Lee Leahy | 3247172 | 2015-04-20 15:20:28 -0700 | [diff] [blame] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2015 Intel Corp. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 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. |
Lee Leahy | 3247172 | 2015-04-20 15:20:28 -0700 | [diff] [blame] | 14 | */ |
Subrata Banik | ed7275f | 2015-08-22 10:36:41 +0530 | [diff] [blame] | 15 | #include <gpio.h> |
Lee Leahy | 3247172 | 2015-04-20 15:20:28 -0700 | [diff] [blame] | 16 | #include <console/console.h> |
| 17 | #include <soc/gpio.h> |
| 18 | |
| 19 | /* |
| 20 | * Return family number and internal pad number in that community by pad number |
| 21 | * and which community it is in. |
| 22 | */ |
| 23 | uint16_t gpio_family_number(uint8_t community, uint8_t pad) |
| 24 | { |
| 25 | /* |
| 26 | * Refer to BSW BIOS Writers Guide, Table "Family Number". |
| 27 | * BSW has 4 GPIO communities. Each community has up to 7 families and |
| 28 | * each family contains a range of Pad numbers. The number in the array |
| 29 | * is the maximum no. of that range. |
| 30 | * For example: East community, family 0, Pad 0~11. |
| 31 | */ |
| 32 | static const uint8_t community_base[GPIO_COMMUNITY_COUNT] |
| 33 | [GPIO_FAMILIES_MAX_PER_COMM + 1] = { |
| 34 | {0, 8, 16, 24, 32, 40, 48, 56}, /* Southwest */ |
| 35 | {0, 9, 22, 34, 46, 59, 59, 59}, /* North */ |
| 36 | {0, 12, 24, 24, 24, 24, 24, 24}, /* East */ |
| 37 | {0, 8, 20, 26, 34, 44, 55, 55} /* Southeast */ |
| 38 | }; |
| 39 | const uint8_t *base; |
| 40 | uint8_t i; |
| 41 | |
| 42 | /* Validate the pad number */ |
| 43 | if (pad > community_base[community][7]) |
| 44 | die("Pad number is out of range!"); |
| 45 | |
| 46 | /* Locate the family number for the pad */ |
| 47 | base = &community_base[community][0]; |
| 48 | for (i = 0; i < 7; i++) { |
| 49 | if ((pad >= base[0]) && (pad < base[1])) |
| 50 | break; |
| 51 | base++; |
| 52 | } |
| 53 | |
| 54 | /* Family number in high byte and inner pad number in lowest byte */ |
| 55 | return (i << 8) + pad - *base; |
| 56 | } |
| 57 | |
| 58 | /* |
| 59 | * Return pad configuration register offset by pad number and which community |
| 60 | * it is in. |
| 61 | */ |
| 62 | uint32_t *gpio_pad_config_reg(uint8_t community, uint8_t pad) |
| 63 | { |
| 64 | uint16_t fpad; |
| 65 | uint32_t *pad_config_reg; |
| 66 | |
| 67 | /* Get the GPIO family number */ |
| 68 | fpad = gpio_family_number(community, pad); |
| 69 | |
| 70 | /* |
| 71 | * Refer to BSW BIOS Writers Guide, Table "Per Pad Memory Space |
| 72 | * Registers Addresses" for the Pad configuration register calculation. |
| 73 | */ |
Subrata Banik | ed7275f | 2015-08-22 10:36:41 +0530 | [diff] [blame] | 74 | pad_config_reg = (uint32_t *)(COMMUNITY_BASE(community) |
| 75 | + FAMILY_PAD_REGS_OFF + (FAMILY_PAD_REGS_SIZE * (fpad >> 8)) |
| 76 | + (GPIO_REGS_SIZE * (fpad & 0xff))); |
Lee Leahy | 3247172 | 2015-04-20 15:20:28 -0700 | [diff] [blame] | 77 | |
| 78 | return pad_config_reg; |
| 79 | } |
| 80 | |
