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/gpio-pxa.h>
  17#include <linux/module.h>
  18#include <linux/kernel.h>
  19#include <linux/init.h>
  20#include <linux/io.h>
  21#include <linux/syscore_ops.h>
  22
  23#include <mach/pxa2xx-regs.h>
  24#include "mfp-pxa2xx.h"
  25
  26#include "generic.h"
  27
  28#define PGSR(x)         __REG2(0x40F00020, (x) << 2)
  29#define __GAFR(u, x)    __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
  30#define GAFR_L(x)       __GAFR(0, x)
  31#define GAFR_U(x)       __GAFR(1, x)
  32
  33#define BANK_OFF(n)     (((n) < 3) ? (n) << 2 : 0x100 + (((n) - 3) << 2))
  34#define GPLR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5))
  35#define GPDR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x0c)
  36#define GPSR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x18)
  37#define GPCR(x)         __REG2(0x40E00000, BANK_OFF((x) >> 5) + 0x24)
  38
  39#define PWER_WE35       (1 << 24)
  40
  41struct gpio_desc {
  42        unsigned        valid           : 1;
  43        unsigned        can_wakeup      : 1;
  44        unsigned        keypad_gpio     : 1;
  45        unsigned        dir_inverted    : 1;
  46        unsigned int    mask; /* bit mask in PWER or PKWR */
  47        unsigned int    mux_mask; /* bit mask of muxed gpio bits, 0 if no mux */
  48        unsigned long   config;
  49};
  50
  51static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
  52
  53static unsigned long gpdr_lpm[4];
  54
  55static int __mfp_config_gpio(unsigned gpio, unsigned long c)
  56{
  57        unsigned long gafr, mask = GPIO_bit(gpio);
  58        int bank = gpio_to_bank(gpio);
  59        int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
  60        int shft = (gpio & 0xf) << 1;
  61        int fn = MFP_AF(c);
  62        int is_out = (c & MFP_DIR_OUT) ? 1 : 0;
  63
  64        if (fn > 3)
  65                return -EINVAL;
  66
  67        /* alternate function and direction at run-time */
  68        gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
  69        gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
  70
  71        if (uorl == 0)
  72                GAFR_L(bank) = gafr;
  73        else
  74                GAFR_U(bank) = gafr;
  75
  76        if (is_out ^ gpio_desc[gpio].dir_inverted)
  77                GPDR(gpio) |= mask;
  78        else
  79                GPDR(gpio) &= ~mask;
  80
  81        /* alternate function and direction at low power mode */
  82        switch (c & MFP_LPM_STATE_MASK) {
  83        case MFP_LPM_DRIVE_HIGH:
  84                PGSR(bank) |= mask;
  85                is_out = 1;
  86                break;
  87        case MFP_LPM_DRIVE_LOW:
  88                PGSR(bank) &= ~mask;
  89                is_out = 1;
  90                break;
  91        case MFP_LPM_INPUT:
  92        case MFP_LPM_DEFAULT:
  93                break;
  94        default:
  95                /* warning and fall through, treat as MFP_LPM_DEFAULT */
  96                pr_warn("%s: GPIO%d: unsupported low power mode\n",
  97                        __func__, gpio);
  98                break;
  99        }
 100
 101        if (is_out ^ gpio_desc[gpio].dir_inverted)
 102                gpdr_lpm[bank] |= mask;
 103        else
 104                gpdr_lpm[bank] &= ~mask;
 105
 106        /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
 107         * configurations of those pins not able to wakeup
 108         */
 109        if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
 110                pr_warn("%s: GPIO%d unable to wakeup\n", __func__, gpio);
 111                return -EINVAL;
 112        }
 113
 114        if ((c & MFP_LPM_CAN_WAKEUP) && is_out) {
 115                pr_warn("%s: output GPIO%d unable to wakeup\n", __func__, gpio);
 116                return -EINVAL;
