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- /***************************************************************************
- * Copyright (C) 2005 by Dominic Rath *
- * Dominic.Rath@gmx.de *
- * *
- * Copyright (C) 2008 by Spencer Oliver *
- * spen@spen-soft.co.uk *
- * *
- * Copyright (C) 2011 by Clement Burin des Roziers *
- * clement.burin-des-roziers@hikob.com *
- * *
- * This program is free software; you can redistribute it and/or modify *
- * it under the terms of the GNU General Public License as published by *
- * the Free Software Foundation; either version 2 of the License, or *
- * (at your option) any later version. *
- * *
- * This program is distributed in the hope that it will be useful, *
- * but WITHOUT ANY WARRANTY; without even the implied warranty of *
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
- * GNU General Public License for more details. *
- * *
- * You should have received a copy of the GNU General Public License *
- * along with this program; if not, write to the *
- * Free Software Foundation, Inc., *
- * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
- ***************************************************************************/
- #ifdef HAVE_CONFIG_H
- #include "config.h"
- #endif
-
- #include "imp.h"
- #include <helper/binarybuffer.h>
- #include <target/algorithm.h>
- #include <target/armv7m.h>
-
- /* stm32lx flash register locations */
-
- #define FLASH_BASE 0x40023C00
- #define FLASH_ACR 0x40023C00
- #define FLASH_PECR 0x40023C04
- #define FLASH_PDKEYR 0x40023C08
- #define FLASH_PEKEYR 0x40023C0C
- #define FLASH_PRGKEYR 0x40023C10
- #define FLASH_OPTKEYR 0x40023C14
- #define FLASH_SR 0x40023C18
- #define FLASH_OBR 0x40023C1C
- #define FLASH_WRPR 0x40023C20
-
- /* FLASH_ACR bites */
- #define FLASH_ACR__LATENCY (1<<0)
- #define FLASH_ACR__PRFTEN (1<<1)
- #define FLASH_ACR__ACC64 (1<<2)
- #define FLASH_ACR__SLEEP_PD (1<<3)
- #define FLASH_ACR__RUN_PD (1<<4)
-
- /* FLASH_PECR bits */
- #define FLASH_PECR__PELOCK (1<<0)
- #define FLASH_PECR__PRGLOCK (1<<1)
- #define FLASH_PECR__OPTLOCK (1<<2)
- #define FLASH_PECR__PROG (1<<3)
- #define FLASH_PECR__DATA (1<<4)
- #define FLASH_PECR__FTDW (1<<8)
- #define FLASH_PECR__ERASE (1<<9)
- #define FLASH_PECR__FPRG (1<<10)
- #define FLASH_PECR__EOPIE (1<<16)
- #define FLASH_PECR__ERRIE (1<<17)
- #define FLASH_PECR__OBL_LAUNCH (1<<18)
-
- /* FLASH_SR bits */
- #define FLASH_SR__BSY (1<<0)
- #define FLASH_SR__EOP (1<<1)
- #define FLASH_SR__ENDHV (1<<2)
- #define FLASH_SR__READY (1<<3)
- #define FLASH_SR__WRPERR (1<<8)
- #define FLASH_SR__PGAERR (1<<9)
- #define FLASH_SR__SIZERR (1<<10)
- #define FLASH_SR__OPTVERR (1<<11)
-
- /* Unlock keys */
- #define PEKEY1 0x89ABCDEF
- #define PEKEY2 0x02030405
