kinetis_ke.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *   Copyright (C) 2015 by Ivan Meleca                                     *
 *   ivan@artekit.eu                                                       *
 *                                                                         *
 *   Modified from kinetis.c                                               *
 *                                                                         *
 *   Copyright (C) 2011 by Mathias Kuester                                 *
 *   kesmtp@freenet.de                                                     *
 *                                                                         *
 *   Copyright (C) 2011 sleep(5) ltd                                       *
 *   tomas@sleepfive.com                                                   *
 *                                                                         *
 *   Copyright (C) 2012 by Christopher D. Kilgour                          *
 *   techie at whiterocker.com                                             *
 *                                                                         *
 *   Copyright (C) 2013 Nemui Trinomius                                    *
 *   nemuisan_kawausogasuki@live.jp                                        *
 *                                                                         *
 *   Copyright (C) 2015 Tomas Vanek                                        *
 *   vanekt@fbl.cz                                                         *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "jtag/interface.h"
#include "imp.h"
#include <helper/binarybuffer.h>
#include <target/algorithm.h>
#include <target/arm_adi_v5.h>
#include <target/armv7m.h>
#include <target/cortex_m.h>
 
/* Addresses */
#define SIM_SRSID                   0x40048000
#define ICS_C1                      0x40064000
#define ICS_C2                      0x40064001
#define ICS_C3                      0x40064002
#define ICS_C4                      0x40064003
#define ICS_S                       0x40064004
#define SIM_BUSDIV                  0x40048018
#define SIM_CLKDIV_KE06             0x40048024
#define SIM_CLKDIV_KE04_44_64_80    0x40048024
#define SIM_CLKDIV_KE04_16_20_24    0x4004801C
#define WDOG_CS1                    0x40052000
 
#define ICS_C2_BDIV_MASK            0xE0
#define ICS_C2_BDIV_SHIFT           5
#define ICS_C2_BDIV(x)              (((uint8_t)(((uint8_t)(x))<<ICS_C2_BDIV_SHIFT))&ICS_C2_BDIV_MASK)
#define ICS_S_LOCK_MASK             0x40
#define ICS_C4_SCFTRIM_MASK         0x1
#define SIM_CLKDIV_OUTDIV2_MASK     0x1000000
#define FTMRX_FCLKDIV_FDIV_MASK     0x3F
#define FTMRX_FCLKDIV_FDIV_SHIFT    0
#define FTMRX_FCLKDIV_FDIV(x)       (((uint8_t)(((uint8_t)(x))<<FTMRX_FCLKDIV_FDIV_SHIFT))&FTMRX_FCLKDIV_FDIV_MASK)
#define FTMRX_FCLKDIV_FDIVLCK_MASK  0x40
#define FTMRX_FCLKDIV_FDIVLCK_SHIFT 6
#define FTMRX_FCLKDIV_FDIVLD_MASK   0x80
#define FTMRX_FCLKDIV_FDIVLD_SHIFT  7
#define FTMRX_FSTAT_CCIF_MASK       0x80
#define FTMRX_FSTAT_MGSTAT0_MASK    0x01
#define FTMRX_FSTAT_MGSTAT1_MASK    0x02
 
/* Commands */
#define FTMRX_CMD_ALLERASED         0x01
#define FTMRX_CMD_BLOCKERASED       0x02
#define FTMRX_CMD_SECTIONERASED     0x03
#define FTMRX_CMD_READONCE          0x04
#define FTMRX_CMD_PROGFLASH         0x06
#define FTMRX_CMD_PROGONCE          0x07
#define FTMRX_CMD_ERASEALL          0x08
#define FTMRX_CMD_ERASEBLOCK        0x09
#define FTMRX_CMD_ERASESECTOR       0x0A
#define FTMRX_CMD_UNSECURE          0x0B
#define FTMRX_CMD_VERIFYACCESS      0x0C
#define FTMRX_CMD_SETMARGINLVL      0x0D
#define FTMRX_CMD_SETFACTORYLVL     0x0E
#define FTMRX_CMD_CONFIGNVM         0x0F
 
/* Error codes */
#define FTMRX_ERROR_ACCERR          0x20
#define FTMRX_ERROR_FPVIOL          0x10
 
#define KINETIS_KE_SRSID_FAMID(x)       ((x >> 28) & 0x0F)
#define KINETIS_KE_SRSID_SUBFAMID(x)    ((x >> 24) & 0x0F)
#define KINETIS_KE_SRSID_PINCOUNT(x)    ((x >> 16) & 0x0F)
 
#define KINETIS_KE_SRSID_KEX2   0x02
#define KINETIS_KE_SRSID_KEX4   0x04
#define KINETIS_KE_SRSID_KEX6   0x06
 
struct kinetis_ke_flash_bank {
    uint32_t sector_size;
    uint32_t protection_size;
 
    uint32_t sim_srsid;
    uint32_t ftmrx_fclkdiv_addr;
    uint32_t ftmrx_fccobix_addr;
    uint32_t ftmrx_fstat_addr;
    uint32_t ftmrx_fprot_addr;
    uint32_t ftmrx_fccobhi_addr;
    uint32_t ftmrx_fccoblo_addr;
};
 
#define MDM_REG_STAT        0x00
#define MDM_REG_CTRL        0x04
#define MDM_REG_ID          0xfc
 
#define MDM_STAT_FMEACK     (1<<0)
#define MDM_STAT_FREADY     (1<<1)
#define MDM_STAT_SYSSEC     (1<<2)
#define MDM_STAT_SYSRES     (1<<3)
#define MDM_STAT_FMEEN      (1<<5)
#define MDM_STAT_BACKDOOREN (1<<6)
#define MDM_STAT_LPEN       (1<<7)
#define MDM_STAT_VLPEN      (1<<8)
#define MDM_STAT_LLSMODEXIT (1<<9)
#define MDM_STAT_VLLSXMODEXIT   (1<<10)
#define MDM_STAT_CORE_HALTED    (1<<16)
#define MDM_STAT_CORE_SLEEPDEEP (1<<17)
#define MDM_STAT_CORESLEEPING   (1<<18)
 
