Device Tree（七）NAND FLASH

1、添加设备节点

2、添加分区信息

3、添加nand驱动文件编译选项

Louis_nand.h

#ifndef __LINUX210_NAND_H
#define __LINUX210_NAND_H#define S5P_NFCONF         0x00
#define S5P_NFCONT          0x04
#define S5P_NFCMD           0x08
#define S5P_NFADDR          0x0c
#define S5P_NFDATA          0x10
#define S5P_NFMECCDATA0     0x14
#define S5P_NFMECCDATA1     0x18
#define S5P_NFSECCDATA      0x1c
#define S5P_NFSBLK          0x20
#define S5P_NFEBLK          0x24
#define S5P_NFSTAT          0x28
#define S5P_NFMECCERR0      0x2c
#define S5P_NFMECCERR1      0x30
#define S5P_NFMECC0         0x34
#define S5P_NFMECC1         0x38
#define S5P_NFSECC          0x3c
#define S5P_NFMLCBITPT      0x40
#define S5P_NF8ECCERR0      0x44
#define S5P_NF8ECCERR1      0x48
#define S5P_NF8ECCERR2      0x4C
#define S5P_NFM8ECC0        0x50
#define S5P_NFM8ECC1        0x54
#define S5P_NFM8ECC2        0x58
#define S5P_NFM8ECC3        0x5C
#define S5P_NFMLC8BITPT0    0x60
#define S5P_NFMLC8BITPT1    0x64#define S5P_NFECCCONF       0x00
#define S5P_NFECCCONT       0x20
#define S5P_NFECCSTAT       0x30
#define S5P_NFECCSECSTAT    0x40
#define S5P_NFECCPRGECC     0x90
#define S5P_NFECCERL        0xC0
#define S5P_NFECCERP        0xF0#define S5P_NFCONF_NANDBOOT     (1 << 31)
#define S5P_NFCONF_ECCCLKCON    (1 << 30)
#define S5P_NFCONF_ECC_MLC      (1 << 24)
#define S5P_NFCONF_ECC_1BIT     (0 << 23)
#define S5P_NFCONF_ECC_4BIT     (2 << 23)
#define S5P_NFCONF_ECC_8BIT     (1 << 23)
#define S5P_NFCONF_TACLS(x)     ((x) << 12)
#define S5P_NFCONF_TWRPH0(x)    ((x) << 8)
#define S5P_NFCONF_TWRPH1(x)    ((x) << 4)
#define S5P_NFCONF_MLC          (1 << 3)
#define S5P_NFCONF_PAGESIZE     (1 << 2)
#define S5P_NFCONF_ADDRCYCLE    (1 << 1)
#define S5P_NFCONF_BUSWIDTH     (1 << 0)#define S5P_NFCONT_ECC_ENC        (1 << 18)
#define S5P_NFCONT_LOCKTGHT     (1 << 17)
#define S5P_NFCONT_LOCKSOFT     (1 << 16)
#define S5P_NFCONT_MECCLOCK     (1 << 7)
#define S5P_NFCONT_SECCLOCK     (1 << 6)
#define S5P_NFCONT_INITMECC     (1 << 5)
#define S5P_NFCONT_INITSECC     (1 << 4)
#define S5P_NFCONT_nFCE1        (1 << 2)
#define S5P_NFCONT_nFCE0        (1 << 1)
#define S5P_NFCONT_MODE         (1 << 0)#define S5P_NFSTAT_READY      (1 << 0)#define S5P_NFECCCONT_MECCRESET   (1 << 0)
#define S5P_NFECCCONT_MECCINIT  (1 << 2)
#define S5P_NFECCCONT_ECCDIRWR  (1 << 16)#define S5P_NFECCSTAT_ECCBUSY    (1 << 31)enum Louis_cpu_type {TYPE_LOUIS210,
};struct Louis_nand_host {struct nand_chip    nand_chip;      //硬件操作函数集合void __iomem        *nf_base;       //寄存器基地址void __iomem        *ecc_base;      //ECC基地址struct clk          *clk[2];        //时钟enum  Louis_cpu_type    cpu_type;   //CPU类型
};#endif

