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
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <linux/init.h>
  19 #include <linux/sysdev.h>
  20
  21 #include <mach/hardware.h>
  22 #include <mach/pxa-regs.h>
  23 #include <mach/pxa2xx-regs.h>
  24 #include <mach/mfp-pxa2xx.h>
  25
  26 #include "generic.h"
  27
  28 #define gpio_to_bank(gpio)      ((gpio) >> 5)
  29
  30 #define PGSR(x)         __REG2(0x40F00020, (x) << 2)
  31 #define __GAFR(u, x)    __REG2((u) ? 0x40E00058 : 0x40E00054, (x) << 3)
  32 #define GAFR_L(x)       __GAFR(0, x)
  33 #define GAFR_U(x)       __GAFR(1, x)
  34
  35 #define PWER_WE35       (1 << 24)
  36
  37 struct gpio_desc {
  38         unsigned        valid           : 1;
  39         unsigned        can_wakeup      : 1;
  40         unsigned        keypad_gpio     : 1;
  41         unsigned int    mask; /* bit mask in PWER or PKWR */
  42         unsigned long   config;
  43 };
  44
  45 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
  46 static int gpio_nr;
  47
  48 static unsigned long gpdr_lpm[4];
  49
  50 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
  51 {
  52         unsigned long gafr, mask = GPIO_bit(gpio);
  53         int bank = gpio_to_bank(gpio);
  54         int uorl = !!(gpio & 0x10); /* GAFRx_U or GAFRx_L ? */
  55         int shft = (gpio & 0xf) << 1;
  56         int fn = MFP_AF(c);
  57         int dir = c & MFP_DIR_OUT;
  58
  59         if (fn > 3)
  60                 return -EINVAL;
  61
  62         /* alternate function and direction at run-time */
  63         gafr = (uorl == 0) ? GAFR_L(bank) : GAFR_U(bank);
  64         gafr = (gafr & ~(0x3 << shft)) | (fn << shft);
  65
  66         if (uorl == 0)
  67                 GAFR_L(bank) = gafr;
  68         else
  69                 GAFR_U(bank) = gafr;
  70
  71         if (dir == MFP_DIR_OUT)
  72                 GPDR(gpio) |= mask;
  73         else
  74                 GPDR(gpio) &= ~mask;
  75
  76         /* alternate function and direction at low power mode */
  77         switch (c & MFP_LPM_STATE_MASK) {
  78         case MFP_LPM_DRIVE_HIGH:
  79                 PGSR(bank) |= mask;
  80                 dir = MFP_DIR_OUT;
  81                 break;
  82         case MFP_LPM_DRIVE_LOW:
  83                 PGSR(bank) &= ~mask;
  84                 dir = MFP_DIR_OUT;
  85                 break;
  86         case MFP_LPM_DEFAULT:
  87                 break;
  88         default:
  89                 /* warning and fall through, treat as MFP_LPM_DEFAULT */
  90                 pr_warning("%s: GPIO%d: unsupported low power mode\n",
  91                                 __func__, gpio);
  92                 break;
  93         }
  94
  95         if (dir == MFP_DIR_OUT)
  96                 gpdr_lpm[bank] |= mask;
  97         else
  98                 gpdr_lpm[bank] &= ~mask;
  99
 100         /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
 101          * configurations of those pins not able to wakeup
 102          */
 103         if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
 104                 pr_warning("%s: GPIO%d unable to wakeup\n",
 105                                 __func__, gpio);
 106                 return -EINVAL;
 107         }
 108
 109         if ((c & MFP_LPM_CAN_WAKEUP) && (dir == MFP_DIR_OUT)) {
 110                 pr_warning("%s: output GPIO%d unable to wakeup\n",
 111                                 __func__, gpio);
 112                 return -EINVAL;
 113         }
 114
 115         return 0;
 116 }
 117
