target/linux/adm5120/files/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/autoconf.h>
  13 #include <linux/init.h>
  14 #include <linux/types.h>
  15 #include <linux/module.h>
  16 #include <linux/irq.h>
  17 #include <linux/delay.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/io.h>
  20 #include <linux/gpio.h>
  21
  22 #include <asm/addrspace.h>
  23
  24 #include <asm/mach-adm5120/adm5120_defs.h>
  25 #include <asm/mach-adm5120/adm5120_info.h>
  26 #include <asm/mach-adm5120/adm5120_switch.h>
  27
  28 #define GPIO_REG(r)     (void __iomem *)(KSEG1ADDR(ADM5120_SWITCH_BASE) + r)
  29
  30 struct gpio1_desc {
  31         void __iomem    *reg;           /* register address */
  32         u8              iv_shift;       /* shift amount for input bit */
  33         u8              mode_shift;     /* shift amount for mode bits */
  34 };
  35
  36 #define GPIO1_DESC(p, l) {                                              \
  37                 .reg = GPIO_REG(SWITCH_REG_PORT0_LED + ((p) * 4)),      \
  38                 .iv_shift = LED0_IV_SHIFT + (l),                        \
  39                 .mode_shift = (l) * 4                                   \
  40         }
  41
  42 static struct gpio1_desc gpio1_table[15] = {
  43         GPIO1_DESC(0, 0), GPIO1_DESC(0, 1), GPIO1_DESC(0, 2),
  44         GPIO1_DESC(1, 0), GPIO1_DESC(1, 1), GPIO1_DESC(1, 2),
  45         GPIO1_DESC(2, 0), GPIO1_DESC(2, 1), GPIO1_DESC(2, 2),
  46         GPIO1_DESC(3, 0), GPIO1_DESC(3, 1), GPIO1_DESC(3, 2),
  47         GPIO1_DESC(4, 0), GPIO1_DESC(4, 1), GPIO1_DESC(4, 2)
  48 };
  49
  50 static u32 gpio_conf2;
  51
  52 int adm5120_gpio_to_irq(unsigned gpio)
  53 {
  54         int ret;
  55
  56         switch (gpio) {
  57         case ADM5120_GPIO_PIN2:
  58                 ret = ADM5120_IRQ_GPIO2;
  59                 break;
  60         case ADM5120_GPIO_PIN4:
  61                 ret = ADM5120_IRQ_GPIO4;
  62                 break;
  63         default:
  64                 ret = -EINVAL;
  65                 break;
  66         }
  67
  68         return ret;
  69 }
  70 EXPORT_SYMBOL(adm5120_gpio_to_irq);
  71
  72 int adm5120_irq_to_gpio(unsigned irq)
  73 {
  74         int ret;
  75
  76         switch (irq) {
  77         case ADM5120_IRQ_GPIO2:
  78                 ret = ADM5120_GPIO_PIN2;
  79                 break;
  80         case ADM5120_IRQ_GPIO4:
  81                 ret = ADM5120_GPIO_PIN4;
  82                 break;
  83         default:
  84                 ret = -EINVAL;
  85                 break;
  86         }
  87
  88         return ret;
  89 }
  90 EXPORT_SYMBOL(adm5120_irq_to_gpio);
  91
  92 /*
  93  * Helpers for GPIO lines in GPIO_CONF0 register
  94  */
  95 #define PIN_IM(p)       ((1 << GPIO_CONF0_IM_SHIFT) << p)
  96 #define PIN_IV(p)       ((1 << GPIO_CONF0_IV_SHIFT) << p)
  97 #define PIN_OE(p)       ((1 << GPIO_CONF0_OE_SHIFT) << p)
  98 #define PIN_OV(p)       ((1 << GPIO_CONF0_OV_SHIFT) << p)
  99
 100 int __adm5120_gpio0_get_value(unsigned offset)
 101 {
 102         void __iomem **reg;
 103         u32 t;
 104
 105         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 106
 107         t = __raw_readl(reg);
 108         if ((t & PIN_IM(offset)) != 0)
 109                 t &= PIN_IV(offset);
 110         else
 111                 t &= PIN_OV(offset);
 112
 113         return (t) ? 1 : 0;
 114 }
 115 EXPORT_SYMBOL(__adm5120_gpio0_get_value);
 116
