;
 367
 368         pmux &= ~(0x3 << (2 * gpio_sub_n(portno)));
 369         pmux |= (function & 0x3) << (2 * gpio_sub_n(portno));
 370
 371         gpio_array[gpio_bank(portno)]->port_mux = pmux;
 372 }
 373
 374 inline u16 get_portmux(unsigned short portno)
 375 {
 376         u32 pmux;
 377
 378         pmux = gpio_array[gpio_bank(portno)]->port_mux;
 379
 380         return (pmux >> (2 * gpio_sub_n(portno)) & 0x3);
 381 }
 382 #elif defined(BF527_FAMILY)
 383 inline void portmux_setup(unsigned short portno, unsigned short function)
 384 {
 385         u16 pmux, ident = P_IDENT(portno);
 386         u8 offset = pmux_offset[gpio_bank(ident)][gpio_sub_n(ident)];
 387
 388         pmux = *port_mux[gpio_bank(ident)];
 389         pmux &= ~(3 << offset);
 390         pmux |= (function & 3) << offset;
 391         *port_mux[gpio_bank(ident)] = pmux;
 392         SSYNC();
 393 }
 394 #else
 395 # define portmux_setup(...)  do { } while (0)
 396 #endif
 397
 398 static int __init bfin_gpio_init(void)
 399 {
 400         printk(KERN_INFO "Blackfin GPIO Controller\n");
 401
 402         return 0;
 403 }
 404 arch_initcall(bfin_gpio_init);
 405
 406
 407 #ifndef BF548_FAMILY
 408 /***********************************************************
 409 *
 410 * FUNCTIONS: Blackfin General Purpose Ports Access Functions
 411 *
 412 * INPUTS/OUTPUTS:
 413 * gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
 414 *
 415 *
 416 * DESCRIPTION: These functions abstract direct register access
 417 *              to Blackfin processor General Purpose
 418 *              Ports Regsiters
 419 *
 420 * CAUTION: These functions do not belong to the GPIO Driver API
 421 *************************************************************
 422 * MODIFICATION HISTORY :
 423 **************************************************************/
 424
 425 /* Set a specific bit */
 426
 427 #define SET_GPIO(name) \
 428 void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
 429 { \
 430         unsigned long flags; \
 431         local_irq_save(flags); \
 432         if (arg) \
 433                 gpio_bankb[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
 434         else \
 435                 gpio_bankb[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \
 436         AWA_DUMMY_READ(name); \
 437         local_irq_restore(flags); \
 438 } \
 439 EXPORT_SYMBOL(set_gpio_ ## name);
 440
 441 SET_GPIO(dir)
 442 SET_GPIO(inen)
 443 SET_GPIO(polar)
 444 SET_GPIO(edge)
 445 SET_GPIO(both)
 446
 447
 448 #if ANOMALY_05000311 || ANOMALY_05000323
 449 #define SET_GPIO_SC(name) \
 450 void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
 451 { \
 452         unsigned long flags; \
 453         local_irq_save(flags); \
 454         if (arg) \
 455                 gpio_bankb[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
 456         else \
 457                 gpio_bankb[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
 458         AWA_DUMMY_READ(name); \
 459         local_irq_restore(flags); \
 460 } \
 461 EXPORT_SYMBOL(set_gpio_ ## name);
 462 #else
 463 #define SET_GPIO_SC(name) \
 464 void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
 465 { \
 466         if (arg) \
 467                 gpio_bankb[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
 468         else \
 469                 gpio_bankb[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
 470 } \
 471 EXPORT_SYMBOL(set_gpio_ ## name);
 472 #endif
 473
 474 SET_GPIO_SC(maska)
 475 SET_GPIO_SC(maskb)
 476 SET_GPIO_SC(data)
 477
 478 #if ANOMALY_05000311 || ANOMALY_05000323
 479 void set_gpio_toggle(unsigned gpio)
 480 {
 481         unsigned long flags;
 482         local_irq_save(flags);
 483         gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
 484         AWA_DUMMY_READ(toggle);
 485         local_irq_restore(flags);
 486 }
 487 #else
 488 void set_gpio_toggle(unsigned gpio)
 489 {
 490         gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
 491 }
 492 #endif
 493 EXPORT_SYMBOL(set_gpio_toggle);
 494
 495
 496 /*Set current PORT date (16-bit word)*/
 497
 498 #if ANOMALY_05000311 || ANOMALY_05000323
