第七章之S5PV210移植到Nandflash

1,之前的操作都是基于SD卡进行运行的，如今在Nandfalsh中运行u-boot.因为s5p_goni.h配置文件没有配置Nand相关文件，所以先配置Nand文件.

在include/configs/s5p_goni.h中添加一个：#define CONFIG_CMD_NAND

2,根据board_init_r函数中nand_init()如下图:

3,进行nand_init();

4,所以配置文件还需要添加#defnie CONFIG_SYS_MAX_NAND_DEVICE  1,及其 nand基地址#define CONFIG_SYS_NAND_BASE　　0xB0E00000

5,查看common/Makefie如图：先把环境变量设成nand

6,在nand_init()中，发现drives/mtd/nand/没有相关的board_nand_init()函数.根据s3c2410修改成s5pv210nand.c:

/*************************************************************************
> File Name: s5pv210_nand.c
> Author:
> Mail:
> Created Time: Wed 09 Aug 2017 03:34:27 PM CST
************************************************************************/
/* name:Sourcelink
* (C) Copyright 2006 OpenMoko, Inc.

* Author: Harald Welte <laforge@openmoko.org>

*
* SPDX-License-Identifier: GPL-2.0+
*/

#include <common.h>

#include <nand.h>
#include <asm/arch/nand_reg.h>
#include <asm/io.h>

#define MP0_1CON (*(volatile unsigned long *)0xE02002E0)
#define MP0_3CON (*(volatile unsigned long *)0xE0200320)
#define MP0_6CON (*(volatile unsigned long *)0xE0200380)

/* Nand Flash Configuration Register */
#define AddrCycle 1 /* 5 address cycle */
#define PageSize 0 /* 2KBytes/Page */
#define MLCFlash 0 /* SLC NAND Flash */
#define TWRPH1 1 /* (0+1) * 7.5 > 5ns (tCLH/tALH) */
#define TWRPH0 2 /* (1+1) * 7.5ns > 12ns (tWP) */
#define TACLS 1 /* 7.5ns * 2 > 12ns tALS tCLS */

/* Control Register */
#define MODE 1 /* ENABLE NAND Flash Controller */
#define Reg_nCE0 1 /* Disable chip select */

/* modied by Sourcelink */
static void s5pv210_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{
struct nand_chip *chip = mtd->priv;
struct s5pv210_nand *nand = (struct s5pv210_nand *)s5pv210_get_base_nand();
debug("hwcontrol(): 0x%02x 0x%02x\n", cmd, ctrl);
ulong IO_ADDR_W = (ulong)nand;
if (ctrl & NAND_CTRL_CHANGE) {

if (ctrl & NAND_CLE)
IO_ADDR_W = IO_ADDR_W | 0x8; /* Command Register */
else if (ctrl & NAND_ALE)
IO_ADDR_W = IO_ADDR_W | 0xC; /* Address Register */

chip->IO_ADDR_W = (void *)IO_ADDR_W;

if (ctrl & NAND_NCE) /* select */
writel(readl(&nand->nfcont) & ~(1 << 1), &nand->nfcont);
else /* deselect */
writel(readl(&nand->nfcont) | (1 << 1), &nand->nfcont);
}

if (cmd != NAND_CMD_NONE)
writeb(cmd, chip->IO_ADDR_W);
else
chip->IO_ADDR_W = &nand->nfdata;

}

static int s5pv210_dev_ready(struct mtd_info *mtd)
{
struct s5pv210_nand *nand = (struct s5pv210_nand *)s5pv210_get_base_nand();
debug("dev_ready\n");
return readl(&nand->nfstat) & 0x01;
}

#ifdef CONFIG_S3C2410_NAND_HWECC
void s5pv210_nand_enable_hwecc(struct mtd_info *mtd, int mode)
{
struct s5pv210_nand *nand = (struct s5pv210_nand *)s5pv210_get_base_nand();
debug("s5pv210_nand_enable_hwecc(%p, %d)\n", mtd, mode);
writel(readl(&nand->nfconf) | S3C2410_NFCONF_INITECC, &nand->nfconf);
}

static int s5pv210_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
u_char *ecc_code)
{
struct s5pv210_nand *nand = (struct s5pv210_nand *)s5pv210_get_base_nand();
ecc_code[0] = readb(&nand->nfecc);
ecc_code[1] = readb(&nand->nfecc + 1);
ecc_code[2] = readb(&nand->nfecc + 2);
debug("s5pv210_nand_calculate_hwecc(%p,): 0x%02x 0x%02x 0x%02x\n",
mtd , ecc_code[0], ecc_code[1], ecc_code[2]);

return 0;
}

static int s5pv210_nand_correct_data(struct mtd_info *mtd, u_char *dat,
u_char *read_ecc, u_char *calc_ecc)
{
if (read_ecc[0] == calc_ecc[0] &&
read_ecc[1] == calc_ecc[1] &&
read_ecc[2] == calc_ecc[2])
return 0;