- #define PRGKEY1 0x8C9DAEBF
- #define PRGKEY2 0x13141516
- #define OPTKEY1 0xFBEAD9C8
- #define OPTKEY2 0x24252627
-
- /* other registers */
- #define DBGMCU_IDCODE 0xE0042000
- #define F_SIZE 0x1FF8004C
-
- /* Constants */
- #define FLASH_PAGE_SIZE 256
- #define FLASH_SECTOR_SIZE 4096
- #define FLASH_PAGES_PER_SECTOR 16
- #define FLASH_BANK0_ADDRESS 0x08000000
-
- /* stm32lx option byte register location */
- #define OB_RDP 0x1FF80000
- #define OB_USER 0x1FF80004
- #define OB_WRP0_1 0x1FF80008
- #define OB_WRP2_3 0x1FF8000C
-
- /* OB_RDP values */
- #define OB_RDP__LEVEL0 0xFF5500AA
- #define OB_RDP__LEVEL1 0xFFFF0000
-
- /* stm32lx RCC register locations */
- #define RCC_CR 0x40023800
- #define RCC_ICSCR 0x40023804
- #define RCC_CFGR 0x40023808
-
- /* RCC_ICSCR bits */
- #define RCC_ICSCR__MSIRANGE_MASK (7<<13)
-
- static int stm32lx_unlock_program_memory(struct flash_bank *bank);
- static int stm32lx_lock_program_memory(struct flash_bank *bank);
- static int stm32lx_enable_write_half_page(struct flash_bank *bank);
- static int stm32lx_erase_sector(struct flash_bank *bank, int sector);
- static int stm32lx_wait_until_bsy_clear(struct flash_bank *bank);
-
- struct stm32lx_flash_bank
- {
- struct working_area *write_algorithm;
- int probed;
- };
-
- /* flash bank stm32lx <base> <size> 0 0 <target#>
- */
- FLASH_BANK_COMMAND_HANDLER(stm32lx_flash_bank_command)
- {
- struct stm32lx_flash_bank *stm32lx_info;
- if (CMD_ARGC < 6)
- {
- LOG_ERROR("incomplete flash_bank stm32lx configuration");
- return ERROR_FLASH_BANK_INVALID;
- }
-
- // Create the bank structure
- stm32lx_info = malloc(sizeof(struct stm32lx_flash_bank));
-
- // Check allocation
- if (stm32lx_info == NULL)
- {
- LOG_ERROR("failed to allocate bank structure");
- return ERROR_FAIL;
- }
-
- bank->driver_priv = stm32lx_info;
-
- stm32lx_info->write_algorithm = NULL;
- stm32lx_info->probed = 0;
-
- return ERROR_OK;
- }
-
- static int stm32lx_protect_check(struct flash_bank *bank)
- {
- int retval;
- struct target *target = bank->target;
-
- uint32_t wrpr;
-
- if (target->state != TARGET_HALTED)
- {
- LOG_ERROR("Target not halted");
- return ERROR_TARGET_NOT_HALTED;
- }
-
- /*
- * Read the WRPR word, and check each bit (corresponding to each
- * flash sector
- */
- retval = target_read_u32(target, FLASH_WRPR, &wrpr);
- if (retval != ERROR_OK)
- return retval;
-
- for (int i = 0; i < 32; i++)
- {
- if (wrpr & (1 << i))
- {
- bank->sectors[i].is_protected = 1;
- }
- else
- {
- bank->sectors[i].is_protected = 0;
- }
- }
- return ERROR_OK;
- }
-
- static int stm32lx_erase(struct flash_bank *bank, int first, int last)
- {
- int retval;
-
- /*
- * It could be possible to do a mass erase if all sectors must be
- * erased, but it is not implemented yet.
