ar71xx: Add kernel 4.9 support

This add support for kernel 4.9 to the ar71xx target.
It was compile tested with the generic, NAND and mikrotik subtarget.
Multiple members of the community tested it on their boards and did not
report any major problem so far.

Especially the NAND part received some changes to adapt to the new
kernel APIs. The serial driver hack used for the Arduino Yun was not
ported because the kernel changed there a lot.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

5 files changed, 286 insertions, 0 deletions

diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-c60.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-c60.c
index e78e311d2e..7b01af515b 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/mach-c60.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-c60.c
@@ -22,6 +22,7 @@
 #include <linux/platform/ar934x_nfc.h>
 #include <linux/ar8216_platform.h>
 #include <linux/ath9k_platform.h>
+#include <linux/version.h>
 
 #include <asm/mach-ath79/ar71xx_regs.h>
 
@@ -119,6 +120,7 @@ static struct mdio_board_info c60_mdio0_info[] = {
 	},
 };
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
 static struct nand_ecclayout c60_nand_ecclayout = {
 	.eccbytes       = 7,
 	.eccpos         = { 4, 8, 9, 10, 13, 14, 15 },
@@ -126,13 +128,67 @@ static struct nand_ecclayout c60_nand_ecclayout = {
 	.oobfree        = { { 0, 3 }, { 6, 2 }, { 11, 2 }, }
 };
 
+#else
+
+static int c60_ooblayout_ecc(struct mtd_info *mtd, int section,
+			     struct mtd_oob_region *oobregion)
+{
+	switch (section) {
+	case 0:
+		oobregion->offset = 4;
+		oobregion->length = 1;
+		return 0;
+	case 1:
+		oobregion->offset = 8;
+		oobregion->length = 3;
+		return 0;
+	case 2:
+		oobregion->offset = 13;
+		oobregion->length = 3;
+		return 0;
+	default:
+		return -ERANGE;
+	}
+}
+
+static int c60_ooblayout_free(struct mtd_info *mtd, int section,
+			      struct mtd_oob_region *oobregion)
+{
+	switch (section) {
+	case 0:
+		oobregion->offset = 0;
+		oobregion->length = 3;
+		return 0;
+	case 1:
+		oobregion->offset = 6;
+		oobregion->length = 2;
+		return 0;
+	case 2:
+		oobregion->offset = 11;
+		oobregion->length = 2;
+		return 0;
+	default:
+		return -ERANGE;
+	}
+}
+
+static const struct mtd_ooblayout_ops c60_nand_ecclayout_ops = {
+	.ecc = c60_ooblayout_ecc,
+	.free = c60_ooblayout_free,
+};
+#endif /* < 4.6 */
+
 static int c60_nand_scan_fixup(struct mtd_info *mtd)
 {
 	struct nand_chip *chip = mtd->priv;
 
 	chip->ecc.size = 512;
 	chip->ecc.strength = 4;
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
 	chip->ecc.layout = &c60_nand_ecclayout;
+#else
+	mtd_set_ooblayout(mtd, &c60_nand_ecclayout_ops);
+#endif
 	return 0;
 }
 
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-rb2011.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-rb2011.c
index 6e498395bd..9100a5977a 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/mach-rb2011.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-rb2011.c
@@ -23,6 +23,7 @@
 #include <linux/spi/flash.h>
 #include <linux/routerboot.h>
 #include <linux/gpio.h>
+#include <linux/version.h>
 
 #include <asm/prom.h>
 #include <asm/mach-ath79/ath79.h>
@@ -188,6 +189,7 @@ static void rb2011_nand_select_chip(int chip_no)
 	ndelay(500);
 }
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
 static struct nand_ecclayout rb2011_nand_ecclayout = {
 	.eccbytes	= 6,
 	.eccpos		= { 8, 9, 10, 13, 14, 15 },
@@ -195,16 +197,72 @@ static struct nand_ecclayout rb2011_nand_ecclayout = {
 	.oobfree	= { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
 };
 
+#else
+
+static int rb2011_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 rb2011_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 rb2011_nand_ecclayout_ops = {
+	.ecc = rb2011_ooblayout_ecc,
+	.free = rb2011_ooblayout_free,
+};
+#endif /* < 4.6 */
+
 static int rb2011_nand_scan_fixup(struct mtd_info *mtd)
 {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
 	struct nand_chip *chip = mtd->priv;
+#endif
 
 	if (mtd->writesize == 512) {
 		/*
 		 * Use the OLD Yaffs-1 OOB layout, otherwise RouterBoot
 		 * will not be able to find the kernel that we load.
 		 */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
 		chip->ecc.layout = &rb2011_nand_ecclayout;
+#else
+		mtd_set_ooblayout(mtd, &rb2011_nand_ecclayout_ops);
+#endif
 	}
 
 	return 0;
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-rb922.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-rb922.c
index 0c5373c365..577fb0eee0 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/mach-rb922.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-rb922.c
@@ -20,6 +20,7 @@
 #include <linux/routerboot.h>
 #include <linux/gpio.h>
 #include <linux/platform_data/phy-at803x.h>
+#include <linux/version.h>
 