 499 #define SET_GPIO_P(name) \
 500 void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \
 501 { \
 502         unsigned long flags; \
 503         local_irq_save(flags); \
 504         gpio_bankb[gpio_bank(gpio)]->name = arg; \
 505         AWA_DUMMY_READ(name); \
 506         local_irq_restore(flags); \
 507 } \
 508 EXPORT_SYMBOL(set_gpiop_ ## name);
 509 #else
 510 #define SET_GPIO_P(name) \
 511 void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \
 512 { \
 513         gpio_bankb[gpio_bank(gpio)]->name = arg; \
 514 } \
 515 EXPORT_SYMBOL(set_gpiop_ ## name);
 516 #endif
 517
 518 SET_GPIO_P(data)
 519 SET_GPIO_P(dir)
 520 SET_GPIO_P(inen)
 521 SET_GPIO_P(polar)
 522 SET_GPIO_P(edge)
 523 SET_GPIO_P(both)
 524 SET_GPIO_P(maska)
 525 SET_GPIO_P(maskb)
 526
 527 /* Get a specific bit */
 528 #if ANOMALY_05000311 || ANOMALY_05000323
 529 #define GET_GPIO(name) \
 530 unsigned short get_gpio_ ## name(unsigned gpio) \
 531 { \
 532         unsigned long flags; \
 533         unsigned short ret; \
 534         local_irq_save(flags); \
 535         ret = 0x01 & (gpio_bankb[gpio_bank(gpio)]->name >> gpio_sub_n(gpio)); \
 536         AWA_DUMMY_READ(name); \
 537         local_irq_restore(flags); \
 538         return ret; \
 539 } \
 540 EXPORT_SYMBOL(get_gpio_ ## name);
 541 #else
 542 #define GET_GPIO(name) \
 543 unsigned short get_gpio_ ## name(unsigned gpio) \
 544 { \
 545         return (0x01 & (gpio_bankb[gpio_bank(gpio)]->name >> gpio_sub_n(gpio))); \
 546 } \
 547 EXPORT_SYMBOL(get_gpio_ ## name);
 548 #endif
 549
 550 GET_GPIO(data)
 551 GET_GPIO(dir)
 552 GET_GPIO(inen)
 553 GET_GPIO(polar)
 554 GET_GPIO(edge)
 555 GET_GPIO(both)
 556 GET_GPIO(maska)
 557 GET_GPIO(maskb)
 558
 559 /*Get current PORT date (16-bit word)*/
 560
 561 #if ANOMALY_05000311 || ANOMALY_05000323
 562 #define GET_GPIO_P(name) \
 563 unsigned short get_gpiop_ ## name(unsigned gpio) \
 564 { \
 565         unsigned long flags; \
 566         unsigned short ret; \
 567         local_irq_save(flags); \
 568         ret = (gpio_bankb[gpio_bank(gpio)]->name); \
 569         AWA_DUMMY_READ(name); \
 570         local_irq_restore(flags); \
 571         return ret; \
 572 } \
 573 EXPORT_SYMBOL(get_gpiop_ ## name);
 574 #else
 575 #define GET_GPIO_P(name) \
 576 unsigned short get_gpiop_ ## name(unsigned gpio) \
 577 { \
 578         return (gpio_bankb[gpio_bank(gpio)]->name);\
 579 } \
 580 EXPORT_SYMBOL(get_gpiop_ ## name);
 581 #endif
 582
 583 GET_GPIO_P(data)
 584 GET_GPIO_P(dir)
 585 GET_GPIO_P(inen)
 586 GET_GPIO_P(polar)
 587 GET_GPIO_P(edge)
 588 GET_GPIO_P(both)
 589 GET_GPIO_P(maska)
 590 GET_GPIO_P(maskb)
 591
 592
 593 #ifdef CONFIG_PM
 594 /***********************************************************
 595 *
 596 * FUNCTIONS: Blackfin PM Setup API
 597 *
 598 * INPUTS/OUTPUTS:
 599 * gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
 600 * type -
 601 *       PM_WAKE_RISING
 602 *       PM_WAKE_FALLING
 603 *       PM_WAKE_HIGH
 604 *       PM_WAKE_LOW
 605 *       PM_WAKE_BOTH_EDGES
 606 *
 607 * DESCRIPTION: Blackfin PM Driver API
 608 *
 609 * CAUTION:
 610 *************************************************************
 611 * MODIFICATION HISTORY :
 612 **************************************************************/
 613 int gpio_pm_wakeup_request(unsigned gpio, unsigned char type)
 614 {
 615         unsigned long flags;
 616
 617         if ((check_gpio(gpio) < 0) || !type)
 618                 return -EINVAL;
 619
 620         local_irq_save(flags);
 621         wakeup_map[gpio_bank(gpio)] |= gpio_bit(gpio);
 622         wakeup_flags_map[gpio] = type;
 623         local_irq_restore(flags);
 624
 625         return 0;
 626 }
 627 EXPORT_SYMBOL(gpio_pm_wakeup_request);
 628
 629 void gpio_pm_wakeup_free(unsigned gpio)
 630 {
 631         unsigned long flags;
 632
 633         if (check_gpio(gpio) < 0)
 634                 return;
 635
 636         local_irq_save(flags);
 637
 638         wakeup_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
 639
 640         local_irq_restore(flags);
 641 }
 642 EXPORT_SYMBOL(gpio_pm_wakeup_free);
 643
