s3c2440.c

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// SPDX-License-Identifier: GPL-2.0-or-later
 
/***************************************************************************
 *   Copyright (C) 2007, 2008 by Ben Dooks                                 *
 *   ben@fluff.org                                                         *
 ***************************************************************************/
 
/*
 * S3C2440 OpenOCD NAND Flash controller support.
 *
 * Many thanks to Simtec Electronics for sponsoring this work.
 */
 
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
 
#include "s3c24xx.h"
 
NAND_DEVICE_COMMAND_HANDLER(s3c2440_nand_device_command)
{
    struct s3c24xx_nand_controller *info;
    CALL_S3C24XX_DEVICE_COMMAND(nand, &info);
 
    /* fill in the address fields for the core device */
    info->cmd = S3C2440_NFCMD;
    info->addr = S3C2440_NFADDR;
    info->data = S3C2440_NFDATA;
    info->nfstat = S3C2440_NFSTAT;
 
    return ERROR_OK;
}
 
static int s3c2440_init(struct nand_device *nand)
{
    struct target *target = nand->target;
 
    target_write_u32(target, S3C2410_NFCONF,
             S3C2440_NFCONF_TACLS(3) |
             S3C2440_NFCONF_TWRPH0(7) |
             S3C2440_NFCONF_TWRPH1(7));
 
    target_write_u32(target, S3C2440_NFCONT,
             S3C2440_NFCONT_INITECC | S3C2440_NFCONT_ENABLE);
 
    return ERROR_OK;
}
 
int s3c2440_nand_ready(struct nand_device *nand, int timeout)
{
    struct s3c24xx_nand_controller *s3c24xx_info = nand->controller_priv;
    struct target *target = nand->target;
    uint8_t status;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    do {
        target_read_u8(target, s3c24xx_info->nfstat, &status);
 
        if (status & S3C2440_NFSTAT_READY)
            return 1;
 
        alive_sleep(1);
    } while (timeout-- > 0);
 
 
    return 0;
}
 
/* use the fact we can read/write 4 bytes in one go via a single 32bit op */
 
int s3c2440_read_block_data(struct nand_device *nand, uint8_t *data, int data_size)
{
    struct s3c24xx_nand_controller *s3c24xx_info = nand->controller_priv;
    struct target *target = nand->target;
    uint32_t nfdata = s3c24xx_info->data;
    uint32_t tmp;
 
    LOG_INFO("%s: reading data: %p, %p, %d", __func__, nand, data, data_size);
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    while (data_size >= 4) {
        target_read_u32(target, nfdata, &tmp);
 
        data[0] = tmp;
        data[1] = tmp >> 8;
        data[2] = tmp >> 16;
        data[3] = tmp >> 24;
 
        data_size -= 4;
        data += 4;
    }
 
    while (data_size > 0) {
        target_read_u8(target, nfdata, data);
 
        data_size -= 1;
        data += 1;
    }
 
    return ERROR_OK;
}
 
int s3c2440_write_block_data(struct nand_device *nand, uint8_t *data, int data_size)
{
    struct s3c24xx_nand_controller *s3c24xx_info = nand->controller_priv;
    struct target *target = nand->target;
    uint32_t nfdata = s3c24xx_info->data;
    uint32_t tmp;
 
    if (target->state != TARGET_HALTED) {
        LOG_ERROR("target must be halted to use S3C24XX NAND flash controller");
        return ERROR_NAND_OPERATION_FAILED;
    }
 
    while (data_size >= 4) {
        tmp = le_to_h_u32(data);
        target_write_u32(target, nfdata, tmp);
 
        data_size -= 4;
        data += 4;
    }
 
    while (data_size > 0) {
        target_write_u8(target, nfdata, *data);
 
        data_size -= 1;
        data += 1;
    }
 
    return ERROR_OK;
}
 
struct nand_flash_controller s3c2440_nand_controller = {
    .name = "s3c2440",
    .nand_device_command = &s3c2440_nand_device_command,
    .init = &s3c2440_init,
    .reset = &s3c24xx_reset,
    .command = &s3c24xx_command,
    .address = &s3c24xx_address,
    .write_data = &s3c24xx_write_data,
    .read_data = &s3c24xx_read_data,
    .write_page = s3c24xx_write_page,
    .read_page = s3c24xx_read_page,
    .write_block_data = &s3c2440_write_block_data,
    .read_block_data = &s3c2440_read_block_data,
    .nand_ready = &s3c2440_nand_ready,
};