platform/x86: mlx-platform: Add BIOS attributes for CoffeeLake COMEx based systems

Extend systems of class VMOD0010 equipped with CoffeeLake COMEx module
with BIOS related attributes to represent various BIOS statuses.
These attributes "bios_active_image", "bios_auth_fail",
"bios_upgrade_fail", "bios_safe_mode" has been already added to modular
system. This all of them are already documented.
- "bios_active_image" - location of current active BIOS image (0: Top,
  1: Bottom. The reported value should correspond to value expected by
  OS in case of BIOS safe mode is 0. This bit is related to Intel
  top-swap feature of DualBios on the same flash.
- "bios_auth_fail": BIOS upgrade is failed because provided BIOS image
  is not signed correctly.
- "bios_upgrade_fail" BIOS upgrade is failed by some reason not related
  to authentication. For example, due to physical SPI flash problem.
- "bios_safe_mod": - 0 : if BIOS is booted from a supposed active image;
  1 : BIOS safe mechanism was enforced by hardware (CPLD).

Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Reviewed-by: Oleksandr Shamray <oleksandrs@nvidia.com>
Link: https://lore.kernel.org/r/20211023094022.4193813-3-vadimp@nvidia.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

diff --git a/drivers/platform/x86/mlx-platform.c b/drivers/platform/x86/mlx-platform.c
index 06fe58aaa23b0302e6b6467888fb3d55f8974093..3d017e889ce59cbe410cd6eb64de64a61b10d7d0 100644 (file)
--- a/drivers/platform/x86/mlx-platform.c
+++ b/drivers/platform/x86/mlx-platform.c
@@ -2917,6 +2917,30 @@ static struct mlxreg_core_data mlxplat_mlxcpld_default_ng_regs_io_data[] = {
                .bit = GENMASK(7, 0),
                .mode = 0444,
        },
+       {
+               .label = "bios_safe_mode",
+               .reg = MLXPLAT_CPLD_LPC_REG_GPCOM0_OFFSET,
+               .mask = GENMASK(7, 0) & ~BIT(4),
+               .mode = 0444,
+       },
+       {
+               .label = "bios_active_image",
+               .reg = MLXPLAT_CPLD_LPC_REG_GPCOM0_OFFSET,
+               .mask = GENMASK(7, 0) & ~BIT(5),
+               .mode = 0444,
+       },
+       {
+               .label = "bios_auth_fail",
+               .reg = MLXPLAT_CPLD_LPC_REG_GPCOM0_OFFSET,
+               .mask = GENMASK(7, 0) & ~BIT(6),
+               .mode = 0444,
+       },
+       {
+               .label = "bios_upgrade_fail",
+               .reg = MLXPLAT_CPLD_LPC_REG_GPCOM0_OFFSET,
+               .mask = GENMASK(7, 0) & ~BIT(7),
+               .mode = 0444,
+       },
        {
                .label = "voltreg_update_status",
                .reg = MLXPLAT_CPLD_LPC_REG_GP0_RO_OFFSET,