Ben Dooks | 21b2366 | 2008-10-31 16:14:34 +0000 | [diff] [blame] | 1 | /* linux/arch/arm/plat-s3c/gpio-config.c |
| 2 | * |
| 3 | * Copyright 2008 Openmoko, Inc. |
Ben Dooks | 97a3399 | 2010-05-06 10:27:16 +0900 | [diff] [blame^] | 4 | * Copyright 2008-2010 Simtec Electronics |
Ben Dooks | 21b2366 | 2008-10-31 16:14:34 +0000 | [diff] [blame] | 5 | * Ben Dooks <ben@simtec.co.uk> |
| 6 | * http://armlinux.simtec.co.uk/ |
| 7 | * |
| 8 | * S3C series GPIO configuration core |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/kernel.h> |
Ben Dooks | db75639 | 2009-03-10 23:21:48 +0000 | [diff] [blame] | 16 | #include <linux/module.h> |
Ben Dooks | 21b2366 | 2008-10-31 16:14:34 +0000 | [diff] [blame] | 17 | #include <linux/gpio.h> |
| 18 | #include <linux/io.h> |
| 19 | |
Ben Dooks | e856bb1 | 2010-01-19 17:14:46 +0900 | [diff] [blame] | 20 | #include <plat/gpio-core.h> |
Ben Dooks | 21b2366 | 2008-10-31 16:14:34 +0000 | [diff] [blame] | 21 | #include <plat/gpio-cfg.h> |
| 22 | #include <plat/gpio-cfg-helpers.h> |
| 23 | |
| 24 | int s3c_gpio_cfgpin(unsigned int pin, unsigned int config) |
| 25 | { |
| 26 | struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin); |
| 27 | unsigned long flags; |
| 28 | int offset; |
| 29 | int ret; |
| 30 | |
| 31 | if (!chip) |
| 32 | return -EINVAL; |
| 33 | |
| 34 | offset = pin - chip->chip.base; |
| 35 | |
| 36 | local_irq_save(flags); |
| 37 | ret = s3c_gpio_do_setcfg(chip, offset, config); |
| 38 | local_irq_restore(flags); |
| 39 | |
| 40 | return ret; |
| 41 | } |
Ben Dooks | db75639 | 2009-03-10 23:21:48 +0000 | [diff] [blame] | 42 | EXPORT_SYMBOL(s3c_gpio_cfgpin); |
Ben Dooks | 21b2366 | 2008-10-31 16:14:34 +0000 | [diff] [blame] | 43 | |
| 44 | int s3c_gpio_setpull(unsigned int pin, s3c_gpio_pull_t pull) |
| 45 | { |
| 46 | struct s3c_gpio_chip *chip = s3c_gpiolib_getchip(pin); |
| 47 | unsigned long flags; |
| 48 | int offset, ret; |
| 49 | |
| 50 | if (!chip) |
| 51 | return -EINVAL; |
| 52 | |
| 53 | offset = pin - chip->chip.base; |
| 54 | |
| 55 | local_irq_save(flags); |
| 56 | ret = s3c_gpio_do_setpull(chip, offset, pull); |
| 57 | local_irq_restore(flags); |
| 58 | |
| 59 | return ret; |
| 60 | } |
Ben Dooks | db75639 | 2009-03-10 23:21:48 +0000 | [diff] [blame] | 61 | EXPORT_SYMBOL(s3c_gpio_setpull); |
Ben Dooks | 21b2366 | 2008-10-31 16:14:34 +0000 | [diff] [blame] | 62 | |
| 63 | #ifdef CONFIG_S3C_GPIO_CFG_S3C24XX |
Ben Dooks | 9bbb851 | 2010-04-30 19:30:35 +0900 | [diff] [blame] | 64 | int s3c_gpio_setcfg_s3c24xx_a(struct s3c_gpio_chip *chip, |
| 65 | unsigned int off, unsigned int cfg) |
Ben Dooks | 21b2366 | 2008-10-31 16:14:34 +0000 | [diff] [blame] | 66 | { |
| 67 | void __iomem *reg = chip->base; |
