stm32f1x.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *   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 Andreas Fritiofson                              *
 *   andreas.fritiofson@gmail.com                                          *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include <string.h>
 
#include "imp.h"
#include <helper/binarybuffer.h>
#include <target/algorithm.h>
#include <target/cortex_m.h>
 
/* stm32x register locations */
 
#define FLASH_REG_BASE_B0 0x40022000
#define FLASH_REG_BASE_B1 0x40022040
 
#define STM32_FLASH_ACR     0x00
#define STM32_FLASH_KEYR    0x04
#define STM32_FLASH_OPTKEYR 0x08
#define STM32_FLASH_SR      0x0C
#define STM32_FLASH_CR      0x10
#define STM32_FLASH_AR      0x14
#define STM32_FLASH_OBR     0x1C
#define STM32_FLASH_WRPR    0x20
 
/* TODO: Check if code using these really should be hard coded to bank 0.
 * There are valid cases, on dual flash devices the protection of the
 * second bank is done on the bank0 reg's. */
#define STM32_FLASH_ACR_B0     0x40022000
#define STM32_FLASH_KEYR_B0    0x40022004
#define STM32_FLASH_OPTKEYR_B0 0x40022008
#define STM32_FLASH_SR_B0      0x4002200C
#define STM32_FLASH_CR_B0      0x40022010
#define STM32_FLASH_AR_B0      0x40022014
#define STM32_FLASH_OBR_B0     0x4002201C
#define STM32_FLASH_WRPR_B0    0x40022020
 
/* option byte location */
 
#define STM32_OB_RDP        0x1FFFF800
#define STM32_OB_USER       0x1FFFF802
#define STM32_OB_DATA0      0x1FFFF804
#define STM32_OB_DATA1      0x1FFFF806
#define STM32_OB_WRP0       0x1FFFF808
#define STM32_OB_WRP1       0x1FFFF80A
#define STM32_OB_WRP2       0x1FFFF80C
#define STM32_OB_WRP3       0x1FFFF80E
 
/* FLASH_CR register bits */
 
#define FLASH_PG            (1 << 0)
#define FLASH_PER           (1 << 1)
#define FLASH_MER           (1 << 2)
#define FLASH_OPTPG         (1 << 4)
#define FLASH_OPTER         (1 << 5)
#define FLASH_STRT          (1 << 6)
#define FLASH_LOCK          (1 << 7)
#define FLASH_OPTWRE        (1 << 9)
#define FLASH_OBL_LAUNCH    (1 << 13)   /* except stm32f1x series */
 
/* FLASH_SR register bits */
 
#define FLASH_BSY       (1 << 0)
#define FLASH_PGERR     (1 << 2)
#define FLASH_WRPRTERR  (1 << 4)
#define FLASH_EOP       (1 << 5)
 
/* STM32_FLASH_OBR bit definitions (reading) */
 
#define OPT_ERROR       0
#define OPT_READOUT     1
#define OPT_RDWDGSW     2
#define OPT_RDRSTSTOP   3
#define OPT_RDRSTSTDBY  4
#define OPT_BFB2        5   /* dual flash bank only */
 
/* register unlock keys */
 
#define KEY1            0x45670123
#define KEY2            0xCDEF89AB
 
/* timeout values */
 
#define FLASH_WRITE_TIMEOUT 10
#define FLASH_ERASE_TIMEOUT 100
 
struct stm32x_options {
    uint8_t rdp;
    uint8_t user;
    uint16_t data;
    uint32_t protection;
};
 
struct stm32x_flash_bank {
    struct stm32x_options option_bytes;
    int ppage_size;
    bool probed;
 
    bool has_dual_banks;
    /* used to access dual flash bank stm32xl */
    bool can_load_options;
    uint32_t register_base;
    uint8_t default_rdp;
    int user_data_offset;
    int option_offset;
    uint32_t user_bank_size;
};
 
static int stm32x_mass_erase(struct flash_bank *bank);
static int stm32x_write_block(struct flash_bank *bank, const uint8_t *buffer,
        uint32_t address, uint32_t hwords_count);
 
/* flash bank stm32x <base> <size> 0 0 <target#>
 */
FLASH_BANK_COMMAND_HANDLER(stm32x_flash_bank_command)
{
    struct stm32x_flash_bank *stm32x_info;
 
    if (CMD_ARGC < 6)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    stm32x_info = malloc(sizeof(struct stm32x_flash_bank));
 
    bank->driver_priv = stm32x_info;
    stm32x_info->probed = false;
    stm32x_info->has_dual_banks = false;
    stm32x_info->can_load_options = false;
    stm32x_info->register_base = FLASH_REG_BASE_B0;
    stm32x_info->user_bank_size = bank->size;
 
    /* The flash write must be aligned to a halfword boundary */
    bank->write_start_alignment = bank->write_end_alignment = 2;
 
    return ERROR_OK;
}
 
static inline int stm32x_get_flash_reg(struct flash_bank *bank, uint32_t reg)
{
    struct stm32x_flash_bank *stm32x_info = bank->driver_priv;
    return reg + stm32x_info->register_base;
}
 
static inline int stm32x_get_flash_status(struct flash_bank *bank, uint32_t *status)
{
    struct target *target = bank->target;
    return target_read_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_SR), status);
}
 
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 */
    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_FLASH_BUSY;
        }
        alive_sleep(1);
    }
 
    if (status & FLASH_WRPRTERR) {
        LOG_ERROR("stm32x device protected");
        retval = ERROR_FLASH_PROTECTED;
    }
 
    if (status & FLASH_PGERR) {
        LOG_ERROR("stm32x device programming failed / flash not erased");
        retval = ERROR_FLASH_OPERATION_FAILED;
    }
 
    /* 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, stm32x_get_flash_reg(bank, STM32_FLASH_SR),
                FLASH_WRPRTERR | FLASH_PGERR);
    }
    return retval;
}
 
static int stm32x_check_operation_supported(struct flash_bank *bank)
{
    struct stm32x_flash_bank *stm32x_info = bank->driver_priv;
 
    /* if we have a dual flash bank device then
     * we need to perform option byte stuff on bank0 only */
    if (stm32x_info->register_base != FLASH_REG_BASE_B0) {
        LOG_ERROR("Option byte operations must use bank 0");
        return ERROR_FLASH_OPERATION_FAILED;
    }
 
    return ERROR_OK;
}
 
static int stm32x_read_options(struct flash_bank *bank)
{
    struct stm32x_flash_bank *stm32x_info = bank->driver_priv;
    struct target *target = bank->target;
    uint32_t option_bytes;
    int retval;
 
