target/linux/adm5120/files-3.14/arch/mips/adm5120/common/gpio.c

   1 /*
   2  *  ADM5120 generic GPIO API support via GPIOLIB
   3  *
   4  *  Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify it
   7  *  under the terms of the GNU General Public License version 2 as published
   8  *  by the Free Software Foundation.
   9  *
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/types.h>
  14 #include <linux/module.h>
  15 #include <linux/irq.h>
  16 #include <linux/delay.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/io.h>
  19 #include <linux/gpio.h>
  20
  21 #include <asm/addrspace.h>
  22
  23 #include <asm/mach-adm5120/adm5120_defs.h>
  24 #include <asm/mach-adm5120/adm5120_info.h>
  25 #include <asm/mach-adm5120/adm5120_switch.h>
  26
  27 #define GPIO_REG(r)     (void __iomem *)(KSEG1ADDR(ADM5120_SWITCH_BASE) + r)
  28
  29 struct gpio1_desc {
  30         void __iomem    *reg;           /* register address */
  31         u8              iv_shift;       /* shift amount for input bit */
  32         u8              mode_shift;     /* shift amount for mode bits */
  33 };
  34
  35 #define GPIO1_DESC(p, l) {                                              \
  36                 .reg = GPIO_REG(SWITCH_REG_PORT0_LED + ((p) * 4)),      \
  37                 .iv_shift = LED0_IV_SHIFT + (l),                        \
  38                 .mode_shift = (l) * 4                                   \
  39         }
  40
  41 static struct gpio1_desc gpio1_table[15] = {
  42         GPIO1_DESC(0, 0), GPIO1_DESC(0, 1), GPIO1_DESC(0, 2),
  43         GPIO1_DESC(1, 0), GPIO1_DESC(1, 1), GPIO1_DESC(1, 2),
  44         GPIO1_DESC(2, 0), GPIO1_DESC(2, 1), GPIO1_DESC(2, 2),
  45         GPIO1_DESC(3, 0), GPIO1_DESC(3, 1), GPIO1_DESC(3, 2),
  46         GPIO1_DESC(4, 0), GPIO1_DESC(4, 1), GPIO1_DESC(4, 2)
  47 };
  48
  49 static u32 gpio_conf2;
  50
  51 int adm5120_gpio_to_irq(unsigned gpio)
  52 {
  53         int ret;
  54
  55         switch (gpio) {
  56         case ADM5120_GPIO_PIN2:
  57                 ret = ADM5120_IRQ_GPIO2;
  58                 break;
  59         case ADM5120_GPIO_PIN4:
  60                 ret = ADM5120_IRQ_GPIO4;
  61                 break;
  62         default:
  63                 ret = -EINVAL;
  64                 break;
  65         }
  66
  67         return ret;
  68 }
  69 EXPORT_SYMBOL(adm5120_gpio_to_irq);
  70
  71 int adm5120_irq_to_gpio(unsigned irq)
  72 {
  73         int ret;
  74
  75         switch (irq) {
  76         case ADM5120_IRQ_GPIO2:
  77                 ret = ADM5120_GPIO_PIN2;
  78                 break;
  79         case ADM5120_IRQ_GPIO4:
  80                 ret = ADM5120_GPIO_PIN4;
  81                 break;
  82         default:
  83                 ret = -EINVAL;
  84                 break;
  85         }
  86
  87         return ret;
  88 }
  89 EXPORT_SYMBOL(adm5120_irq_to_gpio);
  90
  91 /*
  92  * Helpers for GPIO lines in GPIO_CONF0 register
  93  */
  94 #define PIN_IM(p)       ((1 << GPIO_CONF0_IM_SHIFT) << p)
  95 #define PIN_IV(p)       ((1 << GPIO_CONF0_IV_SHIFT) << p)
  96 #define PIN_OE(p)       ((1 << GPIO_CONF0_OE_SHIFT) << p)
  97 #define PIN_OV(p)       ((1 << GPIO_CONF0_OV_SHIFT) << p)
  98
  99 int __adm5120_gpio0_get_value(unsigned offset)
 100 {
 101         void __iomem **reg;
 102         u32 t;
 103
 104         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 105
 106         t = __raw_readl(reg);
 107         if ((t & PIN_IM(offset)) != 0)
 108                 t &= PIN_IV(offset);
