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 #if defined(BF533_FAMILY) || defined(BF538_FAMILY)
 123 static struct gpio_port_t *gpio_bankb[] = {
 124         (struct gpio_port_t *) FIO_FLAG_D,
 125 };
 126 #endif
 127
 128 #if defined(BF527_FAMILY) || defined(BF537_FAMILY) || defined(BF518_FAMILY)
 129 static struct gpio_port_t *gpio_bankb[] = {
 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[] = {
 136         (unsigned short *) PORTF_FER,
 137         (unsigned short *) PORTG_FER,
 138         (unsigned short *) PORTH_FER,
 139 };
 140 #endif
 141
 142 #if defined(BF527_FAMILY) || defined(BF518_FAMILY)
 143 static unsigned short *port_mux[] = {
 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[] = {
 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[] = {
 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_NUM];
 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)
 190 #if defined(CONFIG_BF54x)
 191 static struct gpio_port_s gpio_bank_saved[GPIO_BANK_NUM];
 192 #else
 193 static unsigned short wakeup_map[GPIO_BANK_NUM];
 194 static unsigned char wakeup_flags_map[MAX_BLACKFIN_GPIOS];
 195 static struct gpio_port_s gpio_bank_saved[GPIO_BANK_NUM];
 196
 197 #ifdef BF533_FAMILY
 198 static unsigned int sic_iwr_irqs[] = {IRQ_PROG_INTB};
 199 #endif
 200
 201 #ifdef BF537_FAMILY
 202 static unsigned int sic_iwr_irqs[] = {IRQ_PROG_INTB, IRQ_PORTG_INTB, IRQ_MAC_TX};
 203 #endif
 204
 205 #ifdef BF538_FAMILY
 206 static unsigned int sic_iwr_irqs[] = {IRQ_PORTF_INTB};
 207 #endif
 208
 209 #if defined(BF527_FAMILY) || defined(BF518_FAMILY)
 210 static unsigned int sic_iwr_irqs[] = {IRQ_PORTF_INTB, IRQ_PORTG_INTB, IRQ_PORTH_INTB};
 211 #endif
 212
 213 #ifdef BF561_FAMILY
 214 static unsigned int sic_iwr_irqs[] = {IRQ_PROG0_INTB, IRQ_PROG1_INTB, IRQ_PROG2_INTB};
 215 #endif
 216 #endif
 217 #endif /* CONFIG_PM */
 218
 219 inline int check_gpio(unsigned gpio)
 220 {
 221 #if defined(BF548_FAMILY)
 222         if (gpio == GPIO_PB15 || gpio == GPIO_PC14 || gpio == GPIO_PC15
 223             || gpio == GPIO_PH14 || gpio == GPIO_PH15
 224             || gpio == GPIO_PJ14 || gpio == GPIO_PJ15)
 225                 return -EINVAL;
 226 #endif
 227         if (gpio >= MAX_BLACKFIN_GPIOS)
 228                 return -EINVAL;
 229         return 0;
 230 }
 231
 232 static void gpio_error(unsigned gpio)
 233 {
 234         printk(KERN_ERR "bfin-gpio: GPIO %d wasn't requested!\n", gpio);
 235 }
 236
 237 static void set_label(unsigned short ident, const char *label)
 238 {
 239         if (label) {
 240                 strncpy(str_ident[ident].name, label,
 241                          RESOURCE_LABEL_SIZE);
 242                 str_ident[ident].name[RESOURCE_LABEL_SIZE - 1] = 0;
 243         }
 244 }
 245
 246 static char *get_label(unsigned short ident)
 247 {
 248         return (*str_ident[ident].name ? str_ident[ident].name : "UNKNOWN");
 249 }
 250
 251 static int cmp_label(unsigned short ident, const char *label)
 252 {
 253         if (label == NULL) {
 254                 dump_stack();
 255                 printk(KERN_ERR "Please provide none-null label\n");
 256         }
 257
 258         if (label)
 259                 return strcmp(str_ident[ident].name, label);
 260         else
 261                 return -EINVAL;
 262 }
 263
 264 static void port_setup(unsigned gpio, unsigned short usage)
 265 {
 266         if (check_gpio(gpio))
 267                 return;
 268
 269 #if defined(BF527_FAMILY) || defined(BF537_FAMILY) || defined(BF518_FAMILY)
 270         if (usage == GPIO_USAGE)
 271                 *port_fer[gpio_bank(gpio)] &= ~gpio_bit(gpio);
 272         else
 273                 *port_fer[gpio_bank(gpio)] |= gpio_bit(gpio);
 274         SSYNC();
 275 #elif defined(BF548_FAMILY)
 276         if (usage == GPIO_USAGE)
 277                 gpio_array[gpio_bank(gpio)]->port_fer &= ~gpio_bit(gpio);
 278         else
 279                 gpio_array[gpio_bank(gpio)]->port_fer |= gpio_bit(gpio);
 280         SSYNC();
 281 #endif
 282 }
 283
 284 #ifdef BF537_FAMILY
 285 static struct {
 286         unsigned short res;
 287         unsigned short offset;
 288 } port_mux_lut[] = {
 289         {.res = P_PPI0_D13, .offset = 11},
 290         {.res = P_PPI0_D14, .offset = 11},
 291         {.res = P_PPI0_D15, .offset = 11},
 292         {.res = P_SPORT1_TFS, .offset = 11},
 293         {.res = P_SPORT1_TSCLK, .offset = 11},
 294         {.res = P_SPORT1_DTPRI, .offset = 11},
 295         {.res = P_PPI0_D10, .offset = 10},
 296         {.res = P_PPI0_D11, .offset = 10},
 297         {.res = P_PPI0_D12, .offset = 10},
 298         {.res = P_SPORT1_RSCLK, .offset = 10},
 299         {.res = P_SPORT1_RFS, .offset = 10},
 300         {.res = P_SPORT1_DRPRI, .offset = 10},
 301         {.res = P_PPI0_D8, .offset = 9},
