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norflash: Clear status register before sending commands

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The status register bits remain until explicitly cleared, which means
that a command can be incorrectly considered to have generated an error -
for example, after reset the status register contents may be unknown or
if a previous command had failed.

This patch clears the status register before beginning any command to
be sure that the status register only represents information about the
current operation.

Change-Id: I9e98110ee24179937215461c00b6543a3467b350
Signed-off-by: Roberto Vargas <roberto.vargas@arm.com>
This commit is contained in:
Roberto Vargas 2017-07-26 15:17:24 +01:00
parent 9753cb5b51
commit b4b09ca567
1 changed files with 8 additions and 2 deletions
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10
plat/arm/board/common/drivers/norflash/norflash.c
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@ -68,6 +68,8 @@ int nor_word_program(uintptr_t base_addr, unsigned long data)
uint32_t status;
int ret;
nor_send_cmd(base_addr, NOR_CMD_CLEAR_STATUS_REG);
/* Set the device in write word mode */
nor_send_cmd(base_addr, NOR_CMD_WORD_PROGRAM);
mmio_write_32(base_addr, data);
@ -98,8 +100,10 @@ int nor_lock(uintptr_t base_addr)
{
int ret;
nor_send_cmd(base_addr, NOR_CMD_CLEAR_STATUS_REG);
nor_send_cmd(base_addr, NOR_CMD_LOCK_UNLOCK);
mmio_write_32(base_addr, NOR_2X16(NOR_LOCK_BLOCK));
nor_send_cmd(base_addr, NOR_LOCK_BLOCK);
ret = nor_poll_dws(base_addr, DWS_WORD_LOCK_RETRIES);
nor_send_cmd(base_addr, NOR_CMD_READ_ARRAY);
@ -117,8 +121,10 @@ int nor_unlock(uintptr_t base_addr)
{
int ret;
nor_send_cmd(base_addr, NOR_CMD_CLEAR_STATUS_REG);
nor_send_cmd(base_addr, NOR_CMD_LOCK_UNLOCK);
mmio_write_32(base_addr, NOR_2X16(NOR_UNLOCK_BLOCK));
nor_send_cmd(base_addr, NOR_UNLOCK_BLOCK);
ret = nor_poll_dws(base_addr, DWS_WORD_LOCK_RETRIES);
nor_send_cmd(base_addr, NOR_CMD_READ_ARRAY);