 644 static int bfin_gpio_wakeup_type(unsigned gpio, unsigned char type)
 645 {
 646         port_setup(gpio, GPIO_USAGE);
 647         set_gpio_dir(gpio, 0);
 648         set_gpio_inen(gpio, 1);
 649
 650         if (type & (PM_WAKE_RISING | PM_WAKE_FALLING))
 651                 set_gpio_edge(gpio, 1);
 652          else
 653                 set_gpio_edge(gpio, 0);
 654
 655         if ((type & (PM_WAKE_BOTH_EDGES)) == (PM_WAKE_BOTH_EDGES))
 656                 set_gpio_both(gpio, 1);
 657         else
 658                 set_gpio_both(gpio, 0);
 659
 660         if ((type & (PM_WAKE_FALLING | PM_WAKE_LOW)))
 661                 set_gpio_polar(gpio, 1);
 662         else
 663                 set_gpio_polar(gpio, 0);
 664
 665         SSYNC();
 666
 667         return 0;
 668 }
 669
 670 u32 bfin_pm_setup(void)
 671 {
 672         u16 bank, mask, i, gpio;
 673
 674         for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
 675                 mask = wakeup_map[gpio_bank(i)];
 676                 bank = gpio_bank(i);
 677
 678                 gpio_bank_saved[bank].maskb = gpio_bankb[bank]->maskb;
 679                 gpio_bankb[bank]->maskb = 0;
 680
 681                 if (mask) {
 682 #ifdef BF537_FAMILY
 683                         gpio_bank_saved[bank].fer   = *port_fer[bank];
 684 #endif
 685                         gpio_bank_saved[bank].inen  = gpio_bankb[bank]->inen;
 686                         gpio_bank_saved[bank].polar = gpio_bankb[bank]->polar;
 687                         gpio_bank_saved[bank].dir   = gpio_bankb[bank]->dir;
 688                         gpio_bank_saved[bank].edge  = gpio_bankb[bank]->edge;
 689                         gpio_bank_saved[bank].both  = gpio_bankb[bank]->both;
 690                         gpio_bank_saved[bank].reserved =
 691                                                 reserved_gpio_map[bank];
 692
 693                         gpio = i;
 694
 695                         while (mask) {
 696                                 if ((mask & 1) && (wakeup_flags_map[gpio] !=
 697                                         PM_WAKE_IGNORE)) {
 698                                         reserved_gpio_map[gpio_bank(gpio)] |=
 699                                                         gpio_bit(gpio);
 700                                         bfin_gpio_wakeup_type(gpio,
 701                                                 wakeup_flags_map[gpio]);
 702                                         set_gpio_data(gpio, 0); /*Clear*/
 703                                 }
 704                                 gpio++;
 705                                 mask >>= 1;
 706                         }
 707
 708                         bfin_internal_set_wake(sic_iwr_irqs[bank], 1);
 709                         gpio_bankb[bank]->maskb_set = wakeup_map[gpio_bank(i)];
 710                 }
 711         }
 712
 713         AWA_DUMMY_READ(maskb_set);
 714
 715         return 0;
 716 }
 717
 718 void bfin_pm_restore(void)
 719 {
 720         u16 bank, mask, i;
 721
 722         for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
 723                 mask = wakeup_map[gpio_bank(i)];
 724                 bank = gpio_bank(i);
 725
 726                 if (mask) {
 727 #ifdef BF537_FAMILY
 728                         *port_fer[bank]         = gpio_bank_saved[bank].fer;
 729 #endif
 730                         gpio_bankb[bank]->inen  = gpio_bank_saved[bank].inen;
 731                         gpio_bankb[bank]->dir   = gpio_bank_saved[bank].dir;
 732                         gpio_bankb[bank]->polar = gpio_bank_saved[bank].polar;
 733                         gpio_bankb[bank]->edge  = gpio_bank_saved[bank].edge;
 734                         gpio_bankb[bank]->both  = gpio_bank_saved[bank].both;
 735
 736                         reserved_gpio_map[bank] =
 737                                         gpio_bank_saved[bank].reserved;
 738                         bfin_internal_set_wake(sic_iwr_irqs[bank], 0);
 739                 }
 740
 741                 gpio_bankb[bank]->maskb = gpio_bank_saved[bank].maskb;
 742         }
 743         AWA_DUMMY_READ(maskb);
