target_atmel_cm3.c

/*
 * Copyright (c) 2013-2017, Alex Taradov <alex@taradov.com>
 * Copyright (c) 2015, Thibaut VIARD for derivative work from original target_atmel_cm4.c and SAM3X/A port
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

/*- Includes ----------------------------------------------------------------*/
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#include <string.h>
#include "target.h"
#include "edbg.h"
#include "dap.h"

/*- Definitions -------------------------------------------------------------*/
#define ARM_DAP_DHCSR          0xe000edf0
#define ARM_DAP_DEMCR          0xe000edfc
#define ARM_SCB_AIRCR          0xe000ed0c

#define CHIPID_CIDR(b)         ((b) + 0x00)
#define CHIPID_EXID(b)         ((b) + 0x04)

#define EEFC_FMR(b)            ((b) + 0x00) // EEFC Flash Mode Register
#define EEFC_FCR(b)            ((b) + 0x04) // EEFC Flash Command Register
#define EEFC_FSR(b)            ((b) + 0x08) // EEFC Flash Status Register
#define EEFC_FRR(b)            ((b) + 0x0c) // EEFC Flash Result Register
#define FSR_FRDY               (1ul)

#define CMD_GETD               0x5a000000 // Get Flash Descriptor
#define CMD_EWP                0x5a000003 // Erase page and write page
#define CMD_EA                 0x5a000005 // Erase all
#define CMD_SGPB               0x5a00000b // Set GPNVM Bit

#define FLASH_PAGE_SIZE        256
#define CHIPID_EXID_VALUE      0

/*- Types -------------------------------------------------------------------*/
typedef struct
{
  uint32_t  chip_id;
  char      *name;
  uint32_t  chipid_base;
  int       n_planes;
  struct
  {
    uint32_t  eefc_base;
    uint32_t  addr;
    uint32_t  size;
  } plane[2];
} device_t;

/*- Variables ---------------------------------------------------------------*/
static device_t devices[] =
{
  { 0x286E0A60, "ATSAM3X8H", 0x400e0940, 2, {{ 0x400e0a00, 0x80000, 256*1024 }, { 0x400e0c00, 0xc0000, 256*1024 }} },
  { 0x285E0A60, "ATSAM3X8E", 0x400e0940, 2, {{ 0x400e0a00, 0x80000, 256*1024 }, { 0x400e0c00, 0xc0000, 256*1024 }} },
  { 0x285B0960, "ATSAM3X4E", 0x400e0940, 2, {{ 0x400e0a00, 0x80000, 128*1024 }, { 0x400e0c00, 0xa0000, 128*1024 }} },
  { 0x284E0A60, "ATSAM3X8C", 0x400e0940, 2, {{ 0x400e0a00, 0x80000, 256*1024 }, { 0x400e0c00, 0xc0000, 256*1024 }} },
  { 0x284B0960, "ATSAM3X4C", 0x400e0940, 2, {{ 0x400e0a00, 0x80000, 128*1024 }, { 0x400e0c00, 0xa0000, 128*1024 }} },
  { 0x283E0A60, "ATSAM3A8C", 0x400e0940, 2, {{ 0x400e0a00, 0x80000, 256*1024 }, { 0x400e0c00, 0xc0000, 256*1024 }} },
  { 0x283B0960, "ATSAM3A4C", 0x400e0940, 2, {{ 0x400e0a00, 0x80000, 128*1024 }, { 0x400e0c00, 0xa0000, 128*1024 }} },

  { 0x28000961, "ATSAM3U4C", 0x400e0740, 2, {{ 0x400e0800, 0x80000, 128*1024 }, { 0x400e0a00, 0x100000, 128*1024 }} },
  { 0x280A0761, "ATSAM3U2C", 0x400e0740, 1, {{ 0x400e0800, 0x80000, 128*1024 }} },
  { 0x28090561, "ATSAM3U1C", 0x400e0740, 1, {{ 0x400e0800, 0x80000,  64*1024 }} },
  { 0x28100961, "ATSAM3U4E", 0x400e0740, 2, {{ 0x400e0800, 0x80000, 128*1024 }, { 0x400e0a00, 0x100000, 128*1024 }} },
  { 0x281A0761, "ATSAM3U2E", 0x400e0740, 1, {{ 0x400e0800, 0x80000, 128*1024 }} },
  { 0x28190561, "ATSAM3U1E", 0x400e0740, 1, {{ 0x400e0800, 0x80000,  64*1024 }} },

