at91sam4l.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *   Copyright (C) 2013 by Andrey Yurovsky                                 *
 *   Andrey Yurovsky <yurovsky@gmail.com>                                  *
 ***************************************************************************/
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "imp.h"
 
#include <jtag/jtag.h>
#include <target/cortex_m.h>
 
/* At this time, the SAM4L Flash is available in these capacities:
 * ATSAM4Lx4xx: 256KB (512 pages)
 * ATSAM4Lx2xx: 128KB (256 pages)
 * ATSAM4Lx8xx: 512KB (1024 pages)
 */
 
/* There are 16 lockable regions regardless of overall capacity. The number
 * of pages per sector is therefore dependant on capacity. */
#define SAM4L_NUM_SECTORS 16
 
/* Locations in memory map */
#define SAM4L_FLASH         ((uint32_t)0x00000000) /* Flash region */
#define SAM4L_FLASH_USER    0x00800000 /* Flash user page region */
#define SAM4L_FLASHCALW     0x400A0000 /* Flash controller */
#define SAM4L_CHIPID        0x400E0740 /* Chip Identification */
 
/* Offsets from SAM4L_FLASHCALW */
#define SAM4L_FCR           0x00 /* Flash Control Register (RW) */
#define SAM4L_FCMD          0x04 /* Flash Command Register (RW) */
#define SAM4L_FSR           0x08 /* Flash Status Register (RO) */
#define SAM4L_FPR           0x0C /* Flash Parameter Register (RO) */
#define SAM4L_FVR           0x10 /* Flash Version Register (RO) */
#define SAM4L_FGPFRHI       0x14 /* Flash General Purpose Register High (RO) */
#define SAM4L_FGPFRLO       0x18 /* Flash General Purpose Register Low (RO) */
 
/* Offsets from SAM4L_CHIPID */
#define SAM4L_CIDR          0x00 /* Chip ID Register (RO) */
#define SAM4L_EXID          0x04 /* Chip ID Extension Register (RO) */
 
/* Flash commands (for SAM4L_FCMD), see Table 14-5 */
#define SAM4L_FCMD_NOP      0    /* No Operation */
#define SAM4L_FCMD_WP       1    /* Write Page */
#define SAM4L_FCMD_EP       2    /* Erase Page */
#define SAM4L_FCMD_CPB      3    /* Clear Page Buffer */
#define SAM4L_FCMD_LP       4    /* Lock region containing given page */
#define SAM4L_FCMD_UP       5    /* Unlock region containing given page */
#define SAM4L_FCMD_EA       6    /* Erase All */
#define SAM4L_FCMD_WGPB     7    /* Write general-purpose fuse bit */
#define SAM4L_FCMD_EGPB     8    /* Erase general-purpose fuse bit */
#define SAM4L_FCMD_SSB      9    /* Set security fuses */
#define SAM4L_FCMD_PGPFB    10  /* Program general-purpose fuse byte */
#define SAM4L_FCMD_EAGPF    11  /* Erase all general-purpose fuse bits */
#define SAM4L_FCMD_QPR      12  /* Quick page read */
#define SAM4L_FCMD_WUP      13  /* Write user page */
#define SAM4L_FCMD_EUP      14  /* Erase user page */
#define SAM4L_FCMD_QPRUP    15  /* Quick page read (user page) */
#define SAM4L_FCMD_HSEN     16  /* High speed mode enable */
#define SAM4L_FCMD_HSDIS    17  /* High speed mode disable */
 
#define SAM4L_FMCD_CMDKEY   0xA5UL  /* 'key' to issue commands, see 14.10.2 */
 
 
/* SMAP registers and bits */
#define SMAP_BASE 0x400A3000
 
#define SMAP_SCR (SMAP_BASE + 8)
#define SMAP_SCR_HCR (1 << 1)
 
 
struct sam4l_chip_info {
    uint32_t id;
    uint32_t exid;
    const char *name;
};
 