#define MEM_CTRL_FMEIP      (1<<0)
#define MEM_CTRL_DBG_DIS    (1<<1)
#define MEM_CTRL_DBG_REQ    (1<<2)
#define MEM_CTRL_SYS_RES_REQ    (1<<3)
#define MEM_CTRL_CORE_HOLD_RES  (1<<4)
#define MEM_CTRL_VLLSX_DBG_REQ  (1<<5)
#define MEM_CTRL_VLLSX_DBG_ACK  (1<<6)
#define MEM_CTRL_VLLSX_STAT_ACK (1<<7)
 
#define MDM_ACCESS_TIMEOUT  3000 /* iterations */
 
static int kinetis_ke_mdm_write_register(struct adiv5_dap *dap, unsigned int reg, uint32_t value)
{
    LOG_DEBUG("MDM_REG[0x%02x] <- %08" PRIX32, reg, value);
 
    struct adiv5_ap *ap = dap_get_ap(dap, 1);
    if (!ap) {
        LOG_DEBUG("MDM: failed to get AP");
        return ERROR_FAIL;
    }
 
    int retval = dap_queue_ap_write(ap, reg, value);
    if (retval != ERROR_OK) {
        LOG_DEBUG("MDM: failed to queue a write request");
        dap_put_ap(ap);
        return retval;
    }
 
    retval = dap_run(dap);
    dap_put_ap(ap);
    if (retval != ERROR_OK) {
        LOG_DEBUG("MDM: dap_run failed");
        return retval;
    }
 
    return ERROR_OK;
}
 
static int kinetis_ke_mdm_read_register(struct adiv5_dap *dap, unsigned int reg, uint32_t *result)
{
    struct adiv5_ap *ap = dap_get_ap(dap, 1);
    if (!ap) {
        LOG_DEBUG("MDM: failed to get AP");
        return ERROR_FAIL;
    }
 
    int retval = dap_queue_ap_read(ap, reg, result);
    if (retval != ERROR_OK) {
        LOG_DEBUG("MDM: failed to queue a read request");
        dap_put_ap(ap);
        return retval;
    }
 
    retval = dap_run(dap);
    dap_put_ap(ap);
    if (retval != ERROR_OK) {
        LOG_DEBUG("MDM: dap_run failed");
        return retval;
    }
 
    LOG_DEBUG("MDM_REG[0x%02x]: %08" PRIX32, reg, *result);
    return ERROR_OK;
}
 
static int kinetis_ke_mdm_poll_register(struct adiv5_dap *dap, unsigned int reg, uint32_t mask, uint32_t value)
{
    uint32_t val;
    int retval;
    int timeout = MDM_ACCESS_TIMEOUT;
 
    do {
        retval = kinetis_ke_mdm_read_register(dap, reg, &val);
        if (retval != ERROR_OK || (val & mask) == value)
            return retval;
 
        alive_sleep(1);
    } while (timeout--);
 
    LOG_DEBUG("MDM: polling timed out");
    return ERROR_FAIL;
}
 
static int kinetis_ke_prepare_flash(struct flash_bank *bank)
{
    struct target *target = bank->target;
    struct kinetis_ke_flash_bank *kinfo = bank->driver_priv;
    uint8_t c2, c3, c4, s = 0;
    uint16_t trim_value = 0;
    uint16_t timeout = 0;
    uint32_t bus_clock = 0;
    uint32_t bus_reg_val = 0;
    uint32_t bus_reg_addr = 0;
    uint32_t flash_clk_div;
    uint8_t fclkdiv;
    int result;
 
    /*
     * The RM states that the flash clock has to be set to 1MHz for writing and
     * erasing operations (otherwise it can damage the flash).
     * This function configures the entire clock tree to make sure we
     * run at the specified clock. We'll set FEI mode running from the ~32KHz
     * internal clock. So we need to:
     * - Trim internal clock.
     * - Configure the divider for ICSOUTCLK (ICS module).
     * - Configure the divider to get a bus clock (SIM module).
     * - Configure the flash clock that depends on the bus clock.
     *
     * For MKE02_40 and MKE02_20 we set ICSOUTCLK = 20MHz and bus clock = 20MHz.
     * For MKE04 and MKE06 we run at ICSOUTCLK = 48MHz and bus clock = 24MHz.
     */
 
    /*
     * Trim internal clock
     */
    switch (KINETIS_KE_SRSID_SUBFAMID(kinfo->sim_srsid)) {
 
        case KINETIS_KE_SRSID_KEX2:
            /* Both KE02_20 and KE02_40 should get the same trim value */
            trim_value = 0x4C;
            break;
 
        case KINETIS_KE_SRSID_KEX4:
            trim_value = 0x54;
            break;
 
        case KINETIS_KE_SRSID_KEX6:
            trim_value = 0x58;
            break;
    }
 
    result = target_read_u8(target, ICS_C4, &c4);
    if (result != ERROR_OK)
        return result;
 
    c3 = trim_value;
    c4 = (c4 & ~(ICS_C4_SCFTRIM_MASK)) | ((trim_value >> 8) & 0x01);
 
    result = target_write_u8(target, ICS_C3, c3);
    if (result != ERROR_OK)
        return result;
 
    result = target_write_u8(target, ICS_C4, c4);
    if (result != ERROR_OK)
        return result;
 
    result = target_read_u8(target, ICS_S, &s);
    if (result != ERROR_OK)
        return result;
 
    /* Wait */
    while (!(s & ICS_S_LOCK_MASK)) {
 
        if (timeout <= 1000) {
            timeout++;
            alive_sleep(1);
        } else {
            return ERROR_FAIL;
        }
 
        result = target_read_u8(target, ICS_S, &s);
        if (result != ERROR_OK)
            return result;
    }
 
