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

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/arch/arm/mach-pxa/mfp-pxa2xx.c
   4  *
   5  *  PXA2xx pin mux configuration support
   6  *
   7  *  The GPIOs on PXA2xx can be configured as one of many alternate
   8  *  functions, this is by concept samilar to the MFP configuration
   9  *  on PXA3xx,  what's more important, the low power pin state and
  10  *  wakeup detection are also supported by the same framework.
  11  */
  12 #include <linux/gpio.h>
  13 #include <linux/gpio-pxa.h>
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/init.h>
  17 #include <linux/io.h>
  18 #include <linux/syscore_ops.h>
  19
  20 #include <mach/pxa2xx-regs.h>
  21 #include "mfp-pxa2xx.h"
  22
  23 #include "generic.h"
  24
  25 #define PGSR(x)         __REG2(0x40F00020, (x) << 2)
  26 #define __GAFR(u, x)    __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
  27 #define GAFR_L(x)       __GAFR(0, x)
  28 #define GAFR_U(x)       __GAFR(1, x)
  29
  30 #define BANK_OFF(n)     (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
  31 #define GPLR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5))
  32 #define GPDR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c)
  33 #define GPSR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x18)
  34 #define GPCR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x24)
  35
  36 #define PWER_WE35       (1 << 24)
  37
  38 struct gpio_desc {
  39         unsigned        valid           : 1;
  40         unsigned        can_wakeup      : 1;
  41         unsigned        keypad_gpio     : 1;
  42         unsigned        dir_inverted    : 1;
  43         unsigned int    mask; /* bit mask in PWER or PKWR */
  44         unsigned int    mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
  45         unsigned long   config;
  46 };
  47
  48 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
  49
  50 static unsigned long gpdr_lpm[4];
  51
  52 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
  53 {
  54         unsigned long gafr, mask = GPIO_bit(gpio);
  55         int bank = gpio_to_bank(gpio);
  56         int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
  57         int shft = (gpio & 0xf) << 1;
  58         int fn = MFP_AF(c);
  59         int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
  60
  61         if (fn > 3)
  62                 return -EINVAL;
  63
  64         /* alternate function and direction at run-time */
  65         gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
  66         gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
  67
  68         if (uorl == 0)
  69                 GAFR_L(bank) = gafr;
  70         else
  71                 GAFR_U(bank) = gafr;
  72
  73         if (is_out ^ gpio_desc[gpio].dir_inverted)
  74                 GPDR(gpio) |= mask;
  75         else
  76                 GPDR(gpio) &= ~mask;
  77
  78         /* alternate function and direction at low power mode */
  79         switch (c & MFP_LPM_STATE_MASK) {
  80         case MFP_LPM_DRIVE_HIGH:
  81                 PGSR(bank) |= mask;
  82                 is_out = 1;
  83                 break;
  84         case MFP_LPM_DRIVE_LOW:
  85                 PGSR(bank) &= ~mask;
  86                 is_out = 1;
  87                 break;
  88         case MFP_LPM_INPUT:
  89         case MFP_LPM_DEFAULT:
  90                 break;
  91         default:
  92                 /* warning and fall through, treat as MFP_LPM_DEFAULT */
  93                 pr_warn("%s: GPIO%d: unsupported low power mode\n",
  94                         __func__, gpio);
  95                 break;
  96         }
  97
  98         if (is_out ^ gpio_desc[gpio].dir_inverted)
  99                 gpdr_lpm[bank] |= mask;
 100         else
 101                 gpdr_lpm[bank] &= ~mask;
 102
 103         /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
 104          * configurations of those pins not able to wakeup
 105          */
 106         if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
 107                 pr_warn("%s: GPIO%d unable to wakeup\n", __func__, gpio);
 108                 return -EINVAL;
 109         }
 110
 111         if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
 112                 pr_warn("%s: output GPIO%d unable to wakeup\n", __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_warn("%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         /* Allow keypad GPIOs to wakeup system when
 185          * configured as generic GPIOs.
