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/gpio.h>
  22 #include <mach/pxa2xx-regs.h>
  23 #include <mach/mfp-pxa2xx.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_DEFAULT:
  85                 break;
  86         default:
  87                 /* warning and fall through, treat as MFP_LPM_DEFAULT */
  88                 pr_warning("%s: GPIO%d: unsupported low power mode\n",
  89                                 __func__, gpio);
  90                 break;
  91         }
  92
  93         if (is_out ^ gpio_desc[gpio].dir_inverted)
  94                 gpdr_lpm[bank] |= mask;
  95         else
  96                 gpdr_lpm[bank] &= ~mask;
  97
  98         /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
  99          * configurations of those pins not able to wakeup
 100          */
 101         if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
 102                 pr_warning("%s: GPIO%d unable to wakeup\n",
 103                                 __func__, gpio);
 104                 return -EINVAL;
 105         }
 106
 107         if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
 108                 pr_warning("%s: output GPIO%d unable to wakeup\n",
 109                                 __func__, gpio);
 110                 return -EINVAL;
 111         }
 112
 113         return 0;
 114 }
 115
 116 static inline int __mfp_validate(int mfp)
 117 {
 118         int gpio = mfp_to_gpio(mfp);
 119
 120         if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
 121                 pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
 122                 return -1;
 123         }
 124
 125         return gpio;
 126 }
 127
 128 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
 129 {
 130         unsigned long flags;
 131         unsigned long *c;
 132         int i, gpio;
 133
 134         for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
 135
 136                 gpio = __mfp_validate(MFP_PIN(*c));
 137                 if (gpio < 0)
 138                         continue;
 139
 140                 local_irq_save(flags);
 141
 142                 gpio_desc[gpio].config = *c;
 143                 __mfp_config_gpio(gpio, *c);
 144
 145                 local_irq_restore(flags);
 146         }
 147 }
 148
 149 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
 150 {
 151         unsigned long flags, c;
 152         int gpio;
 153
 154         gpio = __mfp_validate(mfp);
 155         if (gpio < 0)
 156                 return;
 157
 158         local_irq_save(flags);
 159
 160         c = gpio_desc[gpio].config;
 161         c = (c & ~MFP_LPM_STATE_MASK) | lpm;
 162         __mfp_config_gpio(gpio, c);
 163
 164         local_irq_restore(flags);
 165 }
 166
 167 int gpio_set_wake(unsigned int gpio, unsigned int on)
 168 {
 169         struct gpio_desc *d;
 170         unsigned long c, mux_taken;
 171
 172         if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
 173                 return -EINVAL;
 174
 175         d = &gpio_desc[gpio];
 176         c = d->config;
 177
 178         if (!d->valid)
 179                 return -EINVAL;
 180
 181         if (d->keypad_gpio)
 182                 return -EINVAL;
 183
 184         mux_taken = (PWER & d->mux_mask) & (~d->mask);
 185         if (on && mux_taken)
 186                 return -EBUSY;
 187
 188         if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
 189                 if (on) {
 190                         PWER = (PWER & ~d->mux_mask) | d->mask;
 191
 192                         if (c & MFP_LPM_EDGE_RISE)
 193                                 PRER |= d->mask;
 194                         else
 195                                 PRER &= ~d->mask;
 196
 197                         if (c & MFP_LPM_EDGE_FALL)
 198                                 PFER |= d->mask;
 199                         else
 200                                 PFER &= ~d->mask;
 201                 } else {
 202                         PWER &= ~d->mask;
 203                         PRER &= ~d->mask;
 204                         PFER &= ~d->mask;
 205                 }
 206         }
 207         return 0;
 208 }
 209
 210 #ifdef CONFIG_PXA25x
 211 static void __init pxa25x_mfp_init(void)
 212 {
 213         int i;
 214
 215         for (i = 0; i <= pxa_last_gpio; i++)
 216                 gpio_desc[i].valid = 1;
 217
 218         for (i = 0; i <= 15; i++) {
 219                 gpio_desc[i].can_wakeup = 1;
 220                 gpio_desc[i].mask = GPIO_bit(i);
 221         }
 222
 223         /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
 224          * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
 225          */
 226         for (i = 86; i <= pxa_last_gpio; i++)
