arch/arm/plat-omap/gpio.c

   1 /*
   2  *  linux/arch/arm/plat-omap/gpio.c
   3  *
   4  * Support functions for OMAP GPIO
   5  *
   6  * Copyright (C) 2003-2005 Nokia Corporation
   7  * Written by Juha Yrjölä <juha.yrjola@nokia.com>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16 #include <linux/sched.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/ptrace.h>
  19 #include <linux/sysdev.h>
  20 #include <linux/err.h>
  21 #include <linux/clk.h>
  22
  23 #include <asm/hardware.h>
  24 #include <asm/irq.h>
  25 #include <asm/arch/irqs.h>
  26 #include <asm/arch/gpio.h>
  27 #include <asm/mach/irq.h>
  28
  29 #include <asm/io.h>
  30
  31 /*
  32  * OMAP1510 GPIO registers
  33  */
  34 #define OMAP1510_GPIO_BASE              (void __iomem *)0xfffce000
  35 #define OMAP1510_GPIO_DATA_INPUT        0x00
  36 #define OMAP1510_GPIO_DATA_OUTPUT       0x04
  37 #define OMAP1510_GPIO_DIR_CONTROL       0x08
  38 #define OMAP1510_GPIO_INT_CONTROL       0x0c
  39 #define OMAP1510_GPIO_INT_MASK          0x10
  40 #define OMAP1510_GPIO_INT_STATUS        0x14
  41 #define OMAP1510_GPIO_PIN_CONTROL       0x18
  42
  43 #define OMAP1510_IH_GPIO_BASE           64
  44
  45 /*
  46  * OMAP1610 specific GPIO registers
  47  */
  48 #define OMAP1610_GPIO1_BASE             (void __iomem *)0xfffbe400
  49 #define OMAP1610_GPIO2_BASE             (void __iomem *)0xfffbec00
  50 #define OMAP1610_GPIO3_BASE             (void __iomem *)0xfffbb400
  51 #define OMAP1610_GPIO4_BASE             (void __iomem *)0xfffbbc00
  52 #define OMAP1610_GPIO_REVISION          0x0000
  53 #define OMAP1610_GPIO_SYSCONFIG         0x0010
  54 #define OMAP1610_GPIO_SYSSTATUS         0x0014
  55 #define OMAP1610_GPIO_IRQSTATUS1        0x0018
  56 #define OMAP1610_GPIO_IRQENABLE1        0x001c
  57 #define OMAP1610_GPIO_WAKEUPENABLE      0x0028
  58 #define OMAP1610_GPIO_DATAIN            0x002c
  59 #define OMAP1610_GPIO_DATAOUT           0x0030
  60 #define OMAP1610_GPIO_DIRECTION         0x0034
  61 #define OMAP1610_GPIO_EDGE_CTRL1        0x0038
  62 #define OMAP1610_GPIO_EDGE_CTRL2        0x003c
  63 #define OMAP1610_GPIO_CLEAR_IRQENABLE1  0x009c
  64 #define OMAP1610_GPIO_CLEAR_WAKEUPENA   0x00a8
  65 #define OMAP1610_GPIO_CLEAR_DATAOUT     0x00b0
  66 #define OMAP1610_GPIO_SET_IRQENABLE1    0x00dc
  67 #define OMAP1610_GPIO_SET_WAKEUPENA     0x00e8
  68 #define OMAP1610_GPIO_SET_DATAOUT       0x00f0
  69
  70 /*
  71  * OMAP730 specific GPIO registers
  72  */
  73 #define OMAP730_GPIO1_BASE              (void __iomem *)0xfffbc000
  74 #define OMAP730_GPIO2_BASE              (void __iomem *)0xfffbc800
  75 #define OMAP730_GPIO3_BASE              (void __iomem *)0xfffbd000
  76 #define OMAP730_GPIO4_BASE              (void __iomem *)0xfffbd800
  77 #define OMAP730_GPIO5_BASE              (void __iomem *)0xfffbe000
  78 #define OMAP730_GPIO6_BASE              (void __iomem *)0xfffbe800
  79 #define OMAP730_GPIO_DATA_INPUT         0x00
  80 #define OMAP730_GPIO_DATA_OUTPUT        0x04
  81 #define OMAP730_GPIO_DIR_CONTROL        0x08
  82 #define OMAP730_GPIO_INT_CONTROL        0x0c
  83 #define OMAP730_GPIO_INT_MASK           0x10
  84 #define OMAP730_GPIO_INT_STATUS         0x14
  85
  86 /*
  87  * omap24xx specific GPIO registers
  88  */
  89 #define OMAP24XX_GPIO1_BASE             (void __iomem *)0x48018000
  90 #define OMAP24XX_GPIO2_BASE             (void __iomem *)0x4801a000
  91 #define OMAP24XX_GPIO3_BASE             (void __iomem *)0x4801c000
  92 #define OMAP24XX_GPIO4_BASE             (void __iomem *)0x4801e000
  93 #define OMAP24XX_GPIO_REVISION          0x0000
  94 #define OMAP24XX_GPIO_SYSCONFIG         0x0010
  95 #define OMAP24XX_GPIO_SYSSTATUS         0x0014
  96 #define OMAP24XX_GPIO_IRQSTATUS1        0x0018
  97 #define OMAP24XX_GPIO_IRQENABLE1        0x001c
  98 #define OMAP24XX_GPIO_CTRL              0x0030
  99 #define OMAP24XX_GPIO_OE                0x0034
 100 #define OMAP24XX_GPIO_DATAIN            0x0038
 101 #define OMAP24XX_GPIO_DATAOUT           0x003c
 102 #define OMAP24XX_GPIO_LEVELDETECT0      0x0040
 103 #define OMAP24XX_GPIO_LEVELDETECT1      0x0044
 104 #define OMAP24XX_GPIO_RISINGDETECT      0x0048
 105 #define OMAP24XX_GPIO_FALLINGDETECT     0x004c
 106 #define OMAP24XX_GPIO_CLEARIRQENABLE1   0x0060
 107 #define OMAP24XX_GPIO_SETIRQENABLE1     0x0064
 108 #define OMAP24XX_GPIO_CLEARWKUENA       0x0080
 109 #define OMAP24XX_GPIO_SETWKUENA         0x0084
 110 #define OMAP24XX_GPIO_CLEARDATAOUT      0x0090
 111 #define OMAP24XX_GPIO_SETDATAOUT        0x0094
 112
 113 #define OMAP_MPUIO_MASK         (~OMAP_MAX_GPIO_LINES & 0xff)
 114
 115 struct gpio_bank {
 116         void __iomem *base;
 117         u16 irq;
 118         u16 virtual_irq_start;
 119         int method;
 120         u32 reserved_map;
 121         u32 suspend_wakeup;
 122         u32 saved_wakeup;
 123         spinlock_t lock;
 124 };
 125
 126 #define METHOD_MPUIO            0
 127 #define METHOD_GPIO_1510        1
 128 #define METHOD_GPIO_1610        2
 129 #define METHOD_GPIO_730         3
 130 #define METHOD_GPIO_24XX        4
 131
 132 #ifdef CONFIG_ARCH_OMAP16XX
 133 static struct gpio_bank gpio_bank_1610[5] = {
 134         { OMAP_MPUIO_BASE,     INT_MPUIO,           IH_MPUIO_BASE,     METHOD_MPUIO},
 135         { OMAP1610_GPIO1_BASE, INT_GPIO_BANK1,      IH_GPIO_BASE,      METHOD_GPIO_1610 },
 136         { OMAP1610_GPIO2_BASE, INT_1610_GPIO_BANK2, IH_GPIO_BASE + 16, METHOD_GPIO_1610 },
 137         { OMAP1610_GPIO3_BASE, INT_1610_GPIO_BANK3, IH_GPIO_BASE + 32, METHOD_GPIO_1610 },
 138         { OMAP1610_GPIO4_BASE, INT_1610_GPIO_BANK4, IH_GPIO_BASE + 48, METHOD_GPIO_1610 },
 139 };
 140 #endif
 141
