diff options
| author | Marshall Dawson <marshalldawson3rd@gmail.com> | 2019-09-04 11:00:06 -0600 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2019-09-09 22:19:33 +0000 |
| commit | ba2533f0ee952a2bbe90ed60d5ab3d4c19513aa0 (patch) | |
| tree | c2475556183b1e5dee88872b8f546b9e27b84e66 /src/soc/amd/common | |
| parent | 5aacda4b9824cebcc7d5f816419b6f9cc82be8a0 (diff) | |
soc/amd/common/lpc: Add decode disable function
It is already trivial to set D14F3x44 to 0, but add a function to wipe
both that and the settings in D14F3x48, along with x48's associated
addresses.
Change-Id: Ibec25562b2a1568681aea7caf86f00094c436a50
Signed-off-by: Marshall Dawson <marshalldawson3rd@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35270
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Richard Spiegel <richard.spiegel@silverbackltd.com>
Diffstat (limited to 'src/soc/amd/common')
| -rw-r--r-- | src/soc/amd/common/block/include/amdblocks/lpc.h | 4 | ||||
| -rw-r--r-- | src/soc/amd/common/block/lpc/lpc_util.c | 19 |
2 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 6b6745d9cb..f956ba3aa9 100644 --- a/src/soc/amd/common/block/include/amdblocks/lpc.h +++ b/src/soc/amd/common/block/include/amdblocks/lpc.h @@ -68,6 +68,7 @@ #define DECODE_IO_PORT_ENABLE2 BIT(18) #define DECODE_IO_PORT_ENABLE1 BIT(17) #define DECODE_IO_PORT_ENABLE0 BIT(16) +#define LPC_SYNC_TIMEOUT_COUNT_MASK (0xff << 8) #define LPC_SYNC_TIMEOUT_COUNT_ENABLE BIT(7) #define LPC_DECODE_RTC_IO_ENABLE BIT(6) #define DECODE_MEM_PORT_ENABLE0 BIT(5) @@ -134,6 +135,9 @@ #define PREFETCH_EN_SPI_FROM_HOST BIT(0) #define T_START_ENH BIT(3) +/* Clear all decoding to the LPC bus and erase any range registers associated + * with the enable bits. */ +void lpc_disable_decodes(void); /* LPC is typically enabled very early, but this function is last opportunity */ void soc_late_lpc_bridge_enable(void); void lpc_enable_port80(void); diff --git a/src/soc/amd/common/block/lpc/lpc_util.c b/src/soc/amd/common/block/lpc/lpc_util.c index 008d14c34e..1d46acbf5c 100644 --- a/src/soc/amd/common/block/lpc/lpc_util.c +++ b/src/soc/amd/common/block/lpc/lpc_util.c @@ -170,6 +170,25 @@ void lpc_enable_decode(uint32_t decodes) pci_write_config32(_LPCB_DEV, LPC_IO_PORT_DECODE_ENABLE, decodes); } +/* + * Clear all decoding to the LPC bus and erase any range registers associated + * with the enable bits. + */ +void lpc_disable_decodes(void) +{ + uint32_t reg; + + lpc_enable_decode(0); + reg = pci_read_config32(_LPCB_DEV, LPC_IO_OR_MEM_DECODE_ENABLE); + reg &= LPC_SYNC_TIMEOUT_COUNT_MASK | LPC_SYNC_TIMEOUT_COUNT_ENABLE; + pci_write_config32(_LPCB_DEV, LPC_IO_OR_MEM_DECODE_ENABLE, reg); + + /* D14F3x48 enables ranges configured in additional registers */ + pci_write_config32(_LPCB_DEV, LPC_MEM_PORT1, 0); + pci_write_config32(_LPCB_DEV, LPC_MEM_PORT0, 0); + pci_write_config32(_LPCB_DEV, LPC_WIDEIO2_GENERIC_PORT, 0); +} + uintptr_t lpc_spibase(void) { u32 base, enables; |