 109         else
 110                 t &= PIN_OV(offset);
 111
 112         return (t) ? 1 : 0;
 113 }
 114 EXPORT_SYMBOL(__adm5120_gpio0_get_value);
 115
 116 void __adm5120_gpio0_set_value(unsigned offset, int value)
 117 {
 118         void __iomem **reg;
 119         u32 t;
 120
 121         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 122
 123         t = __raw_readl(reg);
 124         if (value == 0)
 125                 t &= ~(PIN_OV(offset));
 126         else
 127                 t |= PIN_OV(offset);
 128
 129         __raw_writel(t, reg);
 130 }
 131 EXPORT_SYMBOL(__adm5120_gpio0_set_value);
 132
 133 static int adm5120_gpio0_get_value(struct gpio_chip *chip, unsigned offset)
 134 {
 135         return __adm5120_gpio0_get_value(offset);
 136 }
 137
 138 static void adm5120_gpio0_set_value(struct gpio_chip *chip,
 139                                     unsigned offset, int value)
 140 {
 141         __adm5120_gpio0_set_value(offset, value);
 142 }
 143
 144 static int adm5120_gpio0_direction_input(struct gpio_chip *chip,
 145                                          unsigned offset)
 146 {
 147         void __iomem **reg;
 148         u32 t;
 149
 150         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 151
 152         t = __raw_readl(reg);
 153         t &= ~(PIN_OE(offset));
 154         t |= PIN_IM(offset);
 155         __raw_writel(t, reg);
 156
 157         return 0;
 158 }
 159
 160 static int adm5120_gpio0_direction_output(struct gpio_chip *chip,
 161                                           unsigned offset, int value)
 162 {
 163         void __iomem **reg;
 164         u32 t;
 165
 166         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 167
 168         t = __raw_readl(reg);
 169         t &= ~(PIN_IM(offset) | PIN_OV(offset));
 170         t |= PIN_OE(offset);
 171
 172         if (value)
 173                 t |= PIN_OV(offset);
 174
 175         __raw_writel(t, reg);
 176
 177         return 0;
 178 }
 179
 180 static struct gpio_chip adm5120_gpio0_chip = {
 181         .label                  = "adm5120 gpio0",
 182         .get                    = adm5120_gpio0_get_value,
 183         .set                    = adm5120_gpio0_set_value,
 184         .direction_input        = adm5120_gpio0_direction_input,
 185         .direction_output       = adm5120_gpio0_direction_output,
 186         .base                   = ADM5120_GPIO_PIN0,
 187         .ngpio                  = ADM5120_GPIO_PIN7 - ADM5120_GPIO_PIN0 + 1,
 188 };
 189
 190 int __adm5120_gpio1_get_value(unsigned offset)
 191 {
 192         void __iomem **reg;
 193         u32 t, m;
 194
 195         reg = gpio1_table[offset].reg;
 196
 197         t = __raw_readl(reg);
 198         m = (t >> gpio1_table[offset].mode_shift) & LED_MODE_MASK;
 199         if (m == LED_MODE_INPUT)
 200                 return (t >> gpio1_table[offset].iv_shift) & 1;
 201
 202         if (m == LED_MODE_OUT_LOW)
 203                 return 0;
 204
 205         return 1;
 206 }
 207 EXPORT_SYMBOL(__adm5120_gpio1_get_value);
 208
 209 void __adm5120_gpio1_set_value(unsigned offset, int value)
 210 {
 211         void __iomem **reg;
 212         u32 t, s;
 213
 214         reg = gpio1_table[offset].reg;
 215         s = gpio1_table[offset].mode_shift;
 216
 217         t = __raw_readl(reg);
 218         t &= ~(LED_MODE_MASK << s);
 219
 220         switch (value) {
 221         case ADM5120_GPIO_LOW:
 222                 t |= (LED_MODE_OUT_LOW << s);
 223                 break;
