target/linux/adm5120/files/arch/mips/adm5120/gpio.c

   1 /*
   2  *  $Id$
   3  *
   4  *  ADM5120 GPIO support
   5  *
   6  *  Copyright (C) 2007 OpenWrt.org
   7  *  Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
   8  *
   9  *  This program is free software; you can redistribute it and/or
  10  *  modify it under the terms of the GNU General Public License
  11  *  as published by the Free Software Foundation; either version 2
  12  *  of the License, or (at your option) any later version.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the
  21  *  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22  *  Boston, MA  02110-1301, USA.
  23  *
  24  */
  25
  26 #include <linux/autoconf.h>
  27 #include <linux/init.h>
  28 #include <linux/types.h>
  29 #include <linux/module.h>
  30 #include <linux/delay.h>
  31 #include <linux/platform_device.h>
  32
  33 #include <asm/addrspace.h>
  34 #include <asm/io.h>
  35 #include <asm/gpio.h>
  36
  37 #include <asm/mach-adm5120/adm5120_defs.h>
  38 #include <asm/mach-adm5120/adm5120_info.h>
  39 #include <asm/mach-adm5120/adm5120_switch.h>
  40
  41 typedef void __iomem *  gpio_reg_t;
  42 #define GPIO_READ(r)    readl((r))
  43 #define GPIO_WRITE(v,r) writel((v),(r))
  44 #define GPIO_REG(r)     (gpio_reg_t)(KSEG1ADDR(ADM5120_SWITCH_BASE)+r)
  45
  46 struct adm5120_gpio_line {
  47         u32 flags;
  48         const char *label;
  49 };
  50
  51 #define GPIO_FLAG_VALID         0x01
  52 #define GPIO_FLAG_USED          0x02
  53
  54 struct led_desc {
  55         gpio_reg_t reg; /* LED register address */
  56         u8 iv_shift;    /* shift amount for input bit */
  57         u8 mode_shift;  /* shift amount for mode bits */
  58 };
  59
  60 #define LED_DESC(_port,_led) { \
  61                 .reg = GPIO_REG(SWITCH_REG_PORT0_LED+_port*4), \
  62                 .iv_shift = LED0_IV_SHIFT+_led, \
  63                 .mode_shift = _led*4 \
  64         }
  65
  66 static struct led_desc led_table[15] = {
  67         LED_DESC(0, 0), LED_DESC(0, 1), LED_DESC(0, 2),
  68         LED_DESC(1, 0), LED_DESC(1, 1), LED_DESC(1, 2),
  69         LED_DESC(2, 0), LED_DESC(2, 1), LED_DESC(2, 2),
  70         LED_DESC(3, 0), LED_DESC(3, 1), LED_DESC(3, 2),
  71         LED_DESC(4, 0), LED_DESC(4, 1), LED_DESC(4, 2)
  72 };
  73
  74 static struct adm5120_gpio_line adm5120_gpio_map[ADM5120_GPIO_COUNT] = {
  75         [ADM5120_GPIO_PIN0] = {.flags = GPIO_FLAG_VALID},
  76         [ADM5120_GPIO_PIN1] = {.flags = GPIO_FLAG_VALID},
  77         [ADM5120_GPIO_PIN2] = {.flags = GPIO_FLAG_VALID},
  78         [ADM5120_GPIO_PIN3] = {.flags = GPIO_FLAG_VALID},
  79         [ADM5120_GPIO_PIN4] = {.flags = GPIO_FLAG_VALID},
  80         [ADM5120_GPIO_PIN5] = {.flags = GPIO_FLAG_VALID},
  81         [ADM5120_GPIO_PIN6] = {.flags = GPIO_FLAG_VALID},
  82         [ADM5120_GPIO_PIN7] = {.flags = GPIO_FLAG_VALID},
  83         [ADM5120_GPIO_P0L0] = {.flags = GPIO_FLAG_VALID},
  84         [ADM5120_GPIO_P0L1] = {.flags = GPIO_FLAG_VALID},
  85         [ADM5120_GPIO_P0L2] = {.flags = GPIO_FLAG_VALID},
  86         [ADM5120_GPIO_P1L0] = {.flags = GPIO_FLAG_VALID},
  87         [ADM5120_GPIO_P1L1] = {.flags = GPIO_FLAG_VALID},
  88         [ADM5120_GPIO_P1L2] = {.flags = GPIO_FLAG_VALID},
  89         [ADM5120_GPIO_P2L0] = {.flags = GPIO_FLAG_VALID},
  90         [ADM5120_GPIO_P2L1] = {.flags = GPIO_FLAG_VALID},
  91         [ADM5120_GPIO_P2L2] = {.flags = GPIO_FLAG_VALID},
  92         [ADM5120_GPIO_P3L0] = {.flags = GPIO_FLAG_VALID},
  93         [ADM5120_GPIO_P3L1] = {.flags = GPIO_FLAG_VALID},
  94         [ADM5120_GPIO_P3L2] = {.flags = GPIO_FLAG_VALID},
  95         [ADM5120_GPIO_P4L0] = {.flags = GPIO_FLAG_VALID},