 227                 gpio_desc[i].dir_inverted = 1;
 228 }
 229 #else
 230 static inline void pxa25x_mfp_init(void) {}
 231 #endif /* CONFIG_PXA25x */
 232
 233 #ifdef CONFIG_PXA27x
 234 static int pxa27x_pkwr_gpio[] = {
 235         13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
 236         95, 96, 97, 98, 99, 100, 101, 102
 237 };
 238
 239 int keypad_set_wake(unsigned int on)
 240 {
 241         unsigned int i, gpio, mask = 0;
 242
 243         if (!on) {
 244                 PKWR = 0;
 245                 return 0;
 246         }
 247
 248         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 249
 250                 gpio = pxa27x_pkwr_gpio[i];
 251
 252                 if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP)
 253                         mask |= gpio_desc[gpio].mask;
 254         }
 255
 256         PKWR = mask;
 257         return 0;
 258 }
 259
 260 #define PWER_WEMUX2_GPIO38      (1 << 16)
 261 #define PWER_WEMUX2_GPIO53      (2 << 16)
 262 #define PWER_WEMUX2_GPIO40      (3 << 16)
 263 #define PWER_WEMUX2_GPIO36      (4 << 16)
 264 #define PWER_WEMUX2_MASK        (7 << 16)
 265 #define PWER_WEMUX3_GPIO31      (1 << 19)
 266 #define PWER_WEMUX3_GPIO113     (2 << 19)
 267 #define PWER_WEMUX3_MASK        (3 << 19)
 268
 269 #define INIT_GPIO_DESC_MUXED(mux, gpio)                         \
 270 do {                                                            \
 271         gpio_desc[(gpio)].can_wakeup = 1;                       \
 272         gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio;  \
 273         gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK;     \
 274 } while (0)
 275
 276 static void __init pxa27x_mfp_init(void)
 277 {
 278         int i, gpio;
 279
 280         for (i = 0; i <= pxa_last_gpio; i++) {
 281                 /* skip GPIO2, 5, 6, 7, 8, they are not
 282                  * valid pins allow configuration
 283                  */
 284                 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
 285                         continue;
 286
 287                 gpio_desc[i].valid = 1;
 288         }
 289
 290         /* Keypad GPIOs */
 291         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 292                 gpio = pxa27x_pkwr_gpio[i];
 293                 gpio_desc[gpio].can_wakeup = 1;
 294                 gpio_desc[gpio].keypad_gpio = 1;
 295                 gpio_desc[gpio].mask = 1 << i;
 296         }
 297
 298         /* Overwrite GPIO13 as a PWER wakeup source */
 299         for (i = 0; i <= 15; i++) {
 300                 /* skip GPIO2, 5, 6, 7, 8 */
 301                 if (GPIO_bit(i) & 0x1e4)
 302                         continue;
 303
 304                 gpio_desc[i].can_wakeup = 1;
 305                 gpio_desc[i].mask = GPIO_bit(i);
 306         }
 307
 308         gpio_desc[35].can_wakeup = 1;
 309         gpio_desc[35].mask = PWER_WE35;
 310
 311         INIT_GPIO_DESC_MUXED(WEMUX3, 31);
 312         INIT_GPIO_DESC_MUXED(WEMUX3, 113);
 313         INIT_GPIO_DESC_MUXED(WEMUX2, 38);
 314         INIT_GPIO_DESC_MUXED(WEMUX2, 53);
 315         INIT_GPIO_DESC_MUXED(WEMUX2, 40);
 316         INIT_GPIO_DESC_MUXED(WEMUX2, 36);
 317 }
 318 #else
 319 static inline void pxa27x_mfp_init(void) {}
 320 #endif /* CONFIG_PXA27x */
 321
 322 #ifdef CONFIG_PM
 323 static unsigned long saved_gafr[2][4];
 324 static unsigned long saved_gpdr[4];
 325 static unsigned long saved_pgsr[4];
 326
 327 static int pxa2xx_mfp_suspend(struct sys_device *d, pm_message_t state)
 328 {
 329         int i;
 330
 331         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
 332
 333                 saved_gafr[0][i] = GAFR_L(i);
 334                 saved_gafr[1][i] = GAFR_U(i);
 335                 saved_gpdr[i] = GPDR(i * 32);
 336                 saved_pgsr[i] = PGSR(i);
 337
 338                 GPDR(i * 32) = gpdr_lpm[i];
 339         }
 340         return 0;
 341 }
 342
 343 static int pxa2xx_mfp_resume(struct sys_device *d)
 344 {
 345         int i;
 346
 347         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
 348                 GAFR_L(i) = saved_gafr[0][i];
 349                 GAFR_U(i) = saved_gafr[1][i];
 350                 GPDR(i * 32) = saved_gpdr[i];
 351                 PGSR(i) = saved_pgsr[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         /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
 381         PSSR = PSSR_RDH;
 382
 383         /* initialize gafr_run[], pgsr_lpm[] from existing values */
 384         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
 385                 gpdr_lpm[i] = GPDR(i * 32);
 386
 387         return sysdev_class_register(&pxa2xx_mfp_sysclass);
 388 }
 389 postcore_initcall(pxa2xx_mfp_init);