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 #include <linux/io.h>
  33
  34 #include <asm/addrspace.h>
  35 #include <asm/gpio.h>
  36
  37 #include <adm5120_defs.h>
  38 #include <adm5120_info.h>
  39 #include <adm5120_switch.h>
  40 #include <adm5120_irq.h>
  41
  42 #define GPIO_READ(r)            readl((r))
  43 #define GPIO_WRITE(v, r)        writel((v), (r))
  44 #define GPIO_REG(r)     (void __iomem *)(KSEG1ADDR(ADM5120_SWITCH_BASE)+r)
  45
  46 struct adm5120_gpio_line {
  47         u32 flags;
  48         const char *label;
  49         int irq;
  50 };
  51
  52 #define GPIO_FLAG_VALID         0x01
  53 #define GPIO_FLAG_USED          0x02
  54
  55 struct led_desc {
  56         void __iomem *reg;      /* LED register address */
  57         u8 iv_shift;            /* shift amount for input bit */
  58         u8 mode_shift;          /* shift amount for mode bits */
  59 };
  60
  61 #define LED_DESC(p, l) { \
  62                 .reg = GPIO_REG(SWITCH_REG_PORT0_LED+((p) * 4)), \
  63                 .iv_shift = LED0_IV_SHIFT + (l), \
  64                 .mode_shift = (l) * 4 \
  65         }
  66
  67 static struct led_desc led_table[15] = {
  68         LED_DESC(0, 0), LED_DESC(0, 1), LED_DESC(0, 2),
  69         LED_DESC(1, 0), LED_DESC(1, 1), LED_DESC(1, 2),
  70         LED_DESC(2, 0), LED_DESC(2, 1), LED_DESC(2, 2),
  71         LED_DESC(3, 0), LED_DESC(3, 1), LED_DESC(3, 2),
  72         LED_DESC(4, 0), LED_DESC(4, 1), LED_DESC(4, 2)
  73 };
  74
  75 static struct adm5120_gpio_line adm5120_gpio_map[ADM5120_GPIO_COUNT];
  76
  77 /*-------------------------------------------------------------------------*/
  78
  79 static inline int gpio_is_invalid(unsigned gpio)
  80 {
  81         if ((gpio > ADM5120_GPIO_MAX) ||
  82                 (adm5120_gpio_map[gpio].flags & GPIO_FLAG_VALID) == 0);
  83                 return 0;
  84
  85         return 1;
  86 }
  87
  88 static inline int gpio_is_used(unsigned gpio)
  89 {
  90         return ((adm5120_gpio_map[gpio].flags & GPIO_FLAG_USED) != 0);
  91 }
  92
  93 /*-------------------------------------------------------------------------*/
  94
  95 /*
  96  * Helpers for GPIO lines in GPIO_CONF0 register
  97  */
  98 #define PIN_IM(p)       ((1 << GPIO_CONF0_IM_SHIFT) << p)
  99 #define PIN_IV(p)       ((1 << GPIO_CONF0_IV_SHIFT) << p)
 100 #define PIN_OE(p)       ((1 << GPIO_CONF0_OE_SHIFT) << p)
 101 #define PIN_OV(p)       ((1 << GPIO_CONF0_OV_SHIFT) << p)
 102
 103 static inline int pins_direction_input(unsigned pin)
 104 {
 105         void __iomem **reg;
 106         u32 t;
 107
 108         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 109
 110         t = GPIO_READ(reg);
 111         t &= ~(PIN_OE(pin));
 112         t |= PIN_IM(pin);
 113         GPIO_WRITE(t, reg);
 114
 115         return 0;
 116 }
 117
 118 static inline int pins_direction_output(unsigned pin, int value)
 119 {
 120         void __iomem **reg;
 121         u32 t;
 122
 123         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 124
 125         t = GPIO_READ(reg);
 126         t &= ~(PIN_IM(pin) | PIN_OV(pin));
 127         t |= PIN_OE(pin);
 128
 129         if (value)
 130                 t |= PIN_OV(pin);
 131
 132         GPIO_WRITE(t, reg);
 133
 134         return 0;
 135 }
 136
 137 static inline int pins_get_value(unsigned pin)
 138 {
 139         void __iomem **reg;
 140         u32 t;
 141
 142         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 143
 144         t = GPIO_READ(reg);
 145         if ((t & PIN_IM(pin)) != 0)
 146                 t &= PIN_IV(pin);
