LXR linux/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#include <linux/gpio.h>
  16#include <linux/module.h>
  17#include <linux/kernel.h>
  18#include <linux/init.h>
  19#include <linux/syscore_ops.h>
  20
  21#include <mach/pxa2xx-regs.h>
  22#include <mach/mfp-pxa2xx.h>
  23#include <mach/gpio-pxa.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
  34struct 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
  44static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
  45
  46static unsigned long gpdr_lpm[4];
  47
  48static 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_INPUT:
  85        case MFP_LPM_DEFAULT:
  86                break;
  87        default:
  88                /* warning and fall through, treat as MFP_LPM_DEFAULT */
  89                pr_warning("%s: GPIO%d: unsupported low power mode\n",
  90                                __func__, gpio);
  91                break;
  92        }
  93
  94        if (is_out ^ gpio_desc[gpio].dir_inverted)
  95                gpdr_lpm[bank] |= mask;
  96        else
  97                gpdr_lpm[bank] &= ~mask;
  98
  99        /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
 100         * configurations of those pins not able to wakeup
 101         */
 102        if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
 103                pr_warning("%s: GPIO%d unable to wakeup\n",
 104                                __func__, gpio);
 105                return -EINVAL;
 106        }
 107
 108        if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
 109                pr_warning("%s: output GPIO%d unable to wakeup\n",
 110                                __func__, gpio);
 111                return -EINVAL;
 112        }
 113
 114        return 0;
 115}
 116
 117static inline int __mfp_validate(int mfp)
 118{
 119        int gpio = mfp_to_gpio(mfp);
 120
 121        if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
 122                pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
 123                return -1;
 124        }
 125
 126        return gpio;
 127}
 128
 129void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
 130{
 131        unsigned long flags;
 132        unsigned long *c;
 133        int i, gpio;
 134
 135        for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
 136
 137                gpio = __mfp_validate(MFP_PIN(*c));
 138                if (gpio < 0)
 139                        continue;
 140
 141                local_irq_save(flags);
 142
 143                gpio_desc[gpio].config = *c;
 144                __mfp_config_gpio(gpio, *c);
 145
 146                local_irq_restore(flags);
 147        }
 148}
 149
 150void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
 151{
 152        unsigned long flags, c;
 153        int gpio;
 154
 155        gpio = __mfp_validate(mfp);
 156        if (gpio < 0)
 157                return;
 158
 159        local_irq_save(flags);
 160
 161        c = gpio_desc[gpio].config;
 162        c = (c & ~MFP_LPM_STATE_MASK) | lpm;
 163        __mfp_config_gpio(gpio, c);
 164
 165        local_irq_restore(flags);
 166}
 167
 168int gpio_set_wake(unsigned int gpio, unsigned int on)
 169{
 170        struct gpio_desc *d;
 171        unsigned long c, mux_taken;
 172
 173        if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
 174                return -EINVAL;
 175
 176        d = &gpio_desc[gpio];
 177        c = d->config;
 178
 179        if (!d->valid)
 180                return -EINVAL;
 181
 182        /* Allow keypad GPIOs to wakeup system when
 183         * configured as generic GPIOs.
 184         */
 185        if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
 186            (d->config & MFP_LPM_CAN_WAKEUP)) {
 187                if (on)
 188                        PKWR |= d->mask;
 189                else
 190                        PKWR &= ~d->mask;
 191                return 0;
 192        }
 193
 194        mux_taken = (PWER & d->mux_mask) & (~d->mask);
 195        if (on && mux_taken)
 196                return -EBUSY;
 197
 198        if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
 199                if (on) {
 200                        PWER = (PWER & ~d->mux_mask) | d->mask;
 201
 202                        if (c & MFP_LPM_EDGE_RISE)
 203                                PRER |= d->mask;
 204                        else
 205                                PRER &= ~d->mask;
 206
 207                        if (c & MFP_LPM_EDGE_FALL)
 208                                PFER |= d->mask;
 209                        else
 210                                PFER &= ~d->mask;
 211                } else {
 212                        PWER &= ~d->mask;
 213                        PRER &= ~d->mask;
 214                        PFER &= ~d->mask;
 215                }
 216        }
 217        return 0;
 218}
 219
 220#ifdef CONFIG_PXA25x
 221static void __init pxa25x_mfp_init(void)
 222{
 223        int i;
 224
 225        for (i = 0; i <= pxa_last_gpio; i++)
 226                gpio_desc[i].valid = 1;
 227
 228        for (i = 0; i <= 15; i++) {
 229                gpio_desc[i].can_wakeup = 1;
 230                gpio_desc[i].mask = GPIO_bit(i);
 231        }
 232
 233        /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
 234         * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
 235         */
 236        for (i = 86; i <= pxa_last_gpio; i++)
 237                gpio_desc[i].dir_inverted = 1;
 238}
 239#else
 240static inline void pxa25x_mfp_init(void) {}
 241#endif /* CONFIG_PXA25x */
 242
 243#ifdef CONFIG_PXA27x
 244static int pxa27x_pkwr_gpio[] = {
