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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)
This commit is contained in:
Martin Roth 2016-08-31 12:44:14 -06:00
parent 61e6c4448c
commit a795ae1392
2 changed files with 44 additions and 0 deletions
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10
src/southbridge/amd/sb700/Kconfig
View File

@ -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

34
src/southbridge/amd/sb700/bootblock.c
View File

@ -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();
}