    /* ... trim done ... */
 
    /*
     * Configure SIM (bus clock)
     */
    switch (KINETIS_KE_SRSID_SUBFAMID(kinfo->sim_srsid)) {
 
        /* KE02 sub-family operates on SIM_BUSDIV */
        case KINETIS_KE_SRSID_KEX2:
            bus_reg_val = 0;
            bus_reg_addr = SIM_BUSDIV;
            bus_clock = 20000000;
            break;
 
        /* KE04 and KE06 sub-family operates on SIM_CLKDIV
         * Clocks are divided by:
         * DIV1 = core clock = 48MHz
         * DIV2 = bus clock = 24Mhz
         * DIV3 = timer clocks
         * So we need to configure SIM_CLKDIV, DIV1 and DIV2 value
         */
        case KINETIS_KE_SRSID_KEX4:
            /* KE04 devices have the SIM_CLKDIV register at a different offset
             * depending on the pin count. */
            switch (KINETIS_KE_SRSID_PINCOUNT(kinfo->sim_srsid)) {
 
                /* 16, 20 and 24 pins */
                case 1:
                case 2:
                case 3:
                    bus_reg_addr = SIM_CLKDIV_KE04_16_20_24;
                    break;
 
                /* 44, 64 and 80 pins */
                case 5:
                case 7:
                case 8:
                    bus_reg_addr = SIM_CLKDIV_KE04_44_64_80;
                    break;
 
                default:
                    LOG_ERROR("KE04 - Unknown pin count");
                    return ERROR_FAIL;
            }
 
            bus_reg_val = SIM_CLKDIV_OUTDIV2_MASK;
            bus_clock = 24000000;
            break;
 
        case KINETIS_KE_SRSID_KEX6:
            bus_reg_val = SIM_CLKDIV_OUTDIV2_MASK;
            bus_reg_addr = SIM_CLKDIV_KE06;
            bus_clock = 24000000;
            break;
    }
 
    result = target_write_u32(target, bus_reg_addr, bus_reg_val);
    if (result != ERROR_OK)
        return result;
 
    /*
     * Configure ICS to FEI (internal source)
     */
    result = target_read_u8(target, ICS_C2, &c2);
    if (result != ERROR_OK)
        return result;
 
    c2 &= ~ICS_C2_BDIV_MASK;
 
    switch (KINETIS_KE_SRSID_SUBFAMID(kinfo->sim_srsid)) {
 
        case KINETIS_KE_SRSID_KEX2:
            /* Note: since there are two KE02 types, the KE02_40 @ 40MHz and the
             * KE02_20 @ 20MHz, we divide here the ~40MHz ICSFLLCLK down to 20MHz,
             * for compatibility.
             */
            c2 |= ICS_C2_BDIV(1);
            break;
 
        case KINETIS_KE_SRSID_KEX4:
        case KINETIS_KE_SRSID_KEX6:
            /* For KE04 and KE06, the ICSFLLCLK can be 48MHz. */
            c2 |= ICS_C2_BDIV(0);
            break;
    }
 
    result = target_write_u8(target, ICS_C2, c2);
    if (result != ERROR_OK)
        return result;
 
    /* Internal clock as reference (IREFS = 1) */
    result = target_write_u8(target, ICS_C1, 4);
    if (result != ERROR_OK)
        return result;
 
    /* Wait for FLL to lock */
    result = target_read_u8(target, ICS_S, &s);
    if (result != ERROR_OK)
        return result;
 
    while (!(s & ICS_S_LOCK_MASK)) {
 
        if (timeout <= 1000) {
            timeout++;
            alive_sleep(1);
        } else {
            return ERROR_FLASH_OPERATION_FAILED;
        }
 
        result = target_read_u8(target, ICS_S, &s);
        if (result != ERROR_OK)
            return result;
    }
 
    /*
     * Configure flash clock to 1MHz.
     */
    flash_clk_div = bus_clock / 1000000L - 1;
 
    /* Check if the FCLKDIV register is locked */
    result = target_read_u8(target, kinfo->ftmrx_fclkdiv_addr, &fclkdiv);
    if (result != ERROR_OK)
        return result;
 
    if (!(fclkdiv & FTMRX_FCLKDIV_FDIVLCK_MASK)) {
        /* Unlocked. Check if the register was configured, and if so, if it has the right value */
        if ((fclkdiv & FTMRX_FCLKDIV_FDIVLD_MASK) &&
            ((fclkdiv & FTMRX_FCLKDIV_FDIV_MASK) != FTMRX_FCLKDIV_FDIV(flash_clk_div))) {
            LOG_WARNING("Flash clock was already set and contains an invalid value.");
            LOG_WARNING("Please reset the target.");
            return ERROR_FAIL;
        }
 
        /* Finally, configure the flash clock */
        fclkdiv = (fclkdiv & ~(FTMRX_FCLKDIV_FDIV_MASK)) | FTMRX_FCLKDIV_FDIV(flash_clk_div);
        result = target_write_u8(target, kinfo->ftmrx_fclkdiv_addr, fclkdiv);
        if (result != ERROR_OK)
            return result;
    } else {
        /* Locked. Check if the current value is correct. */
        if ((fclkdiv & FTMRX_FCLKDIV_FDIV_MASK) != FTMRX_FCLKDIV_FDIV(flash_clk_div)) {
            LOG_WARNING("Flash clock register is locked and contains an invalid value.");
            LOG_WARNING("Please reset the target.");
            return ERROR_FAIL;
        }
    }
 
