From: Matthias Schiffer <mschiffer@universe-factory.net>
Date: Tue, 19 Jul 2016 17:48:53 +0200
Subject: ar71xx: define wmac reset function for QCA955x

Signed-off-by: Felix Fietkau <nbd@nbd.name>

Backport of LEDE a176168a85477caa44eef7e979567d1d52868fde

diff --git a/target/linux/ar71xx/patches-3.18/640-MIPS-ath79-add-QCA955x-wmac-reset.patch b/target/linux/ar71xx/patches-3.18/640-MIPS-ath79-add-QCA955x-wmac-reset.patch
new file mode 100644
index 0000000000000000000000000000000000000000..4ac5acd618748fc9ad0f091d110d2503cdc39d53
--- /dev/null
+++ b/target/linux/ar71xx/patches-3.18/640-MIPS-ath79-add-QCA955x-wmac-reset.patch
@@ -0,0 +1,71 @@
+--- 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	(128 * 1024 * 1024)
+ 
++extern void __iomem *ath79_ddr_base;
++
+ void ath79_clocks_init(void);
+ unsigned long ath79_get_sys_clk_rate(const char *id);
+ 
+--- a/arch/mips/ath79/dev-wmac.c
++++ b/arch/mips/ath79/dev-wmac.c
+@@ -149,6 +149,27 @@ static void ar934x_wmac_setup(void)
+ 		ath79_wmac_data.is_clk_25mhz = true;
+ }
+ 
++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;
+@@ -165,6 +186,8 @@ 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;
+ }
+ 
+ static bool __init
+--- 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)
+@@ -173,6 +173,9 @@
+ #define AR934X_DDR_REG_FLUSH_PCIE	0xa8
+ #define AR934X_DDR_REG_FLUSH_WMAC	0xac
+ 
++#define QCA955X_DDR_CTL_CONFIG		0x108
++#define QCA955X_DDR_CTL_CONFIG_ACT_WMAC	BIT(23)
++
+ /*
+  * PLL block
+  */