1 /* 2 * (C) Copyright 2009 Samsung Electronics 3 * Minkyu Kang <mk7.kang@samsung.com> 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation; either version 2 of 8 * the License, or (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, 18 * MA 02111-1307 USA 19 */ 20 21 #include <common.h> 22 #include <asm/io.h> 23 #include <asm/gpio.h> 24 25 #define CON_MASK(x) (0xf << ((x) << 2)) 26 #define CON_SFR(x, v) ((v) << ((x) << 2)) 27 28 #define DAT_MASK(x) (0x1 << (x)) 29 #define DAT_SET(x) (0x1 << (x)) 30 31 #define PULL_MASK(x) (0x3 << ((x) << 1)) 32 #define PULL_MODE(x, v) ((v) << ((x) << 1)) 33 34 #define DRV_MASK(x) (0x3 << ((x) << 1)) 35 #define DRV_SET(x, m) ((m) << ((x) << 1)) 36 #define RATE_MASK(x) (0x1 << (x + 16)) 37 #define RATE_SET(x) (0x1 << (x + 16)) 38 39 void s5p_gpio_cfg_pin(struct s5p_gpio_bank *bank, int gpio, int cfg) 40 { 41 unsigned int value; 42 43 value = readl(&bank->con); 44 value &= ~CON_MASK(gpio); 45 value |= CON_SFR(gpio, cfg); 46 writel(value, &bank->con); 47 } 48 49 void s5p_gpio_direction_output(struct s5p_gpio_bank *bank, int gpio, int en) 50 { 51 unsigned int value; 52 53 s5p_gpio_cfg_pin(bank, gpio, GPIO_OUTPUT); 54 55 value = readl(&bank->dat); 56 value &= ~DAT_MASK(gpio); 57 if (en) 58 value |= DAT_SET(gpio); 59 writel(value, &bank->dat); 60 } 61 62 void s5p_gpio_direction_input(struct s5p_gpio_bank *bank, int gpio) 63 { 64 s5p_gpio_cfg_pin(bank, gpio, GPIO_INPUT); 65 } 66 67 void s5p_gpio_set_value(struct s5p_gpio_bank *bank, int gpio, int en) 68 { 69 unsigned int value; 70 71 value = readl(&bank->dat); 72 value &= ~DAT_MASK(gpio); 73 if (en) 74 value |= DAT_SET(gpio); 75 writel(value, &bank->dat); 76 } 77 78 unsigned int s5p_gpio_get_value(struct s5p_gpio_bank *bank, int gpio) 79 { 80 unsigned int value; 81 82 value = readl(&bank->dat); 83 return !!(value & DAT_MASK(gpio)); 84 } 85 86 void s5p_gpio_set_pull(struct s5p_gpio_bank *bank, int gpio, int mode) 87 { 88 unsigned int value; 89 90 value = readl(&bank->pull); 91 value &= ~PULL_MASK(gpio); 92 93 switch (mode) { 94 case GPIO_PULL_DOWN: 95 case GPIO_PULL_UP: 96 value |= PULL_MODE(gpio, mode); 97 break; 98 default: 99 break; 100 } 101 102 writel(value, &bank->pull); 103 } 104 105 void s5p_gpio_set_drv(struct s5p_gpio_bank *bank, int gpio, int mode) 106 { 107 unsigned int value; 108 109 value = readl(&bank->drv); 110 value &= ~DRV_MASK(gpio); 111 112 switch (mode) { 113 case GPIO_DRV_1X: 114 case GPIO_DRV_2X: 115 case GPIO_DRV_3X: 116 case GPIO_DRV_4X: 117 value |= DRV_SET(gpio, mode); 118 break; 119 default: 120 return; 121 } 122 123 writel(value, &bank->drv); 124 } 125 126 void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode) 127 { 128 unsigned int value; 129 130 value = readl(&bank->drv); 131 value &= ~RATE_MASK(gpio); 132 133 switch (mode) { 134 case GPIO_DRV_FAST: 135 case GPIO_DRV_SLOW: 136 value |= RATE_SET(gpio); 137 break; 138 default: 139 return; 140 } 141 142 writel(value, &bank->drv); 143 } 144 145 struct s5p_gpio_bank *s5p_gpio_get_bank(unsigned gpio) 146 { 147 int bank = gpio / GPIO_PER_BANK; 148 bank *= sizeof(struct s5p_gpio_bank); 149 150 return (struct s5p_gpio_bank *) (s5p_gpio_base(gpio) + bank); 151 } 152 153 int s5p_gpio_get_pin(unsigned gpio) 154 { 155 return gpio % GPIO_PER_BANK; 156 } 157 158 /* Common GPIO API */ 159 160 int gpio_request(unsigned gpio, const char *label) 161 { 162 return 0; 163 } 164 165 int gpio_free(unsigned gpio) 166 { 167 return 0; 168 } 169 170 int gpio_direction_input(unsigned gpio) 171 { 172 s5p_gpio_direction_input(s5p_gpio_get_bank(gpio), 173 s5p_gpio_get_pin(gpio)); 174 return 0; 175 } 176 177 int gpio_direction_output(unsigned gpio, int value) 178 { 179 s5p_gpio_direction_output(s5p_gpio_get_bank(gpio), 180 s5p_gpio_get_pin(gpio), value); 181 return 0; 182 } 183 184 int gpio_get_value(unsigned gpio) 185 { 186 return (int) s5p_gpio_get_value(s5p_gpio_get_bank(gpio), 187 s5p_gpio_get_pin(gpio)); 188 } 189 190 int gpio_set_value(unsigned gpio, int value) 191 { 192 s5p_gpio_set_value(s5p_gpio_get_bank(gpio), 193 s5p_gpio_get_pin(gpio), value); 194 195 return 0; 196 } 197