| 68 | unsigned int shift = off; |
| 69 | u32 con; |
| 70 | |
| 71 | if (s3c_gpio_is_cfg_special(cfg)) { |
| 72 | cfg &= 0xf; |
| 73 | |
| 74 | /* Map output to 0, and SFN2 to 1 */ |
| 75 | cfg -= 1; |
| 76 | if (cfg > 1) |
| 77 | return -EINVAL; |
| 78 | |
| 79 | cfg <<= shift; |
| 80 | } |
| 81 | |
| 82 | con = __raw_readl(reg); |
| 83 | con &= ~(0x1 << shift); |
| 84 | con |= cfg; |
| 85 | __raw_writel(con, reg); |
| 86 | |
| 87 | return 0; |
| 88 | } |
| 89 | |
Ben Dooks | 97a3399 | 2010-05-06 10:27:16 +0900 | [diff] [blame^] | 90 | unsigned s3c_gpio_getcfg_s3c24xx_a(struct s3c_gpio_chip *chip, |
| 91 | unsigned int off) |
| 92 | { |
| 93 | u32 con; |
| 94 | |
| 95 | con = __raw_readl(chip->base); |
| 96 | con >>= off; |
| 97 | con &= 1; |
| 98 | con++; |
| 99 | |
| 100 | return S3C_GPIO_SFN(con); |
| 101 | } |
| 102 | |
Ben Dooks | 21b2366 | 2008-10-31 16:14:34 +0000 | [diff] [blame] | 103 | int s3c_gpio_setcfg_s3c24xx(struct s3c_gpio_chip *chip, |
| 104 | unsigned int off, unsigned int cfg) |
| 105 | { |
| 106 | void __iomem *reg = chip->base; |
| 107 | unsigned int shift = off * 2; |
| 108 | u32 con; |
| 109 | |
| 110 | if (s3c_gpio_is_cfg_special(cfg)) { |
| 111 | cfg &= 0xf; |
| 112 | if (cfg > 3) |
| 113 | return -EINVAL; |
| 114 | |
| 115 | cfg <<= shift; |
| 116 | } |
| 117 | |
| 118 | con = __raw_readl(reg); |
| 119 | con &= ~(0x3 << shift); |
| 120 | con |= cfg; |
| 121 | __raw_writel(con, reg); |
| 122 | |
| 123 | return 0; |
| 124 | } |
Ben Dooks | 97a3399 | 2010-05-06 10:27:16 +0900 | [diff] [blame^] | 125 | |
| 126 | unsigned int s3c_gpio_getcfg_s3c24xx(struct s3c_gpio_chip *chip, |
| 127 | unsigned int off) |
| 128 | { |
| 129 | u32 con; |
| 130 | |
| 131 | con = __raw_readl(chip->base); |
| 132 | con >>= off * 2; |
| 133 | con &= 3; |
| 134 | |
| 135 | /* this conversion works for IN and OUT as well as special mode */ |
| 136 | return S3C_GPIO_SPECIAL(con); |
| 137 | } |
Ben Dooks | 21b2366 | 2008-10-31 16:14:34 +0000 | [diff] [blame] | 138 | #endif |
| 139 | |
| 140 | #ifdef CONFIG_S3C_GPIO_CFG_S3C64XX |
| 141 | int s3c_gpio_setcfg_s3c64xx_4bit(struct s3c_gpio_chip *chip, |
| 142 | unsigned int off, unsigned int cfg) |
| 143 | { |
| 144 | void __iomem *reg = chip->base; |
| 145 | unsigned int shift = (off & 7) * 4; |
| 146 | u32 con; |
| 147 | |
Marek Szyprowski | 49fb88a | 2009-06-18 13:30:16 +0200 | [diff] [blame] | 148 | if (off < 8 && chip->chip.ngpio > 8) |
Ben Dooks | 21b2366 | 2008-10-31 16:14:34 +0000 | [diff] [blame] | 149 | reg -= 4; |
| 150 | |
| 151 | if (s3c_gpio_is_cfg_special(cfg)) { |
| 152 | cfg &= 0xf; |
| 153 | cfg <<= shift; |
| 154 | } |
| 155 | |
| 156 | con = __raw_readl(reg); |
| 157 | con &= ~(0xf << shift); |
