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sf command: allow default bus and chip selects 

This patch allows a board configuration file to provide default bus
and chip-selects for SPI flash so that first argument to the 'sf' command
is optional.

On boards that use the mxc_spi driver and a GPIO for chip select, this allows
a much simpler command line:
	U-Boot> sf probe
instead of
	U-Boot> sf probe 0x5300

Tested-by: Jason Liu <jason.hui@linaro.org>
Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Eric Nelson 2012-01-31 10:52:07 -07:00 committed by Mike Frysinger
parent 8b463dab93
commit c1173bd075
1 changed files with 20 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
common/cmd_sf.c
View File

@ -17,6 +17,12 @@
#ifndef CONFIG_SF_DEFAULT_MODE
# define CONFIG_SF_DEFAULT_MODE SPI_MODE_3
#endif
#ifndef CONFIG_SF_DEFAULT_CS
# define CONFIG_SF_DEFAULT_CS 0
#endif
#ifndef CONFIG_SF_DEFAULT_BUS
# define CONFIG_SF_DEFAULT_BUS 0
#endif
static struct spi_flash *flash;
@ -63,27 +69,26 @@ static int sf_parse_len_arg(char *arg, ulong *len)
static int do_spi_flash_probe(int argc, char * const argv[])
{
unsigned int bus = 0;
unsigned int cs;
unsigned int bus = CONFIG_SF_DEFAULT_BUS;
unsigned int cs = CONFIG_SF_DEFAULT_CS;
unsigned int speed = CONFIG_SF_DEFAULT_SPEED;
unsigned int mode = CONFIG_SF_DEFAULT_MODE;
char *endp;
struct spi_flash *new;
if (argc < 2)
return -1;
cs = simple_strtoul(argv[1], &endp, 0);
if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
return -1;
if (*endp == ':') {
if (endp[1] == 0)
if (argc >= 2) {
cs = simple_strtoul(argv[1], &endp, 0);
if (*argv[1] == 0 || (*endp != 0 && *endp != ':'))
return -1;
if (*endp == ':') {
if (endp[1] == 0)
return -1;
bus = cs;
cs = simple_strtoul(endp + 1, &endp, 0);
if (*endp != 0)
return -1;
bus = cs;
cs = simple_strtoul(endp + 1, &endp, 0);
if (*endp != 0)
return -1;
}
}
if (argc >= 3) {
@ -299,7 +304,7 @@ usage:
U_BOOT_CMD(
sf, 5, 1, do_spi_flash,
"SPI flash sub-system",
"probe [bus:]cs [hz] [mode] - init flash device on given SPI bus\n"
"probe [[bus:]cs] [hz] [mode] - init flash device on given SPI bus\n"
" and chip select\n"
"sf read addr offset len - read `len' bytes starting at\n"
" `offset' to memory at `addr'\n"