psoc6.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *                                                                         *
 *   Copyright (C) 2018 by Bohdan Tymkiv                                   *
 *   bohdan.tymkiv@cypress.com bohdan200@gmail.com                         *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include <time.h>
 
#include "imp.h"
#include "helper/time_support.h"
#include "target/arm_adi_v5.h"
#include "target/target.h"
#include "target/cortex_m.h"
#include "target/breakpoints.h"
#include "target/algorithm.h"
 
/**************************************************************************************************
 * PSoC6 device definitions
 *************************************************************************************************/
#define MFLASH_SECTOR_SIZE              (256u * 1024u)
#define WFLASH_SECTOR_SIZE              (32u * 1024u)
 
#define MEM_BASE_MFLASH                 0x10000000u
#define MEM_BASE_WFLASH                 0x14000000u
#define MEM_WFLASH_SIZE                 32768u
#define MEM_BASE_SFLASH                 0x16000000u
#define RAM_STACK_WA_SIZE               2048u
#define PSOC6_SPCIF_GEOMETRY            0x4025F00Cu
 
#define PROTECTION_UNKNOWN              0x00u
#define PROTECTION_VIRGIN               0x01u
#define PROTECTION_NORMAL               0x02u
#define PROTECTION_SECURE               0x03u
#define PROTECTION_DEAD                 0x04u
 
#define MEM_BASE_IPC                    0x40230000u
#define IPC_STRUCT_SIZE                 0x20u
#define MEM_IPC(n)                      (MEM_BASE_IPC + (n) * IPC_STRUCT_SIZE)
#define MEM_IPC_ACQUIRE(n)              (MEM_IPC(n) + 0x00u)
#define MEM_IPC_NOTIFY(n)               (MEM_IPC(n) + 0x08u)
#define MEM_IPC_DATA(n)                 (MEM_IPC(n) + 0x0Cu)
#define MEM_IPC_LOCK_STATUS(n)          (MEM_IPC(n) + 0x10u)
 
#define MEM_BASE_IPC_INTR               0x40231000u
#define IPC_INTR_STRUCT_SIZE            0x20u
#define MEM_IPC_INTR(n)                 (MEM_BASE_IPC_INTR + (n) * IPC_INTR_STRUCT_SIZE)
#define MEM_IPC_INTR_MASK(n)            (MEM_IPC_INTR(n) + 0x08u)
#define IPC_ACQUIRE_SUCCESS_MSK         0x80000000u
#define IPC_LOCK_ACQUIRED_MSK           0x80000000u
 
#define IPC_ID                          2u
#define IPC_INTR_ID                     0u
#define IPC_TIMEOUT_MS                  1000
 
#define SROMAPI_SIID_REQ                    0x00000001u
#define SROMAPI_SIID_REQ_FAMILY_REVISION    (SROMAPI_SIID_REQ | 0x000u)
#define SROMAPI_SIID_REQ_SIID_PROTECTION    (SROMAPI_SIID_REQ | 0x100u)
#define SROMAPI_WRITEROW_REQ                0x05000100u
#define SROMAPI_PROGRAMROW_REQ              0x06000100u
#define SROMAPI_ERASESECTOR_REQ             0x14000100u
#define SROMAPI_ERASEALL_REQ                0x0A000100u
#define SROMAPI_ERASEROW_REQ                0x1C000100u
 
#define SROMAPI_STATUS_MSK                  0xF0000000u
#define SROMAPI_STAT_SUCCESS                0xA0000000u
#define SROMAPI_DATA_LOCATION_MSK           0x00000001u
#define SROMAPI_CALL_TIMEOUT_MS             1500
 
struct psoc6_target_info {
    uint32_t silicon_id;
    uint8_t protection;
    uint32_t main_flash_sz;
    uint32_t row_sz;
    bool is_probed;
};
 
struct timeout {
    int64_t start_time;
    long timeout_ms;
};
 
struct row_region {
    uint32_t addr;
    size_t size;
};
 
static const struct row_region safe_sflash_regions[] = {
    {0x16000800, 0x800},    /* SFLASH: User Data */
    {0x16001A00, 0x200},    /* SFLASH: NAR */
    {0x16005A00, 0xC00},    /* SFLASH: Public Key */
    {0x16007C00, 0x400},    /* SFLASH: TOC2 */
};
 
