msp432.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *   Copyright (C) 2018 by Texas Instruments, Inc.                         *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "imp.h"
#include "msp432.h"
#include <helper/binarybuffer.h>
#include <helper/time_support.h>
#include <target/algorithm.h>
#include <target/armv7m.h>
#include <target/image.h>
 
/* MSP432P4 hardware registers */
#define P4_FLASH_MAIN_SIZE_REG 0xE0043020
#define P4_FLASH_INFO_SIZE_REG 0xE0043024
#define P4_DEVICE_ID_REG       0x0020100C
#define P4_HARDWARE_REV_REG    0x00201010
 
/* MSP432E4 hardware registers */
#define E4_DID0_REG 0x400FE000
#define E4_DID1_REG 0x400FE004
 
#define FLASH_TIMEOUT 8000
 
#define SUPPORT_MESSAGE \
    "Your pre-production MSP432P401x silicon is not fully supported\n" \
    "You can find more information at www.ti.com/product/MSP432P401R"
 
struct msp432_bank {
    uint32_t device_id;
    uint32_t hardware_rev;
    int family_type;
    int device_type;
    uint32_t sector_length;
    bool probed_main;
    bool probed_info;
    bool unlock_bsl;
    struct working_area *working_area;
    struct armv7m_algorithm armv7m_info;
};
 
/* Flash helper algorithm for MSP432P401x targets */
static const uint8_t msp432p401x_algo[] = {
#include "../../../contrib/loaders/flash/msp432/msp432p401x_algo.inc"
};
 
/* Flash helper algorithm for MSP432P411x targets */
static const uint8_t msp432p411x_algo[] = {
#include "../../../contrib/loaders/flash/msp432/msp432p411x_algo.inc"
};
 
/* Flash helper algorithm for MSP432E4x targets */
static const uint8_t msp432e4x_algo[] = {
#include "../../../contrib/loaders/flash/msp432/msp432e4x_algo.inc"
};
 
static int msp432_auto_probe(struct flash_bank *bank);
 
static int msp432_device_type(uint32_t family_type, uint32_t device_id,
    uint32_t hardware_rev)
{
    int device_type = MSP432_NO_TYPE;
 
    if (family_type == MSP432E4) {
        /* MSP432E4 device family */
 
        if (device_id == 0x180C0002) {
            if (hardware_rev == 0x102DC06E) {
                /* The 01Y variant */
                device_type = MSP432E401Y;
            } else if (hardware_rev == 0x1032E076) {
                /* The 11Y variant */
                device_type = MSP432E411Y;
            } else {
                /* Reasonable guess that this is a new variant */
                device_type = MSP432E4X_GUESS;
            }
        } else {
            /* Wild guess that this is an MSP432E4 */
            device_type = MSP432E4X_GUESS;
        }
    } else {
        /* MSP432P4 device family */
 
        /* Examine the device ID and hardware revision to get the device type */
        switch (device_id) {
        case 0xA000:
        case 0xA001:
        case 0xA002:
        case 0xA003:
        case 0xA004:
        case 0xA005:
            /* Device is definitely MSP432P401x, check hardware revision */
            if (hardware_rev == 0x41 || hardware_rev == 0x42) {
                /* Rev A or B of the silicon has been deprecated */
                device_type = MSP432P401X_DEPR;
            } else if (hardware_rev >= 0x43 && hardware_rev <= 0x49) {
                /* Current and future revisions of the MSP432P401x device */
                device_type = MSP432P401X;
            } else {
                /* Unknown or unanticipated hardware revision */
                device_type = MSP432P401X_GUESS;
            }
            break;
        case 0xA010:
        case 0xA012:
        case 0xA016:
        case 0xA019:
        case 0xA01F:
        case 0xA020:
        case 0xA022:
        case 0xA026:
        case 0xA029:
        case 0xA02F:
            /* Device is definitely MSP432P411x, check hardware revision */
            if (hardware_rev >= 0x41 && hardware_rev <= 0x49) {
                /* Current and future revisions of the MSP432P411x device */
                device_type = MSP432P411X;
            } else {
                /* Unknown or unanticipated hardware revision */
                device_type = MSP432P411X_GUESS;
            }
            break;
        case 0xFFFF:
            /* Device is very early silicon that has been deprecated */
            device_type = MSP432P401X_DEPR;
            break;
        default:
            if (device_id < 0xA010) {
                /* Wild guess that this is an MSP432P401x */
                device_type = MSP432P401X_GUESS;
            } else {
                /* Reasonable guess that this is a new variant */
                device_type = MSP432P411X_GUESS;
            }
            break;
        }
    }
 
