From e774df7f69568c63388a041c1ce5bf0cf95172e1 Mon Sep 17 00:00:00 2001 From: Øyvind Harboe Date: Mon, 8 Nov 2010 16:02:07 +0100 Subject: stm32: sharpen error handling for timeouts MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit delete lots of crud by handling this all in one spot. Signed-off-by: Øyvind Harboe --- src/flash/nor/stm32x.c | 177 +++++++++++++++++++------------------------------ 1 file changed, 69 insertions(+), 108 deletions(-) (limited to 'src') diff --git a/src/flash/nor/stm32x.c b/src/flash/nor/stm32x.c index 5b31b042..9decac27 100644 --- a/src/flash/nor/stm32x.c +++ b/src/flash/nor/stm32x.c @@ -54,33 +54,56 @@ FLASH_BANK_COMMAND_HANDLER(stm32x_flash_bank_command) return ERROR_OK; } -static uint32_t stm32x_get_flash_status(struct flash_bank *bank) +static int stm32x_get_flash_status(struct flash_bank *bank, uint32_t *status) { struct target *target = bank->target; - uint32_t status; - - target_read_u32(target, STM32_FLASH_SR, &status); - - return status; + return target_read_u32(target, STM32_FLASH_SR, status); } -static uint32_t stm32x_wait_status_busy(struct flash_bank *bank, int timeout) +static int stm32x_wait_status_busy(struct flash_bank *bank, int timeout) { struct target *target = bank->target; uint32_t status; + int retval = ERROR_OK; /* wait for busy to clear */ - while (((status = stm32x_get_flash_status(bank)) & FLASH_BSY) && (timeout-- > 0)) + for (;;) { + retval = stm32x_get_flash_status(bank, &status); + if (retval != ERROR_OK) + return retval; LOG_DEBUG("status: 0x%" PRIx32 "", status); + if ((status & FLASH_BSY) == 0) + break; + if (timeout-- <= 0) + { + LOG_ERROR("timed out waiting for flash"); + return ERROR_FAIL; + } alive_sleep(1); } + + if (status & FLASH_WRPRTERR) + { + LOG_ERROR("stm32x device protected"); + retval = ERROR_FAIL; + } + + if (status & FLASH_PGERR) + { + LOG_ERROR("stm32x device programming failed"); + retval = ERROR_FAIL; + } + /* Clear but report errors */ if (status & (FLASH_WRPRTERR | FLASH_PGERR)) { + /* If this operation fails, we ignore it and report the original + * retval + */ target_write_u32(target, STM32_FLASH_SR, FLASH_WRPRTERR | FLASH_PGERR); } - return status; + return retval; } static int stm32x_read_options(struct flash_bank *bank) @@ -115,7 +138,6 @@ static int stm32x_erase_options(struct flash_bank *bank) { struct stm32x_flash_bank *stm32x_info = NULL; struct target *target = bank->target; - uint32_t status; stm32x_info = bank->driver_priv; @@ -134,12 +156,9 @@ static int stm32x_erase_options(struct flash_bank *bank) target_write_u32(target, STM32_FLASH_CR, FLASH_OPTER | FLASH_OPTWRE); target_write_u32(target, STM32_FLASH_CR, FLASH_OPTER | FLASH_STRT | FLASH_OPTWRE); - status = stm32x_wait_status_busy(bank, 10); - - if (status & FLASH_WRPRTERR) - return ERROR_FLASH_OPERATION_FAILED; - if (status & FLASH_PGERR) - return ERROR_FLASH_OPERATION_FAILED; + int retval = stm32x_wait_status_busy(bank, 10); + if (retval != ERROR_OK) + return retval; /* clear readout protection and complementary option bytes * this will also force a device unlock if set */ @@ -152,7 +171,6 @@ static int stm32x_write_options(struct flash_bank *bank) { struct stm32x_flash_bank *stm32x_info = NULL; struct target *target = bank->target; - uint32_t status; stm32x_info = bank->driver_priv; @@ -170,62 +188,44 @@ static int stm32x_write_options(struct flash_bank *bank) /* write user option byte */ target_write_u16(target, STM32_OB_USER, stm32x_info->option_bytes.user_options); - status = stm32x_wait_status_busy(bank, 10); - - if (status & FLASH_WRPRTERR) - return ERROR_FLASH_OPERATION_FAILED; - if (status & FLASH_PGERR) - return ERROR_FLASH_OPERATION_FAILED; + int retval = stm32x_wait_status_busy(bank, 10); + if (retval != ERROR_OK) + return retval; /* write protection byte 1 */ target_write_u16(target, STM32_OB_WRP0, stm32x_info->option_bytes.protection[0]); - status = stm32x_wait_status_busy(bank, 10); - - if (status & FLASH_WRPRTERR) - return ERROR_FLASH_OPERATION_FAILED; - if (status & FLASH_PGERR) - return ERROR_FLASH_OPERATION_FAILED; + retval = stm32x_wait_status_busy(bank, 10); + if (retval != ERROR_OK) + return retval; /* write protection byte 2 */ target_write_u16(target, STM32_OB_WRP1, stm32x_info->option_bytes.protection[1]); - status = stm32x_wait_status_busy(bank, 10); - - if (status & FLASH_WRPRTERR) - return ERROR_FLASH_OPERATION_FAILED; - if (status & FLASH_PGERR) - return ERROR_FLASH_OPERATION_FAILED; + retval = stm32x_wait_status_busy(bank, 10); + if (retval != ERROR_OK) + return retval; /* write protection byte 3 */ target_write_u16(target, STM32_OB_WRP2, stm32x_info->option_bytes.protection[2]); - status = stm32x_wait_status_busy(bank, 10); - - if (status & FLASH_WRPRTERR) - return ERROR_FLASH_OPERATION_FAILED; - if (status & FLASH_PGERR) - return ERROR_FLASH_OPERATION_FAILED; + retval = stm32x_wait_status_busy(bank, 10); + if (retval != ERROR_OK) + return retval; /* write protection byte 4 */ target_write_u16(target, STM32_OB_WRP3, stm32x_info->option_bytes.protection[3]); - status = stm32x_wait_status_busy(bank, 10); - - if (status & FLASH_WRPRTERR) - return ERROR_FLASH_OPERATION_FAILED; - if (status & FLASH_PGERR) - return ERROR_FLASH_OPERATION_FAILED; + retval = stm32x_wait_status_busy(bank, 10); + if (retval != ERROR_OK) + return retval; /* write readout protection bit */ target_write_u16(target, STM32_OB_RDP, stm32x_info->option_bytes.RDP); - status = stm32x_wait_status_busy(bank, 10); - - if (status & FLASH_WRPRTERR) - return ERROR_FLASH_OPERATION_FAILED; - if (status & FLASH_PGERR) - return ERROR_FLASH_OPERATION_FAILED; + retval = stm32x_wait_status_busy(bank, 10); + if (retval != ERROR_OK) + return retval; target_write_u32(target, STM32_FLASH_CR, FLASH_LOCK); @@ -308,7 +308,6 @@ static int stm32x_erase(struct flash_bank *bank, int first, int last) { struct target *target = bank->target; int i; - uint32_t status; if (bank->target->state != TARGET_HALTED) { @@ -331,12 +330,10 @@ static int stm32x_erase(struct flash_bank *bank, int first, int last) target_write_u32(target, STM32_FLASH_AR, bank->base + bank->sectors[i].offset); target_write_u32(target, STM32_FLASH_CR, FLASH_PER | FLASH_STRT); - status = stm32x_wait_status_busy(bank, 100); + int retval = stm32x_wait_status_busy(bank, 100); + if (retval != ERROR_OK) + return retval; - if (status & FLASH_WRPRTERR) - return ERROR_FLASH_OPERATION_FAILED; - if (status & FLASH_PGERR) - return ERROR_FLASH_OPERATION_FAILED; bank->sectors[i].is_erased = 1; } @@ -526,7 +523,6 @@ static int stm32x_write_block(struct flash_bank *bank, uint8_t *buffer, 10000, &armv7m_info)) != ERROR_OK) { LOG_ERROR("error executing stm32x flash write algorithm"); - retval = ERROR_FLASH_OPERATION_FAILED; break; } @@ -535,7 +531,7 @@ static int stm32x_write_block(struct flash_bank *bank, uint8_t *buffer, LOG_ERROR("flash memory not erased before writing"); /* Clear but report errors */ target_write_u32(target, STM32_FLASH_SR, FLASH_PGERR); - retval = ERROR_FLASH_OPERATION_FAILED; + retval = ERROR_FAIL; break; } @@ -544,7 +540,7 @@ static int stm32x_write_block(struct