    /* read user and read protection option bytes, user data option bytes */
    retval = target_read_u32(target, STM32_FLASH_OBR_B0, &option_bytes);
    if (retval != ERROR_OK)
        return retval;
 
    stm32x_info->option_bytes.rdp = (option_bytes & (1 << OPT_READOUT)) ? 0 : stm32x_info->default_rdp;
    stm32x_info->option_bytes.user = (option_bytes >> stm32x_info->option_offset >> 2) & 0xff;
    stm32x_info->option_bytes.data = (option_bytes >> stm32x_info->user_data_offset) & 0xffff;
 
    /* read write protection option bytes */
    retval = target_read_u32(target, STM32_FLASH_WRPR_B0, &stm32x_info->option_bytes.protection);
    if (retval != ERROR_OK)
        return retval;
 
    return ERROR_OK;
}
 
static int stm32x_erase_options(struct flash_bank *bank)
{
    struct stm32x_flash_bank *stm32x_info = bank->driver_priv;
    struct target *target = bank->target;
 
    /* read current options */
    stm32x_read_options(bank);
 
    /* unlock flash registers */
    int retval = target_write_u32(target, STM32_FLASH_KEYR_B0, KEY1);
    if (retval != ERROR_OK)
        return retval;
    retval = target_write_u32(target, STM32_FLASH_KEYR_B0, KEY2);
    if (retval != ERROR_OK)
        goto flash_lock;
 
    /* unlock option flash registers */
    retval = target_write_u32(target, STM32_FLASH_OPTKEYR_B0, KEY1);
    if (retval != ERROR_OK)
        goto flash_lock;
    retval = target_write_u32(target, STM32_FLASH_OPTKEYR_B0, KEY2);
    if (retval != ERROR_OK)
        goto flash_lock;
 
    /* erase option bytes */
    retval = target_write_u32(target, STM32_FLASH_CR_B0, FLASH_OPTER | FLASH_OPTWRE);
    if (retval != ERROR_OK)
        goto flash_lock;
    retval = target_write_u32(target, STM32_FLASH_CR_B0, FLASH_OPTER | FLASH_STRT | FLASH_OPTWRE);
    if (retval != ERROR_OK)
        goto flash_lock;
 
    retval = stm32x_wait_status_busy(bank, FLASH_ERASE_TIMEOUT);
    if (retval != ERROR_OK)
        goto flash_lock;
 
    /* clear read protection option byte
     * this will also force a device unlock if set */
    stm32x_info->option_bytes.rdp = stm32x_info->default_rdp;
 
    return ERROR_OK;
 
flash_lock:
    target_write_u32(target, STM32_FLASH_CR_B0, FLASH_LOCK);
    return retval;
}
 
static int stm32x_write_options(struct flash_bank *bank)
{
    struct stm32x_flash_bank *stm32x_info = NULL;
    struct target *target = bank->target;
 
    stm32x_info = bank->driver_priv;
 
    /* unlock flash registers */
    int retval = target_write_u32(target, STM32_FLASH_KEYR_B0, KEY1);
    if (retval != ERROR_OK)
        return retval;
    retval = target_write_u32(target, STM32_FLASH_KEYR_B0, KEY2);
    if (retval != ERROR_OK)
        goto flash_lock;
 
    /* unlock option flash registers */
    retval = target_write_u32(target, STM32_FLASH_OPTKEYR_B0, KEY1);
    if (retval != ERROR_OK)
        goto flash_lock;
    retval = target_write_u32(target, STM32_FLASH_OPTKEYR_B0, KEY2);
    if (retval != ERROR_OK)
        goto flash_lock;
 
    /* program option bytes */
    retval = target_write_u32(target, STM32_FLASH_CR_B0, FLASH_OPTPG | FLASH_OPTWRE);
    if (retval != ERROR_OK)
        goto flash_lock;
 
    uint8_t opt_bytes[16];
 
    target_buffer_set_u16(target, opt_bytes, stm32x_info->option_bytes.rdp);
    target_buffer_set_u16(target, opt_bytes + 2, stm32x_info->option_bytes.user);
    target_buffer_set_u16(target, opt_bytes + 4, stm32x_info->option_bytes.data & 0xff);
    target_buffer_set_u16(target, opt_bytes + 6, (stm32x_info->option_bytes.data >> 8) & 0xff);
    target_buffer_set_u16(target, opt_bytes + 8, stm32x_info->option_bytes.protection & 0xff);
    target_buffer_set_u16(target, opt_bytes + 10, (stm32x_info->option_bytes.protection >> 8) & 0xff);
    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);
 
flash_lock:
    {
        int retval2 = target_write_u32(target, STM32_FLASH_CR_B0, FLASH_LOCK);
        if (retval == ERROR_OK)
            retval = retval2;
    }
    return retval;
}
 
static int stm32x_protect_check(struct flash_bank *bank)
{
    struct target *target = bank->target;
    uint32_t protection;
 
    int retval = stm32x_check_operation_supported(bank);
    if (retval != ERROR_OK)
        return retval;
 
    /* medium density - each bit refers to a 4 sector protection block
     * high density - each bit refers to a 2 sector protection block
     * bit 31 refers to all remaining sectors in a bank */
    retval = target_read_u32(target, STM32_FLASH_WRPR_B0, &protection);
    if (retval != ERROR_OK)
        return retval;
 
    for (unsigned int i = 0; i < bank->num_prot_blocks; i++)
        bank->prot_blocks[i].is_protected = (protection & (1 << i)) ? 0 : 1;
 
    return ERROR_OK;
}
 
static int stm32x_erase(struct flash_bank *bank, unsigned int first,
        unsigned int last)
{
    struct target *target = bank->target;
 
    if (bank->target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    if ((first == 0) && (last == (bank->num_sectors - 1)))
        return stm32x_mass_erase(bank);
 