    return device_type;
}
 
static const char *msp432_return_text(uint32_t return_code)
{
    switch (return_code) {
    case FLASH_BUSY:
        return "FLASH_BUSY";
    case FLASH_SUCCESS:
        return "FLASH_SUCCESS";
    case FLASH_ERROR:
        return "FLASH_ERROR";
    case FLASH_TIMEOUT_ERROR:
        return "FLASH_TIMEOUT_ERROR";
    case FLASH_VERIFY_ERROR:
        return "FLASH_VERIFY_WRONG";
    case FLASH_WRONG_COMMAND:
        return "FLASH_WRONG_COMMAND";
    case FLASH_POWER_ERROR:
        return "FLASH_POWER_ERROR";
    default:
        return "UNDEFINED_RETURN_CODE";
    }
}
 
static void msp432_init_params(struct msp432_algo_params *algo_params)
{
    buf_set_u32(algo_params->flash_command, 0, 32, FLASH_NO_COMMAND);
    buf_set_u32(algo_params->return_code, 0, 32, 0);
    buf_set_u32(algo_params->_reserved0, 0, 32, 0);
    buf_set_u32(algo_params->address, 0, 32, 0);
    buf_set_u32(algo_params->length, 0, 32, 0);
    buf_set_u32(algo_params->buffer1_status, 0, 32, BUFFER_INACTIVE);
    buf_set_u32(algo_params->buffer2_status, 0, 32, BUFFER_INACTIVE);
    buf_set_u32(algo_params->erase_param, 0, 32, FLASH_ERASE_MAIN);
    buf_set_u32(algo_params->unlock_bsl, 0, 32, FLASH_LOCK_BSL);
}
 
static int msp432_exec_cmd(struct target *target, struct msp432_algo_params
            *algo_params, uint32_t command)
{
    int retval;
 
    /* Make sure the given params do not include the command */
    buf_set_u32(algo_params->flash_command, 0, 32, FLASH_NO_COMMAND);
    buf_set_u32(algo_params->return_code, 0, 32, 0);
    buf_set_u32(algo_params->buffer1_status, 0, 32, BUFFER_INACTIVE);
    buf_set_u32(algo_params->buffer2_status, 0, 32, BUFFER_INACTIVE);
 
    /* Write out parameters to target memory */
    retval = target_write_buffer(target, ALGO_PARAMS_BASE_ADDR,
                sizeof(struct msp432_algo_params), (uint8_t *)algo_params);
    if (retval != ERROR_OK)
        return retval;
 
    /* Write out command to target memory */
    return target_write_u32(target, ALGO_FLASH_COMMAND_ADDR, command);
}
 
static int msp432_wait_return_code(struct target *target)
{
    uint32_t return_code = 0;
    long long start_ms;
    long long elapsed_ms;
 
    int retval = ERROR_OK;
 
    start_ms = timeval_ms();
    while ((return_code == 0) || (return_code == FLASH_BUSY)) {
        retval = target_read_u32(target, ALGO_RETURN_CODE_ADDR, &return_code);
        if (retval != ERROR_OK)
            return retval;
 
        elapsed_ms = timeval_ms() - start_ms;
        if (elapsed_ms > FLASH_TIMEOUT)
            break;
 
        keep_alive();
    };
 
    if (return_code != FLASH_SUCCESS) {
        LOG_ERROR("msp432: Flash operation failed: %s",
            msp432_return_text(return_code));
        return ERROR_FAIL;
    }
 
    return ERROR_OK;
}
 
static int msp432_wait_inactive(struct target *target, uint32_t buffer)
{
    uint32_t status_code = BUFFER_ACTIVE;
    uint32_t status_addr;
    long long start_ms;
    long long elapsed_ms;
 
    int retval;
 
    switch (buffer) {
    case 1: /* Buffer 1 */
        status_addr = ALGO_BUFFER1_STATUS_ADDR;
        break;
    case 2: /* Buffer 2 */
        status_addr = ALGO_BUFFER2_STATUS_ADDR;
        break;
    default:
        return ERROR_FAIL;
    }
 
    start_ms = timeval_ms();
    while (status_code != BUFFER_INACTIVE) {
        retval = target_read_u32(target, status_addr, &status_code);
        if (retval != ERROR_OK)
            return retval;
 
        elapsed_ms = timeval_ms() - start_ms;
        if (elapsed_ms > FLASH_TIMEOUT)
            break;
 
        keep_alive();
    };
 
    if (status_code != BUFFER_INACTIVE) {
        LOG_ERROR(
            "msp432: Flash operation failed: buffer not written to flash");
        return ERROR_FAIL;
    }
 
    return ERROR_OK;
}
 
static int msp432_init(struct flash_bank *bank)
{
    struct target *target = bank->target;
    struct msp432_bank *msp432_bank = bank->driver_priv;
    struct msp432_algo_params algo_params;
    struct reg_param reg_params[1];
 
    const uint8_t *loader_code;
    uint32_t loader_size;
    uint32_t algo_entry_addr;
    int retval;
 
