| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <device/pci_ops.h> |
| #include <console/console.h> |
| #include <device/smbus_host.h> |
| #include "variants/baseboard/include/eeprom.h" |
| |
| /* |
| * Check Signature in EEPROM (M24C32-FMN6TP) |
| * If signature is there we assume that that the content is valid |
| */ |
| int check_signature(u8 addr) |
| { |
| u8 blob[8] = {0}; |
| |
| if (!read_write_config(addr, blob, EEPROM_OFFSET_FSP_SIGNATURE, 0, ARRAY_SIZE(blob))) { |
| /* Check signature */ |
| if (*(uint64_t *)blob == FSP_UPD_SIGNATURE) { |
| printk(BIOS_DEBUG, "CFG EEPROM: Signature valid.\n"); |
| return 1; |
| } |
| printk(BIOS_DEBUG, "CFG EEPROM: Signature invalid - skipping option write.\n"); |
| return 0; |
| } |
| return 0; |
| } |
| |
| /* Read data from offset and write it to offset in UPD */ |
| bool read_write_config(u8 addr, void *blob, size_t read_offset, size_t write_offset, |
| size_t size) |
| { |
| int ret = 0; |
| |
| u32 smb_ctrl_reg = pci_read_config32(PCH_DEV_SMBUS, HOSTC); |
| pci_write_config32(PCH_DEV_SMBUS, HOSTC, smb_ctrl_reg | HOSTC_I2C_EN); |
| |
| printk(BIOS_SPEW, "%s\tOffset: %04zx\tSize: %02zx\n", __func__, |
| read_offset, size); |
| |
| /* We can always read two bytes at a time */ |
| for (size_t i = 0; i < size; i = i + 2) { |
| u8 tmp[2] = {0}; |
| |
| ret = do_smbus_process_call(SMBUS_IO_BASE, addr, 0, |
| swab16(read_offset + i), (uint16_t *)&tmp[0]); |
| if (ret < 0) |
| break; |
| |
| /* Write to UPD */ |
| uint8_t *writePointer = (uint8_t *)blob + write_offset + i; |
| if (size > 1 && (size % 2 == 0)) |
| memcpy(writePointer, tmp, 2); |
| else |
| *writePointer = tmp[0]; |
| } |
| |
| /* Restore I2C_EN bit */ |
| pci_write_config32(PCH_DEV_SMBUS, HOSTC, smb_ctrl_reg); |
| |
| return ret; |
| } |