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