    /* Make sure we've probed the flash to get the device and size */
    retval = msp432_auto_probe(bank);
    if (retval != ERROR_OK)
        return retval;
 
    /* Choose appropriate flash helper algorithm */
    switch (msp432_bank->device_type) {
    case MSP432P401X:
    case MSP432P401X_DEPR:
    case MSP432P401X_GUESS:
    default:
        loader_code = msp432p401x_algo;
        loader_size = sizeof(msp432p401x_algo);
        algo_entry_addr = P4_ALGO_ENTRY_ADDR;
        break;
    case MSP432P411X:
    case MSP432P411X_GUESS:
        loader_code = msp432p411x_algo;
        loader_size = sizeof(msp432p411x_algo);
        algo_entry_addr = P4_ALGO_ENTRY_ADDR;
        break;
    case MSP432E401Y:
    case MSP432E411Y:
    case MSP432E4X_GUESS:
        loader_code = msp432e4x_algo;
        loader_size = sizeof(msp432e4x_algo);
        algo_entry_addr = E4_ALGO_ENTRY_ADDR;
        break;
    }
 
    /* Issue warnings if this is a device we may not be able to flash */
    if (msp432_bank->device_type == MSP432P401X_GUESS ||
        msp432_bank->device_type == MSP432P411X_GUESS) {
        /* Explicit device type check failed. Report this. */
        LOG_WARNING(
            "msp432: Unrecognized MSP432P4 Device ID and Hardware "
            "Rev (%04" PRIX32 ", %02" PRIX32 ")", msp432_bank->device_id,
            msp432_bank->hardware_rev);
    } else if (msp432_bank->device_type == MSP432P401X_DEPR) {
        LOG_WARNING(
            "msp432: MSP432P401x pre-production device (deprecated "
            "silicon)\n" SUPPORT_MESSAGE);
    } else if (msp432_bank->device_type == MSP432E4X_GUESS) {
        /* Explicit device type check failed. Report this. */
        LOG_WARNING(
            "msp432: Unrecognized MSP432E4 DID0 and DID1 values "
            "(%08" PRIX32 ", %08" PRIX32 ")", msp432_bank->device_id,
            msp432_bank->hardware_rev);
    }
 
    /* Check for working area to use for flash helper algorithm */
    target_free_working_area(target, msp432_bank->working_area);
    msp432_bank->working_area = NULL;
 
    retval = target_alloc_working_area(target, ALGO_WORKING_SIZE,
                &msp432_bank->working_area);
    if (retval != ERROR_OK)
        return retval;
 
    /* Confirm the defined working address is the area we need to use */
    if (msp432_bank->working_area->address != ALGO_BASE_ADDR)
        return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
 
    /* Write flash helper algorithm into target memory */
    retval = target_write_buffer(target, ALGO_BASE_ADDR, loader_size,
                loader_code);
    if (retval != ERROR_OK)
        return retval;
 
    /* Initialize the ARMv7 specific info to run the algorithm */
    msp432_bank->armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
    msp432_bank->armv7m_info.core_mode = ARM_MODE_THREAD;
 
    /* Initialize algorithm parameters to default values */
    msp432_init_params(&algo_params);
 
    /* Write out parameters to target memory */
    retval = target_write_buffer(target, ALGO_PARAMS_BASE_ADDR,
                sizeof(algo_params), (uint8_t *)&algo_params);
    if (retval != ERROR_OK)
        return retval;
 
    /* Initialize stack pointer for flash helper algorithm */
    init_reg_param(&reg_params[0], "sp", 32, PARAM_OUT);
    buf_set_u32(reg_params[0].value, 0, 32, ALGO_STACK_POINTER_ADDR);
 
    /* Begin executing the flash helper algorithm */
    retval = target_start_algorithm(target, 0, NULL, 1, reg_params,
                algo_entry_addr, 0, &msp432_bank->armv7m_info);
    destroy_reg_param(&reg_params[0]);
    if (retval != ERROR_OK) {
        LOG_ERROR("msp432: Failed to start flash helper algorithm");
        return retval;
    }
 