 186          */
 187         if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
 188             (d->config & MFP_LPM_CAN_WAKEUP)) {
 189                 if (on)
 190                         PKWR |= d->mask;
 191                 else
 192                         PKWR &= ~d->mask;
 193                 return 0;
 194         }
 195
 196         mux_taken = (PWER & d->mux_mask) & (~d->mask);
 197         if (on && mux_taken)
 198                 return -EBUSY;
 199
 200         if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
 201                 if (on) {
 202                         PWER = (PWER & ~d->mux_mask) | d->mask;
 203
 204                         if (c & MFP_LPM_EDGE_RISE)
 205                                 PRER |= d->mask;
 206                         else
 207                                 PRER &= ~d->mask;
 208
 209                         if (c & MFP_LPM_EDGE_FALL)
 210                                 PFER |= d->mask;
 211                         else
 212                                 PFER &= ~d->mask;
 213                 } else {
 214                         PWER &= ~d->mask;
 215                         PRER &= ~d->mask;
 216                         PFER &= ~d->mask;
 217                 }
 218         }
 219         return 0;
 220 }
 221
 222 #ifdef CONFIG_PXA25x
 223 static void __init pxa25x_mfp_init(void)
 224 {
 225         int i;
 226
 227         /* running before pxa_gpio_probe() */
 228 #ifdef CONFIG_CPU_PXA26x
 229         pxa_last_gpio = 89;
 230 #else
 231         pxa_last_gpio = 84;
 232 #endif
 233         for (i = 0; i <= pxa_last_gpio; i++)
 234                 gpio_desc[i].valid = 1;
 235
 236         for (i = 0; i <= 15; i++) {
 237                 gpio_desc[i].can_wakeup = 1;
 238                 gpio_desc[i].mask = GPIO_bit(i);
 239         }
 240
 241         /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
 242          * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
 243          */
 244         for (i = 86; i <= pxa_last_gpio; i++)
 245                 gpio_desc[i].dir_inverted = 1;
 246 }
 247 #else
 248 static inline void pxa25x_mfp_init(void) {}
 249 #endif /* CONFIG_PXA25x */
 250
 251 #ifdef CONFIG_PXA27x
 252 static int pxa27x_pkwr_gpio[] = {
 253         13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
 254         95, 96, 97, 98, 99, 100, 101, 102
 255 };
 256
 257 int keypad_set_wake(unsigned int on)
 258 {
 259         unsigned int i, gpio, mask = 0;
 260         struct gpio_desc *d;
 261
 262         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 263
 264                 gpio = pxa27x_pkwr_gpio[i];
 265                 d = &gpio_desc[gpio];
 266
 267                 /* skip if configured as generic GPIO */
 268                 if (MFP_AF(d->config) == 0)
 269                         continue;
 270
 271                 if (d->config & MFP_LPM_CAN_WAKEUP)
 272                         mask |= gpio_desc[gpio].mask;
 273         }
 274
 275         if (on)
 276                 PKWR |= mask;
 277         else
 278                 PKWR &= ~mask;
 279         return 0;
 280 }
 281
 282 #define PWER_WEMUX2_GPIO38      (1 << 16)
 283 #define PWER_WEMUX2_GPIO53      (2 << 16)
 284 #define PWER_WEMUX2_GPIO40      (3 << 16)
 285 #define PWER_WEMUX2_GPIO36      (4 << 16)
 286 #define PWER_WEMUX2_MASK        (7 << 16)
 287 #define PWER_WEMUX3_GPIO31      (1 << 19)
 288 #define PWER_WEMUX3_GPIO113     (2 << 19)
 289 #define PWER_WEMUX3_MASK        (3 << 19)
 290
 291 #define INIT_GPIO_DESC_MUXED(mux, gpio)                         \
 292 do {                                                            \
 293         gpio_desc[(gpio)].can_wakeup = 1;                       \
 294         gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio;  \
 295         gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK;     \
 296 } while (0)
 297
 298 static void __init pxa27x_mfp_init(void)
 299 {
 300         int i, gpio;
 301
 302         pxa_last_gpio = 120;    /* running before pxa_gpio_probe() */
 303         for (i = 0; i <= pxa_last_gpio; i++) {
 304                 /* skip GPIO2, 5, 6, 7, 8, they are not
 305                  * valid pins allow configuration
 306                  */
 307                 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
 308                         continue;
 309
 310                 gpio_desc[i].valid = 1;
 311         }