Subrata Banik | ed7275f | 2015-08-22 10:36:41 +0530 | [diff] [blame] | 81 | static int gpio_get_community_num(gpio_t gpio_num, int *pad) |
| 82 | { |
| 83 | int comm = 0; |
| 84 | |
| 85 | if (gpio_num >= GP_SW_00 && gpio_num <= GP_SW_97) { |
| 86 | comm = GP_SOUTHWEST; |
| 87 | *pad = gpio_num % GP_SOUTHWEST_COUNT; |
| 88 | } else if (gpio_num >= GP_NC_00 && gpio_num <= GP_NC_72) { |
| 89 | comm = GP_NORTH; |
| 90 | *pad = gpio_num % GP_SOUTHWEST_COUNT; |
| 91 | } else if (gpio_num >= GP_E_00 && gpio_num <= GP_E_26) { |
| 92 | comm = GP_EAST; |
| 93 | *pad = gpio_num % |
| 94 | (GP_SOUTHWEST_COUNT + GP_NORTH_COUNT); |
| 95 | } else { |
| 96 | comm = GP_SOUTHEAST; |
| 97 | *pad = gpio_num % (GP_SOUTHWEST_COUNT + |
| 98 | GP_NORTH_COUNT + GP_EAST_COUNT); |
| 99 | } |
| 100 | return comm; |
| 101 | } |
| 102 | |
| 103 | static void gpio_config_pad(gpio_t gpio_num, const struct soc_gpio_map *cfg) |
| 104 | { |
| 105 | int comm = 0; |
| 106 | int pad_num =0; |
| 107 | uint32_t *pad_config0_reg; |
| 108 | uint32_t *pad_config1_reg; |
| 109 | int max_gpio_cnt = GP_SOUTHWEST_COUNT + GP_NORTH_COUNT + GP_EAST_COUNT |
| 110 | + GP_SOUTHEAST_COUNT; |
| 111 | |
| 112 | if(gpio_num > max_gpio_cnt) |
| 113 | return; |
| 114 | /* Get GPIO Community based on GPIO_NUMBER */ |
| 115 | comm = gpio_get_community_num(gpio_num, &pad_num); |
| 116 | /* CONF0 */ |
| 117 | pad_config0_reg = gpio_pad_config_reg(comm, pad_num); |
| 118 | /* CONF1 */ |
| 119 | pad_config1_reg = pad_config0_reg + 1; |
| 120 | |
| 121 | write32(pad_config0_reg, cfg->pad_conf0); |
| 122 | write32(pad_config1_reg, cfg->pad_conf1); |
| 123 | } |
| 124 | |
| 125 | void gpio_input_pullup(gpio_t gpio_num) |
| 126 | { |
| 127 | struct soc_gpio_map cfg = GPIO_INPUT_PU_20K; |
| 128 | gpio_config_pad(gpio_num, &cfg); |
| 129 | } |
| 130 | |
| 131 | void gpio_input_pulldown(gpio_t gpio_num) |
| 132 | { |
| 133 | struct soc_gpio_map cfg = GPIO_INPUT_PD_20K; |
| 134 | gpio_config_pad(gpio_num, &cfg); |
| 135 | } |
| 136 | |
| 137 | void gpio_input(gpio_t gpio_num) |
| 138 | { |
| 139 | struct soc_gpio_map cfg = GPIO_INPUT_NO_PULL; |
| 140 | gpio_config_pad(gpio_num, &cfg); |
| 141 | } |
| 142 | |
| 143 | int gpio_get(gpio_t gpio_num) |
| 144 | { |
| 145 | int comm = 0; |
| 146 | int pad_num =0; |
| 147 | uint32_t *pad_config0_reg; |
| 148 | u32 pad_value; |
| 149 | int max_gpio_cnt = GP_SOUTHWEST_COUNT + GP_NORTH_COUNT + GP_EAST_COUNT |
| 150 | + GP_SOUTHEAST_COUNT; |
| 151 | |
| 152 | if(gpio_num > max_gpio_cnt) |
| 153 | return -1; |
| 154 | |
| 155 | /* Get GPIO Community based on GPIO_NUMBER */ |
| 156 | comm = gpio_get_community_num(gpio_num, &pad_num); |
| 157 | /* CONF0 */ |
| 158 | pad_config0_reg = gpio_pad_config_reg(comm, pad_num); |
| 159 | |
| 160 | pad_value = read32(pad_config0_reg); |
| 161 | |
| 162 | return pad_value & PAD_RX_BIT; |
| 163 | } |
| 164 | |
Lee Leahy | 3247172 | 2015-04-20 15:20:28 -0700 | [diff] [blame] | 165 | int get_gpio(int community_base, int pad0_offset) |
| 166 | { |
| 167 | return (read32((void *)(community_base + pad0_offset))) & PAD_RX_BIT; |
| 168 | } |