    /*
     * At this point, the algorithm is running on the target and
     * ready to receive commands and data to flash the target
     */
 
    /* Issue the init command to the flash helper algorithm */
    retval = msp432_exec_cmd(target, &algo_params, FLASH_INIT);
    if (retval != ERROR_OK)
        return retval;
 
    return msp432_wait_return_code(target);
}
 
static int msp432_quit(struct flash_bank *bank)
{
    struct target *target = bank->target;
    struct msp432_bank *msp432_bank = bank->driver_priv;
    struct msp432_algo_params algo_params;
 
    int retval;
 
    /* Initialize algorithm parameters to default values */
    msp432_init_params(&algo_params);
 
    /* Issue the exit command to the flash helper algorithm */
    retval = msp432_exec_cmd(target, &algo_params, FLASH_EXIT);
    if (retval != ERROR_OK)
        return retval;
 
    (void)msp432_wait_return_code(target);
 
    /* Regardless of the return code, attempt to halt the target */
    (void)target_halt(target);
 
    /* Now confirm target halted and clean up from flash helper algorithm */
    retval = target_wait_algorithm(target, 0, NULL, 0, NULL, 0, FLASH_TIMEOUT,
                &msp432_bank->armv7m_info);
 
    target_free_working_area(target, msp432_bank->working_area);
    msp432_bank->working_area = NULL;
 
    return retval;
}
 
static int msp432_mass_erase(struct flash_bank *bank, bool all)
{
    struct target *target = bank->target;
    struct msp432_bank *msp432_bank = bank->driver_priv;
    struct msp432_algo_params algo_params;
 
    int retval;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    retval = msp432_init(bank);
    if (retval != ERROR_OK)
        return retval;
 
    /* Initialize algorithm parameters to default values */
    msp432_init_params(&algo_params);
    if (all) {
        buf_set_u32(algo_params.erase_param, 0, 32,
            FLASH_ERASE_MAIN | FLASH_ERASE_INFO);
        if (msp432_bank->unlock_bsl)
            buf_set_u32(algo_params.unlock_bsl, 0, 32, FLASH_UNLOCK_BSL);
    }
 
    /* Issue the mass erase command to the flash helper algorithm */
    retval = msp432_exec_cmd(target, &algo_params, FLASH_MASS_ERASE);
    if (retval != ERROR_OK) {
        (void)msp432_quit(bank);
        return retval;
    }
 
    retval = msp432_wait_return_code(target);
    if (retval != ERROR_OK) {
        (void)msp432_quit(bank);
        return retval;
    }
 
    retval = msp432_quit(bank);
    if (retval != ERROR_OK)
        return retval;
 
    return retval;
}
 
COMMAND_HANDLER(msp432_mass_erase_command)
{
    struct flash_bank *bank;
    struct msp432_bank *msp432_bank;
    bool all;
 
    int retval;
 
    if (1 > CMD_ARGC)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
    if (retval != ERROR_OK)
        return retval;
 
    if (1 == CMD_ARGC) {
        all = false;
    } else if (2 == CMD_ARGC) {
        /* Check argument for how much to erase */
        if (strcmp(CMD_ARGV[1], "main") == 0)
            all = false;
        else if (strcmp(CMD_ARGV[1], "all") == 0)
            all = true;
        else
            return ERROR_COMMAND_SYNTAX_ERROR;
    } else {
        return ERROR_COMMAND_SYNTAX_ERROR;
    }
 
    msp432_bank = bank->driver_priv;
 
    if (msp432_bank->family_type == MSP432E4) {
        /* MSP432E4 does not have main vs info regions, ignore "all" */
        all = false;
    }
 
    retval = msp432_mass_erase(bank, all);
    if (retval != ERROR_OK)
        return retval;
 
    if (msp432_bank->family_type == MSP432E4) {
        /* MSP432E4 does not have main vs info regions */
        LOG_INFO("msp432: Mass erase of flash is complete");
    } else {
        LOG_INFO("msp432: Mass erase of %s is complete",
            all ? "main + information flash" : "main flash");
    }
 
    return ERROR_OK;
}
 
COMMAND_HANDLER(msp432_bsl_command)
{
    struct flash_bank *bank;
    struct msp432_bank *msp432_bank;
 
    int retval;
 
    if (1 > CMD_ARGC)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
    if (retval != ERROR_OK)
        return retval;
 
    msp432_bank = bank->driver_priv;
 
