1 files changed, 500 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
new file mode 100644
index 000000000000..a0917a135c5d
--- /dev/null
+++ b/drivers/usb/host/xhci-plat.c
@@ -0,0 +1,500 @@
+/*
+ * xhci-plat.c - xHCI host controller driver platform Bus Glue.
+ *
+ * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
+ * Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+ *
+ * A lot of code borrowed from the Linux xHCI driver.
+ *
+ * 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.
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/usb/phy.h>
+#include <linux/slab.h>
+#include <linux/usb/xhci_pdriver.h>
+#include <linux/acpi.h>
+
+#include "xhci.h"
+#include "xhci-mvebu.h"
+#include "xhci-rcar.h"
+
+static struct hc_driver __read_mostly xhci_plat_hc_driver;
+
+static int xhci_plat_setup(struct usb_hcd *hcd);
+static int xhci_plat_start(struct usb_hcd *hcd);
+
+static const struct xhci_driver_overrides xhci_plat_overrides __initconst = {
+	.extra_priv_size = sizeof(struct xhci_hcd),
+	.reset = xhci_plat_setup,
+	.start = xhci_plat_start,
+};
+
+static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
+{
+	struct device_node *node = dev->of_node;
+	struct usb_xhci_pdata *pdata = dev_get_platdata(dev);
+
+	/*
+	 * As of now platform drivers don't provide MSI support so we ensure
+	 * here that the generic code does not try to make a pci_dev from our
+	 * dev struct in order to setup MSI
+	 */
+	xhci->quirks |= XHCI_PLAT;
+
+	if ((node && of_property_read_bool(node, "usb3-lpm-capable")) ||
+			(pdata && pdata->usb3_lpm_capable))
+		xhci->quirks |= XHCI_LPM_SUPPORT;
+}
+
+/* called during probe() after chip reset completes */
+static int xhci_plat_setup(struct usb_hcd *hcd)
+{
+	struct device_node *of_node = hcd->self.controller->of_node;
+	int ret;
+
+	if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
+	    of_device_is_compatible(of_node, "renesas,xhci-r8a7791")) {
+		ret = xhci_rcar_init_quirk(hcd);
+		if (ret)
+			return ret;
+	}
+
+	return xhci_gen_setup(hcd, xhci_plat_quirks);
+}
+
+static int xhci_plat_start(struct usb_hcd *hcd)
+{
+	struct device_node *of_node = hcd->self.controller->of_node;
+
+	if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
+	    of_device_is_compatible(of_node, "renesas,xhci-r8a7791"))
+		xhci_rcar_start(hcd);
+
+	return xhci_run(hcd);
+}
+
+static ssize_t config_imod_store(struct device *pdev,
+		struct device_attribute *attr, const char *buff, size_t size)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(pdev);
+	struct xhci_hcd *xhci;
+	u32 temp;
+	u32 imod;
+	unsigned long flags;
+
+	if (kstrtouint(buff, 10, &imod) != 1)
+		return 0;
+
+	imod &= ER_IRQ_INTERVAL_MASK;
+	xhci = hcd_to_xhci(hcd);
+
+	if (xhci->shared_hcd->state == HC_STATE_SUSPENDED
+		&& hcd->state == HC_STATE_SUSPENDED)
+		return -EACCES;
+
+	spin_lock_irqsave(&xhci->lock, flags);
+	temp = readl_relaxed(&xhci->ir_set->irq_control);
+	temp &= ~ER_IRQ_INTERVAL_MASK;
+	temp |= imod;
+	writel_relaxed(temp, &xhci->ir_set->irq_control);
