FL2440的U-boot-2010.09移植（五）uboot架構中NAND FLash驅動修改

1. #define NF_BASE 0x4e000000
3. #if defined(CONFIG_S3C2410)
4. #define S3C2410_NFCONF_EN (1<<15)
5. #define S3C2410_NFCONF_512BYTE (1<<14)
6. #define S3C2410_NFCONF_4STEP (1<<13)
7. #define S3C2410_NFCONF_INITECC (1<<12)
8. #define S3C2410_NFCONF_nFCE (1<<11)
9. #define S3C2410_NFCONF_TACLS(x) ((x)<<8)
10. #define S3C2410_NFCONF_TWRPH0(x) ((x)<<4)
11. #define S3C2410_NFCONF_TWRPH1(x) ((x)<<0)
13. #define S3C2410_ADDR_NALE 4
14. #define S3C2410_ADDR_NCLE 8
15. #endif
17. #if defined(CONFIG_S3C2440)
18. #define S3C2410_NFCONT_EN (1<<0)
19. #define S3C2410_NFCONT_INITECC (1<<4)
20. #define S3C2410_NFCONT_nFCE (1<<1)
21. #define S3C2410_NFCONT_MAINECCLOCK (1<<5)
22. #define S3C2410_NFCONF_TACLS(x) ((x)<<12)
23. #define S3C2410_NFCONF_TWRPH0(x) ((x)<<8)
24. #define S3C2410_NFCONF_TWRPH1(x) ((x)<<4)
26. #define S3C2410_ADDR_NALE 0x08
27. #define S3C2410_ADDR_NCLE 0x0c
28. #endif

u-boot.2010.09自帶的S3C2410_nand.c的s3c2410_hwcontrol函數有錯。在此函數中，把chip->IO_ADDR_W值改寫了，導致在寫數據時出現錯誤。解決方法是使用一全局變量代替 chip->IO_ADDR_W。在 s3c2410_hwcontrol 函數上一行定義這個全局變量，然後修改 s3c2410_hwcontrol 函數（修改71行），讓它支持 S3C2440，如下：

1. ulong IO_ADDR_W = NF_BASE;
2. static void s3c2410_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
3. {
4. //struct nand_chip *chip = mtd->priv;
5. struct s3c2410_nand *nand = s3c2410_get_base_nand();
7. debugX(1, "hwcontrol(): 0x%02x 0x%02x\n", cmd, ctrl);
9. if (ctrl & NAND_CTRL_CHANGE) {
10. //ulong IO_ADDR_W = (ulong)nand;
11. IO_ADDR_W = (ulong)nand;
13. if (!(ctrl & NAND_CLE))
14. IO_ADDR_W |= S3C2410_ADDR_NCLE;
15. if (!(ctrl & NAND_ALE))
16. IO_ADDR_W |= S3C2410_ADDR_NALE;
18. //chip->IO_ADDR_W = (void *)IO_ADDR_W;
20. #if defined(CONFIG_S3C2410)
21. if (ctrl & NAND_NCE)
22. writel(readl(&nand->NFCONF) & ~S3C2410_NFCONF_nFCE,
23. &nand->NFCONF);
24. else
25. writel(readl(&nand->NFCONF) | S3C2410_NFCONF_nFCE,
26. &nand->NFCONF);
27. #endif
29. #if defined(CONFIG_S3C2440)
30. if (ctrl & NAND_NCE)
31. writel(readl(&nand->NFCONT) & ~S3C2410_NFCONT_nFCE,
32. &nand->NFCONT);
33. else
34. writel(readl(&nand->NFCONT) | S3C2410_NFCONT_nFCE,
35. &nand->NFCONT);
36. #endif
37. }
39. if (cmd != NAND_CMD_NONE)
40. //writeb(cmd, chip->IO_ADDR_W);
41. writeb(cmd, (void *)IO_ADDR_W);
42. }

