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 "replacements.h"
  32 #include "log.h"
  33
  34 #include <stdlib.h>
  35 #include <string.h>
  36
  37 #include "nand.h"
  38 #include "s3c24xx_nand.h"
  39 #include "target.h"
  40
  41 int s3c2410_nand_device_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct nand_device_s *device);
  42 int s3c2410_init(struct nand_device_s *device);
  43 int s3c2410_read_data(struct nand_device_s *device, void *data);
  44 int s3c2410_write_data(struct nand_device_s *device, u16 data);
  45 int s3c2410_nand_ready(struct nand_device_s *device, int timeout);
  46
  47 nand_flash_controller_t s3c2410_nand_controller =
  48 {
  49         .name                   = "s3c2410",
  50         .nand_device_command    = s3c2410_nand_device_command,
  51         .register_commands      = s3c24xx_register_commands,
  52         .init                   = s3c2410_init,
  53         .reset                  = s3c24xx_reset,
  54         .command                = s3c24xx_command,
  55         .address                = s3c24xx_address,
  56         .write_data             = s3c2410_write_data,
  57         .read_data              = s3c2410_read_data,
  58         .write_page             = s3c24xx_write_page,
  59         .read_page              = s3c24xx_read_page,
  60         .controller_ready       = s3c24xx_controller_ready,
  61         .nand_ready             = s3c2410_nand_ready,
  62 };
  63
  64 int s3c2410_nand_device_command(struct command_context_s *cmd_ctx, char *cmd,
  65                                 char **args, int argc,
  66                                 struct nand_device_s *device)
  67 {
  68         s3c24xx_nand_controller_t *info;
  69
  70         info = s3c24xx_nand_device_command(cmd_ctx, cmd, args, argc, device);
  71         if (info == NULL) {
  72                 return ERROR_NAND_DEVICE_INVALID;
  73         }
  74
  75         /* fill in the address fields for the core device */
  76         info->cmd = S3C2410_NFCMD;
  77         info->addr = S3C2410_NFADDR;
  78         info->data = S3C2410_NFDATA;
  79         info->nfstat = S3C2410_NFSTAT;
  80
  81         return ERROR_OK;
  82 }
  83
  84 int s3c2410_init(struct nand_device_s *device)
  85 {
  86         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
  87         target_t *target = s3c24xx_info->target;
  88
  89         target_write_u32(target, S3C2410_NFCONF,
  90                          S3C2410_NFCONF_EN | S3C2410_NFCONF_TACLS(3) |
  91                          S3C2410_NFCONF_TWRPH0(5) | S3C2410_NFCONF_TWRPH1(3));
  92
  93         return ERROR_OK;
  94 }
  95
  96 int s3c2410_write_data(struct nand_device_s *device, u16 data)
  97 {
  98         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
  99         target_t *target = s3c24xx_info->target;
 100
 101         if (target->state != TARGET_HALTED) {
 102                 ERROR("target must be halted to use S3C24XX NAND flash controller");
 103                 return ERROR_NAND_OPERATION_FAILED;
 104         }
 105
 106         target_write_u32(target, S3C2410_NFDATA, data);
 107         return ERROR_OK;
 108 }
 109
 110 int s3c2410_read_data(struct nand_device_s *device, void *data)
 111 {
 112         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
 113         target_t *target = s3c24xx_info->target;
 114
 115         if (target->state != TARGET_HALTED) {
 116                 ERROR("target must be halted to use S3C24XX NAND flash controller");
 117                 return ERROR_NAND_OPERATION_FAILED;
 118         }
 119
 120         target_read_u8(target, S3C2410_NFDATA, data);
 121         return ERROR_OK;
 122 }
 123
 124 int s3c2410_nand_ready(struct nand_device_s *device, int timeout)
 125 {
 126         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
 127         target_t *target = s3c24xx_info->target;
 128         u8 status;
 129
 130         if (target->state != TARGET_HALTED) {
 131                 ERROR("target must be halted to use S3C24XX NAND flash controller");
 132                 return ERROR_NAND_OPERATION_FAILED;
 133         }
 134
 135         do {
 136                 target_read_u8(target, S3C2410_NFSTAT, &status);
 137
 138                 if (status & S3C2410_NFSTAT_BUSY)
 139                         return 1;
 140
 141                 usleep(1000);
 142         } while (timeout-- > 0);
 143
 144         return 0;
 145 }