  { 0 },
};

static device_t target_device;
static target_options_t target_options;

/*- Implementations ---------------------------------------------------------*/

//-----------------------------------------------------------------------------
static uint32_t get_flash_addr(uint32_t addr)
{
  uint32_t offs = addr;

  for (int i = 0; i < target_device.n_planes; i++)
  {
    if (offs >= target_device.plane[i].size)
      offs -= target_device.plane[i].size;
    else
      return target_device.plane[i].addr + offs;
  }

  error_exit("internal error in get_flash_addr()");

  return 0;
}

//-----------------------------------------------------------------------------
static uint32_t get_eefc_base(uint32_t addr)
{
  uint32_t flash_addr = get_flash_addr(addr);

  for (int i = 0; i < target_device.n_planes; i++)
  {
    uint32_t a = target_device.plane[i].addr;
    uint32_t s = target_device.plane[i].size;

    if (a <= flash_addr && flash_addr < (a + s))
      return target_device.plane[i].eefc_base;
  }

  error_exit("internal error in get_eefc_base()");

  return 0;
}

//-----------------------------------------------------------------------------
static void target_select(target_options_t *options)
{
  // Stop the core
  dap_write_word(ARM_DAP_DHCSR, 0xa05f0003);
  dap_write_word(ARM_DAP_DEMCR, 0x00000001);
  dap_write_word(ARM_SCB_AIRCR, 0x05fa0004);

  for (device_t *device = devices; device->chip_id > 0; device++)
  {
    uint32_t chip_id, chip_exid;

    chip_id = dap_read_word(CHIPID_CIDR(device->chipid_base));
    chip_exid = dap_read_word(CHIPID_EXID(device->chipid_base));

    if (device->chip_id == chip_id && CHIPID_EXID_VALUE == chip_exid)
    {
      uint32_t fl_id, fl_size, fl_page_size, fl_nb_palne, fl_nb_lock;
      uint32_t flash_size = 0;

      verbose("Target: %s\n", device->name);

      for (int i = 0; i < device->n_planes; i++)
      {
        uint32_t eefc_base = device->plane[i].eefc_base;

        dap_write_word(EEFC_FCR(eefc_base), CMD_GETD);
        while (0 == (dap_read_word(EEFC_FSR(eefc_base)) & FSR_FRDY));

        fl_id = dap_read_word(EEFC_FRR(eefc_base));
        check(fl_id, "Cannot read flash descriptor, check Erase pin state");

        fl_size = dap_read_word(EEFC_FRR(eefc_base));
        check(fl_size == device->plane[i].size, "Invalid reported Flash size (%d)", fl_size);

        fl_page_size = dap_read_word(EEFC_FRR(eefc_base));
        check(fl_page_size == FLASH_PAGE_SIZE, "Invalid reported page size (%d)", fl_page_size);

        fl_nb_palne = dap_read_word(EEFC_FRR(eefc_base));
        for (uint32_t i = 0; i < fl_nb_palne; i++)
          dap_read_word(EEFC_FRR(eefc_base));

        fl_nb_lock =  dap_read_word(EEFC_FRR(eefc_base));
        for (uint32_t i = 0; i < fl_nb_lock; i++)
          dap_read_word(EEFC_FRR(eefc_base));

        flash_size += fl_size;
      }

      target_device = *device;
      target_options = *options;

      target_check_options(&target_options, flash_size, FLASH_PAGE_SIZE);