Louis_nand.c

/** Copyright (c) 2018 LouisGou <LouisGou@gmail.com>** This program is free software; you can redistribute it and/or modify* it under the terms of the GNU General Public License version 2 as* published by the Free Software Foundation.** Louis MTD NAND driver
*/#include <linux/module.h>
#include <linux/delay.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/ioport.h>
#include <linux/of_platform.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/jiffies.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/io.h>#include <linux/mtd/mtd.h>
#include <linux/mtd/nand.h>
#include <linux/mtd/rawnand.h>
#include <linux/mtd/nand_ecc.h>
#include <linux/mtd/partitions.h>
#include "Louis210_nand.h"/* 用于检查设备就绪状态 */
static int Louis_nand_device_ready(struct mtd_info *mtd)
{struct nand_chip *nand_chip = mtd->priv;struct Louis_nand_host *host = nand_chip->priv;/* it's to check the RnB nand signal bit and* return to device ready condition in nand_base.c*///return "NFSTAT的寄存器[0] Flash_RnB";return readl(host->nf_base + S5P_NFSTAT) & S5P_NFSTAT_READY;
}/* 命令控制函数 */
static void Louis_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
{struct nand_chip *nand_chip = mtd->priv;struct Louis_nand_host *host = nand_chip->priv;if (cmd == NAND_CMD_NONE)return;if (ctrl & NAND_CLE){/* 发命令: NFCMMD = dat */writeb(cmd, host->nf_base + S5P_NFCMD);}else{/* 发地址: NFADDR = dat */writeb(cmd, host->nf_base + S5P_NFADDR);}
}/*片选函数*/
static void Louis_nand_select_chip(struct mtd_info *mtd, int chip)
{struct nand_chip *nand_chip = mtd->priv;struct Louis_nand_host *host = nand_chip->priv;u32 value = readl(host->nf_base + S5P_NFCONT);if(chip == -1){/* 取消选中: NFCONT[1]设为1 */value |= S5P_NFCONT_nFCE0; /* deselect */}else{/* 选中: NFCONT[1]设为0 */value &= ~S5P_NFCONT_nFCE0;  /* select */}writel(value, host->nf_base + S5P_NFCONT);
}    static void Louis_nand_inithw_later(struct mtd_info *mtd)
{struct nand_chip *nand_chip = mtd->priv;struct Louis_nand_host *host = nand_chip->priv;u32 value;value = readl(host->nf_base + S5P_NFCONF);if(nand_is_slc(nand_chip)){value &= ~S5P_NFCONF_MLC;if(mtd->writesize == 512){value |= S5P_NFCONF_PAGESIZE;} else  {value &= ~S5P_NFCONF_PAGESIZE;}} else {value |= S5P_NFCONF_MLC;if(mtd->writesize == 4096){value &= ~S5P_NFCONF_PAGESIZE;} else  {value |= S5P_NFCONF_PAGESIZE;}}
}static void Louis_nand_inithw(struct Louis_nand_host *host)
{u32 value;//使能NAND控制value = readl(host->nf_base + S5P_NFCONT);writel(value | S5P_NFCONT_MODE, host->nf_base + S5P_NFCONT);
}static void Louis_nand_parse_dt(struct Louis_nand_host *host, struct device *dev)
{host->cpu_type = (enum Louis_cpu_type)of_device_get_match_data(dev);
}static int Louis_nand_probe(struct platform_device *pdev)