    LOG_INFO("Flash clock ready");
    return ERROR_OK;
}
 
static int kinetis_ke_stop_watchdog(struct target *target)
{
    struct working_area *watchdog_algorithm;
    struct armv7m_algorithm armv7m_info;
    int retval;
    uint8_t cs1;
 
    static const uint8_t watchdog_code[] = {
#include "../../../contrib/loaders/flash/kinetis_ke/kinetis_ke_watchdog.inc"
    };
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    /* Check if the watchdog is enabled */
    retval = target_read_u8(target, WDOG_CS1, &cs1);
    if (retval != ERROR_OK)
        return retval;
 
    if (!(cs1 & 0x80)) {
        /* Already stopped */
        return ERROR_OK;
    }
 
    /* allocate working area with watchdog code */
    if (target_alloc_working_area(target, sizeof(watchdog_code), &watchdog_algorithm) != ERROR_OK) {
        LOG_WARNING("No working area available for watchdog algorithm");
        return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
    }
 
    retval = target_write_buffer(target, watchdog_algorithm->address,
            sizeof(watchdog_code), watchdog_code);
    if (retval != ERROR_OK)
        return retval;
 
    armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
    armv7m_info.core_mode = ARM_MODE_THREAD;
 
    retval = target_run_algorithm(target, 0, NULL, 0, NULL,
            watchdog_algorithm->address, 0, 100000, &armv7m_info);
    if (retval != ERROR_OK) {
        LOG_ERROR("Error executing Kinetis KE watchdog algorithm");
    } else {
        LOG_INFO("Watchdog stopped");
    }
 
    target_free_working_area(target, watchdog_algorithm);
 
    return retval;
}
 
COMMAND_HANDLER(kinetis_ke_disable_wdog_handler)
{
    struct target *target = get_current_target(CMD_CTX);
 
    if (CMD_ARGC > 0)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    return kinetis_ke_stop_watchdog(target);
}
 
COMMAND_HANDLER(kinetis_ke_mdm_mass_erase)
{
    struct target *target = get_current_target(CMD_CTX);
    struct cortex_m_common *cortex_m = target_to_cm(target);
    struct adiv5_dap *dap = cortex_m->armv7m.arm.dap;
 
    if (!dap) {
        LOG_ERROR("Cannot perform mass erase with a high-level adapter");
        return ERROR_FAIL;
    }
 
    int retval;
 
    /* According to chapter 18.3.7.2 of the KE02 reference manual */
 
    /* assert SRST */
    if (jtag_get_reset_config() & RESET_HAS_SRST)
        adapter_assert_reset();
 
    /*
     * 1. Reset the device by asserting RESET pin or DAP_CTRL[3]
     */
    retval = kinetis_ke_mdm_write_register(dap, MDM_REG_CTRL, MEM_CTRL_SYS_RES_REQ);
    if (retval != ERROR_OK)
        return retval;
 
    /*
     * ... Read the MDM-AP status register until the Flash Ready bit sets...
     */
    retval = kinetis_ke_mdm_poll_register(dap, MDM_REG_STAT,
                       MDM_STAT_FREADY | MDM_STAT_SYSRES,
                       MDM_STAT_FREADY);
    if (retval != ERROR_OK) {
        LOG_ERROR("MDM : flash ready timeout");
        return retval;
    }
 
    /*
     * 2. Set DAP_CTRL[0] bit to invoke debug mass erase via SWD
     * 3. Release reset by deasserting RESET pin or DAP_CTRL[3] bit via SWD.
     */
    retval = kinetis_ke_mdm_write_register(dap, MDM_REG_CTRL, MEM_CTRL_FMEIP);
    if (retval != ERROR_OK)
        return retval;
 
    /* As a sanity check make sure that device started mass erase procedure */
    retval = kinetis_ke_mdm_poll_register(dap, MDM_REG_STAT,
                       MDM_STAT_FMEACK, MDM_STAT_FMEACK);
    if (retval != ERROR_OK)
        return retval;
 
    /*
     * 4. Wait till DAP_CTRL[0] bit is cleared (after mass erase completes,
     * DAP_CTRL[0] bit is cleared automatically).
     */
    retval = kinetis_ke_mdm_poll_register(dap, MDM_REG_CTRL,
                       MEM_CTRL_FMEIP,
                       0);
    if (retval != ERROR_OK)
        return retval;
 
    if (jtag_get_reset_config() & RESET_HAS_SRST)
        adapter_deassert_reset();
 
    return ERROR_OK;
}
 
static const uint32_t kinetis_ke_known_mdm_ids[] = {
    0x001C0020, /* Kinetis-L/M/V/E/KE Series */
};
 
/*
 * This function implements the procedure to connect to
 * SWD/JTAG on Kinetis K and L series of devices as it is described in
 * AN4835 "Production Flash Programming Best Practices for Kinetis K-
 * and L-series MCUs" Section 4.1.1
 */
COMMAND_HANDLER(kinetis_ke_check_flash_security_status)
{
    struct target *target = get_current_target(CMD_CTX);
    struct cortex_m_common *cortex_m = target_to_cm(target);
    struct adiv5_dap *dap = cortex_m->armv7m.arm.dap;
 
    if (!dap) {
        LOG_WARNING("Cannot check flash security status with a high-level adapter");
        return ERROR_OK;
    }
 
    uint32_t val;
    int retval;
 
    /*
     * ... The MDM-AP ID register can be read to verify that the
     * connection is working correctly...
     */
    retval = kinetis_ke_mdm_read_register(dap, MDM_REG_ID, &val);
    if (retval != ERROR_OK) {
        LOG_ERROR("MDM: failed to read ID register");
        goto fail;
    }
 
    bool found = false;
    for (size_t i = 0; i < ARRAY_SIZE(kinetis_ke_known_mdm_ids); i++) {
        if (val == kinetis_ke_known_mdm_ids[i]) {
            found = true;
            break;
        }
    }
 
    if (!found)
        LOG_WARNING("MDM: unknown ID %08" PRIX32, val);
 
    /*
     * ... Read the MDM-AP status register until the Flash Ready bit sets...
     */
    retval = kinetis_ke_mdm_poll_register(dap, MDM_REG_STAT,
                       MDM_STAT_FREADY,
                       MDM_STAT_FREADY);
    if (retval != ERROR_OK) {
        LOG_ERROR("MDM: flash ready timeout");
        goto fail;
    }
 
