drivers/gpio/gpio-lpc32xx.c

   1 /*
   2  * arch/arm/mach-lpc32xx/gpiolib.c
   3  *
   4  * Author: Kevin Wells <kevin.wells@nxp.com>
   5  *
   6  * Copyright (C) 2010 NXP Semiconductors
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/io.h>
  22 #include <linux/errno.h>
  23 #include <linux/gpio.h>
  24
  25 #include <mach/hardware.h>
  26 #include <mach/platform.h>
  27 #include <mach/gpio-lpc32xx.h>
  28
  29 #define LPC32XX_GPIO_P3_INP_STATE               _GPREG(0x000)
  30 #define LPC32XX_GPIO_P3_OUTP_SET                _GPREG(0x004)
  31 #define LPC32XX_GPIO_P3_OUTP_CLR                _GPREG(0x008)
  32 #define LPC32XX_GPIO_P3_OUTP_STATE              _GPREG(0x00C)
  33 #define LPC32XX_GPIO_P2_DIR_SET                 _GPREG(0x010)
  34 #define LPC32XX_GPIO_P2_DIR_CLR                 _GPREG(0x014)
  35 #define LPC32XX_GPIO_P2_DIR_STATE               _GPREG(0x018)
  36 #define LPC32XX_GPIO_P2_INP_STATE               _GPREG(0x01C)
  37 #define LPC32XX_GPIO_P2_OUTP_SET                _GPREG(0x020)
  38 #define LPC32XX_GPIO_P2_OUTP_CLR                _GPREG(0x024)
  39 #define LPC32XX_GPIO_P2_MUX_SET                 _GPREG(0x028)
  40 #define LPC32XX_GPIO_P2_MUX_CLR                 _GPREG(0x02C)
  41 #define LPC32XX_GPIO_P2_MUX_STATE               _GPREG(0x030)
  42 #define LPC32XX_GPIO_P0_INP_STATE               _GPREG(0x040)
  43 #define LPC32XX_GPIO_P0_OUTP_SET                _GPREG(0x044)
  44 #define LPC32XX_GPIO_P0_OUTP_CLR                _GPREG(0x048)
  45 #define LPC32XX_GPIO_P0_OUTP_STATE              _GPREG(0x04C)
  46 #define LPC32XX_GPIO_P0_DIR_SET                 _GPREG(0x050)
  47 #define LPC32XX_GPIO_P0_DIR_CLR                 _GPREG(0x054)
  48 #define LPC32XX_GPIO_P0_DIR_STATE               _GPREG(0x058)
  49 #define LPC32XX_GPIO_P1_INP_STATE               _GPREG(0x060)
  50 #define LPC32XX_GPIO_P1_OUTP_SET                _GPREG(0x064)
  51 #define LPC32XX_GPIO_P1_OUTP_CLR                _GPREG(0x068)
  52 #define LPC32XX_GPIO_P1_OUTP_STATE              _GPREG(0x06C)
  53 #define LPC32XX_GPIO_P1_DIR_SET                 _GPREG(0x070)
  54 #define LPC32XX_GPIO_P1_DIR_CLR                 _GPREG(0x074)
  55 #define LPC32XX_GPIO_P1_DIR_STATE               _GPREG(0x078)
  56
  57 #define GPIO012_PIN_TO_BIT(x)                   (1 << (x))
  58 #define GPIO3_PIN_TO_BIT(x)                     (1 << ((x) + 25))
  59 #define GPO3_PIN_TO_BIT(x)                      (1 << (x))
  60 #define GPIO012_PIN_IN_SEL(x, y)                (((x) >> (y)) & 1)
  61 #define GPIO3_PIN_IN_SHIFT(x)                   ((x) == 5 ? 24 : 10 + (x))
  62 #define GPIO3_PIN_IN_SEL(x, y)                  (((x) >> GPIO3_PIN_IN_SHIFT(y)) & 1)
  63 #define GPIO3_PIN5_IN_SEL(x)                    (((x) >> 24) & 1)
  64 #define GPI3_PIN_IN_SEL(x, y)                   (((x) >> (y)) & 1)
  65 #define GPO3_PIN_IN_SEL(x, y)                   (((x) >> (y)) & 1)
  66
  67 struct gpio_regs {
  68         void __iomem *inp_state;
  69         void __iomem *outp_state;
  70         void __iomem *outp_set;
