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