USB: extend ehci-fsl and fsl_udc_core driver for OTG operation

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Cc: Li Yang <leoli@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 78 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index caf3d4ac42bd..623732a312dd 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -117,6 +117,9 @@ static int usb_hcd_fsl_probe(const struct hc_driver *driver,
 
 	pdata->regs = hcd->regs;
 
+	if (pdata->power_budget)
+		hcd->power_budget = pdata->power_budget;
+
 	/*
 	 * do platform specific init: check the clock, grab/config pins, etc.
 	 */
@@ -134,6 +137,30 @@ static int usb_hcd_fsl_probe(const struct hc_driver *driver,
 	retval = usb_add_hcd(hcd, irq, IRQF_DISABLED | IRQF_SHARED);
 	if (retval != 0)
 		goto err4;
+
+#ifdef CONFIG_USB_OTG
+	if (pdata->operating_mode == FSL_USB2_DR_OTG) {
+		struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+
+		ehci->transceiver = otg_get_transceiver();
+		dev_dbg(&pdev->dev, "hcd=0x%p  ehci=0x%p, transceiver=0x%p\n",
+			hcd, ehci, ehci->transceiver);
+
+		if (ehci->transceiver) {
+			retval = otg_set_host(ehci->transceiver,
+					      &ehci_to_hcd(ehci)->self);
+			if (retval) {
+				if (ehci->transceiver)
+					put_device(ehci->transceiver->dev);
+				goto err4;
+			}
+		} else {
+			dev_err(&pdev->dev, "can't find transceiver\n");
+			retval = -ENODEV;
+			goto err4;
+		}
+	}
+#endif
 	return retval;
 
       err4:
@@ -164,6 +191,12 @@ static void usb_hcd_fsl_remove(struct usb_hcd *hcd,
 			       struct platform_device *pdev)
 {
 	struct fsl_usb2_platform_data *pdata = pdev->dev.platform_data;
+	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+
+	if (ehci->transceiver) {
+		otg_set_host(ehci->transceiver, NULL);
+		put_device(ehci->transceiver->dev);
+	}
 
 	usb_remove_hcd(hcd);
 
@@ -544,6 +577,38 @@ static struct dev_pm_ops ehci_fsl_pm_ops = {
 #define EHCI_FSL_PM_OPS		NULL
 #endif /* CONFIG_PM */
 
+#ifdef CONFIG_USB_OTG
+static int ehci_start_port_reset(struct usb_hcd *hcd, unsigned port)
+{
+	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+	u32 status;
+
+	if (!port)
+		return -EINVAL;
+
+	port--;
+
+	/* start port reset before HNP protocol time out */
+	status = readl(&ehci->regs->port_status[port]);
+	if (!(status & PORT_CONNECT))
+		return -ENODEV;
+
+	/* khubd will finish the reset later */
+	if (ehci_is_TDI(ehci)) {
+		writel(PORT_RESET |
+		       (status & ~(PORT_CSC | PORT_PEC | PORT_OCC)),
+		       &ehci->regs->port_status[port]);
+	} else {
+		writel(PORT_RESET, &ehci->regs->port_status[port]);
+	}
+
+	return 0;
+}
+#else
+#define ehci_start_port_reset	NULL
+#endif /* CONFIG_USB_OTG */
+
+
 static const struct hc_driver ehci_fsl_hc_driver = {
 	.description = hcd_name,
 	.product_desc = "Freescale On-Chip EHCI Host Controller",
@@ -583,6 +648,7 @@ static const struct hc_driver ehci_fsl_hc_driver = {
 	.hub_control = ehci_hub_control,
 	.bus_suspend = ehci_bus_suspend,
 	.bus_resume = ehci_bus_resume,
+	.start_port_reset = ehci_start_port_reset,
 	.relinquish_port = ehci_relinquish_port,
 	.port_handed_over = ehci_port_handed_over,
 
diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index 1a21799195af..ea6184bf48d0 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -27,6 +27,7 @@
  */
 
 /*-------------------------------------------------------------------------*/
+#include <linux/usb/otg.h>
 
 #define	PORT_WAKE_BITS	(PORT_WKOC_E|PORT_WKDISC_E|PORT_WKCONN_E)
 
@@ -801,6 +802,13 @@ static int ehci_hub_control (
 				goto error;
 			if (ehci->no_selective_suspend)
 				break;
+#ifdef CONFIG_USB_OTG
+			if ((hcd->self.otg_port == (wIndex + 1))
+			    && hcd->self.b_hnp_enable) {
+				otg_start_hnp(ehci->transceiver);
+				break;
+			}
+#endif
 			if (!(temp & PORT_SUSPEND))
 				break;
 			if ((temp & PORT_PE) == 0)
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 168f1a88c4d0..e9ba8e252489 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -161,6 +161,10 @@ struct ehci_hcd {			/* one per controller */
 #ifdef DEBUG
 	struct dentry		*debug_dir;
 #endif
+	/*
+	 * OTG controllers and transceivers need software interaction
+	 */
+	struct otg_transceiver	*transceiver;
 };
 
 /* convert between an HCD pointer and the corresponding EHCI_HCD */