- */
-
- if (bank->target->state != TARGET_HALTED)
- {
- LOG_ERROR("Target not halted");
- return ERROR_TARGET_NOT_HALTED;
- }
-
- /*
- * Loop over the selected sectors and erase them
- */
- for (int i = first; i <= last; i++)
- {
- retval = stm32lx_erase_sector(bank, i);
- if (retval != ERROR_OK)
- return retval;
- bank->sectors[i].is_erased = 1;
- }
- return ERROR_OK;
- }
-
- static int stm32lx_protect(struct flash_bank *bank, int set, int first,
- int last)
- {
- LOG_WARNING("protection of the STM32L flash is not implemented");
- return ERROR_OK;
- }
-
- static int stm32lx_write_half_pages(struct flash_bank *bank, uint8_t *buffer,
- uint32_t offset, uint32_t count)
- {
- struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
- struct target *target = bank->target;
- uint32_t buffer_size = 4096 * 4;
- struct working_area *source;
- uint32_t address = bank->base + offset;
-
- struct reg_param reg_params[5];
- struct armv7m_algorithm armv7m_info;
-
- int retval = ERROR_OK;
- uint32_t reg32;
-
- /* see contib/loaders/flash/stm32lx.s for src */
-
- static const uint16_t stm32lx_flash_write_code_16[] =
- {
- // 00000000 <write_word-0x4>:
- 0x2300, // 0: 2300 movs r3, #0
- 0xe004, // 2: e004 b.n e <test_done>
-
- // 00000004 <write_word>:
- 0xf851, 0xcb04, // 4: f851 cb04 ldr.w ip, [r1], #4
- 0xf840, 0xcb04, // 8: f840 cb04 str.w ip, [r0], #4
- 0x3301, // c: 3301 adds r3, #1
-
- // 0000000e <test_done>:
- 0x4293, // e: 4293 cmp r3, r2
- 0xd3f8, // 10: d3f8 bcc.n 4 <write_word>
- 0xbe00, // 12: be00 bkpt 0x0000
-
- };
-
- // Flip endian
- uint8_t stm32lx_flash_write_code[sizeof(stm32lx_flash_write_code_16)];
- for (unsigned int i = 0; i < sizeof(stm32lx_flash_write_code_16) / 2; i++)
- {
- stm32lx_flash_write_code[i * 2 + 0] = stm32lx_flash_write_code_16[i]
- & 0xff;
- stm32lx_flash_write_code[i * 2 + 1] = (stm32lx_flash_write_code_16[i]
- >> 8) & 0xff;
- }
- // Check if there is an even number of half pages (128bytes)
- if (count % 128)
- {
- LOG_ERROR("there should be an even number "
- "of half pages = 128 bytes (count = %" PRIi32 " bytes)", count);
- return ERROR_FAIL;
- }
-
- // Allocate working area
- reg32 = sizeof(stm32lx_flash_write_code);
- // Add bytes to make 4byte aligned
- reg32 += (4 - (reg32 % 4)) % 4;
- retval = target_alloc_working_area(target, reg32,
- &stm32lx_info->write_algorithm);
- if (retval != ERROR_OK)
- return retval;
-
- // Write the flashing code
- retval = target_write_buffer(target,
- stm32lx_info->write_algorithm->address,
- sizeof(stm32lx_flash_write_code),
- (uint8_t*) stm32lx_flash_write_code);
- if (retval != ERROR_OK)
- {
- target_free_working_area(target, stm32lx_info->write_algorithm);
- return retval;
- }
-
- // Allocate half pages memory
- while (target_alloc_working_area_try(target, buffer_size, &source)
- != ERROR_OK)
- {
- if (buffer_size > 1024)
- buffer_size -= 1024;
- else
- buffer_size /= 2;
-
- if (buffer_size <= 256)
- {
- /* if we already allocated the writing code, but failed to get a
- * buffer, free the algorithm */
- if (stm32lx_info->write_algorithm)
- target_free_working_area(target, stm32lx_info->write_algorithm);
-
