Angel Pons | 1ddb894 | 2020-04-04 18:51:26 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 2 | |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 3 | #include <assert.h> |
Julius Werner | 80af442 | 2014-10-20 13:18:56 -0700 | [diff] [blame] | 4 | #include <console/console.h> |
Kyösti Mälkki | 13f6650 | 2019-03-03 08:01:05 +0200 | [diff] [blame] | 5 | #include <device/mmio.h> |
Julius Werner | 80af442 | 2014-10-20 13:18:56 -0700 | [diff] [blame] | 6 | #include <delay.h> |
| 7 | #include <soc/cpu.h> |
| 8 | #include <soc/gpio.h> |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 9 | |
| 10 | #define CON_MASK(x) (0xf << ((x) << 2)) |
| 11 | #define CON_SFR(x, v) ((v) << ((x) << 2)) |
| 12 | |
| 13 | #define DAT_MASK(x) (0x1 << (x)) |
| 14 | #define DAT_SET(x) (0x1 << (x)) |
| 15 | |
| 16 | #define PULL_MASK(x) (0x3 << ((x) << 1)) |
| 17 | #define PULL_MODE(x, v) ((v) << ((x) << 1)) |
| 18 | |
| 19 | #define DRV_MASK(x) (0x3 << ((x) << 1)) |
| 20 | #define DRV_SET(x, m) ((m) << ((x) << 1)) |
| 21 | #define RATE_MASK(x) (0x1 << (x + 16)) |
| 22 | #define RATE_SET(x) (0x1 << (x + 16)) |
| 23 | |
| 24 | struct gpio_info { |
| 25 | unsigned int reg_addr; /* Address of register for this part */ |
| 26 | unsigned int max_gpio; /* Maximum GPIO in this part */ |
| 27 | }; |
| 28 | |
| 29 | static const struct gpio_info gpio_data[EXYNOS_GPIO_NUM_PARTS] = { |
Julius Werner | fa938c7 | 2013-08-29 14:17:36 -0700 | [diff] [blame] | 30 | { EXYNOS5420_GPIO_PART1_BASE, GPIO_MAX_PORT_PART_1 }, |
| 31 | { EXYNOS5420_GPIO_PART2_BASE, GPIO_MAX_PORT_PART_2 }, |
| 32 | { EXYNOS5420_GPIO_PART3_BASE, GPIO_MAX_PORT_PART_3 }, |
| 33 | { EXYNOS5420_GPIO_PART4_BASE, GPIO_MAX_PORT_PART_4 }, |
| 34 | { EXYNOS5420_GPIO_PART5_BASE, GPIO_MAX_PORT_PART_5 }, |
| 35 | { EXYNOS5420_GPIO_PART6_BASE, GPIO_MAX_PORT }, |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 36 | }; |
| 37 | |
| 38 | /* This macro gets gpio pin offset from 0..7 */ |
| 39 | #define GPIO_BIT(x) ((x) & 0x7) |
| 40 | |
| 41 | static struct gpio_bank *gpio_get_bank(unsigned int gpio) |
| 42 | { |
| 43 | const struct gpio_info *data; |
| 44 | unsigned int upto; |
| 45 | int i; |
| 46 | |
| 47 | for (i = upto = 0, data = gpio_data; i < EXYNOS_GPIO_NUM_PARTS; |
| 48 | i++, upto = data->max_gpio, data++) { |
| 49 | if (gpio < data->max_gpio) { |
| 50 | struct gpio_bank *bank; |
| 51 | |
| 52 | bank = (struct gpio_bank *)data->reg_addr; |
| 53 | bank += (gpio - upto) / GPIO_PER_BANK; |
| 54 | return bank; |
| 55 | } |
| 56 | } |
| 57 | |
| 58 | ASSERT(gpio < GPIO_MAX_PORT); /* ...which it will not be */ |
| 59 | return NULL; |
| 60 | } |
| 61 | |
| 62 | /* Common GPIO API - only available on Exynos5 */ |
| 63 | void gpio_cfg_pin(int gpio, int cfg) |
| 64 | { |
| 65 | unsigned int value; |
| 66 | struct gpio_bank *bank = gpio_get_bank(gpio); |
| 67 | |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 68 | value = read32(&bank->con); |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 69 | value &= ~CON_MASK(GPIO_BIT(gpio)); |
| 70 | value |= CON_SFR(GPIO_BIT(gpio), cfg); |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 71 | write32(&bank->con, value); |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 72 | } |
| 73 | |
| 74 | static int gpio_get_cfg(int gpio) |
| 75 | { |
| 76 | struct gpio_bank *bank = gpio_get_bank(gpio); |
| 77 | int shift = GPIO_BIT(gpio) << 2; |
| 78 | |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 79 | return (read32(&bank->con) & CON_MASK(GPIO_BIT(gpio))) >> shift; |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | void gpio_set_pull(int gpio, int mode) |