 302         {.res = P_PPI0_D9, .offset = 9},
 303         {.res = P_SPORT1_DRSEC, .offset = 9},
 304         {.res = P_SPORT1_DTSEC, .offset = 9},
 305         {.res = P_TMR2, .offset = 8},
 306         {.res = P_PPI0_FS3, .offset = 8},
 307         {.res = P_TMR3, .offset = 7},
 308         {.res = P_SPI0_SSEL4, .offset = 7},
 309         {.res = P_TMR4, .offset = 6},
 310         {.res = P_SPI0_SSEL5, .offset = 6},
 311         {.res = P_TMR5, .offset = 5},
 312         {.res = P_SPI0_SSEL6, .offset = 5},
 313         {.res = P_UART1_RX, .offset = 4},
 314         {.res = P_UART1_TX, .offset = 4},
 315         {.res = P_TMR6, .offset = 4},
 316         {.res = P_TMR7, .offset = 4},
 317         {.res = P_UART0_RX, .offset = 3},
 318         {.res = P_UART0_TX, .offset = 3},
 319         {.res = P_DMAR0, .offset = 3},
 320         {.res = P_DMAR1, .offset = 3},
 321         {.res = P_SPORT0_DTSEC, .offset = 1},
 322         {.res = P_SPORT0_DRSEC, .offset = 1},
 323         {.res = P_CAN0_RX, .offset = 1},
 324         {.res = P_CAN0_TX, .offset = 1},
 325         {.res = P_SPI0_SSEL7, .offset = 1},
 326         {.res = P_SPORT0_TFS, .offset = 0},
 327         {.res = P_SPORT0_DTPRI, .offset = 0},
 328         {.res = P_SPI0_SSEL2, .offset = 0},
 329         {.res = P_SPI0_SSEL3, .offset = 0},
 330 };
 331
 332 static void portmux_setup(unsigned short per, unsigned short function)
 333 {
 334         u16 y, offset, muxreg;
 335
 336         for (y = 0; y < ARRAY_SIZE(port_mux_lut); y++) {
 337                 if (port_mux_lut[y].res == per) {
 338
 339                         /* SET PORTMUX REG */
 340
 341                         offset = port_mux_lut[y].offset;
 342                         muxreg = bfin_read_PORT_MUX();
 343
 344                         if (offset != 1)
 345                                 muxreg &= ~(1 << offset);
 346                         else
 347                                 muxreg &= ~(3 << 1);
 348
 349                         muxreg |= (function << offset);
 350                         bfin_write_PORT_MUX(muxreg);
 351                 }
 352         }
 353 }
 354 #elif defined(BF548_FAMILY)
 355 inline void portmux_setup(unsigned short portno, unsigned short function)
 356 {
 357         u32 pmux;
 358
 359         pmux = gpio_array[gpio_bank(portno)]->port_mux;
 360
 361         pmux &= ~(0x3 << (2 * gpio_sub_n(portno)));
 362         pmux |= (function & 0x3) << (2 * gpio_sub_n(portno));
 363
 364         gpio_array[gpio_bank(portno)]->port_mux = pmux;
 365 }
 366
 367 inline u16 get_portmux(unsigned short portno)
 368 {
 369         u32 pmux;
 370
 371         pmux = gpio_array[gpio_bank(portno)]->port_mux;
 372
 373         return (pmux >> (2 * gpio_sub_n(portno)) & 0x3);
 374 }
 375 #elif defined(BF527_FAMILY) || defined(BF518_FAMILY)
 376 inline void portmux_setup(unsigned short portno, unsigned short function)
 377 {
 378         u16 pmux, ident = P_IDENT(portno);
 379         u8 offset = pmux_offset[gpio_bank(ident)][gpio_sub_n(ident)];
 380
 381         pmux = *port_mux[gpio_bank(ident)];
 382         pmux &= ~(3 << offset);
 383         pmux |= (function & 3) << offset;
 384         *port_mux[gpio_bank(ident)] = pmux;
 385         SSYNC();
 386 }
 387 #else
 388 # define portmux_setup(...)  do { } while (0)
 389 #endif
 390
 391 static int __init bfin_gpio_init(void)
 392 {
 393         printk(KERN_INFO "Blackfin GPIO Controller\n");
 394
 395         return 0;
 396 }
 397 arch_initcall(bfin_gpio_init);
 398
 399
 400 #ifndef BF548_FAMILY
 401 /***********************************************************
 402 *
 403 * FUNCTIONS: Blackfin General Purpose Ports Access Functions
 404 *
 405 * INPUTS/OUTPUTS:
 406 * gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
 407 *
 408 *
 409 * DESCRIPTION: These functions abstract direct register access
 410 *              to Blackfin processor General Purpose
 411 *              Ports Regsiters
 412 *
 413 * CAUTION: These functions do not belong to the GPIO Driver API
 414 *************************************************************
 415 * MODIFICATION HISTORY :
 416 **************************************************************/
 417
 418 /* Set a specific bit */
 419
 420 #define SET_GPIO(name) \
 421 void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
 422 { \
 423         unsigned long flags; \
 424         local_irq_save(flags); \
 425         if (arg) \
 426                 gpio_bankb[gpio_bank(gpio)]->name |= gpio_bit(gpio); \
 427         else \
 428                 gpio_bankb[gpio_bank(gpio)]->name &= ~gpio_bit(gpio); \
 429         AWA_DUMMY_READ(name); \
 430         local_irq_restore(flags); \
 431 } \
 432 EXPORT_SYMBOL(set_gpio_ ## name);
 433
 434 SET_GPIO(dir)
 435 SET_GPIO(inen)