 744 }
 745
 746 #endif
 747 #else /* BF548_FAMILY */
 748
 749 unsigned short get_gpio_dir(unsigned gpio)
 750 {
 751         return (0x01 & (gpio_array[gpio_bank(gpio)]->port_dir_clear >> gpio_sub_n(gpio)));
 752 }
 753 EXPORT_SYMBOL(get_gpio_dir);
 754
 755 #endif /* BF548_FAMILY */
 756
 757 /***********************************************************
 758 *
 759 * FUNCTIONS:    Blackfin Peripheral Resource Allocation
 760 *               and PortMux Setup
 761 *
 762 * INPUTS/OUTPUTS:
 763 * per   Peripheral Identifier
 764 * label String
 765 *
 766 * DESCRIPTION: Blackfin Peripheral Resource Allocation and Setup API
 767 *
 768 * CAUTION:
 769 *************************************************************
 770 * MODIFICATION HISTORY :
 771 **************************************************************/
 772
 773 #ifdef BF548_FAMILY
 774 int peripheral_request(unsigned short per, const char *label)
 775 {
 776         unsigned long flags;
 777         unsigned short ident = P_IDENT(per);
 778
 779         /*
 780          * Don't cares are pins with only one dedicated function
 781          */
 782
 783         if (per & P_DONTCARE)
 784                 return 0;
 785
 786         if (!(per & P_DEFINED))
 787                 return -ENODEV;
 788
 789         if (check_gpio(ident) < 0)
 790                 return -EINVAL;
 791
 792         local_irq_save(flags);
 793
 794         if (unlikely(reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
 795                 dump_stack();
 796                 printk(KERN_ERR
 797                     "%s: Peripheral %d is already reserved as GPIO by %s !\n",
 798                        __func__, ident, get_label(ident));
 799                 local_irq_restore(flags);
 800                 return -EBUSY;
 801         }
 802
 803         if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {
 804
 805                 u16 funct = get_portmux(ident);
 806
 807                 /*
 808                  * Pin functions like AMC address strobes my
 809                  * be requested and used by several drivers
 810                  */
 811
 812                 if (!((per & P_MAYSHARE) && (funct == P_FUNCT2MUX(per)))) {
 813
 814                         /*
 815                          * Allow that the identical pin function can
 816                          * be requested from the same driver twice
 817                          */
 818
 819                         if (cmp_label(ident, label) == 0)
 820                                 goto anyway;
 821
 822                         dump_stack();
 823                         printk(KERN_ERR
 824                                "%s: Peripheral %d function %d is already reserved by %s !\n",
 825                                __func__, ident, P_FUNCT2MUX(per), get_label(ident));
 826                         local_irq_restore(flags);
 827                         return -EBUSY;
 828                 }
 829         }
 830
 831  anyway:
 832         reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);
 833
 834         portmux_setup(ident, P_FUNCT2MUX(per));
 835         port_setup(ident, PERIPHERAL_USAGE);
 836
 837         local_irq_restore(flags);
 838         set_label(ident, label);
 839
 840         return 0;
 841 }
 842 EXPORT_SYMBOL(peripheral_request);
 843 #else
 844
 845 int peripheral_request(unsigned short per, const char *label)
 846 {
 847         unsigned long flags;
 848         unsigned short ident = P_IDENT(per);
 849
 850         /*
 851          * Don't cares are pins with only one dedicated function
 852          */
 853
 854         if (per & P_DONTCARE)
 855                 return 0;
 856
 857         if (!(per & P_DEFINED))
 858                 return -ENODEV;
 859
 860         local_irq_save(flags);
 861
 862         if (!check_gpio(ident)) {
 863
 864                 if (unlikely(reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
 865                         dump_stack();
 866                         printk(KERN_ERR
 867                                "%s: Peripheral %d is already reserved as GPIO by %s !\n",