| 83 | { |
| 84 | unsigned int value; |
| 85 | struct gpio_bank *bank = gpio_get_bank(gpio); |
| 86 | |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 87 | value = read32(&bank->pull); |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 88 | value &= ~PULL_MASK(GPIO_BIT(gpio)); |
| 89 | |
| 90 | switch (mode) { |
| 91 | case GPIO_PULL_DOWN: |
| 92 | case GPIO_PULL_UP: |
| 93 | value |= PULL_MODE(GPIO_BIT(gpio), mode); |
| 94 | break; |
| 95 | default: |
| 96 | break; |
| 97 | } |
| 98 | |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 99 | write32(&bank->pull, value); |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 100 | } |
| 101 | |
| 102 | void gpio_set_drv(int gpio, int mode) |
| 103 | { |
| 104 | unsigned int value; |
| 105 | struct gpio_bank *bank = gpio_get_bank(gpio); |
| 106 | |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 107 | value = read32(&bank->drv); |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 108 | value &= ~DRV_MASK(GPIO_BIT(gpio)); |
| 109 | |
| 110 | switch (mode) { |
| 111 | case GPIO_DRV_1X: |
| 112 | case GPIO_DRV_2X: |
| 113 | case GPIO_DRV_3X: |
| 114 | case GPIO_DRV_4X: |
| 115 | value |= DRV_SET(GPIO_BIT(gpio), mode); |
| 116 | break; |
| 117 | default: |
| 118 | return; |
| 119 | } |
| 120 | |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 121 | write32(&bank->drv, value); |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 122 | } |
| 123 | |
| 124 | void gpio_set_rate(int gpio, int mode) |
| 125 | { |
| 126 | unsigned int value; |
| 127 | struct gpio_bank *bank = gpio_get_bank(gpio); |
| 128 | |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 129 | value = read32(&bank->drv); |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 130 | value &= ~RATE_MASK(GPIO_BIT(gpio)); |
| 131 | |
| 132 | switch (mode) { |
| 133 | case GPIO_DRV_FAST: |
| 134 | case GPIO_DRV_SLOW: |
| 135 | value |= RATE_SET(GPIO_BIT(gpio)); |
| 136 | break; |
| 137 | default: |
| 138 | return; |
| 139 | } |
| 140 | |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 141 | write32(&bank->drv, value); |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 142 | } |
| 143 | |
Martin Roth | 57e8909 | 2019-10-23 21:45:23 -0600 | [diff] [blame] | 144 | int gpio_direction_input(unsigned int gpio) |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 145 | { |
| 146 | gpio_cfg_pin(gpio, GPIO_INPUT); |
| 147 | |
| 148 | return 0; |
| 149 | } |
| 150 | |
Martin Roth | 57e8909 | 2019-10-23 21:45:23 -0600 | [diff] [blame] | 151 | int gpio_direction_output(unsigned int gpio, int value) |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 152 | { |
| 153 | unsigned int val; |
| 154 | struct gpio_bank *bank = gpio_get_bank(gpio); |
| 155 | |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 156 | val = read32(&bank->dat); |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 157 | val &= ~DAT_MASK(GPIO_BIT(gpio)); |
| 158 | if (value) |
| 159 | val |= DAT_SET(GPIO_BIT(gpio)); |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 160 | write32(&bank->dat, val); |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 161 | |
Ronald G. Minnich | 3245056 | 2013-06-18 13:02:23 -0700 | [diff] [blame] | 162 | gpio_cfg_pin(gpio, GPIO_OUTPUT); |
| 163 | |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 164 | return 0; |
| 165 | } |
| 166 | |
Martin Roth | 57e8909 | 2019-10-23 21:45:23 -0600 | [diff] [blame] | 167 | int gpio_get_value(unsigned int gpio) |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 168 | { |
| 169 | unsigned int value; |
| 170 | struct gpio_bank *bank = gpio_get_bank(gpio); |
