diff options
Diffstat (limited to 'src/southbridge/amd/agesa/hudson/spi.c')
| -rw-r--r-- | src/southbridge/amd/agesa/hudson/spi.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/southbridge/amd/agesa/hudson/spi.c b/src/southbridge/amd/agesa/hudson/spi.c index f050a63f91..2aeb2c04c0 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 |