      return;
    }
  }

  error_exit("unknown target device");
}

//-----------------------------------------------------------------------------
static void target_deselect(void)
{
  dap_write_word(ARM_DAP_DEMCR, 0x00000000);
  dap_write_word(ARM_SCB_AIRCR, 0x05fa0004);

  target_free_options(&target_options);
}

//-----------------------------------------------------------------------------
static void target_erase(void)
{
  for (int i = 0; i < target_device.n_planes; i++)
    dap_write_word(EEFC_FCR(target_device.plane[i].eefc_base), CMD_EA);

  for (int i = 0; i < target_device.n_planes; i++)
    while (0 == (dap_read_word(EEFC_FSR(target_device.plane[i].eefc_base)) & FSR_FRDY));
}

//-----------------------------------------------------------------------------
static void target_lock(void)
{
  for (int i = 0; i < target_device.n_planes; i++)
    dap_write_word(EEFC_FCR(target_device.plane[i].eefc_base), CMD_SGPB | (0 << 8));
}

//-----------------------------------------------------------------------------
static void target_program(void)
{
  uint32_t addr = target_options.offset;
  uint32_t number_of_pages, eefc_base;
  uint32_t offs = 0;
  uint8_t *buf = target_options.file_data;
  uint32_t size = target_options.file_size;

  number_of_pages = (size + FLASH_PAGE_SIZE - 1) / FLASH_PAGE_SIZE;

  for (uint32_t page = 0; page < number_of_pages; page++)
  {
    eefc_base = get_eefc_base(addr);

    dap_write_block(get_flash_addr(addr), &buf[offs], FLASH_PAGE_SIZE);

    dap_write_word(EEFC_FCR(eefc_base), CMD_EWP | (page << 8));
    while (0 == (dap_read_word(EEFC_FSR(eefc_base)) & FSR_FRDY));

    addr += FLASH_PAGE_SIZE;
    offs += FLASH_PAGE_SIZE;

    verbose(".");
  }

  // Set boot mode GPNVM bit
  dap_write_word(EEFC_FCR(get_eefc_base(0)), CMD_SGPB | (1 << 8));
}

//-----------------------------------------------------------------------------
static void target_verify(void)
{
  uint32_t addr = target_options.offset;
  uint32_t block_size;
  uint32_t offs = 0;
  uint8_t *bufb;
  uint8_t *bufa = target_options.file_data;
  uint32_t size = target_options.file_size;

  bufb = buf_alloc(FLASH_PAGE_SIZE);

  while (size)
  {
    dap_read_block(get_flash_addr(addr), bufb, FLASH_PAGE_SIZE);

    block_size = (size > FLASH_PAGE_SIZE) ? FLASH_PAGE_SIZE : size;

    for (int i = 0; i < (int)block_size; i++)
    {
      if (bufa[offs + i] != bufb[i])
      {
        verbose("\nat address 0x%x expected 0x%02x, read 0x%02x\n",
            addr + i, bufa[offs + i], bufb[i]);
        buf_free(bufb);
        error_exit("verification failed");
      }
    }

    addr += FLASH_PAGE_SIZE;
    offs += FLASH_PAGE_SIZE;
    size -= block_size;

    verbose(".");
  }

  buf_free(bufb);
}

//-----------------------------------------------------------------------------
static void target_read(void)
{
  uint32_t addr = target_options.offset;
  uint32_t offs = 0;
  uint8_t *buf = target_options.file_data;
  uint32_t size = target_options.size;

  while (size)
  {
    dap_read_block(get_flash_addr(addr), &buf[offs], FLASH_PAGE_SIZE);

    addr += FLASH_PAGE_SIZE;
    offs += FLASH_PAGE_SIZE;
    size -= FLASH_PAGE_SIZE;

    verbose(".");
  }

  save_file(target_options.name, buf, target_options.size);
}

//-----------------------------------------------------------------------------
target_ops_t target_atmel_cm3_ops =
{
  .select   = target_select,
  .deselect = target_deselect,
  .erase    = target_erase,
  .lock     = target_lock,
  .program  = target_program,
  .verify   = target_verify,
  .read     = target_read,
};