 224         case ADM5120_GPIO_FLASH:
 225         case ADM5120_GPIO_LINK:
 226         case ADM5120_GPIO_SPEED:
 227         case ADM5120_GPIO_DUPLEX:
 228         case ADM5120_GPIO_ACT:
 229         case ADM5120_GPIO_COLL:
 230         case ADM5120_GPIO_LINK_ACT:
 231         case ADM5120_GPIO_DUPLEX_COLL:
 232         case ADM5120_GPIO_10M_ACT:
 233         case ADM5120_GPIO_100M_ACT:
 234                 t |= ((value & LED_MODE_MASK) << s);
 235                 break;
 236         default:
 237                 t |= (LED_MODE_OUT_HIGH << s);
 238                 break;
 239         }
 240
 241         __raw_writel(t, reg);
 242 }
 243 EXPORT_SYMBOL(__adm5120_gpio1_set_value);
 244
 245 static int adm5120_gpio1_get_value(struct gpio_chip *chip, unsigned offset)
 246 {
 247         return __adm5120_gpio1_get_value(offset);
 248 }
 249
 250 static void adm5120_gpio1_set_value(struct gpio_chip *chip,
 251                                     unsigned offset, int value)
 252 {
 253         __adm5120_gpio1_set_value(offset, value);
 254 }
 255
 256 static int adm5120_gpio1_direction_input(struct gpio_chip *chip,
 257                                          unsigned offset)
 258 {
 259         void __iomem **reg;
 260         u32 t;
 261
 262         reg = gpio1_table[offset].reg;
 263         t = __raw_readl(reg);
 264         t &= ~(LED_MODE_MASK << gpio1_table[offset].mode_shift);
 265         __raw_writel(t, reg);
 266
 267         return 0;
 268 }
 269
 270 static int adm5120_gpio1_direction_output(struct gpio_chip *chip,
 271                                           unsigned offset, int value)
 272 {
 273         __adm5120_gpio1_set_value(offset, value);
 274         return 0;
 275 }
 276
 277 static struct gpio_chip adm5120_gpio1_chip = {
 278         .label                  = "adm5120 gpio1",
 279         .get                    = adm5120_gpio1_get_value,
 280         .set                    = adm5120_gpio1_set_value,
 281         .direction_input        = adm5120_gpio1_direction_input,
 282         .direction_output       = adm5120_gpio1_direction_output,
 283         .base                   = ADM5120_GPIO_P0L0,
 284         .ngpio                  = ADM5120_GPIO_P4L2 - ADM5120_GPIO_P0L0 + 1,
 285 };
 286
 287 void __init adm5120_gpio_csx0_enable(void)
 288 {
 289         gpio_conf2 |= GPIO_CONF2_CSX0;
 290         SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
 291
 292         gpio_request(ADM5120_GPIO_PIN1, "CSX0");
 293 }
 294
 295 void __init adm5120_gpio_csx1_enable(void)
 296 {
 297         gpio_conf2 |= GPIO_CONF2_CSX1;
 298         SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
 299
 300         gpio_request(ADM5120_GPIO_PIN3, "CSX1");
 301 }
 302
 303 void __init adm5120_gpio_ew_enable(void)
 304 {
 305         gpio_conf2 |= GPIO_CONF2_EW;
 306         SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
 307
 308         gpio_request(ADM5120_GPIO_PIN0, "EW");
 309 }
 310
 311 void __init adm5120_gpio_init(void)
 312 {
 313         int err;
 314
 315         SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
 316
 317         if (adm5120_package_pqfp())
 318                 adm5120_gpio0_chip.ngpio = 4;
 319
 320         err = gpiochip_add(&adm5120_gpio0_chip);
 321         if (err)
 322                 panic("cannot add ADM5120 GPIO0 chip, error=%d", err);
 323
 324         err = gpiochip_add(&adm5120_gpio1_chip);
 325         if (err)
 326                 panic("cannot add ADM5120 GPIO1 chip, error=%d", err);
 327
 328 }