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 | */ |
| 15 | |
| 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 | */ |
| 74 | pad_config_reg = (uint32_t *)(COMMUNITY_BASE(community) + 0x4400 + |
| 75 | (0x400 * (fpad >> 8)) + (8 * (fpad & 0xff))); |
| 76 | |
| 77 | return pad_config_reg; |
| 78 | } |
| 79 | |
| 80 | int get_gpio(int community_base, int pad0_offset) |
| 81 | { |
| 82 | return (read32((void *)(community_base + pad0_offset))) & PAD_RX_BIT; |
| 83 | } |