  71         void __iomem *outp_clr;
  72         void __iomem *dir_set;
  73         void __iomem *dir_clr;
  74 };
  75
  76 /*
  77  * GPIO names
  78  */
  79 static const char *gpio_p0_names[LPC32XX_GPIO_P0_MAX] = {
  80         "p0.0", "p0.1", "p0.2", "p0.3",
  81         "p0.4", "p0.5", "p0.6", "p0.7"
  82 };
  83
  84 static const char *gpio_p1_names[LPC32XX_GPIO_P1_MAX] = {
  85         "p1.0", "p1.1", "p1.2", "p1.3",
  86         "p1.4", "p1.5", "p1.6", "p1.7",
  87         "p1.8", "p1.9", "p1.10", "p1.11",
  88         "p1.12", "p1.13", "p1.14", "p1.15",
  89         "p1.16", "p1.17", "p1.18", "p1.19",
  90         "p1.20", "p1.21", "p1.22", "p1.23",
  91 };
  92
  93 static const char *gpio_p2_names[LPC32XX_GPIO_P2_MAX] = {
  94         "p2.0", "p2.1", "p2.2", "p2.3",
  95         "p2.4", "p2.5", "p2.6", "p2.7",
  96         "p2.8", "p2.9", "p2.10", "p2.11",
  97         "p2.12"
  98 };
  99
 100 static const char *gpio_p3_names[LPC32XX_GPIO_P3_MAX] = {
 101         "gpio00", "gpio01", "gpio02", "gpio03",
 102         "gpio04", "gpio05"
 103 };
 104
 105 static const char *gpi_p3_names[LPC32XX_GPI_P3_MAX] = {
 106         "gpi00", "gpi01", "gpi02", "gpi03",
 107         "gpi04", "gpi05", "gpi06", "gpi07",
 108         "gpi08", "gpi09",  NULL,    NULL,
 109          NULL,    NULL,    NULL,   "gpi15",
 110         "gpi16", "gpi17", "gpi18", "gpi19",
 111         "gpi20", "gpi21", "gpi22", "gpi23",
 112         "gpi24", "gpi25", "gpi26", "gpi27"
 113 };
 114
 115 static const char *gpo_p3_names[LPC32XX_GPO_P3_MAX] = {
 116         "gpo00", "gpo01", "gpo02", "gpo03",
 117         "gpo04", "gpo05", "gpo06", "gpo07",
 118         "gpo08", "gpo09", "gpo10", "gpo11",
 119         "gpo12", "gpo13", "gpo14", "gpo15",
 120         "gpo16", "gpo17", "gpo18", "gpo19",
 121         "gpo20", "gpo21", "gpo22", "gpo23"
 122 };
 123
 124 static struct gpio_regs gpio_grp_regs_p0 = {
 125         .inp_state      = LPC32XX_GPIO_P0_INP_STATE,
 126         .outp_set       = LPC32XX_GPIO_P0_OUTP_SET,
 127         .outp_clr       = LPC32XX_GPIO_P0_OUTP_CLR,
 128         .dir_set        = LPC32XX_GPIO_P0_DIR_SET,
 129         .dir_clr        = LPC32XX_GPIO_P0_DIR_CLR,
 130 };
 131
 132 static struct gpio_regs gpio_grp_regs_p1 = {
 133         .inp_state      = LPC32XX_GPIO_P1_INP_STATE,
 134         .outp_set       = LPC32XX_GPIO_P1_OUTP_SET,
 135         .outp_clr       = LPC32XX_GPIO_P1_OUTP_CLR,
 136         .dir_set        = LPC32XX_GPIO_P1_DIR_SET,
 137         .dir_clr        = LPC32XX_GPIO_P1_DIR_CLR,
 138 };
 139
 140 static struct gpio_regs gpio_grp_regs_p2 = {
 141         .inp_state      = LPC32XX_GPIO_P2_INP_STATE,
 142         .outp_set       = LPC32XX_GPIO_P2_OUTP_SET,
 143         .outp_clr       = LPC32XX_GPIO_P2_OUTP_CLR,
 144         .dir_set        = LPC32XX_GPIO_P2_DIR_SET,
 145         .dir_clr        = LPC32XX_GPIO_P2_DIR_CLR,
 146 };
 147
 148 static struct gpio_regs gpio_grp_regs_p3 = {
 149         .inp_state      = LPC32XX_GPIO_P3_INP_STATE,