- LOG_WARNING("no large enough working area available, can't do block memory writes");
- return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
- }
- }
- LOG_DEBUG("allocated working area for data (%" PRIx32 " bytes)", buffer_size);
-
- armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
- armv7m_info.core_mode = ARMV7M_MODE_ANY;
- init_reg_param(®_params[0], "r0", 32, PARAM_OUT);
- init_reg_param(®_params[1], "r1", 32, PARAM_OUT);
- init_reg_param(®_params[2], "r2", 32, PARAM_OUT);
- init_reg_param(®_params[3], "r3", 32, PARAM_IN_OUT);
- init_reg_param(®_params[4], "r4", 32, PARAM_OUT);
-
- // Enable half-page write
- retval = stm32lx_enable_write_half_page(bank);
- if (retval != ERROR_OK)
- {
-
- target_free_working_area(target, source);
- target_free_working_area(target, stm32lx_info->write_algorithm);
-
- destroy_reg_param(®_params[0]);
- destroy_reg_param(®_params[1]);
- destroy_reg_param(®_params[2]);
- destroy_reg_param(®_params[3]);
-
- return retval;
- }
-
- // Loop while there are bytes to write
- while (count > 0)
- {
- uint32_t this_count;
- this_count = (count > buffer_size) ? buffer_size : count;
-
- // Write the next half pages
- retval = target_write_buffer(target, source->address, this_count,
- buffer);
- if (retval != ERROR_OK)
- break;
-
- // 4: Store useful information in the registers
- // the destination address of the copy (R0)
- buf_set_u32(reg_params[0].value, 0, 32, address);
- // The source address of the copy (R1)
- buf_set_u32(reg_params[1].value, 0, 32, source->address);
- // The length of the copy (R2)
- buf_set_u32(reg_params[2].value, 0, 32, this_count / 4);
-
- // 5: Execute the bunch of code
- retval = target_run_algorithm(target, 0, NULL, sizeof(reg_params)
- / sizeof(*reg_params), reg_params,
- stm32lx_info->write_algorithm->address, 0, 20000, &armv7m_info);
- if (retval != ERROR_OK)
- break;
-
- // 6: Wait while busy
- retval = stm32lx_wait_until_bsy_clear(bank);
- if (retval != ERROR_OK)
- break;
-
- buffer += this_count;
- address += this_count;
- count -= this_count;
- }
-
- if (retval == ERROR_OK)
- retval = stm32lx_lock_program_memory(bank);
-
- target_free_working_area(target, source);
- target_free_working_area(target, stm32lx_info->write_algorithm);
-
- destroy_reg_param(®_params[0]);
- destroy_reg_param(®_params[1]);
- destroy_reg_param(®_params[2]);
- destroy_reg_param(®_params[3]);
-
- return retval;
- }
- static int stm32lx_write(struct flash_bank *bank, uint8_t *buffer,
- uint32_t offset, uint32_t count)
- {
- struct target *target = bank->target;
-
- uint32_t halfpages_number;
- uint32_t words_remaining;
- uint32_t bytes_remaining;
- uint32_t address = bank->base + offset;
- uint32_t bytes_written = 0;
- int retval;
-
- if (bank->target->state != TARGET_HALTED)
- {
- LOG_ERROR("Target not halted");
- return ERROR_TARGET_NOT_HALTED;
- }
-
- if (offset & 0x1)
- {
- LOG_ERROR("offset 0x%" PRIx32 " breaks required 2-byte alignment", offset);
- return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
- }
-
- // Check if there are some full half pages
- if (((offset % 128) == 0) && (count >= 128))
- {
- halfpages_number = count / 128;
- words_remaining = (count - 128 * halfpages_number) / 4;