printf("s5pv210_nand_correct_data: not implemented\n");
return -1;
}
#endif

/*
* add by Sourcelink
* nand_select_chip
* @mtd: MTD device structure
* @ctl: 0 to select, -1 for deselect
*
* Default select function for 1 chip devices.
*/
static void s5pv210_nand_select_chip(struct mtd_info *mtd, int ctl)
{
struct nand_chip *chip = mtd->priv;

switch (ctl) {
case -1: /* deselect the chip */
chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
break;
case 0: /* Select the chip */
chip->cmd_ctrl(mtd, NAND_CMD_NONE, NAND_NCE | NAND_CTRL_CHANGE);
break;

default:
BUG();
}
}

/* modied by Sourcelink */
int board_nand_init(struct nand_chip *nand)
{
u32 cfg;
struct s5pv210_nand *nand_reg = (struct s5pv210_nand *)(struct s5pv210_nand *)s5pv210_get_base_nand();

debug("board_nand_init()\n");

/* initialize hardware */
/* HCLK_PSYS=133MHz(7.5ns) */
cfg = ((AddrCycle << 1) | (PageSize << 2) | (MLCFlash << 3) | (TWRPH1 << 4) | (TWRPH0 << 8) | (TACLS << 12));

writel(cfg, &nand_reg->nfconf);

writel((Reg_nCE0 << 1) | (MODE << 0), &nand_reg->nfcont);
/* Disable chip select and Enable NAND Flash Controller */

/*
* port map
* CE1-> Xm0CSn2 -> MP01_2
* CLE-> Xm0FCLE -> MP03_0
* ALE-> Xm0FALE -> MP03_1
* WE -> Xm0FWEn -> MP03_2
* RE -> Xm0FREn -> MP03_3
* R/B1->Xm0FRnB0-> MP03_4
* IO[7:0]->Xm0DATA[7:0]->MP0_6[7:0]
* */

/* 设置片选引脚 CSN[0] */
MP0_1CON &= ~(0x00000F00);
MP0_1CON |= (3 << 8);

/* CLE,ALE,WE,RE,R/B1 */
MP0_3CON &= ~(0x000FFFFF);
MP0_3CON |= 0x00022222;

/* DATA */
MP0_6CON = 0x22222222;

/* initialize nand_chip data structure */
nand->IO_ADDR_R = (void *)&nand_reg->nfdata;
nand->IO_ADDR_W = (void *)&nand_reg->nfdata;

nand->select_chip = s5pv210_nand_select_chip;

/* read_buf and write_buf are default */
/* read_byte and write_byte are default */

/* hwcontrol always must be implemented */
nand->cmd_ctrl = s5pv210_hwcontrol;

nand->dev_ready = s5pv210_dev_ready;

#ifdef CONFIG_S3C2410_NAND_HWECC
nand->ecc.hwctl = s5pv210_nand_enable_hwecc;
nand->ecc.calculate = s5pv210_nand_calculate_ecc;
nand->ecc.correct = s5pv210_nand_correct_data;
nand->ecc.mode = NAND_ECC_HW;
nand->ecc.size = CONFIG_SYS_NAND_ECCSIZE;
nand->ecc.bytes = CONFIG_SYS_NAND_ECCBYTES;
nand->ecc.strength = 1;
#else
nand->ecc.mode = NAND_ECC_SOFT;
#endif

#ifdef CONFIG_S3C2410_NAND_BBT
nand->bbt_options |= NAND_BBT_USE_FLASH;
#endif

debug("end of nand_init\n");

return 0;
}

7,在vim arch/arm/include/asm/arch-s5pc1xx/cpu.h  下添加：

在62行添加#define S5PV210_NAND_BASE       0xB0E00000

8,然后在arch/arm/include/asm/arch-s5pc1xx/下创建文件nand_reg.h，定义 NAND 的寄存器结构体

/*************************************************************************
> File Name: nand_reg.h
> Author:
> Mail:
> Created Time: Wed 09 Aug 2017 04:11:49 PM CST
************************************************************************/

#ifndef _NAND_REG_H
#define _NAND_REG_H

#ifndef __ASSEMBLY__
static inline struct s5pv210_nand *s5pv210_get_base_nand(void)
{
return (struct s5pv210_nand *)S5PV210_NAND_BASE;
}

struct s5pv210_nand {
unsigned int nfconf;
unsigned int nfcont;
unsigned int nfcmmd;
unsigned int nfaddr;
unsigned int nfdata;
unsigned int nfmeccd0;
unsigned int nfmeccd1;
unsigned int nfseccd;
unsigned int nfsblk;
unsigned int nfeblk;
unsigned int nfstat;
unsigned int nfeccerr0;
unsigned int nfeccerr1;
unsigned int nfmecc0;
unsigned int nfmecc1;
unsigned int nfsecc;
unsigned int nfmlcbitpt;
};

#endif
#endif

9,修改drivers/mtd/nand/Makefile，将s5pv210_nand.c编译进uboot

10,添加环境变量偏移量，在配置文件里添加:#define CONFIG_ENV_OFFSET,移植NAND，必需要OFFSET

11,然后，再make,生成可以移值到Nand falsh的u-boot.