 142 #ifdef CONFIG_ARCH_OMAP15XX
 143 static struct gpio_bank gpio_bank_1510[2] = {
 144         { OMAP_MPUIO_BASE,    INT_MPUIO,      IH_MPUIO_BASE, METHOD_MPUIO },
 145         { OMAP1510_GPIO_BASE, INT_GPIO_BANK1, IH_GPIO_BASE,  METHOD_GPIO_1510 }
 146 };
 147 #endif
 148
 149 #ifdef CONFIG_ARCH_OMAP730
 150 static struct gpio_bank gpio_bank_730[7] = {
 151         { OMAP_MPUIO_BASE,     INT_730_MPUIO,       IH_MPUIO_BASE,      METHOD_MPUIO },
 152         { OMAP730_GPIO1_BASE,  INT_730_GPIO_BANK1,  IH_GPIO_BASE,       METHOD_GPIO_730 },
 153         { OMAP730_GPIO2_BASE,  INT_730_GPIO_BANK2,  IH_GPIO_BASE + 32,  METHOD_GPIO_730 },
 154         { OMAP730_GPIO3_BASE,  INT_730_GPIO_BANK3,  IH_GPIO_BASE + 64,  METHOD_GPIO_730 },
 155         { OMAP730_GPIO4_BASE,  INT_730_GPIO_BANK4,  IH_GPIO_BASE + 96,  METHOD_GPIO_730 },
 156         { OMAP730_GPIO5_BASE,  INT_730_GPIO_BANK5,  IH_GPIO_BASE + 128, METHOD_GPIO_730 },
 157         { OMAP730_GPIO6_BASE,  INT_730_GPIO_BANK6,  IH_GPIO_BASE + 160, METHOD_GPIO_730 },
 158 };
 159 #endif
 160
 161 #ifdef CONFIG_ARCH_OMAP24XX
 162 static struct gpio_bank gpio_bank_24xx[4] = {
 163         { OMAP24XX_GPIO1_BASE, INT_24XX_GPIO_BANK1, IH_GPIO_BASE,       METHOD_GPIO_24XX },
 164         { OMAP24XX_GPIO2_BASE, INT_24XX_GPIO_BANK2, IH_GPIO_BASE + 32,  METHOD_GPIO_24XX },
 165         { OMAP24XX_GPIO3_BASE, INT_24XX_GPIO_BANK3, IH_GPIO_BASE + 64,  METHOD_GPIO_24XX },
 166         { OMAP24XX_GPIO4_BASE, INT_24XX_GPIO_BANK4, IH_GPIO_BASE + 96,  METHOD_GPIO_24XX },
 167 };
 168 #endif
 169
 170 static struct gpio_bank *gpio_bank;
 171 static int gpio_bank_count;
 172
 173 static inline struct gpio_bank *get_gpio_bank(int gpio)
 174 {
 175 #ifdef CONFIG_ARCH_OMAP15XX
 176         if (cpu_is_omap15xx()) {
 177                 if (OMAP_GPIO_IS_MPUIO(gpio))
 178                         return &gpio_bank[0];
 179                 return &gpio_bank[1];
 180         }
 181 #endif
 182 #if defined(CONFIG_ARCH_OMAP16XX)
 183         if (cpu_is_omap16xx()) {
 184                 if (OMAP_GPIO_IS_MPUIO(gpio))
 185                         return &gpio_bank[0];
 186                 return &gpio_bank[1 + (gpio >> 4)];
 187         }
 188 #endif
 189 #ifdef CONFIG_ARCH_OMAP730
 190         if (cpu_is_omap730()) {
 191                 if (OMAP_GPIO_IS_MPUIO(gpio))
 192                         return &gpio_bank[0];
 193                 return &gpio_bank[1 + (gpio >> 5)];
 194         }
 195 #endif
 196 #ifdef CONFIG_ARCH_OMAP24XX
 197         if (cpu_is_omap24xx())
 198                 return &gpio_bank[gpio >> 5];
 199 #endif
 200 }
 201
 202 static inline int get_gpio_index(int gpio)
 203 {
 204 #ifdef CONFIG_ARCH_OMAP730
 205         if (cpu_is_omap730())
 206                 return gpio & 0x1f;
 207 #endif
 208 #ifdef CONFIG_ARCH_OMAP24XX
 209         if (cpu_is_omap24xx())
 210                 return gpio & 0x1f;
 211 #endif
 212         return gpio & 0x0f;
 213 }
 214
 215 static inline int gpio_valid(int gpio)
 216 {
 217         if (gpio < 0)
 218                 return -1;
 219         if (OMAP_GPIO_IS_MPUIO(gpio)) {
 220                 if ((gpio & OMAP_MPUIO_MASK) > 16)
 221                         return -1;
 222                 return 0;
 223         }
 224 #ifdef CONFIG_ARCH_OMAP15XX
 225         if (cpu_is_omap15xx() && gpio < 16)
 226                 return 0;
 227 #endif
 228 #if defined(CONFIG_ARCH_OMAP16XX)
 229         if ((cpu_is_omap16xx()) && gpio < 64)
 230                 return 0;
 231 #endif
 232 #ifdef CONFIG_ARCH_OMAP730
 233         if (cpu_is_omap730() && gpio < 192)
 234                 return 0;
 235 #endif
 236 #ifdef CONFIG_ARCH_OMAP24XX
 237         if (cpu_is_omap24xx() && gpio < 128)
 238                 return 0;
 239 #endif
 240         return -1;
 241 }
 242
 243 static int check_gpio(int gpio)
 244 {
 245         if (unlikely(gpio_valid(gpio)) < 0) {
 246                 printk(KERN_ERR "omap-gpio: invalid GPIO %d\n", gpio);
 247                 dump_stack();
 248                 return -1;
 249         }
 250         return 0;
 251 }
 252
 253 static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input)
 254 {
 255         void __iomem *reg = bank->base;
 256         u32 l;
 257
 258         switch (bank->method) {
 259         case METHOD_MPUIO:
 260                 reg += OMAP_MPUIO_IO_CNTL;
 261                 break;
 262         case METHOD_GPIO_1510:
 263                 reg += OMAP1510_GPIO_DIR_CONTROL;
 264                 break;
 265         case METHOD_GPIO_1610:
 266                 reg += OMAP1610_GPIO_DIRECTION;
 267                 break;
 268         case METHOD_GPIO_730:
 269                 reg += OMAP730_GPIO_DIR_CONTROL;
 270                 break;
 271         case METHOD_GPIO_24XX:
 272                 reg += OMAP24XX_GPIO_OE;
 273                 break;
 274         }
 275         l = __raw_readl(reg);
 276         if (is_input)
 277                 l |= 1 << gpio;
 278         else
 279                 l &= ~(1 << gpio);
 280         __raw_writel(l, reg);
 281 }
 282
 283 void omap_set_gpio_direction(int gpio, int is_input)
 284 {
 285         struct gpio_bank *bank;
 286
 287         if (check_gpio(gpio) < 0)
 288                 return;
 289         bank = get_gpio_bank(gpio);
 290         spin_lock(&bank->lock);
 291         _set_gpio_direction(bank, get_gpio_index(gpio), is_input);
 292         spin_unlock(&bank->lock);
 293 }
 294
 295 static void _set_gpio_dataout(struct gpio_bank *bank, int gpio, int enable)
 296 {
 297         void __iomem *reg = bank->base;
 298         u32 l = 0;
 299
 300         switch (bank->method) {
 301         case METHOD_MPUIO:
 302                 reg += OMAP_MPUIO_OUTPUT;