/* These are taken from Table 9-1 in 42023E-SAM-07/2013 */
static const struct sam4l_chip_info sam4l_known_chips[] = {
    { 0xAB0B0AE0, 0x1400000F, "ATSAM4LC8C" },
    { 0xAB0A09E0, 0x0400000F, "ATSAM4LC4C" },
    { 0xAB0A07E0, 0x0400000F, "ATSAM4LC2C" },
    { 0xAB0B0AE0, 0x1300000F, "ATSAM4LC8B" },
    { 0xAB0A09E0, 0x0300000F, "ATSAM4LC4B" },
    { 0xAB0A07E0, 0x0300000F, "ATSAM4LC2B" },
    { 0xAB0B0AE0, 0x1200000F, "ATSAM4LC8A" },
    { 0xAB0A09E0, 0x0200000F, "ATSAM4LC4A" },
    { 0xAB0A07E0, 0x0200000F, "ATSAM4LC2A" },
    { 0xAB0B0AE0, 0x14000002, "ATSAM4LS8C" },
    { 0xAB0A09E0, 0x04000002, "ATSAM4LS4C" },
    { 0xAB0A07E0, 0x04000002, "ATSAM4LS2C" },
    { 0xAB0B0AE0, 0x13000002, "ATSAM4LS8B" },
    { 0xAB0A09E0, 0x03000002, "ATSAM4LS4B" },
    { 0xAB0A07E0, 0x03000002, "ATSAM4LS2B" },
    { 0xAB0B0AE0, 0x12000002, "ATSAM4LS8A" },
    { 0xAB0A09E0, 0x02000002, "ATSAM4LS4A" },
    { 0xAB0A07E0, 0x02000002, "ATSAM4LS2A" },
};
 
/* Meaning of SRAMSIZ field in CHIPID, see 9.3.1 in 42023E-SAM-07/2013 */
static const uint16_t sam4l_ram_sizes[16] = { 48, 1, 2, 6, 24, 4, 80, 160, 8, 16, 32, 64, 128, 256, 96, 512 };
 
/* Meaning of PSZ field in FPR, see 14.10.4 in 42023E-SAM-07/2013 */
static const uint16_t sam4l_page_sizes[8] = { 32, 64, 128, 256, 512, 1024, 2048, 4096 };
 
struct sam4l_info {
    const struct sam4l_chip_info *details;
 
    uint32_t flash_kb;
    uint32_t ram_kb;
    uint32_t page_size;
    int num_pages;
    int sector_size;
    unsigned int pages_per_sector;
 
    bool probed;
    struct target *target;
};
 
 
static int sam4l_flash_wait_until_ready(struct target *target)
{
    volatile unsigned int t = 0;
    uint32_t st;
    int res;
 
    /* Poll the status register until the FRDY bit is set */
    do {
        res = target_read_u32(target, SAM4L_FLASHCALW + SAM4L_FSR, &st);
    } while (res == ERROR_OK && !(st & (1<<0)) && ++t < 10);
 
    return res;
}
 
static int sam4l_flash_check_error(struct target *target, uint32_t *err)
{
    uint32_t st;
    int res;
 
    res = target_read_u32(target, SAM4L_FLASHCALW + SAM4L_FSR, &st);
 
    if (res == ERROR_OK)
        *err = st & ((1<<3) | (1<<2)); /* grab PROGE and LOCKE bits */
 
    return res;
}
 
static int sam4l_flash_command(struct target *target, uint8_t cmd, int page)
{
    int res;
    uint32_t fcmd;
    uint32_t err;
 
    res = sam4l_flash_wait_until_ready(target);
    if (res != ERROR_OK)
        return res;
 
    if (page >= 0) {
        /* Set the page number. For some commands, the page number is just an
         * argument (ex: fuse bit number). */
        fcmd = (SAM4L_FMCD_CMDKEY << 24) | ((page & 0xFFFF) << 8) | (cmd & 0x3F);
    } else {
        /* Reuse the page number that was read from the flash command register. */
        res = target_read_u32(target, SAM4L_FLASHCALW + SAM4L_FCMD, &fcmd);
        if (res != ERROR_OK)
            return res;
 
        fcmd &= ~0x3F; /* clear out the command code */
        fcmd |= (SAM4L_FMCD_CMDKEY << 24) | (cmd & 0x3F);
    }
 
