riscv-openocd/src/flash/nor/dsp5680xx_flash.c

/***************************************************************************
 *   Copyright (C) 2011 by Rodrigo L. Rosa                                 *
 *   rodrigorosa.LG@gmail.com                                              *
 *                                                                         *
 *   Based on a file written by:                                           *
 *   Kevin McGuire                                                         *
 *   Marcel Wijlaars                                                       *
 *   Michael Ashton                                                        *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 ***************************************************************************/

/**
 * @file   dsp5680xx_flash.c
 * @author Rodrigo L. Rosa <rodrigorosa.LG@gmail.com>
 * @date   Thu Jun  9 18:21:58 2011
 * 
 * @brief  This file implements the basic functions to run flashing commands
 * from the TCL interface.
 * It allows the user to flash the Freescale 5680xx DSP.
 * 
 * 
 */


#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifndef DSP5680XX_FLASH_H
#define DSP5680XX_FLASH_H

#include "imp.h"
#include <helper/binarybuffer.h>
#include <helper/time_support.h>
#include <target/algorithm.h>
#include <target/dsp5680xx.h>

struct dsp5680xx_flash_bank {
	struct working_area *write_algorithm;
};

static int dsp5680xx_build_sector_list(struct flash_bank *bank){
  uint32_t offset = HFM_FLASH_BASE_ADDR;
  bank->sectors = malloc(sizeof(struct flash_sector) * bank->num_sectors);
  int i;
  for (i = 0; i < bank->num_sectors; ++i){
    bank->sectors[i].offset = i*HFM_SECTOR_SIZE;
    bank->sectors[i].size = HFM_SECTOR_SIZE;
    offset += bank->sectors[i].size;
    bank->sectors[i].is_erased = -1;
    bank->sectors[i].is_protected = -1;
  }
  LOG_USER("%s not tested yet.",__FUNCTION__);
  return ERROR_OK;

}

// flash bank dsp5680xx 0 0 0 0 <target#>
FLASH_BANK_COMMAND_HANDLER(dsp5680xx_flash_bank_command){
  struct dsp5680xx_flash_bank *nbank;

  nbank = malloc(sizeof(struct dsp5680xx_flash_bank));

  bank->base = HFM_FLASH_BASE_ADDR;
  bank->size = HFM_SIZE_BYTES; // top 4k not accessible
  bank->driver_priv = nbank;
  bank->num_sectors = HFM_SECTOR_COUNT;
  dsp5680xx_build_sector_list(bank);

  return ERROR_OK;
}

/** 
 * A memory mapped register (PROT) holds information regarding sector protection.
 * Protection refers to undesired core access.
 * The value in this register is loaded from flash upon reset.
 * 
 * @param bank 
 * 
 * @return 
 */
static int dsp5680xx_flash_protect_check(struct flash_bank *bank){
  int retval = ERROR_OK;
  uint16_t protected = 0;
    retval = dsp5680xx_f_protect_check(bank->target,&protected);
  if(retval != ERROR_OK){
    for(int i = 0;i<HFM_SECTOR_COUNT;i++)
      bank->sectors[i].is_protected = -1;
    return ERROR_OK;
  }
  for(int i = 0;i<HFM_SECTOR_COUNT/2;i++){
    if(protected & 1){
      bank->sectors[2*i].is_protected = 1;
      bank->sectors[2*i+1].is_protected = 1;
    }else{
      bank->sectors[2*i].is_protected = 0;
      bank->sectors[2*i+1].is_protected = 0;
    }
    protected = (protected >> 1);
  }
  return retval;
}

/** 
 * Protection funcionality is not implemented.
 * The current implementation applies/removes security on the chip.
 * The chip is effectively secured/unsecured after the first reset following the execution of this function.
 * 
 * @param bank 
 * @param set Apply or remove security on the chip.
 * @param first This parameter is ignored.
 * @param last This parameter is ignored.
 * 
 * @return 
 */
static int dsp5680xx_flash_protect(struct flash_bank *bank, int set, int first, int last){
  // This applies security to flash module after next reset, it does not actually apply protection (protection refers to undesired access from the core)
  int retval;
  if(set)
    retval = dsp5680xx_f_lock(bank->target);
else{
	retval = dsp5680xx_f_unlock(bank->target);
	if (retval == ERROR_OK) {
		/* mark all as erased */
		for (int i = 0; i <= (HFM_SECTOR_COUNT-1); i++)
			/* FM does not recognize it as erased if erased via JTAG. */
			bank->sectors[i].is_erased = 1;
	}
}
  return retval;
}

