Initial import

1 files changed, 233 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-msm.c b/drivers/usb/host/ehci-msm.c
new file mode 100644
index 000000000..275c92e53
--- /dev/null
+++ b/drivers/usb/host/ehci-msm.c
@@ -0,0 +1,233 @@
+/* ehci-msm.c - HSUSB Host Controller Driver Implementation
+ *
+ * Copyright (c) 2008-2011, Code Aurora Forum. All rights reserved.
+ *
+ * Partly derived from ehci-fsl.c and ehci-hcd.c
+ * Copyright (c) 2000-2004 by David Brownell
+ * Copyright (c) 2005 MontaVista Software
+ *
+ * All source code in this file is licensed under the following license except
+ * where indicated.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * See the GNU General Public License for more details.
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you can find it at http://www.fsf.org
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/usb/otg.h>
+#include <linux/usb/msm_hsusb_hw.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "ehci.h"
+
+#define MSM_USB_BASE (hcd->regs)
+
+#define DRIVER_DESC "Qualcomm On-Chip EHCI Host Controller"
+
+static const char hcd_name[] = "ehci-msm";
+static struct hc_driver __read_mostly msm_hc_driver;
+
+static int ehci_msm_reset(struct usb_hcd *hcd)
+{
+	struct ehci_hcd *ehci = hcd_to_ehci(hcd);
+	int retval;
+
+	ehci->caps = USB_CAPLENGTH;
+	hcd->has_tt = 1;
+
+	retval = ehci_setup(hcd);
+	if (retval)
+		return retval;
+
+	/* bursts of unspecified length. */
+	writel(0, USB_AHBBURST);
+	/* Use the AHB transactor */
+	writel(0, USB_AHBMODE);
+	/* Disable streaming mode and select host mode */
+	writel(0x13, USB_USBMODE);
+
+	return 0;
+}
+
+static int ehci_msm_probe(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd;
+	struct resource *res;
+	struct usb_phy *phy;
+	int ret;
+
+	dev_dbg(&pdev->dev, "ehci_msm proble\n");
+
+	hcd = usb_create_hcd(&msm_hc_driver, &pdev->dev, dev_name(&pdev->dev));
+	if (!hcd) {
+		dev_err(&pdev->dev, "Unable to create HCD\n");
+		return  -ENOMEM;
+	}
+
+	hcd->irq = platform_get_irq(pdev, 0);
+	if (hcd->irq < 0) {
+		dev_err(&pdev->dev, "Unable to get IRQ resource\n");
+		ret = hcd->irq;
+		goto put_hcd;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "Unable to get memory resource\n");
+		ret = -ENODEV;
+		goto put_hcd;
+	}
+
+	hcd->rsrc_start = res->start;
+	hcd->rsrc_len = resource_size(res);
+	hcd->regs = devm_ioremap(&pdev->dev, hcd->rsrc_start, hcd->rsrc_len);
+	if (!hcd->regs) {
+		dev_err(&pdev->dev, "ioremap failed\n");
+		ret = -ENOMEM;
+		goto put_hcd;
+	}
+
+	/*
+	 * OTG driver takes care of PHY initialization, clock management,
+	 * powering up VBUS, mapping of registers address space and power
+	 * management.
+	 */
+	if (pdev->dev.of_node)
+		phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
+	else
+		phy = devm_usb_get_phy(&pdev->dev, USB_PHY_TYPE_USB2);
+
+	if (IS_ERR(phy)) {
+		dev_err(&pdev->dev, "unable to find transceiver\n");
+		ret = -EPROBE_DEFER;
+		goto put_hcd;
+	}
+
+	ret = otg_set_host(phy->otg, &hcd->self);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to register with transceiver\n");
+		goto put_hcd;
+	}
+
+	hcd->usb_phy = phy;
+	device_init_wakeup(&pdev->dev, 1);
+	/*
+	 * OTG device parent of HCD takes care of putting
+	 * hardware into low power mode.
+	 */
+	pm_runtime_no_callbacks(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+
+	/* FIXME: need to call usb_add_hcd() here? */
+
+	return 0;
+
+put_hcd:
+	usb_put_hcd(hcd);
+
+	return ret;
+}
+
+static int ehci_msm_remove(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+
+	device_init_wakeup(&pdev->dev, 0);
+	pm_runtime_disable(&pdev->dev);
+	pm_runtime_set_suspended(&pdev->dev);
+
+	otg_set_host(hcd->usb_phy->otg, NULL);
+
+	/* FIXME: need to call usb_remove_hcd() here? */
+
+	usb_put_hcd(hcd);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int ehci_msm_pm_suspend(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	bool do_wakeup = device_may_wakeup(dev);
+
+	dev_dbg(dev, "ehci-msm PM suspend\n");
+
+	return ehci_suspend(hcd, do_wakeup);
+}
+
+static int ehci_msm_pm_resume(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+	dev_dbg(dev, "ehci-msm PM resume\n");
+	ehci_resume(hcd, false);
+
+	return 0;
+}
+#else
+#define ehci_msm_pm_suspend	NULL
+#define ehci_msm_pm_resume	NULL
+#endif
+
+static const struct dev_pm_ops ehci_msm_dev_pm_ops = {
+	.suspend         = ehci_msm_pm_suspend,
+	.resume          = ehci_msm_pm_resume,
+};
+
+static const struct of_device_id msm_ehci_dt_match[] = {
+	{ .compatible = "qcom,ehci-host", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, msm_ehci_dt_match);
+
+static struct platform_driver ehci_msm_driver = {
+	.probe	= ehci_msm_probe,
+	.remove	= ehci_msm_remove,
+	.driver = {
+		   .name = "msm_hsusb_host",
+		   .pm = &ehci_msm_dev_pm_ops,
+		   .of_match_table = msm_ehci_dt_match,
+	},
+};
+
+static const struct ehci_driver_overrides msm_overrides __initdata = {
+	.reset = ehci_msm_reset,
+};
+
+static int __init ehci_msm_init(void)
+{
+	if (usb_disabled())
+		return -ENODEV;
+
+	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+	ehci_init_driver(&msm_hc_driver, &msm_overrides);
+	return platform_driver_register(&ehci_msm_driver);
+}
+module_init(ehci_msm_init);
+
+static void __exit ehci_msm_cleanup(void)
+{
+	platform_driver_unregister(&ehci_msm_driver);
+}
+module_exit(ehci_msm_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_ALIAS("platform:msm-ehci");
+MODULE_LICENSE("GPL");