    /* unlock flash registers */
    int retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_KEYR), KEY1);
    if (retval != ERROR_OK)
        return retval;
    retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_KEYR), KEY2);
    if (retval != ERROR_OK)
        goto flash_lock;
 
    for (unsigned int i = first; i <= last; i++) {
        retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_CR), FLASH_PER);
        if (retval != ERROR_OK)
            goto flash_lock;
        retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_AR),
                bank->base + bank->sectors[i].offset);
        if (retval != ERROR_OK)
            goto flash_lock;
        retval = target_write_u32(target,
                stm32x_get_flash_reg(bank, STM32_FLASH_CR), FLASH_PER | FLASH_STRT);
        if (retval != ERROR_OK)
            goto flash_lock;
 
        retval = stm32x_wait_status_busy(bank, FLASH_ERASE_TIMEOUT);
        if (retval != ERROR_OK)
            goto flash_lock;
    }
 
flash_lock:
    {
        int retval2 = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_CR), FLASH_LOCK);
        if (retval == ERROR_OK)
            retval = retval2;
    }
    return retval;
}
 
static int stm32x_protect(struct flash_bank *bank, int set, unsigned int first,
        unsigned int last)
{
    struct target *target = bank->target;
    struct stm32x_flash_bank *stm32x_info = bank->driver_priv;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    int retval = stm32x_check_operation_supported(bank);
    if (retval != ERROR_OK)
        return retval;
 
    retval = stm32x_erase_options(bank);
    if (retval != ERROR_OK) {
        LOG_ERROR("stm32x failed to erase options");
        return retval;
    }
 
    for (unsigned int i = first; i <= last; i++) {
        if (set)
            stm32x_info->option_bytes.protection &= ~(1 << i);
        else
            stm32x_info->option_bytes.protection |= (1 << i);
    }
 
    return stm32x_write_options(bank);
}
 
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;
    uint32_t buffer_size;
    struct working_area *write_algorithm;
    struct working_area *source;
    struct armv7m_algorithm armv7m_info;
    int retval;
 
    static const uint8_t stm32x_flash_write_code[] = {
#include "../../../contrib/loaders/flash/stm32/stm32f1x.inc"
    };
 
    /* flash write code */
    if (target_alloc_working_area(target, sizeof(stm32x_flash_write_code),
            &write_algorithm) != ERROR_OK) {
        LOG_WARNING("no working area available, can't do block memory writes");
        return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
    }
 
    retval = target_write_buffer(target, write_algorithm->address,
            sizeof(stm32x_flash_write_code), stm32x_flash_write_code);
    if (retval != ERROR_OK) {
        target_free_working_area(target, write_algorithm);
        return retval;
    }
 
    /* memory buffer */
    buffer_size = target_get_working_area_avail(target);
    buffer_size = MIN(hwords_count * 2 + 8, MAX(buffer_size, 256));
    /* Normally we allocate all available working area.
     * MIN shrinks buffer_size if the size of the written block is smaller.
     * MAX prevents using async algo if the available working area is smaller
     * than 256, the following allocation fails with
     * ERROR_TARGET_RESOURCE_NOT_AVAILABLE and slow flashing takes place.
     */
 
    retval = target_alloc_working_area(target, buffer_size, &source);
    /* Allocated size is always 32-bit word aligned */
    if (retval != ERROR_OK) {
        target_free_working_area(target, write_algorithm);
        LOG_WARNING("no large enough working area available, can't do block memory writes");
        /* target_alloc_working_area() may return ERROR_FAIL if area backup fails:
         * convert any error to ERROR_TARGET_RESOURCE_NOT_AVAILABLE
         */
        return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
    }
 
    struct reg_param reg_params[5];
 
    init_reg_param(&reg_params[0], "r0", 32, PARAM_IN_OUT); /* flash base (in), status (out) */
    init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);    /* count (halfword-16bit) */
    init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT);    /* buffer start */
    init_reg_param(&reg_params[3], "r3", 32, PARAM_OUT);    /* buffer end */
    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, 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);
 
    armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
    armv7m_info.core_mode = ARM_MODE_THREAD;
 
    retval = target_run_flash_async_algorithm(target, buffer, hwords_count, 2,
            0, NULL,
            ARRAY_SIZE(reg_params), reg_params,
            source->address, source->size,
            write_algorithm->address, 0,
            &armv7m_info);
 
    if (retval == ERROR_FLASH_OPERATION_FAILED) {
        /* Actually we just need to check for programming errors
         * stm32x_wait_status_busy also reports error and clears status bits.
         *
         * Target algo returns flash status in r0 only if properly finished.
         * It is safer to re-read status register.
         */
        int retval2 = stm32x_wait_status_busy(bank, 5);
        if (retval2 != ERROR_OK)
            retval = retval2;
 
        LOG_ERROR("flash write failed just before address 0x%"PRIx32,
                buf_get_u32(reg_params[4].value, 0, 32));
    }
 
    for (unsigned int i = 0; i < ARRAY_SIZE(reg_params); i++)
        destroy_reg_param(&reg_params[i]);
 
    target_free_working_area(target, source);
    target_free_working_area(target, write_algorithm);
 
    return retval;
}
 
static int stm32x_write_block_riscv(struct flash_bank *bank, const uint8_t *buffer,
        uint32_t address, uint32_t hwords_count)
{
    struct target *target = bank->target;
    uint32_t buffer_size;
    struct working_area *write_algorithm;
    struct working_area *source;
    static const uint8_t gd32vf103_flash_write_code[] = {
#include "../../../contrib/loaders/flash/gd32vf103/gd32vf103.inc"
    };
 
    /* flash write code */
    if (target_alloc_working_area(target, sizeof(gd32vf103_flash_write_code),
            &write_algorithm) != ERROR_OK) {
        LOG_WARNING("no working area available, can't do block memory writes");
        return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
    }
 
    int retval = target_write_buffer(target, write_algorithm->address,
            sizeof(gd32vf103_flash_write_code), gd32vf103_flash_write_code);
    if (retval != ERROR_OK) {
        target_free_working_area(target, write_algorithm);
        return retval;
    }
 
    /* memory buffer */
    buffer_size = target_get_working_area_avail(target);
    buffer_size = MIN(hwords_count * 2, MAX(buffer_size, 256));
 
    retval = target_alloc_working_area(target, buffer_size, &source);
    /* Allocated size is always word aligned */
    if (retval != ERROR_OK) {
        target_free_working_area(target, write_algorithm);
        LOG_WARNING("no large enough working area available, can't do block memory writes");
        /* target_alloc_working_area() may return ERROR_FAIL if area backup fails:
         * convert any error to ERROR_TARGET_RESOURCE_NOT_AVAILABLE
         */
        return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
    }
 
    struct reg_param reg_params[4];
 
    init_reg_param(&reg_params[0], "a0", 32, PARAM_OUT);    /* poiner to FLASH_SR */
    init_reg_param(&reg_params[1], "a1", 32, PARAM_OUT);    /* count (halfword-16bit) */
    init_reg_param(&reg_params[2], "a2", 32, PARAM_OUT);    /* buffer start */
    init_reg_param(&reg_params[3], "a3", 32, PARAM_IN_OUT); /* target address */
 
    while (hwords_count > 0) {
        uint32_t thisrun_hwords = source->size / 2;
 
