arch/arm/plat-s3c24xx/gpiolib.c

   1 /* linux/arch/arm/plat-s3c24xx/gpiolib.c
   2  *
   3  * Copyright (c) 2008 Simtec Electronics
   4  *      http://armlinux.simtec.co.uk/
   5  *      Ben Dooks <ben@simtec.co.uk>
   6  *
   7  * S3C24XX GPIOlib support
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License.
  12 */
  13
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/module.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/ioport.h>
  19 #include <linux/io.h>
  20 #include <linux/gpio.h>
  21
  22 #include <asm/hardware.h>
  23 #include <asm/irq.h>
  24
  25 #include <asm/arch/regs-gpio.h>
  26
  27 struct s3c24xx_gpio_chip {
  28         struct gpio_chip        chip;
  29         void __iomem            *base;
  30 };
  31
  32 static inline struct s3c24xx_gpio_chip *to_s3c_chip(struct gpio_chip *gpc)
  33 {
  34         return container_of(gpc, struct s3c24xx_gpio_chip, chip);
  35 }
  36
  37 /* these routines are exported for use by other parts of the platform
  38  * and system support, but are not intended to be used directly by the
  39  * drivers themsevles.
  40  */
  41
  42 int s3c24xx_gpiolib_input(struct gpio_chip *chip, unsigned offset)
  43 {
  44         struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
  45         void __iomem *base = ourchip->base;
  46         unsigned long flags;
  47         unsigned long con;
  48
  49         local_irq_save(flags);
  50
  51         con = __raw_readl(base + 0x00);
  52         con &= ~(3 << (offset * 2));
  53         con |= (S3C2410_GPIO_OUTPUT & 0xf) << (offset * 2);
  54
  55         __raw_writel(con, base + 0x00);
  56
  57         local_irq_restore(flags);
  58         return 0;
  59 }
  60
  61 int s3c24xx_gpiolib_output(struct gpio_chip *chip,
  62                                   unsigned offset, int value)
  63 {
  64         struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
  65         void __iomem *base = ourchip->base;
  66         unsigned long flags;
  67         unsigned long dat;
  68         unsigned long con;
  69
  70         local_irq_save(flags);
  71
  72         dat = __raw_readl(base + 0x04);
  73         dat &= ~(1 << offset);
  74         if (value)
  75                 dat |= 1 << offset;
  76         __raw_writel(dat, base + 0x04);
  77
  78         con = __raw_readl(base + 0x00);
  79         con &= ~(3 << (offset * 2));
  80         con |= (S3C2410_GPIO_OUTPUT & 0xf) << (offset * 2);
  81
  82         __raw_writel(con, base + 0x00);
  83         __raw_writel(dat, base + 0x04);
  84
  85         local_irq_restore(flags);
  86         return 0;
  87 }
  88
  89 void s3c24xx_gpiolib_set(struct gpio_chip *chip, unsigned offset, int value)
  90 {
  91         struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
  92         void __iomem *base = ourchip->base;
  93         unsigned long flags;
  94         unsigned long dat;
  95
  96         local_irq_save(flags);
  97
  98         dat = __raw_readl(base + 0x04);
  99         dat &= ~(1 << offset);
 100         if (value)
 101                 dat |= 1 << offset;
 102         __raw_writel(dat, base + 0x04);
 103
 104         local_irq_restore(flags);
 105 }
 106
 107 int s3c24xx_gpiolib_get(struct gpio_chip *chip, unsigned offset)
 108 {
 109         struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
 110         unsigned long val;
 111
 112         val = __raw_readl(ourchip->base + 0x04);
 113         val >>= offset;
 114         val &= 1;
 115
 116         return val;
 117 }
 118
 119 static int s3c24xx_gpiolib_banka_input(struct gpio_chip *chip, unsigned offset)
 120 {
 121         return -EINVAL;
 122 }
 123
 124 static int s3c24xx_gpiolib_banka_output(struct gpio_chip *chip,
 125                                         unsigned offset, int value)
 126 {
 127         struct s3c24xx_gpio_chip *ourchip = to_s3c_chip(chip);
 128         void __iomem *base = ourchip->base;
 129         unsigned long flags;
 130         unsigned long dat;
 131         unsigned long con;
 132
 133         local_irq_save(flags);
 134
 135         con = __raw_readl(base + 0x00);
 136         dat = __raw_readl(base + 0x04);
 137
 138         dat &= ~(1 << offset);
 139         if (value)
 140                 dat |= 1 << offset;
 141
 142         __raw_writel(dat, base + 0x04);
 143
 144         con &= ~(1 << offset);
 145
 146         __raw_writel(con, base + 0x00);
 147         __raw_writel(dat, base + 0x04);
 148
 149         local_irq_restore(flags);
 150         return 0;
 151 }
 152
 153
 154 struct s3c24xx_gpio_chip gpios[] = {
 155         [0] = {
 156                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPA0),
 157                 .chip   = {
 158                         .base                   = S3C2410_GPA0,
 159                         .owner                  = THIS_MODULE,
 160                         .label                  = "GPIOA",
 161                         .ngpio                  = 24,
 162                         .direction_input        = s3c24xx_gpiolib_banka_input,
