arch/arm/mach-pxa/mfp-pxa2xx.c

   1 /*
   2  *  linux/arch/arm/mach-pxa/mfp-pxa2xx.c
   3  *
   4  *  PXA2xx pin mux configuration support
   5  *
   6  *  The GPIOs on PXA2xx can be configured as one of many alternate
   7  *  functions, this is by concept samilar to the MFP configuration
   8  *  on PXA3xx,  what's more important, the low power pin state and
   9  *  wakeup detection are also supported by the same framework.
  10  *
  11  *  This program is free software; you can redistribute it and/or modify
  12  *  it under the terms of the GNU General Public License version 2 as
  13  *  published by the Free Software Foundation.
  14  */
  15 #include <linux/gpio.h>
  16 #include <linux/gpio-pxa.h>
  17 #include <linux/module.h>
  18 #include <linux/kernel.h>
  19 #include <linux/init.h>
  20 #include <linux/io.h>
  21 #include <linux/syscore_ops.h>
  22
  23 #include <mach/pxa2xx-regs.h>
  24 #include <mach/mfp-pxa2xx.h>
  25
  26 #include "generic.h"
  27
  28 #define PGSR(x)         __REG2(0x40F00020, (x) << 2)
  29 #define __GAFR(u, x)    __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
  30 #define GAFR_L(x)       __GAFR(0, x)
  31 #define GAFR_U(x)       __GAFR(1, x)
  32
  33 #define BANK_OFF(n)     (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
  34 #define GPLR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5))
  35 #define GPDR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c)
  36 #define GPSR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x18)
  37 #define GPCR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x24)
  38
  39 #define PWER_WE35       (1 << 24)
  40
  41 struct gpio_desc {
  42         unsigned        valid           : 1;
  43         unsigned        can_wakeup      : 1;
  44         unsigned        keypad_gpio     : 1;
  45         unsigned        dir_inverted    : 1;
  46         unsigned int    mask; /* bit mask in PWER or PKWR */
  47         unsigned int    mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
  48         unsigned long   config;
  49 };
  50
  51 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
  52
  53 static unsigned long gpdr_lpm[4];
  54
  55 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
  56 {
  57         unsigned long gafr, mask = GPIO_bit(gpio);
  58         int bank = gpio_to_bank(gpio);
  59         int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
  60         int shft = (gpio & 0xf) << 1;
  61         int fn = MFP_AF(c);
  62         int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
  63
  64         if (fn > 3)
  65                 return -EINVAL;
  66
  67         /* alternate function and direction at run-time */
  68         gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
  69         gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
  70
  71         if (uorl == 0)
  72                 GAFR_L(bank) = gafr;
  73         else
  74                 GAFR_U(bank) = gafr;
  75
  76         if (is_out ^ gpio_desc[gpio].dir_inverted)
  77                 GPDR(gpio) |= mask;
  78         else
  79                 GPDR(gpio) &= ~mask;
  80
  81         /* alternate function and direction at low power mode */
  82         switch (c & MFP_LPM_STATE_MASK) {
  83         case MFP_LPM_DRIVE_HIGH:
  84                 PGSR(bank) |= mask;
  85                 is_out = 1;
  86                 break;
  87         case MFP_LPM_DRIVE_LOW:
  88                 PGSR(bank) &= ~mask;
  89                 is_out = 1;
  90                 break;
  91         case MFP_LPM_INPUT:
  92         case MFP_LPM_DEFAULT:
  93                 break;
  94         default:
  95                 /* warning and fall through, treat as MFP_LPM_DEFAULT */
  96                 pr_warning("%s: GPIO%d: unsupported low power mode\n",
  97                                 __func__, gpio);
  98                 break;
