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 #include <linux/soc/pxa/cpu.h>
  20
  21 #include "pxa2xx-regs.h"
  22 #include "mfp-pxa2xx.h"
  23 #include "mfp-pxa27x.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 BANK_OFF(n)     (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
  33 #define GPLR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5))
  34 #define GPDR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c)
  35 #define GPSR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x18)
  36 #define GPCR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x24)
  37
  38 #define PWER_WE35       (1 << 24)
  39
  40 struct gpio_desc {
  41         unsigned        valid           : 1;
  42         unsigned        can_wakeup      : 1;
  43         unsigned        keypad_gpio     : 1;
  44         unsigned        dir_inverted    : 1;
  45         unsigned int    mask; /* bit mask in PWER or PKWR */
  46         unsigned int    mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
  47         unsigned long   config;
  48 };
  49
  50 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
  51
  52 static unsigned long gpdr_lpm[4];
  53
  54 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
  55 {
  56         unsigned long gafr, mask = GPIO_bit(gpio);
  57         int bank = gpio_to_bank(gpio);
  58         int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
  59         int shft = (gpio & 0xf) << 1;
  60         int fn = MFP_AF(c);
  61         int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
  62
  63         if (fn > 3)
  64                 return -EINVAL;
  65
  66         /* alternate function and direction at run-time */
  67         gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
  68         gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
  69
  70         if (uorl == 0)
  71                 GAFR_L(bank) = gafr;
  72         else
  73                 GAFR_U(bank) = gafr;
  74
  75         if (is_out ^ gpio_desc[gpio].dir_inverted)
  76                 GPDR(gpio) |= mask;
  77         else
  78                 GPDR(gpio) &= ~mask;
  79
  80         /* alternate function and direction at low power mode */
  81         switch (c & MFP_LPM_STATE_MASK) {
  82         case MFP_LPM_DRIVE_HIGH:
  83                 PGSR(bank) |= mask;
  84                 is_out = 1;
  85                 break;
  86         case MFP_LPM_DRIVE_LOW:
  87                 PGSR(bank) &= ~mask;
  88                 is_out = 1;
  89                 break;
  90         case MFP_LPM_INPUT:
  91         case MFP_LPM_DEFAULT:
  92                 break;
  93         default:
  94                 /* warning and fall through, treat as MFP_LPM_DEFAULT */
  95                 pr_warn("%s: GPIO%d: unsupported low power mode\n",
  96                         __func__, gpio);
  97                 break;
  98         }
  99
 100         if (is_out ^ gpio_desc[gpio].dir_inverted)
 101                 gpdr_lpm[bank] |= mask;
 102         else
 103                 gpdr_lpm[bank] &= ~mask;
 104
 105         /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
 106          * configurations of those pins not able to wakeup
 107          */
 108         if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
 109                 pr_warn("%s: GPIO%d unable to wakeup\n", __func__, gpio);
 110                 return -EINVAL;
 111         }
 112
 113         if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
 114                 pr_warn("%s: output GPIO%d unable to wakeup\n", __func__, gpio);
 115                 return -EINVAL;
 116         }
 117
 118         return 0;
 119 }
 120
 121 static inline int __mfp_validate(int mfp)
 122 {
 123         int gpio = mfp_to_gpio(mfp);
 124
 125         if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
 126                 pr_warn("%s: GPIO%d is invalid pin\n", __func__, gpio);
 127                 return -1;
 128         }
 129
 130         return gpio;
 131 }
 132
 133 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
 134 {
 135         unsigned long flags;
 136         unsigned long *c;
 137         int i, gpio;
 138
 139         for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
 140
 141                 gpio = __mfp_validate(MFP_PIN(*c));
 142                 if (gpio < 0)
 143                         continue;
 144
 145                 local_irq_save(flags);
 146
 147                 gpio_desc[gpio].config = *c;
 148                 __mfp_config_gpio(gpio, *c);
 149
 150                 local_irq_restore(flags);
 151         }
 152 }
 153
 154 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
 155 {
 156         unsigned long flags, c;
 157         int gpio;
 158
 159         gpio = __mfp_validate(mfp);
 160         if (gpio < 0)
 161                 return;
 162
 163         local_irq_save(flags);
 164
 165         c = gpio_desc[gpio].config;
 166         c = (c & ~MFP_LPM_STATE_MASK) | lpm;
 167         __mfp_config_gpio(gpio, c);
 168
 169         local_irq_restore(flags);
 170 }
 171
 172 int gpio_set_wake(unsigned int gpio, unsigned int on)
 173 {
 174         struct gpio_desc *d;
 175         unsigned long c, mux_taken;
 176
 177         if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
 178                 return -EINVAL;
 179
 180         d = &gpio_desc[gpio];
 181         c = d->config;
 182
 183         if (!d->valid)
 184                 return -EINVAL;
 185
 186         /* Allow keypad GPIOs to wakeup system when
 187          * configured as generic GPIOs.
