src/flash/nand/s3c2440.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  * S3C2440 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
  34 NAND_DEVICE_COMMAND_HANDLER(s3c2440_nand_device_command)
  35 {
  36         struct s3c24xx_nand_controller *info;
  37         CALL_S3C24XX_DEVICE_COMMAND(nand, &info);
  38
  39         /* fill in the address fields for the core device */
  40         info->cmd = S3C2440_NFCMD;
  41         info->addr = S3C2440_NFADDR;
  42         info->data = S3C2440_NFDATA;
  43         info->nfstat = S3C2440_NFSTAT;
  44
  45         return ERROR_OK;
  46 }
  47
  48 static int s3c2440_init(struct nand_device *nand)
  49 {
  50         struct s3c24xx_nand_controller *s3c24xx_info = nand->controller_priv;
  51         struct target *target = s3c24xx_info->target;
  52
  53         target_write_u32(target, S3C2410_NFCONF,
  54                          S3C2440_NFCONF_TACLS(3) |
  55                          S3C2440_NFCONF_TWRPH0(7) |
  56                          S3C2440_NFCONF_TWRPH1(7));
  57
  58         target_write_u32(target, S3C2440_NFCONT,
  59                          S3C2440_NFCONT_INITECC | S3C2440_NFCONT_ENABLE);
  60
  61         return ERROR_OK;
  62 }
  63
  64 int s3c2440_nand_ready(struct nand_device *nand, int timeout)
  65 {
  66         struct s3c24xx_nand_controller *s3c24xx_info = nand->controller_priv;
  67         struct target *target = s3c24xx_info->target;
  68         uint8_t status;
  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         do {
  76                 target_read_u8(target, s3c24xx_info->nfstat, &status);
  77
  78                 if (status & S3C2440_NFSTAT_READY)
  79                         return 1;
  80
  81                 alive_sleep(1);
  82         } while (timeout-- > 0);
  83
  84
  85         return 0;
  86 }
  87
  88 /* use the fact we can read/write 4 bytes in one go via a single 32bit op */
  89
  90 int s3c2440_read_block_data(struct nand_device *nand, uint8_t *data, int data_size)
  91 {
  92         struct s3c24xx_nand_controller *s3c24xx_info = nand->controller_priv;
  93         struct target *target = s3c24xx_info->target;
  94         uint32_t nfdata = s3c24xx_info->data;
  95         uint32_t tmp;
  96
  97         LOG_INFO("%s: reading data: %p, %p, %d\n", __func__, nand, data, data_size);
  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         while (data_size >= 4) {
 105                 target_read_u32(target, nfdata, &tmp);
 106
 107                 data[0] = tmp;
 108                 data[1] = tmp >> 8;
 109                 data[2] = tmp >> 16;
 110                 data[3] = tmp >> 24;
 111
 112                 data_size -= 4;
 113                 data += 4;
 114         }
 115
 116         while (data_size > 0) {
 117                 target_read_u8(target, nfdata, data);
 118
 119                 data_size -= 1;
 120                 data += 1;
 121         }
 122
 123         return ERROR_OK;
 124 }
 125
 126 int s3c2440_write_block_data(struct nand_device *nand, uint8_t *data, int data_size)
 127 {
 128         struct s3c24xx_nand_controller *s3c24xx_info = nand->controller_priv;
 129         struct target *target = s3c24xx_info->target;
 130         uint32_t nfdata = s3c24xx_info->data;
 131         uint32_t tmp;
 132
 133         if (target->state != TARGET_HALTED) {
 134                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
 135                 return ERROR_NAND_OPERATION_FAILED;
 136         }
 137
 138         while (data_size >= 4) {
 139                 tmp = le_to_h_u32(data);
 140                 target_write_u32(target, nfdata, tmp);
 141
 142                 data_size -= 4;
 143                 data += 4;
 144         }
 145
 146         while (data_size > 0) {
 147                 target_write_u8(target, nfdata, *data);
 148
 149                 data_size -= 1;
 150                 data += 1;
 151         }
 152
 153         return ERROR_OK;
 154 }
 155
 156 struct nand_flash_controller s3c2440_nand_controller = {
 157                 .name = "s3c2440",
 158                 .nand_device_command = &s3c2440_nand_device_command,
 159                 .init = &s3c2440_init,
 160                 .reset = &s3c24xx_reset,
 161                 .command = &s3c24xx_command,
 162                 .address = &s3c24xx_address,
 163                 .write_data = &s3c24xx_write_data,
 164                 .read_data = &s3c24xx_read_data,
 165                 .write_page = s3c24xx_write_page,
 166                 .read_page = s3c24xx_read_page,
 167                 .write_block_data = &s3c2440_write_block_data,
 168                 .read_block_data = &s3c2440_read_block_data,
 169                 .controller_ready = &s3c24xx_controller_ready,
 170                 .nand_ready = &s3c2440_nand_ready,
 171         };