#define SFLASH_NUM_REGIONS ARRAY_SIZE(safe_sflash_regions)
 
static struct working_area *g_stack_area;
static struct armv7m_algorithm g_armv7m_info;
 
static void timeout_init(struct timeout *to, long timeout_ms)
{
    to->start_time = timeval_ms();
    to->timeout_ms = timeout_ms;
}
 
static bool timeout_expired(struct timeout *to)
{
    return (timeval_ms() - to->start_time) > to->timeout_ms;
}
 
static int sromalgo_prepare(struct target *target)
{
    int hr;
 
    /* Initialize Vector Table Offset register (in case FW modified it) */
    hr = target_write_u32(target, 0xE000ED08, 0x00000000);
    if (hr != ERROR_OK)
        return hr;
 
    /* Allocate Working Area for Stack and Flash algorithm */
    hr = target_alloc_working_area(target, RAM_STACK_WA_SIZE, &g_stack_area);
    if (hr != ERROR_OK)
        return hr;
 
    g_armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
    g_armv7m_info.core_mode = ARM_MODE_THREAD;
 
    struct reg_param reg_params;
    init_reg_param(&reg_params, "sp", 32, PARAM_OUT);
    buf_set_u32(reg_params.value, 0, 32, g_stack_area->address + g_stack_area->size);
 
    /* Write basic infinite loop algorithm to target RAM */
    hr = target_write_u32(target, g_stack_area->address, 0xFEE7FEE7);
    if (hr != ERROR_OK)
        goto destroy_rp_free_wa;
 
    hr = target_start_algorithm(target, 0, NULL, 1, &reg_params, g_stack_area->address,
            0, &g_armv7m_info);
    if (hr != ERROR_OK)
        goto destroy_rp_free_wa;
 
    destroy_reg_param(&reg_params);
 
    return hr;
 
destroy_rp_free_wa:
    /* Something went wrong, do some cleanup */
    destroy_reg_param(&reg_params);
 
    target_free_working_area(target, g_stack_area);
    g_stack_area = NULL;
 
    return hr;
}
 
static void sromalgo_release(struct target *target)
{
    int hr = ERROR_OK;
 
    if (g_stack_area) {
        /* Stop flash algorithm if it is running */
        if (target->running_alg) {
            hr = target_halt(target);
            if (hr != ERROR_OK)
                goto exit_free_wa;
 
            hr = target_wait_algorithm(target, 0, NULL, 0, NULL, 0,
                    IPC_TIMEOUT_MS, &g_armv7m_info);
            if (hr != ERROR_OK)
                goto exit_free_wa;
        }
 
exit_free_wa:
        /* Free Stack/Flash algorithm working area */
        target_free_working_area(target, g_stack_area);
        g_stack_area = NULL;
    }
}
 
static int ipc_poll_lock_stat(struct target *target, uint32_t ipc_id, bool lock_expected)
{
    int hr;
    uint32_t reg_val;
    struct armv7m_common *armv7m = target_to_armv7m(target);
    bool is_cm0 = (armv7m->arm.arch == ARM_ARCH_V6M);
 
    struct timeout to;
    timeout_init(&to, IPC_TIMEOUT_MS);
 
    while (!timeout_expired(&to)) {
        /* Process any server requests */
        keep_alive();
 
        /* Read IPC Lock status */
        hr = target_read_u32(target, MEM_IPC_LOCK_STATUS(ipc_id), &reg_val);
        if (hr != ERROR_OK) {
            LOG_ERROR("Unable to read IPC Lock Status register");
            return hr;
        }
 
        bool is_locked = (reg_val & IPC_LOCK_ACQUIRED_MSK) != 0;
 
        if (lock_expected == is_locked)
            return ERROR_OK;
    }
 
    if (!is_cm0) {
        LOG_WARNING("SROM API calls via CM4 target are supported on single-core PSoC6 devices only. "
            "Please perform all Flash-related operations via CM0+ target on dual-core devices.");
    }
 
    LOG_ERROR("Timeout polling IPC Lock Status");
    return ERROR_TARGET_TIMEOUT;
}
 
static int ipc_acquire(struct target *target, char ipc_id)
{
    int hr = ERROR_OK;
    bool is_acquired = false;
    uint32_t reg_val;
 
    struct timeout to;
    timeout_init(&to, IPC_TIMEOUT_MS);
 
    while (!timeout_expired(&to)) {
        keep_alive();
 
        hr = target_write_u32(target, MEM_IPC_ACQUIRE(ipc_id), IPC_ACQUIRE_SUCCESS_MSK);
        if (hr != ERROR_OK) {
            LOG_ERROR("Unable to write to IPC Acquire register");
            return hr;
        }
 
