1 files changed, 190 insertions, 0 deletions

diff --git a/kernel/drivers/usb/host/ehci-spear.c b/kernel/drivers/usb/host/ehci-spear.c
new file mode 100644
index 000000000..34e14746b
--- /dev/null
+++ b/kernel/drivers/usb/host/ehci-spear.c
@@ -0,0 +1,190 @@
+/*
+* Driver for EHCI HCD on SPEAr SOC
+*
+* Copyright (C) 2010 ST Micro Electronics,
+* Deepak Sikri <deepak.sikri@st.com>
+*
+* Based on various ehci-*.c drivers
+*
+* This file is subject to the terms and conditions of the GNU General Public
+* License. See the file COPYING in the main directory of this archive for
+* more details.
+*/
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "ehci.h"
+
+#define DRIVER_DESC "EHCI SPEAr driver"
+
+static const char hcd_name[] = "SPEAr-ehci";
+
+struct spear_ehci {
+	struct clk *clk;
+};
+
+#define to_spear_ehci(hcd)	(struct spear_ehci *)(hcd_to_ehci(hcd)->priv)
+
+static struct hc_driver __read_mostly ehci_spear_hc_driver;
+
+#ifdef CONFIG_PM_SLEEP
+static int ehci_spear_drv_suspend(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	bool do_wakeup = device_may_wakeup(dev);
+
+	return ehci_suspend(hcd, do_wakeup);
+}
+
+static int ehci_spear_drv_resume(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+
+	ehci_resume(hcd, false);
+	return 0;
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
+		ehci_spear_drv_resume);
+
+static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd ;
+	struct spear_ehci *sehci;
+	struct resource *res;
+	struct clk *usbh_clk;
+	const struct hc_driver *driver = &ehci_spear_hc_driver;
+	int irq, retval;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		retval = irq;
+		goto fail;
+	}
+
+	/*
+	 * Right now device-tree probed devices don't get dma_mask set.
+	 * Since shared usb code relies on it, set it here for now.
+	 * Once we have dma capability bindings this can go away.
+	 */
+	retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+	if (retval)
+		goto fail;
+
+	usbh_clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(usbh_clk)) {
+		dev_err(&pdev->dev, "Error getting interface clock\n");
+		retval = PTR_ERR(usbh_clk);
+		goto fail;
+	}
+
+	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
+	if (!hcd) {
+		retval = -ENOMEM;
+		goto fail;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(hcd->regs)) {
+		retval = PTR_ERR(hcd->regs);
+		goto err_put_hcd;
+	}
+	hcd->rsrc_start = res->start;
+	hcd->rsrc_len = resource_size(res);
+
+	sehci = to_spear_ehci(hcd);
+	sehci->clk = usbh_clk;
+
+	/* registers start at offset 0x0 */
+	hcd_to_ehci(hcd)->caps = hcd->regs;
+
+	clk_prepare_enable(sehci->clk);
+	retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
+	if (retval)
+		goto err_stop_ehci;
+
+	device_wakeup_enable(hcd->self.controller);
+	return retval;
+
+err_stop_ehci:
+	clk_disable_unprepare(sehci->clk);
+err_put_hcd:
+	usb_put_hcd(hcd);
+fail:
+	dev_err(&pdev->dev, "init fail, %d\n", retval);
+
+	return retval ;
+}
+
+static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+	struct spear_ehci *sehci = to_spear_ehci(hcd);
+
+	usb_remove_hcd(hcd);
+
+	if (sehci->clk)
+		clk_disable_unprepare(sehci->clk);
+	usb_put_hcd(hcd);
+
+	return 0;
+}
+
+static const struct of_device_id spear_ehci_id_table[] = {
+	{ .compatible = "st,spear600-ehci", },
+	{ },
+};
+
+static struct platform_driver spear_ehci_hcd_driver = {
+	.probe		= spear_ehci_hcd_drv_probe,
+	.remove		= spear_ehci_hcd_drv_remove,
+	.shutdown	= usb_hcd_platform_shutdown,
+	.driver		= {
+		.name = "spear-ehci",
+		.bus = &platform_bus_type,
+		.pm = &ehci_spear_pm_ops,
+		.of_match_table = spear_ehci_id_table,
+	}
+};
+
+static const struct ehci_driver_overrides spear_overrides __initdata = {
+	.extra_priv_size = sizeof(struct spear_ehci),
+};
+
+static int __init ehci_spear_init(void)
+{
+	if (usb_disabled())
+		return -ENODEV;
+
+	pr_info("%s: " DRIVER_DESC "\n", hcd_name);
+
+	ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
+	return platform_driver_register(&spear_ehci_hcd_driver);
+}
+module_init(ehci_spear_init);
+
+static void __exit ehci_spear_cleanup(void)
+{
+	platform_driver_unregister(&spear_ehci_hcd_driver);
+}
+module_exit(ehci_spear_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_ALIAS("platform:spear-ehci");
+MODULE_AUTHOR("Deepak Sikri");
+MODULE_LICENSE("GPL");