  99         }
 100
 101         if (is_out ^ gpio_desc[gpio].dir_inverted)
 102                 gpdr_lpm[bank] |= mask;
 103         else
 104                 gpdr_lpm[bank] &= ~mask;
 105
 106         /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
 107          * configurations of those pins not able to wakeup
 108          */
 109         if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
 110                 pr_warning("%s: GPIO%d unable to wakeup\n",
 111                                 __func__, gpio);
 112                 return -EINVAL;
 113         }
 114
 115         if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
 116                 pr_warning("%s: output GPIO%d unable to wakeup\n",
 117                                 __func__, gpio);
 118                 return -EINVAL;
 119         }
 120
 121         return 0;
 122 }
 123
 124 static inline int __mfp_validate(int mfp)
 125 {
 126         int gpio = mfp_to_gpio(mfp);
 127
 128         if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
 129                 pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
 130                 return -1;
 131         }
 132
 133         return gpio;
 134 }
 135
 136 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
 137 {
 138         unsigned long flags;
 139         unsigned long *c;
 140         int i, gpio;
 141
 142         for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
 143
 144                 gpio = __mfp_validate(MFP_PIN(*c));
 145                 if (gpio < 0)
 146                         continue;
 147
 148                 local_irq_save(flags);
 149
 150                 gpio_desc[gpio].config = *c;
 151                 __mfp_config_gpio(gpio, *c);
 152
 153                 local_irq_restore(flags);
 154         }
 155 }
 156
 157 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
 158 {
 159         unsigned long flags, c;
 160         int gpio;
 161
 162         gpio = __mfp_validate(mfp);
 163         if (gpio < 0)
 164                 return;
 165
 166         local_irq_save(flags);
 167
 168         c = gpio_desc[gpio].config;
 169         c = (c & ~MFP_LPM_STATE_MASK) | lpm;
 170         __mfp_config_gpio(gpio, c);
 171
 172         local_irq_restore(flags);
 173 }
 174
 175 int gpio_set_wake(unsigned int gpio, unsigned int on)
 176 {
 177         struct gpio_desc *d;
 178         unsigned long c, mux_taken;
 179
 180         if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
 181                 return -EINVAL;
 182
 183         d = &gpio_desc[gpio];
 184         c = d->config;
 185
 186         if (!d->valid)
 187                 return -EINVAL;
 188
 189         /* Allow keypad GPIOs to wakeup system when
 190          * configured as generic GPIOs.
 191          */
 192         if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
 193             (d->config & MFP_LPM_CAN_WAKEUP)) {
 194                 if (on)
 195                         PKWR |= d->mask;
 196                 else
 197                         PKWR &= ~d->mask;
 198                 return 0;
 199         }
 200
 201         mux_taken = (PWER & d->mux_mask) & (~d->mask);
 202         if (on && mux_taken)
 203                 return -EBUSY;
 204
 205         if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
 206                 if (on) {
 207                         PWER = (PWER & ~d->mux_mask) | d->mask;
 208
 209                         if (c & MFP_LPM_EDGE_RISE)
 210                                 PRER |= d->mask;
 211                         else
 212                                 PRER &= ~d->mask;
 213
 214                         if (c & MFP_LPM_EDGE_FALL)
 215                                 PFER |= d->mask;
 216                         else
 217                                 PFER &= ~d->mask;
 218                 } else {