 303                 l = __raw_readl(reg);
 304                 if (enable)
 305                         l |= 1 << gpio;
 306                 else
 307                         l &= ~(1 << gpio);
 308                 break;
 309         case METHOD_GPIO_1510:
 310                 reg += OMAP1510_GPIO_DATA_OUTPUT;
 311                 l = __raw_readl(reg);
 312                 if (enable)
 313                         l |= 1 << gpio;
 314                 else
 315                         l &= ~(1 << gpio);
 316                 break;
 317         case METHOD_GPIO_1610:
 318                 if (enable)
 319                         reg += OMAP1610_GPIO_SET_DATAOUT;
 320                 else
 321                         reg += OMAP1610_GPIO_CLEAR_DATAOUT;
 322                 l = 1 << gpio;
 323                 break;
 324         case METHOD_GPIO_730:
 325                 reg += OMAP730_GPIO_DATA_OUTPUT;
 326                 l = __raw_readl(reg);
 327                 if (enable)
 328                         l |= 1 << gpio;
 329                 else
 330                         l &= ~(1 << gpio);
 331                 break;
 332         case METHOD_GPIO_24XX:
 333                 if (enable)
 334                         reg += OMAP24XX_GPIO_SETDATAOUT;
 335                 else
 336                         reg += OMAP24XX_GPIO_CLEARDATAOUT;
 337                 l = 1 << gpio;
 338                 break;
 339         default:
 340                 BUG();
 341                 return;
 342         }
 343         __raw_writel(l, reg);
 344 }
 345
 346 void omap_set_gpio_dataout(int gpio, int enable)
 347 {
 348         struct gpio_bank *bank;
 349
 350         if (check_gpio(gpio) < 0)
 351                 return;
 352         bank = get_gpio_bank(gpio);
 353         spin_lock(&bank->lock);
 354         _set_gpio_dataout(bank, get_gpio_index(gpio), enable);
 355         spin_unlock(&bank->lock);
 356 }
 357
 358 int omap_get_gpio_datain(int gpio)
 359 {
 360         struct gpio_bank *bank;
 361         void __iomem *reg;
 362
 363         if (check_gpio(gpio) < 0)
 364                 return -1;
 365         bank = get_gpio_bank(gpio);
 366         reg = bank->base;
 367         switch (bank->method) {
 368         case METHOD_MPUIO:
 369                 reg += OMAP_MPUIO_INPUT_LATCH;
 370                 break;
 371         case METHOD_GPIO_1510:
 372                 reg += OMAP1510_GPIO_DATA_INPUT;
 373                 break;
 374         case METHOD_GPIO_1610:
 375                 reg += OMAP1610_GPIO_DATAIN;
 376                 break;
 377         case METHOD_GPIO_730:
 378                 reg += OMAP730_GPIO_DATA_INPUT;
 379                 break;
 380         case METHOD_GPIO_24XX:
 381                 reg += OMAP24XX_GPIO_DATAIN;
 382                 break;
 383         default:
 384                 BUG();
 385                 return -1;
 386         }
 387         return (__raw_readl(reg)
 388                         & (1 << get_gpio_index(gpio))) != 0;
 389 }
 390
 391 #define MOD_REG_BIT(reg, bit_mask, set) \
 392 do {    \
 393         int l = __raw_readl(base + reg); \
 394         if (set) l |= bit_mask; \
 395         else l &= ~bit_mask; \
 396         __raw_writel(l, base + reg); \
 397 } while(0)
 398
 399 static inline void set_24xx_gpio_triggering(void __iomem *base, int gpio, int trigger)
 400 {
 401         u32 gpio_bit = 1 << gpio;
 402
 403         MOD_REG_BIT(OMAP24XX_GPIO_LEVELDETECT0, gpio_bit,
 404                 trigger & __IRQT_LOWLVL);
 405         MOD_REG_BIT(OMAP24XX_GPIO_LEVELDETECT1, gpio_bit,
 406                 trigger & __IRQT_HIGHLVL);
 407         MOD_REG_BIT(OMAP24XX_GPIO_RISINGDETECT, gpio_bit,
 408                 trigger & __IRQT_RISEDGE);
 409         MOD_REG_BIT(OMAP24XX_GPIO_FALLINGDETECT, gpio_bit,
 410                 trigger & __IRQT_FALEDGE);
 411         /* FIXME: Possibly do 'set_irq_handler(j, do_level_IRQ)' if only level
 412          * triggering requested. */
 413 }
 414
 415 static int _set_gpio_triggering(struct gpio_bank *bank, int gpio, int trigger)
 416 {
 417         void __iomem *reg = bank->base;
 418         u32 l = 0;
 419
 420         switch (bank->method) {
 421         case METHOD_MPUIO:
 422                 reg += OMAP_MPUIO_GPIO_INT_EDGE;
 423                 l = __raw_readl(reg);
 424                 if (trigger & __IRQT_RISEDGE)
 425                         l |= 1 << gpio;
 426                 else if (trigger & __IRQT_FALEDGE)
 427                         l &= ~(1 << gpio);
 428                 else
 429                         goto bad;
 430                 break;
 431         case METHOD_GPIO_1510:
 432                 reg += OMAP1510_GPIO_INT_CONTROL;
 433                 l = __raw_readl(reg);
 434                 if (trigger & __IRQT_RISEDGE)
 435                         l |= 1 << gpio;
 436                 else if (trigger & __IRQT_FALEDGE)
 437                         l &= ~(1 << gpio);
 438                 else
 439                         goto bad;
 440                 break;
 441         case METHOD_GPIO_1610:
 442                 if (gpio & 0x08)
 443                         reg += OMAP1610_GPIO_EDGE_CTRL2;
 444                 else
 445                         reg += OMAP1610_GPIO_EDGE_CTRL1;
 446                 gpio &= 0x07;
 447                 /* We allow only edge triggering, i.e. two lowest bits */
 448                 if (trigger & (__IRQT_LOWLVL | __IRQT_HIGHLVL))
 449                         BUG();
 450                 l = __raw_readl(reg);
 451                 l &= ~(3 << (gpio << 1));
 452                 if (trigger & __IRQT_RISEDGE)
 453                         l |= 2 << (gpio << 1);
 454                 if (trigger & __IRQT_FALEDGE)