        /* Check if data is written on first step */
        hr = target_read_u32(target, MEM_IPC_ACQUIRE(ipc_id), &reg_val);
        if (hr != ERROR_OK) {
            LOG_ERROR("Unable to read IPC Acquire register");
            return hr;
        }
 
        is_acquired = (reg_val & IPC_ACQUIRE_SUCCESS_MSK) != 0;
        if (is_acquired) {
            /* If IPC structure is acquired, the lock status should be set */
            hr = ipc_poll_lock_stat(target, ipc_id, true);
            break;
        }
    }
 
    if (!is_acquired)
        LOG_ERROR("Timeout acquiring IPC structure");
 
    return hr;
}
 
static int call_sromapi(struct target *target,
    uint32_t req_and_params,
    uint32_t working_area,
    uint32_t *data_out)
{
    int hr;
 
    bool is_data_in_ram = (req_and_params & SROMAPI_DATA_LOCATION_MSK) == 0;
 
    hr = ipc_acquire(target, IPC_ID);
    if (hr != ERROR_OK)
        return hr;
 
    if (is_data_in_ram)
        hr = target_write_u32(target, MEM_IPC_DATA(IPC_ID), working_area);
    else
        hr = target_write_u32(target, MEM_IPC_DATA(IPC_ID), req_and_params);
 
    if (hr != ERROR_OK)
        return hr;
 
    /* Enable notification interrupt of IPC_INTR_STRUCT0(CM0+) for IPC_STRUCT2 */
    hr = target_write_u32(target, MEM_IPC_INTR_MASK(IPC_INTR_ID), 1u << (16 + IPC_ID));
    if (hr != ERROR_OK)
        return hr;
 
    hr = target_write_u32(target, MEM_IPC_NOTIFY(IPC_ID), 1);
    if (hr != ERROR_OK)
        return hr;
 
    /* Poll lock status */
    hr = ipc_poll_lock_stat(target, IPC_ID, false);
    if (hr != ERROR_OK)
        return hr;
 
    /* Poll Data byte */
    if (is_data_in_ram)
        hr = target_read_u32(target, working_area, data_out);
    else
        hr = target_read_u32(target, MEM_IPC_DATA(IPC_ID), data_out);
 
    if (hr != ERROR_OK) {
        LOG_ERROR("Error reading SROM API Status location");
        return hr;
    }
 
    bool is_success = (*data_out & SROMAPI_STATUS_MSK) == SROMAPI_STAT_SUCCESS;
    if (!is_success) {
        LOG_ERROR("SROM API execution failed. Status: 0x%08" PRIX32, *data_out);
        return ERROR_TARGET_FAILURE;
    }
 
    return ERROR_OK;
}
 
static int get_silicon_id(struct target *target, uint32_t *si_id, uint8_t *protection)
{
    int hr;
    uint32_t family_rev, siid_prot;
 
    hr = sromalgo_prepare(target);
    if (hr != ERROR_OK)
        goto exit;
 
    /* Read FamilyID and Revision */
    hr = call_sromapi(target, SROMAPI_SIID_REQ_FAMILY_REVISION, 0, &family_rev);
    if (hr != ERROR_OK)
        goto exit;
 
    /* Read SiliconID and Protection */
    hr = call_sromapi(target, SROMAPI_SIID_REQ_SIID_PROTECTION, 0, &siid_prot);
    if (hr != ERROR_OK)
        goto exit;
 
    *si_id  = (siid_prot & 0x0000FFFF) << 16;
    *si_id |= (family_rev & 0x00FF0000) >> 8;
    *si_id |= (family_rev & 0x000000FF) >> 0;
 
