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
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/sysdev.h>
  20
  21 #include <mach/hardware.h>
  22 #include <mach/pxa-regs.h>
  23 #include <mach/pxa2xx-regs.h>
  24 #include <mach/mfp-pxa2xx.h>
  25
  26 #include "generic.h"
  27
  28 #define gpio_to_bank(gpio)      ((gpio) >> 5)
  29
  30 #define PGSR(x)         __REG2(0x40F00020, (x) << 2)
  31 #define __GAFR(u, x)    __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
  32 #define GAFR_L(x)       __GAFR(0, x)
  33 #define GAFR_U(x)       __GAFR(1, x)
  34
  35 #define PWER_WE35       (1 << 24)
  36
  37 struct gpio_desc {
  38         unsigned        valid           : 1;
  39         unsigned        can_wakeup      : 1;
  40         unsigned        keypad_gpio     : 1;
  41         unsigned        dir_inverted    : 1;
  42         unsigned int    mask; /* bit mask in PWER or PKWR */
  43         unsigned int    mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
  44         unsigned long   config;
  45 };
  46
  47 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
  48
  49 static unsigned long gpdr_lpm[4];
  50
  51 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
  52 {
  53         unsigned long gafr, mask = GPIO_bit(gpio);
  54         int bank = gpio_to_bank(gpio);
  55         int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
  56         int shft = (gpio & 0xf) << 1;
  57         int fn = MFP_AF(c);
  58         int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
  59
  60         if (fn > 3)
  61                 return -EINVAL;
  62
  63         /* alternate function and direction at run-time */
  64         gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
  65         gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
  66
  67         if (uorl == 0)
  68                 GAFR_L(bank) = gafr;
  69         else
  70                 GAFR_U(bank) = gafr;
  71
  72         if (is_out ^ gpio_desc[gpio].dir_inverted)
  73                 GPDR(gpio) |= mask;
  74         else
  75                 GPDR(gpio) &= ~mask;
  76
  77         /* alternate function and direction at low power mode */
  78         switch (c & MFP_LPM_STATE_MASK) {
  79         case MFP_LPM_DRIVE_HIGH:
  80                 PGSR(bank) |= mask;
  81                 is_out = 1;
  82                 break;
  83         case MFP_LPM_DRIVE_LOW:
  84                 PGSR(bank) &= ~mask;
  85                 is_out = 1;
  86                 break;
  87         case MFP_LPM_DEFAULT:
  88                 break;
  89         default:
  90                 /* warning and fall through, treat as MFP_LPM_DEFAULT */
  91                 pr_warning("%s: GPIO%d: unsupported low power mode\n",
  92                                 __func__, gpio);
  93                 break;
  94         }
  95
  96         if (is_out ^ gpio_desc[gpio].dir_inverted)
  97                 gpdr_lpm[bank] |= mask;
  98         else
  99                 gpdr_lpm[bank] &= ~mask;
 100
 101         /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
 102          * configurations of those pins not able to wakeup
 103          */
 104         if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
 105                 pr_warning("%s: GPIO%d unable to wakeup\n",
 106                                 __func__, gpio);
 107                 return -EINVAL;
 108         }
 109
 110         if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
 111                 pr_warning("%s: output GPIO%d unable to wakeup\n",
 112                                 __func__, gpio);
 113                 return -EINVAL;
 114         }
 115
 116         return 0;
 117 }
 118
 119 static inline int __mfp_validate(int mfp)
 120 {
 121         int gpio = mfp_to_gpio(mfp);
 122
 123         if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
 124                 pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
 125                 return -1;
 126         }
 127
 128         return gpio;
 129 }
 130
 131 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