 455                         l |= 1 << (gpio << 1);
 456                 break;
 457         case METHOD_GPIO_730:
 458                 reg += OMAP730_GPIO_INT_CONTROL;
 459                 l = __raw_readl(reg);
 460                 if (trigger & __IRQT_RISEDGE)
 461                         l |= 1 << gpio;
 462                 else if (trigger & __IRQT_FALEDGE)
 463                         l &= ~(1 << gpio);
 464                 else
 465                         goto bad;
 466                 break;
 467         case METHOD_GPIO_24XX:
 468                 set_24xx_gpio_triggering(reg, gpio, trigger);
 469                 break;
 470         default:
 471                 BUG();
 472                 goto bad;
 473         }
 474         __raw_writel(l, reg);
 475         return 0;
 476 bad:
 477         return -EINVAL;
 478 }
 479
 480 static int gpio_irq_type(unsigned irq, unsigned type)
 481 {
 482         struct gpio_bank *bank;
 483         unsigned gpio;
 484         int retval;
 485
 486         if (irq > IH_MPUIO_BASE)
 487                 gpio = OMAP_MPUIO(irq - IH_MPUIO_BASE);
 488         else
 489                 gpio = irq - IH_GPIO_BASE;
 490
 491         if (check_gpio(gpio) < 0)
 492                 return -EINVAL;
 493
 494         if (type & IRQT_PROBE)
 495                 return -EINVAL;
 496         if (!cpu_is_omap24xx() && (type & (__IRQT_LOWLVL|__IRQT_HIGHLVL)))
 497                 return -EINVAL;
 498
 499         bank = get_gpio_bank(gpio);
 500         spin_lock(&bank->lock);
 501         retval = _set_gpio_triggering(bank, get_gpio_index(gpio), type);
 502         spin_unlock(&bank->lock);
 503         return retval;
 504 }
 505
 506 static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
 507 {
 508         void __iomem *reg = bank->base;
 509
 510         switch (bank->method) {
 511         case METHOD_MPUIO:
 512                 /* MPUIO irqstatus is reset by reading the status register,
 513                  * so do nothing here */
 514                 return;
 515         case METHOD_GPIO_1510:
 516                 reg += OMAP1510_GPIO_INT_STATUS;
 517                 break;
 518         case METHOD_GPIO_1610:
 519                 reg += OMAP1610_GPIO_IRQSTATUS1;
 520                 break;
 521         case METHOD_GPIO_730:
 522                 reg += OMAP730_GPIO_INT_STATUS;
 523                 break;
 524         case METHOD_GPIO_24XX:
 525                 reg += OMAP24XX_GPIO_IRQSTATUS1;
 526                 break;
 527         default:
 528                 BUG();
 529                 return;
 530         }
 531         __raw_writel(gpio_mask, reg);
 532 }
 533
 534 static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
 535 {
 536         _clear_gpio_irqbank(bank, 1 << get_gpio_index(gpio));
 537 }
 538
 539 static u32 _get_gpio_irqbank_mask(struct gpio_bank *bank)
 540 {
 541         void __iomem *reg = bank->base;
 542         int inv = 0;
 543         u32 l;
 544         u32 mask;
 545
 546         switch (bank->method) {
 547         case METHOD_MPUIO:
 548                 reg += OMAP_MPUIO_GPIO_MASKIT;
 549                 mask = 0xffff;
 550                 inv = 1;
 551                 break;
 552         case METHOD_GPIO_1510:
 553                 reg += OMAP1510_GPIO_INT_MASK;
 554                 mask = 0xffff;
 555                 inv = 1;
 556                 break;
 557         case METHOD_GPIO_1610:
 558                 reg += OMAP1610_GPIO_IRQENABLE1;
 559                 mask = 0xffff;
 560                 break;
 561         case METHOD_GPIO_730:
 562                 reg += OMAP730_GPIO_INT_MASK;
 563                 mask = 0xffffffff;
 564                 inv = 1;
 565                 break;
 566         case METHOD_GPIO_24XX:
 567                 reg += OMAP24XX_GPIO_IRQENABLE1;
 568                 mask = 0xffffffff;
 569                 break;
 570         default:
 571                 BUG();
 572                 return 0;
 573         }
 574
 575         l = __raw_readl(reg);
 576         if (inv)
 577                 l = ~l;
 578         l &= mask;
 579         return l;
 580 }
 581
 582 static void _enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask, int enable)
 583 {
 584         void __iomem *reg = bank->base;
 585         u32 l;
 586
 587         switch (bank->method) {
 588         case METHOD_MPUIO:
 589                 reg += OMAP_MPUIO_GPIO_MASKIT;
 590                 l = __raw_readl(reg);
 591                 if (enable)
 592                         l &= ~(gpio_mask);
 593                 else
 594                         l |= gpio_mask;
 595                 break;
 596         case METHOD_GPIO_1510:
 597                 reg += OMAP1510_GPIO_INT_MASK;
 598                 l = __raw_readl(reg);
 599                 if (enable)
 600                         l &= ~(gpio_mask);
 601                 else
 602                         l |= gpio_mask;
 603                 break;
 604         case METHOD_GPIO_1610:
 605                 if (enable)
 606                         reg += OMAP1610_GPIO_SET_IRQENABLE1;
 607                 else
 608                         reg += OMAP1610_GPIO_CLEAR_IRQENABLE1;
 609                 l = gpio_mask;
 610                 break;
 611         case METHOD_GPIO_730:
 612                 reg += OMAP730_GPIO_INT_MASK;
 613                 l = __raw_readl(reg);
 614                 if (enable)
 615                         l &= ~(gpio_mask);
 616                 else
 617                         l |= gpio_mask;
 618                 break;
 619         case METHOD_GPIO_24XX:
 620                 if (enable)
 621                         reg += OMAP24XX_GPIO_SETIRQENABLE1;