 188          */
 189         if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
 190             (d->config & MFP_LPM_CAN_WAKEUP)) {
 191                 if (on)
 192                         PKWR |= d->mask;
 193                 else
 194                         PKWR &= ~d->mask;
 195                 return 0;
 196         }
 197
 198         mux_taken = (PWER & d->mux_mask) & (~d->mask);
 199         if (on && mux_taken)
 200                 return -EBUSY;
 201
 202         if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
 203                 if (on) {
 204                         PWER = (PWER & ~d->mux_mask) | d->mask;
 205
 206                         if (c & MFP_LPM_EDGE_RISE)
 207                                 PRER |= d->mask;
 208                         else
 209                                 PRER &= ~d->mask;
 210
 211                         if (c & MFP_LPM_EDGE_FALL)
 212                                 PFER |= d->mask;
 213                         else
 214                                 PFER &= ~d->mask;
 215                 } else {
 216                         PWER &= ~d->mask;
 217                         PRER &= ~d->mask;
 218                         PFER &= ~d->mask;
 219                 }
 220         }
 221         return 0;
 222 }
 223
 224 #ifdef CONFIG_PXA25x
 225 static void __init pxa25x_mfp_init(void)
 226 {
 227         int i;
 228
 229         /* running before pxa_gpio_probe() */
 230         pxa_last_gpio = 84;
 231         for (i = 0; i <= pxa_last_gpio; i++)
 232                 gpio_desc[i].valid = 1;
 233
 234         for (i = 0; i <= 15; i++) {
 235                 gpio_desc[i].can_wakeup = 1;
 236                 gpio_desc[i].mask = GPIO_bit(i);
 237         }
 238
 239         /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
 240          * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
 241          */
 242         for (i = 86; i <= pxa_last_gpio; i++)
 243                 gpio_desc[i].dir_inverted = 1;
 244 }
 245 #else
 246 static inline void pxa25x_mfp_init(void) {}
 247 #endif /* CONFIG_PXA25x */
 248
 249 #ifdef CONFIG_PXA27x
 250 static int pxa27x_pkwr_gpio[] = {
 251         13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
 252         95, 96, 97, 98, 99, 100, 101, 102
 253 };
 254
 255 int keypad_set_wake(unsigned int on)
 256 {
 257         unsigned int i, gpio, mask = 0;
 258         struct gpio_desc *d;
 259
 260         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 261
 262                 gpio = pxa27x_pkwr_gpio[i];
 263                 d = &gpio_desc[gpio];
 264
 265                 /* skip if configured as generic GPIO */
 266                 if (MFP_AF(d->config) == 0)
 267                         continue;
 268
 269                 if (d->config & MFP_LPM_CAN_WAKEUP)
 270                         mask |= gpio_desc[gpio].mask;
 271         }
 272
 273         if (on)
 274                 PKWR |= mask;
 275         else
 276                 PKWR &= ~mask;
 277         return 0;
 278 }
 279
 280 #define PWER_WEMUX2_GPIO38      (1 << 16)
 281 #define PWER_WEMUX2_GPIO53      (2 << 16)
 282 #define PWER_WEMUX2_GPIO40      (3 << 16)
 283 #define PWER_WEMUX2_GPIO36      (4 << 16)
 284 #define PWER_WEMUX2_MASK        (7 << 16)
 285 #define PWER_WEMUX3_GPIO31      (1 << 19)
 286 #define PWER_WEMUX3_GPIO113     (2 << 19)
 287 #define PWER_WEMUX3_MASK        (3 << 19)
 288
 289 #define INIT_GPIO_DESC_MUXED(mux, gpio)                         \
 290 do {                                                            \
 291         gpio_desc[(gpio)].can_wakeup = 1;                       \
 292         gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio;  \
 293         gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK;     \
 294 } while (0)
 295
 296 static void __init pxa27x_mfp_init(void)
 297 {
 298         int i, gpio;
 299
 300         pxa_last_gpio = 120;    /* running before pxa_gpio_probe() */
 301         for (i = 0; i <= pxa_last_gpio; i++) {