    *protection = (siid_prot & 0x000F0000) >> 0x10;
 
exit:
    sromalgo_release(target);
    return ERROR_OK;
}
 
static int psoc6_protect_check(struct flash_bank *bank)
{
    int is_protected;
 
    struct psoc6_target_info *psoc6_info = bank->driver_priv;
    int hr = get_silicon_id(bank->target, &psoc6_info->silicon_id, &psoc6_info->protection);
    if (hr != ERROR_OK)
        return hr;
 
    switch (psoc6_info->protection) {
        case PROTECTION_VIRGIN:
        case PROTECTION_NORMAL:
            is_protected = 0;
            break;
 
        case PROTECTION_UNKNOWN:
        case PROTECTION_SECURE:
        case PROTECTION_DEAD:
        default:
            is_protected = 1;
            break;
    }
 
    for (unsigned int i = 0; i < bank->num_sectors; i++)
        bank->sectors[i].is_protected = is_protected;
 
    return ERROR_OK;
}
 
static int psoc6_protect(struct flash_bank *bank, int set, unsigned int first,
        unsigned int last)
{
    (void)bank;
    (void)set;
    (void)first;
    (void)last;
 
    LOG_WARNING("Life Cycle transition for PSoC6 is not supported");
    return ERROR_OK;
}
 
static const char *protection_to_str(uint8_t protection)
{
    switch (protection) {
        case PROTECTION_VIRGIN:
            return "VIRGIN";
        case PROTECTION_NORMAL:
            return "NORMAL";
        case PROTECTION_SECURE:
            return "SECURE";
        case PROTECTION_DEAD:
            return "DEAD";
        case PROTECTION_UNKNOWN:
        default:
            return "UNKNOWN";
    }
}
 
static int psoc6_get_info(struct flash_bank *bank, struct command_invocation *cmd)
{
    struct psoc6_target_info *psoc6_info = bank->driver_priv;
 
    if (!psoc6_info->is_probed)
        return ERROR_FAIL;
 
    int hr = get_silicon_id(bank->target, &psoc6_info->silicon_id, &psoc6_info->protection);
    if (hr != ERROR_OK)
        return hr;
 
    command_print_sameline(cmd,
        "PSoC6 Silicon ID: 0x%08" PRIX32 "\n"
        "Protection: %s\n"
        "Main Flash size: %" PRIu32 " kB\n"
        "Work Flash size: 32 kB\n",
        psoc6_info->silicon_id,
        protection_to_str(psoc6_info->protection),
        psoc6_info->main_flash_sz / 1024);
 
    return ERROR_OK;
}
 
static bool is_sflash_bank(struct flash_bank *bank)
{
    for (size_t i = 0; i < SFLASH_NUM_REGIONS; i++) {
        if (bank->base == safe_sflash_regions[i].addr)
            return true;
    }
 
    return false;
}
 
static inline bool is_wflash_bank(struct flash_bank *bank)
{
    return (bank->base == MEM_BASE_WFLASH);
}
 
static inline bool is_mflash_bank(struct flash_bank *bank)
{
    return (bank->base == MEM_BASE_MFLASH);
}
 
static int psoc6_probe(struct flash_bank *bank)
{
    struct target *target = bank->target;
    struct psoc6_target_info *psoc6_info = bank->driver_priv;
 
    int hr = ERROR_OK;
 
    /* Retrieve data from SPCIF_GEOMETRY */
    uint32_t geom;
    target_read_u32(target, PSOC6_SPCIF_GEOMETRY, &geom);
    uint32_t row_sz_lg2 = (geom & 0xF0) >> 4;
    uint32_t row_sz = (0x01 << row_sz_lg2);
    uint32_t row_cnt = 1 + ((geom & 0x00FFFF00) >> 8);
    uint32_t bank_cnt = 1 + ((geom & 0xFF000000) >> 24);
 
    /* Calculate size of Main Flash*/
    uint32_t flash_sz_bytes = bank_cnt * row_cnt * row_sz;
 
    free(bank->sectors);
    bank->sectors = NULL;
 
    size_t bank_size = 0;
 
    if (is_mflash_bank(bank))
        bank_size = flash_sz_bytes;
    else if (is_wflash_bank(bank))
        bank_size = MEM_WFLASH_SIZE;
    else if (is_sflash_bank(bank)) {
        for (size_t i = 0; i < SFLASH_NUM_REGIONS; i++) {
            if (safe_sflash_regions[i].addr == bank->base) {
                bank_size = safe_sflash_regions[i].size;
                break;
            }
        }
    }
 
    if (bank_size == 0) {
        LOG_ERROR("Invalid Flash Bank base address in config file");
        return ERROR_FLASH_BANK_INVALID;
    }
 