 622                 else
 623                         reg += OMAP24XX_GPIO_CLEARIRQENABLE1;
 624                 l = gpio_mask;
 625                 break;
 626         default:
 627                 BUG();
 628                 return;
 629         }
 630         __raw_writel(l, reg);
 631 }
 632
 633 static inline void _set_gpio_irqenable(struct gpio_bank *bank, int gpio, int enable)
 634 {
 635         _enable_gpio_irqbank(bank, 1 << get_gpio_index(gpio), enable);
 636 }
 637
 638 /*
 639  * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
 640  * 1510 does not seem to have a wake-up register. If JTAG is connected
 641  * to the target, system will wake up always on GPIO events. While
 642  * system is running all registered GPIO interrupts need to have wake-up
 643  * enabled. When system is suspended, only selected GPIO interrupts need
 644  * to have wake-up enabled.
 645  */
 646 static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
 647 {
 648         switch (bank->method) {
 649         case METHOD_GPIO_1610:
 650         case METHOD_GPIO_24XX:
 651                 spin_lock(&bank->lock);
 652                 if (enable)
 653                         bank->suspend_wakeup |= (1 << gpio);
 654                 else
 655                         bank->suspend_wakeup &= ~(1 << gpio);
 656                 spin_unlock(&bank->lock);
 657                 return 0;
 658         default:
 659                 printk(KERN_ERR "Can't enable GPIO wakeup for method %i\n",
 660                        bank->method);
 661                 return -EINVAL;
 662         }
 663 }
 664
 665 /* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
 666 static int gpio_wake_enable(unsigned int irq, unsigned int enable)
 667 {
 668         unsigned int gpio = irq - IH_GPIO_BASE;
 669         struct gpio_bank *bank;
 670         int retval;
 671
 672         if (check_gpio(gpio) < 0)
 673                 return -ENODEV;
 674         bank = get_gpio_bank(gpio);
 675         spin_lock(&bank->lock);
 676         retval = _set_gpio_wakeup(bank, get_gpio_index(gpio), enable);
 677         spin_unlock(&bank->lock);
 678
 679         return retval;
 680 }
 681
 682 int omap_request_gpio(int gpio)
 683 {
 684         struct gpio_bank *bank;
 685
 686         if (check_gpio(gpio) < 0)
 687                 return -EINVAL;
 688
 689         bank = get_gpio_bank(gpio);
 690         spin_lock(&bank->lock);
 691         if (unlikely(bank->reserved_map & (1 << get_gpio_index(gpio)))) {
 692                 printk(KERN_ERR "omap-gpio: GPIO %d is already reserved!\n", gpio);
 693                 dump_stack();
 694                 spin_unlock(&bank->lock);
 695                 return -1;
 696         }
 697         bank->reserved_map |= (1 << get_gpio_index(gpio));
 698
 699         /* Set trigger to none. You need to enable the trigger after request_irq */
 700         _set_gpio_triggering(bank, get_gpio_index(gpio), IRQT_NOEDGE);
 701
 702 #ifdef CONFIG_ARCH_OMAP15XX
 703         if (bank->method == METHOD_GPIO_1510) {
 704                 void __iomem *reg;
 705
 706                 /* Claim the pin for MPU */
 707                 reg = bank->base + OMAP1510_GPIO_PIN_CONTROL;
 708                 __raw_writel(__raw_readl(reg) | (1 << get_gpio_index(gpio)), reg);
 709         }
 710 #endif
 711 #ifdef CONFIG_ARCH_OMAP16XX
 712         if (bank->method == METHOD_GPIO_1610) {
 713                 /* Enable wake-up during idle for dynamic tick */
 714                 void __iomem *reg = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
 715                 __raw_writel(1 << get_gpio_index(gpio), reg);
 716         }
 717 #endif
 718 #ifdef CONFIG_ARCH_OMAP24XX
 719         if (bank->method == METHOD_GPIO_24XX) {
 720                 /* Enable wake-up during idle for dynamic tick */
 721                 void __iomem *reg = bank->base + OMAP24XX_GPIO_SETWKUENA;
 722                 __raw_writel(1 << get_gpio_index(gpio), reg);
 723         }
 724 #endif
 725         spin_unlock(&bank->lock);
 726
 727         return 0;
 728 }
 729
 730 void omap_free_gpio(int gpio)
 731 {
 732         struct gpio_bank *bank;
 733
 734         if (check_gpio(gpio) < 0)
 735                 return;
 736         bank = get_gpio_bank(gpio);
 737         spin_lock(&bank->lock);
 738         if (unlikely(!(bank->reserved_map & (1 << get_gpio_index(gpio))))) {
 739                 printk(KERN_ERR "omap-gpio: GPIO %d wasn't reserved!\n", gpio);
 740                 dump_stack();
 741                 spin_unlock(&bank->lock);
 742                 return;
 743         }
 744 #ifdef CONFIG_ARCH_OMAP16XX
 745         if (bank->method == METHOD_GPIO_1610) {
 746                 /* Disable wake-up during idle for dynamic tick */
 747                 void __iomem *reg = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
 748                 __raw_writel(1 << get_gpio_index(gpio), reg);
 749         }
 750 #endif
 751 #ifdef CONFIG_ARCH_OMAP24XX
 752         if (bank->method == METHOD_GPIO_24XX) {
 753                 /* Disable wake-up during idle for dynamic tick */
 754                 void __iomem *reg = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
 755                 __raw_writel(1 << get_gpio_index(gpio), reg);
 756         }
 757 #endif
 758         bank->reserved_map &= ~(1 << get_gpio_index(gpio));
 759         _set_gpio_direction(bank, get_gpio_index(gpio), 1);
 760         _set_gpio_irqenable(bank, gpio, 0);
 761         _clear_gpio_irqstatus(bank, gpio);
 762         spin_unlock(&bank->lock);
 763 }
 764
 765 /*
 766  * We need to unmask the GPIO bank interrupt as soon as possible to
 767  * avoid missing GPIO interrupts for other lines in the bank.