  96         [ADM5120_GPIO_P4L1] = {.flags = GPIO_FLAG_VALID},
  97         [ADM5120_GPIO_P4L2] = {.flags = GPIO_FLAG_VALID}
  98 };
  99
 100 #define gpio_is_invalid(g) ( \
 101                 (g) > ADM5120_GPIO_MAX || \
 102                 ((adm5120_gpio_map[(g)].flags & GPIO_FLAG_VALID) == 0) \
 103         )
 104
 105 #define gpio_is_used(g) ((adm5120_gpio_map[(g)].flags & GPIO_FLAG_USED) != 0)
 106
 107 /*
 108  * Helpers for GPIO lines in GPIO_CONF0 register
 109  */
 110 #define PIN_IM(p)       ((1 << GPIO_CONF0_IM_SHIFT) << p)
 111 #define PIN_IV(p)       ((1 << GPIO_CONF0_IV_SHIFT) << p)
 112 #define PIN_OE(p)       ((1 << GPIO_CONF0_OE_SHIFT) << p)
 113 #define PIN_OV(p)       ((1 << GPIO_CONF0_OV_SHIFT) << p)
 114
 115 static inline int pins_direction_input(unsigned pin)
 116 {
 117         gpio_reg_t *reg;
 118         u32 t;
 119
 120         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 121
 122         t = GPIO_READ(reg);
 123         t &= ~(PIN_OE(pin));
 124         t |= PIN_IM(pin);
 125         GPIO_WRITE(t,reg);
 126
 127         return 0;
 128 }
 129
 130 static inline int pins_direction_output(unsigned pin, int value)
 131 {
 132         gpio_reg_t *reg;
 133         u32 t;
 134
 135         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 136
 137         t = GPIO_READ(reg);
 138         t &= ~(PIN_IM(pin) | PIN_OV(pin));
 139         t |= PIN_OE(pin);
 140
 141         if (value)
 142                 t |= PIN_OV(pin);
 143
 144         GPIO_WRITE(t,reg);
 145
 146         return 0;
 147 }
 148
 149 static inline int pins_get_value(unsigned pin)
 150 {
 151         gpio_reg_t *reg;
 152         u32 t;
 153
 154         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 155
 156         t = GPIO_READ(reg);
 157         if ((t & PIN_IM(pin)) != 0)
 158                 t &= PIN_IV(pin);
 159         else
 160                 t &= PIN_OV(pin);
 161
 162         return (t) ? 1 : 0;
 163 }
 164
 165 static inline void pins_set_value(unsigned pin, int value)
 166 {
 167         gpio_reg_t *reg;
 168         u32 t;
 169
 170         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 171
 172         t = GPIO_READ(reg);
 173         if (value == 0)
 174                 t &= ~(PIN_OV(pin));
 175         else
 176                 t |= PIN_OV(pin);
 177
 178         GPIO_WRITE(t,reg);
 179 }
 180
 181 /*
 182  * Helpers for GPIO lines in PORTx_LED registers
 183  */
 184 static inline int leds_direction_input(unsigned led)
 185 {
 186         gpio_reg_t *reg;
 187         u32 t;
 188
 189         reg = led_table[led].reg;
 190         t = GPIO_READ(reg);
 191         t &= ~(LED_MODE_MASK << led_table[led].mode_shift);
 192         GPIO_WRITE(t,reg);
 193
 194         return 0;
 195 }
 196
 197 static inline int leds_direction_output(unsigned led, int value)
 198 {
 199         gpio_reg_t *reg;
 200         u32 t, s;
 201
 202         reg = led_table[led].reg;
 203         s = led_table[led].mode_shift;
 204
 205         t = GPIO_READ(reg);
 206         t &= ~(LED_MODE_MASK << s);
 207
 208         switch (value) {
 209         case ADM5120_GPIO_LOW:
 210                 t |= (LED_MODE_OUT_LOW << s);
 211                 break;
 212         case ADM5120_GPIO_FLASH:
 213         case ADM5120_GPIO_LINK:
 214         case ADM5120_GPIO_SPEED:
 215         case ADM5120_GPIO_DUPLEX:
 216         case ADM5120_GPIO_ACT:
 217         case ADM5120_GPIO_COLL:
 218         case ADM5120_GPIO_LINK_ACT:
 219         case ADM5120_GPIO_DUPLEX_COLL:
 220         case ADM5120_GPIO_10M_ACT:
 221         case ADM5120_GPIO_100M_ACT:
 222                 t |= ((value & LED_MODE_MASK) << s);
 223                 break;