然後修改函數s3c2410_nand_enable_hwecc如下：

1. void s3c2410_nand_enable_hwecc(struct mtd_info *mtd, int mode)
2. {
3. struct s3c2410_nand *nand = s3c2410_get_base_nand();
4. debugX(1, "s3c2410_nand_enable_hwecc(%p, %d)\n", mtd, mode);
5. #if defined(CONFIG_S3C2410)
6. writel(readl(&nand->NFCONF) | S3C2410_NFCONF_INITECC, &nand->NFCONF);
7. #endif
9. #if defined(CONFIG_S3C2440)
10. writel(readl(&nand->NFCONT) | S3C2410_NFCONT_INITECC, &nand->NFCONT);
11. #endif
12. }

最後修改board_nand_init 函數如下：

1. int board_nand_init(struct nand_chip *nand)
2. {
3. u_int32_t cfg;
4. u_int8_t tacls, twrph0, twrph1;
5. struct s3c24x0_clock_power *clk_power = s3c24x0_get_base_clock_power();
6. struct s3c2410_nand *nand_reg = s3c2410_get_base_nand();
8. debugX(1, "board_nand_init()\n");
10. writel(readl(&clk_power->CLKCON) | (1 << 4), &clk_power->CLKCON);
12. #if defined(CONFIG_S3C2410)
13. /* initialize hardware */
14. twrph0 = 3;
15. twrph1 = 0;
16. tacls = 0;
18. cfg = S3C2410_NFCONF_EN;
19. cfg |= S3C2410_NFCONF_TACLS(tacls - 1);
20. cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);
21. cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);
22. writel(cfg, &nand_reg->NFCONF);
24. /* initialize nand_chip data structure */
25. nand->IO_ADDR_R = nand->IO_ADDR_W = (void *)&nand_reg->NFDATA;
26. #endif
28. #if defined(CONFIG_S3C2440)
29. /* initialize hardware */
30. tacls = 0;
31. twrph0 = 4;
32. twrph1 = 2;
35. cfg = 0;
36. cfg |= S3C2410_NFCONF_TACLS(tacls - 1);
37. cfg |= S3C2410_NFCONF_TWRPH0(twrph0 - 1);
38. cfg |= S3C2410_NFCONF_TWRPH1(twrph1 - 1);
39. writel(cfg, &nand_reg->NFCONF);
41. cfg = (0<<13)|(0<<12)|(0<<10)|(0<<9)|(0<<8)|(0<<6)|(0<<5)|(1<<4)|(0<<1)|(1<<0);
42. writel(cfg, &nand_reg->NFCONT);
43. /* initialize nand_chip data structure */
44. nand->IO_ADDR_R = nand->IO_ADDR_W = (void *)&nand_reg->NFDATA;
45. #endif
47. nand->select_chip = NULL;
48. ……

相關閱讀：

U-Boot源代碼下載地址 http://www.linuxidc.com/Linux/2011-07/38897.htm

FL2440的U-boot-2010.09移植（一）http://www.linuxidc.com/Linux/2012-06/63755.htm
FL2440的U-boot-2010.09移植（二）http://www.linuxidc.com/Linux/2012-06/63756.htm
FL2440的U-boot-2010.09移植（三）DM9000網卡及開發板相關配置 http://www.linuxidc.com/Linux/2012-07/64155.htm
FL2440的U-boot-2010.09移植（四） 添加NOR FLash啟動支持 http://www.linuxidc.com/Linux/2012-07/64156.htm
FL2440的U-boot-2010.09移植（五）uboot架構中NAND FLash驅動修改 http://www.linuxidc.com/Linux/2012-07/64157.htm
FL2440的U-boot-2010.09移植（六）NAND FLash啟動支持 http://www.linuxidc.com/Linux/2012-07/641587.htm
FL2440的U-boot-2010.09移植（七）LCD的支持 http://www.linuxidc.com/Linux/2012-07/641587.htm
針對FL2440開發板的u-boot-2010.09版本補丁 http://www.linuxidc.com/Linux/2012-07/64116.htm