 868                                __func__, ident, get_label(ident));
 869                         local_irq_restore(flags);
 870                         return -EBUSY;
 871                 }
 872
 873         }
 874
 875         if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {
 876
 877                 /*
 878                  * Pin functions like AMC address strobes my
 879                  * be requested and used by several drivers
 880                  */
 881
 882                 if (!(per & P_MAYSHARE)) {
 883
 884                         /*
 885                          * Allow that the identical pin function can
 886                          * be requested from the same driver twice
 887                          */
 888
 889                         if (cmp_label(ident, label) == 0)
 890                                 goto anyway;
 891
 892                         dump_stack();
 893                         printk(KERN_ERR
 894                                "%s: Peripheral %d function %d is already"
 895                                " reserved by %s !\n",
 896                                __func__, ident, P_FUNCT2MUX(per),
 897                                 get_label(ident));
 898                         local_irq_restore(flags);
 899                         return -EBUSY;
 900                 }
 901
 902         }
 903
 904  anyway:
 905         portmux_setup(per, P_FUNCT2MUX(per));
 906
 907         port_setup(ident, PERIPHERAL_USAGE);
 908
 909         reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);
 910         local_irq_restore(flags);
 911         set_label(ident, label);
 912
 913         return 0;
 914 }
 915 EXPORT_SYMBOL(peripheral_request);
 916 #endif
 917
 918 int peripheral_request_list(const unsigned short per[], const char *label)
 919 {
 920         u16 cnt;
 921         int ret;
 922
 923         for (cnt = 0; per[cnt] != 0; cnt++) {
 924
 925                 ret = peripheral_request(per[cnt], label);
 926
 927                 if (ret < 0) {
 928                         for ( ; cnt > 0; cnt--)
 929                                 peripheral_free(per[cnt - 1]);
 930
 931                         return ret;
 932                 }
 933         }
 934
 935         return 0;
 936 }
 937 EXPORT_SYMBOL(peripheral_request_list);
 938
 939 void peripheral_free(unsigned short per)
 940 {
 941         unsigned long flags;
 942         unsigned short ident = P_IDENT(per);
 943
 944         if (per & P_DONTCARE)
 945                 return;
 946
 947         if (!(per & P_DEFINED))
 948                 return;
 949
 950         if (check_gpio(ident) < 0)
 951                 return;
 952
 953         local_irq_save(flags);
 954
 955         if (unlikely(!(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident)))) {
 956                 local_irq_restore(flags);
 957                 return;
 958         }
 959
 960         if (!(per & P_MAYSHARE))
 961                 port_setup(ident, GPIO_USAGE);
 962
 963         reserved_peri_map[gpio_bank(ident)] &= ~gpio_bit(ident);
 964
 965         set_label(ident, "free");
 966
 967         local_irq_restore(flags);
 968 }
 969 EXPORT_SYMBOL(peripheral_free);
 970
 971 void peripheral_free_list(const unsigned short per[])
 972 {
 973         u16 cnt;
 974         for (cnt = 0; per[cnt] != 0; cnt++)
 975                 peripheral_free(per[cnt]);
 976 }
 977 EXPORT_SYMBOL(peripheral_free_list);
 978
 979 /***********************************************************
 980 *
 981 * FUNCTIONS: Blackfin GPIO Driver
 982 *
 983 * INPUTS/OUTPUTS:
 984 * gpio  PIO Number between 0 and MAX_BLACKFIN_GPIOS
 985 * label String
 986 *
 987 * DESCRIPTION: Blackfin GPIO Driver API
 988 *
 989 * CAUTION:
 990 *************************************************************
 991 * MODIFICATION HISTORY :
 992 **************************************************************/
 993
 994 int gpio_request(unsigned gpio, const char *label)
 995 {
 996         unsigned long flags;
 997
 998         if (check_gpio(gpio) < 0)
 999                 return -EINVAL;
1000
1001         local_irq_save(flags);
1002
1003         /*
