diff options
| author | Martin Roth <martinroth@google.com> | 2016-08-31 12:44:14 -0600 |
|---|---|---|
| committer | Martin Roth <martinroth@google.com> | 2016-08-31 21:16:06 +0200 |
| commit | a795ae1392327a17d37193834271883743b21311 (patch) | |
| tree | bed189275e562fc0d92f54c41fddbb7f07af4325 /src/southbridge/amd/sb700 | |
| parent | 61e6c4448c4d79035842434fb1eb3b4e9cd01c6d (diff) | |
amd/sb700/bootblock.c: Restore accidentally deleted code
The recent changes to this file from commit 6e5421d2
(sb/amd/sb700: Add option to increase SPI speed to 33MHz)
were accidentally removed in a code cleanup patch:
commit ba28e8d7 (src/southbridge: Code formating).
Change-Id: I6cf3e8f29d5c0384d35637f35e051be40318d20f
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/16384
Reviewed-by: Timothy Pearson <tpearson@raptorengineering.com>
Tested-by: build bot (Jenkins)
Diffstat (limited to 'src/southbridge/amd/sb700')
| -rw-r--r-- | src/southbridge/amd/sb700/Kconfig | 10 | ||||
| -rw-r--r-- | src/southbridge/amd/sb700/bootblock.c | 34 |
2 files changed, 44 insertions, 0 deletions
diff --git a/src/southbridge/amd/sb700/Kconfig b/src/southbridge/amd/sb700/Kconfig index 9a988a90f8..353c2a46c7 100644 --- a/src/southbridge/amd/sb700/Kconfig +++ b/src/southbridge/amd/sb700/Kconfig @@ -25,6 +25,16 @@ config SOUTHBRIDGE_SPECIFIC_OPTIONS # dummy select HAVE_HARD_RESET select SMBUS_HAS_AUX_CHANNELS +config SOUTHBRIDGE_AMD_SB700_33MHZ_SPI + bool "Enable high speed SPI clock" + default n + help + When set, the SPI clock will run at 33MHz instead + of the compatibility mode 16.5MHz. Note that not + all ROMs are capable of 33MHz operation, so you + will need to verify this option is appropriate for + the ROM you are using. + # Set for southbridge SP5100 which also uses SB700 driver config SOUTHBRIDGE_AMD_SUBTYPE_SP5100 bool diff --git a/src/southbridge/amd/sb700/bootblock.c b/src/southbridge/amd/sb700/bootblock.c index 97e749ce08..dfa4102953 100644 --- a/src/southbridge/amd/sb700/bootblock.c +++ b/src/southbridge/amd/sb700/bootblock.c @@ -20,6 +20,10 @@ #define IO_MEM_PORT_DECODE_ENABLE_5 0x48 #define IO_MEM_PORT_DECODE_ENABLE_6 0x4a +#define SPI_BASE_ADDRESS 0xa0 + +#define SPI_CONTROL_1 0xc +#define TEMPORARY_SPI_BASE_ADDRESS 0xfec10000 /* * Enable 4MB (LPC) ROM access at 0xFFC00000 - 0xFFFFFFFF. @@ -92,7 +96,37 @@ static void sb700_enable_rom(void) pci_io_write_config8(dev, IO_MEM_PORT_DECODE_ENABLE_6, reg8); } +static void sb700_configure_rom(void) +{ + pci_devfn_t dev; + uint32_t dword; + + dev = PCI_DEV(0, 0x14, 3); + + if (IS_ENABLED(CONFIG_SOUTHBRIDGE_AMD_SB700_33MHZ_SPI)) { + uint32_t prev_spi_cfg; + volatile uint32_t *spi_mmio; + + /* Temporarily set up SPI access to change SPI speed */ + prev_spi_cfg = dword = pci_io_read_config32(dev, SPI_BASE_ADDRESS); + dword &= ~(0x7ffffff << 5); /* SPI_BaseAddr */ + dword |= TEMPORARY_SPI_BASE_ADDRESS & (0x7ffffff << 5); + dword |= (0x1 << 1); /* SpiRomEnable = 1 */ + pci_io_write_config32(dev, SPI_BASE_ADDRESS, dword); + + spi_mmio = (void *)(TEMPORARY_SPI_BASE_ADDRESS + SPI_CONTROL_1); + dword = *spi_mmio; + dword &= ~(0x3 << 12); /* NormSpeed = 0x1 */ + dword |= (0x1 << 12); + *spi_mmio = dword; + + /* Restore previous SPI access */ + pci_io_write_config32(dev, SPI_BASE_ADDRESS, prev_spi_cfg); + } +} + static void bootblock_southbridge_init(void) { sb700_enable_rom(); + sb700_configure_rom(); } |