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   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, see <http://www.gnu.org/licenses/>. *
  17  ***************************************************************************/
  18
  19 /*
  20  * S3C2410 OpenOCD NAND Flash controller support.
  21  *
  22  * Many thanks to Simtec Electronics for sponsoring this work.
  23  */
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include "s3c24xx.h"
  30
  31 NAND_DEVICE_COMMAND_HANDLER(s3c2410_nand_device_command)
  32 {
  33         struct s3c24xx_nand_controller *info;
  34         CALL_S3C24XX_DEVICE_COMMAND(nand, &info);
  35
  36         /* fill in the address fields for the core device */
  37         info->cmd = S3C2410_NFCMD;
  38         info->addr = S3C2410_NFADDR;
  39         info->data = S3C2410_NFDATA;
  40         info->nfstat = S3C2410_NFSTAT;
  41
  42         return ERROR_OK;
  43 }
  44
  45 static int s3c2410_init(struct nand_device *nand)
  46 {
  47         struct target *target = nand->target;
  48
  49         target_write_u32(target, S3C2410_NFCONF,
  50                          S3C2410_NFCONF_EN | S3C2410_NFCONF_TACLS(3) |
  51                          S3C2410_NFCONF_TWRPH0(5) | S3C2410_NFCONF_TWRPH1(3));
  52
  53         return ERROR_OK;
  54 }
  55
  56 static int s3c2410_write_data(struct nand_device *nand, uint16_t data)
  57 {
  58         struct target *target = nand->target;
  59
  60         if (target->state != TARGET_HALTED) {
  61                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
  62                 return ERROR_NAND_OPERATION_FAILED;
  63         }
  64
  65         target_write_u32(target, S3C2410_NFDATA, data);
  66         return ERROR_OK;
  67 }
  68
  69 static int s3c2410_read_data(struct nand_device *nand, void *data)
  70 {
  71         struct target *target = nand->target;
  72
  73         if (target->state != TARGET_HALTED) {
  74                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
  75                 return ERROR_NAND_OPERATION_FAILED;
  76         }
  77
  78         target_read_u8(target, S3C2410_NFDATA, data);
  79         return ERROR_OK;
  80 }
  81
  82 static int s3c2410_nand_ready(struct nand_device *nand, int timeout)
  83 {
  84         struct target *target = nand->target;
  85         uint8_t status;
  86
  87         if (target->state != TARGET_HALTED) {
  88                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
  89                 return ERROR_NAND_OPERATION_FAILED;
  90         }
  91
  92         do {
  93                 target_read_u8(target, S3C2410_NFSTAT, &status);
  94
  95                 if (status & S3C2410_NFSTAT_BUSY)
  96                         return 1;
  97
  98                 alive_sleep(1);
  99         } while (timeout-- > 0);
 100
 101         return 0;
 102 }
 103
 104 struct nand_flash_controller s3c2410_nand_controller = {
 105         .name = "s3c2410",
 106         .nand_device_command = &s3c2410_nand_device_command,
 107         .init = &s3c2410_init,
 108         .reset = &s3c24xx_reset,
 109         .command = &s3c24xx_command,
 110         .address = &s3c24xx_address,
 111         .write_data = &s3c2410_write_data,
 112         .read_data = &s3c2410_read_data,
 113         .write_page = s3c24xx_write_page,
 114         .read_page = s3c24xx_read_page,
 115         .nand_ready = &s3c2410_nand_ready,
 116 };