    /* Send the command */
    res = target_write_u32(target, SAM4L_FLASHCALW + SAM4L_FCMD, fcmd);
    if (res != ERROR_OK)
        return res;
 
    res = sam4l_flash_check_error(target, &err);
    if (res != ERROR_OK)
        return res;
 
    if (err != 0)
        LOG_ERROR("%s got error status 0x%08" PRIx32, __func__, err);
 
    return sam4l_flash_wait_until_ready(target);
}
 
FLASH_BANK_COMMAND_HANDLER(sam4l_flash_bank_command)
{
    if (bank->base != SAM4L_FLASH) {
        LOG_ERROR("Address " TARGET_ADDR_FMT
                " invalid bank address (try 0x%08" PRIx32
                "[at91sam4l series] )",
                bank->base, SAM4L_FLASH);
        return ERROR_FAIL;
    }
 
    struct sam4l_info *chip;
    chip = calloc(1, sizeof(*chip));
    if (!chip) {
        LOG_ERROR("No memory for flash bank chip info");
        return ERROR_FAIL;
    }
 
    chip->target = bank->target;
    chip->probed = false;
 
    bank->driver_priv = chip;
 
    return ERROR_OK;
}
 
static const struct sam4l_chip_info *sam4l_find_chip_name(uint32_t id, uint32_t exid)
{
    unsigned int i;
 
    id &= ~0xF;
 
    for (i = 0; i < ARRAY_SIZE(sam4l_known_chips); i++) {
        if (sam4l_known_chips[i].id == id && sam4l_known_chips[i].exid == exid)
            return &sam4l_known_chips[i];
    }
 
    return NULL;
}
 
static int sam4l_check_page_erased(struct flash_bank *bank, uint32_t pn,
        bool *is_erased_p)
{
    int res;
    uint32_t st;
 
    /* Issue a quick page read to verify that we've erased this page */
    res = sam4l_flash_command(bank->target, SAM4L_FCMD_QPR, pn);
    if (res != ERROR_OK) {
        LOG_ERROR("Quick page read %" PRIu32 " failed", pn);
        return res;
    }
 
    /* Retrieve the flash status */
    res = target_read_u32(bank->target, SAM4L_FLASHCALW + SAM4L_FSR, &st);
    if (res != ERROR_OK) {
        LOG_ERROR("Couldn't read erase status");
        return res;
    }
 
    /* Is the page in question really erased? */
    *is_erased_p = !!(st & (1<<5));
 
    return ERROR_OK;
}
 
static int sam4l_probe(struct flash_bank *bank)
{
    uint32_t id, exid, param;
    int res;
    struct sam4l_info *chip = (struct sam4l_info *)bank->driver_priv;
 
    if (chip->probed)
        return ERROR_OK;
 
    res = target_read_u32(bank->target, SAM4L_CHIPID + SAM4L_CIDR, &id);
    if (res != ERROR_OK) {
        LOG_ERROR("Couldn't read chip ID");
        return res;
    }
 
    res = target_read_u32(bank->target, SAM4L_CHIPID + SAM4L_EXID, &exid);
    if (res != ERROR_OK) {
        LOG_ERROR("Couldn't read extended chip ID");
        return res;
    }
 
    chip->details = sam4l_find_chip_name(id, exid);
 
    /* The RAM capacity is in a lookup table. */
    chip->ram_kb = sam4l_ram_sizes[0xF & (id >> 16)];
 
    switch (0xF & (id >> 8)) {
    case 0x07:
        chip->flash_kb = 128;
        break;
    case 0x09:
        chip->flash_kb = 256;
        break;
    case 0x0A:
        chip->flash_kb = 512;
        break;
    default:
        LOG_ERROR("Unknown flash size (chip ID is %08" PRIx32 "), assuming 128K", id);
        chip->flash_kb = 128;
        break;
    }
 
    /* Retrieve the Flash parameters */
    res = target_read_u32(bank->target, SAM4L_FLASHCALW + SAM4L_FPR, &param);
    if (res != ERROR_OK) {
        LOG_ERROR("Couldn't read Flash parameters");
        return res;
    }
 
    /* Fetch the page size from the parameter register. Technically the flash
     * capacity is there too though the manual mentions that not all parts will
     * have it set so we use the Chip ID capacity information instead. */
    chip->page_size = sam4l_page_sizes[0x7 & (param >> 8)];
    assert(chip->page_size);
    chip->num_pages = chip->flash_kb * 1024 / chip->page_size;
 
    chip->sector_size = (chip->flash_kb * 1024) / SAM4L_NUM_SECTORS;
    chip->pages_per_sector = chip->sector_size / chip->page_size;
 