 245        13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
 246        95, 96, 97, 98, 99, 100, 101, 102
 247};
 248
 249int keypad_set_wake(unsigned int on)
 250{
 251        unsigned int i, gpio, mask = 0;
 252        struct gpio_desc *d;
 253
 254        for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 255
 256                gpio = pxa27x_pkwr_gpio[i];
 257                d = &gpio_desc[gpio];
 258
 259                /* skip if configured as generic GPIO */
 260                if (MFP_AF(d->config) == 0)
 261                        continue;
 262
 263                if (d->config & MFP_LPM_CAN_WAKEUP)
 264                        mask |= gpio_desc[gpio].mask;
 265        }
 266
 267        if (on)
 268                PKWR |= mask;
 269        else
 270                PKWR &= ~mask;
 271        return 0;
 272}
 273
 274#define PWER_WEMUX2_GPIO38      (1 << 16)
 275#define PWER_WEMUX2_GPIO53      (2 << 16)
 276#define PWER_WEMUX2_GPIO40      (3 << 16)
 277#define PWER_WEMUX2_GPIO36      (4 << 16)
 278#define PWER_WEMUX2_MASK        (7 << 16)
 279#define PWER_WEMUX3_GPIO31      (1 << 19)
 280#define PWER_WEMUX3_GPIO113     (2 << 19)
 281#define PWER_WEMUX3_MASK        (3 << 19)
 282
 283#define INIT_GPIO_DESC_MUXED(mux, gpio)                         \
 284do {                                                            \
 285        gpio_desc[(gpio)].can_wakeup = 1;                       \
 286        gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio;  \
 287        gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK;     \
 288} while (0)
 289
 290static void __init pxa27x_mfp_init(void)
 291{
 292        int i, gpio;
 293
 294        for (i = 0; i <= pxa_last_gpio; i++) {
 295                /* skip GPIO2, 5, 6, 7, 8, they are not
 296                 * valid pins allow configuration
 297                 */
 298                if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
 299                        continue;
 300
 301                gpio_desc[i].valid = 1;
 302        }
 303
 304        /* Keypad GPIOs */
 305        for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 306                gpio = pxa27x_pkwr_gpio[i];
 307                gpio_desc[gpio].can_wakeup = 1;
 308                gpio_desc[gpio].keypad_gpio = 1;
 309                gpio_desc[gpio].mask = 1 << i;
 310        }
 311
 312        /* Overwrite GPIO13 as a PWER wakeup source */
 313        for (i = 0; i <= 15; i++) {
 314                /* skip GPIO2, 5, 6, 7, 8 */
 315                if (GPIO_bit(i) & 0x1e4)
 316                        continue;
 317
 318                gpio_desc[i].can_wakeup = 1;
 319                gpio_desc[i].mask = GPIO_bit(i);
 320        }
 321
 322        gpio_desc[35].can_wakeup = 1;
 323        gpio_desc[35].mask = PWER_WE35;
 324
 325        INIT_GPIO_DESC_MUXED(WEMUX3, 31);
 326        INIT_GPIO_DESC_MUXED(WEMUX3, 113);
 327        INIT_GPIO_DESC_MUXED(WEMUX2, 38);
 328        INIT_GPIO_DESC_MUXED(WEMUX2, 53);
 329        INIT_GPIO_DESC_MUXED(WEMUX2, 40);
 330        INIT_GPIO_DESC_MUXED(WEMUX2, 36);
 331}
 332#else
 333static inline void pxa27x_mfp_init(void) {}
 334#endif /* CONFIG_PXA27x */
 335
 336#ifdef CONFIG_PM
 337static unsigned long saved_gafr[2][4];
 338static unsigned long saved_gpdr[4];
 339static unsigned long saved_pgsr[4];
 340
 341static int pxa2xx_mfp_suspend(void)
 342{
 343        int i;
 344
 345        /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
 346        for (i = 0; i < pxa_last_gpio; i++) {
 347                if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
 348                    (GPDR(i) & GPIO_bit(i))) {
 349                        if (GPLR(i) & GPIO_bit(i))
 350                                PGSR(gpio_to_bank(i)) |= GPIO_bit(i);
 351                        else
 352                                PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
 353                }
 354        }
 355
 356        for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
 357
 358                saved_gafr[0][i] = GAFR_L(i);
 359                saved_gafr[1][i] = GAFR_U(i);
 360                saved_gpdr[i] = GPDR(i * 32);
 361                saved_pgsr[i] = PGSR(i);
 362
 363                GPDR(i * 32) = gpdr_lpm[i];
 364        }
 365        return 0;
 366}
 367
 368static void pxa2xx_mfp_resume(void)
 369{
 370        int i;
 371
 372        for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
 373                GAFR_L(i) = saved_gafr[0][i];
 374                GAFR_U(i) = saved_gafr[1][i];
 375                GPDR(i * 32) = saved_gpdr[i];
 376                PGSR(i) = saved_pgsr[i];
 377        }
 378        PSSR = PSSR_RDH | PSSR_PH;
 379}
 380#else
 381#define pxa2xx_mfp_suspend      NULL
 382#define pxa2xx_mfp_resume       NULL
 383#endif
 384
 385struct syscore_ops pxa2xx_mfp_syscore_ops = {
 386        .suspend        = pxa2xx_mfp_suspend,
 387        .resume         = pxa2xx_mfp_resume,
 388};
 389
 390static int __init pxa2xx_mfp_init(void)
 391{
 392        int i;
 393
 394        if (!cpu_is_pxa2xx())
 395                return 0;
 396
 397        if (cpu_is_pxa25x())
 398                pxa25x_mfp_init();
 399
 400        if (cpu_is_pxa27x())
 401                pxa27x_mfp_init();
 402
 403        /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
 404        PSSR = PSSR_RDH;
 405
 406        /* initialize gafr_run[], pgsr_lpm[] from existing values */
 407        for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
 408                gpdr_lpm[i] = GPDR(i * 32);
 409
 410        return 0;
 411}
 412postcore_initcall(pxa2xx_mfp_init);
 413