    if (msp432_bank->family_type == MSP432E4) {
        LOG_WARNING("msp432: MSP432E4 does not have a BSL region");
        return ERROR_OK;
    }
 
    if (2 == CMD_ARGC) {
        if (strcmp(CMD_ARGV[1], "lock") == 0)
            msp432_bank->unlock_bsl = false;
        else if (strcmp(CMD_ARGV[1], "unlock") == 0)
            msp432_bank->unlock_bsl = true;
        else
            return ERROR_COMMAND_SYNTAX_ERROR;
    } else if (1 != CMD_ARGC) {
        /* Extra, unknown argument passed in */
        return ERROR_COMMAND_SYNTAX_ERROR;
    }
 
    LOG_INFO("msp432: BSL flash region is currently %slocked",
        msp432_bank->unlock_bsl ? "un" : "");
 
    return ERROR_OK;
}
 
FLASH_BANK_COMMAND_HANDLER(msp432_flash_bank_command)
{
    struct msp432_bank *msp432_bank;
 
    if (CMD_ARGC < 6)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    /* Create shared private struct for flash banks */
    msp432_bank = malloc(sizeof(struct msp432_bank));
    if (!msp432_bank)
        return ERROR_FAIL;
 
    /* Initialize private flash information */
    msp432_bank->device_id = 0;
    msp432_bank->hardware_rev = 0;
    msp432_bank->family_type = MSP432_NO_FAMILY;
    msp432_bank->device_type = MSP432_NO_TYPE;
    msp432_bank->sector_length = 0x1000;
    msp432_bank->probed_main = false;
    msp432_bank->probed_info = false;
    msp432_bank->unlock_bsl = false;
    msp432_bank->working_area = NULL;
 
    /* Finish up initial settings here */
    bank->driver_priv = msp432_bank;
    bank->base = FLASH_BASE;
 
    return ERROR_OK;
}
 
static int msp432_erase(struct flash_bank *bank, unsigned int first,
        unsigned int last)
{
    struct target *target = bank->target;
    struct msp432_bank *msp432_bank = bank->driver_priv;
    struct msp432_algo_params algo_params;
 
    bool is_main = bank->base == FLASH_BASE;
    bool is_info = bank->base == P4_FLASH_INFO_BASE;
 
    int retval;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    /* Do a mass erase if user requested all sectors of main flash */
    if (is_main && (first == 0) && (last == (bank->num_sectors - 1))) {
        /* Request mass erase of main flash */
        return msp432_mass_erase(bank, false);
    }
 
    retval = msp432_init(bank);
    if (retval != ERROR_OK)
        return retval;
 
    /* Initialize algorithm parameters to default values */
    msp432_init_params(&algo_params);
 
    /* Adjust params if this is the info bank */
    if (is_info) {
        buf_set_u32(algo_params.erase_param, 0, 32, FLASH_ERASE_INFO);
        /* And flag if BSL is unlocked */
        if (msp432_bank->unlock_bsl)
            buf_set_u32(algo_params.unlock_bsl, 0, 32, FLASH_UNLOCK_BSL);
    }
 
    /* Erase requested sectors one by one */
    for (unsigned int i = first; i <= last; i++) {
 
        /* Skip TVL (read-only) sector of the info bank */
        if (is_info && 1 == i)
            continue;
 
        /* Skip BSL sectors of info bank if locked */
        if (is_info && (2 == i || 3 == i) &&
            !msp432_bank->unlock_bsl)
            continue;
 
        /* Convert sector number to starting address of sector */
        buf_set_u32(algo_params.address, 0, 32, bank->base +
            (i * msp432_bank->sector_length));
 
        /* Issue the sector erase command to the flash helper algorithm */
        retval = msp432_exec_cmd(target, &algo_params, FLASH_SECTOR_ERASE);
        if (retval != ERROR_OK) {
            (void)msp432_quit(bank);
            return retval;
        }
 
        retval = msp432_wait_return_code(target);
        if (retval != ERROR_OK) {
            (void)msp432_quit(bank);
            return retval;
        }
    }
 
    retval = msp432_quit(bank);
    if (retval != ERROR_OK)
        return retval;
 
    return retval;
}
 
static int msp432_write(struct flash_bank *bank, const uint8_t *buffer,
    uint32_t offset, uint32_t count)
{
    struct target *target = bank->target;
    struct msp432_bank *msp432_bank = bank->driver_priv;
    struct msp432_algo_params algo_params;
    uint32_t size;
    uint32_t data_ready = BUFFER_DATA_READY;
 