 150         .outp_state     = LPC32XX_GPIO_P3_OUTP_STATE,
 151         .outp_set       = LPC32XX_GPIO_P3_OUTP_SET,
 152         .outp_clr       = LPC32XX_GPIO_P3_OUTP_CLR,
 153         .dir_set        = LPC32XX_GPIO_P2_DIR_SET,
 154         .dir_clr        = LPC32XX_GPIO_P2_DIR_CLR,
 155 };
 156
 157 struct lpc32xx_gpio_chip {
 158         struct gpio_chip        chip;
 159         struct gpio_regs        *gpio_grp;
 160 };
 161
 162 static inline struct lpc32xx_gpio_chip *to_lpc32xx_gpio(
 163         struct gpio_chip *gpc)
 164 {
 165         return container_of(gpc, struct lpc32xx_gpio_chip, chip);
 166 }
 167
 168 static void __set_gpio_dir_p012(struct lpc32xx_gpio_chip *group,
 169         unsigned pin, int input)
 170 {
 171         if (input)
 172                 __raw_writel(GPIO012_PIN_TO_BIT(pin),
 173                         group->gpio_grp->dir_clr);
 174         else
 175                 __raw_writel(GPIO012_PIN_TO_BIT(pin),
 176                         group->gpio_grp->dir_set);
 177 }
 178
 179 static void __set_gpio_dir_p3(struct lpc32xx_gpio_chip *group,
 180         unsigned pin, int input)
 181 {
 182         u32 u = GPIO3_PIN_TO_BIT(pin);
 183
 184         if (input)
 185                 __raw_writel(u, group->gpio_grp->dir_clr);
 186         else
 187                 __raw_writel(u, group->gpio_grp->dir_set);
 188 }
 189
 190 static void __set_gpio_level_p012(struct lpc32xx_gpio_chip *group,
 191         unsigned pin, int high)
 192 {
 193         if (high)
 194                 __raw_writel(GPIO012_PIN_TO_BIT(pin),
 195                         group->gpio_grp->outp_set);
 196         else
 197                 __raw_writel(GPIO012_PIN_TO_BIT(pin),
 198                         group->gpio_grp->outp_clr);
 199 }
 200
 201 static void __set_gpio_level_p3(struct lpc32xx_gpio_chip *group,
 202         unsigned pin, int high)
 203 {
 204         u32 u = GPIO3_PIN_TO_BIT(pin);
 205
 206         if (high)
 207                 __raw_writel(u, group->gpio_grp->outp_set);
 208         else
 209                 __raw_writel(u, group->gpio_grp->outp_clr);
 210 }
 211
 212 static void __set_gpo_level_p3(struct lpc32xx_gpio_chip *group,
 213         unsigned pin, int high)
 214 {
 215         if (high)
 216                 __raw_writel(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_set);
 217         else
 218                 __raw_writel(GPO3_PIN_TO_BIT(pin), group->gpio_grp->outp_clr);
 219 }
 220
 221 static int __get_gpio_state_p012(struct lpc32xx_gpio_chip *group,
 222         unsigned pin)
 223 {
 224         return GPIO012_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state),
 225                 pin);
 226 }
 227
 228 static int __get_gpio_state_p3(struct lpc32xx_gpio_chip *group,
 229         unsigned pin)
 230 {
 231         int state = __raw_readl(group->gpio_grp->inp_state);
 232
 233         /*
 234          * P3 GPIO pin input mapping is not contiguous, GPIOP3-0..4 is mapped
 235          * to bits 10..14, while GPIOP3-5 is mapped to bit 24.