        /* Limit to the amount of data we actually want to write */
        if (thisrun_hwords > hwords_count)
            thisrun_hwords = hwords_count;
 
        /* Write data to buffer */
        retval = target_write_buffer(target, source->address,
                    thisrun_hwords * 2, buffer);
        if (retval != ERROR_OK)
            break;
 
        buf_set_u32(reg_params[0].value, 0, 32, stm32x_get_flash_reg(bank, STM32_FLASH_SR));
        buf_set_u32(reg_params[1].value, 0, 32, thisrun_hwords);
        buf_set_u32(reg_params[2].value, 0, 32, source->address);
        buf_set_u32(reg_params[3].value, 0, 32, address);
 
        retval = target_run_algorithm(target,
                0, NULL,
                ARRAY_SIZE(reg_params), reg_params,
                write_algorithm->address,
                write_algorithm->address + sizeof(gd32vf103_flash_write_code) - 4,
                10000, NULL);
 
        if (retval != ERROR_OK) {
            LOG_ERROR("Failed to execute algorithm at 0x%" TARGET_PRIxADDR ": %d",
                    write_algorithm->address, retval);
            break;
        }
 
        /* Actually we just need to check for programming errors
         * stm32x_wait_status_busy also reports error and clears status bits
         */
        retval = stm32x_wait_status_busy(bank, 5);
        if (retval != ERROR_OK) {
            LOG_ERROR("flash write failed at address 0x%"PRIx32,
                    buf_get_u32(reg_params[3].value, 0, 32));
            break;
        }
 
        /* Update counters */
        buffer += thisrun_hwords * 2;
        address += thisrun_hwords * 2;
        hwords_count -= thisrun_hwords;
    }
 
    for (unsigned int i = 0; i < ARRAY_SIZE(reg_params); i++)
        destroy_reg_param(&reg_params[i]);
 
    target_free_working_area(target, source);
    target_free_working_area(target, write_algorithm);
 
    return retval;
}
 
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;
 
    /* The flash write must be aligned to a halfword boundary.
     * The flash infrastructure ensures it, do just a security check
     */
    assert(address % 2 == 0);
 
    int retval;
    struct arm *arm = target_to_arm(target);
    if (is_arm(arm)) {
        /* try using a block write - on ARM architecture or... */
        retval = stm32x_write_block_async(bank, buffer, address, hwords_count);
    } else {
        /* ... RISC-V architecture */
        retval = stm32x_write_block_riscv(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)
{
    struct target *target = bank->target;
 
    if (bank->target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    /* The flash write must be aligned to a halfword boundary.
     * The flash infrastructure ensures it, do just a security check
     */
    assert(offset % 2 == 0);
    assert(count % 2 == 0);
 
    int retval, retval2;
 
    /* unlock flash registers */
    retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_KEYR), KEY1);
    if (retval != ERROR_OK)
        return retval;
    retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_KEYR), KEY2);
    if (retval != ERROR_OK)
        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 reset_pg_and_lock;
 
    /* 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);
    if (retval == ERROR_OK)
        retval = retval2;
 
    return retval;
}
 
struct stm32x_property_addr {
    uint32_t device_id;
    uint32_t flash_size;
};
 
static int stm32x_get_property_addr(struct target *target, struct stm32x_property_addr *addr)
{
    if (!target_was_examined(target)) {
        LOG_ERROR("Target not examined yet");
        return ERROR_TARGET_NOT_EXAMINED;
    }
 
    switch (cortex_m_get_partno_safe(target)) {
    case CORTEX_M0_PARTNO: /* STM32F0x devices */
        addr->device_id = 0x40015800;
        addr->flash_size = 0x1FFFF7CC;
        return ERROR_OK;
    case CORTEX_M3_PARTNO: /* STM32F1x devices */
        addr->device_id = 0xE0042000;
        addr->flash_size = 0x1FFFF7E0;
        return ERROR_OK;
    case CORTEX_M4_PARTNO: /* STM32F3x devices */
        addr->device_id = 0xE0042000;
        addr->flash_size = 0x1FFFF7CC;
        return ERROR_OK;
    case CORTEX_M23_PARTNO: /* GD32E23x devices */
        addr->device_id = 0x40015800;
        addr->flash_size = 0x1FFFF7E0;
        return ERROR_OK;
    case CORTEX_M_PARTNO_INVALID:
        /* Check for GD32VF103 with RISC-V CPU */
        if (strcmp(target_type_name(target), "riscv") == 0
                && target_address_bits(target) == 32) {
            /* There is nothing like arm common_magic in riscv_info_t
             * check text name of target and if target is 32-bit
             */
            addr->device_id = 0xE0042000;
            addr->flash_size = 0x1FFFF7E0;
            return ERROR_OK;
        }
        /* fallthrough */
    default:
        LOG_ERROR("Cannot identify target as a stm32x");
        return ERROR_FAIL;
    }
}
 
static int stm32x_get_device_id(struct flash_bank *bank, uint32_t *device_id)
{
    struct target *target = bank->target;
    struct stm32x_property_addr addr;
 
    int retval = stm32x_get_property_addr(target, &addr);
    if (retval != ERROR_OK)
        return retval;
 
    return target_read_u32(target, addr.device_id, device_id);
}
 
static int stm32x_get_flash_size(struct flash_bank *bank, uint16_t *flash_size_in_kb)
{
    struct target *target = bank->target;
    struct stm32x_property_addr addr;
 
    int retval = stm32x_get_property_addr(target, &addr);
    if (retval != ERROR_OK)
        return retval;
 
    return target_read_u16(target, addr.flash_size, flash_size_in_kb);
}
 
static int stm32x_probe(struct flash_bank *bank)
{
    struct stm32x_flash_bank *stm32x_info = bank->driver_priv;
    uint16_t flash_size_in_kb;
    uint16_t max_flash_size_in_kb;
    uint32_t dbgmcu_idcode;
    int page_size;
    uint32_t base_address = 0x08000000;
 
    stm32x_info->probed = false;
    stm32x_info->register_base = FLASH_REG_BASE_B0;
    stm32x_info->user_data_offset = 10;
    stm32x_info->option_offset = 0;
 
    /* default factory read protection level 0 */
    stm32x_info->default_rdp = 0xA5;
 
    /* read stm32 device id register */
    int retval = stm32x_get_device_id(bank, &dbgmcu_idcode);
    if (retval != ERROR_OK)
        return retval;
 
