S5PV210之Nand flash驱动编写

1、s5pv210之nand flash驱动编写 大家好，又到了天嵌【共享】的时光，相对于前几期【嵌入式共享】做的主要是tq335x开发板的技术共享，本期打算做同是cortex-a8系列的tq210开发板的技术共享。本期是关于tq210开发板的nand flash驱动编写，可能源码部分会比较多，本文由博主girlkoo编写，谢谢他的共享。 跟裸机程序一样，s5pv210(tq210)的nand flash模块跟s3c2440(tq2440)的nand flash模块十分相像，假如不引入ecc，驱动程序的编写也十分容易，我是用法的-3.8.6(linux-3.8.3也一样)内核，驱动的api函数有些

2、变幻，不过原理是相通的，略微看一下内核源码并参考下其他平台的相关代码就可以自己写出nand flash驱动了，下面是nand flash驱动的源码，没有启用ecc，固然，你也可以改成软件ecc，但是我的觉得既然软件ecc不如hwecc快，我就采纳硬件ecc吧。include include include include include include include include struct s5p_nand_regs unsigned long nfconf; unsigned long nfcont; unsigned long nfcmmd; unsigned long nfadd

3、r; unsigned long nfdata; unsigned long nfmeccd0; unsigned long nfmeccd1; unsigned long nfseccd; unsigned long nfsblk; unsigned long nfeblk; unsigned long nfstat; unsigned long nfeccerr0; unsigned long nfeccerr1; unsigned long nfmecc0; unsigned long nfmecc1; unsigned long nfsecc; unsigned long nfmlcb

4、itpt; ; struct s5p_nand_ecc unsigned long nfeccconf; unsigned long nfecccont; unsigned long nfeccstat; unsigned long nfeccsecstat; unsigned long nfeccprgecc0; unsigned long nfeccprgecc1; unsigned long nfeccprgecc2; unsigned long nfeccprgecc3; unsigned long nfeccprgecc4; unsigned long nfeccprgecc5; u

5、nsigned long nfeccprgecc6; unsigned long nfeccerl0; unsigned long nfeccerl1; unsigned long nfeccerl2; unsigned long nfeccerl3; unsigned long nfeccerl4; unsigned long nfeccerl5; unsigned long nfeccerl6; unsigned long nfeccerl7; unsigned long nfeccerp0; unsigned long nfeccerp1; unsigned long nfeccerp2

6、; unsigned long nfeccerp3; unsigned long nfeccconecc0; unsigned long nfeccconecc1; unsigned long nfeccconecc2; unsigned long nfeccconecc3; unsigned long nfeccconecc4; unsigned long nfeccconecc5; unsigned long nfeccconecc6; ; static struct nand_chip *nand_chip; static struct mtd_info *s5p_mtd_info; s

7、tatic struct s5p_nand_regs *s5p_nand_regs; static struct s5p_nand_ecc *s5p_nand_ecc; static struct clk *s5p_nand_clk; static struct mtd_partition s5p_nand_partions = 0 = .name = "bootloader", .offset = 0, .size = sz_1m, , 1 = .name = "kernel", .offset = mtdpart_ofs_append, .size

8、= 5*sz_1m, , 2 = .name = "rootfs", .offset = mtdpart_ofs_append, .size = mtdpart_siz_full, , ; static void s5p_nand_select_chip(struct mtd_info *mtd, int chipnr) if(chipnr = -1) s5p_nand_regs->nfcont |= (1 else s5p_nand_regs->nfcont &= (1 static void s5p_nand_cmd_ctrl(struct mtd_

9、info *mtd, int cmd, unsigned int ctrl) if (ctrl & nand_cle) s5p_nand_regs->nfcmmd = cmd; else s5p_nand_regs->nfaddr = cmd; static int s5p_nand_ready(struct mtd_info *mtd) return (s5p_nand_regs->nfstat static int s5p_nand_probe(struct platform_device *pdev) int ret = 0; struct resource *

10、mem; /硬件部分初始化 mem = platform_get_resource(pdev, ioresource_mem, 0); if (!mem) dev_err(&pdev->dev, "can't get i/o resource memn"); return -enxio; s5p_nand_regs = (struct s5p_nand_regs *)ioremap(mem->start, resource_size(mem); if (s5p_nand_regs = null) dev_err(&pdev->dev

11、, "ioremap failedn"); ret = -eio; goto err_exit; s5p_nand_ecc = (struct s5p_nand_ecc *)ioremap(0xb0e20000, sizeof(struct s5p_nand_ecc); if(s5p_nand_ecc = null) dev_err(&pdev->dev, "ioremap failedn"); ret = -eio; goto err_iounmap; s5p_nand_clk = clk_get(&pdev->dev, &

12、quot;nand"); if(s5p_nand_clk = null) dev_dbg(&pdev->dev, "get clk failedn"); ret = -enodev; goto err_iounmap; clk_enable(s5p_nand_clk); s5p_nand_regs->nfconf = (3 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_

13、kernel); if(nand_chip = null) dev_err(&pdev->dev, "failed to allocate nand_chip structuren"); 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

14、mtd_info structuren"); 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_

15、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 errorn"); goto err_free_info; /添加分区信息 ret = mtd_device_parse_registe

16、r(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_n

17、and_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(nand_chip); clk_disable(s5p_nand_clk); clk_put(s5p_nand_clk); if(s5p_nand_regs = null) iounmap(s5p_nand_regs); return 0; static struct platform_driver s5p_na