USB: ehci-platform: support EHCIs with usic phy

Some EHCI controllers use usic phy (e.g rk3399/rk3288),
in order to enable these controllers, we need to set
some additional EHCI vendor-specific registers.

Support this feature in device tree when using the ehci
platform driver by adding a new property for it.

Conflicts:
        drivers/usb/host/ehci-platform.c

Change-Id: I279ccfdb5866df49828825bfd41b39fcd58a2832
Signed-off-by: William Wu <william.wu@rock-chips.com>
Signed-off-by: Frank Wang <frank.wang@rock-chips.com>

Documentation/devicetree/bindings/usb/usb-ehci.txt

@@ -15,6 +15,7 @@ Optional properties:
  - needs-reset-on-resume : boolean, set this to force EHCI reset after resume
  - has-transaction-translator : boolean, set this if EHCI have a Transaction
 				Translator built into the root hub.
+ - rockchip-has-usic : boolean, set this if EHCI use usic phy.
  - clocks : a list of phandle + clock specifier pairs
  - phys : see usb-hcd.txt in the current directory
  - resets : phandle + reset specifier pair

drivers/usb/host/ehci-platform.c

@@ -60,6 +60,18 @@ static void ehci_rockchip_relinquish_port(struct usb_hcd *hcd, int portnum)
 	ehci_writel(ehci, portsc, status_reg);
 }
 
+static void ehci_rockchip_usic_init(struct usb_hcd *hcd)
+{
+	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+
+	ehci_writel(ehci, USIC_ENABLE,
+		    hcd->regs + USIC_ENABLE_OFFSET);
+	ehci_writel(ehci, USIC_MICROFRAME_COUNT,
+		    hcd->regs + USIC_MICROFRAME_OFFSET);
+	ehci_writel(ehci, USIC_SCALE_DOWN,
+		    hcd->regs + USIC_SCALE_DOWN_OFFSET);
+}
+
 static int ehci_platform_reset(struct usb_hcd *hcd)
 {
 	struct platform_device *pdev = to_platform_device(hcd->self.controller);
@@ -198,6 +210,10 @@ static int ehci_platform_probe(struct platform_device *dev)
 			hcd->rk3288_relinquish_port_quirk = 1;
 		}
 
+		if (of_property_read_bool(dev->dev.of_node,
+					  "rockchip-has-usic"))
+			ehci->has_usic = 1;
+
 		for (clk = 0; clk < EHCI_MAX_CLKS; clk++) {
 			priv->clks[clk] = of_clk_get(dev->dev.of_node, clk);
 			if (IS_ERR(priv->clks[clk])) {
@@ -265,6 +281,9 @@ static int ehci_platform_probe(struct platform_device *dev)
 	if (err)
 		goto err_power;
 
+	if (ehci->has_usic)
+		ehci_rockchip_usic_init(hcd);
+
 	device_wakeup_enable(hcd->self.controller);
 	device_enable_async_suspend(hcd->self.controller);
 	platform_set_drvdata(dev, hcd);

drivers/usb/host/ehci.h

@@ -218,6 +218,13 @@ struct ehci_hcd {			/* one per controller */
 	unsigned		frame_index_bug:1; /* MosChip (AKA NetMos) */
 	unsigned		need_oc_pp_cycle:1; /* MPC834X port power */
 	unsigned		imx28_write_fix:1; /* For Freescale i.MX28 */
+	unsigned		has_usic:1;
+	#define	USIC_MICROFRAME_OFFSET	0x90
+	#define USIC_SCALE_DOWN_OFFSET	0xa0
+	#define USIC_ENABLE_OFFSET	0xb0
+	#define USIC_ENABLE		BIT(0)
+	#define USIC_SCALE_DOWN		BIT(2)
+	#define USIC_MICROFRAME_COUNT	0x1d4d
 
 	/* required for usb32 quirk */
 	#define OHCI_CTRL_HCFS          (3 << 6)