| 171 | |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 172 | value = read32(&bank->dat); |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 173 | return !!(value & DAT_MASK(GPIO_BIT(gpio))); |
| 174 | } |
| 175 | |
Martin Roth | 57e8909 | 2019-10-23 21:45:23 -0600 | [diff] [blame] | 176 | int gpio_set_value(unsigned int gpio, int value) |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 177 | { |
| 178 | unsigned int val; |
| 179 | struct gpio_bank *bank = gpio_get_bank(gpio); |
| 180 | |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 181 | val = read32(&bank->dat); |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 182 | val &= ~DAT_MASK(GPIO_BIT(gpio)); |
| 183 | if (value) |
| 184 | val |= DAT_SET(GPIO_BIT(gpio)); |
Julius Werner | 2f37bd6 | 2015-02-19 14:51:15 -0800 | [diff] [blame] | 185 | write32(&bank->dat, val); |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 186 | |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | /* |
| 191 | * Add a delay here to give the lines time to settle |
David Hendricks | b774313 | 2013-08-09 18:19:29 -0700 | [diff] [blame] | 192 | * TODO(dianders): 5us does not always work, 10 is stable, so use 15 to be safe |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 193 | * Come back to this and sort out what the datasheet says |
| 194 | */ |
David Hendricks | b774313 | 2013-08-09 18:19:29 -0700 | [diff] [blame] | 195 | #define GPIO_DELAY_US 15 |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 196 | |
Martin Roth | 57e8909 | 2019-10-23 21:45:23 -0600 | [diff] [blame] | 197 | int gpio_read_mvl3(unsigned int gpio) |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 198 | { |
| 199 | int high, low; |
| 200 | enum mvl3 value; |
| 201 | |
| 202 | if (gpio >= GPIO_MAX_PORT) |
| 203 | return -1; |
| 204 | |
| 205 | gpio_direction_input(gpio); |
| 206 | gpio_set_pull(gpio, GPIO_PULL_UP); |
| 207 | udelay(GPIO_DELAY_US); |
| 208 | high = gpio_get_value(gpio); |
| 209 | gpio_set_pull(gpio, GPIO_PULL_DOWN); |
| 210 | udelay(GPIO_DELAY_US); |
| 211 | low = gpio_get_value(gpio); |
| 212 | |
| 213 | if (high && low) /* external pullup */ |
| 214 | value = LOGIC_1; |
| 215 | else if (!high && !low) /* external pulldown */ |
| 216 | value = LOGIC_0; |
| 217 | else /* floating */ |
| 218 | value = LOGIC_Z; |
| 219 | |
| 220 | /* |
| 221 | * Check if line is externally pulled high and |
| 222 | * configure the internal pullup to match. For |
| 223 | * floating and pulldowns, the GPIO is already |
| 224 | * configured with an internal pulldown from the |
| 225 | * above test. |
| 226 | */ |
| 227 | if (value == LOGIC_1) |
| 228 | gpio_set_pull(gpio, GPIO_PULL_UP); |
| 229 | |
| 230 | return value; |
| 231 | } |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 232 | |
| 233 | /* |
| 234 | * Display Exynos GPIO information |
| 235 | */ |
| 236 | void gpio_info(void) |
| 237 | { |
Martin Roth | 57e8909 | 2019-10-23 21:45:23 -0600 | [diff] [blame] | 238 | unsigned int gpio; |
Gabe Black | 607c0b6 | 2013-05-16 05:45:57 -0700 | [diff] [blame] | 239 | |
| 240 | for (gpio = 0; gpio < GPIO_MAX_PORT; gpio++) { |
| 241 | int cfg = gpio_get_cfg(gpio); |
| 242 | |
| 243 | printk(BIOS_INFO, "GPIO_%-3d: ", gpio); |
| 244 | if (cfg == GPIO_INPUT) |
| 245 | printk(BIOS_INFO, "input"); |
| 246 | else if (cfg == GPIO_OUTPUT) |
| 247 | printk(BIOS_INFO, "output"); |
| 248 | else |
| 249 | printk(BIOS_INFO, "func %d", cfg); |
| 250 | |
| 251 | if (cfg == GPIO_INPUT || cfg == GPIO_OUTPUT) |
| 252 | printk(BIOS_INFO, ", value = %d", gpio_get_value(gpio)); |
| 253 | printk(BIOS_INFO, "\n"); |
| 254 | } |
| 255 | } |