 768  * Then we need to mask-read-clear-unmask the triggered GPIO lines
 769  * in the bank to avoid missing nested interrupts for a GPIO line.
 770  * If we wait to unmask individual GPIO lines in the bank after the
 771  * line's interrupt handler has been run, we may miss some nested
 772  * interrupts.
 773  */
 774 static void gpio_irq_handler(unsigned int irq, struct irqdesc *desc,
 775                              struct pt_regs *regs)
 776 {
 777         void __iomem *isr_reg = NULL;
 778         u32 isr;
 779         unsigned int gpio_irq;
 780         struct gpio_bank *bank;
 781         u32 retrigger = 0;
 782         int unmasked = 0;
 783
 784         desc->chip->ack(irq);
 785
 786         bank = get_irq_data(irq);
 787         if (bank->method == METHOD_MPUIO)
 788                 isr_reg = bank->base + OMAP_MPUIO_GPIO_INT;
 789 #ifdef CONFIG_ARCH_OMAP15XX
 790         if (bank->method == METHOD_GPIO_1510)
 791                 isr_reg = bank->base + OMAP1510_GPIO_INT_STATUS;
 792 #endif
 793 #if defined(CONFIG_ARCH_OMAP16XX)
 794         if (bank->method == METHOD_GPIO_1610)
 795                 isr_reg = bank->base + OMAP1610_GPIO_IRQSTATUS1;
 796 #endif
 797 #ifdef CONFIG_ARCH_OMAP730
 798         if (bank->method == METHOD_GPIO_730)
 799                 isr_reg = bank->base + OMAP730_GPIO_INT_STATUS;
 800 #endif
 801 #ifdef CONFIG_ARCH_OMAP24XX
 802         if (bank->method == METHOD_GPIO_24XX)
 803                 isr_reg = bank->base + OMAP24XX_GPIO_IRQSTATUS1;
 804 #endif
 805         while(1) {
 806                 u32 isr_saved, level_mask = 0;
 807                 u32 enabled;
 808
 809                 enabled = _get_gpio_irqbank_mask(bank);
 810                 isr_saved = isr = __raw_readl(isr_reg) & enabled;
 811
 812                 if (cpu_is_omap15xx() && (bank->method == METHOD_MPUIO))
 813                         isr &= 0x0000ffff;
 814
 815                 if (cpu_is_omap24xx()) {
 816                         level_mask =
 817                                 __raw_readl(bank->base +
 818                                         OMAP24XX_GPIO_LEVELDETECT0) |
 819                                 __raw_readl(bank->base +
 820                                         OMAP24XX_GPIO_LEVELDETECT1);
 821                         level_mask &= enabled;
 822                 }
 823
 824                 /* clear edge sensitive interrupts before handler(s) are
 825                 called so that we don't miss any interrupt occurred while
 826                 executing them */
 827                 _enable_gpio_irqbank(bank, isr_saved & ~level_mask, 0);
 828                 _clear_gpio_irqbank(bank, isr_saved & ~level_mask);
 829                 _enable_gpio_irqbank(bank, isr_saved & ~level_mask, 1);
 830
 831                 /* if there is only edge sensitive GPIO pin interrupts
 832                 configured, we could unmask GPIO bank interrupt immediately */
 833                 if (!level_mask && !unmasked) {
 834                         unmasked = 1;
 835                         desc->chip->unmask(irq);
 836                 }
 837
 838                 isr |= retrigger;
 839                 retrigger = 0;
 840                 if (!isr)
 841                         break;
 842
 843                 gpio_irq = bank->virtual_irq_start;
 844                 for (; isr != 0; isr >>= 1, gpio_irq++) {
 845                         struct irqdesc *d;
 846                         int irq_mask;
 847                         if (!(isr & 1))
 848                                 continue;
 849                         d = irq_desc + gpio_irq;
 850                         /* Don't run the handler if it's already running
 851                          * or was disabled lazely.
 852                          */
 853                         if (unlikely((d->depth ||
 854                                       (d->status & IRQ_INPROGRESS)))) {
 855                                 irq_mask = 1 <<
 856                                         (gpio_irq - bank->virtual_irq_start);
 857                                 /* The unmasking will be done by
 858                                  * enable_irq in case it is disabled or
 859                                  * after returning from the handler if
 860                                  * it's already running.
