architecture/riscv64/package/u-boot/0006-board-sifive-Add-an-interface-to-get-PCB-revision.patch

   1 From cdecb59564d7b2f2f0a53a41e6933f63badb2def Mon Sep 17 00:00:00 2001
   2 From: Zong Li <zong.li@sifive.com>
   3 Date: Wed, 30 Jun 2021 23:23:48 +0800
   4 Subject: [PATCH 06/16] board: sifive: Add an interface to get PCB revision
   5
   6 There are different DDR parameter settings for different board
   7 revisions. Add a new interface to get the PCB revision to determine
   8 which DT should be selected at runtime.
   9
  10 Signed-off-by: Zong Li <zong.li@sifive.com>
  11 Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
  12 ---
  13  arch/riscv/include/asm/arch-fu740/eeprom.h         | 15 ++++++++++
  14  .../sifive/unmatched/hifive-platform-i2c-eeprom.c  | 32 ++++++++++++++++++++++
  15  2 files changed, 47 insertions(+)
  16  create mode 100644 arch/riscv/include/asm/arch-fu740/eeprom.h
  17
  18 diff --git a/arch/riscv/include/asm/arch-fu740/eeprom.h b/arch/riscv/include/asm/arch-fu740/eeprom.h
  19 new file mode 100644
  20 index 0000000..0e1220e
  21 --- /dev/null
  22 +++ b/arch/riscv/include/asm/arch-fu740/eeprom.h
  23 @@ -0,0 +1,15 @@
  24 +/* SPDX-License-Identifier: GPL-2.0 */
  25 +/*
  26 + * Copyright (C) 2021 SiFive, Inc.
  27 + *
  28 + * Zong Li <zong.li@sifve.com>
  29 + */
  30 +
  31 +#ifndef _ASM_RISCV_EEPROM_H
  32 +#define _ASM_RISCV_EEPROM_H
  33 +
  34 +#define PCB_REVISION_REV3      0x3
  35 +
  36 +u8 get_pcb_revision_from_eeprom(void);
  37 +
  38 +#endif /* _ASM_RISCV_EEPROM_H */
  39 diff --git a/board/sifive/unmatched/hifive-platform-i2c-eeprom.c b/board/sifive/unmatched/hifive-platform-i2c-eeprom.c
  40 index 9a62d32..a2151f1 100644
  41 --- a/board/sifive/unmatched/hifive-platform-i2c-eeprom.c
  42 +++ b/board/sifive/unmatched/hifive-platform-i2c-eeprom.c
  43 @@ -540,3 +540,35 @@ int mac_read_from_eeprom(void)
  44
  45         return 0;
  46  }
  47 +
  48 +/**
  49 + * get_pcb_revision_from_eeprom - get the PCB revision
  50 + *
  51 + * Read the EEPROM to determine the board revision.
  52 + *
  53 + * This function is called before relocation, so we need to read a private
  54 + * copy of the EEPROM into a local variable on the stack.
  55 + */
  56 +u8 get_pcb_revision_from_eeprom(void)
  57 +{
  58 +       struct __attribute__ ((__packed__)) board_eeprom {
  59 +               u8 magic[MAGIC_NUMBER_BYTES];
  60 +               u8 format_ver;
  61 +               u16 product_id;
  62 +               u8 pcb_revision;
  63 +       } be;
  64 +
  65 +       int ret;
  66 +       struct udevice *dev;
  67 +
  68 +       ret = i2c_get_chip_for_busnum(CONFIG_SYS_EEPROM_BUS_NUM,
  69 +                                     CONFIG_SYS_I2C_EEPROM_ADDR,
  70 +                                     1,
  71 +                                     &dev);
  72 +
  73 +       if (!ret)
  74 +               dm_i2c_read(dev, 0, (void *)&be,
  75 +                           sizeof(struct board_eeprom));
  76 +
  77 +       return be.pcb_revision;
  78 +}
  79 --
  80 2.7.4
  81