S5PV210之Nand flash驱动编写

时间：12-10 来源：互联网点击：

dev_dbg(&pdev->dev, "get clk failed\n");
ret = -ENODEV;
goto err_iounmap;
}
clk_enable(s5p_nand_clk);
s5p_nand_regs->nfconf = (3<<12)|(5<<8)|(3<<4)|(1<<1);
s5p_nand_regs->nfcont |= 3;
//分配驱动相关结构体
nand_chip = (struct nand_chip *)kzalloc(sizeof(struct nand_chip), GFP_KERNEL);
if(nand_chip == NULL){
dev_err(&pdev->dev, "failed to allocate nand_chip structure\n");
ret = -ENOMEM;
goto err_clk_put;
}
s5p_mtd_info = (struct mtd_info *)kzalloc(sizeof(struct mtd_info), GFP_KERNEL);
if(s5p_mtd_info == NULL){
dev_err(&pdev->dev, "failed to allocate mtd_info structure\n");
ret = -ENOMEM;
goto err_free_chip;
}
//设置驱动相关结构体
nand_chip->select_chip = s5p_nand_select_chip;
nand_chip->cmd_ctrl = s5p_nand_cmd_ctrl;
nand_chip->IO_ADDR_R = &s5p_nand_regs->nfdata;
nand_chip->IO_ADDR_W = &s5p_nand_regs->nfdata;
nand_chip->dev_ready = s5p_nand_ready;
nand_chip->ecc.mode = NAND_ECC_SOFT;
s5p_mtd_info->priv = nand_chip;
s5p_mtd_info->owner = THIS_MODULE;
//扫描Nand flash 设备
if(nand_scan(s5p_mtd_info, 1)){
dev_dbg(&pdev->dev, "nand scan error\n");
goto err_free_info;
}
//添加分区信息
ret = mtd_device_parse_register(s5p_mtd_info, NULL, NULL, s5p_nand_partions, ARRAY_SIZE(s5p_nand_partions));
if(!ret)
return 0;
err_free_info:
kfree(s5p_mtd_info);
err_free_chip:
kfree(nand_chip);
err_clk_put:
clk_disable(s5p_nand_clk);
clk_put(s5p_nand_clk);
err_iounmap:
//if(s5p_nand_ecc == NULL)
// iounmap(s5p_nand_ecc);
if(s5p_nand_regs == NULL)
iounmap(s5p_nand_regs);
err_exit:
return ret;
}
static int s5p_nand_remove(struct platform_device *pdev){
nand_release(s5p_mtd_info);
kfree(s5p_mtd_info);
kfree(nan

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