 219                         PWER &= ~d->mask;
 220                         PRER &= ~d->mask;
 221                         PFER &= ~d->mask;
 222                 }
 223         }
 224         return 0;
 225 }
 226
 227 #ifdef CONFIG_PXA25x
 228 static void __init pxa25x_mfp_init(void)
 229 {
 230         int i;
 231
 232         /* running before pxa_gpio_probe() */
 233 #ifdef CONFIG_CPU_PXA26x
 234         pxa_last_gpio = 89;
 235 #else
 236         pxa_last_gpio = 84;
 237 #endif
 238         for (i = 0; i <= pxa_last_gpio; i++)
 239                 gpio_desc[i].valid = 1;
 240
 241         for (i = 0; i <= 15; i++) {
 242                 gpio_desc[i].can_wakeup = 1;
 243                 gpio_desc[i].mask = GPIO_bit(i);
 244         }
 245
 246         /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
 247          * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
 248          */
 249         for (i = 86; i <= pxa_last_gpio; i++)
 250                 gpio_desc[i].dir_inverted = 1;
 251 }
 252 #else
 253 static inline void pxa25x_mfp_init(void) {}
 254 #endif /* CONFIG_PXA25x */
 255
 256 #ifdef CONFIG_PXA27x
 257 static int pxa27x_pkwr_gpio[] = {
 258         13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
 259         95, 96, 97, 98, 99, 100, 101, 102
 260 };
 261
 262 int keypad_set_wake(unsigned int on)
 263 {
 264         unsigned int i, gpio, mask = 0;
 265         struct gpio_desc *d;
 266
 267         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 268
 269                 gpio = pxa27x_pkwr_gpio[i];
 270                 d = &gpio_desc[gpio];
 271
 272                 /* skip if configured as generic GPIO */
 273                 if (MFP_AF(d->config) == 0)
 274                         continue;
 275
 276                 if (d->config & MFP_LPM_CAN_WAKEUP)
 277                         mask |= gpio_desc[gpio].mask;
 278         }
 279
 280         if (on)
 281                 PKWR |= mask;
 282         else
 283                 PKWR &= ~mask;
 284         return 0;
 285 }
 286
 287 #define PWER_WEMUX2_GPIO38      (1 << 16)
 288 #define PWER_WEMUX2_GPIO53      (2 << 16)
 289 #define PWER_WEMUX2_GPIO40      (3 << 16)
 290 #define PWER_WEMUX2_GPIO36      (4 << 16)
 291 #define PWER_WEMUX2_MASK        (7 << 16)
 292 #define PWER_WEMUX3_GPIO31      (1 << 19)
 293 #define PWER_WEMUX3_GPIO113     (2 << 19)
 294 #define PWER_WEMUX3_MASK        (3 << 19)
 295
 296 #define INIT_GPIO_DESC_MUXED(mux, gpio)                         \
 297 do {                                                            \
 298         gpio_desc[(gpio)].can_wakeup = 1;                       \
 299         gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio;  \
 300         gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK;     \
 301 } while (0)
 302
 303 static void __init pxa27x_mfp_init(void)
 304 {
 305         int i, gpio;
 306
 307         pxa_last_gpio = 120;    /* running before pxa_gpio_probe() */
 308         for (i = 0; i <= pxa_last_gpio; i++) {
 309                 /* skip GPIO2, 5, 6, 7, 8, they are not
 310                  * valid pins allow configuration
 311                  */
 312                 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
 313                         continue;
 314
 315                 gpio_desc[i].valid = 1;
 316         }
 317
 318         /* Keypad GPIOs */
 319         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 320                 gpio = pxa27x_pkwr_gpio[i];
 321                 gpio_desc[gpio].can_wakeup = 1;
 322                 gpio_desc[gpio].keypad_gpio = 1;
 323                 gpio_desc[gpio].mask = 1 << i;
 324         }
 325
 326         /* Overwrite GPIO13 as a PWER wakeup source */
 327         for (i = 0; i <= 15; i++) {
 328                 /* skip GPIO2, 5, 6, 7, 8 */
 329                 if (GPIO_bit(i) & 0x1e4)