flash_bank *bank, uint8_t *buffer, LOG_ERROR("flash memory write protected"); /* Clear but report errors */ target_write_u32(target, STM32_FLASH_SR, FLASH_WRPRTERR); - retval = ERROR_FLASH_OPERATION_FAILED; + retval = ERROR_FAIL; break; } @@ -572,7 +568,6 @@ static int stm32x_write(struct flash_bank *bank, uint8_t *buffer, uint32_t bytes_remaining = (count & 0x00000001); uint32_t address = bank->base + offset; uint32_t bytes_written = 0; - uint8_t status; int retval; if (bank->target->state != TARGET_HALTED) @@ -603,11 +598,6 @@ static int stm32x_write(struct flash_bank *bank, uint8_t *buffer, * we use normal (slow) single dword accesses */ LOG_WARNING("couldn't use block writes, falling back to single memory accesses"); } - else if (retval == ERROR_FLASH_OPERATION_FAILED) - { - LOG_ERROR("flash writing failed with error code: 0x%x", retval); - return ERROR_FLASH_OPERATION_FAILED; - } } else { @@ -625,18 +615,9 @@ static int stm32x_write(struct flash_bank *bank, uint8_t *buffer, target_write_u32(target, STM32_FLASH_CR, FLASH_PG); target_write_u16(target, address, value); - status = stm32x_wait_status_busy(bank, 5); - - if (status & FLASH_WRPRTERR) - { - LOG_ERROR("flash memory not erased before writing"); - return ERROR_FLASH_OPERATION_FAILED; - } - if (status & FLASH_PGERR) - { - LOG_ERROR("flash memory write protected"); - return ERROR_FLASH_OPERATION_FAILED; - } + retval = stm32x_wait_status_busy(bank, 5); + if (retval != ERROR_OK) + return retval; bytes_written += 2; words_remaining--; @@ -651,18 +632,9 @@ static int stm32x_write(struct flash_bank *bank, uint8_t *buffer, target_write_u32(target, STM32_FLASH_CR, FLASH_PG); target_write_u16(target, address, value); - status = stm32x_wait_status_busy(bank, 5); - - if (status & FLASH_WRPRTERR) - { - LOG_ERROR("flash memory not erased before writing"); - return ERROR_FLASH_OPERATION_FAILED; - } - if (status & FLASH_PGERR) - { - LOG_ERROR("flash memory write protected"); - return ERROR_FLASH_OPERATION_FAILED; - } + retval = stm32x_wait_status_busy(bank, 5); + if (retval != ERROR_OK) + return retval; } target_write_u32(target, STM32_FLASH_CR, FLASH_LOCK); @@ -770,7 +742,7 @@ static int stm32x_probe(struct flash_bank *bank) else { LOG_WARNING("Cannot identify target as a STM32 family."); - return ERROR_FLASH_OPERATION_FAILED; + return ERROR_FAIL; } LOG_INFO("flash size = %dkbytes", num_pages); @@ -938,7 +910,7 @@ static int get_stm32x_info(struct flash_bank *bank, char *buf, int buf_size) else { snprintf(buf, buf_size, "Cannot identify target as a stm32x\n"); - return ERROR_FLASH_OPERATION_FAILED; + return ERROR_FAIL; } return ERROR_OK; @@ -1176,7 +1148,6 @@ COMMAND_HANDLER(stm32x_handle_options_write_command) static int stm32x_mass_erase(struct flash_bank *bank) { struct target *target = bank->target; - uint32_t status; if (target->state != TARGET_HALTED) { @@ -1192,22 +1163,12 @@ static int stm32x_mass_erase(struct flash_bank *bank) target_write_u32(target, STM32_FLASH_CR, FLASH_MER); target_write_u32(target, STM32_FLASH_CR, FLASH_MER | FLASH_STRT); - status = stm32x_wait_status_busy(bank, 100); + int retval = stm32x_wait_status_busy(bank, 100); + if (retval != ERROR_OK) + return retval; target_write_u32(target, STM32_FLASH_CR, FLASH_LOCK); - if (status & FLASH_WRPRTERR) - { - LOG_ERROR("stm32x device protected"); - return ERROR_FLASH_OPERATION_FAILED; - } - - if (status & FLASH_PGERR) - { - LOG_ERROR("stm32x device programming failed"); - return ERROR_FLASH_OPERATION_FAILED; - } - return ERROR_OK; } -- cgit v1.2.3