diff options
| -rw-r--r-- | arch/riscv/include/asm/arch-fu740/eeprom.h | 15 | ||||
| -rw-r--r-- | board/sifive/unmatched/hifive-platform-i2c-eeprom.c | 32 |
2 files changed, 47 insertions, 0 deletions
diff --git a/arch/riscv/include/asm/arch-fu740/eeprom.h b/arch/riscv/include/asm/arch-fu740/eeprom.h new file mode 100644 index 0000000000..0e1220e558 --- /dev/null +++ b/arch/riscv/include/asm/arch-fu740/eeprom.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2021 SiFive, Inc. + * + * Zong Li <zong.li@sifve.com> + */ + +#ifndef _ASM_RISCV_EEPROM_H +#define _ASM_RISCV_EEPROM_H + +#define PCB_REVISION_REV3 0x3 + +u8 get_pcb_revision_from_eeprom(void); + +#endif /* _ASM_RISCV_EEPROM_H */ diff --git a/board/sifive/unmatched/hifive-platform-i2c-eeprom.c b/board/sifive/unmatched/hifive-platform-i2c-eeprom.c index 9a62d32453..a2151f15e0 100644 --- a/board/sifive/unmatched/hifive-platform-i2c-eeprom.c +++ b/board/sifive/unmatched/hifive-platform-i2c-eeprom.c @@ -540,3 +540,35 @@ int mac_read_from_eeprom(void) return 0; } + +/** + * get_pcb_revision_from_eeprom - get the PCB revision + * + * Read the EEPROM to determine the board revision. + * + * This function is called before relocation, so we need to read a private + * copy of the EEPROM into a local variable on the stack. + */ +u8 get_pcb_revision_from_eeprom(void) +{ + struct __attribute__ ((__packed__)) board_eeprom { + u8 magic[MAGIC_NUMBER_BYTES]; + u8 format_ver; + u16 product_id; + u8 pcb_revision; + } be; + + int ret; + struct udevice *dev; + + ret = i2c_get_chip_for_busnum(CONFIG_SYS_EEPROM_BUS_NUM, + CONFIG_SYS_I2C_EEPROM_ADDR, + 1, + &dev); + + if (!ret) + dm_i2c_read(dev, 0, (void *)&be, + sizeof(struct board_eeprom)); + + return be.pcb_revision; +} |