 436 SET_GPIO(polar)
 437 SET_GPIO(edge)
 438 SET_GPIO(both)
 439
 440
 441 #if ANOMALY_05000311 || ANOMALY_05000323
 442 #define SET_GPIO_SC(name) \
 443 void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
 444 { \
 445         unsigned long flags; \
 446         local_irq_save(flags); \
 447         if (arg) \
 448                 gpio_bankb[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
 449         else \
 450                 gpio_bankb[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
 451         AWA_DUMMY_READ(name); \
 452         local_irq_restore(flags); \
 453 } \
 454 EXPORT_SYMBOL(set_gpio_ ## name);
 455 #else
 456 #define SET_GPIO_SC(name) \
 457 void set_gpio_ ## name(unsigned gpio, unsigned short arg) \
 458 { \
 459         if (arg) \
 460                 gpio_bankb[gpio_bank(gpio)]->name ## _set = gpio_bit(gpio); \
 461         else \
 462                 gpio_bankb[gpio_bank(gpio)]->name ## _clear = gpio_bit(gpio); \
 463 } \
 464 EXPORT_SYMBOL(set_gpio_ ## name);
 465 #endif
 466
 467 SET_GPIO_SC(maska)
 468 SET_GPIO_SC(maskb)
 469 SET_GPIO_SC(data)
 470
 471 #if ANOMALY_05000311 || ANOMALY_05000323
 472 void set_gpio_toggle(unsigned gpio)
 473 {
 474         unsigned long flags;
 475         local_irq_save(flags);
 476         gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
 477         AWA_DUMMY_READ(toggle);
 478         local_irq_restore(flags);
 479 }
 480 #else
 481 void set_gpio_toggle(unsigned gpio)
 482 {
 483         gpio_bankb[gpio_bank(gpio)]->toggle = gpio_bit(gpio);
 484 }
 485 #endif
 486 EXPORT_SYMBOL(set_gpio_toggle);
 487
 488
 489 /*Set current PORT date (16-bit word)*/
 490
 491 #if ANOMALY_05000311 || ANOMALY_05000323
 492 #define SET_GPIO_P(name) \
 493 void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \
 494 { \
 495         unsigned long flags; \
 496         local_irq_save(flags); \
 497         gpio_bankb[gpio_bank(gpio)]->name = arg; \
 498         AWA_DUMMY_READ(name); \
 499         local_irq_restore(flags); \
 500 } \
 501 EXPORT_SYMBOL(set_gpiop_ ## name);
 502 #else
 503 #define SET_GPIO_P(name) \
 504 void set_gpiop_ ## name(unsigned gpio, unsigned short arg) \
 505 { \
 506         gpio_bankb[gpio_bank(gpio)]->name = arg; \
 507 } \
 508 EXPORT_SYMBOL(set_gpiop_ ## name);
 509 #endif
 510
 511 SET_GPIO_P(data)
 512 SET_GPIO_P(dir)
 513 SET_GPIO_P(inen)
 514 SET_GPIO_P(polar)
 515 SET_GPIO_P(edge)
 516 SET_GPIO_P(both)
 517 SET_GPIO_P(maska)
 518 SET_GPIO_P(maskb)
 519
 520 /* Get a specific bit */
 521 #if ANOMALY_05000311 || ANOMALY_05000323
 522 #define GET_GPIO(name) \
 523 unsigned short get_gpio_ ## name(unsigned gpio) \
 524 { \
 525         unsigned long flags; \
 526         unsigned short ret; \
 527         local_irq_save(flags); \
 528         ret = 0x01 & (gpio_bankb[gpio_bank(gpio)]->name >> gpio_sub_n(gpio)); \
 529         AWA_DUMMY_READ(name); \
 530         local_irq_restore(flags); \
 531         return ret; \
 532 } \
 533 EXPORT_SYMBOL(get_gpio_ ## name);
 534 #else
 535 #define GET_GPIO(name) \
 536 unsigned short get_gpio_ ## name(unsigned gpio) \
 537 { \
 538         return (0x01 & (gpio_bankb[gpio_bank(gpio)]->name >> gpio_sub_n(gpio))); \
 539 } \
 540 EXPORT_SYMBOL(get_gpio_ ## name);
 541 #endif
 542
 543 GET_GPIO(data)
 544 GET_GPIO(dir)
 545 GET_GPIO(inen)
 546 GET_GPIO(polar)
 547 GET_GPIO(edge)
 548 GET_GPIO(both)
 549 GET_GPIO(maska)
 550 GET_GPIO(maskb)
 551
 552 /*Get current PORT date (16-bit word)*/
 553
 554 #if ANOMALY_05000311 || ANOMALY_05000323
 555 #define GET_GPIO_P(name) \
 556 unsigned short get_gpiop_ ## name(unsigned gpio) \
 557 { \
 558         unsigned long flags; \
 559         unsigned short ret; \
 560         local_irq_save(flags); \
 561         ret = (gpio_bankb[gpio_bank(gpio)]->name); \
 562         AWA_DUMMY_READ(name); \
 563         local_irq_restore(flags); \
 564         return ret; \
 565 } \
 566 EXPORT_SYMBOL(get_gpiop_ ## name);
 567 #else
 568 #define GET_GPIO_P(name) \
 569 unsigned short get_gpiop_ ## name(unsigned gpio) \
 570 { \
 571         return (gpio_bankb[gpio_bank(gpio)]->name);\
 572 } \
 573 EXPORT_SYMBOL(get_gpiop_ ## name);
 574 #endif
 575
 576 GET_GPIO_P(data)
 577 GET_GPIO_P(dir)
 578 GET_GPIO_P(inen)
 579 GET_GPIO_P(polar)
 580 GET_GPIO_P(edge)
 581 GET_GPIO_P(both)
 582 GET_GPIO_P(maska)
 583 GET_GPIO_P(maskb)
 584
 585
 586 #ifdef CONFIG_PM
 587 /***********************************************************
 588 *
 589 * FUNCTIONS: Blackfin PM Setup API
 590 *
 591 * INPUTS/OUTPUTS:
 592 * gpio - GPIO Number between 0 and MAX_BLACKFIN_GPIOS
 593 * type -
 594 *       PM_WAKE_RISING
 595 *       PM_WAKE_FALLING
 596 *       PM_WAKE_HIGH
 597 *       PM_WAKE_LOW
 598 *       PM_WAKE_BOTH_EDGES
 599 *
 600 * DESCRIPTION: Blackfin PM Driver API
 601 *