| 158 | con |= cfg; |
| 159 | __raw_writel(con, reg); |
| 160 | |
| 161 | return 0; |
| 162 | } |
Ben Dooks | 97a3399 | 2010-05-06 10:27:16 +0900 | [diff] [blame^] | 163 | |
| 164 | unsigned s3c_gpio_getcfg_s3c64xx_4bit(struct s3c_gpio_chip *chip, |
| 165 | unsigned int off) |
| 166 | { |
| 167 | void __iomem *reg = chip->base; |
| 168 | unsigned int shift = (off & 7) * 4; |
| 169 | u32 con; |
| 170 | |
| 171 | if (off < 8 && chip->chip.ngpio > 8) |
| 172 | reg -= 4; |
| 173 | |
| 174 | con = __raw_readl(reg); |
| 175 | con >>= shift; |
| 176 | con &= 0xf; |
| 177 | |
| 178 | /* this conversion works for IN and OUT as well as special mode */ |
| 179 | return S3C_GPIO_SPECIAL(con); |
| 180 | } |
| 181 | |
Ben Dooks | 21b2366 | 2008-10-31 16:14:34 +0000 | [diff] [blame] | 182 | #endif /* CONFIG_S3C_GPIO_CFG_S3C64XX */ |
| 183 | |
| 184 | #ifdef CONFIG_S3C_GPIO_PULL_UPDOWN |
| 185 | int s3c_gpio_setpull_updown(struct s3c_gpio_chip *chip, |
| 186 | unsigned int off, s3c_gpio_pull_t pull) |
| 187 | { |
| 188 | void __iomem *reg = chip->base + 0x08; |
| 189 | int shift = off * 2; |
| 190 | u32 pup; |
| 191 | |
| 192 | pup = __raw_readl(reg); |
| 193 | pup &= ~(3 << shift); |
| 194 | pup |= pull << shift; |
| 195 | __raw_writel(pup, reg); |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | s3c_gpio_pull_t s3c_gpio_getpull_updown(struct s3c_gpio_chip *chip, |
| 201 | unsigned int off) |
| 202 | { |
| 203 | void __iomem *reg = chip->base + 0x08; |
| 204 | int shift = off * 2; |
| 205 | u32 pup = __raw_readl(reg); |
| 206 | |
| 207 | pup >>= shift; |
| 208 | pup &= 0x3; |
| 209 | return (__force s3c_gpio_pull_t)pup; |
| 210 | } |
| 211 | #endif |
Ben Dooks | 1ec7269 | 2010-05-03 14:39:45 +0900 | [diff] [blame] | 212 | |
| 213 | #ifdef CONFIG_S3C_GPIO_PULL_UP |
| 214 | int s3c_gpio_setpull_1up(struct s3c_gpio_chip *chip, |
| 215 | unsigned int off, s3c_gpio_pull_t pull) |
| 216 | { |
| 217 | void __iomem *reg = chip->base + 0x08; |
| 218 | u32 pup = __raw_readl(reg); |
| 219 | |
| 220 | pup = __raw_readl(reg); |
| 221 | |
| 222 | if (pup == S3C_GPIO_PULL_UP) |
| 223 | pup &= ~(1 << off); |
| 224 | else if (pup == S3C_GPIO_PULL_NONE) |
| 225 | pup |= (1 << off); |
| 226 | else |
| 227 | return -EINVAL; |
| 228 | |
| 229 | __raw_writel(pup, reg); |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | s3c_gpio_pull_t s3c_gpio_getpull_1up(struct s3c_gpio_chip *chip, |
| 234 | unsigned int off) |
| 235 | { |
| 236 | void __iomem *reg = chip->base + 0x08; |
| 237 | u32 pup = __raw_readl(reg); |
| 238 | |
| 239 | pup &= (1 << off); |
| 240 | return pup ? S3C_GPIO_PULL_NONE : S3C_GPIO_PULL_UP; |
| 241 | } |
| 242 | #endif /* CONFIG_S3C_GPIO_PULL_UP */ |
| 243 | |