 861                                  */
 862                                 _enable_gpio_irqbank(bank, irq_mask, 0);
 863                                 if (!d->depth) {
 864                                         /* Level triggered interrupts
 865                                          * won't ever be reentered
 866                                          */
 867                                         BUG_ON(level_mask & irq_mask);
 868                                         d->status |= IRQ_PENDING;
 869                                 }
 870                                 continue;
 871                         }
 872
 873                         desc_handle_irq(gpio_irq, d, regs);
 874
 875                         if (unlikely((d->status & IRQ_PENDING) && !d->depth)) {
 876                                 irq_mask = 1 <<
 877                                         (gpio_irq - bank->virtual_irq_start);
 878                                 d->status &= ~IRQ_PENDING;
 879                                 _enable_gpio_irqbank(bank, irq_mask, 1);
 880                                 retrigger |= irq_mask;
 881                         }
 882                 }
 883
 884                 if (cpu_is_omap24xx()) {
 885                         /* clear level sensitive interrupts after handler(s) */
 886                         _enable_gpio_irqbank(bank, isr_saved & level_mask, 0);
 887                         _clear_gpio_irqbank(bank, isr_saved & level_mask);
 888                         _enable_gpio_irqbank(bank, isr_saved & level_mask, 1);
 889                 }
 890
 891         }
 892         /* if bank has any level sensitive GPIO pin interrupt
 893         configured, we must unmask the bank interrupt only after
 894         handler(s) are executed in order to avoid spurious bank
 895         interrupt */
 896         if (!unmasked)
 897                 desc->chip->unmask(irq);
 898
 899 }
 900
 901 static void gpio_ack_irq(unsigned int irq)
 902 {
 903         unsigned int gpio = irq - IH_GPIO_BASE;
 904         struct gpio_bank *bank = get_gpio_bank(gpio);
 905
 906         _clear_gpio_irqstatus(bank, gpio);
 907 }
 908
 909 static void gpio_mask_irq(unsigned int irq)
 910 {
 911         unsigned int gpio = irq - IH_GPIO_BASE;
 912         struct gpio_bank *bank = get_gpio_bank(gpio);
 913
 914         _set_gpio_irqenable(bank, gpio, 0);
 915 }
 916
 917 static void gpio_unmask_irq(unsigned int irq)
 918 {
 919         unsigned int gpio = irq - IH_GPIO_BASE;
 920         unsigned int gpio_idx = get_gpio_index(gpio);
 921         struct gpio_bank *bank = get_gpio_bank(gpio);
 922
 923         _set_gpio_irqenable(bank, gpio_idx, 1);
 924 }
 925
 926 static void mpuio_ack_irq(unsigned int irq)
 927 {
 928         /* The ISR is reset automatically, so do nothing here. */
 929 }
 930
 931 static void mpuio_mask_irq(unsigned int irq)
 932 {
 933         unsigned int gpio = OMAP_MPUIO(irq - IH_MPUIO_BASE);
 934         struct gpio_bank *bank = get_gpio_bank(gpio);
 935
 936         _set_gpio_irqenable(bank, gpio, 0);
 937 }
 938
 939 static void mpuio_unmask_irq(unsigned int irq)
 940 {
 941         unsigned int gpio = OMAP_MPUIO(irq - IH_MPUIO_BASE);
 942         struct gpio_bank *bank = get_gpio_bank(gpio);
 943
 944         _set_gpio_irqenable(bank, gpio, 1);
 945 }
 946
 947 static struct irq_chip gpio_irq_chip = {
 948         .name           = "GPIO",
 949         .ack            = gpio_ack_irq,
 950         .mask           = gpio_mask_irq,
 951         .unmask         = gpio_unmask_irq,
 952         .set_type       = gpio_irq_type,
 953         .set_wake       = gpio_wake_enable,
 954 };
 955
 956 static struct irq_chip mpuio_irq_chip = {
 957         .name   = "MPUIO",
 958         .ack    = mpuio_ack_irq,
 959         .mask   = mpuio_mask_irq,
 960         .unmask = mpuio_unmask_irq
 961 };
 962
 963 static int initialized;
 964 static struct clk * gpio_ick;
 965 static struct clk * gpio_fck;
 966
 967 static int __init _omap_gpio_init(void)
 968 {
 969         int i;
 970         struct gpio_bank *bank;
 971
 972         initialized = 1;
 973
 974         if (cpu_is_omap15xx()) {
 975                 gpio_ick = clk_get(NULL, "arm_gpio_ck");
 976                 if (IS_ERR(gpio_ick))
 977                         printk("Could not get arm_gpio_ck\n");
 978                 else
 979                         clk_enable(gpio_ick);
 980         }
 981         if (cpu_is_omap24xx()) {
 982                 gpio_ick = clk_get(NULL, "gpios_ick");
 983                 if (IS_ERR(gpio_ick))
 984                         printk("Could not get gpios_ick\n");
 985                 else
 986                         clk_enable(gpio_ick);
 987                 gpio_fck = clk_get(NULL, "gpios_fck");
 988                 if (IS_ERR(gpio_ick))
 989                         printk("Could not get gpios_fck\n");
 990                 else
 991                         clk_enable(gpio_fck);
 992         }
 993
 994 #ifdef CONFIG_ARCH_OMAP15XX
 995         if (cpu_is_omap15xx()) {
 996                 printk(KERN_INFO "OMAP1510 GPIO hardware\n");
 997                 gpio_bank_count = 2;
 998                 gpio_bank = gpio_bank_1510;
 999         }
1000 #endif
1001 #if defined(CONFIG_ARCH_OMAP16XX)
1002         if (cpu_is_omap16xx()) {
1003                 u32 rev;
1004
1005                 gpio_bank_count = 5;
1006                 gpio_bank = gpio_bank_1610;
1007                 rev = omap_readw(gpio_bank[1].base + OMAP1610_GPIO_REVISION);
1008                 printk(KERN_INFO "OMAP GPIO hardware version %d.%d\n",
1009                        (rev >> 4) & 0x0f, rev & 0x0f);
1010         }
1011 #endif
1012 #ifdef CONFIG_ARCH_OMAP730
1013         if (cpu_is_omap730()) {
1014                 printk(KERN_INFO "OMAP730 GPIO hardware\n");
1015                 gpio_bank_count = 7;
1016                 gpio_bank = gpio_bank_730;
1017         }
1018 #endif
1019 #ifdef CONFIG_ARCH_OMAP24XX
1020         if (cpu_is_omap24xx()) {
1021                 int rev;
1022
1023                 gpio_bank_count = 4;
1024                 gpio_bank = gpio_bank_24xx;
1025                 rev = omap_readl(gpio_bank[0].base + OMAP24XX_GPIO_REVISION);
1026                 printk(KERN_INFO "OMAP24xx GPIO hardware version %d.%d\n",
1027                         (rev >> 4) & 0x0f, rev & 0x0f);
1028         }
1029 #endif
1030         for (i = 0; i < gpio_bank_count; i++) {
1031                 int j, gpio_count = 16;
1032
1033                 bank = &gpio_bank[i];
1034                 bank->reserved_map = 0;
1035                 bank->base = IO_ADDRESS(bank->base);
1036                 spin_lock_init(&bank->lock);
1037                 if (bank->method == METHOD_MPUIO) {
1038                         omap_writew(0xFFFF, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_MASKIT);
1039                 }
1040 #ifdef CONFIG_ARCH_OMAP15XX
