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 <asm/arch/hardware.h>
  22 #include <asm/arch/pxa-regs.h>
  23 #include <asm/arch/mfp-pxa2xx.h>
  24
  25 #include "generic.h"
  26
  27 #define PGSR(x)         __REG2(0x40F00020, ((x) & 0x60) >> 3)
  28
  29 #define PWER_WE35       (1 << 24)
  30
  31 struct gpio_desc {
  32         unsigned        valid           : 1;
  33         unsigned        can_wakeup      : 1;
  34         unsigned        keypad_gpio     : 1;
  35         unsigned int    mask; /* bit mask in PWER or PKWR */
  36         unsigned long   config;
  37 };
  38
  39 static struct gpio_desc gpio_desc[MFP_PIN_GPIO127 + 1];
  40
  41 static int __mfp_config_gpio(unsigned gpio, unsigned long c)
  42 {
  43         unsigned long gafr, mask = GPIO_bit(gpio);
  44         int fn;
  45
  46         fn = MFP_AF(c);
  47         if (fn > 3)
  48                 return -EINVAL;
  49
  50         /* alternate function and direction */
  51         gafr = GAFR(gpio) & ~(0x3 << ((gpio & 0xf) * 2));
  52         GAFR(gpio) = gafr |  (fn  << ((gpio & 0xf) * 2));
  53
  54         if (c & MFP_DIR_OUT)
  55                 GPDR(gpio) |= mask;
  56         else
  57                 GPDR(gpio) &= ~mask;
  58
  59         /* low power state */
  60         switch (c & MFP_LPM_STATE_MASK) {
  61         case MFP_LPM_DRIVE_HIGH:
  62                 PGSR(gpio) |= mask;
  63                 break;
  64         case MFP_LPM_DRIVE_LOW:
  65                 PGSR(gpio) &= ~mask;
  66                 break;
  67         case MFP_LPM_INPUT:
  68                 break;
  69         default:
  70                 pr_warning("%s: invalid low power state for GPIO%d\n",
  71                                 __func__, gpio);
  72                 return -EINVAL;
  73         }
  74
  75         /* give early warning if MFP_LPM_CAN_WAKEUP is set on the
  76          * configurations of those pins not able to wakeup
  77          */
  78         if ((c & MFP_LPM_CAN_WAKEUP) && !gpio_desc[gpio].can_wakeup) {
  79                 pr_warning("%s: GPIO%d unable to wakeup\n",
  80                                 __func__, gpio);
  81                 return -EINVAL;
  82         }
  83
  84         if ((c & MFP_LPM_CAN_WAKEUP) && (c & MFP_DIR_OUT)) {
  85                 pr_warning("%s: output GPIO%d unable to wakeup\n",
  86                                 __func__, gpio);
  87                 return -EINVAL;
  88         }
  89
  90         return 0;
  91 }
  92
  93 void pxa2xx_mfp_config(unsigned long *mfp_cfgs, int num)
  94 {
  95         unsigned long flags;
  96         unsigned long *c;
  97         int i, gpio;
  98
  99         for (i = 0, c = mfp_cfgs; i < num; i++, c++) {
 100
 101                 gpio = mfp_to_gpio(MFP_PIN(*c));
 102
 103                 if (!gpio_desc[gpio].valid) {
 104                         pr_warning("%s: GPIO%d is invalid pin\n",
 105                                 __func__, gpio);
 106                         continue;
 107                 }
 108
 109                 local_irq_save(flags);
 110
 111                 gpio_desc[gpio].config = *c;
 112                 __mfp_config_gpio(gpio, *c);
 113
 114                 local_irq_restore(flags);
 115         }
 116 }
 117
 118 int gpio_set_wake(unsigned int gpio, unsigned int on)
 119 {
 120         struct gpio_desc *d;
 121         unsigned long c;
 122
 123         if (gpio > mfp_to_gpio(MFP_PIN_GPIO127))
 124                 return -EINVAL;
 125
 126         d = &gpio_desc[gpio];
 127         c = d->config;
 128
 129         if (!d->valid)
 130                 return -EINVAL;
 131
 132         if (d->keypad_gpio)
 133                 return -EINVAL;
 134