 602 * CAUTION:
 603 *************************************************************
 604 * MODIFICATION HISTORY :
 605 **************************************************************/
 606 int gpio_pm_wakeup_request(unsigned gpio, unsigned char type)
 607 {
 608         unsigned long flags;
 609
 610         if ((check_gpio(gpio) < 0) || !type)
 611                 return -EINVAL;
 612
 613         local_irq_save(flags);
 614         wakeup_map[gpio_bank(gpio)] |= gpio_bit(gpio);
 615         wakeup_flags_map[gpio] = type;
 616         local_irq_restore(flags);
 617
 618         return 0;
 619 }
 620 EXPORT_SYMBOL(gpio_pm_wakeup_request);
 621
 622 void gpio_pm_wakeup_free(unsigned gpio)
 623 {
 624         unsigned long flags;
 625
 626         if (check_gpio(gpio) < 0)
 627                 return;
 628
 629         local_irq_save(flags);
 630
 631         wakeup_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
 632
 633         local_irq_restore(flags);
 634 }
 635 EXPORT_SYMBOL(gpio_pm_wakeup_free);
 636
 637 static int bfin_gpio_wakeup_type(unsigned gpio, unsigned char type)
 638 {
 639         port_setup(gpio, GPIO_USAGE);
 640         set_gpio_dir(gpio, 0);
 641         set_gpio_inen(gpio, 1);
 642
 643         if (type & (PM_WAKE_RISING | PM_WAKE_FALLING))
 644                 set_gpio_edge(gpio, 1);
 645          else
 646                 set_gpio_edge(gpio, 0);
 647
 648         if ((type & (PM_WAKE_BOTH_EDGES)) == (PM_WAKE_BOTH_EDGES))
 649                 set_gpio_both(gpio, 1);
 650         else
 651                 set_gpio_both(gpio, 0);
 652
 653         if ((type & (PM_WAKE_FALLING | PM_WAKE_LOW)))
 654                 set_gpio_polar(gpio, 1);
 655         else
 656                 set_gpio_polar(gpio, 0);
 657
 658         SSYNC();
 659
 660         return 0;
 661 }
 662
 663 u32 bfin_pm_standby_setup(void)
 664 {
 665         u16 bank, mask, i, gpio;
 666
 667         for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
 668                 mask = wakeup_map[gpio_bank(i)];
 669                 bank = gpio_bank(i);
 670
 671                 gpio_bank_saved[bank].maskb = gpio_bankb[bank]->maskb;
 672                 gpio_bankb[bank]->maskb = 0;
 673
 674                 if (mask) {
 675 #if defined(BF527_FAMILY) || defined(BF537_FAMILY) || defined(BF518_FAMILY)
 676                         gpio_bank_saved[bank].fer   = *port_fer[bank];
 677 #endif
 678                         gpio_bank_saved[bank].inen  = gpio_bankb[bank]->inen;
 679                         gpio_bank_saved[bank].polar = gpio_bankb[bank]->polar;
 680                         gpio_bank_saved[bank].dir   = gpio_bankb[bank]->dir;
 681                         gpio_bank_saved[bank].edge  = gpio_bankb[bank]->edge;
 682                         gpio_bank_saved[bank].both  = gpio_bankb[bank]->both;
 683                         gpio_bank_saved[bank].reserved =
 684                                                 reserved_gpio_map[bank];
 685
 686                         gpio = i;
 687
 688                         while (mask) {
 689                                 if ((mask & 1) && (wakeup_flags_map[gpio] !=
 690                                         PM_WAKE_IGNORE)) {
 691                                         reserved_gpio_map[gpio_bank(gpio)] |=
 692                                                         gpio_bit(gpio);
 693                                         bfin_gpio_wakeup_type(gpio,
 694                                                 wakeup_flags_map[gpio]);
 695                                         set_gpio_data(gpio, 0); /*Clear*/
 696                                 }
 697                                 gpio++;
 698                                 mask >>= 1;
 699                         }
 700
 701                         bfin_internal_set_wake(sic_iwr_irqs[bank], 1);
 702                         gpio_bankb[bank]->maskb_set = wakeup_map[gpio_bank(i)];
 703                 }
 704         }
 705
 706         AWA_DUMMY_READ(maskb_set);
 707
 708         return 0;
 709 }
 710
 711 void bfin_pm_standby_restore(void)
 712 {
 713         u16 bank, mask, i;
 714
 715         for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
 716                 mask = wakeup_map[gpio_bank(i)];
 717                 bank = gpio_bank(i);
 718
 719                 if (mask) {
 720 #if defined(BF527_FAMILY) || defined(BF537_FAMILY) || defined(BF518_FAMILY)
 721                         *port_fer[bank]         = gpio_bank_saved[bank].fer;
 722 #endif
 723                         gpio_bankb[bank]->inen  = gpio_bank_saved[bank].inen;
 724                         gpio_bankb[bank]->dir   = gpio_bank_saved[bank].dir;
 725                         gpio_bankb[bank]->polar = gpio_bank_saved[bank].polar;
 726                         gpio_bankb[bank]->edge  = gpio_bank_saved[bank].edge;
