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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, write to the                         *
  17  *   Free Software Foundation, Inc.,                                       *
  18  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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.h"
  32
  33 NAND_DEVICE_COMMAND_HANDLER(s3c2410_nand_device_command)
  34 {
  35         struct s3c24xx_nand_controller *info;
  36         CALL_S3C24XX_DEVICE_COMMAND(nand, &info);
  37
  38         /* fill in the address fields for the core device */
  39         info->cmd = S3C2410_NFCMD;
  40         info->addr = S3C2410_NFADDR;
  41         info->data = S3C2410_NFDATA;
  42         info->nfstat = S3C2410_NFSTAT;
  43
  44         return ERROR_OK;
  45 }
  46
  47 static int s3c2410_init(struct nand_device *nand)
  48 {
  49         struct target *target = nand->target;
  50
  51         target_write_u32(target, S3C2410_NFCONF,
  52                          S3C2410_NFCONF_EN | S3C2410_NFCONF_TACLS(3) |
  53                          S3C2410_NFCONF_TWRPH0(5) | S3C2410_NFCONF_TWRPH1(3));
  54
  55         return ERROR_OK;
  56 }
  57
  58 static int s3c2410_write_data(struct nand_device *nand, uint16_t data)
  59 {
  60         struct target *target = nand->target;
  61
  62         if (target->state != TARGET_HALTED) {
  63                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
  64                 return ERROR_NAND_OPERATION_FAILED;
  65         }
  66
  67         target_write_u32(target, S3C2410_NFDATA, data);
  68         return ERROR_OK;
  69 }
  70
  71 static int s3c2410_read_data(struct nand_device *nand, void *data)
  72 {
  73         struct target *target = nand->target;
  74
  75         if (target->state != TARGET_HALTED) {
  76                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
  77                 return ERROR_NAND_OPERATION_FAILED;
  78         }
  79
  80         target_read_u8(target, S3C2410_NFDATA, data);
  81         return ERROR_OK;
  82 }
  83
  84 static int s3c2410_nand_ready(struct nand_device *nand, int timeout)
  85 {
  86         struct target *target = nand->target;
  87         uint8_t status;
  88
  89         if (target->state != TARGET_HALTED) {
  90                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
  91                 return ERROR_NAND_OPERATION_FAILED;
  92         }
  93
  94         do {
  95                 target_read_u8(target, S3C2410_NFSTAT, &status);
  96
  97                 if (status & S3C2410_NFSTAT_BUSY)
  98                         return 1;
  99
 100                 alive_sleep(1);
 101         } while (timeout-- > 0);
 102
 103         return 0;
 104 }
 105
 106 struct nand_flash_controller s3c2410_nand_controller = {
 107         .name = "s3c2410",
 108         .nand_device_command = &s3c2410_nand_device_command,
 109         .init = &s3c2410_init,
 110         .reset = &s3c24xx_reset,
 111         .command = &s3c24xx_command,
 112         .address = &s3c24xx_address,
 113         .write_data = &s3c2410_write_data,
 114         .read_data = &s3c2410_read_data,
 115         .write_page = s3c24xx_write_page,
 116         .read_page = s3c24xx_read_page,
 117         .nand_ready = &s3c2410_nand_ready,
 118 };