    unsigned int num_sectors = bank_size / row_sz;
    bank->size = bank_size;
 
    bank->erased_value = 0;
    bank->default_padded_value = 0;
 
    bank->num_sectors = num_sectors;
    bank->sectors = calloc(num_sectors, sizeof(struct flash_sector));
    for (unsigned int i = 0; i < num_sectors; i++) {
        bank->sectors[i].size = row_sz;
        bank->sectors[i].offset = i * row_sz;
        bank->sectors[i].is_erased = -1;
        bank->sectors[i].is_protected = -1;
    }
 
    psoc6_info->is_probed = true;
    psoc6_info->main_flash_sz = flash_sz_bytes;
    psoc6_info->row_sz = row_sz;
 
    return hr;
}
 
static int psoc6_auto_probe(struct flash_bank *bank)
{
    struct psoc6_target_info *psoc6_info = bank->driver_priv;
    int hr;
 
    if (psoc6_info->is_probed)
        hr = ERROR_OK;
    else
        hr = psoc6_probe(bank);
 
    return hr;
}
 
static int psoc6_erase_sector(struct flash_bank *bank, struct working_area *wa, uint32_t addr)
{
    struct target *target = bank->target;
 
    LOG_DEBUG("Erasing SECTOR @%08" PRIX32, addr);
 
    int hr = target_write_u32(target, wa->address, SROMAPI_ERASESECTOR_REQ);
    if (hr != ERROR_OK)
        return hr;
 
    hr = target_write_u32(target, wa->address + 0x04, addr);
    if (hr != ERROR_OK)
        return hr;
 
    uint32_t data_out;
    hr = call_sromapi(target, SROMAPI_ERASESECTOR_REQ, wa->address, &data_out);
    if (hr != ERROR_OK)
        LOG_ERROR("SECTOR @%08" PRIX32 " not erased!", addr);
 
    return hr;
}
 
static int psoc6_erase_row(struct flash_bank *bank, struct working_area *wa, uint32_t addr)
{
    struct target *target = bank->target;
 
    LOG_DEBUG("Erasing ROW @%08" PRIX32, addr);
 
    int hr = target_write_u32(target, wa->address, SROMAPI_ERASEROW_REQ);
    if (hr != ERROR_OK)
        return hr;
 
    hr = target_write_u32(target, wa->address + 0x04, addr);
    if (hr != ERROR_OK)
        return hr;
 
    uint32_t data_out;
    hr = call_sromapi(target, SROMAPI_ERASEROW_REQ, wa->address, &data_out);
    if (hr != ERROR_OK)
        LOG_ERROR("ROW @%08" PRIX32 " not erased!", addr);
 
    return hr;
}
 
static int psoc6_erase(struct flash_bank *bank, unsigned int first,
        unsigned int last)
{
    struct target *target = bank->target;
    struct psoc6_target_info *psoc6_info = bank->driver_priv;
    const uint32_t sector_size = is_wflash_bank(bank) ? WFLASH_SECTOR_SIZE : MFLASH_SECTOR_SIZE;
 
    int hr;
    struct working_area *wa;
 
    if (is_sflash_bank(bank)) {
        LOG_INFO("Erase operation on Supervisory Flash is not required, skipping");
        return ERROR_OK;
    }
 
    hr = sromalgo_prepare(target);
    if (hr != ERROR_OK)
        goto exit;
 
    hr = target_alloc_working_area(target, psoc6_info->row_sz + 32, &wa);
    if (hr != ERROR_OK)
        goto exit;
 
    /* Number of rows in single sector */
    const unsigned int rows_in_sector = sector_size / psoc6_info->row_sz;
 
    while (last >= first) {
        /* Erase Sector if we are on sector boundary and erase size covers whole sector */
        if ((first % rows_in_sector) == 0 &&
            (last - first + 1) >= rows_in_sector) {
            hr = psoc6_erase_sector(bank, wa, bank->base + first * psoc6_info->row_sz);
            if (hr != ERROR_OK)
                goto exit_free_wa;
 
            first += rows_in_sector;
        } else {
            /* Perform Row Erase otherwise */
            hr = psoc6_erase_row(bank, wa, bank->base + first * psoc6_info->row_sz);
            if (hr != ERROR_OK)
                goto exit_free_wa;
 