    LOG_INFO("device id = 0x%08" PRIx32 "", dbgmcu_idcode);
 
    uint16_t device_id = dbgmcu_idcode & 0xfff;
    uint16_t rev_id = dbgmcu_idcode >> 16;
 
    /* set page size, protection granularity and max flash size depending on family */
    switch (device_id) {
    case 0x440: /* stm32f05x */
        page_size = 1024;
        stm32x_info->ppage_size = 4;
        max_flash_size_in_kb = 64;
        stm32x_info->user_data_offset = 16;
        stm32x_info->option_offset = 6;
        stm32x_info->default_rdp = 0xAA;
        stm32x_info->can_load_options = true;
        break;
    case 0x444: /* stm32f03x */
    case 0x445: /* stm32f04x */
        page_size = 1024;
        stm32x_info->ppage_size = 4;
        max_flash_size_in_kb = 32;
        stm32x_info->user_data_offset = 16;
        stm32x_info->option_offset = 6;
        stm32x_info->default_rdp = 0xAA;
        stm32x_info->can_load_options = true;
        break;
    case 0x448: /* stm32f07x */
        page_size = 2048;
        stm32x_info->ppage_size = 4;
        max_flash_size_in_kb = 128;
        stm32x_info->user_data_offset = 16;
        stm32x_info->option_offset = 6;
        stm32x_info->default_rdp = 0xAA;
        stm32x_info->can_load_options = true;
        break;
    case 0x442: /* stm32f09x */
        page_size = 2048;
        stm32x_info->ppage_size = 4;
        max_flash_size_in_kb = 256;
        stm32x_info->user_data_offset = 16;
        stm32x_info->option_offset = 6;
        stm32x_info->default_rdp = 0xAA;
        stm32x_info->can_load_options = true;
        break;
    case 0x410: /* stm32f1x medium-density */
        page_size = 1024;
        stm32x_info->ppage_size = 4;
        max_flash_size_in_kb = 128;
        /* GigaDevice GD32F1x0 & GD32F3x0 & GD32E23x series devices
           share DEV_ID with STM32F101/2/3 medium-density line,
           however they use a REV_ID different from any STM32 device.
           The main difference is another offset of user option bits
           (like WDG_SW, nRST_STOP, nRST_STDBY) in option byte register
           (FLASH_OBR/FMC_OBSTAT 0x4002201C).
           This caused problems e.g. during flash block programming
           because of unexpected active hardware watchog. */
        switch (rev_id) {
        case 0x1303: /* gd32f1x0 */
            stm32x_info->user_data_offset = 16;
            stm32x_info->option_offset = 6;
            max_flash_size_in_kb = 64;
            stm32x_info->can_load_options = true;
            break;
        case 0x1704: /* gd32f3x0 */
            stm32x_info->user_data_offset = 16;
            stm32x_info->option_offset = 6;
            stm32x_info->can_load_options = true;
            break;
        case 0x1906: /* gd32vf103 */
            break;
        case 0x1909: /* gd32e23x */
            stm32x_info->user_data_offset = 16;
            stm32x_info->option_offset = 6;
            max_flash_size_in_kb = 64;
            stm32x_info->can_load_options = true;
            break;
        }
        break;
    case 0x412: /* stm32f1x low-density */
        page_size = 1024;
        stm32x_info->ppage_size = 4;
        max_flash_size_in_kb = 32;
        break;
    case 0x414: /* stm32f1x high-density */
        page_size = 2048;
        stm32x_info->ppage_size = 2;
        max_flash_size_in_kb = 512;
        break;
    case 0x418: /* stm32f1x connectivity */
        page_size = 2048;
        stm32x_info->ppage_size = 2;
        max_flash_size_in_kb = 256;
        break;
    case 0x430: /* stm32f1 XL-density (dual flash banks) */
        page_size = 2048;
        stm32x_info->ppage_size = 2;
        max_flash_size_in_kb = 1024;
        stm32x_info->has_dual_banks = true;
        break;
    case 0x420: /* stm32f100xx low- and medium-density value line */
        page_size = 1024;
        stm32x_info->ppage_size = 4;
        max_flash_size_in_kb = 128;
        break;
    case 0x428: /* stm32f100xx high-density value line */
        page_size = 2048;
        stm32x_info->ppage_size = 4;
        max_flash_size_in_kb = 512;
        break;
    case 0x422: /* stm32f302/3xb/c */
        page_size = 2048;
        stm32x_info->ppage_size = 2;
        max_flash_size_in_kb = 256;
        stm32x_info->user_data_offset = 16;
        stm32x_info->option_offset = 6;
        stm32x_info->default_rdp = 0xAA;
        stm32x_info->can_load_options = true;
        break;
    case 0x446: /* stm32f303xD/E */
        page_size = 2048;
        stm32x_info->ppage_size = 2;
        max_flash_size_in_kb = 512;
        stm32x_info->user_data_offset = 16;
        stm32x_info->option_offset = 6;
        stm32x_info->default_rdp = 0xAA;
        stm32x_info->can_load_options = true;
        break;
    case 0x432: /* stm32f37x */
        page_size = 2048;
        stm32x_info->ppage_size = 2;
        max_flash_size_in_kb = 256;
        stm32x_info->user_data_offset = 16;
        stm32x_info->option_offset = 6;
        stm32x_info->default_rdp = 0xAA;
        stm32x_info->can_load_options = true;
        break;
    case 0x438: /* stm32f33x */
    case 0x439: /* stm32f302x6/8 */
        page_size = 2048;
        stm32x_info->ppage_size = 2;
        max_flash_size_in_kb = 64;
        stm32x_info->user_data_offset = 16;
        stm32x_info->option_offset = 6;
        stm32x_info->default_rdp = 0xAA;
        stm32x_info->can_load_options = true;
        break;
    default:
        LOG_WARNING("Cannot identify target as a STM32 family.");
        return ERROR_FAIL;
    }
 
    /* get flash size from target. */
    retval = stm32x_get_flash_size(bank, &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("STM32 flash size failed, probe inaccurate - assuming %dk flash",
            max_flash_size_in_kb);
        flash_size_in_kb = max_flash_size_in_kb;
    }
 
    if (stm32x_info->has_dual_banks) {
        /* split reported size into matching bank */
        if (bank->base != 0x08080000) {
            /* bank 0 will be fixed 512k */
            flash_size_in_kb = 512;
        } else {
            flash_size_in_kb -= 512;
            /* bank1 also uses a register offset */
            stm32x_info->register_base = FLASH_REG_BASE_B1;
            base_address = 0x08080000;
        }
    }
 