    /*
     * ... Read the System Security bit to determine if security is enabled.
     * If System Security = 0, then proceed. If System Security = 1, then
     * communication with the internals of the processor, including the
     * flash, will not be possible without issuing a mass erase command or
     * unsecuring the part through other means (backdoor key unlock)...
     */
    retval = kinetis_ke_mdm_read_register(dap, MDM_REG_STAT, &val);
    if (retval != ERROR_OK) {
        LOG_ERROR("MDM: failed to read MDM_REG_STAT");
        goto fail;
    }
 
    if (val & MDM_STAT_SYSSEC) {
        jtag_poll_set_enabled(false);
 
        LOG_WARNING("*********** ATTENTION! ATTENTION! ATTENTION! ATTENTION! **********");
        LOG_WARNING("****                                                          ****");
        LOG_WARNING("**** Your Kinetis MCU is in secured state, which means that,  ****");
        LOG_WARNING("**** with exception for very basic communication, JTAG/SWD    ****");
        LOG_WARNING("**** interface will NOT work. In order to restore its         ****");
        LOG_WARNING("**** functionality please issue 'kinetis_ke mdm mass_erase'   ****");
        LOG_WARNING("**** command, power cycle the MCU and restart OpenOCD.        ****");
        LOG_WARNING("****                                                          ****");
        LOG_WARNING("*********** ATTENTION! ATTENTION! ATTENTION! ATTENTION! **********");
    } else {
        LOG_INFO("MDM: Chip is unsecured. Continuing.");
        jtag_poll_set_enabled(true);
    }
 
    return ERROR_OK;
 
fail:
    LOG_ERROR("MDM: Failed to check security status of the MCU. Cannot proceed further");
    jtag_poll_set_enabled(false);
    return retval;
}
 
FLASH_BANK_COMMAND_HANDLER(kinetis_ke_flash_bank_command)
{
    struct kinetis_ke_flash_bank *bank_info;
 
    if (CMD_ARGC < 6)
        return ERROR_COMMAND_SYNTAX_ERROR;
 
    LOG_INFO("add flash_bank kinetis_ke %s", bank->name);
 
    bank_info = malloc(sizeof(struct kinetis_ke_flash_bank));
 
    memset(bank_info, 0, sizeof(struct kinetis_ke_flash_bank));
 
    bank->driver_priv = bank_info;
 
    return ERROR_OK;
}
 
/* Kinetis Program-LongWord Microcodes */
static uint8_t kinetis_ke_flash_write_code[] = {
#include "../../../contrib/loaders/flash/kinetis_ke/kinetis_ke_flash.inc"
};
 
static int kinetis_ke_write_words(struct flash_bank *bank, const uint8_t *buffer,
                                uint32_t offset, uint32_t words)
{
    struct kinetis_ke_flash_bank *kinfo = bank->driver_priv;
    struct target *target = bank->target;
    uint32_t ram_buffer_size = 512 + 16;
    struct working_area *write_algorithm;
    struct working_area *source;
    uint32_t address = bank->base + offset;
    struct reg_param reg_params[4];
    struct armv7m_algorithm armv7m_info;
    int retval = ERROR_OK;
    uint32_t flash_code_size;
 
    LOG_INFO("Kinetis KE: FLASH Write ...");
 
    /* allocate working area with flash programming code */
    if (target_alloc_working_area(target, sizeof(kinetis_ke_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;
    }
 
    /* Patch the FTMRx registers addresses */
    flash_code_size = sizeof(kinetis_ke_flash_write_code);
    buf_set_u32(&kinetis_ke_flash_write_code[flash_code_size-16], 0, 32, kinfo->ftmrx_fstat_addr);
    buf_set_u32(&kinetis_ke_flash_write_code[flash_code_size-12], 0, 32, kinfo->ftmrx_fccobix_addr);
    buf_set_u32(&kinetis_ke_flash_write_code[flash_code_size-8], 0, 32, kinfo->ftmrx_fccobhi_addr);
    buf_set_u32(&kinetis_ke_flash_write_code[flash_code_size-4], 0, 32, kinfo->ftmrx_fccoblo_addr);
 
    retval = target_write_buffer(target, write_algorithm->address,
        sizeof(kinetis_ke_flash_write_code), kinetis_ke_flash_write_code);
    if (retval != ERROR_OK)
        return retval;
 
    /* memory buffer */
    if (target_alloc_working_area(target, ram_buffer_size, &source) != ERROR_OK) {
        /* free working area, write algorithm already allocated */
        target_free_working_area(target, write_algorithm);
 
        LOG_WARNING("No large enough working area available, can't do block memory writes");
        return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
    }
 
    armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
    armv7m_info.core_mode = ARM_MODE_THREAD;
 
    init_reg_param(&reg_params[0], "r0", 32, PARAM_IN_OUT);
    init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
    init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT);
    init_reg_param(&reg_params[3], "r3", 32, PARAM_OUT);
 
    buf_set_u32(reg_params[0].value, 0, 32, address);
    buf_set_u32(reg_params[1].value, 0, 32, words);
    buf_set_u32(reg_params[2].value, 0, 32, source->address);
    buf_set_u32(reg_params[3].value, 0, 32, source->address + source->size);
 
    retval = target_run_flash_async_algorithm(target, buffer, words, 4,
            0, NULL,
            4, reg_params,
            source->address, source->size,
            write_algorithm->address, 0,
            &armv7m_info);
 
    if (retval == ERROR_FLASH_OPERATION_FAILED) {
        if (buf_get_u32(reg_params[0].value, 0, 32) & FTMRX_ERROR_ACCERR)
            LOG_ERROR("flash access error");
 
        if (buf_get_u32(reg_params[0].value, 0, 32) & FTMRX_ERROR_FPVIOL)
            LOG_ERROR("flash protection violation");
    }
 