 727                         gpio_bankb[bank]->both  = gpio_bank_saved[bank].both;
 728
 729                         reserved_gpio_map[bank] =
 730                                         gpio_bank_saved[bank].reserved;
 731                         bfin_internal_set_wake(sic_iwr_irqs[bank], 0);
 732                 }
 733
 734                 gpio_bankb[bank]->maskb = gpio_bank_saved[bank].maskb;
 735         }
 736         AWA_DUMMY_READ(maskb);
 737 }
 738
 739 void bfin_gpio_pm_hibernate_suspend(void)
 740 {
 741         int i, bank;
 742
 743         for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
 744                 bank = gpio_bank(i);
 745
 746 #if defined(BF527_FAMILY) || defined(BF537_FAMILY) || defined(BF518_FAMILY)
 747                         gpio_bank_saved[bank].fer   = *port_fer[bank];
 748 #if defined(BF527_FAMILY) || defined(BF518_FAMILY)
 749                         gpio_bank_saved[bank].mux   = *port_mux[bank];
 750 #else
 751                         if (bank == 0)
 752                                 gpio_bank_saved[bank].mux   = bfin_read_PORT_MUX();
 753 #endif
 754 #endif
 755                         gpio_bank_saved[bank].data  = gpio_bankb[bank]->data;
 756                         gpio_bank_saved[bank].inen  = gpio_bankb[bank]->inen;
 757                         gpio_bank_saved[bank].polar = gpio_bankb[bank]->polar;
 758                         gpio_bank_saved[bank].dir   = gpio_bankb[bank]->dir;
 759                         gpio_bank_saved[bank].edge  = gpio_bankb[bank]->edge;
 760                         gpio_bank_saved[bank].both  = gpio_bankb[bank]->both;
 761                         gpio_bank_saved[bank].maska  = gpio_bankb[bank]->maska;
 762         }
 763
 764         AWA_DUMMY_READ(maska);
 765 }
 766
 767 void bfin_gpio_pm_hibernate_restore(void)
 768 {
 769         int i, bank;
 770
 771         for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
 772                         bank = gpio_bank(i);
 773
 774 #if defined(BF527_FAMILY) || defined(BF537_FAMILY) || defined(BF518_FAMILY)
 775 #if defined(BF527_FAMILY) || defined(BF518_FAMILY)
 776                         *port_mux[bank] = gpio_bank_saved[bank].mux;
 777 #else
 778                         if (bank == 0)
 779                                 bfin_write_PORT_MUX(gpio_bank_saved[bank].mux);
 780 #endif
 781                         *port_fer[bank]         = gpio_bank_saved[bank].fer;
 782 #endif
 783                         gpio_bankb[bank]->inen  = gpio_bank_saved[bank].inen;
 784                         gpio_bankb[bank]->dir   = gpio_bank_saved[bank].dir;
 785                         gpio_bankb[bank]->polar = gpio_bank_saved[bank].polar;
 786                         gpio_bankb[bank]->edge  = gpio_bank_saved[bank].edge;
 787                         gpio_bankb[bank]->both  = gpio_bank_saved[bank].both;
 788
 789                         gpio_bankb[bank]->data_set = gpio_bank_saved[bank].data
 790                                                         | gpio_bank_saved[bank].dir;
 791
 792                         gpio_bankb[bank]->maska = gpio_bank_saved[bank].maska;
 793         }
 794         AWA_DUMMY_READ(maska);
 795 }
 796
 797
 798 #endif
 799 #else /* BF548_FAMILY */
 800 #ifdef CONFIG_PM
 801
 802 u32 bfin_pm_standby_setup(void)
 803 {
 804         return 0;
 805 }
 806
 807 void bfin_pm_standby_restore(void)
 808 {
 809
 810 }
 811
 812 void bfin_gpio_pm_hibernate_suspend(void)
 813 {
 814         int i, bank;
 815
 816         for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
 817                 bank = gpio_bank(i);
 818
 819                         gpio_bank_saved[bank].fer  = gpio_array[bank]->port_fer;
 820                         gpio_bank_saved[bank].mux  = gpio_array[bank]->port_mux;
 821                         gpio_bank_saved[bank].data  = gpio_array[bank]->port_data;
 822                         gpio_bank_saved[bank].data  = gpio_array[bank]->port_data;
 823                         gpio_bank_saved[bank].inen  = gpio_array[bank]->port_inen;
 824                         gpio_bank_saved[bank].dir   = gpio_array[bank]->port_dir_set;
 825         }
 826 }
 827
 828 void bfin_gpio_pm_hibernate_restore(void)
 829 {
 830         int i, bank;
 831
 832         for (i = 0; i < MAX_BLACKFIN_GPIOS; i += GPIO_BANKSIZE) {
 833                         bank = gpio_bank(i);
 834
 835                         gpio_array[bank]->port_mux  = gpio_bank_saved[bank].mux;
 836                         gpio_array[bank]->port_fer  = gpio_bank_saved[bank].fer;
 837                         gpio_array[bank]->port_inen  = gpio_bank_saved[bank].inen;
 838                         gpio_array[bank]->port_dir_set   = gpio_bank_saved[bank].dir;
