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openocd/src/flash/nor/stm32lx.c

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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., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
***************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "imp.h"
#include <helper/binarybuffer.h>
#include <target/algorithm.h>
#include <target/armv7m.h>
#include <target/cortex_m.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 {
int probed;
bool has_dual_banks;
uint32_t user_bank_size;
};
/* 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)
return ERROR_COMMAND_SYNTAX_ERROR;
/* 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->probed = 0;
stm32lx_info->has_dual_banks = false;
stm32lx_info->user_bank_size = bank->size;
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 target *target = bank->target;
uint32_t buffer_size = 16384;
struct working_area *write_algorithm;
struct working_area *source;
uint32_t address = bank->base + offset;
struct reg_param reg_params[3];
struct armv7m_algorithm armv7m_info;
int retval = ERROR_OK;
/* see contib/loaders/flash/stm32lx.S for src */
static const uint8_t stm32lx_flash_write_code[] = {
/* write_word: */
0x00, 0x23, /* movs r3, #0 */
0x04, 0xe0, /* b test_done */
/* write_word: */
0x51, 0xf8, 0x04, 0xcb, /* ldr ip, [r1], #4 */
0x40, 0xf8, 0x04, 0xcb, /* str ip, [r0], #4 */
0x01, 0x33, /* adds r3, #1 */
/* test_done: */
0x93, 0x42, /* cmp r3, r2 */
0xf8, 0xd3, /* bcc write_word */
0x00, 0xbe, /* bkpt 0 */
};
/* 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;
}
/* flash write code */
if (target_alloc_working_area(target, sizeof(stm32lx_flash_write_code),
&write_algorithm) != ERROR_OK) {
LOG_DEBUG("no working area for block memory writes");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
};
/* Write the flashing code */
retval = target_write_buffer(target,
write_algorithm->address,
sizeof(stm32lx_flash_write_code),
(uint8_t *)stm32lx_flash_write_code);
if (retval != ERROR_OK) {
target_free_working_area(target, 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) {
/* we already allocated the writing code, but failed to get a
* buffer, free the algorithm */
target_free_working_area(target, write_algorithm);
LOG_WARNING("no large enough working area available, can't do block memory writes");
return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
}
}
armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
armv7m_info.core_mode = ARM_MODE_THREAD;
init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
init_reg_param(&reg_params[2], "r2", 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, write_algorithm);
destroy_reg_param(&reg_params[0]);
destroy_reg_param(&reg_params[1]);
destroy_reg_param(&reg_params[2]);
return retval;
}
struct armv7m_common *armv7m = target_to_armv7m(target);
if (armv7m == NULL) {
/* something is very wrong if armv7m is NULL */
LOG_ERROR("unable to get armv7m target");
return retval;
}
/* save any DEMCR flags and configure target to catch any Hard Faults */
uint32_t demcr_save = armv7m->demcr;
armv7m->demcr = VC_HARDERR;
/* 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,
write_algorithm->address, 0, 10000, &armv7m_info);
if (retval != ERROR_OK)
break;
/* check for Hard Fault */
if (armv7m->exception_number == 3)
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;
}
/* restore previous flags */
armv7m->demcr = demcr_save;
if (armv7m->exception_number == 3) {
/* the stm32l15x devices seem to have an issue when blank.
* if a ram loader is executed on a blank device it will
* Hard Fault, this issue does not happen for a already programmed device.
* A related issue is described in the stm32l151xx errata (Doc ID 17721 Rev 6 - 2.1.3).
* The workaround of handling the Hard Fault exception does work, but makes the
* loader more complicated, as a compromise we manually write the pages, programming time
* is reduced by 50% using this slower method.