/** 
 * The dsp5680xx use word addressing. The "/2" that appear in the following code are a workaround for the fact that OpenOCD uses byte addressing.
 * 
 * @param bank 
 * @param buffer Data to write to flash.
 * @param offset 
 * @param count In bytes (2 bytes per address).
 * 
 * @return 
 */
static int dsp5680xx_flash_write(struct flash_bank *bank, uint8_t *buffer, uint32_t offset, uint32_t count){
  int retval;
  if((offset + count/2)>bank->size){
    LOG_ERROR("%s: Flash bank cannot fit data.",__FUNCTION__);
    return ERROR_FAIL;
  }
  if(offset%2){
    LOG_ERROR("%s: Writing to odd addresses not supported. This chip uses word addressing, Openocd only supports byte addressing. The workaround results in disabling writing to odd byte addresses.",__FUNCTION__);
    return ERROR_FAIL;
  }
  retval = dsp5680xx_f_wr(bank->target,  buffer, bank->base + offset/2,  count, 0);
  uint32_t addr_word;
  for(addr_word = bank->base + offset/2;addr_word<count/2;addr_word+=(HFM_SECTOR_SIZE/2)){
    if(retval == ERROR_OK)
      bank->sectors[addr_word/(HFM_SECTOR_SIZE/2)].is_erased = 0;
    else
      bank->sectors[addr_word/(HFM_SECTOR_SIZE/2)].is_erased = -1;
  }
  return retval;
}

static int dsp5680xx_probe(struct flash_bank *bank){
  LOG_DEBUG("%s not implemented",__FUNCTION__);
  return ERROR_OK;
}

static int dsp5680xx_flash_info(struct flash_bank *bank, char *buf, int buf_size){
	snprintf(buf, buf_size, "\ndsp5680xx flash driver info:\n - Currently only full erase/lock/unlock are implemented. \n - Call with bank==0 and sector 0 to 0.\n - Protect requires arp_init-reset to complete. \n - Before removing protection the master tap must be selected, and arp_init-reset is required to complete unlocking.");
	return ERROR_OK;
}

/** 
 * The flash module (FM) on the dsp5680xx supports both individual sector and mass erase of the flash memory.
 * If this function is called with @first == @last == 0 or if @first is the first sector (#0) and @last is the last sector then the mass erase command is executed (much faster than erasing each sector individually).
 * 
 * @param bank 
 * @param first 
 * @param last 
 * 
 * @return 
 */
static int dsp5680xx_flash_erase(struct flash_bank * bank, int first, int last){
  int retval;
  retval = dsp5680xx_f_erase(bank->target, (uint32_t) first, (uint32_t) last);
if ((!(first|last)) || ((first == 0) && (last == (HFM_SECTOR_COUNT-1))))
	last = HFM_SECTOR_COUNT-1;
  if(retval == ERROR_OK)
    for(int i = first;i<=last;i++)
      bank->sectors[i].is_erased = 1;
  else
	// If an error occurred unknown status is set even though some sector could have been correctly erased.
    for(int i = first;i<=last;i++)
      bank->sectors[i].is_erased = -1;
  return retval;
}

/** 
 * The flash module (FM) on the dsp5680xx support a blank check function.
 * This function executes the FM's blank check functionality on each and every sector.
 * 
 * @param bank 
 * 
 * @return 
 */
static int dsp5680xx_flash_erase_check(struct flash_bank * bank){
  int retval = ERROR_OK;
  uint8_t erased = 0;
  uint32_t i;
  for(i=0;i<HFM_SECTOR_COUNT;i++){
    if(bank->sectors[i].is_erased == -1){
      retval = dsp5680xx_f_erase_check(bank->target,&erased,i);
    if (retval != ERROR_OK){
	bank->sectors[i].is_erased = -1;
    }else{
      if(erased)
	bank->sectors[i].is_erased = 1;
      else
	bank->sectors[i].is_erased = 0;
      }
    }
  }
  return retval;
}

struct flash_driver dsp5680xx_flash = {
  .name = "dsp5680xx_flash",
  .flash_bank_command = dsp5680xx_flash_bank_command,
  .erase = dsp5680xx_flash_erase,
  .protect = dsp5680xx_flash_protect,
  .write = dsp5680xx_flash_write,
  //.read = default_flash_read,
  .probe = dsp5680xx_probe,
  .auto_probe = dsp5680xx_probe,
  .erase_check = dsp5680xx_flash_erase_check,
  .protect_check = dsp5680xx_flash_protect_check,
  .info = dsp5680xx_flash_info
};
#endif // dsp5680xx_flash.h