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   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2
   3 /***************************************************************************
   4  *   Copyright (C) 2007, 2008 by Ben Dooks                                 *
   5  *   ben@fluff.org                                                         *
   6  ***************************************************************************/
   7
   8 /*
   9  * S3C2410 OpenOCD NAND Flash controller support.
  10  *
  11  * Many thanks to Simtec Electronics for sponsoring this work.
  12  */
  13
  14 #ifdef HAVE_CONFIG_H
  15 #include "config.h"
  16 #endif
  17
  18 #include "s3c24xx.h"
  19
  20 NAND_DEVICE_COMMAND_HANDLER(s3c2410_nand_device_command)
  21 {
  22         struct s3c24xx_nand_controller *info;
  23         CALL_S3C24XX_DEVICE_COMMAND(nand, &info);
  24
  25         /* fill in the address fields for the core device */
  26         info->cmd = S3C2410_NFCMD;
  27         info->addr = S3C2410_NFADDR;
  28         info->data = S3C2410_NFDATA;
  29         info->nfstat = S3C2410_NFSTAT;
  30
  31         return ERROR_OK;
  32 }
  33
  34 static int s3c2410_init(struct nand_device *nand)
  35 {
  36         struct target *target = nand->target;
  37
  38         target_write_u32(target, S3C2410_NFCONF,
  39                          S3C2410_NFCONF_EN | S3C2410_NFCONF_TACLS(3) |
  40                          S3C2410_NFCONF_TWRPH0(5) | S3C2410_NFCONF_TWRPH1(3));
  41
  42         return ERROR_OK;
  43 }
  44
  45 static int s3c2410_write_data(struct nand_device *nand, uint16_t data)
  46 {
  47         struct target *target = nand->target;
  48
  49         if (target->state != TARGET_HALTED) {
  50                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
  51                 return ERROR_NAND_OPERATION_FAILED;
  52         }
  53
  54         target_write_u32(target, S3C2410_NFDATA, data);
  55         return ERROR_OK;
  56 }
  57
  58 static int s3c2410_read_data(struct nand_device *nand, void *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_read_u8(target, S3C2410_NFDATA, data);
  68         return ERROR_OK;
  69 }
  70
  71 static int s3c2410_nand_ready(struct nand_device *nand, int timeout)
  72 {
  73         struct target *target = nand->target;
  74         uint8_t status;
  75
  76         if (target->state != TARGET_HALTED) {
  77                 LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
  78                 return ERROR_NAND_OPERATION_FAILED;
  79         }
  80
  81         do {
  82                 target_read_u8(target, S3C2410_NFSTAT, &status);
  83
  84                 if (status & S3C2410_NFSTAT_BUSY)
  85                         return 1;
  86
  87                 alive_sleep(1);
  88         } while (timeout-- > 0);
  89
  90         return 0;
  91 }
  92
  93 struct nand_flash_controller s3c2410_nand_controller = {
  94         .name = "s3c2410",
  95         .nand_device_command = &s3c2410_nand_device_command,
  96         .init = &s3c2410_init,
  97         .reset = &s3c24xx_reset,
  98         .command = &s3c24xx_command,
  99         .address = &s3c24xx_address,
 100         .write_data = &s3c2410_write_data,
 101         .read_data = &s3c2410_read_data,
 102         .write_page = s3c24xx_write_page,
 103         .read_page = s3c24xx_read_page,
 104         .nand_ready = &s3c2410_nand_ready,
 105 };