 132 {
 133         unsigned long flags;
 134         unsigned long *c;
 135         int i, gpio;
 136
 137         for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
 138
 139                 gpio = __mfp_validate(MFP_PIN(*c));
 140                 if (gpio < 0)
 141                         continue;
 142
 143                 local_irq_save(flags);
 144
 145                 gpio_desc[gpio].config = *c;
 146                 __mfp_config_gpio(gpio, *c);
 147
 148                 local_irq_restore(flags);
 149         }
 150 }
 151
 152 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
 153 {
 154         unsigned long flags, c;
 155         int gpio;
 156
 157         gpio = __mfp_validate(mfp);
 158         if (gpio < 0)
 159                 return;
 160
 161         local_irq_save(flags);
 162
 163         c = gpio_desc[gpio].config;
 164         c = (c & ~MFP_LPM_STATE_MASK) | lpm;
 165         __mfp_config_gpio(gpio, c);
 166
 167         local_irq_restore(flags);
 168 }
 169
 170 int gpio_set_wake(unsigned int gpio, unsigned int on)
 171 {
 172         struct gpio_desc *d;
 173         unsigned long c, mux_taken;
 174
 175         if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
 176                 return -EINVAL;
 177
 178         d = &gpio_desc[gpio];
 179         c = d->config;
 180
 181         if (!d->valid)
 182                 return -EINVAL;
 183
 184         if (d->keypad_gpio)
 185                 return -EINVAL;
 186
 187         mux_taken = (PWER & d->mux_mask) & (~d->mask);
 188         if (on && mux_taken)
 189                 return -EBUSY;
 190
 191         if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
 192                 if (on) {
 193                         PWER = (PWER & ~d->mux_mask) | d->mask;
 194
 195                         if (c & MFP_LPM_EDGE_RISE)
 196                                 PRER |= d->mask;
 197                         else
 198                                 PRER &= ~d->mask;
 199
 200                         if (c & MFP_LPM_EDGE_FALL)
 201                                 PFER |= d->mask;
 202                         else
 203                                 PFER &= ~d->mask;
 204                 } else {
 205                         PWER &= ~d->mask;
 206                         PRER &= ~d->mask;
 207                         PFER &= ~d->mask;
 208                 }
 209         }
 210         return 0;
 211 }
 212
 213 #ifdef CONFIG_PXA25x
 214 static void __init pxa25x_mfp_init(void)
 215 {
 216         int i;
 217
 218         for (i = 0; i <= pxa_last_gpio; i++)
 219                 gpio_desc[i].valid = 1;
 220
 221         for (i = 0; i <= 15; i++) {
 222                 gpio_desc[i].can_wakeup = 1;
 223                 gpio_desc[i].mask = GPIO_bit(i);
 224         }
 225
 226         /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
 227          * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
 228          */
 229         for (i = 86; i <= pxa_last_gpio; i++)
 230                 gpio_desc[i].dir_inverted = 1;
 231 }
 232 #else
 233 static inline void pxa25x_mfp_init(void) {}
 234 #endif /* CONFIG_PXA25x */
 235
 236 #ifdef CONFIG_PXA27x
 237 static int pxa27x_pkwr_gpio[] = {
 238         13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
 239         95, 96, 97, 98, 99, 100, 101, 102
 240 };
 241
 242 int keypad_set_wake(unsigned int on)
 243 {
 244         unsigned int i, gpio, mask = 0;
 245
 246         if (!on) {
 247                 PKWR = 0;
 248                 return 0;
 249         }
 250
 251         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 252
 253                 gpio = pxa27x_pkwr_gpio[i];
 254
 255                 if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP)
 256                         mask |= gpio_desc[gpio].mask;
 257         }
 258
 259         PKWR = mask;
 260         return 0;
 261 }
 262
 263 #define PWER_WEMUX2_GPIO38      (1 << 16)
 264 #define PWER_WEMUX2_GPIO53      (2 << 16)
 265 #define PWER_WEMUX2_GPIO40      (3 << 16)
 266 #define PWER_WEMUX2_GPIO36      (4 << 16)
