| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <device/mmio.h> |
| #include <gpio.h> |
| #include <console/console.h> |
| #include <soc/gpio.h> |
| |
| /* |
| * Return family number and internal pad number in that community by pad number |
| * and which community it is in. |
| */ |
| uint16_t gpio_family_number(uint8_t community, uint8_t pad) |
| { |
| /* |
| * Refer to BSW BIOS Writers Guide, Table "Family Number". BSW has 4 GPIO communities. |
| * Each community has up to 7 families and each family contains a range of Pad numbers. |
| * The number in the array is the maximum no. of that range. |
| * For example: East community, family 0, Pad 0~11. |
| */ |
| static const uint8_t community_base[GPIO_COMMUNITY_COUNT] |
| [GPIO_FAMILIES_MAX_PER_COMM + 1] = { |
| {0, 8, 16, 24, 32, 40, 48, 56}, /* Southwest */ |
| {0, 9, 22, 34, 46, 59, 59, 59}, /* North */ |
| {0, 12, 24, 24, 24, 24, 24, 24}, /* East */ |
| {0, 8, 20, 26, 34, 44, 55, 55} /* Southeast */ |
| }; |
| const uint8_t *base; |
| uint8_t i; |
| |
| /* Validate the pad number */ |
| if (pad > community_base[community][7]) |
| die("Pad number is out of range!"); |
| |
| /* Locate the family number for the pad */ |
| base = &community_base[community][0]; |
| for (i = 0; i < 7; i++) { |
| if ((pad >= base[0]) && (pad < base[1])) |
| break; |
| base++; |
| } |
| |
| /* Family number in high byte and inner pad number in lowest byte */ |
| return (i << 8) + pad - *base; |
| } |
| |
| /* |
| * Return pad configuration register offset by pad number and which community it is in. |
| */ |
| uint32_t *gpio_pad_config_reg(uint8_t community, uint8_t pad) |
| { |
| uint16_t fpad; |
| uint32_t *pad_config_reg; |
| |
| /* Get the GPIO family number */ |
| fpad = gpio_family_number(community, pad); |
| |
| /* |
| * Refer to BSW BIOS Writers Guide, Table "Per Pad Memory Space Registers Addresses" |
| * for the Pad configuration register calculation. |
| */ |
| pad_config_reg = (uint32_t *)(COMMUNITY_BASE(community) + FAMILY_PAD_REGS_OFF + |
| (FAMILY_PAD_REGS_SIZE * (fpad >> 8)) + (GPIO_REGS_SIZE * (fpad & 0xff))); |
| |
| return pad_config_reg; |
| } |
| |
| static int gpio_get_community_num(gpio_t gpio_num, int *pad) |
| { |
| int comm = 0; |
| |
| if (gpio_num >= GP_SW_00 && gpio_num <= GP_SW_97) { |
| comm = GP_SOUTHWEST; |
| *pad = gpio_num % GP_SOUTHWEST_COUNT; |
| |
| } else if (gpio_num >= GP_NC_00 && gpio_num <= GP_NC_72) { |
| comm = GP_NORTH; |
| *pad = gpio_num % GP_SOUTHWEST_COUNT; |
| |
| } else if (gpio_num >= GP_E_00 && gpio_num <= GP_E_26) { |
| comm = GP_EAST; |
| *pad = gpio_num % (GP_SOUTHWEST_COUNT + GP_NORTH_COUNT); |
| |
| } else { |
| comm = GP_SOUTHEAST; |
| *pad = gpio_num % (GP_SOUTHWEST_COUNT + GP_NORTH_COUNT + GP_EAST_COUNT); |
| } |
| return comm; |
| } |
| |
| static void gpio_config_pad(gpio_t gpio_num, const struct soc_gpio_map *cfg) |
| { |
| int comm = 0; |
| int pad_num = 0; |
| uint32_t *pad_config0_reg; |
| uint32_t *pad_config1_reg; |
| |
| if (gpio_num > MAX_GPIO_CNT) |
| return; |
| /* Get GPIO Community based on GPIO_NUMBER */ |
| comm = gpio_get_community_num(gpio_num, &pad_num); |
| /* CONF0 */ |
| pad_config0_reg = gpio_pad_config_reg(comm, pad_num); |
| /* CONF1 */ |
| pad_config1_reg = pad_config0_reg + 1; |
| |
| write32(pad_config0_reg, cfg->pad_conf0); |
| write32(pad_config1_reg, cfg->pad_conf1); |
| } |
| |
| void gpio_input_pullup(gpio_t gpio_num) |
| { |
| struct soc_gpio_map cfg = GPIO_INPUT_PU_20K; |
| gpio_config_pad(gpio_num, &cfg); |
| } |
| |
| void gpio_input_pulldown(gpio_t gpio_num) |
| { |
| struct soc_gpio_map cfg = GPIO_INPUT_PD_20K; |
| gpio_config_pad(gpio_num, &cfg); |
| } |
| |
| void gpio_input(gpio_t gpio_num) |
| { |
| struct soc_gpio_map cfg = GPIO_INPUT_NO_PULL; |
| gpio_config_pad(gpio_num, &cfg); |
| } |
| |
| int gpio_get(gpio_t gpio_num) |
| { |
| int comm = 0; |
| int pad_num = 0; |
| uint32_t *pad_config0_reg; |
| u32 pad_value; |
| |
| if (gpio_num > MAX_GPIO_CNT) |
| return -1; |
| |
| /* Get GPIO Community based on GPIO_NUMBER */ |
| comm = gpio_get_community_num(gpio_num, &pad_num); |
| /* CONF0 */ |
| pad_config0_reg = gpio_pad_config_reg(comm, pad_num); |
| |
| pad_value = read32(pad_config0_reg); |
| |
| return pad_value & PAD_RX_BIT; |
| } |
| |
| int get_gpio(int community_base, int pad0_offset) |
| { |
| return (read32((void *)(community_base + pad0_offset))) & PAD_RX_BIT; |
| } |