 147         else
 148                 t &= PIN_OV(pin);
 149
 150         return (t) ? 1 : 0;
 151 }
 152
 153 static inline void pins_set_value(unsigned pin, int value)
 154 {
 155         void __iomem **reg;
 156         u32 t;
 157
 158         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 159
 160         t = GPIO_READ(reg);
 161         if (value == 0)
 162                 t &= ~(PIN_OV(pin));
 163         else
 164                 t |= PIN_OV(pin);
 165
 166         GPIO_WRITE(t, reg);
 167 }
 168
 169 /*
 170  * Helpers for GPIO lines in PORTx_LED registers
 171  */
 172 static inline int leds_direction_input(unsigned led)
 173 {
 174         void __iomem **reg;
 175         u32 t;
 176
 177         reg = led_table[led].reg;
 178         t = GPIO_READ(reg);
 179         t &= ~(LED_MODE_MASK << led_table[led].mode_shift);
 180         GPIO_WRITE(t, reg);
 181
 182         return 0;
 183 }
 184
 185 static inline int leds_direction_output(unsigned led, int value)
 186 {
 187         void __iomem **reg;
 188         u32 t, s;
 189
 190         reg = led_table[led].reg;
 191         s = led_table[led].mode_shift;
 192
 193         t = GPIO_READ(reg);
 194         t &= ~(LED_MODE_MASK << s);
 195
 196         switch (value) {
 197         case ADM5120_GPIO_LOW:
 198                 t |= (LED_MODE_OUT_LOW << s);
 199                 break;
 200         case ADM5120_GPIO_FLASH:
 201         case ADM5120_GPIO_LINK:
 202         case ADM5120_GPIO_SPEED:
 203         case ADM5120_GPIO_DUPLEX:
 204         case ADM5120_GPIO_ACT:
 205         case ADM5120_GPIO_COLL:
 206         case ADM5120_GPIO_LINK_ACT:
 207         case ADM5120_GPIO_DUPLEX_COLL:
 208         case ADM5120_GPIO_10M_ACT:
 209         case ADM5120_GPIO_100M_ACT:
 210                 t |= ((value & LED_MODE_MASK) << s);
 211                 break;
 212         default:
 213                 t |= (LED_MODE_OUT_HIGH << s);
 214                 break;
 215         }
 216
 217         GPIO_WRITE(t, reg);
 218
 219         return 0;
 220 }
 221
 222 static inline int leds_get_value(unsigned led)
 223 {
 224         void __iomem **reg;
 225         u32 t, m;
 226
 227         reg = led_table[led].reg;
 228
 229         t = GPIO_READ(reg);
 230         m = (t >> led_table[led].mode_shift) & LED_MODE_MASK;
 231         if (m == LED_MODE_INPUT)
 232                 return (t >> led_table[led].iv_shift) & 1;
 233
 234         if (m == LED_MODE_OUT_LOW)
 235                 return 0;
 236
 237         return 1;
 238 }
 239
 240 /*-------------------------------------------------------------------------*/
 241
 242 /*
 243  * Main GPIO support routines
 244  */
 245 int adm5120_gpio_direction_input(unsigned gpio)
 246 {
 247         if (gpio_is_invalid(gpio))
 248                 return -EINVAL;
 249
 250         if (gpio < ADM5120_GPIO_P0L0)
 251                 return pins_direction_input(gpio);
 252
 253         gpio -= ADM5120_GPIO_P0L0;
 254         return leds_direction_input(gpio);
 255 }
 256 EXPORT_SYMBOL(adm5120_gpio_direction_input);
 257
 258 int adm5120_gpio_direction_output(unsigned gpio, int value)
 259 {
 260         if (gpio_is_invalid(gpio))
 261                 return -EINVAL;
 262
 263         if (gpio < ADM5120_GPIO_P0L0)
 264                 return pins_direction_output(gpio, value);
 265
 266         gpio -= ADM5120_GPIO_P0L0;
 267         return leds_direction_output(gpio, value);
 268 }
 269 EXPORT_SYMBOL(adm5120_gpio_direction_output);
 270
 271 int adm5120_gpio_get_value(unsigned gpio)
 272 {
 273         if (gpio < ADM5120_GPIO_P0L0)
