LXR linux/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
  38struct 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
  48static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
  49
  50static unsigned long gpdr_lpm[4];
  51
  52static 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
 119static 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
 131void 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
 152void 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
 170int 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
 223static 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
 248static inline void pxa25x_mfp_init(void) {}
 249#endif /* CONFIG_PXA25x */
 250
 251#ifdef CONFIG_PXA27x
 252static 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
 257int 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)                         \
 292do {                                                            \
 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
 298static 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
 342static inline void pxa27x_mfp_init(void) {}
 343#endif /* CONFIG_PXA27x */
 344
 345#ifdef CONFIG_PM
 346static unsigned long saved_gafr[2][4];
 347static unsigned long saved_gpdr[4];
 348static unsigned long saved_gplr[4];
 349static unsigned long saved_pgsr[4];
 350
 351static 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
 390static 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
 409struct syscore_ops pxa2xx_mfp_syscore_ops = {
 410        .suspend        = pxa2xx_mfp_suspend,
 411        .resume         = pxa2xx_mfp_resume,
 412};
 413
 414static 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}
 436postcore_initcall(pxa2xx_mfp_init);
 437