    bool is_info = bank->base == P4_FLASH_INFO_BASE;
 
    int retval;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    /*
     * Block attempts to write to read-only sectors of flash
     * The TVL region in sector 1 of the info flash is always read-only
     * The BSL region in sectors 2 and 3 of the info flash may be unlocked
     * The helper algorithm will hang on attempts to write to TVL
     */
    if (is_info) {
        /* Set read-only start to TVL sector */
        uint32_t start = 0x1000;
        /* Set read-only end after BSL region if locked */
        uint32_t end = (msp432_bank->unlock_bsl) ? 0x2000 : 0x4000;
        /* Check if request includes anything in read-only sectors */
        if ((offset + count - 1) < start || offset >= end) {
            /* The request includes no bytes in read-only sectors */
            /* Fall out and process the request normally */
        } else {
            /* Send a request for anything before read-only sectors */
            if (offset < start) {
                uint32_t start_count = MIN(start - offset, count);
                retval = msp432_write(bank, buffer, offset, start_count);
                if (retval != ERROR_OK)
                    return retval;
            }
            /* Send a request for anything after read-only sectors */
            if ((offset + count - 1) >= end) {
                uint32_t skip = end - offset;
                count -= skip;
                offset += skip;
                buffer += skip;
                return msp432_write(bank, buffer, offset, count);
            } else {
                /* Request is entirely in read-only sectors */
                return ERROR_OK;
            }
        }
    }
 
    retval = msp432_init(bank);
    if (retval != ERROR_OK)
        return retval;
 
    /* Initialize algorithm parameters to default values */
    msp432_init_params(&algo_params);
 
    /* Set up parameters for requested flash write operation */
    buf_set_u32(algo_params.address, 0, 32, bank->base + offset);
    buf_set_u32(algo_params.length, 0, 32, count);
 
    /* Check if this is the info bank */
    if (is_info) {
        /* And flag if BSL is unlocked */
        if (msp432_bank->unlock_bsl)
            buf_set_u32(algo_params.unlock_bsl, 0, 32, FLASH_UNLOCK_BSL);
    }
 
    /* Set up flash helper algorithm to continuous flash mode */
    retval = msp432_exec_cmd(target, &algo_params, FLASH_CONTINUOUS);
    if (retval != ERROR_OK) {
        (void)msp432_quit(bank);
        return retval;
    }
 
    /* Write requested data, one buffer at a time */
    while (count > 0) {
 
        if (count > ALGO_BUFFER_SIZE)
            size = ALGO_BUFFER_SIZE;
        else
            size = count;
 
        /* Put next block of data to flash into buffer */
        retval = target_write_buffer(target, ALGO_BUFFER1_ADDR, size, buffer);
        if (retval != ERROR_OK) {
            LOG_ERROR("Unable to write data to target memory");
            (void)msp432_quit(bank);
            return ERROR_FLASH_OPERATION_FAILED;
        }
 
        /* Signal the flash helper algorithm that data is ready to flash */
        retval = target_write_u32(target, ALGO_BUFFER1_STATUS_ADDR,
                    data_ready);
        if (retval != ERROR_OK) {
            (void)msp432_quit(bank);
            return ERROR_FLASH_OPERATION_FAILED;
        }
 
        retval = msp432_wait_inactive(target, 1);
        if (retval != ERROR_OK) {
            (void)msp432_quit(bank);
            return retval;
        }
 
        count -= size;
        buffer += size;
 
        keep_alive();
    }
 
    /* Confirm that the flash helper algorithm is finished */
    retval = msp432_wait_return_code(target);
    if (retval != ERROR_OK) {
        (void)msp432_quit(bank);
        return retval;
    }
 
    retval = msp432_quit(bank);
    if (retval != ERROR_OK)
        return retval;
 
    return retval;
}
 
static int msp432_probe(struct flash_bank *bank)
{
    struct target *target = bank->target;
    struct msp432_bank *msp432_bank = bank->driver_priv;
 
    uint32_t device_id;
    uint32_t hardware_rev;
 
    uint32_t sector_length;
    uint32_t size;
    unsigned int num_sectors;
 
    bool is_main = bank->base == FLASH_BASE;
    bool is_info = bank->base == P4_FLASH_INFO_BASE;
 
    int retval;
 
    /* Check if this bank has already been successfully probed */
    if (is_main && msp432_bank->probed_main)
        return ERROR_OK;
    if (is_info && msp432_bank->probed_info)
        return ERROR_OK;
 