 117        }
 118
 119        return 0;
 120}
 121
 122static inline int __mfp_validate(int mfp)
 123{
 124        int gpio = mfp_to_gpio(mfp);
 125
 126        if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
 127                pr_warn("%s: GPIO%d is invalid pin\n", __func__, gpio);
 128                return -1;
 129        }
 130
 131        return gpio;
 132}
 133
 134void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
 135{
 136        unsigned long flags;
 137        unsigned long *c;
 138        int i, gpio;
 139
 140        for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
 141
 142                gpio = __mfp_validate(MFP_PIN(*c));
 143                if (gpio < 0)
 144                        continue;
 145
 146                local_irq_save(flags);
 147
 148                gpio_desc[gpio].config = *c;
 149                __mfp_config_gpio(gpio, *c);
 150
 151                local_irq_restore(flags);
 152        }
 153}
 154
 155void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
 156{
 157        unsigned long flags, c;
 158        int gpio;
 159
 160        gpio = __mfp_validate(mfp);
 161        if (gpio < 0)
 162                return;
 163
 164        local_irq_save(flags);
 165
 166        c = gpio_desc[gpio].config;
 167        c = (c & ~MFP_LPM_STATE_MASK) | lpm;
 168        __mfp_config_gpio(gpio, c);
 169
 170        local_irq_restore(flags);
 171}
 172
 173int gpio_set_wake(unsigned int gpio, unsigned int on)
 174{
 175        struct gpio_desc *d;
 176        unsigned long c, mux_taken;
 177
 178        if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
 179                return -EINVAL;
 180
 181        d = &gpio_desc[gpio];
 182        c = d->config;
 183
 184        if (!d->valid)
 185                return -EINVAL;
 186
 187        /* Allow keypad GPIOs to wakeup system when
 188         * configured as generic GPIOs.
 189         */
 190        if (d->keypad_gpio && (MFP_AF(d->config) == 0) &&
 191            (d->config & MFP_LPM_CAN_WAKEUP)) {
 192                if (on)
 193                        PKWR |= d->mask;
 194                else
 195                        PKWR &= ~d->mask;
 196                return 0;
 197        }
 198
 199        mux_taken = (PWER & d->mux_mask) & (~d->mask);
 200        if (on && mux_taken)
 201                return -EBUSY;
 202
 203        if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
 204                if (on) {
 205                        PWER = (PWER & ~d->mux_mask) | d->mask;
 206
 207                        if (c & MFP_LPM_EDGE_RISE)
 208                                PRER |= d->mask;
 209                        else
 210                                PRER &= ~d->mask;
 211
 212                        if (c & MFP_LPM_EDGE_FALL)
 213                                PFER |= d->mask;
 214                        else
 215                                PFER &= ~d->mask;
 216                } else {
 217                        PWER &= ~d->mask;
 218                        PRER &= ~d->mask;
 219                        PFER &= ~d->mask;
 220                }
 221        }
 222        return 0;
 223}
 224
 225#ifdef CONFIG_PXA25x
 226static void __init pxa25x_mfp_init(void)
 227{
 228        int i;
 229
 230        /* running before pxa_gpio_probe() */
 231#ifdef CONFIG_CPU_PXA26x
 232        pxa_last_gpio = 89;
 233#else
 234        pxa_last_gpio = 84;
 235#endif
 236        for (i = 0; i <= pxa_last_gpio; i++)
 237                gpio_desc[i].valid = 1;
 238
 239        for (i = 0; i <= 15; i++) {
 240                gpio_desc[i].can_wakeup = 1;
 241                gpio_desc[i].mask = GPIO_bit(i);
 242        }
 243
 244        /* PXA26x has additional 4 GPIOs (86/87/88/89) which has the
 245         * direction bit inverted in GPDR2. See PXA26x DM 4.1.1.