 312
 313         /* Keypad GPIOs */
 314         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 315                 gpio = pxa27x_pkwr_gpio[i];
 316                 gpio_desc[gpio].can_wakeup = 1;
 317                 gpio_desc[gpio].keypad_gpio = 1;
 318                 gpio_desc[gpio].mask = 1 << i;
 319         }
 320
 321         /* Overwrite GPIO13 as a PWER wakeup source */
 322         for (i = 0; i <= 15; i++) {
 323                 /* skip GPIO2, 5, 6, 7, 8 */
 324                 if (GPIO_bit(i) & 0x1e4)
 325                         continue;
 326
 327                 gpio_desc[i].can_wakeup = 1;
 328                 gpio_desc[i].mask = GPIO_bit(i);
 329         }
 330
 331         gpio_desc[35].can_wakeup = 1;
 332         gpio_desc[35].mask = PWER_WE35;
 333
 334         INIT_GPIO_DESC_MUXED(WEMUX3, 31);
 335         INIT_GPIO_DESC_MUXED(WEMUX3, 113);
 336         INIT_GPIO_DESC_MUXED(WEMUX2, 38);
 337         INIT_GPIO_DESC_MUXED(WEMUX2, 53);
 338         INIT_GPIO_DESC_MUXED(WEMUX2, 40);
 339         INIT_GPIO_DESC_MUXED(WEMUX2, 36);
 340 }
 341 #else
 342 static inline void pxa27x_mfp_init(void) {}
 343 #endif /* CONFIG_PXA27x */
 344
 345 #ifdef CONFIG_PM
 346 static unsigned long saved_gafr[2][4];
 347 static unsigned long saved_gpdr[4];
 348 static unsigned long saved_gplr[4];
 349 static unsigned long saved_pgsr[4];
 350
 351 static int pxa2xx_mfp_suspend(void)
 352 {
 353         int i;
 354
 355         /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
 356         for (i = 0; i < pxa_last_gpio; i++) {
 357                 if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
 358                     (GPDR(i) & GPIO_bit(i))) {
 359                         if (GPLR(i) & GPIO_bit(i))
 360                                 PGSR(gpio_to_bank(i)) |= GPIO_bit(i);
 361                         else
 362                                 PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
 363                 }
 364         }
 365
 366         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
 367                 saved_gafr[0][i] = GAFR_L(i);
 368                 saved_gafr[1][i] = GAFR_U(i);
 369                 saved_gpdr[i] = GPDR(i * 32);
 370                 saved_gplr[i] = GPLR(i * 32);
 371                 saved_pgsr[i] = PGSR(i);
 372
 373                 GPSR(i * 32) = PGSR(i);
 374                 GPCR(i * 32) = ~PGSR(i);
 375         }
 376
 377         /* set GPDR bits taking into account MFP_LPM_KEEP_OUTPUT */
 378         for (i = 0; i < pxa_last_gpio; i++) {
 379                 if ((gpdr_lpm[gpio_to_bank(i)] & GPIO_bit(i)) ||
 380                     ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
 381                      (saved_gpdr[gpio_to_bank(i)] & GPIO_bit(i))))
 382                         GPDR(i) |= GPIO_bit(i);
 383                 else
 384                         GPDR(i) &= ~GPIO_bit(i);
 385         }
 386
 387         return 0;
 388 }
 389
 390 static void pxa2xx_mfp_resume(void)
 391 {
 392         int i;
 393
 394         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
 395                 GAFR_L(i) = saved_gafr[0][i];
 396                 GAFR_U(i) = saved_gafr[1][i];
 397                 GPSR(i * 32) = saved_gplr[i];
 398                 GPCR(i * 32) = ~saved_gplr[i];
 399                 GPDR(i * 32) = saved_gpdr[i];
 400                 PGSR(i) = saved_pgsr[i];
 401         }
 402         PSSR = PSSR_RDH | PSSR_PH;
 403 }
 404 #else
 405 #define pxa2xx_mfp_suspend      NULL
 406 #define pxa2xx_mfp_resume       NULL
 407 #endif
 408
 409 struct syscore_ops pxa2xx_mfp_syscore_ops = {
 410         .suspend        = pxa2xx_mfp_suspend,
 411         .resume         = pxa2xx_mfp_resume,
 412 };
 413
 414 static int __init pxa2xx_mfp_init(void)
 415 {
 416         int i;
 417
 418         if (!cpu_is_pxa2xx())
 419                 return 0;
 420
 421         if (cpu_is_pxa25x())
 422                 pxa25x_mfp_init();
 423
 424         if (cpu_is_pxa27x())
 425                 pxa27x_mfp_init();
 426
 427         /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
 428         PSSR = PSSR_RDH;
 429
 430         /* initialize gafr_run[], pgsr_lpm[] from existing values */
 431         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
 432                 gpdr_lpm[i] = GPDR(i * 32);
 433
 434         return 0;
 435 }
 436 postcore_initcall(pxa2xx_mfp_init);