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flash/nor: at91samd protection bits write fix 

Flash protection set on a device with MANW=1 was lost after reset.
Since #2903 the driver honored MANW bit and issued Write Page command just
for main flash write. This change adds similar technique to
samd_modify_user_row().

Minor code improvements:
samd_check_error() returns error code corresponding to error type
instead of bool.

samd_check_error() does not clear STATUS register if no error bit is set.

Eliminated double error check in call sequence samd_issue_nvmctrl_command()
folowed by samd_check_error().

Missing error code ERROR_FLASH_PROTECTED added to src/flash/common.h.

Change-Id: Icf59ab8803305d0cb3170c8a5089b8f9828b99f8
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: http://openocd.zylin.com/3550
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
This commit is contained in:
Tomas Vanek 2016-07-18 22:59:17 +02:00 committed by Paul Fertser
parent 25d7ba19c9
commit 4732471b2e
2 changed files with 44 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
src/flash/common.h
View File

@ -44,5 +44,6 @@ bool flash_driver_name_matches(const char *name, const char *expected);
#define ERROR_FLASH_SECTOR_NOT_ERASED (-906)
#define ERROR_FLASH_BANK_NOT_PROBED (-907)
#define ERROR_FLASH_OPER_UNSUPPORTED (-908)
#define ERROR_FLASH_PROTECTED (-909)
#endif /* OPENOCD_FLASH_COMMON_H */

83
src/flash/nor/at91samd.c
View File

@ -423,39 +423,43 @@ static int samd_probe(struct flash_bank *bank)
return ERROR_OK;
}
static bool samd_check_error(struct target *target)
static int samd_check_error(struct target *target)
{
int ret;
bool error;
int ret, ret2;
uint16_t status;
ret = target_read_u16(target,
SAMD_NVMCTRL + SAMD_NVMCTRL_STATUS, &status);
if (ret != ERROR_OK) {
LOG_ERROR("Can't read NVM status");
return true;
return ret;
}
if (status & 0x001C) {
if (status & (1 << 4)) /* NVME */
LOG_ERROR("SAMD: NVM Error");
if (status & (1 << 3)) /* LOCKE */
LOG_ERROR("SAMD: NVM lock error");
if (status & (1 << 2)) /* PROGE */
LOG_ERROR("SAMD: NVM programming error");
if ((status & 0x001C) == 0)
return ERROR_OK;
error = true;
} else {
error = false;
if (status & (1 << 4)) { /* NVME */
LOG_ERROR("SAMD: NVM Error");
ret = ERROR_FLASH_OPERATION_FAILED;
}
if (status & (1 << 3)) { /* LOCKE */
LOG_ERROR("SAMD: NVM lock error");
ret = ERROR_FLASH_PROTECTED;
}
if (status & (1 << 2)) { /* PROGE */
LOG_ERROR("SAMD: NVM programming error");
ret = ERROR_FLASH_OPER_UNSUPPORTED;
}
/* Clear the error conditions by writing a one to them */
ret = target_write_u16(target,
ret2 = target_write_u16(target,
SAMD_NVMCTRL + SAMD_NVMCTRL_STATUS, status);
if (ret != ERROR_OK)
if (ret2 != ERROR_OK)
LOG_ERROR("Can't clear NVM error conditions");
return error;
return ret;
}
static int samd_issue_nvmctrl_command(struct target *target, uint16_t cmd)
@ -474,10 +478,7 @@ static int samd_issue_nvmctrl_command(struct target *target, uint16_t cmd)
return res;
/* Check to see if the NVM command resulted in an error condition. */
if (samd_check_error(target))
return ERROR_FAIL;
return ERROR_OK;
return samd_check_error(target);
}
static int samd_erase_row(struct target *target, uint32_t address)
@ -531,12 +532,19 @@ static int samd_modify_user_row(struct target *target, uint32_t value,
uint8_t startb, uint8_t endb)
{
int res;
uint32_t nvm_ctrlb;
bool manual_wp = true;
if (is_user_row_reserved_bit(startb) || is_user_row_reserved_bit(endb)) {
LOG_ERROR("Can't modify bits in the requested range");
return ERROR_FAIL;
}
/* Check if we need to do manual page write commands */
res = target_read_u32(target, SAMD_NVMCTRL + SAMD_NVMCTRL_CTRLB, &nvm_ctrlb);
if (res == ERROR_OK)
manual_wp = (nvm_ctrlb & SAMD_NVM_CTRLB_MANW) != 0;
/* Retrieve the MCU's page size, in bytes. This is also the size of the
* entire User Row. */
uint32_t page_size;
@ -559,8 +567,8 @@ static int samd_modify_user_row(struct target *target, uint32_t value,
if (!buf)
return ERROR_FAIL;
/* Read the user row (comprising one page) by half-words. */
res = target_read_memory(target, SAMD_USER_ROW, 2, page_size / 2, buf);
/* Read the user row (comprising one page) by words. */
res = target_read_memory(target, SAMD_USER_ROW, 4, page_size / 4, buf);
if (res != ERROR_OK)
goto out_user_row;
@ -579,20 +587,18 @@ static int samd_modify_user_row(struct target *target, uint32_t value,
/* Modify */
buf_set_u32(buf, startb, endb - startb + 1, value);
/* Write the page buffer back out to the target. A Flash write will be
* triggered automatically. */
/* Write the page buffer back out to the target. */
res = target_write_memory(target, SAMD_USER_ROW, 4, page_size / 4, buf);
if (res != ERROR_OK)
goto out_user_row;
if (samd_check_error(target)) {
res = ERROR_FAIL;
goto out_user_row;
if (manual_wp) {
/* Trigger flash write */
res = samd_issue_nvmctrl_command(target, SAMD_NVM_CMD_WAP);
} else {
res = samd_check_error(target);
}
/* Success */
res = ERROR_OK;
out_user_row:
free(buf);
@ -784,18 +790,15 @@ static int samd_write(struct flash_bank *bank, const uint8_t *buffer,
* then issue CMD_WP always */
if (manual_wp || pg_offset + 4 * nw < chip->page_size) {
res = samd_issue_nvmctrl_command(bank->target, SAMD_NVM_CMD_WP);
if (res != ERROR_OK) {
LOG_ERROR("%s: %d", __func__, __LINE__);
goto free_pb;
}
} else {
/* Access through AHB is stalled while flash is being programmed */
usleep(200);
res = samd_check_error(bank->target);
}
/* Access through AHB is stalled while flash is being programmed */
usleep(200);
if (samd_check_error(bank->target)) {
if (res != ERROR_OK) {
LOG_ERROR("%s: write failed at address 0x%08" PRIx32, __func__, address);
res = ERROR_FAIL;
goto free_pb;
}