 246         */
 247        for (i = 86; i <= pxa_last_gpio; i++)
 248                gpio_desc[i].dir_inverted = 1;
 249}
 250#else
 251static inline void pxa25x_mfp_init(void) {}
 252#endif /* CONFIG_PXA25x */
 253
 254#ifdef CONFIG_PXA27x
 255static int pxa27x_pkwr_gpio[] = {
 256        13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
 257        95, 96, 97, 98, 99, 100, 101, 102
 258};
 259
 260int keypad_set_wake(unsigned int on)
 261{
 262        unsigned int i, gpio, mask = 0;
 263        struct gpio_desc *d;
 264
 265        for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 266
 267                gpio = pxa27x_pkwr_gpio[i];
 268                d = &gpio_desc[gpio];
 269
 270                /* skip if configured as generic GPIO */
 271                if (MFP_AF(d->config) == 0)
 272                        continue;
 273
 274                if (d->config & MFP_LPM_CAN_WAKEUP)
 275                        mask |= gpio_desc[gpio].mask;
 276        }
 277
 278        if (on)
 279                PKWR |= mask;
 280        else
 281                PKWR &= ~mask;
 282        return 0;
 283}
 284
 285#define PWER_WEMUX2_GPIO38      (1 << 16)
 286#define PWER_WEMUX2_GPIO53      (2 << 16)
 287#define PWER_WEMUX2_GPIO40      (3 << 16)
 288#define PWER_WEMUX2_GPIO36      (4 << 16)
 289#define PWER_WEMUX2_MASK        (7 << 16)
 290#define PWER_WEMUX3_GPIO31      (1 << 19)
 291#define PWER_WEMUX3_GPIO113     (2 << 19)
 292#define PWER_WEMUX3_MASK        (3 << 19)
 293
 294#define INIT_GPIO_DESC_MUXED(mux, gpio)                         \
 295do {                                                            \
 296        gpio_desc[(gpio)].can_wakeup = 1;                       \
 297        gpio_desc[(gpio)].mask = PWER_ ## mux ## _GPIO ##gpio;  \
 298        gpio_desc[(gpio)].mux_mask = PWER_ ## mux ## _MASK;     \
 299} while (0)
 300
 301static void __init pxa27x_mfp_init(void)
 302{
 303        int i, gpio;
 304
 305        pxa_last_gpio = 120;    /* running before pxa_gpio_probe() */
 306        for (i = 0; i <= pxa_last_gpio; i++) {
 307                /* skip GPIO2, 5, 6, 7, 8, they are not
 308                 * valid pins allow configuration
 309                 */
 310                if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
 311                        continue;
 312
 313                gpio_desc[i].valid = 1;
 314        }
 315
 316        /* Keypad GPIOs */
 317        for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 318                gpio = pxa27x_pkwr_gpio[i];
 319                gpio_desc[gpio].can_wakeup = 1;
 320                gpio_desc[gpio].keypad_gpio = 1;
 321                gpio_desc[gpio].mask = 1 << i;
 322        }
 323
 324        /* Overwrite GPIO13 as a PWER wakeup source */
 325        for (i = 0; i <= 15; i++) {
 326                /* skip GPIO2, 5, 6, 7, 8 */
 327                if (GPIO_bit(i) & 0x1e4)
 328                        continue;
 329
 330                gpio_desc[i].can_wakeup = 1;
 331                gpio_desc[i].mask = GPIO_bit(i);
 332        }
 333
 334        gpio_desc[35].can_wakeup = 1;
 335        gpio_desc[35].mask = PWER_WE35;
 336
 337        INIT_GPIO_DESC_MUXED(WEMUX3, 31);
 338        INIT_GPIO_DESC_MUXED(WEMUX3, 113);
 339        INIT_GPIO_DESC_MUXED(WEMUX2, 38);
 340        INIT_GPIO_DESC_MUXED(WEMUX2, 53);