+	spin_unlock_irqrestore(&xhci->lock, flags);
+
+	return size;
+}
+
+static ssize_t config_imod_show(struct device *pdev,
+		struct device_attribute *attr, char *buff)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(pdev);
+	struct xhci_hcd *xhci;
+	u32 temp;
+	unsigned long flags;
+
+	xhci = hcd_to_xhci(hcd);
+
+	if (xhci->shared_hcd->state == HC_STATE_SUSPENDED
+		&& hcd->state == HC_STATE_SUSPENDED)
+		return -EACCES;
+
+	spin_lock_irqsave(&xhci->lock, flags);
+	temp = readl_relaxed(&xhci->ir_set->irq_control) &
+			ER_IRQ_INTERVAL_MASK;
+	spin_unlock_irqrestore(&xhci->lock, flags);
+
+	return snprintf(buff, PAGE_SIZE, "%08u\n", temp);
+}
+
+static DEVICE_ATTR(config_imod, S_IRUGO | S_IWUSR,
+		config_imod_show, config_imod_store);
+
+static int xhci_plat_probe(struct platform_device *pdev)
+{
+	struct usb_xhci_pdata	*pdata = dev_get_platdata(&pdev->dev);
+	const struct hc_driver	*driver;
+	struct xhci_hcd		*xhci;
+	struct resource         *res;
+	struct usb_hcd		*hcd;
+	struct clk              *clk;
+	int			ret;
+	int			irq;
+	u32			temp, imod;
+	unsigned long		flags;
+
+	if (usb_disabled())
+		return -ENODEV;
+
+	driver = &xhci_plat_hc_driver;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	/* Try to set 64-bit DMA first */
+	if (WARN_ON(!pdev->dev.dma_mask))
+		/* Platform did not initialize dma_mask */
+		ret = dma_coerce_mask_and_coherent(&pdev->dev,
+						   DMA_BIT_MASK(64));
+	else
+		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+
+	/* If seting 64-bit DMA mask fails, fall back to 32-bit DMA mask */
+	if (ret) {
+		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+		if (ret)
+			return ret;
+	}
+
+	hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
+	if (!hcd)
+		return -ENOMEM;
+
+	hcd_to_bus(hcd)->skip_resume = true;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	hcd->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(hcd->regs)) {
+		ret = PTR_ERR(hcd->regs);
+		goto put_hcd;
+	}
+
+	hcd->rsrc_start = res->start;
+	hcd->rsrc_len = resource_size(res);
+
+	/*
+	 * Not all platforms have a clk so it is not an error if the
+	 * clock does not exists.
+	 */
+	clk = devm_clk_get(&pdev->dev, NULL);
+	if (!IS_ERR(clk)) {
+		ret = clk_prepare_enable(clk);
+		if (ret)
+			goto put_hcd;
+	} else if (PTR_ERR(clk) == -EPROBE_DEFER) {
+		ret = -EPROBE_DEFER;
+		goto put_hcd;
+	}
+
+	if (pdev->dev.parent)
+		pm_runtime_resume(pdev->dev.parent);
+
+	pm_runtime_use_autosuspend(&pdev->dev);
+	pm_runtime_set_autosuspend_delay(&pdev->dev, 1000);
+	pm_runtime_set_active(&pdev->dev);
+	pm_runtime_enable(&pdev->dev);
+	pm_runtime_get_noresume(&pdev->dev);
+
+	if (of_device_is_compatible(pdev->dev.of_node,
+				    "marvell,armada-375-xhci") ||
+	    of_device_is_compatible(pdev->dev.of_node,
+				    "marvell,armada-380-xhci")) {
+		ret = xhci_mvebu_mbus_init_quirk(pdev);
+		if (ret)
+			goto disable_clk;
+	}
+
+	device_wakeup_enable(hcd->self.controller);
+
+	xhci = hcd_to_xhci(hcd);
+	xhci->clk = clk;