 839                         gpio_array[bank]->port_set = gpio_bank_saved[bank].data
 840                                                         | gpio_bank_saved[bank].dir;
 841         }
 842 }
 843 #endif
 844
 845 unsigned short get_gpio_dir(unsigned gpio)
 846 {
 847         return (0x01 & (gpio_array[gpio_bank(gpio)]->port_dir_clear >> gpio_sub_n(gpio)));
 848 }
 849 EXPORT_SYMBOL(get_gpio_dir);
 850
 851 #endif /* BF548_FAMILY */
 852
 853 /***********************************************************
 854 *
 855 * FUNCTIONS:    Blackfin Peripheral Resource Allocation
 856 *               and PortMux Setup
 857 *
 858 * INPUTS/OUTPUTS:
 859 * per   Peripheral Identifier
 860 * label String
 861 *
 862 * DESCRIPTION: Blackfin Peripheral Resource Allocation and Setup API
 863 *
 864 * CAUTION:
 865 *************************************************************
 866 * MODIFICATION HISTORY :
 867 **************************************************************/
 868
 869 int peripheral_request(unsigned short per, const char *label)
 870 {
 871         unsigned long flags;
 872         unsigned short ident = P_IDENT(per);
 873
 874         /*
 875          * Don't cares are pins with only one dedicated function
 876          */
 877
 878         if (per & P_DONTCARE)
 879                 return 0;
 880
 881         if (!(per & P_DEFINED))
 882                 return -ENODEV;
 883
 884         local_irq_save(flags);
 885
 886         /* If a pin can be muxed as either GPIO or peripheral, make
 887          * sure it is not already a GPIO pin when we request it.
 888          */
 889         if (unlikely(!check_gpio(ident) &&
 890             reserved_gpio_map[gpio_bank(ident)] & gpio_bit(ident))) {
 891                 dump_stack();
 892                 printk(KERN_ERR
 893                        "%s: Peripheral %d is already reserved as GPIO by %s !\n",
 894                        __func__, ident, get_label(ident));
 895                 local_irq_restore(flags);
 896                 return -EBUSY;
 897         }
 898
 899         if (unlikely(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident))) {
 900
 901                 /*
 902                  * Pin functions like AMC address strobes my
 903                  * be requested and used by several drivers
 904                  */
 905
 906 #ifdef BF548_FAMILY
 907                 u16 funct = get_portmux(ident);
 908
 909                 if (!((per & P_MAYSHARE) && (funct == P_FUNCT2MUX(per)))) {
 910 #else
 911                 if (!(per & P_MAYSHARE)) {
 912 #endif
 913                         /*
 914                          * Allow that the identical pin function can
 915                          * be requested from the same driver twice
 916                          */
 917
 918                         if (cmp_label(ident, label) == 0)
 919                                 goto anyway;
 920
 921                         dump_stack();
 922                         printk(KERN_ERR
 923                                "%s: Peripheral %d function %d is already reserved by %s !\n",
 924                                __func__, ident, P_FUNCT2MUX(per), get_label(ident));
 925                         local_irq_restore(flags);
 926                         return -EBUSY;
 927                 }
 928         }
 929
 930  anyway:
 931         reserved_peri_map[gpio_bank(ident)] |= gpio_bit(ident);
 932
 933 #ifdef BF548_FAMILY
 934         portmux_setup(ident, P_FUNCT2MUX(per));
 935 #else
 936         portmux_setup(per, P_FUNCT2MUX(per));
 937 #endif
 938         port_setup(ident, PERIPHERAL_USAGE);
 939
 940         local_irq_restore(flags);
 941         set_label(ident, label);
 942
 943         return 0;
 944 }
 945 EXPORT_SYMBOL(peripheral_request);
 946
 947 int peripheral_request_list(const unsigned short per[], const char *label)
 948 {
 949         u16 cnt;
 950         int ret;
 951
 952         for (cnt = 0; per[cnt] != 0; cnt++) {
 953
 954                 ret = peripheral_request(per[cnt], label);
 955
 956                 if (ret < 0) {
 957                         for ( ; cnt > 0; cnt--)
 958                                 peripheral_free(per[cnt - 1]);
 959
 960                         return ret;
 961                 }
 962         }
 963
 964         return 0;
 965 }
 966 EXPORT_SYMBOL(peripheral_request_list);
 967
 968 void peripheral_free(unsigned short per)
 969 {
 970         unsigned long flags;
 971         unsigned short ident = P_IDENT(per);
 972
 973         if (per & P_DONTCARE)
 974                 return;
 975
 976         if (!(per & P_DEFINED))
 977                 return;
 978
 979         if (check_gpio(ident) < 0)
 980                 return;
 981
 982         local_irq_save(flags);
 983
 984         if (unlikely(!(reserved_peri_map[gpio_bank(ident)] & gpio_bit(ident)))) {