 117 void __adm5120_gpio0_set_value(unsigned offset, int value)
 118 {
 119         void __iomem **reg;
 120         u32 t;
 121
 122         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 123
 124         t = __raw_readl(reg);
 125         if (value == 0)
 126                 t &= ~(PIN_OV(offset));
 127         else
 128                 t |= PIN_OV(offset);
 129
 130         __raw_writel(t, reg);
 131 }
 132 EXPORT_SYMBOL(__adm5120_gpio0_set_value);
 133
 134 static int adm5120_gpio0_get_value(struct gpio_chip *chip, unsigned offset)
 135 {
 136         return __adm5120_gpio0_get_value(offset);
 137 }
 138
 139 static void adm5120_gpio0_set_value(struct gpio_chip *chip,
 140                                     unsigned offset, int value)
 141 {
 142         __adm5120_gpio0_set_value(offset, value);
 143 }
 144
 145 static int adm5120_gpio0_direction_input(struct gpio_chip *chip,
 146                                          unsigned offset)
 147 {
 148         void __iomem **reg;
 149         u32 t;
 150
 151         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 152
 153         t = __raw_readl(reg);
 154         t &= ~(PIN_OE(offset));
 155         t |= PIN_IM(offset);
 156         __raw_writel(t, reg);
 157
 158         return 0;
 159 }
 160
 161 static int adm5120_gpio0_direction_output(struct gpio_chip *chip,
 162                                           unsigned offset, int value)
 163 {
 164         void __iomem **reg;
 165         u32 t;
 166
 167         reg = GPIO_REG(SWITCH_REG_GPIO_CONF0);
 168
 169         t = __raw_readl(reg);
 170         t &= ~(PIN_IM(offset) | PIN_OV(offset));
 171         t |= PIN_OE(offset);
 172
 173         if (value)
 174                 t |= PIN_OV(offset);
 175
 176         __raw_writel(t, reg);
 177
 178         return 0;
 179 }
 180
 181 static struct gpio_chip adm5120_gpio0_chip = {
 182         .label                  = "adm5120 gpio0",
 183         .get                    = adm5120_gpio0_get_value,
 184         .set                    = adm5120_gpio0_set_value,
 185         .direction_input        = adm5120_gpio0_direction_input,
 186         .direction_output       = adm5120_gpio0_direction_output,
 187         .base                   = ADM5120_GPIO_PIN0,
 188         .ngpio                  = ADM5120_GPIO_PIN7 - ADM5120_GPIO_PIN0 + 1,
 189 };
 190
 191 int __adm5120_gpio1_get_value(unsigned offset)
 192 {
 193         void __iomem **reg;
 194         u32 t, m;
 195
 196         reg = gpio1_table[offset].reg;
 197
 198         t = __raw_readl(reg);
 199         m = (t >> gpio1_table[offset].mode_shift) & LED_MODE_MASK;
 200         if (m == LED_MODE_INPUT)
 201                 return (t >> gpio1_table[offset].iv_shift) & 1;
 202
 203         if (m == LED_MODE_OUT_LOW)
 204                 return 0;
 205
 206         return 1;
 207 }
 208 EXPORT_SYMBOL(__adm5120_gpio1_get_value);
 209
 210 void __adm5120_gpio1_set_value(unsigned offset, int value)
 211 {
 212         void __iomem **reg;
 213         u32 t, s;
 214
 215         reg = gpio1_table[offset].reg;
 216         s = gpio1_table[offset].mode_shift;
 217
 218         t = __raw_readl(reg);
 219         t &= ~(LED_MODE_MASK << s);
 220
 221         switch (value) {
 222         case ADM5120_GPIO_LOW:
 223                 t |= (LED_MODE_OUT_LOW << s);
 224                 break;
 225         case ADM5120_GPIO_FLASH:
 226         case ADM5120_GPIO_LINK:
 227         case ADM5120_GPIO_SPEED:
 228         case ADM5120_GPIO_DUPLEX:
 229         case ADM5120_GPIO_ACT:
 230         case ADM5120_GPIO_COLL:
 231         case ADM5120_GPIO_LINK_ACT:
 232         case ADM5120_GPIO_DUPLEX_COLL:
 233         case ADM5120_GPIO_10M_ACT:
 234         case ADM5120_GPIO_100M_ACT:
 235                 t |= ((value & LED_MODE_MASK) << s);
 236                 break;
 237         default:
 238                 t |= (LED_MODE_OUT_HIGH << s);
 239                 break;
 240         }
 241
 242         __raw_writel(t, reg);
 243 }
 244 EXPORT_SYMBOL(__adm5120_gpio1_set_value);
 245
 246 static int adm5120_gpio1_get_value(struct gpio_chip *chip, unsigned offset)
 247 {
 248         return __adm5120_gpio1_get_value(offset);
 249 }
 250
 251 static void adm5120_gpio1_set_value(struct gpio_chip *chip,
 252                                     unsigned offset, int value)
 253 {
 254         __adm5120_gpio1_set_value(offset, value);
 255 }
 256
 257 static int adm5120_gpio1_direction_input(struct gpio_chip *chip,
 258                                          unsigned offset)
 259 {
 260         void __iomem **reg;
 261         u32 t;
 262
 263         reg = gpio1_table[offset].reg;
 264         t = __raw_readl(reg);
 265         t &= ~(LED_MODE_MASK << gpio1_table[offset].mode_shift);
 266         __raw_writel(t, reg);
 267
 268         return 0;
 269 }
 270
 271 static int adm5120_gpio1_direction_output(struct gpio_chip *chip,
 272                                           unsigned offset, int value)
 273 {
 274         __adm5120_gpio1_set_value(offset, value);
 275         return 0;
 276 }
 277
 278 static struct gpio_chip adm5120_gpio1_chip = {
 279         .label                  = "adm5120 gpio1",
 280         .get                    = adm5120_gpio1_get_value,
 281         .set                    = adm5120_gpio1_set_value,
 282         .direction_input        = adm5120_gpio1_direction_input,
 283         .direction_output       = adm5120_gpio1_direction_output,
 284         .base                   = ADM5120_GPIO_P0L0,
 285         .ngpio                  = ADM5120_GPIO_P4L2 - ADM5120_GPIO_P0L0 + 1,
 286 };
 287
 288 void __init adm5120_gpio_csx0_enable(void)
 289 {
 290         gpio_conf2 |= GPIO_CONF2_CSX0;
 291         SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
 292
 293         gpio_request(ADM5120_GPIO_PIN1, "CSX0");
 294 }
 295
 296 void __init adm5120_gpio_csx1_enable(void)
 297 {
 298         gpio_conf2 |= GPIO_CONF2_CSX1;
 299         SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
 300
 301         gpio_request(ADM5120_GPIO_PIN3, "CSX1");
 302 }
 303
 304 void __init adm5120_gpio_ew_enable(void)
 305 {
 306         gpio_conf2 |= GPIO_CONF2_EW;
 307         SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
 308
 309         gpio_request(ADM5120_GPIO_PIN0, "EW");
 310 }
 311
 312 void __init adm5120_gpio_init(void)
 313 {
 314         int err;
 315
 316         SW_WRITE_REG(SWITCH_REG_GPIO_CONF2, gpio_conf2);
 317
 318         if (adm5120_package_pqfp()) {
 319                 gpiochip_reserve(ADM5120_GPIO_PIN4, 4);
 320                 adm5120_gpio0_chip.ngpio = 4;
 321         }
 322
 323         err = gpiochip_add(&adm5120_gpio0_chip);
 324         if (err)
 325                 panic("cannot add ADM5120 GPIO0 chip, error=%d", err);
 326
 327         err = gpiochip_add(&adm5120_gpio1_chip);
 328         if (err)
 329                 panic("cannot add ADM5120 GPIO1 chip, error=%d", err);
 330
 331 }