 224         default:
 225                 t |= (LED_MODE_OUT_HIGH << s);
 226                 break;
 227         }
 228
 229         GPIO_WRITE(t,reg);
 230
 231         return 0;
 232 }
 233
 234 static inline int leds_get_value(unsigned led)
 235 {
 236         gpio_reg_t *reg;
 237         u32 t, m;
 238
 239         reg = led_table[led].reg;
 240
 241         t = GPIO_READ(reg);
 242         m = (t >> led_table[led].mode_shift) & LED_MODE_MASK;
 243         if (m == LED_MODE_INPUT)
 244                 return (t >> led_table[led].iv_shift) & 1;
 245
 246         if (m == LED_MODE_OUT_LOW)
 247                 return 0;
 248
 249         return 1;
 250 }
 251
 252 /*
 253  * Main GPIO support routines
 254  */
 255 int adm5120_gpio_direction_input(unsigned gpio)
 256 {
 257         if (gpio_is_invalid(gpio))
 258                 return -EINVAL;
 259
 260         if (gpio < ADM5120_GPIO_P0L0)
 261                 return pins_direction_input(gpio);
 262
 263         gpio -= ADM5120_GPIO_P0L0;
 264         return leds_direction_input(gpio);
 265 }
 266
 267 int adm5120_gpio_direction_output(unsigned gpio, int value)
 268 {
 269         if (gpio_is_invalid(gpio))
 270                 return -EINVAL;
 271
 272         if (gpio < ADM5120_GPIO_P0L0)
 273                 return pins_direction_output(gpio, value);
 274
 275         gpio -= ADM5120_GPIO_P0L0;
 276         return leds_direction_output(gpio, value);
 277 }
 278
 279 int adm5120_gpio_get_value(unsigned gpio)
 280 {
 281         if (gpio < ADM5120_GPIO_P0L0)
 282                 return pins_get_value(gpio);
 283
 284         gpio -= ADM5120_GPIO_P0L0;
 285         return leds_get_value(gpio);
 286 }
 287
 288 void adm5120_gpio_set_value(unsigned gpio, int value)
 289 {
 290         if (gpio < ADM5120_GPIO_P0L0) {
 291                 pins_set_value(gpio, value);
 292                 return;
 293         }
 294
 295         gpio -= ADM5120_GPIO_P0L0;
 296         leds_direction_output(gpio, value);
 297 }
 298
 299 int adm5120_gpio_request(unsigned gpio, const char *label)
 300 {
 301         if (gpio_is_invalid(gpio))
 302                 return -EINVAL;
 303
 304         if (gpio_is_used(gpio))
 305                 return -EBUSY;
 306
 307         adm5120_gpio_map[gpio].flags |= GPIO_FLAG_USED;
 308         adm5120_gpio_map[gpio].label = label;
 309
 310         return 0;
 311 }
 312
 313 void adm5120_gpio_free(unsigned gpio)
 314 {
 315         if (gpio_is_invalid(gpio))
 316                 return;
 317
 318         adm5120_gpio_map[gpio].flags &= ~GPIO_FLAG_USED;
 319         adm5120_gpio_map[gpio].label = NULL;
 320 }
 321
 322 int adm5120_gpio_to_irq(unsigned gpio)
 323 {
 324         /* FIXME: not yet implemented */
 325         return -EINVAL;
 326 }
 327
 328 int adm5120_irq_to_gpio(unsigned irq)
 329 {
 330         /* FIXME: not yet implemented */
 331         return -EINVAL;
 332 }
 333
 334 static int __init adm5120_gpio_init(void)
 335 {
 336         int i;
 337
 338         if (adm5120_package_pqfp()) {
 339                 /* GPIO pins 4-7 are unavailable in ADM5120P */
 340                 for (i=ADM5120_GPIO_PIN4; i<=ADM5120_GPIO_PIN7; i++)
 341                         adm5120_gpio_map[i].flags &= ~GPIO_FLAG_VALID;
 342         }
 343
 344         return 0;
 345 }
 346
 347 pure_initcall(adm5120_gpio_init);
 348
 349 EXPORT_SYMBOL(adm5120_gpio_direction_output);
 350 EXPORT_SYMBOL(adm5120_gpio_direction_input);
 351 EXPORT_SYMBOL(adm5120_gpio_get_value);
 352 EXPORT_SYMBOL(adm5120_gpio_set_value);
 353 EXPORT_SYMBOL(adm5120_gpio_request);
 354 EXPORT_SYMBOL(adm5120_gpio_free);
 355 EXPORT_SYMBOL(adm5120_gpio_to_irq);
 356 EXPORT_SYMBOL(adm5120_irq_to_gpio);