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stm32: stm32_flash: add memory barrier during flash write

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After writing data to flash space, next instruction is checking if flash
controller is busy writing to the flash memory. Memory barrier is required here
to avoid transaction re-ordering for data write and busy status check.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>
This commit is contained in:
Vikas Manocha 2016-04-04 16:49:02 -07:00 committed by Tom Rini
parent 3ba1352b97
commit 9082517a85
1 changed files with 4 additions and 0 deletions
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4
drivers/mtd/stm32_flash.c
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@ -137,6 +137,10 @@ int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
/* To make things simple use byte writes only */
for (i = 0; i < cnt; i++) {
*(uchar *)(addr + i) = src[i];
/* avoid re-ordering flash data write and busy status
* check as flash memory space attributes are generally Normal
*/
mb();
while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
;
}