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authorRichard Retanubun <RichardRetanubun@ruggedcom.com>2011-02-16 16:39:44 -0500
committerMike Frysinger <vapier@gentoo.org>2011-04-12 02:30:25 -0400
commit334eb4b02f90c7223ee92e49307089590c77992c (patch)
tree0d57561f7da221506b51deda8bb3766183a54816
parentf8f0757dcb117664a712650f000433e765acffbd (diff)
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cmd_sf: add handler for +len arg for erase command
This patch adds [+]len handler for the erase command that will automatically round up the requested erase length to the flash's sector_size. Signed-off-by: Richard Retanubun <RichardRetanubun@RuggedCom.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
-rw-r--r--common/cmd_sf.c51
1 files changed, 47 insertions, 4 deletions
diff --git a/common/cmd_sf.c b/common/cmd_sf.c
index 6e7be81..afbef99 100644
--- a/common/cmd_sf.c
+++ b/common/cmd_sf.c
@@ -19,6 +19,47 @@
static struct spi_flash *flash;
+
+/*
+ * This function computes the length argument for the erase command.
+ * The length on which the command is to operate can be given in two forms:
+ * 1. <cmd> offset len - operate on <'offset', 'len')
+ * 2. <cmd> offset +len - operate on <'offset', 'round_up(len)')
+ * If the second form is used and the length doesn't fall on the
+ * sector boundary, than it will be adjusted to the next sector boundary.
+ * If it isn't in the flash, the function will fail (return -1).
+ * Input:
+ * arg: length specification (i.e. both command arguments)
+ * Output:
+ * len: computed length for operation
+ * Return:
+ * 1: success
+ * -1: failure (bad format, bad address).
+ */
+static int sf_parse_len_arg(char *arg, ulong *len)
+{
+ char *ep;
+ char round_up_len; /* indicates if the "+length" form used */
+ ulong len_arg;
+
+ round_up_len = 0;
+ if (*arg == '+') {
+ round_up_len = 1;
+ ++arg;
+ }
+
+ len_arg = simple_strtoul(arg, &ep, 16);
+ if (ep == arg || *ep != '\0')
+ return -1;
+
+ if (round_up_len && flash->sector_size > 0)
+ *len = ROUND(len_arg - 1, flash->sector_size);
+ else
+ *len = len_arg;
+
+ return 1;
+}
+
static int do_spi_flash_probe(int argc, char * const argv[])
{
unsigned int bus = 0;
@@ -135,8 +176,9 @@ static int do_spi_flash_erase(int argc, char * const argv[])
offset = simple_strtoul(argv[1], &endp, 16);
if (*argv[1] == 0 || *endp != 0)
goto usage;
- len = simple_strtoul(argv[2], &endp, 16);
- if (*argv[2] == 0 || *endp != 0)
+
+ ret = sf_parse_len_arg(argv[2], &len);
+ if (ret != 1)
goto usage;
ret = spi_flash_erase(flash, offset, len);
@@ -148,7 +190,7 @@ static int do_spi_flash_erase(int argc, char * const argv[])
return 0;
usage:
- puts("Usage: sf erase offset len\n");
+ puts("Usage: sf erase offset [+]len\n");
return 1;
}
@@ -189,5 +231,6 @@ U_BOOT_CMD(
" `offset' to memory at `addr'\n"
"sf write addr offset len - write `len' bytes from memory\n"
" at `addr' to flash at `offset'\n"
- "sf erase offset len - erase `len' bytes from `offset'"
+ "sf erase offset [+]len - erase `len' bytes from `offset'\n"
+ " `+len' round up `len' to block size"
);