            first += 1;
        }
    }
 
exit_free_wa:
    target_free_working_area(target, wa);
exit:
    sromalgo_release(target);
    return hr;
}
 
static int psoc6_program_row(struct flash_bank *bank,
    uint32_t addr,
    const uint8_t *buffer,
    bool is_sflash)
{
    struct target *target = bank->target;
    struct psoc6_target_info *psoc6_info = bank->driver_priv;
    struct working_area *wa;
    const uint32_t sromapi_req = is_sflash ? SROMAPI_WRITEROW_REQ : SROMAPI_PROGRAMROW_REQ;
    uint32_t data_out;
    int hr = ERROR_OK;
 
    LOG_DEBUG("Programming ROW @%08" PRIX32, addr);
 
    hr = target_alloc_working_area(target, psoc6_info->row_sz + 32, &wa);
    if (hr != ERROR_OK)
        goto exit;
 
    hr = target_write_u32(target, wa->address, sromapi_req);
    if (hr != ERROR_OK)
        goto exit_free_wa;
 
    hr = target_write_u32(target,
            wa->address + 0x04,
            0x106);
    if (hr != ERROR_OK)
        goto exit_free_wa;
 
    hr = target_write_u32(target, wa->address + 0x08, addr);
    if (hr != ERROR_OK)
        goto exit_free_wa;
 
    hr = target_write_u32(target, wa->address + 0x0C, wa->address + 0x10);
    if (hr != ERROR_OK)
        goto exit_free_wa;
 
    hr = target_write_buffer(target, wa->address + 0x10, psoc6_info->row_sz, buffer);
    if (hr != ERROR_OK)
        goto exit_free_wa;
 
    hr = call_sromapi(target, sromapi_req, wa->address, &data_out);
 
exit_free_wa:
    target_free_working_area(target, wa);
 
exit:
    return hr;
}
 
static int psoc6_program(struct flash_bank *bank,
    const uint8_t *buffer,
    uint32_t offset,
    uint32_t count)
{
    struct target *target = bank->target;
    struct psoc6_target_info *psoc6_info = bank->driver_priv;
    const bool is_sflash = is_sflash_bank(bank);
    int hr;
 
    uint8_t page_buf[psoc6_info->row_sz];
 
    hr = sromalgo_prepare(target);
    if (hr != ERROR_OK)
        goto exit;
 
    while (count) {
        uint32_t row_offset = offset % psoc6_info->row_sz;
        uint32_t aligned_addr = bank->base + offset - row_offset;
        uint32_t row_bytes = MIN(psoc6_info->row_sz - row_offset, count);
 
        memset(page_buf, 0, sizeof(page_buf));
        memcpy(&page_buf[row_offset], buffer, row_bytes);
 
        hr = psoc6_program_row(bank, aligned_addr, page_buf, is_sflash);
        if (hr != ERROR_OK) {
            LOG_ERROR("Failed to program Flash at address 0x%08" PRIX32, aligned_addr);
            goto exit;
        }
 
        buffer += row_bytes;
        offset += row_bytes;
        count -= row_bytes;
    }
 
exit:
    sromalgo_release(target);
    return hr;
}
 
COMMAND_HANDLER(psoc6_handle_mass_erase_command)
{
    if (CMD_ARGC != 1)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    struct flash_bank *bank;
    int hr = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
    if (hr != ERROR_OK)
        return hr;
 
    hr = psoc6_erase(bank, 0, bank->num_sectors - 1);
 
    return hr;
}
 
static int handle_reset_halt(struct target *target)
{
    int hr;
    uint32_t reset_addr;
    struct armv7m_common *armv7m = target_to_armv7m(target);
    bool is_cm0 = (armv7m->arm.arch == ARM_ARCH_V6M);
 
    /* Halt target device */
    if (target->state != TARGET_HALTED) {
        hr = target_halt(target);
        if (hr != ERROR_OK)
            return hr;
 
        target_wait_state(target, TARGET_HALTED, IPC_TIMEOUT_MS);
        if (hr != ERROR_OK)
            return hr;
    }
 
    /* Read Vector Offset register */
    uint32_t vt_base;
    const uint32_t vt_offset_reg = is_cm0 ? 0x402102B0 : 0x402102C0;
    hr = target_read_u32(target, vt_offset_reg, &vt_base);
    if (hr != ERROR_OK)
        return ERROR_OK;
 