 985                 local_irq_restore(flags);
 986                 return;
 987         }
 988
 989         if (!(per & P_MAYSHARE))
 990                 port_setup(ident, GPIO_USAGE);
 991
 992         reserved_peri_map[gpio_bank(ident)] &= ~gpio_bit(ident);
 993
 994         set_label(ident, "free");
 995
 996         local_irq_restore(flags);
 997 }
 998 EXPORT_SYMBOL(peripheral_free);
 999
1000 void peripheral_free_list(const unsigned short per[])
1001 {
1002         u16 cnt;
1003         for (cnt = 0; per[cnt] != 0; cnt++)
1004                 peripheral_free(per[cnt]);
1005 }
1006 EXPORT_SYMBOL(peripheral_free_list);
1007
1008 /***********************************************************
1009 *
1010 * FUNCTIONS: Blackfin GPIO Driver
1011 *
1012 * INPUTS/OUTPUTS:
1013 * gpio  PIO Number between 0 and MAX_BLACKFIN_GPIOS
1014 * label String
1015 *
1016 * DESCRIPTION: Blackfin GPIO Driver API
1017 *
1018 * CAUTION:
1019 *************************************************************
1020 * MODIFICATION HISTORY :
1021 **************************************************************/
1022
1023 int gpio_request(unsigned gpio, const char *label)
1024 {
1025         unsigned long flags;
1026
1027         if (check_gpio(gpio) < 0)
1028                 return -EINVAL;
1029
1030         local_irq_save(flags);
1031
1032         /*
1033          * Allow that the identical GPIO can
1034          * be requested from the same driver twice
1035          * Do nothing and return -
1036          */
1037
1038         if (cmp_label(gpio, label) == 0) {
1039                 local_irq_restore(flags);
1040                 return 0;
1041         }
1042
1043         if (unlikely(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1044                 dump_stack();
1045                 printk(KERN_ERR "bfin-gpio: GPIO %d is already reserved by %s !\n",
1046                          gpio, get_label(gpio));
1047                 local_irq_restore(flags);
1048                 return -EBUSY;
1049         }
1050         if (unlikely(reserved_peri_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1051                 dump_stack();
1052                 printk(KERN_ERR
1053                        "bfin-gpio: GPIO %d is already reserved as Peripheral by %s !\n",
1054                        gpio, get_label(gpio));
1055                 local_irq_restore(flags);
1056                 return -EBUSY;
1057         }
1058
1059         reserved_gpio_map[gpio_bank(gpio)] |= gpio_bit(gpio);
1060
1061         local_irq_restore(flags);
1062
1063         port_setup(gpio, GPIO_USAGE);
1064         set_label(gpio, label);
1065
1066         return 0;
1067 }
1068 EXPORT_SYMBOL(gpio_request);
1069
1070 void gpio_free(unsigned gpio)
1071 {
1072         unsigned long flags;
1073
1074         if (check_gpio(gpio) < 0)
1075                 return;
1076
1077         local_irq_save(flags);
1078
1079         if (unlikely(!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio)))) {
1080                 dump_stack();
1081                 gpio_error(gpio);
1082                 local_irq_restore(flags);
1083                 return;
1084         }
1085
1086         reserved_gpio_map[gpio_bank(gpio)] &= ~gpio_bit(gpio);
1087
1088         set_label(gpio, "free");
1089
1090         local_irq_restore(flags);
1091 }
1092 EXPORT_SYMBOL(gpio_free);
1093
1094
1095 #ifdef BF548_FAMILY
1096 int gpio_direction_input(unsigned gpio)
1097 {
1098         unsigned long flags;
1099
1100         if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1101                 gpio_error(gpio);
1102                 return -EINVAL;
1103         }
1104
1105         local_irq_save(flags);
1106         gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
1107         gpio_array[gpio_bank(gpio)]->port_inen |= gpio_bit(gpio);
1108         local_irq_restore(flags);
1109
1110         return 0;
1111 }
1112 EXPORT_SYMBOL(gpio_direction_input);
1113
1114 int gpio_direction_output(unsigned gpio, int value)
1115 {
1116         unsigned long flags;
1117
1118         if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1119                 gpio_error(gpio);
1120                 return -EINVAL;
1121         }
1122
1123         local_irq_save(flags);
1124         gpio_array[gpio_bank(gpio)]->port_inen &= ~gpio_bit(gpio);
1125         gpio_set_value(gpio, value);
1126         gpio_array[gpio_bank(gpio)]->port_dir_set = gpio_bit(gpio);
1127         local_irq_restore(flags);
1128
1129         return 0;
1130 }
1131 EXPORT_SYMBOL(gpio_direction_output);
1132
1133 void gpio_set_value(unsigned gpio, int arg)
1134 {
1135         if (arg)
1136                 gpio_array[gpio_bank(gpio)]->port_set = gpio_bit(gpio);
1137         else
1138                 gpio_array[gpio_bank(gpio)]->port_clear = gpio_bit(gpio);
1139 }