 341        INIT_GPIO_DESC_MUXED(WEMUX2, 40);
 342        INIT_GPIO_DESC_MUXED(WEMUX2, 36);
 343}
 344#else
 345static inline void pxa27x_mfp_init(void) {}
 346#endif /* CONFIG_PXA27x */
 347
 348#ifdef CONFIG_PM
 349static unsigned long saved_gafr[2][4];
 350static unsigned long saved_gpdr[4];
 351static unsigned long saved_gplr[4];
 352static unsigned long saved_pgsr[4];
 353
 354static int pxa2xx_mfp_suspend(void)
 355{
 356        int i;
 357
 358        /* set corresponding PGSR bit of those marked MFP_LPM_KEEP_OUTPUT */
 359        for (i = 0; i < pxa_last_gpio; i++) {
 360                if ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
 361                    (GPDR(i) & GPIO_bit(i))) {
 362                        if (GPLR(i) & GPIO_bit(i))
 363                                PGSR(gpio_to_bank(i)) |= GPIO_bit(i);
 364                        else
 365                                PGSR(gpio_to_bank(i)) &= ~GPIO_bit(i);
 366                }
 367        }
 368
 369        for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
 370                saved_gafr[0][i] = GAFR_L(i);
 371                saved_gafr[1][i] = GAFR_U(i);
 372                saved_gpdr[i] = GPDR(i * 32);
 373                saved_gplr[i] = GPLR(i * 32);
 374                saved_pgsr[i] = PGSR(i);
 375
 376                GPSR(i * 32) = PGSR(i);
 377                GPCR(i * 32) = ~PGSR(i);
 378        }
 379
 380        /* set GPDR bits taking into account MFP_LPM_KEEP_OUTPUT */
 381        for (i = 0; i < pxa_last_gpio; i++) {
 382                if ((gpdr_lpm[gpio_to_bank(i)] & GPIO_bit(i)) ||
 383                    ((gpio_desc[i].config & MFP_LPM_KEEP_OUTPUT) &&
 384                     (saved_gpdr[gpio_to_bank(i)] & GPIO_bit(i))))
 385                        GPDR(i) |= GPIO_bit(i);
 386                else
 387                        GPDR(i) &= ~GPIO_bit(i);
 388        }
 389
 390        return 0;
 391}
 392
 393static void pxa2xx_mfp_resume(void)
 394{
 395        int i;
 396
 397        for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++) {
 398                GAFR_L(i) = saved_gafr[0][i];
 399                GAFR_U(i) = saved_gafr[1][i];
 400                GPSR(i * 32) = saved_gplr[i];
 401                GPCR(i * 32) = ~saved_gplr[i];
 402                GPDR(i * 32) = saved_gpdr[i];
 403                PGSR(i) = saved_pgsr[i];
 404        }
 405        PSSR = PSSR_RDH | PSSR_PH;
 406}
 407#else
 408#define pxa2xx_mfp_suspend      NULL
 409#define pxa2xx_mfp_resume       NULL
 410#endif
 411
 412struct syscore_ops pxa2xx_mfp_syscore_ops = {
 413        .suspend        = pxa2xx_mfp_suspend,
 414        .resume         = pxa2xx_mfp_resume,
 415};
 416
 417static int __init pxa2xx_mfp_init(void)
 418{
 419        int i;
 420
 421        if (!cpu_is_pxa2xx())
 422                return 0;
 423
 424        if (cpu_is_pxa25x())
 425                pxa25x_mfp_init();
 426
 427        if (cpu_is_pxa27x())
 428                pxa27x_mfp_init();
 429
 430        /* clear RDH bit to enable GPIO receivers after reset/sleep exit */
 431        PSSR = PSSR_RDH;
 432
 433        /* initialize gafr_run[], pgsr_lpm[] from existing values */
 434        for (i = 0; i <= gpio_to_bank(pxa_last_gpio); i++)
 435                gpdr_lpm[i] = GPDR(i * 32);
 436
 437        return 0;
 438}
 439postcore_initcall(pxa2xx_mfp_init);
 440