 330                         continue;
 331
 332                 gpio_desc[i].can_wakeup = 1;
 333                 gpio_desc[i].mask = GPIO_bit(i);
 334         }
 335
 336         gpio_desc[35].can_wakeup = 1;
 337         gpio_desc[35].mask = PWER_WE35;
 338
 339         INIT_GPIO_DESC_MUXED(WEMUX3, 31);
 340         INIT_GPIO_DESC_MUXED(WEMUX3, 113);
 341         INIT_GPIO_DESC_MUXED(WEMUX2, 38);
 342         INIT_GPIO_DESC_MUXED(WEMUX2, 53);
 343         INIT_GPIO_DESC_MUXED(WEMUX2, 40);
 344         INIT_GPIO_DESC_MUXED(WEMUX2, 36);
 345 }
 346 #else
 347 static inline void pxa27x_mfp_init(void) {}
 348 #endif /* CONFIG_PXA27x */
 349
 350 #ifdef CONFIG_PM
 351 static unsigned long saved_gafr[2][4];
 352 static unsigned long saved_gpdr[4];
 353 static unsigned long saved_gplr[4];
 354 static unsigned long saved_pgsr[4];
 355
 356 static int pxa2xx_mfp_suspend(void)
 357 {
 358         int i;
 359
 360         /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
 361         for (i = 0; i < pxa_last_gpio; i++) {
 362                 if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
 363                     (GPDR(i) & GPIO_bit(i))) {
 364                         if (GPLR(i) & GPIO_bit(i))
 365                                 PGSR(gpio_to_bank(i)) |= GPIO_bit(i);
 366                         else
 367                                 PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
 368                 }
 369         }
 370
 371         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
 372                 saved_gafr[0][i] = GAFR_L(i);
 373                 saved_gafr[1][i] = GAFR_U(i);
 374                 saved_gpdr[i] = GPDR(i * 32);
 375                 saved_gplr[i] = GPLR(i * 32);
 376                 saved_pgsr[i] = PGSR(i);
 377
 378                 GPSR(i * 32) = PGSR(i);
 379                 GPCR(i * 32) = ~PGSR(i);
 380         }
 381
 382         /* set GPDR bits taking into account MFP_LPM_KEEP_OUTPUT */
 383         for (i = 0; i < pxa_last_gpio; i++) {
 384                 if ((gpdr_lpm[gpio_to_bank(i)] & GPIO_bit(i)) ||
 385                     ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
 386                      (saved_gpdr[gpio_to_bank(i)] & GPIO_bit(i))))
 387                         GPDR(i) |= GPIO_bit(i);
 388                 else
 389                         GPDR(i) &= ~GPIO_bit(i);
 390         }
 391
 392         return 0;
 393 }
 394
 395 static void pxa2xx_mfp_resume(void)
 396 {
 397         int i;
 398
 399         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
 400                 GAFR_L(i) = saved_gafr[0][i];
 401                 GAFR_U(i) = saved_gafr[1][i];
 402                 GPSR(i * 32) = saved_gplr[i];
 403                 GPCR(i * 32) = ~saved_gplr[i];
 404                 GPDR(i * 32) = saved_gpdr[i];
 405                 PGSR(i) = saved_pgsr[i];
 406         }
 407         PSSR = PSSR_RDH | PSSR_PH;
 408 }
 409 #else
 410 #define pxa2xx_mfp_suspend      NULL
 411 #define pxa2xx_mfp_resume       NULL
 412 #endif
 413
 414 struct syscore_ops pxa2xx_mfp_syscore_ops = {
 415         .suspend        = pxa2xx_mfp_suspend,
 416         .resume         = pxa2xx_mfp_resume,
 417 };
 418
 419 static int __init pxa2xx_mfp_init(void)
 420 {
 421         int i;
 422
 423         if (!cpu_is_pxa2xx())
 424                 return 0;
 425
 426         if (cpu_is_pxa25x())
 427                 pxa25x_mfp_init();
 428
 429         if (cpu_is_pxa27x())
 430                 pxa27x_mfp_init();
 431
 432         /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
 433         PSSR = PSSR_RDH;
 434
 435         /* initialize gafr_run[], pgsr_lpm[] from existing values */
 436         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
 437                 gpdr_lpm[i] = GPDR(i * 32);
 438
 439         return 0;
 440 }
 441 postcore_initcall(pxa2xx_mfp_init);