1041                 if (bank->method == METHOD_GPIO_1510) {
1042                         __raw_writew(0xffff, bank->base + OMAP1510_GPIO_INT_MASK);
1043                         __raw_writew(0x0000, bank->base + OMAP1510_GPIO_INT_STATUS);
1044                 }
1045 #endif
1046 #if defined(CONFIG_ARCH_OMAP16XX)
1047                 if (bank->method == METHOD_GPIO_1610) {
1048                         __raw_writew(0x0000, bank->base + OMAP1610_GPIO_IRQENABLE1);
1049                         __raw_writew(0xffff, bank->base + OMAP1610_GPIO_IRQSTATUS1);
1050                         __raw_writew(0x0014, bank->base + OMAP1610_GPIO_SYSCONFIG);
1051                 }
1052 #endif
1053 #ifdef CONFIG_ARCH_OMAP730
1054                 if (bank->method == METHOD_GPIO_730) {
1055                         __raw_writel(0xffffffff, bank->base + OMAP730_GPIO_INT_MASK);
1056                         __raw_writel(0x00000000, bank->base + OMAP730_GPIO_INT_STATUS);
1057
1058                         gpio_count = 32; /* 730 has 32-bit GPIOs */
1059                 }
1060 #endif
1061 #ifdef CONFIG_ARCH_OMAP24XX
1062                 if (bank->method == METHOD_GPIO_24XX) {
1063                         __raw_writel(0x00000000, bank->base + OMAP24XX_GPIO_IRQENABLE1);
1064                         __raw_writel(0xffffffff, bank->base + OMAP24XX_GPIO_IRQSTATUS1);
1065
1066                         gpio_count = 32;
1067                 }
1068 #endif
1069                 for (j = bank->virtual_irq_start;
1070                      j < bank->virtual_irq_start + gpio_count; j++) {
1071                         if (bank->method == METHOD_MPUIO)
1072                                 set_irq_chip(j, &mpuio_irq_chip);
1073                         else
1074                                 set_irq_chip(j, &gpio_irq_chip);
1075                         set_irq_handler(j, do_simple_IRQ);
1076                         set_irq_flags(j, IRQF_VALID);
1077                 }
1078                 set_irq_chained_handler(bank->irq, gpio_irq_handler);
1079                 set_irq_data(bank->irq, bank);
1080         }
1081
1082         /* Enable system clock for GPIO module.
1083          * The CAM_CLK_CTRL *is* really the right place. */
1084         if (cpu_is_omap16xx())
1085                 omap_writel(omap_readl(ULPD_CAM_CLK_CTRL) | 0x04, ULPD_CAM_CLK_CTRL);
1086
1087         return 0;
1088 }
1089
1090 #if defined (CONFIG_ARCH_OMAP16XX) || defined (CONFIG_ARCH_OMAP24XX)
1091 static int omap_gpio_suspend(struct sys_device *dev, pm_message_t mesg)
1092 {
1093         int i;
1094
1095         if (!cpu_is_omap24xx() && !cpu_is_omap16xx())
1096                 return 0;
1097
1098         for (i = 0; i < gpio_bank_count; i++) {
1099                 struct gpio_bank *bank = &gpio_bank[i];
1100                 void __iomem *wake_status;
1101                 void __iomem *wake_clear;
1102                 void __iomem *wake_set;
1103
1104                 switch (bank->method) {
1105                 case METHOD_GPIO_1610:
1106                         wake_status = bank->base + OMAP1610_GPIO_WAKEUPENABLE;
1107                         wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
1108                         wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
1109                         break;
1110                 case METHOD_GPIO_24XX:
1111                         wake_status = bank->base + OMAP24XX_GPIO_SETWKUENA;
1112                         wake_clear = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
1113                         wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA;
1114                         break;
1115                 default:
1116                         continue;
1117                 }
1118
1119                 spin_lock(&bank->lock);
1120                 bank->saved_wakeup = __raw_readl(wake_status);
1121                 __raw_writel(0xffffffff, wake_clear);
1122                 __raw_writel(bank->suspend_wakeup, wake_set);
1123                 spin_unlock(&bank->lock);
1124         }
1125
1126         return 0;
1127 }
1128
1129 static int omap_gpio_resume(struct sys_device *dev)
1130 {
1131         int i;
1132
1133         if (!cpu_is_omap24xx() && !cpu_is_omap16xx())
1134                 return 0;
1135
1136         for (i = 0; i < gpio_bank_count; i++) {
1137                 struct gpio_bank *bank = &gpio_bank[i];
1138                 void __iomem *wake_clear;
1139                 void __iomem *wake_set;
1140
1141                 switch (bank->method) {
1142                 case METHOD_GPIO_1610:
1143                         wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
1144                         wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
1145                         break;
1146                 case METHOD_GPIO_24XX:
1147                         wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
1148                         wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
1149                         break;
1150                 default:
1151                         continue;
1152                 }
1153
1154                 spin_lock(&bank->lock);
1155                 __raw_writel(0xffffffff, wake_clear);
1156                 __raw_writel(bank->saved_wakeup, wake_set);
1157                 spin_unlock(&bank->lock);
1158         }
1159
1160         return 0;
1161 }
1162
1163 static struct sysdev_class omap_gpio_sysclass = {
1164         set_kset_name("gpio"),
1165         .suspend        = omap_gpio_suspend,
1166         .resume         = omap_gpio_resume,
1167 };
1168
1169 static struct sys_device omap_gpio_device = {
1170         .id             = 0,
1171         .cls            = &omap_gpio_sysclass,
1172 };
1173 #endif
1174
1175 /*
1176  * This may get called early from board specific init
1177  * for boards that have interrupts routed via FPGA.
1178  */
1179 int omap_gpio_init(void)
1180 {
1181         if (!initialized)
1182                 return _omap_gpio_init();
1183         else
1184                 return 0;
1185 }
1186
1187 static int __init omap_gpio_sysinit(void)
1188 {
1189         int ret = 0;
1190
1191         if (!initialized)
1192                 ret = _omap_gpio_init();
1193
1194 #if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP24XX)
1195         if (cpu_is_omap16xx() || cpu_is_omap24xx()) {
1196                 if (ret == 0) {
1197                         ret = sysdev_class_register(&omap_gpio_sysclass);
1198                         if (ret == 0)
1199                                 ret = sysdev_register(&omap_gpio_device);
1200                 }
1201         }
1202 #endif
1203
1204         return ret;
1205 }
1206
1207 EXPORT_SYMBOL(omap_request_gpio);
1208 EXPORT_SYMBOL(omap_free_gpio);
1209 EXPORT_SYMBOL(omap_set_gpio_direction);
1210 EXPORT_SYMBOL(omap_set_gpio_dataout);
1211 EXPORT_SYMBOL(omap_get_gpio_datain);
1212
1213 arch_initcall(omap_gpio_sysinit);