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 static u32 gpio_conf2;
  78
  79 /*-------------------------------------------------------------------------*/
  80
  81 static inline int gpio_is_invalid(unsigned gpio)
  82 {
  83         if ((gpio > ADM5120_GPIO_MAX) ||
  84                 (adm5120_gpio_map[gpio].flags & GPIO_FLAG_VALID) == 0);
  85                 return 0;
  86
  87         return 1;
  88 }
  89
  90 static inline int gpio_is_used(unsigned gpio)
  91 {
  92         return ((adm5120_gpio_map[gpio].flags & GPIO_FLAG_USED) != 0);
  93 }
  94
  95 /*-------------------------------------------------------------------------*/
  96
  97 /*
  98  * Helpers for GPIO lines in GPIO_CONF0 register
  99  */
 100 #define PIN_IM(p)       ((1 << GPIO_CONF0_IM_SHIFT) << p)
 101 #define PIN_IV(p)       ((1 << GPIO_CONF0_IV_SHIFT) << p)
 102 #define PIN_OE(p)       ((1 << GPIO_CONF0_OE_SHIFT) << p)
 103 #define PIN_OV(p)       ((1 << GPIO_CONF0_OV_SHIFT) << p)
 104
 105 static inline int pins_direction_input(unsigned pin)
 106 {
 107         void __iomem **reg;
 108         u32 t;
 109
 110         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 111
 112         t = GPIO_READ(reg);
 113         t &= ~(PIN_OE(pin));
 114         t |= PIN_IM(pin);
 115         GPIO_WRITE(t, reg);
 116
 117         return 0;
 118 }
 119
 120 static inline int pins_direction_output(unsigned pin, int value)
 121 {
 122         void __iomem **reg;
 123         u32 t;
 124
 125         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 126
 127         t = GPIO_READ(reg);
 128         t &= ~(PIN_IM(pin) | PIN_OV(pin));
 129         t |= PIN_OE(pin);
 130
 131         if (value)
 132                 t |= PIN_OV(pin);
 133
 134         GPIO_WRITE(t, reg);
 135
 136         return 0;
 137 }
 138
 139 static inline int pins_get_value(unsigned pin)
 140 {
 141         void __iomem **reg;
 142         u32 t;
 143
 144         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 145
 146         t = GPIO_READ(reg);
 147         if ((t & PIN_IM(pin)) != 0)
 148                 t &= PIN_IV(pin);
 149         else
 150                 t &= PIN_OV(pin);
 151
 152         return (t) ? 1 : 0;
 153 }
 154
 155 static inline void pins_set_value(unsigned pin, int value)
 156 {
 157         void __iomem **reg;
 158         u32 t;
 159
 160         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 161
 162         t = GPIO_READ(reg);
 163         if (value == 0)
 164                 t &= ~(PIN_OV(pin));
 165         else
 166                 t |= PIN_OV(pin);
 167
 168         GPIO_WRITE(t, reg);
 169 }
 170
 171 /*
 172  * Helpers for GPIO lines in PORTx_LED registers
 173  */
 174 static inline int leds_direction_input(unsigned led)
 175 {
 176         void __iomem **reg;
 177         u32 t;
 178
 179         reg = led_table[led].reg;
 180         t = GPIO_READ(reg);
 181         t &= ~(LED_MODE_MASK << led_table[led].mode_shift);
 182         GPIO_WRITE(t, reg);
 183
 184         return 0;
 185 }
 186
 187 static inline int leds_direction_output(unsigned led, int value)
 188 {
 189         void __iomem **reg;
 190         u32 t, s;
 191
 192         reg = led_table[led].reg;
 193         s = led_table[led].mode_shift;
 194
 195         t = GPIO_READ(reg);
 196         t &= ~(LED_MODE_MASK << s);
 197
 198         switch (value) {
 199         case ADM5120_GPIO_LOW:
 200                 t |= (LED_MODE_OUT_LOW << s);
 201                 break;
 202         case ADM5120_GPIO_FLASH:
 203         case ADM5120_GPIO_LINK:
 204         case ADM5120_GPIO_SPEED:
 205         case ADM5120_GPIO_DUPLEX:
 206         case ADM5120_GPIO_ACT:
 207         case ADM5120_GPIO_COLL:
 208         case ADM5120_GPIO_LINK_ACT:
 209         case ADM5120_GPIO_DUPLEX_COLL:
 210         case ADM5120_GPIO_10M_ACT:
 211         case ADM5120_GPIO_100M_ACT:
 212                 t |= ((value & LED_MODE_MASK) << s);
 213                 break;
 214         default:
 215                 t |= (LED_MODE_OUT_HIGH << s);
 216                 break;
 217         }
 218
 219         GPIO_WRITE(t, reg);
 220
 221         return 0;
 222 }
 223
 224 static inline int leds_get_value(unsigned led)
 225 {
 226         void __iomem **reg;
 227         u32 t, m;
 228
 229         reg = led_table[led].reg;
 230
 231         t = GPIO_READ(reg);
 232         m = (t >> led_table[led].mode_shift) & LED_MODE_MASK;
 233         if (m == LED_MODE_INPUT)
 234                 return (t >> led_table[led].iv_shift) & 1;
 235
 236         if (m == LED_MODE_OUT_LOW)
 237                 return 0;