 274                 return pins_get_value(gpio);
 275
 276         gpio -= ADM5120_GPIO_P0L0;
 277         return leds_get_value(gpio);
 278 }
 279 EXPORT_SYMBOL(adm5120_gpio_get_value);
 280
 281 void adm5120_gpio_set_value(unsigned gpio, int value)
 282 {
 283         if (gpio < ADM5120_GPIO_P0L0) {
 284                 pins_set_value(gpio, value);
 285                 return;
 286         }
 287
 288         gpio -= ADM5120_GPIO_P0L0;
 289         leds_direction_output(gpio, value);
 290 }
 291 EXPORT_SYMBOL(adm5120_gpio_set_value);
 292
 293 int adm5120_gpio_request(unsigned gpio, const char *label)
 294 {
 295         if (gpio_is_invalid(gpio))
 296                 return -EINVAL;
 297
 298         if (gpio_is_used(gpio))
 299                 return -EBUSY;
 300
 301         adm5120_gpio_map[gpio].flags |= GPIO_FLAG_USED;
 302         adm5120_gpio_map[gpio].label = label;
 303
 304         return 0;
 305 }
 306 EXPORT_SYMBOL(adm5120_gpio_request);
 307
 308 void adm5120_gpio_free(unsigned gpio)
 309 {
 310         if (gpio_is_invalid(gpio))
 311                 return;
 312
 313         adm5120_gpio_map[gpio].flags &= ~GPIO_FLAG_USED;
 314         adm5120_gpio_map[gpio].label = NULL;
 315 }
 316 EXPORT_SYMBOL(adm5120_gpio_free);
 317
 318 int adm5120_gpio_to_irq(unsigned gpio)
 319 {
 320         if (gpio > ADM5120_GPIO_MAX)
 321                 return -EINVAL;
 322
 323         return adm5120_gpio_map[gpio].irq;
 324 }
 325 EXPORT_SYMBOL(adm5120_gpio_to_irq);
 326
 327 int adm5120_irq_to_gpio(unsigned irq)
 328 {
 329         int i;
 330
 331         for (i = 0; i < ADM5120_GPIO_COUNT; i++)
 332                 if (adm5120_gpio_map[i].irq == irq)
 333                         return i;
 334
 335         return -EINVAL;
 336 }
 337 EXPORT_SYMBOL(adm5120_irq_to_gpio);
 338
 339 /*-------------------------------------------------------------------------*/
 340
 341 void __init adm5120_gpio_csx0_enable(void)
 342 {
 343         u32 t;
 344
 345         t = SW_READ_REG(GPIO_CONF2);
 346         t |= GPIO_CONF2_CSX0;
 347         SW_WRITE_REG(GPIO_CONF2, t);
 348
 349         adm5120_gpio_map[ADM5120_GPIO_PIN1].flags &= ~GPIO_FLAG_VALID;
 350         adm5120_gpio_map[ADM5120_GPIO_PIN2].irq = ADM5120_IRQ_GPIO2;
 351 }
 352
 353 void __init adm5120_gpio_csx1_enable(void)
 354 {
 355         u32 t;
 356
 357         t = SW_READ_REG(GPIO_CONF2);
 358         t |= GPIO_CONF2_CSX1;
 359         SW_WRITE_REG(GPIO_CONF2, t);
 360
 361         adm5120_gpio_map[ADM5120_GPIO_PIN3].flags &= ~GPIO_FLAG_VALID;
 362         if (adm5120_package_bga())
 363                 adm5120_gpio_map[ADM5120_GPIO_PIN4].irq = ADM5120_IRQ_GPIO4;
 364 }
 365
 366 void __init adm5120_gpio_ew_enable(void)
 367 {
 368         u32 t;
 369
 370         t = SW_READ_REG(GPIO_CONF2);
 371         t |= GPIO_CONF2_EW;
 372         SW_WRITE_REG(GPIO_CONF2, t);
 373
 374         adm5120_gpio_map[ADM5120_GPIO_PIN0].flags &= ~GPIO_FLAG_VALID;
 375 }
 376
 377 void __init adm5120_gpio_init(void)
 378 {
 379         int i;
 380
 381         SW_WRITE_REG(GPIO_CONF2, 0);
 382
 383         for (i = 0; i < ADM5120_GPIO_COUNT; i++)
 384                 adm5120_gpio_map[i].flags = GPIO_FLAG_VALID;
 385
 386         if (adm5120_package_pqfp()) {
 387                 adm5120_gpio_map[ADM5120_GPIO_PIN4].flags &= ~GPIO_FLAG_VALID;
 388                 adm5120_gpio_map[ADM5120_GPIO_PIN5].flags &= ~GPIO_FLAG_VALID;
 389                 adm5120_gpio_map[ADM5120_GPIO_PIN6].flags &= ~GPIO_FLAG_VALID;
 390                 adm5120_gpio_map[ADM5120_GPIO_PIN7].flags &= ~GPIO_FLAG_VALID;
 391         }
 392 }