*/
LOG_WARNING("couldn't use loader, falling back to page memory writes");
while (count > 0) {
uint32_t this_count;
this_count = (count > 128) ? 128 : count;
/* Write the next half pages */
retval = target_write_buffer(target, address, this_count, buffer);
if (retval != ERROR_OK)
break;
/* 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, write_algorithm);
destroy_reg_param(&reg_params[0]);
destroy_reg_param(&reg_params[1]);
destroy_reg_param(&reg_params[2]);
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 bytes_remaining = 0;
uint32_t address = bank->base + offset;
uint32_t bytes_written = 0;
int retval, retval2;
if (bank->target->state != TARGET_HALTED) {
LOG_ERROR("Target not halted");
return ERROR_TARGET_NOT_HALTED;
}
if (offset & 0x3) {
LOG_ERROR("offset 0x%" PRIx32 " breaks required 4-byte alignment", offset);
return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
}
retval = stm32lx_unlock_program_memory(bank);
if (retval != ERROR_OK)
return retval;
/* first we need to write any unaligned head bytes upto
* the next 128 byte page */
if (offset % 128)
bytes_remaining = MIN(count, 128 - (offset % 128));
while (bytes_remaining > 0) {
uint8_t value[4] = {0xff, 0xff, 0xff, 0xff};
/* copy remaining bytes into the write buffer */
uint32_t bytes_to_write = MIN(4, bytes_remaining);
memcpy(value, buffer + bytes_written, bytes_to_write);
retval = target_write_buffer(target, address, 4, value);
if (retval != ERROR_OK)
goto reset_pg_and_lock;
bytes_written += bytes_to_write;
bytes_remaining -= bytes_to_write;
address += 4;
retval = stm32lx_wait_until_bsy_clear(bank);
if (retval != ERROR_OK)
goto reset_pg_and_lock;
}
offset += bytes_written;
count -= bytes_written;
/* this should always pass this check here */
assert((offset % 128) == 0);
/* calculate half pages */
halfpages_number = count / 128;
if (halfpages_number) {
retval = stm32lx_write_half_pages(bank, buffer + bytes_written, offset, 128 * halfpages_number);
if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE) {
/* attempt slow memory writes */
LOG_WARNING("couldn't use block writes, falling back to single memory accesses");
halfpages_number = 0;
} else {
if (retval != ERROR_OK)
return ERROR_FAIL;
}
}
/* write any remaining bytes */
uint32_t page_bytes_written = 128 * halfpages_number;
bytes_written += page_bytes_written;
address += page_bytes_written;
bytes_remaining = count - page_bytes_written;
retval = stm32lx_unlock_program_memory(bank);
if (retval != ERROR_OK)
return retval;
while (bytes_remaining > 0) {
uint8_t value[4] = {0xff, 0xff, 0xff, 0xff};
/* copy remaining bytes into the write buffer */
uint32_t bytes_to_write = MIN(4, bytes_remaining);
memcpy(value, buffer + bytes_written, bytes_to_write);
retval = target_write_buffer(target, address, 4, value);
if (retval != ERROR_OK)
goto reset_pg_and_lock;
bytes_written += bytes_to_write;
bytes_remaining -= bytes_to_write;
address += 4;
retval = stm32lx_wait_until_bsy_clear(bank);
if (retval != ERROR_OK)
goto reset_pg_and_lock;
}
reset_pg_and_lock:
retval2 = stm32lx_lock_program_memory(bank);
if (retval == ERROR_OK)
retval = retval2;
return retval;
}
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_in_kb;
uint16_t max_flash_size_in_kb;
uint32_t device_id;
uint32_t base_address = FLASH_BANK0_ADDRESS;
uint32_t second_bank_base;
uint32_t first_bank_size_in_kb;
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);
/* set max flash size depending on family */
switch (device_id & 0xfff) {
case 0x416:
max_flash_size_in_kb = 128;
break;
case 0x427:
/* single bank, high density */
max_flash_size_in_kb = 256;
break;
case 0x436:
/* According to ST, the devices with id 0x436 have dual bank flash and comes with
* a total flash size of 384k or 256kb. However, the first bank is always 192kb,
* and second one holds the rest. The reason is that the 256kb version is actually
* the same physical flash but only the first 256kb are verified.