1140 EXPORT_SYMBOL(gpio_set_value);
1141
1142 int gpio_get_value(unsigned gpio)
1143 {
1144         return (1 & (gpio_array[gpio_bank(gpio)]->port_data >> gpio_sub_n(gpio)));
1145 }
1146 EXPORT_SYMBOL(gpio_get_value);
1147
1148 void bfin_gpio_irq_prepare(unsigned gpio)
1149 {
1150         unsigned long flags;
1151
1152         port_setup(gpio, GPIO_USAGE);
1153
1154         local_irq_save(flags);
1155         gpio_array[gpio_bank(gpio)]->port_dir_clear = gpio_bit(gpio);
1156         gpio_array[gpio_bank(gpio)]->port_inen |= gpio_bit(gpio);
1157         local_irq_restore(flags);
1158 }
1159
1160 #else
1161
1162 int gpio_get_value(unsigned gpio)
1163 {
1164         unsigned long flags;
1165         int ret;
1166
1167         if (unlikely(get_gpio_edge(gpio))) {
1168                 local_irq_save(flags);
1169                 set_gpio_edge(gpio, 0);
1170                 ret = get_gpio_data(gpio);
1171                 set_gpio_edge(gpio, 1);
1172                 local_irq_restore(flags);
1173
1174                 return ret;
1175         } else
1176                 return get_gpio_data(gpio);
1177 }
1178 EXPORT_SYMBOL(gpio_get_value);
1179
1180
1181 int gpio_direction_input(unsigned gpio)
1182 {
1183         unsigned long flags;
1184
1185         if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1186                 gpio_error(gpio);
1187                 return -EINVAL;
1188         }
1189
1190         local_irq_save(flags);
1191         gpio_bankb[gpio_bank(gpio)]->dir &= ~gpio_bit(gpio);
1192         gpio_bankb[gpio_bank(gpio)]->inen |= gpio_bit(gpio);
1193         AWA_DUMMY_READ(inen);
1194         local_irq_restore(flags);
1195
1196         return 0;
1197 }
1198 EXPORT_SYMBOL(gpio_direction_input);
1199
1200 int gpio_direction_output(unsigned gpio, int value)
1201 {
1202         unsigned long flags;
1203
1204         if (!(reserved_gpio_map[gpio_bank(gpio)] & gpio_bit(gpio))) {
1205                 gpio_error(gpio);
1206                 return -EINVAL;
1207         }
1208
1209         local_irq_save(flags);
1210         gpio_bankb[gpio_bank(gpio)]->inen &= ~gpio_bit(gpio);
1211
1212         if (value)
1213                 gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
1214         else
1215                 gpio_bankb[gpio_bank(gpio)]->data_clear = gpio_bit(gpio);
1216
1217         gpio_bankb[gpio_bank(gpio)]->dir |= gpio_bit(gpio);
1218         AWA_DUMMY_READ(dir);
1219         local_irq_restore(flags);
1220
1221         return 0;
1222 }
1223 EXPORT_SYMBOL(gpio_direction_output);
1224
1225 /* If we are booting from SPI and our board lacks a strong enough pull up,
1226  * the core can reset and execute the bootrom faster than the resistor can
1227  * pull the signal logically high.  To work around this (common) error in
1228  * board design, we explicitly set the pin back to GPIO mode, force /CS
1229  * high, and wait for the electrons to do their thing.
1230  *
1231  * This function only makes sense to be called from reset code, but it
1232  * lives here as we need to force all the GPIO states w/out going through
1233  * BUG() checks and such.
1234  */
1235 void bfin_gpio_reset_spi0_ssel1(void)
1236 {
1237         u16 gpio = P_IDENT(P_SPI0_SSEL1);
1238
1239         port_setup(gpio, GPIO_USAGE);
1240         gpio_bankb[gpio_bank(gpio)]->data_set = gpio_bit(gpio);
1241         AWA_DUMMY_READ(data_set);
1242         udelay(1);
1243 }
1244
1245 void bfin_gpio_irq_prepare(unsigned gpio)
1246 {
1247         port_setup(gpio, GPIO_USAGE);
1248 }
1249
1250 #endif /*BF548_FAMILY */
1251
1252 #if defined(CONFIG_PROC_FS)
1253 static int gpio_proc_read(char *buf, char **start, off_t offset,
1254                           int len, int *unused_i, void *unused_v)
1255 {
1256         int c, outlen = 0;
1257
1258         for (c = 0; c < MAX_RESOURCES; c++) {
1259                 if (!check_gpio(c) && (reserved_gpio_map[gpio_bank(c)] & gpio_bit(c)))
1260                         len = sprintf(buf, "GPIO_%d: %s \t\tGPIO %s\n", c,
1261                                  get_label(c), get_gpio_dir(c) ? "OUTPUT" : "INPUT");
1262                 else if (reserved_peri_map[gpio_bank(c)] & gpio_bit(c))
1263                         len = sprintf(buf, "GPIO_%d: %s \t\tPeripheral\n", c, get_label(c));
1264                 else
1265                         continue;
1266                 buf += len;
1267                 outlen += len;
1268         }
1269         return outlen;
1270 }
1271
1272 static __init int gpio_register_proc(void)
1273 {
1274         struct proc_dir_entry *proc_gpio;
1275
1276         proc_gpio = create_proc_entry("gpio", S_IRUGO, NULL);
1277         if (proc_gpio)
1278                 proc_gpio->read_proc = gpio_proc_read;
1279         return proc_gpio != NULL;
1280 }
1281 __initcall(gpio_register_proc);
1282 #endif