diff options
Diffstat (limited to 'src/soc/intel/braswell/gpio_support.c')
-rw-r--r-- | src/soc/intel/braswell/gpio_support.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/src/soc/intel/braswell/gpio_support.c b/src/soc/intel/braswell/gpio_support.c new file mode 100644 index 0000000000..7be1914bd0 --- /dev/null +++ b/src/soc/intel/braswell/gpio_support.c @@ -0,0 +1,87 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2015 Intel Corp. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc. + */ + +#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) + 0x4400 + + (0x400 * (fpad >> 8)) + (8 * (fpad & 0xff))); + + return pad_config_reg; +} + +int get_gpio(int community_base, int pad0_offset) +{ + return (read32((void *)(community_base + pad0_offset))) & PAD_RX_BIT; +} |