1004          * Allow that the identical GPIO can
1005          * be requested from the same driver twice
1006          * Do nothing and return -
1007          */
1008
1009         if (cmp_label(gpio, label) == 0) {
1010                 local_irq_restore(flags);
1011                 return 0;
1012         }
1013
1014         if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1015                 dump_stack();
1016                 printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n",
1017                          gpio, get_label(gpio));
1018                 local_irq_restore(flags);
1019                 return -EBUSY;
1020         }
1021         if (unlikely(reserved_peri_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1022                 dump_stack();
1023                 printk(KERN_ERR
1024                        "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
1025                        gpio, get_label(gpio));
1026                 local_irq_restore(flags);
1027                 return -EBUSY;
1028         }
1029
1030         reserved_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio);
1031
1032         local_irq_restore(flags);
1033
1034         port_setup(gpio, GPIO_USAGE);
1035         set_label(gpio, label);
1036
1037         return 0;
1038 }
1039 EXPORT_SYMBOL(gpio_request);
1040
1041 void gpio_free(unsigned gpio)
1042 {
1043         unsigned long flags;
1044
1045         if (check_gpio(gpio) < 0)
1046                 return;
1047
1048         local_irq_save(flags);
1049
1050         if (unlikely(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
1051                 dump_stack();
1052                 gpio_error(gpio);
1053                 local_irq_restore(flags);
1054                 return;
1055         }
1056
1057         reserved_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
1058
1059         set_label(gpio, "free");
1060
1061         local_irq_restore(flags);
1062 }
1063 EXPORT_SYMBOL(gpio_free);
1064
1065
1066 #ifdef BF548_FAMILY
1067 int gpio_direction_input(unsigned gpio)
1068 {
1069         unsigned long flags;
1070
1071         if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1072                 gpio_error(gpio);
1073                 return -EINVAL;
1074         }
1075
1076         local_irq_save(flags);
1077         gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
1078         gpio_array[gpio_bank(gpio)]->port_inen |= gpio_bit(gpio);
1079         local_irq_restore(flags);
1080
1081         return 0;
1082 }
1083 EXPORT_SYMBOL(gpio_direction_input);
1084
1085 int gpio_direction_output(unsigned gpio, int value)
1086 {
1087         unsigned long flags;
1088
1089         if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1090                 gpio_error(gpio);
1091                 return -EINVAL;
1092         }
1093
1094         local_irq_save(flags);
1095         gpio_array[gpio_bank(gpio)]->port_inen &= ~gpio_bit(gpio);
1096         gpio_set_value(gpio, value);
1097         gpio_array[gpio_bank(gpio)]->port_dir_set = gpio_bit(gpio);
1098         local_irq_restore(flags);
1099
1100         return 0;
1101 }
1102 EXPORT_SYMBOL(gpio_direction_output);
1103
1104 void gpio_set_value(unsigned gpio, int arg)
1105 {
1106         if (arg)
1107                 gpio_array[gpio_bank(gpio)]->port_set = gpio_bit(gpio);
1108         else
1109                 gpio_array[gpio_bank(gpio)]->port_clear = gpio_bit(gpio);
1110 }
1111 EXPORT_SYMBOL(gpio_set_value);
1112
1113 int gpio_get_value(unsigned gpio)
1114 {
1115         return (1 & (gpio_array[gpio_bank(gpio)]->port_data >> gpio_sub_n(gpio)));
1116 }
1117 EXPORT_SYMBOL(gpio_get_value);
1118
1119 void bfin_gpio_irq_prepare(unsigned gpio)
1120 {
1121         unsigned long flags;
1122
1123         port_setup(gpio, GPIO_USAGE);
1124
1125         local_irq_save(flags);
1126         gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
1127         gpio_array[gpio_bank(gpio)]->port_inen |= gpio_bit(gpio);
1128         local_irq_restore(flags);
1129 }
1130
1131 #else
1132
1133 int gpio_get_value(unsigned gpio)
1134 {
1135         unsigned long flags;
1136         int ret;
1137
