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flash/nor/stm32f1x: allow write fallback for flash options 

Mostly refactoring.

Rename original stm32x_write_block() to stm32x_write_block_async()
as it uses target async algo.

Introduce new stm32x_write_block() and move slow, host controlled
fallback flash write there.

The change allows stm32x_write_options() to use slow flash write fallback.

While on it rename variables where halfword count is stored.

Change-Id: I386ae15cf052b1490461ed8f7eea5b4403d466f7
Signed-off-by: Tomas Vanek <vanekt@fbl.cz>
Reviewed-on: https://review.openocd.org/c/openocd/+/6706
Tested-by: jenkins
Reviewed-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
This commit is contained in:
Tomas Vanek 2021-11-16 17:51:09 +01:00
parent 7c6d379cf4
commit dd532e87c0
1 changed files with 50 additions and 34 deletions
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84
src/flash/nor/stm32f1x.c
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@ -131,7 +131,7 @@ struct stm32x_flash_bank {
static int stm32x_mass_erase(struct flash_bank *bank);
static int stm32x_get_device_id(struct flash_bank *bank, uint32_t *device_id);
static int stm32x_write_block(struct flash_bank *bank, const uint8_t *buffer,
uint32_t address, uint32_t count);
uint32_t address, uint32_t hwords_count);
/* flash bank stm32x <base> <size> 0 0 <target#>
*/
@ -329,12 +329,14 @@ static int stm32x_write_options(struct flash_bank *bank)
target_buffer_set_u16(target, opt_bytes + 12, (stm32x_info->option_bytes.protection >> 16) & 0xff);
target_buffer_set_u16(target, opt_bytes + 14, (stm32x_info->option_bytes.protection >> 24) & 0xff);
/* Block write is preferred in favour of operation with ancient ST-Link
* firmwares without 16-bit memory access. See
* 480: flash: stm32f1x: write option bytes using the loader
* https://review.openocd.org/c/openocd/+/480
*/
retval = stm32x_write_block(bank, opt_bytes, STM32_OB_RDP, sizeof(opt_bytes) / 2);
if (retval != ERROR_OK) {
if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE)
LOG_ERROR("working area required to erase options bytes");
if (retval != ERROR_OK)
return retval;
}
retval = target_write_u32(target, STM32_FLASH_CR_B0, FLASH_LOCK);
if (retval != ERROR_OK)
@ -442,8 +444,8 @@ static int stm32x_protect(struct flash_bank *bank, int set, unsigned int first,
return stm32x_write_options(bank);
}
static int stm32x_write_block(struct flash_bank *bank, const uint8_t *buffer,
uint32_t address, uint32_t count)
static int stm32x_write_block_async(struct flash_bank *bank, const uint8_t *buffer,
uint32_t address, uint32_t hwords_count)
{
struct stm32x_flash_bank *stm32x_info = bank->driver_priv;
struct target *target = bank->target;
@ -493,7 +495,7 @@ static int stm32x_write_block(struct flash_bank *bank, const uint8_t *buffer,
init_reg_param(&reg_params[4], "r4", 32, PARAM_IN_OUT); /* target address */
buf_set_u32(reg_params[0].value, 0, 32, stm32x_info->register_base);
buf_set_u32(reg_params[1].value, 0, 32, count);
buf_set_u32(reg_params[1].value, 0, 32, hwords_count);
buf_set_u32(reg_params[2].value, 0, 32, source->address);
buf_set_u32(reg_params[3].value, 0, 32, source->address + source->size);
buf_set_u32(reg_params[4].value, 0, 32, address);
@ -501,7 +503,7 @@ static int stm32x_write_block(struct flash_bank *bank, const uint8_t *buffer,
armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
armv7m_info.core_mode = ARM_MODE_THREAD;
retval = target_run_flash_async_algorithm(target, buffer, count, 2,
retval = target_run_flash_async_algorithm(target, buffer, hwords_count, 2,
0, NULL,
5, reg_params,
source->address, source->size,
@ -537,6 +539,40 @@ static int stm32x_write_block(struct flash_bank *bank, const uint8_t *buffer,
return retval;
}
/** Writes a block to flash either using target algorithm
* or use fallback, host controlled halfword-by-halfword access.
* Flash controller must be unlocked before this call.
*/
static int stm32x_write_block(struct flash_bank *bank,
const uint8_t *buffer, uint32_t address, uint32_t hwords_count)
{
struct target *target = bank->target;
/* try using a block write - on ARM architecture or... */
int retval = stm32x_write_block_async(bank, buffer, address, hwords_count);
if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE) {
/* if block write failed (no sufficient working area),
* we use normal (slow) single halfword accesses */
LOG_WARNING("couldn't use block writes, falling back to single memory accesses");
while (hwords_count > 0) {
retval = target_write_memory(target, address, 2, 1, buffer);
if (retval != ERROR_OK)
return retval;
retval = stm32x_wait_status_busy(bank, 5);
if (retval != ERROR_OK)
return retval;
hwords_count--;
buffer += 2;
address += 2;
}
}
return retval;
}
static int stm32x_write(struct flash_bank *bank, const uint8_t *buffer,
uint32_t offset, uint32_t count)
{
@ -568,7 +604,6 @@ static int stm32x_write(struct flash_bank *bank, const uint8_t *buffer,
new_buffer[count++] = 0xff;
}
uint32_t words_remaining = count / 2;
int retval, retval2;
/* unlock flash registers */
@ -577,34 +612,15 @@ static int stm32x_write(struct flash_bank *bank, const uint8_t *buffer,
goto cleanup;
retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_KEYR), KEY2);
if (retval != ERROR_OK)
goto cleanup;
goto reset_pg_and_lock;
/* enable flash programming */
retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_CR), FLASH_PG);
if (retval != ERROR_OK)
goto cleanup;
goto reset_pg_and_lock;
/* try using a block write */
retval = stm32x_write_block(bank, buffer, bank->base + offset, words_remaining);
if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE) {
/* if block write failed (no sufficient working area),
* we use normal (slow) single halfword accesses */
LOG_WARNING("couldn't use block writes, falling back to single memory accesses");
while (words_remaining > 0) {
retval = target_write_memory(target, bank->base + offset, 2, 1, buffer);
if (retval != ERROR_OK)
goto reset_pg_and_lock;
retval = stm32x_wait_status_busy(bank, 5);
if (retval != ERROR_OK)
goto reset_pg_and_lock;
words_remaining--;
buffer += 2;
offset += 2;
}
}
/* write to flash */
retval = stm32x_write_block(bank, buffer, bank->base + offset, count / 2);
reset_pg_and_lock:
retval2 = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_CR), FLASH_LOCK);