src/flash/s3c2440_nand.c

   1 /* src/flash/s3c2440_nand.c
   2  *
   3  * S3C2440 OpenOCD NAND Flash controller support.
   4  *
   5  * Copyright 2007,2008 Ben Dooks <ben@fluff.org>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * Many thanks to Simtec Electronics for sponsoring this work.
  13  */
  14
  15 #ifdef HAVE_CONFIG_H
  16 #include "config.h"
  17 #endif
  18
  19 #include "replacements.h"
  20 #include "log.h"
  21
  22 #include <stdlib.h>
  23 #include <string.h>
  24
  25 #include "nand.h"
  26 #include "s3c24xx_nand.h"
  27 #include "target.h"
  28
  29 int s3c2440_nand_device_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct nand_device_s *device);
  30 int s3c2440_init(struct nand_device_s *device);
  31 int s3c2440_nand_ready(struct nand_device_s *device, int timeout);
  32
  33 nand_flash_controller_t s3c2440_nand_controller =
  34 {
  35         .name                   = "s3c2440",
  36         .nand_device_command    = s3c2440_nand_device_command,
  37         .register_commands      = s3c24xx_register_commands,
  38         .init                   = s3c2440_init,
  39         .reset                  = s3c24xx_reset,
  40         .command                = s3c24xx_command,
  41         .address                = s3c24xx_address,
  42         .write_data             = s3c24xx_write_data,
  43         .read_data              = s3c24xx_read_data,
  44         .write_page             = s3c24xx_write_page,
  45         .read_page              = s3c24xx_read_page,
  46         .write_block_data       = s3c2440_write_block_data,
  47         .read_block_data        = s3c2440_read_block_data,
  48         .controller_ready       = s3c24xx_controller_ready,
  49         .nand_ready             = s3c2440_nand_ready,
  50 };
  51
  52 int s3c2440_nand_device_command(struct command_context_s *cmd_ctx, char *cmd,
  53                                 char **args, int argc,
  54                                 struct nand_device_s *device)
  55 {
  56         s3c24xx_nand_controller_t *info;
  57
  58         info = s3c24xx_nand_device_command(cmd_ctx, cmd, args, argc, device);
  59         if (info == NULL) {
  60                 return ERROR_NAND_DEVICE_INVALID;
  61         }
  62
  63         /* fill in the address fields for the core device */
  64         info->cmd = S3C2440_NFCMD;
  65         info->addr = S3C2440_NFADDR;
  66         info->data = S3C2440_NFDATA;
  67         info->nfstat = S3C2440_NFSTAT;
  68
  69         return ERROR_OK;
  70 }
  71
  72 int s3c2440_init(struct nand_device_s *device)
  73 {
  74         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
  75         target_t *target = s3c24xx_info->target;
  76
  77         target_write_u32(target, S3C2410_NFCONF,
  78                          S3C2440_NFCONF_TACLS(3) |
  79                          S3C2440_NFCONF_TWRPH0(7) |
  80                          S3C2440_NFCONF_TWRPH1(7));
  81
  82         target_write_u32(target, S3C2440_NFCONT,
  83                          S3C2440_NFCONT_INITECC | S3C2440_NFCONT_ENABLE);
  84
  85         return ERROR_OK;
  86 }
  87
  88 int s3c2440_nand_ready(struct nand_device_s *device, int timeout)
  89 {
  90         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
  91         target_t *target = s3c24xx_info->target;
  92         u8 status;
  93
  94         if (target->state != TARGET_HALTED) {
  95                 ERROR("target must be halted to use S3C24XX NAND flash controller");
  96                 return ERROR_NAND_OPERATION_FAILED;
  97         }
  98
  99         do {
 100                 target_read_u8(target, s3c24xx_info->nfstat, &status);
 101
 102                 if (status & S3C2440_NFSTAT_READY)
 103                         return 1;
 104
 105                 usleep(1000);
 106         } while (timeout-- > 0);
 107
 108
 109         return 0;
 110 }
 111
 112 /* use the fact we can read/write 4 bytes in one go via a single 32bit op */
 113
 114 int s3c2440_read_block_data(struct nand_device_s *device, u8 *data, int data_size)
 115 {
 116         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
 117         target_t *target = s3c24xx_info->target;
 118         u32 nfdata = s3c24xx_info->data;
 119         u32 tmp;
 120
 121         INFO("%s: reading data: %p, %p, %d\n", __func__, device, data, data_size);
 122
 123         if (target->state != TARGET_HALTED) {
 124                 ERROR("target must be halted to use S3C24XX NAND flash controller");
 125                 return ERROR_NAND_OPERATION_FAILED;
 126         }
 127
 128         while (data_size >= 4) {
 129                 target_read_u32(target, nfdata, &tmp);
 130
 131                 data[0] = tmp;
 132                 data[1] = tmp >> 8;
 133                 data[2] = tmp >> 16;
 134                 data[3] = tmp >> 24;
 135
 136                 data_size -= 4;
 137                 data += 4;
 138         }
 139
 140         while (data_size > 0) {
 141                 target_read_u8(target, nfdata, data);
 142
 143                 data_size -= 1;
 144                 data += 1;
 145         }
 146
 147         return ERROR_OK;
 148 }
 149
 150 int s3c2440_write_block_data(struct nand_device_s *device, u8 *data, int data_size)
 151 {
 152         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
 153         target_t *target = s3c24xx_info->target;
 154         u32 nfdata = s3c24xx_info->data;
 155         u32 tmp;
 156
 157         if (target->state != TARGET_HALTED) {
 158                 ERROR("target must be halted to use S3C24XX NAND flash controller");
 159                 return ERROR_NAND_OPERATION_FAILED;
 160         }
 161
 162         while (data_size >= 4) {
 163                 tmp = le_to_h_u32(data);
 164                 target_write_u32(target, nfdata, tmp);
 165
 166                 data_size -= 4;
 167                 data += 4;
 168         }
 169
 170         while (data_size > 0) {
 171                 target_write_u8(target, nfdata, *data);
 172
 173                 data_size -= 1;
 174                 data += 1;
 175         }
 176
 177         return ERROR_OK;
 178 }