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drivers/tpm/cr50: Add I2C bus support to cr50 driver

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This allows mainboards using an I2C bus to communicate with the cr50
to reuse the functionality related to firmware version and BOARD_CFG.

BUG=b:202246591
TEST=boot on brya0, see cr50 FW version in logs

Change-Id: Ide1a7299936193da3cd3d15fdfd1a80994d70da0
Signed-off-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62059
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Tim Wawrzynczak
2022-02-16 13:48:07 -07:00
parent 6b8599f29a
commit 1e50dfbcde
2 changed files with 37 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
src/drivers/tpm/cr50.c
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@@ -23,6 +23,9 @@ enum cr50_register {
#define CR50_FW_VER_REG_SPI (TPM_LOCALITY_0_SPI_BASE + 0xf90)
#define CR50_BOARD_CFG_REG_SPI (TPM_LOCALITY_0_SPI_BASE + 0xfe0)
#define CR50_FW_VER_REG_I2C 0x0f
#define CR50_BOARD_CFG_REG_I2C 0x1c
/* Return register address, which depends on the bus type, or -1 for error. */
static int get_reg_addr(enum cr50_register reg)
{
@@ -37,6 +40,16 @@ static int get_reg_addr(enum cr50_register reg)
}
}
if (CONFIG(I2C_TPM)) {
switch (reg) {
case CR50_FW_VER_REG:
return CR50_FW_VER_REG_I2C;
case CR50_BOARD_CFG_REG:
return CR50_BOARD_CFG_REG_I2C;
default:
return -1;
}
}
return -1;
}