    /* 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 (stm32x_info->user_bank_size) {
        LOG_INFO("ignoring flash probed value, using configured bank size");
        flash_size_in_kb = stm32x_info->user_bank_size / 1024;
    }
 
    LOG_INFO("flash size = %d KiB", flash_size_in_kb);
 
    /* did we assign flash size? */
    assert(flash_size_in_kb != 0xffff);
 
    /* calculate numbers of pages */
    int num_pages = flash_size_in_kb * 1024 / page_size;
 
    /* check that calculation result makes sense */
    assert(num_pages > 0);
 
    free(bank->sectors);
    bank->sectors = NULL;
 
    free(bank->prot_blocks);
    bank->prot_blocks = NULL;
 
    bank->base = base_address;
    bank->size = (num_pages * page_size);
 
    bank->num_sectors = num_pages;
    bank->sectors = alloc_block_array(0, page_size, num_pages);
    if (!bank->sectors)
        return ERROR_FAIL;
 
    /* calculate number of write protection blocks */
    int num_prot_blocks = num_pages / stm32x_info->ppage_size;
    if (num_prot_blocks > 32)
        num_prot_blocks = 32;
 
    bank->num_prot_blocks = num_prot_blocks;
    bank->prot_blocks = alloc_block_array(0, stm32x_info->ppage_size * page_size, num_prot_blocks);
    if (!bank->prot_blocks)
        return ERROR_FAIL;
 
    if (num_prot_blocks == 32)
        bank->prot_blocks[31].size = (num_pages - (31 * stm32x_info->ppage_size)) * page_size;
 
    stm32x_info->probed = true;
 
    return ERROR_OK;
}
 
static int stm32x_auto_probe(struct flash_bank *bank)
{
    struct stm32x_flash_bank *stm32x_info = bank->driver_priv;
    if (stm32x_info->probed)
        return ERROR_OK;
    return stm32x_probe(bank);
}
 
#if 0
COMMAND_HANDLER(stm32x_handle_part_id_command)
{
    return ERROR_OK;
}
#endif
 
static const char *get_stm32f0_revision(uint16_t rev_id)
{
    const char *rev_str = NULL;
 
    switch (rev_id) {
    case 0x1000:
        rev_str = "1.0";
        break;
    case 0x2000:
        rev_str = "2.0";
        break;
    }
    return rev_str;
}
 
static int get_stm32x_info(struct flash_bank *bank, struct command_invocation *cmd)
{
    uint32_t dbgmcu_idcode;
 
    /* read stm32 device id register */
    int retval = stm32x_get_device_id(bank, &dbgmcu_idcode);
    if (retval != ERROR_OK)
        return retval;
 
    uint16_t device_id = dbgmcu_idcode & 0xfff;
    uint16_t rev_id = dbgmcu_idcode >> 16;
    const char *device_str;
    const char *rev_str = NULL;
 
    switch (device_id) {
    case 0x410:
        device_str = "STM32F10x (Medium Density)";
 
        switch (rev_id) {
        case 0x0000:
            rev_str = "A";
            break;
 
        case 0x1303: /* gd32f1x0 */
            device_str = "GD32F1x0";
            break;
 
        case 0x1704: /* gd32f3x0 */
            device_str = "GD32F3x0";
            break;
 
        case 0x1906:
            device_str = "GD32VF103";
            break;
 
        case 0x1909: /* gd32e23x */
            device_str = "GD32E23x";
            break;
 
        case 0x2000:
            rev_str = "B";
            break;
 
        case 0x2001:
            rev_str = "Z";
            break;
 
        case 0x2003:
            rev_str = "Y";
            break;
        }
        break;
 
    case 0x412:
        device_str = "STM32F10x (Low Density)";
 
        switch (rev_id) {
        case 0x1000:
            rev_str = "A";
            break;
        }
        break;
 
    case 0x414:
        device_str = "STM32F10x (High Density)";
 
        switch (rev_id) {
        case 0x1000:
            rev_str = "A";
            break;
 
        case 0x1001:
            rev_str = "Z";
            break;
 
        case 0x1003:
            rev_str = "Y";
            break;
        }
        break;
 
    case 0x418:
        device_str = "STM32F10x (Connectivity)";
 
        switch (rev_id) {
        case 0x1000:
            rev_str = "A";
            break;
 
        case 0x1001:
            rev_str = "Z";
            break;
        }
        break;
 
    case 0x420:
        device_str = "STM32F100 (Low/Medium Density)";
 
        switch (rev_id) {
        case 0x1000:
            rev_str = "A";
            break;
 
        case 0x1001:
            rev_str = "Z";
            break;
        }
        break;
 
    case 0x422:
        device_str = "STM32F302xB/C";
 
        switch (rev_id) {
        case 0x1000:
            rev_str = "A";
            break;
 
        case 0x1001:
            rev_str = "Z";
            break;
 
        case 0x1003:
            rev_str = "Y";
            break;
 
        case 0x2000:
            rev_str = "B";
            break;
        }
        break;
 
    case 0x428:
        device_str = "STM32F100 (High Density)";
 
        switch (rev_id) {
        case 0x1000:
            rev_str = "A";
            break;
 
        case 0x1001:
            rev_str = "Z";
            break;
        }
        break;
 
    case 0x430:
        device_str = "STM32F10x (XL Density)";
 
        switch (rev_id) {
        case 0x1000:
            rev_str = "A";
            break;
        }
        break;
 
    case 0x432:
        device_str = "STM32F37x";
 
        switch (rev_id) {
        case 0x1000:
            rev_str = "A";
            break;
 
        case 0x2000:
            rev_str = "B";
            break;
        }
        break;
 
    case 0x438:
        device_str = "STM32F33x";
 
        switch (rev_id) {
        case 0x1000:
            rev_str = "A";
            break;
        }
        break;
 
    case 0x439:
        device_str = "STM32F302x6/8";
 
        switch (rev_id) {
        case 0x1000:
            rev_str = "A";
            break;
 
        case 0x1001:
            rev_str = "Z";
            break;
        }
        break;
 
    case 0x444:
        device_str = "STM32F03x";
        rev_str = get_stm32f0_revision(rev_id);
        break;
 
    case 0x440:
        device_str = "STM32F05x";
        rev_str = get_stm32f0_revision(rev_id);
        break;
 
    case 0x445:
        device_str = "STM32F04x";
        rev_str = get_stm32f0_revision(rev_id);
        break;
 