 302                 /* skip GPIO2, 5, 6, 7, 8, they are not
 303                  * valid pins allow configuration
 304                  */
 305                 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
 306                         continue;
 307
 308                 gpio_desc[i].valid = 1;
 309         }
 310
 311         /* Keypad GPIOs */
 312         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 313                 gpio = pxa27x_pkwr_gpio[i];
 314                 gpio_desc[gpio].can_wakeup = 1;
 315                 gpio_desc[gpio].keypad_gpio = 1;
 316                 gpio_desc[gpio].mask = 1 << i;
 317         }
 318
 319         /* Overwrite GPIO13 as a PWER wakeup source */
 320         for (i = 0; i <= 15; i++) {
 321                 /* skip GPIO2, 5, 6, 7, 8 */
 322                 if (GPIO_bit(i) & 0x1e4)
 323                         continue;
 324
 325                 gpio_desc[i].can_wakeup = 1;
 326                 gpio_desc[i].mask = GPIO_bit(i);
 327         }
 328
 329         gpio_desc[35].can_wakeup = 1;
 330         gpio_desc[35].mask = PWER_WE35;
 331
 332         INIT_GPIO_DESC_MUXED(WEMUX3, 31);
 333         INIT_GPIO_DESC_MUXED(WEMUX3, 113);
 334         INIT_GPIO_DESC_MUXED(WEMUX2, 38);
 335         INIT_GPIO_DESC_MUXED(WEMUX2, 53);
 336         INIT_GPIO_DESC_MUXED(WEMUX2, 40);
 337         INIT_GPIO_DESC_MUXED(WEMUX2, 36);
 338 }
 339 #else
 340 static inline void pxa27x_mfp_init(void) {}
 341 #endif /* CONFIG_PXA27x */
 342
 343 #ifdef CONFIG_PM
 344 static unsigned long saved_gafr[2][4];
 345 static unsigned long saved_gpdr[4];
 346 static unsigned long saved_gplr[4];
 347 static unsigned long saved_pgsr[4];
 348
 349 static int pxa2xx_mfp_suspend(void)
 350 {
 351         int i;
 352
 353         /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
 354         for (i = 0; i < pxa_last_gpio; i++) {
 355                 if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
 356                     (GPDR(i) & GPIO_bit(i))) {
 357                         if (GPLR(i) & GPIO_bit(i))
 358                                 PGSR(gpio_to_bank(i)) |= GPIO_bit(i);
 359                         else
 360                                 PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
 361                 }
 362         }
 363
 364         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
 365                 saved_gafr[0][i] = GAFR_L(i);
 366                 saved_gafr[1][i] = GAFR_U(i);
 367                 saved_gpdr[i] = GPDR(i * 32);
 368                 saved_gplr[i] = GPLR(i * 32);
 369                 saved_pgsr[i] = PGSR(i);
 370
 371                 GPSR(i * 32) = PGSR(i);
 372                 GPCR(i * 32) = ~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                 GPSR(i * 32) = saved_gplr[i];
 396                 GPCR(i * 32) = ~saved_gplr[i];
 397                 GPDR(i * 32) = saved_gpdr[i];
 398                 PGSR(i) = saved_pgsr[i];
 399         }
 400         PSSR = PSSR_RDH | PSSR_PH;
 401 }
 402 #else
 403 #define pxa2xx_mfp_suspend      NULL
 404 #define pxa2xx_mfp_resume       NULL
 405 #endif
 406
 407 struct syscore_ops pxa2xx_mfp_syscore_ops = {
 408         .suspend        = pxa2xx_mfp_suspend,
 409         .resume         = pxa2xx_mfp_resume,
 410 };
 411
 412 static int __init pxa2xx_mfp_init(void)
 413 {
 414         int i;
 415
 416         if (!cpu_is_pxa2xx())
 417                 return 0;
 418
 419         if (cpu_is_pxa25x())
 420                 pxa25x_mfp_init();
 421
 422         if (cpu_is_pxa27x())
 423                 pxa27x_mfp_init();
 424
 425         /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
 426         PSSR = PSSR_RDH;
 427
 428         /* initialize gafr_run[], pgsr_lpm[] from existing values */
 429         for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
 430                 gpdr_lpm[i] = GPDR(i * 32);
 431
 432         return 0;
 433 }
 434 postcore_initcall(pxa2xx_mfp_init);