    /* Make sure the bank size is correct */
    bank->size = chip->flash_kb * 1024;
 
    /* Allocate the sector table. */
    bank->num_sectors = SAM4L_NUM_SECTORS;
    bank->sectors = calloc(bank->num_sectors, (sizeof((bank->sectors)[0])));
    if (!bank->sectors)
        return ERROR_FAIL;
 
    /* Fill out the sector information: all SAM4L sectors are the same size and
     * there is always a fixed number of them. */
    for (unsigned int i = 0; i < bank->num_sectors; i++) {
        bank->sectors[i].size = chip->sector_size;
        bank->sectors[i].offset = i * chip->sector_size;
        /* mark as unknown */
        bank->sectors[i].is_erased = -1;
        bank->sectors[i].is_protected = -1;
    }
 
    /* Done */
    chip->probed = true;
 
    LOG_INFO("SAM4L MCU: %s (Rev %c) (%" PRIu32 "KB Flash with %d %" PRIu32 "B pages, %" PRIu32 "KB RAM)",
            chip->details ? chip->details->name : "unknown", (char)('A' + (id & 0xF)),
            chip->flash_kb, chip->num_pages, chip->page_size, chip->ram_kb);
 
    return ERROR_OK;
}
 
static int sam4l_protect_check(struct flash_bank *bank)
{
    int res;
    uint32_t st;
    struct sam4l_info *chip = (struct sam4l_info *)bank->driver_priv;
 
    if (bank->target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
 
        return ERROR_TARGET_NOT_HALTED;
    }
 
    if (!chip->probed) {
        if (sam4l_probe(bank) != ERROR_OK)
            return ERROR_FLASH_BANK_NOT_PROBED;
    }
 
    res = target_read_u32(bank->target, SAM4L_FLASHCALW + SAM4L_FSR, &st);
    if (res != ERROR_OK)
        return res;
 
    st >>= 16; /* There are 16 lock region bits in the upper half word */
    for (unsigned int i = 0; i < bank->num_sectors; i++)
        bank->sectors[i].is_protected = !!(st & (1<<i));
 
    return ERROR_OK;
}
 
static int sam4l_protect(struct flash_bank *bank, int set, unsigned int first,
        unsigned int last)
{
    struct sam4l_info *chip = (struct sam4l_info *)bank->driver_priv;
 
    if (bank->target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
 
        return ERROR_TARGET_NOT_HALTED;
    }
 
    if (!chip->probed) {
        if (sam4l_probe(bank) != ERROR_OK)
            return ERROR_FLASH_BANK_NOT_PROBED;
    }
 
    /* Make sure the pages make sense. */
    if (first >= bank->num_sectors || last >= bank->num_sectors) {
        LOG_ERROR("Protect range %u - %u not valid (%u sectors total)", first, last,
                bank->num_sectors);
        return ERROR_FAIL;
    }
 
    /* Try to lock or unlock each sector in the range.  This is done by locking
     * a region containing one page in that sector, we arbitrarily choose the 0th
     * page in the sector. */
    for (unsigned int i = first; i <= last; i++) {
        int res;
 
        res = sam4l_flash_command(bank->target,
                set ? SAM4L_FCMD_LP : SAM4L_FCMD_UP, i * chip->pages_per_sector);
        if (res != ERROR_OK) {
            LOG_ERROR("Can't %slock region containing page %d", set ? "" : "un", i);
            return res;
        }
    }
 
    return ERROR_OK;
}
 
static int sam4l_erase(struct flash_bank *bank, unsigned int first,
        unsigned int last)
{
    int ret;
    struct sam4l_info *chip = (struct sam4l_info *)bank->driver_priv;
 
    if (bank->target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
 
        return ERROR_TARGET_NOT_HALTED;
    }
 
    if (!chip->probed) {
        if (sam4l_probe(bank) != ERROR_OK)
            return ERROR_FLASH_BANK_NOT_PROBED;
    }
 
    /* Make sure the pages make sense. */
    if (first >= bank->num_sectors || last >= bank->num_sectors) {
        LOG_ERROR("Erase range %u - %u not valid (%u sectors total)", first, last,
                bank->num_sectors);
        return ERROR_FAIL;
    }
 