    /* Read the flash size register to determine this is a P4 or not */
    /* MSP432P4s will return the size of flash.  MSP432E4s will return zero */
    retval = target_read_u32(target, P4_FLASH_MAIN_SIZE_REG, &size);
    if (retval != ERROR_OK)
        return retval;
 
    if (size == 0) {
        /* This is likely an MSP432E4 */
        msp432_bank->family_type = MSP432E4;
 
        retval = target_read_u32(target, E4_DID0_REG, &device_id);
        if (retval != ERROR_OK)
            return retval;
 
        msp432_bank->device_id = device_id;
 
        retval = target_read_u32(target, E4_DID1_REG, &hardware_rev);
        if (retval != ERROR_OK)
            return retval;
 
        msp432_bank->hardware_rev = hardware_rev;
    } else {
        /* This is likely an MSP432P4 */
        msp432_bank->family_type = MSP432P4;
 
        retval = target_read_u32(target, P4_DEVICE_ID_REG, &device_id);
        if (retval != ERROR_OK)
            return retval;
 
        msp432_bank->device_id = device_id & 0xFFFF;
 
        retval = target_read_u32(target, P4_HARDWARE_REV_REG, &hardware_rev);
        if (retval != ERROR_OK)
            return retval;
 
        msp432_bank->hardware_rev = hardware_rev & 0xFF;
    }
 
    msp432_bank->device_type = msp432_device_type(msp432_bank->family_type,
        msp432_bank->device_id, msp432_bank->hardware_rev);
 
    if (msp432_bank->family_type == MSP432P4) {
        /* Set up MSP432P4 specific flash parameters */
        if (is_main) {
            retval = target_read_u32(target, P4_FLASH_MAIN_SIZE_REG, &size);
            if (retval != ERROR_OK)
                return retval;
 
            sector_length = P4_SECTOR_LENGTH;
            num_sectors = size / sector_length;
        } else if (is_info) {
            if (msp432_bank->device_type == MSP432P411X ||
                msp432_bank->device_type == MSP432P411X_GUESS) {
                /* MSP432P411x has an info size register, use that for size */
                retval = target_read_u32(target, P4_FLASH_INFO_SIZE_REG, &size);
                if (retval != ERROR_OK)
                    return retval;
            } else {
                /* All other MSP432P401x devices have fixed info region size */
                size = 0x4000; /* 16 KB info region */
            }
            sector_length = P4_SECTOR_LENGTH;
            num_sectors = size / sector_length;
        } else {
            /* Invalid bank somehow */
            return ERROR_FAIL;
        }
    } else {
        /* Set up MSP432E4 specific flash parameters */
        if (is_main) {
            size = E4_FLASH_SIZE;
            sector_length = E4_SECTOR_LENGTH;
            num_sectors = size / sector_length;
        } else {
            /* Invalid bank somehow */
            return ERROR_FAIL;
        }
    }
 
    free(bank->sectors);
    bank->sectors = NULL;
 
    if (num_sectors > 0) {
        bank->sectors = malloc(sizeof(struct flash_sector) * num_sectors);
        if (!bank->sectors)
            return ERROR_FAIL;
    }
 
    bank->size = size;
    bank->write_start_alignment = 0;
    bank->write_end_alignment = 0;
    bank->num_sectors = num_sectors;
    msp432_bank->sector_length = sector_length;
 
    for (unsigned int i = 0; i < num_sectors; i++) {
        bank->sectors[i].offset = i * sector_length;
        bank->sectors[i].size = sector_length;
        bank->sectors[i].is_erased = -1;
        bank->sectors[i].is_protected = 0;
    }
 
    /* We've successfully determined the stats on this flash bank */
    if (is_main)
        msp432_bank->probed_main = true;
    if (is_info)
        msp432_bank->probed_info = true;
 
    if (is_main && MSP432P4 == msp432_bank->family_type) {
        /* Create the info flash bank needed by MSP432P4 variants */
        struct flash_bank *info = calloc(1, sizeof(struct flash_bank));
        if (!info)
            return ERROR_FAIL;
 
        /* Create a name for the info bank, append "_1" to main name */
        char *name = malloc(strlen(bank->name) + 3);
        strcpy(name, bank->name);
        strcat(name, "_1");
 