{int ret;struct Louis_nand_host  *host;struct nand_chip *nand_chip;struct mtd_info *mtd;struct resource *mem;printk(KERN_INFO "Here I am: %s:%i\n", __FILE__, __LINE__);host = devm_kzalloc(&pdev->dev, sizeof(struct Louis_nand_host), GFP_KERNEL);if(!host)return  ENOMEM;mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);       //分配memory资源host->nf_base = devm_ioremap_resource(&pdev->dev, mem);     //内存映射if(IS_ERR(host->nf_base)){  //判断是否是错误指针return PTR_ERR(host->nf_base);  //返回错误代码}mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);       //分配memory资源host->ecc_base = devm_ioremap_resource(&pdev->dev, mem);     //内存映射if(IS_ERR(host->ecc_base)){  //判断是否是错误指针return PTR_ERR(host->ecc_base);  //返回错误代码}nand_chip = &host->nand_chip;nand_chip->priv = host;nand_set_flash_node(nand_chip, pdev->dev.of_node);  //???mtd = nand_to_mtd(nand_chip);mtd->dev.parent = &pdev->dev;mtd->priv = nand_chip;// 禁用芯片选择和启用NAND闪存控制器 writel((0x01 << 1) | (0x01 << 0), host->nf_base + S5P_NFCONT);// 设置NAND IO行的地址 nand_chip->IO_ADDR_R = host->nf_base + S5P_NFDATA;nand_chip->IO_ADDR_W = host->nf_base + S5P_NFDATA;platform_set_drvdata(pdev, host);// 获取时钟源并使能(??? 为什么是两个)host->clk[0] = devm_clk_get(&pdev->dev, "nandxl");if(IS_ERR(host->clk[0])){dev_err(&pdev->dev, "cannot get clock of nandxl\n");return -ENOENT;}clk_prepare_enable(host->clk[0]);host->clk[1] = devm_clk_get(&pdev->dev, "nand");if(IS_ERR(host->clk[1])){dev_err(&pdev->dev, "cannot get clock of nand\n");return -ENOENT;}clk_prepare_enable(host->clk[1]);//获取CPU类型Louis_nand_parse_dt(host, &pdev->dev);nand_chip->select_chip = Louis_nand_select_chip; nand_chip->cmd_ctrl = Louis_nand_cmd_ctrl;nand_chip->dev_ready = Louis_nand_device_ready;Louis_nand_inithw(host);ret = nand_scan_with_ids(mtd, 1, NULL);if(ret)return ret;/*if(nand_chip->ecc.mode == NAND_ECC_HW){nand_chip->ecc.correct = s5pcxx_nand_correct_data;nand_chip->ecc.calculate = s5pcxx_nand_calculate_ecc;nand_chip->ecc.hwctl = s5pcxx_nand_enable_hwecc;nand_chip->ecc.read_page = s5pcxx_nand_read_page_hwecc;nand_chip->ecc.size = 512;nand_chip->ecc.bytes = 13;mtd_set_ooblayout(nand_to_mtd(nand_chip), &s5pcxx_ooblayout_ops);}  *//*ret = nand_scan_tail(mtd);*///获取实际的硬件信息之后Louis_nand_inithw_later(mtd);//mtd注册return mtd_device_register(mtd, NULL,0);
}static int Louis_nand_remove(struct platform_device *pdev)
{struct Louis_nand_host *host = platform_get_drvdata(pdev);struct mtd_info *mtd = nand_to_mtd(&host->nand_chip);nand_release(mtd);clk_disable_unprepare(host->clk[0]);clk_disable_unprepare(host->clk[1]);return 0;
}static const struct of_device_id Louis_nand_match[] = {{.compatible = "samsung,Louis210-nand", .data = TYPE_LOUIS210},{},
};
MODULE_DEVICE_TABLE(of, Louis_nand_match);static struct platform_driver Louis_nand_driver = {.probe      = Louis_nand_probe,.remove     = Louis_nand_remove,.driver     = {.name   = "Louis-nand",.owner  = THIS_MODULE,.of_match_table     = Louis_nand_match,},
};
module_platform_driver(Louis_nand_driver);MODULE_LICENSE("GPL");
MODULE_AUTHOR("LouisGou <LouisGou@gmail.com>");
MODULE_DESCRIPTION("Louis MTD NAND driver");

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