    /* Erase */
    if ((first == 0) && ((last + 1) == bank->num_sectors)) {
        LOG_DEBUG("Erasing the whole chip");
 
        ret = sam4l_flash_command(bank->target, SAM4L_FCMD_EA, -1);
        if (ret != ERROR_OK) {
            LOG_ERROR("Erase All failed");
            return ret;
        }
    } else {
        LOG_DEBUG("Erasing sectors %u through %u...\n", first, last);
 
        /* For each sector... */
        for (unsigned int i = first; i <= last; i++) {
            /* For each page in that sector... */
            for (unsigned int j = 0; j < chip->pages_per_sector; j++) {
                unsigned int pn = i * chip->pages_per_sector + j;
                bool is_erased = false;
 
                /* Issue the page erase */
                ret = sam4l_flash_command(bank->target, SAM4L_FCMD_EP, pn);
                if (ret != ERROR_OK) {
                    LOG_ERROR("Erasing page %u failed", pn);
                    return ret;
                }
 
                ret = sam4l_check_page_erased(bank, pn, &is_erased);
                if (ret != ERROR_OK)
                    return ret;
 
                if (!is_erased) {
                    LOG_DEBUG("Page %u was not erased.", pn);
                    return ERROR_FAIL;
                }
            }
        }
    }
 
    return ERROR_OK;
}
 
/* Write an entire page from host buffer 'buf' to page-aligned 'address' in the
 * Flash. */
static int sam4l_write_page(struct sam4l_info *chip, struct target *target,
        uint32_t address, const uint8_t *buf)
{
    int res;
 
    LOG_DEBUG("sam4l_write_page address=%08" PRIx32, address);
 
    /* Clear the page buffer before we write to it */
    res = sam4l_flash_command(target, SAM4L_FCMD_CPB, -1);
    if (res != ERROR_OK) {
        LOG_ERROR("%s: can't clear page buffer", __func__);
        return res;
    }
 
    /* Write the modified page back to the target's page buffer */
    res = target_write_memory(target, address, 4, chip->page_size / 4, buf);
 
    if (res != ERROR_OK) {
        LOG_ERROR("%s: %d", __func__, __LINE__);
        return res;
    }
 
    /* Commit the page contents to Flash: erase the current page and then
     * write it out. */
    res = sam4l_flash_command(target, SAM4L_FCMD_EP, -1);
    if (res != ERROR_OK)
        return res;
    return sam4l_flash_command(target, SAM4L_FCMD_WP, -1);
}
 
/* Write partial contents into page-aligned 'address' on the Flash from host
 * buffer 'buf' by writing 'nb' of 'buf' at 'offset' into the Flash page. */
static int sam4l_write_page_partial(struct sam4l_info *chip,
        struct flash_bank *bank, uint32_t address, const uint8_t *buf,
        uint32_t page_offset, uint32_t nb)
{
    int res;
    uint8_t *pg = malloc(chip->page_size);
    if (!pg)
        return ERROR_FAIL;
 
    LOG_DEBUG("sam4l_write_page_partial address=%08" PRIx32 " nb=%08" PRIx32, address, nb);
 
    assert(page_offset + nb < chip->page_size);
    assert((address % chip->page_size) == 0);
 
    /* Retrieve the full page contents from Flash */
    res = target_read_memory(bank->target, address, 4,
            chip->page_size / 4, pg);
    if (res != ERROR_OK) {
        free(pg);
        return res;
    }
 
    /* Insert our partial page over the data from Flash */
    memcpy(pg + (page_offset % chip->page_size), buf, nb);
 
    /* Write the page back out */
    res = sam4l_write_page(chip, bank->target, address, pg);
    free(pg);
 
    return res;
}
 
static int sam4l_write(struct flash_bank *bank, const uint8_t *buffer,
        uint32_t offset, uint32_t count)
{
    int res;
    uint32_t nb = 0;
    struct sam4l_info *chip = (struct sam4l_info *)bank->driver_priv;
 