 135         if (d->can_wakeup && (c & MFP_LPM_CAN_WAKEUP)) {
 136                 if (on) {
 137                         PWER |= d->mask;
 138
 139                         if (c & MFP_LPM_EDGE_RISE)
 140                                 PRER |= d->mask;
 141                         else
 142                                 PRER &= ~d->mask;
 143
 144                         if (c & MFP_LPM_EDGE_FALL)
 145                                 PFER |= d->mask;
 146                         else
 147                                 PFER &= ~d->mask;
 148                 } else {
 149                         PWER &= ~d->mask;
 150                         PRER &= ~d->mask;
 151                         PFER &= ~d->mask;
 152                 }
 153         }
 154         return 0;
 155 }
 156
 157 #ifdef CONFIG_PXA25x
 158 static int __init pxa25x_mfp_init(void)
 159 {
 160         int i;
 161
 162         if (cpu_is_pxa25x()) {
 163                 for (i = 0; i <= 84; i++)
 164                         gpio_desc[i].valid = 1;
 165
 166                 for (i = 0; i <= 15; i++) {
 167                         gpio_desc[i].can_wakeup = 1;
 168                         gpio_desc[i].mask = GPIO_bit(i);
 169                 }
 170         }
 171
 172         return 0;
 173 }
 174 postcore_initcall(pxa25x_mfp_init);
 175 #endif /* CONFIG_PXA25x */
 176
 177 #ifdef CONFIG_PXA27x
 178 static int pxa27x_pkwr_gpio[] = {
 179         13, 16, 17, 34, 36, 37, 38, 39, 90, 91, 93, 94,
 180         95, 96, 97, 98, 99, 100, 101, 102
 181 };
 182
 183 int keypad_set_wake(unsigned int on)
 184 {
 185         unsigned int i, gpio, mask = 0;
 186
 187         if (!on) {
 188                 PKWR = 0;
 189                 return 0;
 190         }
 191
 192         for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 193
 194                 gpio = pxa27x_pkwr_gpio[i];
 195
 196                 if (gpio_desc[gpio].config & MFP_LPM_CAN_WAKEUP)
 197                         mask |= gpio_desc[gpio].mask;
 198         }
 199
 200         PKWR = mask;
 201         return 0;
 202 }
 203
 204 static int __init pxa27x_mfp_init(void)
 205 {
 206         int i, gpio;
 207
 208         if (cpu_is_pxa27x()) {
 209                 for (i = 0; i <= 120; i++) {
 210                         /* skip GPIO2, 5, 6, 7, 8, they are not
 211                          * valid pins allow configuration
 212                          */
 213                         if (i == 2 || i == 5 || i == 6 ||
 214                             i == 7 || i == 8)
 215                                 continue;
 216
 217                         gpio_desc[i].valid = 1;
 218                 }
 219
 220                 /* Keypad GPIOs */
 221                 for (i = 0; i < ARRAY_SIZE(pxa27x_pkwr_gpio); i++) {
 222                         gpio = pxa27x_pkwr_gpio[i];
 223                         gpio_desc[gpio].can_wakeup = 1;
 224                         gpio_desc[gpio].keypad_gpio = 1;
 225                         gpio_desc[gpio].mask = 1 << i;
 226                 }
 227
 228                 /* Overwrite GPIO13 as a PWER wakeup source */
 229                 for (i = 0; i <= 15; i++) {
 230                         /* skip GPIO2, 5, 6, 7, 8 */
 231                         if (GPIO_bit(i) & 0x1e4)
 232                                 continue;
 233
 234                         gpio_desc[i].can_wakeup = 1;
 235                         gpio_desc[i].mask = GPIO_bit(i);
 236                 }
 237
 238                 gpio_desc[35].can_wakeup = 1;
 239                 gpio_desc[35].mask = PWER_WE35;
 240         }
 241
 242         return 0;
 243 }
 244 postcore_initcall(pxa27x_mfp_init);
 245 #endif /* CONFIG_PXA27x */