- bytes_remaining = (count & 0x3);
- }
- else
- {
- halfpages_number = 0;
- words_remaining = (count / 4);
- bytes_remaining = (count & 0x3);
- }
-
- if (halfpages_number)
- {
- retval = stm32lx_write_half_pages(bank, buffer, offset, 128
- * halfpages_number);
- if (retval != ERROR_OK)
- return ERROR_FAIL;
- }
-
- bytes_written = 128 * halfpages_number;
-
- retval = stm32lx_unlock_program_memory(bank);
- if (retval != ERROR_OK)
- return retval;
-
- while (words_remaining > 0)
- {
- uint32_t value;
- uint8_t* p = buffer + bytes_written;
-
- // Prepare the word, Little endian conversion
- value = p[0] + (p[1] << 8) + (p[2] << 16) + (p[3] << 24);
-
- retval = target_write_u32(target, address, value);
- if (retval != ERROR_OK)
- return retval;
-
- bytes_written += 4;
- words_remaining--;
- address += 4;
-
- retval = stm32lx_wait_until_bsy_clear(bank);
- if (retval != ERROR_OK)
- return retval;
- }
-
- if (bytes_remaining)
- {
- uint32_t value = 0;
- for (int i = 0; i < 4; i++)
- {
- if (bytes_remaining)
- {
- value += (buffer[i] << (8 * i));
- bytes_remaining--;
- }
- }
-
- retval = target_write_u32(target, address, value);
- if (retval != ERROR_OK)
- return retval;
-
- retval = stm32lx_wait_until_bsy_clear(bank);
- if (retval != ERROR_OK)
- return retval;
- }
-
- retval = stm32lx_lock_program_memory(bank);
- if (retval != ERROR_OK)
- return retval;
-
- return ERROR_OK;
- }
-
- static int stm32lx_probe(struct flash_bank *bank)
- {
- struct target *target = bank->target;
- struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
- int i;
- uint16_t flash_size;
- uint32_t device_id;
- uint32_t reg32;
-
- stm32lx_info->probed = 0;
-
- /* read stm32 device id register */
- int retval = target_read_u32(target, DBGMCU_IDCODE, &device_id);
- if (retval != ERROR_OK)
- return retval;
-
- LOG_DEBUG("device id = 0x%08" PRIx32 "", device_id);
-
- if ((device_id & 0x7ff) != 0x416)
- {
- LOG_WARNING("Cannot identify target as a STM32L family.");
- return ERROR_FAIL;
- }
-
- // Read the RDP byte and check if it is 0xAA
- uint8_t rdp;
- retval = target_read_u32(target, FLASH_OBR, ®32);
- if (retval != ERROR_OK)
- return retval;
- rdp = reg32 & 0xFF;
- if (rdp != 0xAA)
- {
- /*
- * Unlocking the option byte is done by unlocking the PECR, then
- * by writing the 2 option byte keys to OPTKEYR
- */
-
- /* To unlock the PECR write the 2 PEKEY to the PEKEYR register */
- retval = target_write_u32(target, FLASH_PEKEYR, PEKEY1);
- if (retval != ERROR_OK)
- return retval;
-
- retval = target_write_u32(target, FLASH_PEKEYR, PEKEY2);
- if (retval != ERROR_OK)
- return retval;
-
- /* Make sure it worked */
- retval = target_read_u32(target, FLASH_PECR, ®32);
- if (retval != ERROR_OK)
- return retval;
-
- if (reg32 & FLASH_PECR__PELOCK)
- return ERROR_FLASH_OPERATION_FAILED;
-
- retval = target_write_u32(target, FLASH_OPTKEYR, OPTKEY1);
- if (retval != ERROR_OK)
- return retval;
- retval = target_write_u32(target, FLASH_OPTKEYR, OPTKEY2);
- if (retval != ERROR_OK)
- return retval;
-
- retval = target_read_u32(target, FLASH_PECR, ®32);
- if (retval != ERROR_OK)
- return retval;
-
- if (reg32 & FLASH_PECR__OPTLOCK)
- {