    case 0x446:
        device_str = "STM32F303xD/E";
        switch (rev_id) {
        case 0x1000:
            rev_str = "A";
            break;
        }
        break;
 
    case 0x448:
        device_str = "STM32F07x";
        rev_str = get_stm32f0_revision(rev_id);
        break;
 
    case 0x442:
        device_str = "STM32F09x";
        rev_str = get_stm32f0_revision(rev_id);
        break;
 
    default:
        command_print_sameline(cmd, "Cannot identify target as a STM32F0/1/3\n");
        return ERROR_FAIL;
    }
 
    if (rev_str)
        command_print_sameline(cmd, "%s - Rev: %s", device_str, rev_str);
    else
        command_print_sameline(cmd, "%s - Rev: unknown (0x%04x)", device_str, rev_id);
 
    return ERROR_OK;
}
 
COMMAND_HANDLER(stm32x_handle_lock_command)
{
    struct target *target = NULL;
    struct stm32x_flash_bank *stm32x_info = NULL;
 
    if (CMD_ARGC < 1)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    struct flash_bank *bank;
    int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
    if (retval != ERROR_OK)
        return retval;
 
    stm32x_info = bank->driver_priv;
 
    target = bank->target;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    retval = stm32x_check_operation_supported(bank);
    if (retval != ERROR_OK)
        return retval;
 
    if (stm32x_erase_options(bank) != ERROR_OK) {
        command_print(CMD, "stm32x failed to erase options");
        return ERROR_OK;
    }
 
    /* set readout protection */
    stm32x_info->option_bytes.rdp = 0;
 
    if (stm32x_write_options(bank) != ERROR_OK) {
        command_print(CMD, "stm32x failed to lock device");
        return ERROR_OK;
    }
 
    command_print(CMD, "stm32x locked");
 
    return ERROR_OK;
}
 
COMMAND_HANDLER(stm32x_handle_unlock_command)
{
    struct target *target = NULL;
 
    if (CMD_ARGC < 1)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    struct flash_bank *bank;
    int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
    if (retval != ERROR_OK)
        return retval;
 
    target = bank->target;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    retval = stm32x_check_operation_supported(bank);
    if (retval != ERROR_OK)
        return retval;
 
    if (stm32x_erase_options(bank) != ERROR_OK) {
        command_print(CMD, "stm32x failed to erase options");
        return ERROR_OK;
    }
 
    if (stm32x_write_options(bank) != ERROR_OK) {
        command_print(CMD, "stm32x failed to unlock device");
        return ERROR_OK;
    }
 
    command_print(CMD, "stm32x unlocked.\n"
            "INFO: a reset or power cycle is required "
            "for the new settings to take effect.");
 
    return ERROR_OK;
}
 
COMMAND_HANDLER(stm32x_handle_options_read_command)
{
    uint32_t optionbyte, protection;
    struct target *target = NULL;
    struct stm32x_flash_bank *stm32x_info = NULL;
 
    if (CMD_ARGC < 1)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    struct flash_bank *bank;
    int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
    if (retval != ERROR_OK)
        return retval;
 
    stm32x_info = bank->driver_priv;
 
    target = bank->target;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    retval = stm32x_check_operation_supported(bank);
    if (retval != ERROR_OK)
        return retval;
 
    retval = target_read_u32(target, STM32_FLASH_OBR_B0, &optionbyte);
    if (retval != ERROR_OK)
        return retval;
 
    uint16_t user_data = optionbyte >> stm32x_info->user_data_offset;
 
    retval = target_read_u32(target, STM32_FLASH_WRPR_B0, &protection);
    if (retval != ERROR_OK)
        return retval;
 
    if (optionbyte & (1 << OPT_ERROR))
        command_print(CMD, "option byte complement error");
 
    command_print(CMD, "option byte register = 0x%" PRIx32 "", optionbyte);
    command_print(CMD, "write protection register = 0x%" PRIx32 "", protection);
 
    command_print(CMD, "read protection: %s",
                (optionbyte & (1 << OPT_READOUT)) ? "on" : "off");
 
    /* user option bytes are offset depending on variant */
    optionbyte >>= stm32x_info->option_offset;
 
    command_print(CMD, "watchdog: %sware",
                (optionbyte & (1 << OPT_RDWDGSW)) ? "soft" : "hard");
 
    command_print(CMD, "stop mode: %sreset generated upon entry",
                (optionbyte & (1 << OPT_RDRSTSTOP)) ? "no " : "");
 
    command_print(CMD, "standby mode: %sreset generated upon entry",
                (optionbyte & (1 << OPT_RDRSTSTDBY)) ? "no " : "");
 
    if (stm32x_info->has_dual_banks)
        command_print(CMD, "boot: bank %d", (optionbyte & (1 << OPT_BFB2)) ? 0 : 1);
 
    command_print(CMD, "user data = 0x%02" PRIx16 "", user_data);
 
    return ERROR_OK;
}
 
COMMAND_HANDLER(stm32x_handle_options_write_command)
{
    struct target *target = NULL;
    struct stm32x_flash_bank *stm32x_info = NULL;
    uint8_t optionbyte;
    uint16_t useropt;
 
    if (CMD_ARGC < 2)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    struct flash_bank *bank;
    int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
    if (retval != ERROR_OK)
        return retval;
 
    stm32x_info = bank->driver_priv;
 
    target = bank->target;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    retval = stm32x_check_operation_supported(bank);
    if (retval != ERROR_OK)
        return retval;
 
    retval = stm32x_read_options(bank);
    if (retval != ERROR_OK)
        return retval;
 
    /* start with current options */
    optionbyte = stm32x_info->option_bytes.user;
    useropt = stm32x_info->option_bytes.data;
 