    LOG_DEBUG("sam4l_write offset=%08" PRIx32 " count=%08" PRIx32, offset, count);
 
    if (bank->target->state != TARGET_HALTED) {
        LOG_ERROR("Target not halted");
 
        return ERROR_TARGET_NOT_HALTED;
    }
 
    if (!chip->probed) {
        if (sam4l_probe(bank) != ERROR_OK)
            return ERROR_FLASH_BANK_NOT_PROBED;
    }
 
    if (offset % chip->page_size) {
        /* We're starting at an unaligned offset so we'll write a partial page
         * comprising that offset and up to the end of that page. */
        nb = chip->page_size - (offset % chip->page_size);
        if (nb > count)
            nb = count;
    } else if (count < chip->page_size) {
        /* We're writing an aligned but partial page. */
        nb = count;
    }
 
    if (nb > 0) {
        res = sam4l_write_page_partial(chip, bank,
                (offset / chip->page_size) * chip->page_size + bank->base,
                buffer,
                offset % chip->page_size, nb);
        if (res != ERROR_OK)
            return res;
 
        /* We're done with the page contents */
        count -= nb;
        offset += nb;
    }
 
    /* There's at least one aligned page to write out. */
    if (count >= chip->page_size) {
        assert(chip->page_size > 0);
        int np = count / chip->page_size + ((count % chip->page_size) ? 1 : 0);
 
        for (int i = 0; i < np; i++) {
            if (count >= chip->page_size) {
                res = sam4l_write_page(chip, bank->target,
                        bank->base + offset,
                        buffer + (i * chip->page_size));
                /* Advance one page */
                offset += chip->page_size;
                count -= chip->page_size;
            } else {
                res = sam4l_write_page_partial(chip, bank,
                        bank->base + offset,
                        buffer + (i * chip->page_size), 0, count);
                /* We're done after this. */
                offset += count;
                count = 0;
            }
 
            if (res != ERROR_OK)
                return res;
        }
    }
 
    return ERROR_OK;
}
 
 
COMMAND_HANDLER(sam4l_handle_reset_deassert)
{
    struct target *target = get_current_target(CMD_CTX);
    int retval = ERROR_OK;
    enum reset_types jtag_reset_config = jtag_get_reset_config();
 
    /* If the target has been unresponsive before, try to re-establish
     * communication now - CPU is held in reset by DSU, DAP is working */
    if (!target_was_examined(target))
        target_examine_one(target);
    target_poll(target);
 
    /* In case of sysresetreq, debug retains state set in cortex_m_assert_reset()
     * so we just release reset held by SMAP
     *
     * n_RESET (srst) clears the DP, so reenable debug and set vector catch here
     *
     * After vectreset SMAP release is not needed however makes no harm
     */
    if (target->reset_halt && (jtag_reset_config & RESET_HAS_SRST)) {
        retval = target_write_u32(target, DCB_DHCSR, DBGKEY | C_HALT | C_DEBUGEN);
        if (retval == ERROR_OK)
            retval = target_write_u32(target, DCB_DEMCR,
                TRCENA | VC_HARDERR | VC_BUSERR | VC_CORERESET);
        /* do not return on error here, releasing SMAP reset is more important */
    }
 
    int retval2 = target_write_u32(target, SMAP_SCR, SMAP_SCR_HCR);
    if (retval2 != ERROR_OK)
        return retval2;
 
    return retval;
}
 
static const struct command_registration at91sam4l_exec_command_handlers[] = {
    {
        .name = "smap_reset_deassert",
        .handler = sam4l_handle_reset_deassert,
        .mode = COMMAND_EXEC,
        .help = "deassert internal reset held by SMAP",
        .usage = "",
    },
    COMMAND_REGISTRATION_DONE
};
 
static const struct command_registration at91sam4l_command_handlers[] = {
    {
        .name = "at91sam4l",
        .mode = COMMAND_ANY,
        .help = "at91sam4l flash command group",
        .usage = "",
        .chain = at91sam4l_exec_command_handlers,
    },
    COMMAND_REGISTRATION_DONE
};
 
const struct flash_driver at91sam4l_flash = {
    .name = "at91sam4l",
    .commands = at91sam4l_command_handlers,
    .flash_bank_command = sam4l_flash_bank_command,
    .erase = sam4l_erase,
    .protect = sam4l_protect,
    .write = sam4l_write,
    .read = default_flash_read,
    .probe = sam4l_probe,
    .auto_probe = sam4l_probe,
    .erase_check = default_flash_blank_check,
    .protect_check = sam4l_protect_check,
    .free_driver_priv = default_flash_free_driver_priv,
};