target/linux/adm5120-2.6/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@freemail.hu>
   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         if (value)
 208                 t |= (LED_MODE_OUT_HIGH << s);
 209         else
 210                 t |= (LED_MODE_OUT_LOW << s);
 211
 212         GPIO_WRITE(t,reg);
 213
 214         return 0;
 215 }
 216
 217 static inline int leds_get_value(unsigned led)
 218 {
 219         gpio_reg_t *reg;
 220         u32 t, m;
 221
 222         reg = led_table[led].reg;
 223
 224         t = GPIO_READ(reg);
 225         m = (t >> led_table[led].mode_shift) & LED_MODE_MASK;
 226         if (m == LED_MODE_INPUT)
 227                 return (t >> led_table[led].iv_shift) & 1;
 228
 229         if (m == LED_MODE_OUT_LOW)
 230                 return 0;
 231
 232         return 1;
 233 }
 234
 235 static inline void leds_set_value(unsigned led, int value)
 236 {
 237         gpio_reg_t *reg;
 238         u32 s,t;
 239
 240         reg = led_table[led].reg;
 241         s = led_table[led].mode_shift;
 242
 243         t = GPIO_READ(reg);
 244         t &= ~(LED_MODE_MASK << s);
 245         if (value)
 246                 t |= (LED_MODE_OUT_HIGH << s);
 247         else
 248                 t |= (LED_MODE_OUT_LOW << s);
 249
 250         GPIO_WRITE(t,reg);
 251 }
 252
 253 /*
 254  * Main GPIO support routines
 255  */
 256 int adm5120_gpio_direction_input(unsigned gpio)
 257 {
 258         if (gpio_is_invalid(gpio))
 259                 return -EINVAL;
 260
 261         if (gpio < ADM5120_GPIO_P0L0)
 262                 return pins_direction_input(gpio);
 263
 264         gpio -= ADM5120_GPIO_P0L0;
 265         return leds_direction_input(gpio);
 266 }
 267
 268 int adm5120_gpio_direction_output(unsigned gpio, int value)
 269 {
 270         if (gpio_is_invalid(gpio))
 271                 return -EINVAL;
 272
 273         if (gpio < ADM5120_GPIO_P0L0)
 274                 return pins_direction_output(gpio, value);
 275
 276         gpio -= ADM5120_GPIO_P0L0;
 277         return leds_direction_output(gpio, value);
 278 }
 279
 280 int adm5120_gpio_get_value(unsigned gpio)
 281 {
 282         if (gpio < ADM5120_GPIO_P0L0)
 283                 return pins_get_value(gpio);
 284
 285         gpio -= ADM5120_GPIO_P0L0;
 286         return leds_get_value(gpio);
 287 }
 288
 289 void adm5120_gpio_set_value(unsigned gpio, int value)
 290 {
 291         if (gpio < ADM5120_GPIO_P0L0) {
 292                 pins_set_value(gpio, value);
 293                 return;
 294         }
 295
 296         gpio -= ADM5120_GPIO_P0L0;
 297         leds_set_value(gpio, value);
 298 }
 299
 300 int adm5120_gpio_request(unsigned gpio, const char *label)
 301 {
 302         if (gpio_is_invalid(gpio))
 303                 return -EINVAL;
 304
 305         if (gpio_is_used(gpio))
 306                 return -EBUSY;
 307
 308         adm5120_gpio_map[gpio].flags |= GPIO_FLAG_USED;
 309         adm5120_gpio_map[gpio].label = label;
 310
 311         return 0;
 312 }
 313
 314 void adm5120_gpio_free(unsigned gpio)
 315 {
 316         if (gpio_is_invalid(gpio))
 317                 return;
 318
 319         adm5120_gpio_map[gpio].flags &= ~GPIO_FLAG_USED;
 320         adm5120_gpio_map[gpio].label = NULL;
 321 }
 322
 323 int adm5120_gpio_to_irq(unsigned gpio)
 324 {
 325         /* FIXME: not yet implemented */
 326         return -EINVAL;
 327 }
 328
 329 int adm5120_irq_to_gpio(unsigned irq)
 330 {
 331         /* FIXME: not yet implemented */
 332         return -EINVAL;
 333 }
 334
 335 static int __init adm5120_gpio_init(void)
 336 {
 337         int i;
 338
 339         if (adm5120_package_pqfp()) {
 340                 /* GPIO pins 4-7 are unavailable in ADM5120P */
 341                 for (i=ADM5120_GPIO_PIN4; i<=ADM5120_GPIO_PIN7; i++)
 342                         adm5120_gpio_map[i].flags &= ~GPIO_FLAG_VALID;
 343         }
 344
 345         return 0;
 346 }
 347
 348 subsys_initcall(adm5120_gpio_init);
 349
 350 EXPORT_SYMBOL(adm5120_gpio_direction_output);
 351 EXPORT_SYMBOL(adm5120_gpio_direction_input);
 352 EXPORT_SYMBOL(adm5120_gpio_get_value);
 353 EXPORT_SYMBOL(adm5120_gpio_set_value);
 354 EXPORT_SYMBOL(adm5120_gpio_request);
 355 EXPORT_SYMBOL(adm5120_gpio_free);
 356 EXPORT_SYMBOL(adm5120_gpio_to_irq);
 357 EXPORT_SYMBOL(adm5120_irq_to_gpio);