    /* Invalid value means flash is empty */
    vt_base &= 0xFFFFFF00;
    if ((vt_base == 0) || (vt_base == 0xFFFFFF00))
        return ERROR_OK;
 
    /* Read Reset Vector value*/
    hr = target_read_u32(target, vt_base + 4, &reset_addr);
    if (hr != ERROR_OK)
        return hr;
 
    /* Invalid value means flash is empty */
    if ((reset_addr == 0) || (reset_addr == 0xFFFFFF00))
        return ERROR_OK;
 
 
    /* Set breakpoint at User Application entry point */
    hr = breakpoint_add(target, reset_addr, 2, BKPT_HARD);
    if (hr != ERROR_OK)
        return hr;
 
    const struct armv7m_common *cm = target_to_armv7m(target);
 
    /* PSoC6 reboots immediately after issuing SYSRESETREQ / VECTRESET
     * this disables SWD/JTAG pins momentarily and may break communication
     * Ignoring return value of mem_ap_write_atomic_u32 seems to be ok here */
    if (is_cm0) {
        /* Reset the CM0 by asserting SYSRESETREQ. This will also reset CM4 */
        LOG_INFO("psoc6.cm0: bkpt @0x%08" PRIX32 ", issuing SYSRESETREQ", reset_addr);
        mem_ap_write_atomic_u32(cm->debug_ap, NVIC_AIRCR,
            AIRCR_VECTKEY | AIRCR_SYSRESETREQ);
    } else {
        LOG_INFO("psoc6.cm4: bkpt @0x%08" PRIX32 ", issuing VECTRESET", reset_addr);
        mem_ap_write_atomic_u32(cm->debug_ap, NVIC_AIRCR,
            AIRCR_VECTKEY | AIRCR_VECTRESET);
    }
 
    /* Wait 100ms for bootcode and reinitialize DAP */
    usleep(100000);
    dap_dp_init(cm->debug_ap->dap);
 
    target_wait_state(target, TARGET_HALTED, IPC_TIMEOUT_MS);
 
    /* Remove the break point */
    breakpoint_remove(target, reset_addr);
 
    return ERROR_OK;
}
 
COMMAND_HANDLER(psoc6_handle_reset_halt)
{
    if (CMD_ARGC)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    struct target *target = get_current_target(CMD_CTX);
    return handle_reset_halt(target);
}
 
FLASH_BANK_COMMAND_HANDLER(psoc6_flash_bank_command)
{
    struct psoc6_target_info *psoc6_info;
    int hr = ERROR_OK;
 
    if (CMD_ARGC < 6)
        hr = ERROR_COMMAND_SYNTAX_ERROR;
    else {
        psoc6_info = calloc(1, sizeof(struct psoc6_target_info));
        psoc6_info->is_probed = false;
        bank->driver_priv = psoc6_info;
    }
    return hr;
}
 
static const struct command_registration psoc6_exec_command_handlers[] = {
    {
        .name = "mass_erase",
        .handler = psoc6_handle_mass_erase_command,
        .mode = COMMAND_EXEC,
        .usage = "bank",
        .help = "Erases entire Main Flash",
    },
    {
        .name = "reset_halt",
        .handler = psoc6_handle_reset_halt,
        .mode = COMMAND_EXEC,
        .usage = "",
        .help = "Tries to simulate broken Vector Catch",
    },
    COMMAND_REGISTRATION_DONE
};
 
static const struct command_registration psoc6_command_handlers[] = {
    {
        .name = "psoc6",
        .mode = COMMAND_ANY,
        .help = "PSoC 6 flash command group",
        .usage = "",
        .chain = psoc6_exec_command_handlers,
    },
    COMMAND_REGISTRATION_DONE
};
 
const struct flash_driver psoc6_flash = {
    .name = "psoc6",
    .commands = psoc6_command_handlers,
    .flash_bank_command = psoc6_flash_bank_command,
    .erase = psoc6_erase,
    .protect = psoc6_protect,
    .write = psoc6_program,
    .read = default_flash_read,
    .probe = psoc6_probe,
    .auto_probe = psoc6_auto_probe,
    .erase_check = default_flash_blank_check,
    .protect_check = psoc6_protect_check,
    .info = psoc6_get_info,
    .free_driver_priv = default_flash_free_driver_priv,
};