 163                         .direction_output       = s3c24xx_gpiolib_banka_output,
 164                         .set                    = s3c24xx_gpiolib_set,
 165                         .get                    = s3c24xx_gpiolib_get,
 166                 },
 167         },
 168         [1] = {
 169                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPB0),
 170                 .chip   = {
 171                         .base                   = S3C2410_GPB0,
 172                         .owner                  = THIS_MODULE,
 173                         .label                  = "GPIOB",
 174                         .ngpio                  = 16,
 175                         .direction_input        = s3c24xx_gpiolib_input,
 176                         .direction_output       = s3c24xx_gpiolib_output,
 177                         .set                    = s3c24xx_gpiolib_set,
 178                         .get                    = s3c24xx_gpiolib_get,
 179                 },
 180         },
 181         [2] = {
 182                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPC0),
 183                 .chip   = {
 184                         .base                   = S3C2410_GPC0,
 185                         .owner                  = THIS_MODULE,
 186                         .label                  = "GPIOC",
 187                         .ngpio                  = 16,
 188                         .direction_input        = s3c24xx_gpiolib_input,
 189                         .direction_output       = s3c24xx_gpiolib_output,
 190                         .set                    = s3c24xx_gpiolib_set,
 191                         .get                    = s3c24xx_gpiolib_get,
 192                 },
 193         },
 194         [3] = {
 195                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPD0),
 196                 .chip   = {
 197                         .base                   = S3C2410_GPD0,
 198                         .owner                  = THIS_MODULE,
 199                         .label                  = "GPIOD",
 200                         .ngpio                  = 16,
 201                         .direction_input        = s3c24xx_gpiolib_input,
 202                         .direction_output       = s3c24xx_gpiolib_output,
 203                         .set                    = s3c24xx_gpiolib_set,
 204                         .get                    = s3c24xx_gpiolib_get,
 205                 },
 206         },
 207         [4] = {
 208                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPE0),
 209                 .chip   = {
 210                         .base                   = S3C2410_GPE0,
 211                         .label                  = "GPIOE",
 212                         .owner                  = THIS_MODULE,
 213                         .ngpio                  = 16,
 214                         .direction_input        = s3c24xx_gpiolib_input,
 215                         .direction_output       = s3c24xx_gpiolib_output,
 216                         .set                    = s3c24xx_gpiolib_set,
 217                         .get                    = s3c24xx_gpiolib_get,
 218                 },
 219         },
 220         [5] = {
 221                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPF0),
 222                 .chip   = {
 223                         .base                   = S3C2410_GPF0,
 224                         .owner                  = THIS_MODULE,
 225                         .label                  = "GPIOF",
 226                         .ngpio                  = 8,
 227                         .direction_input        = s3c24xx_gpiolib_input,
 228                         .direction_output       = s3c24xx_gpiolib_output,
 229                         .set                    = s3c24xx_gpiolib_set,
 230                         .get                    = s3c24xx_gpiolib_get,
 231                 },
 232         },
 233         [6] = {
 234                 .base   = S3C24XX_GPIO_BASE(S3C2410_GPG0),
 235                 .chip   = {
 236                         .base                   = S3C2410_GPG0,
 237                         .owner                  = THIS_MODULE,
 238                         .label                  = "GPIOG",
 239                         .ngpio                  = 10,
 240                         .direction_input        = s3c24xx_gpiolib_input,
 241                         .direction_output       = s3c24xx_gpiolib_output,
 242                         .set                    = s3c24xx_gpiolib_set,
 243                         .get                    = s3c24xx_gpiolib_get,
 244                 },
 245         },
 246 };
 247
 248 static __init int s3c24xx_gpiolib_init(void)
 249 {
 250         struct s3c24xx_gpio_chip *chip = gpios;
 251         int gpn;
 252
 253         for (gpn = 0; gpn < ARRAY_SIZE(gpios); gpn++, chip++)
 254                 gpiochip_add(&chip->chip);
 255
 256         return 0;
 257 }
 258
 259 arch_initcall(s3c24xx_gpiolib_init);