 238
 239         return 1;
 240 }
 241
 242 /*-------------------------------------------------------------------------*/
 243
 244 /*
 245  * Main GPIO support routines
 246  */
 247 int adm5120_gpio_direction_input(unsigned gpio)
 248 {
 249         if (gpio_is_invalid(gpio))
 250                 return -EINVAL;
 251
 252         if (gpio < ADM5120_GPIO_P0L0)
 253                 return pins_direction_input(gpio);
 254
 255         gpio -= ADM5120_GPIO_P0L0;
 256         return leds_direction_input(gpio);
 257 }
 258 EXPORT_SYMBOL(adm5120_gpio_direction_input);
 259
 260 int adm5120_gpio_direction_output(unsigned gpio, int value)
 261 {
 262         if (gpio_is_invalid(gpio))
 263                 return -EINVAL;
 264
 265         if (gpio < ADM5120_GPIO_P0L0)
 266                 return pins_direction_output(gpio, value);
 267
 268         gpio -= ADM5120_GPIO_P0L0;
 269         return leds_direction_output(gpio, value);
 270 }
 271 EXPORT_SYMBOL(adm5120_gpio_direction_output);
 272
 273 int adm5120_gpio_get_value(unsigned gpio)
 274 {
 275         if (gpio < ADM5120_GPIO_P0L0)
 276                 return pins_get_value(gpio);
 277
 278         gpio -= ADM5120_GPIO_P0L0;
 279         return leds_get_value(gpio);
 280 }
 281 EXPORT_SYMBOL(adm5120_gpio_get_value);
 282
 283 void adm5120_gpio_set_value(unsigned gpio, int value)
 284 {
 285         if (gpio < ADM5120_GPIO_P0L0) {
 286                 pins_set_value(gpio, value);
 287                 return;
 288         }
 289
 290         gpio -= ADM5120_GPIO_P0L0;
 291         leds_direction_output(gpio, value);
 292 }
 293 EXPORT_SYMBOL(adm5120_gpio_set_value);
 294
 295 int adm5120_gpio_request(unsigned gpio, const char *label)
 296 {
 297         if (gpio_is_invalid(gpio))
 298                 return -EINVAL;
 299
 300         if (gpio_is_used(gpio))
 301                 return -EBUSY;
 302
 303         adm5120_gpio_map[gpio].flags |= GPIO_FLAG_USED;
 304         adm5120_gpio_map[gpio].label = label;
 305
 306         return 0;
 307 }
 308 EXPORT_SYMBOL(adm5120_gpio_request);
 309
 310 void adm5120_gpio_free(unsigned gpio)
 311 {
 312         if (gpio_is_invalid(gpio))
 313                 return;
 314
 315         adm5120_gpio_map[gpio].flags &= ~GPIO_FLAG_USED;
 316         adm5120_gpio_map[gpio].label = NULL;
 317 }
 318 EXPORT_SYMBOL(adm5120_gpio_free);
 319
 320 int adm5120_gpio_to_irq(unsigned gpio)
 321 {
 322         if (gpio > ADM5120_GPIO_MAX)
 323                 return -EINVAL;
 324
 325         return adm5120_gpio_map[gpio].irq;
 326 }
 327 EXPORT_SYMBOL(adm5120_gpio_to_irq);
 328
 329 int adm5120_irq_to_gpio(unsigned irq)
 330 {
 331         int i;
 332
 333         for (i = 0; i < ADM5120_GPIO_COUNT; i++)
 334                 if (adm5120_gpio_map[i].irq == irq)
 335                         return i;
 336
 337         return -EINVAL;
 338 }
 339 EXPORT_SYMBOL(adm5120_irq_to_gpio);
 340
 341 /*-------------------------------------------------------------------------*/
 342
 343 void __init adm5120_gpio_csx0_enable(void)
 344 {
 345         gpio_conf2 |= GPIO_CONF2_CSX0;
 346         SW_WRITE_REG(GPIO_CONF2, gpio_conf2);
 347
 348         adm5120_gpio_map[ADM5120_GPIO_PIN1].flags &= ~GPIO_FLAG_VALID;
 349         adm5120_gpio_map[ADM5120_GPIO_PIN2].irq = ADM5120_IRQ_GPIO2;
 350 }
 351
 352 void __init adm5120_gpio_csx1_enable(void)
 353 {
 354         gpio_conf2 |= GPIO_CONF2_CSX1;
 355         SW_WRITE_REG(GPIO_CONF2, gpio_conf2);
 356
 357         adm5120_gpio_map[ADM5120_GPIO_PIN3].flags &= ~GPIO_FLAG_VALID;
 358         if (adm5120_package_bga())
 359                 adm5120_gpio_map[ADM5120_GPIO_PIN4].irq = ADM5120_IRQ_GPIO4;
 360 }
 361
 362 void __init adm5120_gpio_ew_enable(void)
 363 {
 364         gpio_conf2 |= GPIO_CONF2_EW;
 365         SW_WRITE_REG(GPIO_CONF2, gpio_conf2);
 366
 367         adm5120_gpio_map[ADM5120_GPIO_PIN0].flags &= ~GPIO_FLAG_VALID;
 368 }
 369
 370 void __init adm5120_gpio_init(void)
 371 {
 372         int i;
 373
 374         gpio_conf2 = 0;
 375         SW_WRITE_REG(GPIO_CONF2, gpio_conf2);
 376
 377         for (i = 0; i < ADM5120_GPIO_COUNT; i++)
 378                 adm5120_gpio_map[i].flags = GPIO_FLAG_VALID;
 379
 380         if (adm5120_package_pqfp()) {
 381                 adm5120_gpio_map[ADM5120_GPIO_PIN4].flags &= ~GPIO_FLAG_VALID;
 382                 adm5120_gpio_map[ADM5120_GPIO_PIN5].flags &= ~GPIO_FLAG_VALID;
 383                 adm5120_gpio_map[ADM5120_GPIO_PIN6].flags &= ~GPIO_FLAG_VALID;
 384                 adm5120_gpio_map[ADM5120_GPIO_PIN7].flags &= ~GPIO_FLAG_VALID;
 385         }
 386 }