--- /dev/null
+/***************************************************************************
+ * 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;
+}
projects / openocd / commitdiff