 236          */
 237         return GPIO3_PIN_IN_SEL(state, pin);
 238 }
 239
 240 static int __get_gpi_state_p3(struct lpc32xx_gpio_chip *group,
 241         unsigned pin)
 242 {
 243         return GPI3_PIN_IN_SEL(__raw_readl(group->gpio_grp->inp_state), pin);
 244 }
 245
 246 static int __get_gpo_state_p3(struct lpc32xx_gpio_chip *group,
 247         unsigned pin)
 248 {
 249         return GPO3_PIN_IN_SEL(__raw_readl(group->gpio_grp->outp_state), pin);
 250 }
 251
 252 /*
 253  * GENERIC_GPIO primitives.
 254  */
 255 static int lpc32xx_gpio_dir_input_p012(struct gpio_chip *chip,
 256         unsigned pin)
 257 {
 258         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 259
 260         __set_gpio_dir_p012(group, pin, 1);
 261
 262         return 0;
 263 }
 264
 265 static int lpc32xx_gpio_dir_input_p3(struct gpio_chip *chip,
 266         unsigned pin)
 267 {
 268         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 269
 270         __set_gpio_dir_p3(group, pin, 1);
 271
 272         return 0;
 273 }
 274
 275 static int lpc32xx_gpio_dir_in_always(struct gpio_chip *chip,
 276         unsigned pin)
 277 {
 278         return 0;
 279 }
 280
 281 static int lpc32xx_gpio_get_value_p012(struct gpio_chip *chip, unsigned pin)
 282 {
 283         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 284
 285         return __get_gpio_state_p012(group, pin);
 286 }
 287
 288 static int lpc32xx_gpio_get_value_p3(struct gpio_chip *chip, unsigned pin)
 289 {
 290         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 291
 292         return __get_gpio_state_p3(group, pin);
 293 }
 294
 295 static int lpc32xx_gpi_get_value(struct gpio_chip *chip, unsigned pin)
 296 {
 297         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 298
 299         return __get_gpi_state_p3(group, pin);
 300 }
 301
 302 static int lpc32xx_gpio_dir_output_p012(struct gpio_chip *chip, unsigned pin,
 303         int value)
 304 {
 305         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 306
 307         __set_gpio_dir_p012(group, pin, 0);
 308
 309         return 0;
 310 }
 311
 312 static int lpc32xx_gpio_dir_output_p3(struct gpio_chip *chip, unsigned pin,
 313         int value)
 314 {
 315         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 316
 317         __set_gpio_dir_p3(group, pin, 0);
 318
 319         return 0;
 320 }
 321
 322 static int lpc32xx_gpio_dir_out_always(struct gpio_chip *chip, unsigned pin,
 323         int value)
 324 {
 325         return 0;
 326 }
 327
 328 static void lpc32xx_gpio_set_value_p012(struct gpio_chip *chip, unsigned pin,
 329         int value)
 330 {
 331         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 332
 333         __set_gpio_level_p012(group, pin, value);
 334 }
 335
 336 static void lpc32xx_gpio_set_value_p3(struct gpio_chip *chip, unsigned pin,
 337         int value)
 338 {
 339         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 340
 341         __set_gpio_level_p3(group, pin, value);
 342 }
 343
 344 static void lpc32xx_gpo_set_value(struct gpio_chip *chip, unsigned pin,
 345         int value)
 346 {
 347         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 348
 349         __set_gpo_level_p3(group, pin, value);
 350 }
 351
 352 static int lpc32xx_gpo_get_value(struct gpio_chip *chip, unsigned pin)
 353 {
 354         struct lpc32xx_gpio_chip *group = to_lpc32xx_gpio(chip);
 355
 356         return __get_gpo_state_p3(group, pin);
 357 }
 358
 359 static int lpc32xx_gpio_request(struct gpio_chip *chip, unsigned pin)
 360 {
 361         if (pin < chip->ngpio)
 362                 return 0;
 363
 364         return -EINVAL;
 365 }
 366
 367 static struct lpc32xx_gpio_chip lpc32xx_gpiochip[] = {
 368         {
 369                 .chip = {
 370                         .label                  = "gpio_p0",
 371                         .direction_input        = lpc32xx_gpio_dir_input_p012,
 372                         .get                    = lpc32xx_gpio_get_value_p012,
 373                         .direction_output       = lpc32xx_gpio_dir_output_p012,
 374                         .set                    = lpc32xx_gpio_set_value_p012,
 375                         .request                = lpc32xx_gpio_request,
 376                         .base                   = LPC32XX_GPIO_P0_GRP,
 377                         .ngpio                  = LPC32XX_GPIO_P0_MAX,
 378                         .names                  = gpio_p0_names,
 379                         .can_sleep              = 0,
