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Diffstat (limited to 'common/cmd_sf.c')
-rw-r--r--common/cmd_sf.c86
1 files changed, 83 insertions, 3 deletions
diff --git a/common/cmd_sf.c b/common/cmd_sf.c
index 27d6e39..c8c547a 100644
--- a/common/cmd_sf.c
+++ b/common/cmd_sf.c
@@ -6,6 +6,7 @@
*/
#include <common.h>
+#include <malloc.h>
#include <spi_flash.h>
#include <asm/io.h>
@@ -109,6 +110,80 @@ static int do_spi_flash_probe(int argc, char * const argv[])
return 0;
}
+/**
+ * Write a block of data to SPI flash, first checking if it is different from
+ * what is already there.
+ *
+ * If the data being written is the same, then *skipped is incremented by len.
+ *
+ * @param flash flash context pointer
+ * @param offset flash offset to write
+ * @param len number of bytes to write
+ * @param buf buffer to write from
+ * @param cmp_buf read buffer to use to compare data
+ * @param skipped Count of skipped data (incremented by this function)
+ * @return NULL if OK, else a string containing the stage which failed
+ */
+static const char *spi_flash_update_block(struct spi_flash *flash, u32 offset,
+ size_t len, const char *buf, char *cmp_buf, size_t *skipped)
+{
+ debug("offset=%#x, sector_size=%#x, len=%#x\n",
+ offset, flash->sector_size, len);
+ if (spi_flash_read(flash, offset, len, cmp_buf))
+ return "read";
+ if (memcmp(cmp_buf, buf, len) == 0) {
+ debug("Skip region %x size %x: no change\n",
+ offset, len);
+ *skipped += len;
+ return NULL;
+ }
+ if (spi_flash_erase(flash, offset, len))
+ return "erase";
+ if (spi_flash_write(flash, offset, len, buf))
+ return "write";
+ return NULL;
+}
+
+/**
+ * Update an area of SPI flash by erasing and writing any blocks which need
+ * to change. Existing blocks with the correct data are left unchanged.
+ *
+ * @param flash flash context pointer
+ * @param offset flash offset to write
+ * @param len number of bytes to write
+ * @param buf buffer to write from
+ * @return 0 if ok, 1 on error
+ */
+static int spi_flash_update(struct spi_flash *flash, u32 offset,
+ size_t len, const char *buf)
+{
+ const char *err_oper = NULL;
+ char *cmp_buf;
+ const char *end = buf + len;
+ size_t todo; /* number of bytes to do in this pass */
+ size_t skipped; /* statistics */
+
+ cmp_buf = malloc(flash->sector_size);
+ if (cmp_buf) {
+ for (skipped = 0; buf < end && !err_oper;
+ buf += todo, offset += todo) {
+ todo = min(end - buf, flash->sector_size);
+ err_oper = spi_flash_update_block(flash, offset, todo,
+ buf, cmp_buf, &skipped);
+ }
+ } else {
+ err_oper = "malloc";
+ }
+ free(cmp_buf);
+ if (err_oper) {
+ printf("SPI flash failed in %s step\n", err_oper);
+ return 1;
+ }
+ printf("%zu bytes written, %zu bytes skipped\n", len - skipped,
+ skipped);
+ return 0;
+}
+
static int do_spi_flash_read_write(int argc, char * const argv[])
{
unsigned long addr;
@@ -137,7 +212,9 @@ static int do_spi_flash_read_write(int argc, char * const argv[])
return 1;
}
- if (strcmp(argv[0], "read") == 0)
+ if (strcmp(argv[0], "update") == 0)
+ ret = spi_flash_update(flash, offset, len, buf);
+ else if (strcmp(argv[0], "read") == 0)
ret = spi_flash_read(flash, offset, len, buf);
else
ret = spi_flash_write(flash, offset, len, buf);
@@ -203,7 +280,8 @@ static int do_spi_flash(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[
return 1;
}
- if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0)
+ if (strcmp(cmd, "read") == 0 || strcmp(cmd, "write") == 0 ||
+ strcmp(cmd, "update") == 0)
ret = do_spi_flash_read_write(argc, argv);
else if (strcmp(cmd, "erase") == 0)
ret = do_spi_flash_erase(argc, argv);
@@ -228,5 +306,7 @@ U_BOOT_CMD(
"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'\n"
- " `+len' round up `len' to block size"
+ " `+len' round up `len' to block size\n"
+ "sf update addr offset len - erase and write `len' bytes from memory\n"
+ " at `addr' to flash at `offset'"
);