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authorStefan Roese <sr@denx.de>2012-02-02 13:25:45 +0100
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-07-07 14:07:44 +0200
commit185b3b76a6a2e4eacb9e74a633950231e6787384 (patch)
tree2ee1976babc42418a42908ce3aa3d528033a32c3 /drivers/mtd/st_smi.c
parent496ba48f5ec60187d9ff7e4298e3d37677d74530 (diff)
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MTD: SPEAr SMI: Add write support for length < 4 bytes
Needed for redundant environment for example. Signed-off-by: Stefan Roese <sr@denx.de> Cc: Amit Virdi <amit.virdi@st.com> Cc: Vipin Kumar <vipin.kumar@st.com>
Diffstat (limited to 'drivers/mtd/st_smi.c')
-rw-r--r--drivers/mtd/st_smi.c22
1 files changed, 18 insertions, 4 deletions
diff --git a/drivers/mtd/st_smi.c b/drivers/mtd/st_smi.c
index 77e36af..7507e5d 100644
--- a/drivers/mtd/st_smi.c
+++ b/drivers/mtd/st_smi.c
@@ -362,7 +362,7 @@ static int smi_sector_erase(flash_info_t *info, unsigned int sector)
* smi_write - Write to SMI flash
* @src_addr: source buffer
* @dst_addr: destination buffer
- * @length: length to write in words
+ * @length: length to write in bytes
* @bank: bank base address
*
* Write to SMI flash
@@ -370,7 +370,10 @@ static int smi_sector_erase(flash_info_t *info, unsigned int sector)
static int smi_write(unsigned int *src_addr, unsigned int *dst_addr,
unsigned int length, ulong bank_addr)
{
+ u8 *src_addr8 = (u8 *)src_addr;
+ u8 *dst_addr8 = (u8 *)dst_addr;
int banknum;
+ int i;
switch (bank_addr) {
case SMIBANK0_BASE:
@@ -399,7 +402,7 @@ static int smi_write(unsigned int *src_addr, unsigned int *dst_addr,
return -EIO;
/* Perform the write command */
- while (length--) {
+ for (i = 0; i < length; i += 4) {
if (((ulong) (dst_addr) % SFLASH_PAGE_SIZE) == 0) {
if (smi_wait_till_ready(banknum,
CONFIG_SYS_FLASH_WRITE_TOUT))
@@ -409,7 +412,18 @@ static int smi_write(unsigned int *src_addr, unsigned int *dst_addr,
return -EIO;
}
- *dst_addr++ = *src_addr++;
+ if (length < 4) {
+ int k;
+
+ /*
+ * Handle special case, where length < 4 (redundant env)
+ */
+ for (k = 0; k < length; k++)
+ *dst_addr8++ = *src_addr8++;
+ } else {
+ /* Normal 32bit write */
+ *dst_addr++ = *src_addr++;
+ }
if ((readl(&smicntl->smi_sr) & (ERF1 | ERF2)))
return -EIO;
@@ -435,7 +449,7 @@ static int smi_write(unsigned int *src_addr, unsigned int *dst_addr,
int write_buff(flash_info_t *info, uchar *src, ulong dest_addr, ulong length)
{
return smi_write((unsigned int *)src, (unsigned int *)dest_addr,
- (length + 3) / 4, info->start[0]);
+ length, info->start[0]);
}
/*