    /* skip over flash bank */
    CMD_ARGC--;
    CMD_ARGV++;
 
    while (CMD_ARGC) {
        if (strcmp("SWWDG", CMD_ARGV[0]) == 0)
            optionbyte |= (1 << 0);
        else if (strcmp("HWWDG", CMD_ARGV[0]) == 0)
            optionbyte &= ~(1 << 0);
        else if (strcmp("NORSTSTOP", CMD_ARGV[0]) == 0)
            optionbyte |= (1 << 1);
        else if (strcmp("RSTSTOP", CMD_ARGV[0]) == 0)
            optionbyte &= ~(1 << 1);
        else if (strcmp("NORSTSTNDBY", CMD_ARGV[0]) == 0)
            optionbyte |= (1 << 2);
        else if (strcmp("RSTSTNDBY", CMD_ARGV[0]) == 0)
            optionbyte &= ~(1 << 2);
        else if (strcmp("USEROPT", CMD_ARGV[0]) == 0) {
            if (CMD_ARGC < 2)
                return ERROR_COMMAND_SYNTAX_ERROR;
            COMMAND_PARSE_NUMBER(u16, CMD_ARGV[1], useropt);
            CMD_ARGC--;
            CMD_ARGV++;
        } else if (stm32x_info->has_dual_banks) {
            if (strcmp("BOOT0", CMD_ARGV[0]) == 0)
                optionbyte |= (1 << 3);
            else if (strcmp("BOOT1", CMD_ARGV[0]) == 0)
                optionbyte &= ~(1 << 3);
            else
                return ERROR_COMMAND_SYNTAX_ERROR;
        } else
            return ERROR_COMMAND_SYNTAX_ERROR;
        CMD_ARGC--;
        CMD_ARGV++;
    }
 
    if (stm32x_erase_options(bank) != ERROR_OK) {
        command_print(CMD, "stm32x failed to erase options");
        return ERROR_OK;
    }
 
    stm32x_info->option_bytes.user = optionbyte;
    stm32x_info->option_bytes.data = useropt;
 
    if (stm32x_write_options(bank) != ERROR_OK) {
        command_print(CMD, "stm32x failed to write options");
        return ERROR_OK;
    }
 
    command_print(CMD, "stm32x write options complete.\n"
                "INFO: %spower cycle is required "
                "for the new settings to take effect.",
                stm32x_info->can_load_options
                    ? "'stm32f1x options_load' command or " : "");
 
    return ERROR_OK;
}
 
COMMAND_HANDLER(stm32x_handle_options_load_command)
{
    if (CMD_ARGC < 1)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    struct flash_bank *bank;
    int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
    if (retval != ERROR_OK)
        return retval;
 
    struct stm32x_flash_bank *stm32x_info = bank->driver_priv;
 
    if (!stm32x_info->can_load_options) {
        LOG_ERROR("Command not applicable to stm32f1x devices - power cycle is "
            "required instead.");
        return ERROR_FAIL;
    }
 
    struct target *target = bank->target;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    retval = stm32x_check_operation_supported(bank);
    if (retval != ERROR_OK)
        return retval;
 
    /* unlock option flash registers */
    retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_KEYR), KEY1);
    if (retval != ERROR_OK)
        return retval;
    retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_KEYR), KEY2);
    if (retval != ERROR_OK) {
        (void)target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_CR), FLASH_LOCK);
        return retval;
    }
 
    /* force re-load of option bytes - generates software reset */
    retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_CR), FLASH_OBL_LAUNCH);
    if (retval != ERROR_OK)
        return retval;
 
    return ERROR_OK;
}
 
static int stm32x_mass_erase(struct flash_bank *bank)
{
    struct target *target = bank->target;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    /* unlock option flash registers */
    int retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_KEYR), KEY1);
    if (retval != ERROR_OK)
        return retval;
    retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_KEYR), KEY2);
    if (retval != ERROR_OK)
        goto flash_lock;
 
    /* mass erase flash memory */
    retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_CR), FLASH_MER);
    if (retval != ERROR_OK)
        goto flash_lock;
    retval = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_CR),
            FLASH_MER | FLASH_STRT);
    if (retval != ERROR_OK)
        goto flash_lock;
 
    retval = stm32x_wait_status_busy(bank, FLASH_ERASE_TIMEOUT);
 
flash_lock:
    {
        int retval2 = target_write_u32(target, stm32x_get_flash_reg(bank, STM32_FLASH_CR), FLASH_LOCK);
        if (retval == ERROR_OK)
            retval = retval2;
    }
    return retval;
}
 
COMMAND_HANDLER(stm32x_handle_mass_erase_command)
{
    if (CMD_ARGC < 1)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    struct flash_bank *bank;
    int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
    if (retval != ERROR_OK)
        return retval;
 
    retval = stm32x_mass_erase(bank);
    if (retval == ERROR_OK)
        command_print(CMD, "stm32x mass erase complete");
    else
        command_print(CMD, "stm32x mass erase failed");
 
    return retval;
}
 
static const struct command_registration stm32f1x_exec_command_handlers[] = {
    {
        .name = "lock",
        .handler = stm32x_handle_lock_command,
        .mode = COMMAND_EXEC,
        .usage = "bank_id",
        .help = "Lock entire flash device.",
    },
    {
        .name = "unlock",
        .handler = stm32x_handle_unlock_command,
        .mode = COMMAND_EXEC,
        .usage = "bank_id",
        .help = "Unlock entire protected flash device.",
    },
    {
        .name = "mass_erase",
        .handler = stm32x_handle_mass_erase_command,
        .mode = COMMAND_EXEC,
        .usage = "bank_id",
        .help = "Erase entire flash device.",
    },
    {
        .name = "options_read",
        .handler = stm32x_handle_options_read_command,
        .mode = COMMAND_EXEC,
        .usage = "bank_id",
        .help = "Read and display device option bytes.",
    },
    {
        .name = "options_write",
        .handler = stm32x_handle_options_write_command,
        .mode = COMMAND_EXEC,
        .usage = "bank_id ('SWWDG'|'HWWDG') "
            "('RSTSTNDBY'|'NORSTSTNDBY') "
            "('RSTSTOP'|'NORSTSTOP') ('USEROPT' user_data)",
        .help = "Replace bits in device option bytes.",
    },
    {
        .name = "options_load",
        .handler = stm32x_handle_options_load_command,
        .mode = COMMAND_EXEC,
        .usage = "bank_id",
        .help = "Force re-load of device option bytes.",
    },
    COMMAND_REGISTRATION_DONE
};
 
static const struct command_registration stm32f1x_command_handlers[] = {
    {
        .name = "stm32f1x",
        .mode = COMMAND_ANY,
        .help = "stm32f1x flash command group",
        .usage = "",
        .chain = stm32f1x_exec_command_handlers,
    },
    COMMAND_REGISTRATION_DONE
};
 
const struct flash_driver stm32f1x_flash = {
    .name = "stm32f1x",
    .commands = stm32f1x_command_handlers,
    .flash_bank_command = stm32x_flash_bank_command,
    .erase = stm32x_erase,
    .protect = stm32x_protect,
    .write = stm32x_write,
    .read = default_flash_read,
    .probe = stm32x_probe,
    .auto_probe = stm32x_auto_probe,
    .erase_check = default_flash_blank_check,
    .protect_check = stm32x_protect_check,
    .info = get_stm32x_info,
    .free_driver_priv = default_flash_free_driver_priv,
};