1138         if (unlikely(get_gpio_edge(gpio))) {
1139                 local_irq_save(flags);
1140                 set_gpio_edge(gpio, 0);
1141                 ret = get_gpio_data(gpio);
1142                 set_gpio_edge(gpio, 1);
1143                 local_irq_restore(flags);
1144
1145                 return ret;
1146         } else
1147                 return get_gpio_data(gpio);
1148 }
1149 EXPORT_SYMBOL(gpio_get_value);
1150
1151
1152 int gpio_direction_input(unsigned gpio)
1153 {
1154         unsigned long flags;
1155
1156         if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1157                 gpio_error(gpio);
1158                 return -EINVAL;
1159         }
1160
1161         local_irq_save(flags);
1162         gpio_bankb[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
1163         gpio_bankb[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
1164         AWA_DUMMY_READ(inen);
1165         local_irq_restore(flags);
1166
1167         return 0;
1168 }
1169 EXPORT_SYMBOL(gpio_direction_input);
1170
1171 int gpio_direction_output(unsigned gpio, int value)
1172 {
1173         unsigned long flags;
1174
1175         if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1176                 gpio_error(gpio);
1177                 return -EINVAL;
1178         }
1179
1180         local_irq_save(flags);
1181         gpio_bankb[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
1182
1183         if (value)
1184                 gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
1185         else
1186                 gpio_bankb[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);
1187
1188         gpio_bankb[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
1189         AWA_DUMMY_READ(dir);
1190         local_irq_restore(flags);
1191
1192         return 0;
1193 }
1194 EXPORT_SYMBOL(gpio_direction_output);
1195
1196 /* If we are booting from SPI and our board lacks a strong enough pull up,
1197  * the core can reset and execute the bootrom faster than the resistor can
1198  * pull the signal logically high.  To work around this (common) error in
1199  * board design, we explicitly set the pin back to GPIO mode, force /CS
1200  * high, and wait for the electrons to do their thing.
1201  *
1202  * This function only makes sense to be called from reset code, but it
1203  * lives here as we need to force all the GPIO states w/out going through
1204  * BUG() checks and such.
1205  */
1206 void bfin_gpio_reset_spi0_ssel1(void)
1207 {
1208         u16 gpio = P_IDENT(P_SPI0_SSEL1);
1209
1210         port_setup(gpio, GPIO_USAGE);
1211         gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
1212         AWA_DUMMY_READ(data_set);
1213         udelay(1);
1214 }
1215
1216 void bfin_gpio_irq_prepare(unsigned gpio)
1217 {
1218         port_setup(gpio, GPIO_USAGE);
1219 }
1220
1221 #endif /*BF548_FAMILY */
1222
1223 #if defined(CONFIG_PROC_FS)
1224 static int gpio_proc_read(char *buf, char **start, off_t offset,
1225                           int len, int *unused_i, void *unused_v)
1226 {
1227         int c, outlen = 0;
1228
1229         for (c = 0; c < MAX_RESOURCES; c++) {
1230                 if (!check_gpio(c) && (reserved_gpio_map[gpio_bank(c)] & gpio_bit(c)))
1231                         len = sprintf(buf, "GPIO_%d: %s \t\tGPIO %s\n", c,
1232                                  get_label(c), get_gpio_dir(c) ? "OUTPUT" : "INPUT");
1233                 else if (reserved_peri_map[gpio_bank(c)] & gpio_bit(c))
1234                         len = sprintf(buf, "GPIO_%d: %s \t\tPeripheral\n", c, get_label(c));
1235                 else
1236                         continue;
1237                 buf += len;
1238                 outlen += len;
1239         }
1240         return outlen;
1241 }
1242
1243 static __init int gpio_register_proc(void)
1244 {
1245         struct proc_dir_entry *proc_gpio;
1246
1247         proc_gpio = create_proc_entry("gpio", S_IRUGO, NULL);
1248         if (proc_gpio)
1249                 proc_gpio->read_proc = gpio_proc_read;
1250         return proc_gpio != NULL;
1251 }
1252 __initcall(gpio_register_proc);
1253 #endif