 380                 },
 381                 .gpio_grp = &gpio_grp_regs_p0,
 382         },
 383         {
 384                 .chip = {
 385                         .label                  = "gpio_p1",
 386                         .direction_input        = lpc32xx_gpio_dir_input_p012,
 387                         .get                    = lpc32xx_gpio_get_value_p012,
 388                         .direction_output       = lpc32xx_gpio_dir_output_p012,
 389                         .set                    = lpc32xx_gpio_set_value_p012,
 390                         .request                = lpc32xx_gpio_request,
 391                         .base                   = LPC32XX_GPIO_P1_GRP,
 392                         .ngpio                  = LPC32XX_GPIO_P1_MAX,
 393                         .names                  = gpio_p1_names,
 394                         .can_sleep              = 0,
 395                 },
 396                 .gpio_grp = &gpio_grp_regs_p1,
 397         },
 398         {
 399                 .chip = {
 400                         .label                  = "gpio_p2",
 401                         .direction_input        = lpc32xx_gpio_dir_input_p012,
 402                         .get                    = lpc32xx_gpio_get_value_p012,
 403                         .direction_output       = lpc32xx_gpio_dir_output_p012,
 404                         .set                    = lpc32xx_gpio_set_value_p012,
 405                         .request                = lpc32xx_gpio_request,
 406                         .base                   = LPC32XX_GPIO_P2_GRP,
 407                         .ngpio                  = LPC32XX_GPIO_P2_MAX,
 408                         .names                  = gpio_p2_names,
 409                         .can_sleep              = 0,
 410                 },
 411                 .gpio_grp = &gpio_grp_regs_p2,
 412         },
 413         {
 414                 .chip = {
 415                         .label                  = "gpio_p3",
 416                         .direction_input        = lpc32xx_gpio_dir_input_p3,
 417                         .get                    = lpc32xx_gpio_get_value_p3,
 418                         .direction_output       = lpc32xx_gpio_dir_output_p3,
 419                         .set                    = lpc32xx_gpio_set_value_p3,
 420                         .request                = lpc32xx_gpio_request,
 421                         .base                   = LPC32XX_GPIO_P3_GRP,
 422                         .ngpio                  = LPC32XX_GPIO_P3_MAX,
 423                         .names                  = gpio_p3_names,
 424                         .can_sleep              = 0,
 425                 },
 426                 .gpio_grp = &gpio_grp_regs_p3,
 427         },
 428         {
 429                 .chip = {
 430                         .label                  = "gpi_p3",
 431                         .direction_input        = lpc32xx_gpio_dir_in_always,
 432                         .get                    = lpc32xx_gpi_get_value,
 433                         .request                = lpc32xx_gpio_request,
 434                         .base                   = LPC32XX_GPI_P3_GRP,
 435                         .ngpio                  = LPC32XX_GPI_P3_MAX,
 436                         .names                  = gpi_p3_names,
 437                         .can_sleep              = 0,
 438                 },
 439                 .gpio_grp = &gpio_grp_regs_p3,
 440         },
 441         {
 442                 .chip = {
 443                         .label                  = "gpo_p3",
 444                         .direction_output       = lpc32xx_gpio_dir_out_always,
 445                         .set                    = lpc32xx_gpo_set_value,
 446                         .get                    = lpc32xx_gpo_get_value,
 447                         .request                = lpc32xx_gpio_request,
 448                         .base                   = LPC32XX_GPO_P3_GRP,
 449                         .ngpio                  = LPC32XX_GPO_P3_MAX,
 450                         .names                  = gpo_p3_names,
 451                         .can_sleep              = 0,
 452                 },
 453                 .gpio_grp = &gpio_grp_regs_p3,
 454         },
 455 };
 456
 457 void __init lpc32xx_gpio_init(void)
 458 {
 459         int i;
 460
 461         for (i = 0; i < ARRAY_SIZE(lpc32xx_gpiochip); i++)
 462                 gpiochip_add(&lpc32xx_gpiochip[i].chip);
 463 }