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, 103 insertions, 0 deletions

diff --git a/target/linux/ar71xx/patches-4.9/490-usb-ehci-add-quirks-for-qca-socs.patch b/target/linux/ar71xx/patches-4.9/490-usb-ehci-add-quirks-for-qca-socs.patch
new file mode 100644
index 0000000000..8a05adb050
--- /dev/null
+++ b/target/linux/ar71xx/patches-4.9/490-usb-ehci-add-quirks-for-qca-socs.patch
@@ -0,0 +1,103 @@
+--- a/drivers/usb/host/ehci-hcd.c
++++ b/drivers/usb/host/ehci-hcd.c
+@@ -252,6 +252,37 @@ int ehci_reset(struct ehci_hcd *ehci)
+ 	command |= CMD_RESET;
+ 	dbg_cmd (ehci, "reset", command);
+ 	ehci_writel(ehci, command, &ehci->regs->command);
++
++	if (ehci->qca_force_host_mode) {
++		u32 usbmode;
++
++		udelay(1000);
++
++		usbmode = ehci_readl(ehci, &ehci->regs->usbmode);
++		usbmode |= USBMODE_CM_HC | (1 << 4);
++		ehci_writel(ehci, usbmode, &ehci->regs->usbmode);
++
++		ehci_dbg(ehci, "forced host mode, usbmode: %08x\n",
++			 ehci_readl(ehci, &ehci->regs->usbmode));
++	}
++
++	if (ehci->qca_force_16bit_ptw) {
++		u32 port_status;
++
++		udelay(1000);
++
++		/* enable 16-bit UTMI interface */
++		port_status = ehci_readl(ehci, &ehci->regs->port_status[0]);
++		port_status |= BIT(28);
++		ehci_writel(ehci, port_status, &ehci->regs->port_status[0]);
++
++		ehci_dbg(ehci, "16-bit UTMI interface enabled, status: %08x\n",
++			 ehci_readl(ehci, &ehci->regs->port_status[0]));
++	}
++
++	if (ehci->reset_notifier)
++		ehci->reset_notifier(ehci_to_hcd(ehci));
++
+ 	ehci->rh_state = EHCI_RH_HALTED;
+ 	ehci->next_statechange = jiffies;
+ 	retval = ehci_handshake(ehci, &ehci->regs->command,
+--- a/drivers/usb/host/ehci.h
++++ b/drivers/usb/host/ehci.h
+@@ -231,6 +231,10 @@ struct ehci_hcd {			/* one per controlle
+ 	unsigned		need_oc_pp_cycle:1; /* MPC834X port power */
+ 	unsigned		imx28_write_fix:1; /* For Freescale i.MX28 */
+ 	unsigned		ignore_oc:1;
++	unsigned		qca_force_host_mode:1;
++	unsigned		qca_force_16bit_ptw:1; /* force 16 bit UTMI */
++
++	void (*reset_notifier)(struct usb_hcd *hcd);
+ 
+ 	/* required for usb32 quirk */
+ 	#define OHCI_CTRL_HCFS          (3 << 6)
+--- a/include/linux/usb/ehci_pdriver.h
++++ b/include/linux/usb/ehci_pdriver.h
+@@ -50,6 +50,8 @@ struct usb_ehci_pdata {
+ 	unsigned	reset_on_resume:1;
+ 	unsigned	dma_mask_64:1;
+ 	unsigned	ignore_oc:1;
++	unsigned	qca_force_host_mode:1;
++	unsigned	qca_force_16bit_ptw:1;
+ 
+ 	/* Turn on all power and clocks */
+ 	int (*power_on)(struct platform_device *pdev);
+@@ -59,6 +61,7 @@ struct usb_ehci_pdata {
+ 	 * turn off everything else */
+ 	void (*power_suspend)(struct platform_device *pdev);
+ 	int (*pre_setup)(struct usb_hcd *hcd);
++	void (*reset_notifier)(struct platform_device *pdev);
+ };
+ 
+ #endif /* __USB_CORE_EHCI_PDRIVER_H */
+--- a/drivers/usb/host/ehci-platform.c
++++ b/drivers/usb/host/ehci-platform.c
+@@ -52,6 +52,14 @@ struct ehci_platform_priv {
+ 
+ static const char hcd_name[] = "ehci-platform";
+ 
++static void ehci_platform_reset_notifier(struct usb_hcd *hcd)
++{
++	struct platform_device *pdev = to_platform_device(hcd->self.controller);
++	struct usb_ehci_pdata *pdata = pdev->dev.platform_data;
++
++	pdata->reset_notifier(pdev);
++}
++
+ static int ehci_platform_reset(struct usb_hcd *hcd)
+ {
+ 	struct platform_device *pdev = to_platform_device(hcd->self.controller);
+@@ -261,6 +269,13 @@ static int ehci_platform_probe(struct pl
+ 		priv->reset_on_resume = true;
+ 	if (pdata->ignore_oc)
+ 		ehci->ignore_oc = 1;
++	if (pdata->qca_force_host_mode)
++		ehci->qca_force_host_mode = 1;
++	if (pdata->qca_force_16bit_ptw)
++		ehci->qca_force_16bit_ptw = 1;
++
++	if (pdata->reset_notifier)
++		ehci->reset_notifier = ehci_platform_reset_notifier;
+ 
+ #ifndef CONFIG_USB_EHCI_BIG_ENDIAN_MMIO
+ 	if (ehci->big_endian_mmio) {