        /* Initialize info bank */
        info->name = name;
        info->target = bank->target;
        info->driver = bank->driver;
        info->driver_priv = msp432_bank;
        info->base = P4_FLASH_INFO_BASE;
 
        flash_bank_add(info);
    }
 
    /* If we fall through to here, then all went well */
 
    return ERROR_OK;
}
 
static int msp432_auto_probe(struct flash_bank *bank)
{
    struct msp432_bank *msp432_bank = bank->driver_priv;
 
    bool is_main = bank->base == FLASH_BASE;
    bool is_info = bank->base == P4_FLASH_INFO_BASE;
 
    int retval = ERROR_OK;
 
    if (is_main)
        if (!msp432_bank->probed_main)
            retval = msp432_probe(bank);
    if (is_info)
        if (!msp432_bank->probed_info)
            retval = msp432_probe(bank);
 
    return retval;
}
 
static int msp432_info(struct flash_bank *bank, struct command_invocation *cmd)
{
    struct msp432_bank *msp432_bank = bank->driver_priv;
 
    switch (msp432_bank->device_type) {
    case MSP432P401X_DEPR:
        if (msp432_bank->device_id == 0xFFFF) {
            /* Very early pre-production silicon currently deprecated */
            command_print_sameline(cmd, "MSP432P401x pre-production device (deprecated silicon)\n"
                SUPPORT_MESSAGE);
        } else {
            /* Revision A or B silicon, also deprecated */
            command_print_sameline(cmd, "MSP432P401x Device Rev %c (deprecated silicon)\n"
                SUPPORT_MESSAGE, (char)msp432_bank->hardware_rev);
        }
        break;
    case MSP432P401X:
        command_print_sameline(cmd, "MSP432P401x Device Rev %c\n",
            (char)msp432_bank->hardware_rev);
        break;
    case MSP432P411X:
        command_print_sameline(cmd, "MSP432P411x Device Rev %c\n",
            (char)msp432_bank->hardware_rev);
        break;
    case MSP432E401Y:
        command_print_sameline(cmd, "MSP432E401Y Device\n");
        break;
    case MSP432E411Y:
        command_print_sameline(cmd, "MSP432E411Y Device\n");
        break;
    case MSP432E4X_GUESS:
        command_print_sameline(cmd,
            "Unrecognized MSP432E4 DID0 and DID1 IDs (%08" PRIX32 ", %08" PRIX32 ")",
            msp432_bank->device_id, msp432_bank->hardware_rev);
        break;
    case MSP432P401X_GUESS:
    case MSP432P411X_GUESS:
    default:
        command_print_sameline(cmd,
            "Unrecognized MSP432P4 Device ID and Hardware Rev (%04" PRIX32 ", %02" PRIX32 ")",
            msp432_bank->device_id, msp432_bank->hardware_rev);
        break;
    }
 
    return ERROR_OK;
}
 
static int msp432_protect_check(struct flash_bank *bank)
{
    /* Added to suppress warning, not needed for MSP432 flash */
    return ERROR_OK;
}
 
static void msp432_flash_free_driver_priv(struct flash_bank *bank)
{
    bool is_main = bank->base == FLASH_BASE;
 
    /* A single private struct is shared between main and info banks */
    /* Only free it on the call for main bank */
    if (is_main)
        free(bank->driver_priv);
 
    /* Forget about the private struct on both main and info banks */
    bank->driver_priv = NULL;
}
 
static const struct command_registration msp432_exec_command_handlers[] = {
    {
        .name = "mass_erase",
        .handler = msp432_mass_erase_command,
        .mode = COMMAND_EXEC,
        .help = "Erase entire flash memory on device.",
        .usage = "bank_id ['main' | 'all']",
    },
    {
        .name = "bsl",
        .handler = msp432_bsl_command,
        .mode = COMMAND_EXEC,
        .help = "Allow BSL to be erased or written by flash commands.",
        .usage = "bank_id ['unlock' | 'lock']",
    },
    COMMAND_REGISTRATION_DONE
};
 
static const struct command_registration msp432_command_handlers[] = {
    {
        .name = "msp432",
        .mode = COMMAND_EXEC,
        .help = "MSP432 flash command group",
        .usage = "",
        .chain = msp432_exec_command_handlers,
    },
    COMMAND_REGISTRATION_DONE
};
 
const struct flash_driver msp432_flash = {
    .name = "msp432",
    .commands = msp432_command_handlers,
    .flash_bank_command = msp432_flash_bank_command,
    .erase = msp432_erase,
    .write = msp432_write,
    .read = default_flash_read,
    .probe = msp432_probe,
    .auto_probe = msp432_auto_probe,
    .erase_check = default_flash_blank_check,
    .protect_check = msp432_protect_check,
    .info = msp432_info,
    .free_driver_priv = msp432_flash_free_driver_priv,
};