[U-Boot] [PATCH 03/11] st_smi: Return error in case TFF is not set

Amit Virdi
2012-02-24T12:23:06Z

Curently the code makes wrong assumption that the Transfer finished flag shall
be set within the stipulated time. However, there may occur a scenario in which
the TFF flag is not set. Return error in that case.

Signed-off-by: Vipin Kumar <vipin.kumar@st.com>
Signed-off-by: Amit Virdi <amit.virdi@st.com>
---
drivers/mtd/st_smi.c | 22 ++++++++++++++--------
1 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/drivers/mtd/st_smi.c b/drivers/mtd/st_smi.c
index 82f1fe1..ec19b0d 100644
--- a/drivers/mtd/st_smi.c
+++ b/drivers/mtd/st_smi.c
@@ -58,13 +58,15 @@ static struct flash_dev flash_ids[] = {
*
* Wait until TFF is set in status register
*/
-static void smi_wait_xfer_finish(int timeout)
+static int smi_wait_xfer_finish(int timeout)
{
- while (timeout--) {
+ do {
if (readl(&smicntl->smi_sr) & TFF)
- break;
+ return 0;
udelay(1000);
- }
+ } while (timeout--);
+
+ return -1;
}

/*
@@ -83,7 +85,8 @@ static unsigned int smi_read_id(flash_info_t *info, int banknum)
writel((banknum << BANKSEL_SHIFT) | SEND | TX_LEN_1 | RX_LEN_3,
&smicntl->smi_cr2);

- smi_wait_xfer_finish(XFER_FINISH_TOUT);
+ if (smi_wait_xfer_finish(XFER_FINISH_TOUT))
+ return -EIO;

value = (readl(&smicntl->smi_rr) & 0x00FFFFFF);

@@ -151,7 +154,8 @@ static unsigned int smi_read_sr(int bank)
/* Performing a RSR instruction in HW mode */
writel((bank << BANKSEL_SHIFT) | RD_STATUS_REG, &smicntl->smi_cr2);

- smi_wait_xfer_finish(XFER_FINISH_TOUT);
+ if (smi_wait_xfer_finish(XFER_FINISH_TOUT))
+ return -1;

/* Restore the CTRL REG1 state */
writel(ctrlreg1, &smicntl->smi_cr1);
@@ -211,7 +215,8 @@ static int smi_write_enable(int bank)
/* Give the Flash, Write Enable command */
writel((bank << BANKSEL_SHIFT) | WE, &smicntl->smi_cr2);

- smi_wait_xfer_finish(XFER_FINISH_TOUT);
+ if (smi_wait_xfer_finish(XFER_FINISH_TOUT))
+ return -1;

/* Restore the CTRL REG1 state */
writel(ctrlreg1, &smicntl->smi_cr1);
@@ -292,7 +297,8 @@ static int smi_sector_erase(flash_info_t *info, unsigned int sector)
writel(instruction, &smicntl->smi_tr);
writel((bank << BANKSEL_SHIFT) | SEND | TX_LEN_4,
&smicntl->smi_cr2);
- smi_wait_xfer_finish(XFER_FINISH_TOUT);
+ if (smi_wait_xfer_finish(XFER_FINISH_TOUT))
+ return -EIO;

if (smi_wait_till_ready(bank, CONFIG_SYS_FLASH_ERASE_TOUT))
return -EBUSY;
--
1.7.2.2