 #include <asm/prom.h>
 #include <asm/mach-ath79/ath79.h>
@@ -132,6 +133,7 @@ static void rb922gs_nand_select_chip(int chip_no)
 	ndelay(500);
 }
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
 static struct nand_ecclayout rb922gs_nand_ecclayout = {
 	.eccbytes	= 6,
 	.eccpos		= { 8, 9, 10, 13, 14, 15 },
@@ -139,16 +141,72 @@ static struct nand_ecclayout rb922gs_nand_ecclayout = {
 	.oobfree	= { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
 };
 
+#else
+
+static int rb922gs_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 rb922gs_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 rb922gs_nand_ecclayout_ops = {
+	.ecc = rb922gs_ooblayout_ecc,
+	.free = rb922gs_ooblayout_free,
+};
+#endif /* < 4.6 */
+
 static int rb922gs_nand_scan_fixup(struct mtd_info *mtd)
 {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
 	struct nand_chip *chip = mtd->priv;
+#endif
 
 	if (mtd->writesize == 512) {
 		/*
 		 * Use the OLD Yaffs-1 OOB layout, otherwise RouterBoot
 		 * will not be able to find the kernel that we load.
 		 */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
 		chip->ecc.layout = &rb922gs_nand_ecclayout;
+#else
+		mtd_set_ooblayout(mtd, &rb922gs_nand_ecclayout_ops);
+#endif
 	}
 
 	return 0;
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-rb95x.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-rb95x.c
index e940d6cc11..9eaeaa7f9d 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/mach-rb95x.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-rb95x.c
@@ -24,6 +24,7 @@
 #include <linux/spi/flash.h>
 #include <linux/routerboot.h>
 #include <linux/gpio.h>
+#include <linux/version.h>
 
 #include <asm/mach-ath79/ath79.h>
 #include <asm/mach-ath79/ar71xx_regs.h>
@@ -146,6 +147,7 @@ static void rb95x_nand_select_chip(int chip_no)
 	ndelay(500);
 }
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
 static struct nand_ecclayout rb95x_nand_ecclayout = {
 	.eccbytes	= 6,
 	.eccpos		= { 8, 9, 10, 13, 14, 15 },
@@ -153,6 +155,56 @@ static struct nand_ecclayout rb95x_nand_ecclayout = {
 	.oobfree	= { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
 };
 
+#else
+
+static int rb95x_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 rb95x_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 rb95x_nand_ecclayout_ops = {
+	.ecc = rb95x_ooblayout_ecc,
+	.free = rb95x_ooblayout_free,
+};
+#endif /* < 4.6 */
+
 static int rb95x_nand_scan_fixup(struct mtd_info *mtd)
 {
 	struct nand_chip *chip = mtd->priv;
@@ -162,7 +214,11 @@ static int rb95x_nand_scan_fixup(struct mtd_info *mtd)
 		 * Use the OLD Yaffs-1 OOB layout, otherwise RouterBoot
 		 * will not be able to find the kernel that we load.
 		 */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
 		chip->ecc.layout = &rb95x_nand_ecclayout;
+#else
+		mtd_set_ooblayout(mtd, &rb95x_nand_ecclayout_ops);
+#endif
 	}
 
 	chip->options = NAND_NO_SUBPAGE_WRITE;
diff --git a/target/linux/ar71xx/files/arch/mips/ath79/mach-rbsxtlite.c b/target/linux/ar71xx/files/arch/mips/ath79/mach-rbsxtlite.c
index 62063e06a2..d2edfc9c71 100644
--- a/target/linux/ar71xx/files/arch/mips/ath79/mach-rbsxtlite.c
+++ b/target/linux/ar71xx/files/arch/mips/ath79/mach-rbsxtlite.c
@@ -24,6 +24,7 @@
 #include <linux/rle.h>
 #include <linux/routerboot.h>
 #include <linux/gpio.h>
+#include <linux/version.h>
 
 #include <asm/mach-ath79/ath79.h>
 #include <asm/mach-ath79/ar71xx_regs.h>
@@ -163,6 +164,7 @@ static void rbsxtlite_nand_select_chip(int chip_no)
 	ndelay(500);
 }
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
 static struct nand_ecclayout rbsxtlite_nand_ecclayout = {
 	.eccbytes	= 6,
 	.eccpos	 = { 8, 9, 10, 13, 14, 15 },
@@ -170,16 +172,72 @@ static struct nand_ecclayout rbsxtlite_nand_ecclayout = {
 	.oobfree	= { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
 };
 
+#else
+
+static int rbsxtlite_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 rbsxtlite_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 rbsxtlite_nand_ecclayout_ops = {
+	.ecc = rbsxtlite_ooblayout_ecc,
+	.free = rbsxtlite_ooblayout_free,
+};
+#endif /* < 4.6 */
+
 static int rbsxtlite_nand_scan_fixup(struct mtd_info *mtd)
 {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
 	struct nand_chip *chip = mtd->priv;
+#endif
 
 	if (mtd->writesize == 512) {
 		/*
 		* Use the OLD Yaffs-1 OOB layout, otherwise RouterBoot
 		* will not be able to find the kernel that we load.
 		*/
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4,6,0)
 		chip->ecc.layout = &rbsxtlite_nand_ecclayout;
+#else
+		mtd_set_ooblayout(mtd, &rbsxtlite_nand_ecclayout_ops);
+#endif
 	}
 
 	return 0;