- LOG_ERROR("OPTLOCK is not cleared");
- return ERROR_FLASH_OPERATION_FAILED;
- }
-
- // Then, write RDP to 0x00 to set level 1
- reg32 = ((~0xAA) << 16) | (0xAA);
- retval = target_write_u32(target, OB_RDP, reg32);
- if (retval != ERROR_OK)
- return retval;
-
- // Set Automatic update of the option byte, by setting OBL_LAUNCH in FLASH_PECR
- reg32 = FLASH_PECR__OBL_LAUNCH;
- retval = target_write_u32(target, FLASH_PECR, reg32);
- if (retval != ERROR_OK)
- return retval;
- }
-
- /* get flash size from target. */
- retval = target_read_u16(target, F_SIZE, &flash_size);
- if (retval != ERROR_OK)
- return retval;
-
- /* check for valid flash size */
- if (flash_size == 0xffff)
- {
- /* number of sectors incorrect on revA */
- LOG_ERROR("STM32 flash size failed, probe inaccurate");
- return ERROR_FAIL;
- }
-
- /* STM32L - we have 32 sectors, 16 pages per sector -> 512 pages
- * 16 pages for a protection area */
-
- /* calculate numbers of sectors (4kB per sector) */
- int num_sectors = (flash_size * 1024) / FLASH_SECTOR_SIZE;
- LOG_INFO("flash size = %dkbytes", flash_size);
-
- if (bank->sectors)
- {
- free(bank->sectors);
- bank->sectors = NULL;
- }
-
- bank->base = FLASH_BANK0_ADDRESS;
- bank->size = flash_size * 1024;
- bank->num_sectors = num_sectors;
- bank->sectors = malloc(sizeof(struct flash_sector) * num_sectors);
- if (bank->sectors == NULL)
- {
- LOG_ERROR("failed to allocate bank sectors");
- return ERROR_FAIL;
- }
-
- for (i = 0; i < num_sectors; i++)
- {
- bank->sectors[i].offset = i * FLASH_SECTOR_SIZE;
- bank->sectors[i].size = FLASH_SECTOR_SIZE;
- bank->sectors[i].is_erased = -1;
- bank->sectors[i].is_protected = 1;
- }
-
- stm32lx_info->probed = 1;
-
- return ERROR_OK;
- }
-
- static int stm32lx_auto_probe(struct flash_bank *bank)
- {
- struct stm32lx_flash_bank *stm32lx_info = bank->driver_priv;
-
- if (stm32lx_info->probed)
- {
- return ERROR_OK;
- }
-
- return stm32lx_probe(bank);
- }
-
- static int stm32lx_erase_check(struct flash_bank *bank)
- {
- struct target *target = bank->target;
- const int buffer_size = 4096;
- int i;
- uint32_t nBytes;
- int retval = ERROR_OK;
-
- if (bank->target->state != TARGET_HALTED)
- {
- LOG_ERROR("Target not halted");
- return ERROR_TARGET_NOT_HALTED;
- }
-
- uint8_t *buffer = malloc(buffer_size);
- if (buffer == NULL)
- {
- LOG_ERROR("failed to allocate read buffer");
- return ERROR_FAIL;
- }
-
- for (i = 0; i < bank->num_sectors; i++)
- {
- uint32_t j;
- bank->sectors[i].is_erased = 1;
-
- // Loop chunk by chunk over the sector
- for (j = 0; j < bank->sectors[i].size; j += buffer_size)
- {
- uint32_t chunk;
- chunk = buffer_size;
- if (chunk > (j - bank->sectors[i].size))
- {
- chunk = (j - bank->sectors[i].size);
- }
-
- retval = target_read_memory(target, bank->base
- + bank->sectors[i].offset + j, 4, chunk / 4, buffer);
- if (retval != ERROR_OK)
- break;
-
- for (nBytes = 0; nBytes < chunk; nBytes++)
- {
- if (buffer[nBytes] != 0x00)
- {
- bank->sectors[i].is_erased = 0;
- break;
- }
- }
- }
- if (retval != ERROR_OK)
- {
- break;
- }
- }
- free(buffer);
-
- return retval;
- }
- static int stm32lx_get_info(struct flash_bank *bank, char *buf, int buf_size)
