Kyösti Mälkki (kyosti.malkki@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/6164
-gerrit
commit 954c27cdfb6cd0851ebb57c03a5e3b87b94569e6 Author: Kyösti Mälkki kyosti.malkki@gmail.com Date: Mon Jun 30 07:34:36 2014 +0300
AMD SPI: Optimise for longer writes
Leave it to the implementation of flash->write() to split the writes to match SPI controller and SPI flash part restrictions. This allows for some optimisation for auto-address-increment (AAI) commands.
Kconfig AMD_SB_SPI_TX_LEN can be kept as local.
Change-Id: I4a8bc55ab7eb0eeda8f25003a8f5ff2a643ab7a7 Signed-off-by: Kyösti Mälkki kyosti.malkki@gmail.com --- src/cpu/amd/agesa/spi.c | 7 +------ src/southbridge/amd/Kconfig | 9 --------- src/southbridge/amd/agesa/hudson/spi.c | 15 +++++++++++++++ src/southbridge/amd/cimx/sb800/spi.c | 14 ++++++++++++++ 4 files changed, 30 insertions(+), 15 deletions(-)
diff --git a/src/cpu/amd/agesa/spi.c b/src/cpu/amd/agesa/spi.c index 5631053..1c652fd 100644 --- a/src/cpu/amd/agesa/spi.c +++ b/src/cpu/amd/agesa/spi.c @@ -40,12 +40,7 @@ void spi_SaveS3info(u32 pos, u32 size, u8 *buf, u32 len)
flash->erase(flash, pos, size); flash->write(flash, pos, sizeof(len), &len); - - u32 nvram_pos; - for (nvram_pos = 0; nvram_pos < len - CONFIG_AMD_SB_SPI_TX_LEN; nvram_pos += CONFIG_AMD_SB_SPI_TX_LEN) { - flash->write(flash, nvram_pos + pos + 4, CONFIG_AMD_SB_SPI_TX_LEN, (u8 *)(buf + nvram_pos)); - } - flash->write(flash, nvram_pos + pos + 4, len % CONFIG_AMD_SB_SPI_TX_LEN, (u8 *)(buf + nvram_pos)); + flash->write(flash, pos + sizeof(len), len, buf);
flash->spi->rw = SPI_WRITE_FLAG; spi_release_bus(flash->spi); diff --git a/src/southbridge/amd/Kconfig b/src/southbridge/amd/Kconfig index 39aeb09..867afca 100644 --- a/src/southbridge/amd/Kconfig +++ b/src/southbridge/amd/Kconfig @@ -14,12 +14,3 @@ source src/southbridge/amd/sb800/Kconfig source src/southbridge/amd/cimx/Kconfig source src/southbridge/amd/agesa/Kconfig source src/southbridge/amd/sr5650/Kconfig - -if CPU_AMD_AGESA - -config AMD_SB_SPI_TX_LEN - int - default 4 - depends on SPI_FLASH - -endif diff --git a/src/southbridge/amd/agesa/hudson/spi.c b/src/southbridge/amd/agesa/hudson/spi.c index f050a63..2aeb2c0 100644 --- a/src/southbridge/amd/agesa/hudson/spi.c +++ b/src/southbridge/amd/agesa/hudson/spi.c @@ -20,6 +20,7 @@ #include <stdlib.h> #include <string.h> #include <arch/io.h> +#include <console/console.h> #include <spi-generic.h> #include <device/device.h> #include <device/pci.h> @@ -101,6 +102,20 @@ int spi_xfer(struct spi_slave *slave, const void *dout, u8 count;
bytesout--; + + /* + * Check if this is a write command attempting to transfer more bytes + * than the controller can handle. Iterations for writes are not + * supported here because each SPI write command needs to be preceded + * and followed by other SPI commands, and this sequence is controlled + * by the SPI chip driver. + */ + if (bytesout > AMD_SB_SPI_TX_LEN) { + printk(BIOS_DEBUG, "FCH SPI: Too much to write. Does your SPI chip driver use" + " spi_crop_chunk()?\n"); + return -1; + } + readoffby1 = bytesout ? 0 : 1;
#if CONFIG_SOUTHBRIDGE_AMD_AGESA_YANGTZE diff --git a/src/southbridge/amd/cimx/sb800/spi.c b/src/southbridge/amd/cimx/sb800/spi.c index e5b2407..f38e691 100644 --- a/src/southbridge/amd/cimx/sb800/spi.c +++ b/src/southbridge/amd/cimx/sb800/spi.c @@ -20,6 +20,7 @@ #include <stdlib.h> #include <string.h> #include <arch/io.h> +#include <console/console.h> #include <spi-generic.h> #include <device/device.h> #include <device/pci.h> @@ -74,6 +75,19 @@ int spi_xfer(struct spi_slave *slave, const void *dout,
bytesout--;
+ /* + * Check if this is a write command attempting to transfer more bytes + * than the controller can handle. Iterations for writes are not + * supported here because each SPI write command needs to be preceded + * and followed by other SPI commands, and this sequence is controlled + * by the SPI chip driver. + */ + if (bytesout > AMD_SB_SPI_TX_LEN) { + printk(BIOS_DEBUG, "FCH SPI: Too much to write. Does your SPI chip driver use" + " spi_crop_chunk()?\n"); + return -1; + } + readoffby1 = bytesout ? 0 : 1;
readwrite = (bytesin + readoffby1) << 4 | bytesout;