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, 101 insertions, 0 deletions

diff --git a/target/linux/ar71xx/patches-4.9/525-MIPS-ath79-enable-qca-usb-quirks.patch b/target/linux/ar71xx/patches-4.9/525-MIPS-ath79-enable-qca-usb-quirks.patch
new file mode 100644
index 0000000000..0e33674adf
--- /dev/null
+++ b/target/linux/ar71xx/patches-4.9/525-MIPS-ath79-enable-qca-usb-quirks.patch
@@ -0,0 +1,101 @@
+--- a/arch/mips/ath79/dev-usb.c
++++ b/arch/mips/ath79/dev-usb.c
+@@ -37,6 +37,8 @@ static struct usb_ehci_pdata ath79_ehci_
+ static struct usb_ehci_pdata ath79_ehci_pdata_v2 = {
+ 	.caps_offset		= 0x100,
+ 	.has_tt			= 1,
++	.qca_force_host_mode	= 1,
++	.qca_force_16bit_ptw	= 1,
+ };
+ 
+ static void __init ath79_usb_register(const char *name, int id,
+@@ -159,6 +161,9 @@ static void __init ar913x_usb_setup(void
+ 	ath79_device_reset_clear(AR913X_RESET_USB_PHY);
+ 	mdelay(10);
+ 
++	ath79_ehci_pdata_v2.qca_force_host_mode	= 0;
++	ath79_ehci_pdata_v2.qca_force_16bit_ptw	= 0;
++
+ 	ath79_usb_register("ehci-platform", -1,
+ 			   AR913X_EHCI_BASE, AR913X_EHCI_SIZE,
+ 			   ATH79_CPU_IRQ(3),
+@@ -182,14 +187,34 @@ static void __init ar933x_usb_setup(void
+ 			   &ath79_ehci_pdata_v2, sizeof(ath79_ehci_pdata_v2));
+ }
+ 
+-static void __init ar934x_usb_setup(void)
++static void enable_tx_tx_idp_violation_fix(unsigned base)
+ {
+-	u32 bootstrap;
++	void __iomem *phy_reg;
++	u32 t;
++
++	phy_reg = ioremap(base, 4);
++	if (!phy_reg)
++		return;
++
++	t = ioread32(phy_reg);
++	t &= ~0xff;
++	t |= 0x58;
++	iowrite32(t, phy_reg);
++
++	iounmap(phy_reg);
++}
+ 
+-	bootstrap = ath79_reset_rr(AR934X_RESET_REG_BOOTSTRAP);
+-	if (bootstrap & AR934X_BOOTSTRAP_USB_MODE_DEVICE)
++static void ar934x_usb_reset_notifier(struct platform_device *pdev)
++{
++	if (pdev->id != -1)
+ 		return;
+ 
++	enable_tx_tx_idp_violation_fix(0x18116c94);
++	dev_info(&pdev->dev, "TX-TX IDP fix enabled\n");
++}
++
++static void __init ar934x_usb_setup(void)
++{
+ 	ath79_device_reset_set(AR934X_RESET_USBSUS_OVERRIDE);
+ 	udelay(1000);
+ 
+@@ -202,14 +227,40 @@ static void __init ar934x_usb_setup(void
+ 	ath79_device_reset_clear(AR934X_RESET_USB_HOST);
+ 	udelay(1000);
+ 
++	if (ath79_soc_rev >= 3)
++		ath79_ehci_pdata_v2.reset_notifier = ar934x_usb_reset_notifier;
++
+ 	ath79_usb_register("ehci-platform", -1,
+ 			   AR934X_EHCI_BASE, AR934X_EHCI_SIZE,
+ 			   ATH79_CPU_IRQ(3),
+ 			   &ath79_ehci_pdata_v2, sizeof(ath79_ehci_pdata_v2));
+ }
+ 
++static void qca955x_usb_reset_notifier(struct platform_device *pdev)
++{
++	u32 base;
++
++	switch (pdev->id) {
++	case 0:
++		base = 0x18116c94;
++		break;
++
++	case 1:
++		base = 0x18116e54;
++		break;
++
++	default:
++		return;
++	}
++
++	enable_tx_tx_idp_violation_fix(base);
++	dev_info(&pdev->dev, "TX-TX IDP fix enabled\n");
++}
++
+ static void __init qca955x_usb_setup(void)
+ {
++	ath79_ehci_pdata_v2.reset_notifier = qca955x_usb_reset_notifier;
++
+ 	ath79_usb_register("ehci-platform", 0,
+ 			   QCA955X_EHCI0_BASE, QCA955X_EHCI_SIZE,
+ 			   ATH79_IP3_IRQ(0),