- {
- // This method must return a string displaying information about the bank
-
- struct target *target = bank->target;
- uint32_t device_id;
- int printed;
-
- /* read stm32 device id register */
- int retval = target_read_u32(target, DBGMCU_IDCODE, &device_id);
- if (retval != ERROR_OK)
- return retval;
-
- if ((device_id & 0x7ff) == 0x416)
- {
- printed = snprintf(buf, buf_size, "stm32lx - Rev: ");
- buf += printed;
- buf_size -= printed;
-
- switch (device_id >> 16)
- {
- case 0x1000:
- snprintf(buf, buf_size, "A");
- break;
-
- case 0x1008:
- snprintf(buf, buf_size, "Y");
- break;
- default:
- snprintf(buf, buf_size, "unknown");
- break;
- }
- }
- else
- {
- snprintf(buf, buf_size, "Cannot identify target as a stm32lx");
- return ERROR_FAIL;
- }
-
- return ERROR_OK;
- }
-
- static const struct command_registration stm32lx_exec_command_handlers[] =
- {
- COMMAND_REGISTRATION_DONE
- };
-
- static const struct command_registration stm32lx_command_handlers[] =
- {
- {
- .name = "stm32lx",
- .mode = COMMAND_ANY,
- .help = "stm32lx flash command group",
- .chain = stm32lx_exec_command_handlers,
- },
- COMMAND_REGISTRATION_DONE
- };
-
- struct flash_driver stm32lx_flash =
- {
- .name = "stm32lx",
- .commands = stm32lx_command_handlers,
- .flash_bank_command = stm32lx_flash_bank_command,
- .erase = stm32lx_erase,
- .protect = stm32lx_protect,
- .write = stm32lx_write,
- .read = default_flash_read,
- .probe = stm32lx_probe,
- .auto_probe = stm32lx_auto_probe,
- .erase_check = stm32lx_erase_check,
- .protect_check = stm32lx_protect_check,
- .info = stm32lx_get_info,
- };
-
- // Static methods implementation
-
- static int stm32lx_unlock_program_memory(struct flash_bank *bank)
- {
- struct target *target = bank->target;
- int retval;
- uint32_t reg32;
-
- /*
- * Unlocking the program memory is done by unlocking the PECR,
- * then by writing the 2 PRGKEY to the PRGKEYR register
- */
-
- /* To unlock the PECR write the 2 PEKEY to the PEKEYR register */
- retval = target_write_u32(target, FLASH_PEKEYR, PEKEY1);
- if (retval != ERROR_OK)
- return retval;
-
- retval = target_write_u32(target, FLASH_PEKEYR, PEKEY2);
- if (retval != ERROR_OK)
- return retval;
-
- /* Make sure it worked */
- retval = target_read_u32(target, FLASH_PECR, ®32);
- if (retval != ERROR_OK)
- return retval;
-
- if (reg32 & FLASH_PECR__PELOCK)
- {
- LOG_ERROR("PELOCK is not cleared :(");
- return ERROR_FLASH_OPERATION_FAILED;
- }
-
- retval = target_write_u32(target, FLASH_PRGKEYR, PRGKEY1);
- if (retval != ERROR_OK)
- return retval;
- retval = target_write_u32(target, FLASH_PRGKEYR, PRGKEY2);
- if (retval != ERROR_OK)
- return retval;
-
- /* Make sure it worked */
- retval = target_read_u32(target, FLASH_PECR, ®32);
- if (retval != ERROR_OK)
- return retval;
-
- if (reg32 & FLASH_PECR__PRGLOCK)
- {
- LOG_ERROR("PRGLOCK is not cleared :(");
- return ERROR_FLASH_OPERATION_FAILED;
- }
- return ERROR_OK;
- }
-
- static int stm32lx_enable_write_half_page(struct flash_bank *bank)
- {
- struct target *target = bank->target;
- int retval;
- uint32_t reg32;
-
- /**
- * Unlock the program memory, then set the FPRG bit in the PECR register.