 118 static inline int __mfp_validate(int mfp)
 119 {
 120         int gpio = mfp_to_gpio(mfp);
 121
 122         if ((mfp > MFP_PIN_GPIO127) || !gpio_desc[gpio].valid) {
 123                 pr_warning("%s: GPIO%d is invalid pin\n", __func__, gpio);
 124                 return -1;
 125         }
 126
 127         return gpio;
 128 }
 129
 130 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
 131 {
 132         unsigned long flags;
 133         unsigned long *c;
 134         int i, gpio;
 135
 136         for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
 137
 138                 gpio = __mfp_validate(MFP_PIN(*c));
 139                 if (gpio < 0)
 140                         continue;
 141
 142                 local_irq_save(flags);
 143
 144                 gpio_desc[gpio].config = *c;
 145                 __mfp_config_gpio(gpio, *c);
 146
 147                 local_irq_restore(flags);
 148         }
 149 }
 150
 151 void pxa2xx_mfp_set_lpm(int mfp, unsigned long lpm)
 152 {
 153         unsigned long flags, c;
 154         int gpio;
 155
 156         gpio = __mfp_validate(mfp);
 157         if (gpio < 0)
 158                 return;
 159
 160         local_irq_save(flags);
 161
 162         c = gpio_desc[gpio].config;
 163         c = (c & ~MFP_LPM_STATE_MASK) | lpm;
 164         __mfp_config_gpio(gpio, c);
 165
 166         local_irq_restore(flags);
 167 }
 168
 169 int gpio_set_wake(unsigned int gpio, unsigned int on)
 170 {
 171         struct gpio_desc *d;
 172         unsigned long c;
 173
 174         if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
 175                 return -EINVAL;
 176
 177         d = &gpio_desc[gpio];
 178         c = d->config;
 179
 180         if (!d->valid)
 181                 return -EINVAL;
 182
 183         if (d->keypad_gpio)
 184                 return -EINVAL;
 185
 186         if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
 187                 if (on) {
 188                         PWER |= d->mask;
 189
 190                         if (c & MFP_LPM_EDGE_RISE)
 191                                 PRER |= d->mask;
 192                         else
 193                                 PRER &= ~d->mask;
 194
 195                         if (c & MFP_LPM_EDGE_FALL)
 196                                 PFER |= d->mask;
 197                         else
 198                                 PFER &= ~d->mask;
 199                 } else {
 200                         PWER &= ~d->mask;
 201                         PRER &= ~d->mask;
 202                         PFER &= ~d->mask;
 203                 }
 204         }
 205         return 0;
 206 }
 207
 208 #ifdef CONFIG_PXA25x
 209 static void __init pxa25x_mfp_init(void)
 210 {
 211         int i;
 212
 213         for (i = 0; i <= 84; i++)
 214                 gpio_desc[i].valid = 1;
 215
 216         for (i = 0; i <= 15; i++) {
 217                 gpio_desc[i].can_wakeup = 1;
 218                 gpio_desc[i].mask = GPIO_bit(i);
 219         }
 220
 221         gpio_nr = 85;
 222 }
 223 #else
 224 static inline void pxa25x_mfp_init(void) {}
 225 #endif /* CONFIG_PXA25x */
 226
 227 #ifdef CONFIG_PXA27x
 228 static int pxa27x_pkwr_gpio[] = {
 229         13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
 230         95, 96, 97, 98, 99, 100, 101, 102
 231 };
 232
 233 int keypad_set_wake(unsigned int on)
 234 {
 235         unsigned int i, gpio, mask = 0;
 236
 237         if (!on) {
 238                 PKWR = 0;
 239                 return 0;
 240         }
 241