    target_free_working_area(target, source);
    target_free_working_area(target, write_algorithm);
 
    destroy_reg_param(&reg_params[0]);
    destroy_reg_param(&reg_params[1]);
    destroy_reg_param(&reg_params[2]);
    destroy_reg_param(&reg_params[3]);
 
    return retval;
}
 
static int kinetis_ke_protect(struct flash_bank *bank, int set,
        unsigned int first, unsigned int last)
{
    LOG_WARNING("kinetis_ke_protect not supported yet");
    /* FIXME: TODO */
 
    if (bank->target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    return ERROR_FLASH_BANK_INVALID;
}
 
static int kinetis_ke_protect_check(struct flash_bank *bank)
{
    struct kinetis_ke_flash_bank *kinfo = bank->driver_priv;
 
    if (bank->target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    int result;
    uint8_t fprot;
    uint8_t fpopen, fpldis, fphdis;
    uint8_t fphs, fpls;
    uint32_t lprot_size = 0, hprot_size = 0;
    uint32_t lprot_to = 0, hprot_from = 0;
 
    /* read protection register */
    result = target_read_u8(bank->target, kinfo->ftmrx_fprot_addr, &fprot);
 
    if (result != ERROR_OK)
        return result;
 
    fpopen = fprot & 0x80;
    fpldis = fprot & 0x04;
    fphdis = fprot & 0x20;
    fphs = (fprot >> 3) & 0x03;
    fpls = fprot & 0x03;
 
    /* Fully unprotected? */
    if (fpopen && fpldis && fphdis) {
        LOG_WARNING("No flash protection found.");
 
        for (unsigned int i = 0; i < bank->num_sectors; i++)
            bank->sectors[i].is_protected = 0;
 
        kinfo->protection_size = 0;
    } else {
        LOG_WARNING("Flash protected. FPOPEN=%i FPLDIS=%i FPHDIS=%i FPLS=%i FPHS=%i",
                    fpopen ? 1 : 0, fpldis ? 1 : 0, fphdis ? 1 : 0, fpls, fphs);
 
        /* Retrieve which region is protected and how much */
        if (fpopen) {
            if (fpldis == 0)
                lprot_size = (kinfo->sector_size * 4) << fpls;
 
            if (fphdis == 0)
                hprot_size = (kinfo->sector_size * 2) << fphs;
        } else {
            if (fpldis == 1)
                lprot_size = (kinfo->sector_size * 4) << fpls;
 
            if (fphdis == 1)
                hprot_size = (kinfo->sector_size * 2) << fphs;
        }
 
        kinfo->protection_size = lprot_size + hprot_size;
 
        /* lprot_to indicates up to where the lower region is protected */
        lprot_to = lprot_size / kinfo->sector_size;
 
        /* hprot_from indicates from where the upper region is protected */
        hprot_from = (0x8000 - hprot_size) / kinfo->sector_size;
 
        for (unsigned int i = 0; i < bank->num_sectors; i++) {
 
            /* Check if the sector is in the lower region */
            if (bank->sectors[i].offset < 0x4000) {
                /* Compare the sector start address against lprot_to */
                if (lprot_to && (i < lprot_to))
                    bank->sectors[i].is_protected = 1;
                else
                    bank->sectors[i].is_protected = 0;
 
            /* Check if the sector is between the lower and upper region
             * OR after the upper region */
            } else if (bank->sectors[i].offset < 0x6000 || bank->sectors[i].offset >= 0x8000) {
                /* If fpopen is 1 then these regions are protected */
                if (fpopen)
                    bank->sectors[i].is_protected = 0;
                else
                    bank->sectors[i].is_protected = 1;
 
            /* Check if the sector is in the upper region */
            } else if (bank->sectors[i].offset < 0x8000) {
                if (hprot_from && (i > hprot_from))
                    bank->sectors[i].is_protected = 1;
                else
                    bank->sectors[i].is_protected = 0;
            }
        }
    }
 
    return ERROR_OK;
}
 
static int kinetis_ke_ftmrx_command(struct flash_bank *bank, uint8_t count,
                                    uint8_t *FCCOBIX, uint8_t *FCCOBHI, uint8_t *FCCOBLO, uint8_t *fstat)
{
    uint8_t i;
    int result;
    struct target *target = bank->target;
    struct kinetis_ke_flash_bank *kinfo = bank->driver_priv;
    uint32_t timeout = 0;
 
    /* Clear error flags */
    result = target_write_u8(target, kinfo->ftmrx_fstat_addr, 0x30);
    if (result != ERROR_OK)
        return result;
 
    for (i = 0; i < count; i++) {
        /* Write index */
        result = target_write_u8(target, kinfo->ftmrx_fccobix_addr, FCCOBIX[i]);
        if (result != ERROR_OK)
            return result;
 
        /* Write high part */
        result = target_write_u8(target, kinfo->ftmrx_fccobhi_addr, FCCOBHI[i]);
        if (result != ERROR_OK)
            return result;
 
        /* Write low part (that is not always required) */
        if (FCCOBLO) {
            result = target_write_u8(target, kinfo->ftmrx_fccoblo_addr, FCCOBLO[i]);
            if (result != ERROR_OK)
                return result;
        }
    }
 
    /* Launch the command */
    result = target_write_u8(target, kinfo->ftmrx_fstat_addr, 0x80);
    if (result != ERROR_OK)
        return result;
 
