diff options
| author | Raul E Rangel <rrangel@chromium.org> | 2020-05-01 14:04:08 -0600 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2020-05-05 12:59:33 +0000 |
| commit | 314c716aff9895221f1f5b8bef4d3889a7749c0a (patch) | |
| tree | a1520b205e0f624a9e235433d3d7f7129369ca52 /src/soc/amd | |
| parent | 65cc80f740a736d3b947268c157d3331a7cec922 (diff) | |
soc/amd/common/block/lpc: Add lpc_disable_spi_rom_sharing
If a Picasso platform wants to use GPIO 67 it must disable ROM sharing.
Otherwise ROM access is incredibly slow.
BUG=b:153502861
TEST=Build trembyle
Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Change-Id: Ia9ab3803a2f56f68c1164bd241fc3917a3ffcf2b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/40951
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Diffstat (limited to 'src/soc/amd')
| -rw-r--r-- | src/soc/amd/common/block/include/amdblocks/lpc.h | 3 | ||||
| -rw-r--r-- | src/soc/amd/common/block/lpc/Kconfig | 6 | ||||
| -rw-r--r-- | src/soc/amd/common/block/lpc/lpc_util.c | 14 |
3 files changed, 23 insertions, 0 deletions
diff --git a/src/soc/amd/common/block/include/amdblocks/lpc.h b/src/soc/amd/common/block/include/amdblocks/lpc.h index dc33073d3e..1d74823542 100644 --- a/src/soc/amd/common/block/include/amdblocks/lpc.h +++ b/src/soc/amd/common/block/include/amdblocks/lpc.h @@ -10,6 +10,8 @@ /* PCI registers for D14F3 */ #define LPC_PCI_CONTROL 0x40 #define LEGACY_DMA_EN BIT(2) +#define VW_ROM_SHARING_EN BIT(3) +#define EXT_ROM_SHARING_EN BIT(4) #define LPC_IO_PORT_DECODE_ENABLE 0x44 #define DECODE_ENABLE_PARALLEL_PORT0 BIT(0) @@ -148,6 +150,7 @@ void lpc_tpm_decode(void); void lpc_tpm_decode_spi(void); void lpc_enable_rom(void); void lpc_enable_spi_prefetch(void); +void lpc_disable_spi_rom_sharing(void); /** * @brief Find the size of a particular wide IO diff --git a/src/soc/amd/common/block/lpc/Kconfig b/src/soc/amd/common/block/lpc/Kconfig index b0d59a55f4..3cfbfe5dcd 100644 --- a/src/soc/amd/common/block/lpc/Kconfig +++ b/src/soc/amd/common/block/lpc/Kconfig @@ -3,3 +3,9 @@ config SOC_AMD_COMMON_BLOCK_LPC default n help Select this option to use the traditional LPC-ISA bridge at D14F3. + +config PROVIDES_ROM_SHARING + bool + default n + help + Select this option if the LPC bridge supports ROM sharing. diff --git a/src/soc/amd/common/block/lpc/lpc_util.c b/src/soc/amd/common/block/lpc/lpc_util.c index 571c6fe8ed..45b252f99b 100644 --- a/src/soc/amd/common/block/lpc/lpc_util.c +++ b/src/soc/amd/common/block/lpc/lpc_util.c @@ -1,6 +1,7 @@ /* SPDX-License-Identifier: GPL-2.0-only */ /* This file is part of the coreboot project. */ +#include <assert.h> #include <stdint.h> #include <device/device.h> #include <device/pci_ops.h> @@ -300,6 +301,19 @@ void lpc_enable_spi_prefetch(void) pci_write_config32(_LPCB_DEV, LPC_ROM_DMA_EC_HOST_CONTROL, dword); } +void lpc_disable_spi_rom_sharing(void) +{ + u8 byte; + + if (!CONFIG(PROVIDES_ROM_SHARING)) + dead_code(); + + byte = pci_read_config8(_LPCB_DEV, LPC_PCI_CONTROL); + byte &= ~VW_ROM_SHARING_EN; + byte &= ~EXT_ROM_SHARING_EN; + pci_write_config8(_LPCB_DEV, LPC_PCI_CONTROL, byte); +} + uintptr_t lpc_get_spibase(void) { u32 base; |