 242         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 243
 244                 gpio = pxa27x_pkwr_gpio[i];
 245
 246                 if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP)
 247                         mask |= gpio_desc[gpio].mask;
 248         }
 249
 250         PKWR = mask;
 251         return 0;
 252 }
 253
 254 static void __init pxa27x_mfp_init(void)
 255 {
 256         int i, gpio;
 257
 258         for (i = 0; i <= 120; i++) {
 259                 /* skip GPIO2, 5, 6, 7, 8, they are not
 260                  * valid pins allow configuration
 261                  */
 262                 if (i == 2 || i == 5 || i == 6 || i == 7 || i == 8)
 263                         continue;
 264
 265                 gpio_desc[i].valid = 1;
 266         }
 267
 268         /* Keypad GPIOs */
 269         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 270                 gpio = pxa27x_pkwr_gpio[i];
 271                 gpio_desc[gpio].can_wakeup = 1;
 272                 gpio_desc[gpio].keypad_gpio = 1;
 273                 gpio_desc[gpio].mask = 1 << i;
 274         }
 275
 276         /* Overwrite GPIO13 as a PWER wakeup source */
 277         for (i = 0; i <= 15; i++) {
 278                 /* skip GPIO2, 5, 6, 7, 8 */
 279                 if (GPIO_bit(i) & 0x1e4)
 280                         continue;
 281
 282                 gpio_desc[i].can_wakeup = 1;
 283                 gpio_desc[i].mask = GPIO_bit(i);
 284         }
 285
 286         gpio_desc[35].can_wakeup = 1;
 287         gpio_desc[35].mask = PWER_WE35;
 288
 289         gpio_nr = 121;
 290 }
 291 #else
 292 static inline void pxa27x_mfp_init(void) {}
 293 #endif /* CONFIG_PXA27x */
 294
 295 #ifdef CONFIG_PM
 296 static unsigned long saved_gafr[2][4];
 297 static unsigned long saved_gpdr[4];
 298
 299 static int pxa2xx_mfp_suspend(struct sys_device *d, pm_message_t state)
 300 {
 301         int i;
 302
 303         for (i = 0; i <= gpio_to_bank(gpio_nr); i++) {
 304
 305                 saved_gafr[0][i] = GAFR_L(i);
 306                 saved_gafr[1][i] = GAFR_U(i);
 307                 saved_gpdr[i] = GPDR(i * 32);
 308
 309                 GPDR(i * 32) = gpdr_lpm[i];
 310         }
 311         return 0;
 312 }
 313
 314 static int pxa2xx_mfp_resume(struct sys_device *d)
 315 {
 316         int i;
 317
 318         for (i = 0; i <= gpio_to_bank(gpio_nr); i++) {
 319                 GAFR_L(i) = saved_gafr[0][i];
 320                 GAFR_U(i) = saved_gafr[1][i];
 321                 GPDR(i * 32) = saved_gpdr[i];
 322         }
 323         PSSR = PSSR_RDH | PSSR_PH;
 324         return 0;
 325 }
 326 #else
 327 #define pxa2xx_mfp_suspend      NULL
 328 #define pxa2xx_mfp_resume       NULL
 329 #endif
 330
 331 struct sysdev_class pxa2xx_mfp_sysclass = {
 332         .name           = "mfp",
 333         .suspend        = pxa2xx_mfp_suspend,
 334         .resume         = pxa2xx_mfp_resume,
 335 };
 336
 337 static int __init pxa2xx_mfp_init(void)
 338 {
 339         int i;
 340
 341         if (!cpu_is_pxa2xx())
 342                 return 0;
 343
 344         if (cpu_is_pxa25x())
 345                 pxa25x_mfp_init();
 346
 347         if (cpu_is_pxa27x())
 348                 pxa27x_mfp_init();
 349
 350         /* initialize gafr_run[], pgsr_lpm[] from existing values */
 351         for (i = 0; i <= gpio_to_bank(gpio_nr); i++)
 352                 gpdr_lpm[i] = GPDR(i * 32);
 353
 354         return sysdev_class_register(&pxa2xx_mfp_sysclass);
 355 }
 356 postcore_initcall(pxa2xx_mfp_init);