    /* Wait for it to finish */
    result = target_read_u8(target, kinfo->ftmrx_fstat_addr, fstat);
    if (result != ERROR_OK)
        return result;
 
    while (!(*fstat & FTMRX_FSTAT_CCIF_MASK)) {
        if (timeout <= 1000) {
            timeout++;
            alive_sleep(1);
        } else {
            return ERROR_FLASH_OPERATION_FAILED;
        }
 
        result = target_read_u8(target, kinfo->ftmrx_fstat_addr, fstat);
        if (result != ERROR_OK)
            return result;
    }
 
    return ERROR_OK;
}
 
static int kinetis_ke_erase(struct flash_bank *bank, unsigned int first,
        unsigned int last)
{
    int result;
    uint8_t FCCOBIX[2], FCCOBHI[2], FCCOBLO[2], fstat;
    bool fcf_erased = false;
 
    if (bank->target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    if ((first > bank->num_sectors) || (last > bank->num_sectors))
        return ERROR_FLASH_OPERATION_FAILED;
 
    result = kinetis_ke_prepare_flash(bank);
    if (result != ERROR_OK)
        return result;
 
    for (unsigned int i = first; i <= last; i++) {
        FCCOBIX[0] = 0;
        FCCOBHI[0] = FTMRX_CMD_ERASESECTOR;
        FCCOBLO[0] = (bank->base + bank->sectors[i].offset) >> 16;
 
        FCCOBIX[1] = 1;
        FCCOBHI[1] = (bank->base + bank->sectors[i].offset) >> 8;
        FCCOBLO[1] = (bank->base + bank->sectors[i].offset);
 
        result = kinetis_ke_ftmrx_command(bank, 2, FCCOBIX, FCCOBHI, FCCOBLO, &fstat);
 
        if (result != ERROR_OK) {
            LOG_WARNING("erase sector %u failed", i);
            return ERROR_FLASH_OPERATION_FAILED;
        }
 
        if (i == 2)
            fcf_erased = true;
    }
 
    if (fcf_erased) {
        LOG_WARNING
            ("flash configuration field erased, please reset the device");
    }
 
    return ERROR_OK;
}
 
static int kinetis_ke_write(struct flash_bank *bank, const uint8_t *buffer,
             uint32_t offset, uint32_t count)
{
    int result;
    uint8_t *new_buffer = NULL;
    uint32_t words = count / 4;
 
    if (bank->target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    if (offset > bank->size)
        return ERROR_FLASH_BANK_INVALID;
 
    if (offset & 0x3) {
        LOG_WARNING("offset 0x%" PRIx32 " breaks the required alignment", offset);
        return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
    }
 
    result = kinetis_ke_stop_watchdog(bank->target);
    if (result != ERROR_OK)
            return result;
 
    result = kinetis_ke_prepare_flash(bank);
    if (result != ERROR_OK)
        return result;
 
    if (count & 0x3) {
        uint32_t old_count = count;
        count = (old_count | 3) + 1;
        new_buffer = malloc(count);
        if (!new_buffer) {
            LOG_ERROR("odd number of bytes to write and no memory "
                "for padding buffer");
            return ERROR_FAIL;
        }
 
        LOG_INFO("odd number of bytes to write (%" PRIu32 "), extending to %" PRIu32 " "
            "and padding with 0xff", old_count, count);
 
        memset(new_buffer, 0xff, count);
        buffer = memcpy(new_buffer, buffer, old_count);
        words++;
    }
 
    result = kinetis_ke_write_words(bank, buffer, offset, words);
    free(new_buffer);
 
    return result;
}
 
static int kinetis_ke_probe(struct flash_bank *bank)
{
    int result;
    uint32_t offset = 0;
    struct target *target = bank->target;
    struct kinetis_ke_flash_bank *kinfo = bank->driver_priv;
 
    result = target_read_u32(target, SIM_SRSID, &kinfo->sim_srsid);
    if (result != ERROR_OK)
        return result;
 
    if (KINETIS_KE_SRSID_FAMID(kinfo->sim_srsid) != 0x00) {
        LOG_ERROR("Unsupported KE family");
        return ERROR_FLASH_OPER_UNSUPPORTED;
    }
 
    switch (KINETIS_KE_SRSID_SUBFAMID(kinfo->sim_srsid)) {
        case KINETIS_KE_SRSID_KEX2:
            LOG_INFO("KE02 sub-family");
            break;
 
        case KINETIS_KE_SRSID_KEX4:
            LOG_INFO("KE04 sub-family");
            break;
 
        case KINETIS_KE_SRSID_KEX6:
            LOG_INFO("KE06 sub-family");
            break;
 
        default:
            LOG_ERROR("Unsupported KE sub-family");
            return ERROR_FLASH_OPER_UNSUPPORTED;
    }
 
    /* We can only retrieve the ke0x part, but there is no way to know
     * the flash size, so assume the maximum flash size for the entire
     * sub family.
     */
    bank->base = 0x00000000;
    kinfo->sector_size = 512;
 
    switch (KINETIS_KE_SRSID_SUBFAMID(kinfo->sim_srsid)) {
 
        case KINETIS_KE_SRSID_KEX2:
            /* Max. 64KB */
            bank->size = 0x00010000;
            bank->num_sectors = 128;
 
            /* KE02 uses the FTMRH flash controller,
             * and registers have a different offset from the
             * FTMRE flash controller. Sort this out here.
             */
            kinfo->ftmrx_fclkdiv_addr = 0x40020000;
            kinfo->ftmrx_fccobix_addr = 0x40020002;
            kinfo->ftmrx_fstat_addr = 0x40020006;
            kinfo->ftmrx_fprot_addr = 0x40020008;
            kinfo->ftmrx_fccobhi_addr = 0x4002000A;
            kinfo->ftmrx_fccoblo_addr = 0x4002000B;
            break;
 
        case KINETIS_KE_SRSID_KEX6:
        case KINETIS_KE_SRSID_KEX4:
            /* Max. 128KB */
            bank->size = 0x00020000;
            bank->num_sectors = 256;
 
