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>

1 files changed, 82 insertions, 0 deletions

diff --git a/target/linux/ar71xx/patches-4.9/640-MIPS-ath79-add-QCA955x-wmac-reset.patch b/target/linux/ar71xx/patches-4.9/640-MIPS-ath79-add-QCA955x-wmac-reset.patch
new file mode 100644
index 0000000000..d7f4536ba3
--- /dev/null
+++ b/target/linux/ar71xx/patches-4.9/640-MIPS-ath79-add-QCA955x-wmac-reset.patch
@@ -0,0 +1,82 @@
+--- a/arch/mips/ath79/common.c
++++ b/arch/mips/ath79/common.c
+@@ -38,7 +38,7 @@ unsigned int ath79_soc_rev;
+ void __iomem *ath79_pll_base;
+ void __iomem *ath79_reset_base;
+ EXPORT_SYMBOL_GPL(ath79_reset_base);
+-static void __iomem *ath79_ddr_base;
++void __iomem *ath79_ddr_base;
+ static void __iomem *ath79_ddr_wb_flush_base;
+ static void __iomem *ath79_ddr_pci_win_base;
+ 
+--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
++++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+@@ -32,7 +32,7 @@
+ #define AR71XX_SPI_SIZE		0x01000000
+ 
+ #define AR71XX_DDR_CTRL_BASE	(AR71XX_APB_BASE + 0x00000000)
+-#define AR71XX_DDR_CTRL_SIZE	0x100
++#define AR71XX_DDR_CTRL_SIZE	0x200
+ #define AR71XX_UART_BASE	(AR71XX_APB_BASE + 0x00020000)
+ #define AR71XX_UART_SIZE	0x100
+ #define AR71XX_USB_CTRL_BASE	(AR71XX_APB_BASE + 0x00030000)
+@@ -229,6 +229,9 @@
+ #define QCA953X_DDR_REG_FLUSH_PCIE	0xa8
+ #define QCA953X_DDR_REG_FLUSH_WMAC	0xac
+ 
++#define QCA955X_DDR_CTL_CONFIG		0x108
++#define QCA955X_DDR_CTL_CONFIG_ACT_WMAC	BIT(23)
++
+ /*
+  * PLL block
+  */
+--- a/arch/mips/ath79/dev-wmac.c
++++ b/arch/mips/ath79/dev-wmac.c
+@@ -170,6 +170,27 @@ static void qca953x_wmac_setup(void)
+ 	ath79_wmac_data.get_mac_revision = ar93xx_get_soc_revision;
+ }
+ 
++static int ar955x_wmac_reset(void)
++{
++	int i;
++
++	/* Try to wait for WMAC DDR activity to stop */
++	for (i = 0; i < 10; i++) {
++		if (!(__raw_readl(ath79_ddr_base + QCA955X_DDR_CTL_CONFIG) &
++		      QCA955X_DDR_CTL_CONFIG_ACT_WMAC))
++			break;
++
++		udelay(10);
++	}
++
++	ath79_device_reset_set(QCA955X_RESET_RTC);
++	udelay(10);
++	ath79_device_reset_clear(QCA955X_RESET_RTC);
++	udelay(10);
++
++	return 0;
++}
++
+ static void qca955x_wmac_setup(void)
+ {
+ 	u32 t;
+@@ -186,6 +207,8 @@ static void qca955x_wmac_setup(void)
+ 		ath79_wmac_data.is_clk_25mhz = false;
+ 	else
+ 		ath79_wmac_data.is_clk_25mhz = true;
++
++	ath79_wmac_data.external_reset = ar955x_wmac_reset;
+ }
+ 
+ #define AR93XX_WMAC_SIZE \
+--- a/arch/mips/ath79/common.h
++++ b/arch/mips/ath79/common.h
+@@ -19,6 +19,8 @@
+ #define ATH79_MEM_SIZE_MIN	(2 * 1024 * 1024)
+ #define ATH79_MEM_SIZE_MAX	(256 * 1024 * 1024)
+ 
++extern void __iomem *ath79_ddr_base;
++
+ void ath79_clocks_init(void);
+ unsigned long ath79_get_sys_clk_rate(const char *id);
+