git.sur5r.net Git - openocd/blob - src/flash/s3c2410_nand.c

   1 /***************************************************************************
   2  *   Copyright (C) 2007, 2008 by Ben Dooks                                 *
   3  *   ben@fluff.org                                                         *
   4  *                                                                         *
   5  *   This program is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation; either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   This program is distributed in the hope that it will be useful,       *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with this program; if not, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  19  ***************************************************************************/
  20
  21 /*
  22  * S3C2410 OpenOCD NAND Flash controller support.
  23  *
  24  * Many thanks to Simtec Electronics for sponsoring this work.
  25  */
  26
  27 #ifdef HAVE_CONFIG_H
  28 #include "config.h"
  29 #endif
  30
  31 #include "s3c24xx_nand.h"
  32
  33 static int s3c2410_nand_device_command(struct command_context_s *cmd_ctx, char *cmd,
  34                                 char **args, int argc,
  35                                 struct nand_device_s *device)
  36 {
  37         s3c24xx_nand_controller_t *info;
  38
  39         info = s3c24xx_nand_device_command(cmd_ctx, cmd, args, argc, device);
  40         if (info == NULL) {
  41                 return ERROR_NAND_DEVICE_INVALID;
  42         }
  43
  44         /* fill in the address fields for the core device */
  45         info->cmd = S3C2410_NFCMD;
  46         info->addr = S3C2410_NFADDR;
  47         info->data = S3C2410_NFDATA;
  48         info->nfstat = S3C2410_NFSTAT;
  49
  50         return ERROR_OK;
  51 }
  52
  53 static int s3c2410_init(struct nand_device_s *device)
  54 {
  55         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
  56         target_t *target = s3c24xx_info->target;
  57
  58         target_write_u32(target, S3C2410_NFCONF,
  59                          S3C2410_NFCONF_EN | S3C2410_NFCONF_TACLS(3) |
  60                          S3C2410_NFCONF_TWRPH0(5) | S3C2410_NFCONF_TWRPH1(3));
  61
  62         return ERROR_OK;
  63 }
  64
  65 static int s3c2410_write_data(struct nand_device_s *device, uint16_t data)
  66 {
  67         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
  68         target_t *target = s3c24xx_info->target;
  69
  70         if (target->state != TARGET_HALTED) {
  71                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
  72                 return ERROR_NAND_OPERATION_FAILED;
  73         }
  74
  75         target_write_u32(target, S3C2410_NFDATA, data);
  76         return ERROR_OK;
  77 }
  78
  79 static int s3c2410_read_data(struct nand_device_s *device, void *data)
  80 {
  81         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
  82         target_t *target = s3c24xx_info->target;
  83
  84         if (target->state != TARGET_HALTED) {
  85                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
  86                 return ERROR_NAND_OPERATION_FAILED;
  87         }
  88
  89         target_read_u8(target, S3C2410_NFDATA, data);
  90         return ERROR_OK;
  91 }
  92
  93 static int s3c2410_nand_ready(struct nand_device_s *device, int timeout)
  94 {
  95         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
  96         target_t *target = s3c24xx_info->target;
  97         uint8_t status;
  98
  99         if (target->state != TARGET_HALTED) {
 100                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
 101                 return ERROR_NAND_OPERATION_FAILED;
 102         }
 103
 104         do {
 105                 target_read_u8(target, S3C2410_NFSTAT, &status);
 106
 107                 if (status & S3C2410_NFSTAT_BUSY)
 108                         return 1;
 109
 110                 alive_sleep(1);
 111         } while (timeout-- > 0);
 112
 113         return 0;
 114 }
 115
 116 nand_flash_controller_t s3c2410_nand_controller = {
 117                 .name = "s3c2410",
 118                 .nand_device_command = &s3c2410_nand_device_command,
 119                 .register_commands = &s3c24xx_register_commands,
 120                 .init = &s3c2410_init,
 121                 .reset = &s3c24xx_reset,
 122                 .command = &s3c24xx_command,
 123                 .address = &s3c24xx_address,
 124                 .write_data = &s3c2410_write_data,
 125                 .read_data = &s3c2410_read_data,
 126                 .write_page = s3c24xx_write_page,
 127                 .read_page = s3c24xx_read_page,
 128                 .controller_ready = &s3c24xx_controller_ready,
 129                 .nand_ready = &s3c2410_nand_ready,
 130         };