- */
- retval = stm32lx_unlock_program_memory(bank);
- if (retval != ERROR_OK)
- return retval;
-
- retval = target_read_u32(target, FLASH_PECR, ®32);
- if (retval != ERROR_OK)
- return retval;
-
- reg32 |= FLASH_PECR__FPRG;
- retval = target_write_u32(target, FLASH_PECR, reg32);
- if (retval != ERROR_OK)
- return retval;
-
- retval = target_read_u32(target, FLASH_PECR, ®32);
- if (retval != ERROR_OK)
- return retval;
-
- reg32 |= FLASH_PECR__PROG;
- retval = target_write_u32(target, FLASH_PECR, reg32);
-
- return retval;
- }
-
- static int stm32lx_lock_program_memory(struct flash_bank *bank)
- {
- struct target *target = bank->target;
- int retval;
- uint32_t reg32;
-
- /* To lock the program memory, simply set the lock bit and lock PECR */
-
- retval = target_read_u32(target, FLASH_PECR, ®32);
- if (retval != ERROR_OK)
- return retval;
-
- reg32 |= FLASH_PECR__PRGLOCK;
- retval = target_write_u32(target, FLASH_PECR, reg32);
- if (retval != ERROR_OK)
- return retval;
-
- retval = target_read_u32(target, FLASH_PECR, ®32);
- if (retval != ERROR_OK)
- return retval;
-
- reg32 |= FLASH_PECR__PELOCK;
- retval = target_write_u32(target, FLASH_PECR, reg32);
- if (retval != ERROR_OK)
- return retval;
-
- return ERROR_OK;
- }
-
- static int stm32lx_erase_sector(struct flash_bank *bank, int sector)
- {
- struct target *target = bank->target;
- int retval;
- uint32_t reg32;
-
- /*
- * To erase a sector (i.e. FLASH_PAGES_PER_SECTOR pages),
- * first unlock the memory, loop over the pages of this sector
- * and write 0x0 to its first word.
- */
-
- retval = stm32lx_unlock_program_memory(bank);
- if (retval != ERROR_OK)
- return retval;
-
- for (int page = 0; page < FLASH_PAGES_PER_SECTOR; page++)
- {
- reg32 = FLASH_PECR__PROG | FLASH_PECR__ERASE;
- retval = target_write_u32(target, FLASH_PECR, reg32);
- if (retval != ERROR_OK)
- return retval;
-
- retval = stm32lx_wait_until_bsy_clear(bank);
- if (retval != ERROR_OK)
- return retval;
-
- uint32_t addr = bank->base + bank->sectors[sector].offset + (page
- * FLASH_PAGE_SIZE);
- retval = target_write_u32(target, addr, 0x0);
- if (retval != ERROR_OK)
- return retval;
-
- retval = stm32lx_wait_until_bsy_clear(bank);
- if (retval != ERROR_OK)
- return retval;
- }
-
- retval = stm32lx_lock_program_memory(bank);
- if (retval != ERROR_OK)
- return retval;
-
- return ERROR_OK;
- }
-
- static int stm32lx_wait_until_bsy_clear(struct flash_bank *bank)
- {
- struct target *target = bank->target;
- uint32_t status;
- int retval = ERROR_OK;
- int timeout = 100;
-
- /* wait for busy to clear */
- for (;;)
- {
- retval = target_read_u32(target, FLASH_SR, &status);
- if (retval != ERROR_OK)
- return retval;
-
- if ((status & FLASH_SR__BSY) == 0)
- {
- break;
- }
- if (timeout-- <= 0)
- {
- LOG_ERROR("timed out waiting for flash");
- return ERROR_FAIL;
- }
- alive_sleep(1);
- }
-
- if (status & FLASH_SR__WRPERR)
- {
- LOG_ERROR("access denied / write protected");
- retval = ERROR_FAIL;
- }
-
- if (status & FLASH_SR__PGAERR)
- {
- LOG_ERROR("invalid program address");
- retval = ERROR_FAIL;
- }
-
- return retval;
- }
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