src/flash/s3c2410_nand.c

   1 /* src/flash/s3c2410_nand.c
   2  *
   3  * S3C2410 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 s3c2410_nand_device_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc, struct nand_device_s *device);
  30 int s3c2410_init(struct nand_device_s *device);
  31 int s3c2410_read_data(struct nand_device_s *device, void *data);
  32 int s3c2410_write_data(struct nand_device_s *device, u16 data);
  33 int s3c2410_nand_ready(struct nand_device_s *device, int timeout);
  34
  35 nand_flash_controller_t s3c2410_nand_controller =
  36 {
  37         .name                   = "s3c2410",
  38         .nand_device_command    = s3c2410_nand_device_command,
  39         .register_commands      = s3c24xx_register_commands,
  40         .init                   = s3c2410_init,
  41         .reset                  = s3c24xx_reset,
  42         .command                = s3c24xx_command,
  43         .address                = s3c24xx_address,
  44         .write_data             = s3c2410_write_data,
  45         .read_data              = s3c2410_read_data,
  46         .write_page             = s3c24xx_write_page,
  47         .read_page              = s3c24xx_read_page,
  48         .controller_ready       = s3c24xx_controller_ready,
  49         .nand_ready             = s3c2410_nand_ready,
  50 };
  51
  52 int s3c2410_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 = S3C2410_NFCMD;
  65         info->addr = S3C2410_NFADDR;
  66         info->data = S3C2410_NFDATA;
  67         info->nfstat = S3C2410_NFSTAT;
  68
  69         return ERROR_OK;
  70 }
  71
  72 int s3c2410_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                          S3C2410_NFCONF_EN | S3C2410_NFCONF_TACLS(3) |
  79                          S3C2410_NFCONF_TWRPH0(5) | S3C2410_NFCONF_TWRPH1(3));
  80
  81         return ERROR_OK;
  82 }
  83
  84 int s3c2410_write_data(struct nand_device_s *device, u16 data)
  85 {
  86         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
  87         target_t *target = s3c24xx_info->target;
  88
  89         if (target->state != TARGET_HALTED) {
  90                 ERROR("target must be halted to use S3C24XX NAND flash controller");
  91                 return ERROR_NAND_OPERATION_FAILED;
  92         }
  93
  94         target_write_u32(target, S3C2410_NFDATA, data);
  95         return ERROR_OK;
  96 }
  97
  98 int s3c2410_read_data(struct nand_device_s *device, void *data)
  99 {
 100         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
 101         target_t *target = s3c24xx_info->target;
 102
 103         if (target->state != TARGET_HALTED) {
 104                 ERROR("target must be halted to use S3C24XX NAND flash controller");
 105                 return ERROR_NAND_OPERATION_FAILED;
 106         }
 107
 108         target_read_u8(target, S3C2410_NFDATA, data);
 109         return ERROR_OK;
 110 }
 111
 112 int s3c2410_nand_ready(struct nand_device_s *device, int timeout)
 113 {
 114         s3c24xx_nand_controller_t *s3c24xx_info = device->controller_priv;
 115         target_t *target = s3c24xx_info->target;
 116         u8 status;
 117
 118         if (target->state != TARGET_HALTED) {
 119                 ERROR("target must be halted to use S3C24XX NAND flash controller");
 120                 return ERROR_NAND_OPERATION_FAILED;
 121         }
 122
 123         do {
 124                 target_read_u8(target, S3C2410_NFSTAT, &status);
 125
 126                 if (status & S3C2410_NFSTAT_BUSY)
 127                         return 1;
 128
 129                 usleep(1000);
 130         } while (timeout-- > 0);
 131
 132         return 0;
 133 }