 267 #define PWER_WEMUX2_MASK        (7 << 16)
 268 #define PWER_WEMUX3_GPIO31      (1 << 19)
 269 #define PWER_WEMUX3_GPIO113     (2 << 19)
 270 #define PWER_WEMUX3_MASK        (3 << 19)
 271
 272 #define INIT_GPIO_DESC_MUXED(mux, gpio)                         \
 273 do {                                                            \
 274         gpio_desc[(gpio)].can_wakeup = 1;                       \
 275         gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio;  \
 276         gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK;     \
 277 } while (0)
 278
 279 static void __init pxa27x_mfp_init(void)
 280 {
 281         int i, gpio;
 282
 283         for (i = 0; i <= pxa_last_gpio; i++) {
 284                 /* skip GPIO2, 5, 6, 7, 8, they are not
 285                  * valid pins allow configuration
 286                  */
 287                 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
 288                         continue;
 289
 290                 gpio_desc[i].valid = 1;
 291         }
 292
 293         /* Keypad GPIOs */
 294         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 295                 gpio = pxa27x_pkwr_gpio[i];
 296                 gpio_desc[gpio].can_wakeup = 1;
 297                 gpio_desc[gpio].keypad_gpio = 1;
 298                 gpio_desc[gpio].mask = 1 << i;
 299         }
 300
 301         /* Overwrite GPIO13 as a PWER wakeup source */
 302         for (i = 0; i <= 15; i++) {
 303                 /* skip GPIO2, 5, 6, 7, 8 */
 304                 if (GPIO_bit(i) & 0x1e4)
 305                         continue;
 306
 307                 gpio_desc[i].can_wakeup = 1;
 308                 gpio_desc[i].mask = GPIO_bit(i);
 309         }
 310
 311         gpio_desc[35].can_wakeup = 1;
 312         gpio_desc[35].mask = PWER_WE35;
 313
 314         INIT_GPIO_DESC_MUXED(WEMUX3, 31);
 315         INIT_GPIO_DESC_MUXED(WEMUX3, 113);
 316         INIT_GPIO_DESC_MUXED(WEMUX2, 38);
 317         INIT_GPIO_DESC_MUXED(WEMUX2, 53);
 318         INIT_GPIO_DESC_MUXED(WEMUX2, 40);
 319         INIT_GPIO_DESC_MUXED(WEMUX2, 36);
 320 }
 321 #else
 322 static inline void pxa27x_mfp_init(void) {}
 323 #endif /* CONFIG_PXA27x */
 324
 325 #ifdef CONFIG_PM
 326 static unsigned long saved_gafr[2][4];
 327 static unsigned long saved_gpdr[4];
 328
 329 static int pxa2xx_mfp_suspend(struct sys_device *d, pm_message_t state)
 330 {
 331         int i;
 332
 333         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
 334
 335                 saved_gafr[0][i] = GAFR_L(i);
 336                 saved_gafr[1][i] = GAFR_U(i);
 337                 saved_gpdr[i] = GPDR(i * 32);
 338
 339                 GPDR(i * 32) = gpdr_lpm[i];
 340         }
 341         return 0;
 342 }
 343
 344 static int pxa2xx_mfp_resume(struct sys_device *d)
 345 {
 346         int i;
 347
 348         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
 349                 GAFR_L(i) = saved_gafr[0][i];
 350                 GAFR_U(i) = saved_gafr[1][i];
 351                 GPDR(i * 32) = saved_gpdr[i];
 352         }
 353         PSSR = PSSR_RDH | PSSR_PH;
 354         return 0;
 355 }
 356 #else
 357 #define pxa2xx_mfp_suspend      NULL
 358 #define pxa2xx_mfp_resume       NULL
 359 #endif
 360
 361 struct sysdev_class pxa2xx_mfp_sysclass = {
 362         .name           = "mfp",
 363         .suspend        = pxa2xx_mfp_suspend,
 364         .resume         = pxa2xx_mfp_resume,
 365 };
 366
 367 static int __init pxa2xx_mfp_init(void)
 368 {
 369         int i;
 370
 371         if (!cpu_is_pxa2xx())
 372                 return 0;
 373
 374         if (cpu_is_pxa25x())
 375                 pxa25x_mfp_init();
 376
 377         if (cpu_is_pxa27x())
 378                 pxa27x_mfp_init();
 379
 380         /* initialize gafr_run[], pgsr_lpm[] from existing values */
 381         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
 382                 gpdr_lpm[i] = GPDR(i * 32);
 383
 384         return sysdev_class_register(&pxa2xx_mfp_sysclass);
 385 }
 386 postcore_initcall(pxa2xx_mfp_init);