ar71xx: fix mikrotik routerboard nand driver issues with linux 4.9

[openwrt/openwrt.git] / target / linux / ar71xx / files / drivers / mtd / nand / rb4xx_nand.c

diff --git a/target/linux/ar71xx/files/drivers/mtd/nand/rb4xx_nand.c b/target/linux/ar71xx/files/drivers/mtd/nand/rb4xx_nand.c
index f2b430ec4b74bebf3f0c02e21f1baad5f476d4bf..5bbe9789fb5fa7982ea85d94480be38a5076a020 100644 (file)
--- a/target/linux/ar71xx/files/drivers/mtd/nand/rb4xx_nand.c
+++ b/target/linux/ar71xx/files/drivers/mtd/nand/rb4xx_nand.c
@@ -23,6 +23,7 @@
 #include <linux/io.h>
 #include <linux/gpio.h>
 #include <linux/slab.h>
+#include <linux/version.h>
 
 #include <asm/mach-ath79/ath79.h>
 #include <asm/mach-ath79/rb4xx_cpld.h>
@@ -38,9 +39,32 @@
 
 struct rb4xx_nand_info {
        struct nand_chip        chip;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
        struct mtd_info         mtd;
+#endif
 };
 
+static inline struct rb4xx_nand_info *mtd_to_rbinfo(struct mtd_info *mtd)
+{
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
+       return container_of(mtd, struct rb4xx_nand_info, mtd);
+#else
+       struct nand_chip *chip = mtd_to_nand(mtd);
+
+       return container_of(chip, struct rb4xx_nand_info, chip);
+#endif
+}
+
+static struct mtd_info *rbinfo_to_mtd(struct rb4xx_nand_info *nfc)
+{
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
+       return &nfc->mtd;
+#else
+       return nand_to_mtd(&nfc->chip);
+#endif
+}
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
 /*
  * We need to use the OLD Yaffs-1 OOB layout, otherwise the RB bootloader
  * will not be able to find the kernel that we load.
@@ -52,6 +76,56 @@ static struct nand_ecclayout rb4xx_nand_ecclayout = {
        .oobfree        = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
 };
 
+#else
+
+static int rb4xx_ooblayout_ecc(struct mtd_info *mtd, int section,
+                              struct mtd_oob_region *oobregion)
+{
+       switch (section) {
+       case 0:
+               oobregion->offset = 8;
+               oobregion->length = 3;
+               return 0;
+       case 1:
+               oobregion->offset = 13;
+               oobregion->length = 3;
+               return 0;
+       default:
+               return -ERANGE;
+       }
+}
+
+static int rb4xx_ooblayout_free(struct mtd_info *mtd, int section,
+                               struct mtd_oob_region *oobregion)
+{
+       switch (section) {
+       case 0:
+               oobregion->offset = 0;
+               oobregion->length = 4;
+               return 0;
+       case 1:
+               oobregion->offset = 4;
+               oobregion->length = 1;
+               return 0;
+       case 2:
+               oobregion->offset = 6;
+               oobregion->length = 2;
+               return 0;
+       case 3:
+               oobregion->offset = 11;
+               oobregion->length = 2;
+               return 0;
+       default:
+               return -ERANGE;
+       }
+}
+
+static const struct mtd_ooblayout_ops rb4xx_nand_ecclayout_ops = {
+       .ecc = rb4xx_ooblayout_ecc,
+       .free = rb4xx_ooblayout_free,
+};
+#endif /* < 4.6 */
+
 static struct mtd_partition rb4xx_nand_partitions[] = {
        {
                .name   = "booter",
@@ -65,7 +139,7 @@ static struct mtd_partition rb4xx_nand_partitions[] = {
                .size   = (4 * 1024 * 1024) - (256 * 1024),
        },
        {
-               .name   = "rootfs",
+               .name   = "ubi",
                .offset = MTDPART_OFS_NXTBLK,
                .size   = MTDPART_SIZ_FULL,
        },
@@ -139,6 +213,7 @@ static void rb4xx_nand_read_buf(struct mtd_info *mtd, unsigned char *buf,
 static int rb4xx_nand_probe(struct platform_device *pdev)
 {
        struct rb4xx_nand_info  *info;
+       struct mtd_info *mtd;
        int ret;
 
        printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
@@ -207,8 +282,12 @@ static int rb4xx_nand_probe(struct platform_device *pdev)
        }
 
        info->chip.priv = &info;
-       info->mtd.priv  = &info->chip;
-       info->mtd.owner = THIS_MODULE;
+       mtd = rbinfo_to_mtd(info);
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
+       mtd->priv       = &info->chip;
+#endif
+       mtd->owner      = THIS_MODULE;
 
        info->chip.cmd_ctrl     = rb4xx_nand_cmd_ctrl;
        info->chip.dev_ready    = rb4xx_nand_dev_ready;
@@ -218,26 +297,33 @@ static int rb4xx_nand_probe(struct platform_device *pdev)
 
        info->chip.chip_delay   = 25;
        info->chip.ecc.mode     = NAND_ECC_SOFT;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)
+       info->chip.ecc.algo = NAND_ECC_HAMMING;
+#endif
        info->chip.options = NAND_NO_SUBPAGE_WRITE;
 
        platform_set_drvdata(pdev, info);
 
-       ret = nand_scan_ident(&info->mtd, 1, NULL);
+       ret = nand_scan_ident(mtd, 1, NULL);
        if (ret) {
                ret = -ENXIO;
                goto err_free_info;
        }
 
-       if (info->mtd.writesize == 512)
+       if (mtd->writesize == 512)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
                info->chip.ecc.layout = &rb4xx_nand_ecclayout;
+#else
+               mtd_set_ooblayout(mtd, &rb4xx_nand_ecclayout_ops);
+#endif
 
-       ret = nand_scan_tail(&info->mtd);
+       ret = nand_scan_tail(mtd);
        if (ret) {
                return -ENXIO;
                goto err_set_drvdata;
        }
 
-       mtd_device_register(&info->mtd, rb4xx_nand_partitions,
+       mtd_device_register(mtd, rb4xx_nand_partitions,
                                ARRAY_SIZE(rb4xx_nand_partitions));
        if (ret)
                goto err_release_nand;
@@ -245,7 +331,7 @@ static int rb4xx_nand_probe(struct platform_device *pdev)
        return 0;
 
 err_release_nand:
-       nand_release(&info->mtd);
+       nand_release(mtd);
 err_set_drvdata:
        platform_set_drvdata(pdev, NULL);
 err_free_info:
@@ -266,7 +352,7 @@ static int rb4xx_nand_remove(struct platform_device *pdev)
 {
        struct rb4xx_nand_info *info = platform_get_drvdata(pdev);
 
-       nand_release(&info->mtd);
+       nand_release(rbinfo_to_mtd(info));
        platform_set_drvdata(pdev, NULL);
        kfree(info);
        gpio_free(RB4XX_NAND_GPIO_NCE);