*/
max_flash_size_in_kb = 384;
first_bank_size_in_kb = 192;
stm32lx_info->has_dual_banks = true;
break;
default:
LOG_WARNING("Cannot identify target as a STM32L family.");
return ERROR_FAIL;
}
/* Get the flash size from target. */
retval = target_read_u16(target, F_SIZE, &flash_size_in_kb);
/* Failed reading flash size or flash size invalid (early silicon),
* default to max target family */
if (retval != ERROR_OK || flash_size_in_kb == 0xffff || flash_size_in_kb == 0) {
LOG_WARNING("STM32L flash size failed, probe inaccurate - assuming %dk flash",
max_flash_size_in_kb);
flash_size_in_kb = max_flash_size_in_kb;
} else if (flash_size_in_kb > max_flash_size_in_kb) {
LOG_WARNING("STM32L probed flash size assumed incorrect since FLASH_SIZE=%dk > %dk, - assuming %dk flash",
flash_size_in_kb, max_flash_size_in_kb, max_flash_size_in_kb);
flash_size_in_kb = max_flash_size_in_kb;
}
if (stm32lx_info->has_dual_banks) {
/* Use the configured base address to determine if this is the first or second flash bank.
* Verify that the base address is reasonably correct and determine the flash bank size
*/
second_bank_base = base_address + first_bank_size_in_kb * 1024;
if (bank->base == second_bank_base) {
/* This is the second bank */
base_address = second_bank_base;
flash_size_in_kb = flash_size_in_kb - first_bank_size_in_kb;
} else if (bank->base == 0 || bank->base == base_address) {
/* This is the first bank */
flash_size_in_kb = first_bank_size_in_kb;
} else {
LOG_WARNING("STM32L flash bank base address config is incorrect. 0x%x but should rather be 0x%x or 0x%x",
bank->base, base_address, second_bank_base);
return ERROR_FAIL;
}
LOG_INFO("STM32L flash has dual banks. Bank (%d) size is %dkb, base address is 0x%x",
bank->bank_number, flash_size_in_kb, base_address);
} else {
LOG_INFO("STM32L flash size is %dkb, base address is 0x%x", flash_size_in_kb, base_address);
}
/* if the user sets the size manually then ignore the probed value
* this allows us to work around devices that have a invalid flash size register value */
if (stm32lx_info->user_bank_size) {
flash_size_in_kb = stm32lx_info->user_bank_size / 1024;
LOG_INFO("ignoring flash probed value, using configured bank size: %dkbytes", flash_size_in_kb);
}
/* 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_in_kb * 1024) / FLASH_SECTOR_SIZE;
if (bank->sectors) {
free(bank->sectors);
bank->sectors = NULL;
}
bank->size = flash_size_in_kb * 1024;
bank->base = base_address;
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 & 0xfff) == 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;
case 0x1018:
snprintf(buf, buf_size, "X");
break;
case 0x1038:
snprintf(buf, buf_size, "W");
break;
case 0x1078:
snprintf(buf, buf_size, "V");
break;
default:
snprintf(buf, buf_size, "unknown");
break;
}
} else if ((device_id & 0xfff) == 0x436) {
printed = snprintf(buf, buf_size, "stm32lx (HD) - Rev: ");
buf += printed;
buf_size -= printed;
switch (device_id >> 16) {
case 0x1000:
snprintf(buf, buf_size, "A");
break;
case 0x1008:
snprintf(buf, buf_size, "Z");
break;
case 0x1018:
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",
.usage = "",
.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
*/
/* check flash is not already unlocked */
retval = target_read_u32(target, FLASH_PECR, &reg32);
if (retval != ERROR_OK)
return retval;
if ((reg32 & FLASH_PECR__PRGLOCK) == 0)
return ERROR_OK;
/* 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, &reg32);
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, &reg32);
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, &reg32);
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, &reg32);
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, &reg32);
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, &reg32);
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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