            /* KE04 and KE06 use the FTMRE flash controller,
             * and registers have a different offset from the
             * FTMRH flash controller. Sort this out here.
             */
            kinfo->ftmrx_fclkdiv_addr = 0x40020003;
            kinfo->ftmrx_fccobix_addr = 0x40020001;
            kinfo->ftmrx_fstat_addr = 0x40020005;
            kinfo->ftmrx_fprot_addr = 0x4002000B;
            kinfo->ftmrx_fccobhi_addr = 0x40020009;
            kinfo->ftmrx_fccoblo_addr = 0x40020008;
            break;
    }
 
    free(bank->sectors);
 
    assert(bank->num_sectors > 0);
    bank->sectors = malloc(sizeof(struct flash_sector) * bank->num_sectors);
 
    for (unsigned int i = 0; i < bank->num_sectors; i++) {
        bank->sectors[i].offset = offset;
        bank->sectors[i].size = kinfo->sector_size;
        offset += kinfo->sector_size;
        bank->sectors[i].is_erased = -1;
        bank->sectors[i].is_protected = 1;
    }
 
    return ERROR_OK;
}
 
static int kinetis_ke_auto_probe(struct flash_bank *bank)
{
    struct kinetis_ke_flash_bank *kinfo = bank->driver_priv;
 
    if (kinfo->sim_srsid)
        return ERROR_OK;
 
    return kinetis_ke_probe(bank);
}
 
static int kinetis_ke_info(struct flash_bank *bank, struct command_invocation *cmd)
{
    command_print_sameline(cmd, "%s driver for flash bank %s at " TARGET_ADDR_FMT,
            bank->driver->name, bank->name, bank->base);
 
    return ERROR_OK;
}
 
static int kinetis_ke_blank_check(struct flash_bank *bank)
{
    uint8_t FCCOBIX[3], FCCOBHI[3], FCCOBLO[3], fstat;
    uint16_t longwords = 0;
    int result;
 
    if (bank->target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
        return ERROR_TARGET_NOT_HALTED;
    }
 
    result = kinetis_ke_prepare_flash(bank);
    if (result != ERROR_OK)
        return result;
 
    /* check if whole bank is blank */
    FCCOBIX[0] = 0;
    FCCOBHI[0] = FTMRX_CMD_ALLERASED;
 
    result = kinetis_ke_ftmrx_command(bank, 1, FCCOBIX, FCCOBHI, NULL, &fstat);
 
    if (result != ERROR_OK)
        return result;
 
    if (fstat & (FTMRX_FSTAT_MGSTAT0_MASK | FTMRX_FSTAT_MGSTAT1_MASK)) {
        /* the whole bank is not erased, check sector-by-sector */
        for (unsigned int i = 0; i < bank->num_sectors; i++) {
            FCCOBIX[0] = 0;
            FCCOBHI[0] = FTMRX_CMD_SECTIONERASED;
            FCCOBLO[0] = (bank->base + bank->sectors[i].offset) >> 16;
 
            FCCOBIX[1] = 1;
            FCCOBHI[1] = (bank->base + bank->sectors[i].offset) >> 8;
            FCCOBLO[1] = (bank->base + bank->sectors[i].offset);
 
            longwords = 128;
 
            FCCOBIX[2] = 2;
            FCCOBHI[2] = longwords >> 8;
            FCCOBLO[2] = longwords;
 
            result = kinetis_ke_ftmrx_command(bank, 3, FCCOBIX, FCCOBHI, FCCOBLO, &fstat);
 
            if (result == ERROR_OK) {
                bank->sectors[i].is_erased = !(fstat & (FTMRX_FSTAT_MGSTAT0_MASK | FTMRX_FSTAT_MGSTAT1_MASK));
            } else {
                LOG_DEBUG("Ignoring error on PFlash sector blank-check");
                bank->sectors[i].is_erased = -1;
            }
        }
    } else {
        /* the whole bank is erased, update all sectors */
        for (unsigned int i = 0; i < bank->num_sectors; i++)
            bank->sectors[i].is_erased = 1;
    }
 
    return ERROR_OK;
}
 
static const struct command_registration kinetis_ke_security_command_handlers[] = {
    {
        .name = "check_security",
        .mode = COMMAND_EXEC,
        .help = "Check status of device security lock",
        .usage = "",
        .handler = kinetis_ke_check_flash_security_status,
    },
    {
        .name = "mass_erase",
        .mode = COMMAND_EXEC,
        .help = "Issue a complete flash erase via the MDM-AP",
        .usage = "",
        .handler = kinetis_ke_mdm_mass_erase,
    },
    COMMAND_REGISTRATION_DONE
};
 
static const struct command_registration kinetis_ke_exec_command_handlers[] = {
    {
        .name = "mdm",
        .mode = COMMAND_ANY,
        .help = "MDM-AP command group",
        .usage = "",
        .chain = kinetis_ke_security_command_handlers,
    },
    {
        .name = "disable_wdog",
        .mode = COMMAND_EXEC,
        .help = "Disable the watchdog timer",
        .usage = "",
        .handler = kinetis_ke_disable_wdog_handler,
    },
    COMMAND_REGISTRATION_DONE
};
 
static const struct command_registration kinetis_ke_command_handler[] = {
    {
        .name = "kinetis_ke",
        .mode = COMMAND_ANY,
        .help = "Kinetis KE flash controller commands",
        .usage = "",
        .chain = kinetis_ke_exec_command_handlers,
    },
    COMMAND_REGISTRATION_DONE
};
 
const struct flash_driver kinetis_ke_flash = {
    .name = "kinetis_ke",
    .commands = kinetis_ke_command_handler,
    .flash_bank_command = kinetis_ke_flash_bank_command,
    .erase = kinetis_ke_erase,
    .protect = kinetis_ke_protect,
    .write = kinetis_ke_write,
    .read = default_flash_read,
    .probe = kinetis_ke_probe,
    .auto_probe = kinetis_ke_auto_probe,
    .erase_check = kinetis_ke_blank_check,
    .protect_check = kinetis_ke_protect_check,
    .info = kinetis_ke_info,
    .free_driver_priv = default_flash_free_driver_priv,
};