+	xhci->main_hcd = hcd;
+	xhci->shared_hcd = usb_create_shared_hcd(driver, &pdev->dev,
+			dev_name(&pdev->dev), hcd);
+	if (!xhci->shared_hcd) {
+		ret = -ENOMEM;
+		goto disable_clk;
+	}
+
+	hcd_to_bus(xhci->shared_hcd)->skip_resume = true;
+
+	hcd->usb_phy = devm_usb_get_phy_by_phandle(&pdev->dev, "usb-phy", 0);
+	if (IS_ERR(hcd->usb_phy)) {
+		ret = PTR_ERR(hcd->usb_phy);
+		if (ret == -EPROBE_DEFER)
+			goto put_usb3_hcd;
+		hcd->usb_phy = NULL;
+	} else {
+		ret = usb_phy_init(hcd->usb_phy);
+		if (ret)
+			goto put_usb3_hcd;
+	}
+
+	ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
+	if (ret)
+		goto disable_usb_phy;
+
+	device_wakeup_enable(&hcd->self.root_hub->dev);
+
+	if (HCC_MAX_PSA(xhci->hcc_params) >= 4)
+		xhci->shared_hcd->can_do_streams = 1;
+
+	ret = usb_add_hcd(xhci->shared_hcd, irq, IRQF_SHARED);
+	if (ret)
+		goto dealloc_usb2_hcd;
+
+	device_wakeup_enable(&xhci->shared_hcd->self.root_hub->dev);
+
+	/* override imod interval if specified */
+	if (pdata && pdata->imod_interval) {
+		imod = pdata->imod_interval & ER_IRQ_INTERVAL_MASK;
+		spin_lock_irqsave(&xhci->lock, flags);
+		temp = readl_relaxed(&xhci->ir_set->irq_control);
+		temp &= ~ER_IRQ_INTERVAL_MASK;
+		temp |= imod;
+		writel_relaxed(temp, &xhci->ir_set->irq_control);
+		spin_unlock_irqrestore(&xhci->lock, flags);
+		dev_dbg(&pdev->dev, "%s: imod set to %u\n", __func__, imod);
+	}
+
+	ret = device_create_file(&pdev->dev, &dev_attr_config_imod);
+	if (ret)
+		dev_err(&pdev->dev, "%s: unable to create imod sysfs entry\n",
+					__func__);
+	
+	pm_runtime_mark_last_busy(&pdev->dev);
+	pm_runtime_put_autosuspend(&pdev->dev);
+
+	return 0;
+
+
+dealloc_usb2_hcd:
+	usb_remove_hcd(hcd);
+
+disable_usb_phy:
+	usb_phy_shutdown(hcd->usb_phy);
+
+put_usb3_hcd:
+	usb_put_hcd(xhci->shared_hcd);
+
+disable_clk:
+	pm_runtime_put_noidle(&pdev->dev);
+	pm_runtime_disable(&pdev->dev);
+	if (!IS_ERR(clk))
+		clk_disable_unprepare(clk);
+
+put_hcd:
+	usb_put_hcd(hcd);
+
+	return ret;
+}
+
+static int xhci_plat_remove(struct platform_device *dev)
+{
+	struct usb_hcd	*hcd = platform_get_drvdata(dev);
+	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
+	struct clk *clk = xhci->clk;
+
+	device_remove_file(&dev->dev, &dev_attr_config_imod);
+	xhci->xhc_state |= XHCI_STATE_REMOVING;
+	usb_remove_hcd(xhci->shared_hcd);
+	usb_phy_shutdown(hcd->usb_phy);
+
+	usb_remove_hcd(hcd);
+	usb_put_hcd(xhci->shared_hcd);
+
+	if (!IS_ERR(clk))
+		clk_disable_unprepare(clk);
+	usb_put_hcd(hcd);
+
+	pm_runtime_set_suspended(&dev->dev);
+	pm_runtime_disable(&dev->dev);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int xhci_plat_suspend(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+	if (!xhci)
+		return 0;
+
+	dev_dbg(dev, "xhci-plat PM suspend\n");
+
+	return xhci_suspend(xhci, true);
+}
+
+static int xhci_plat_resume(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+	if (!xhci)
+		return 0;
+
+	dev_dbg(dev, "xhci-plat PM resume\n");
+
+	return (!hcd_to_bus(hcd)->skip_resume) ? xhci_resume(xhci, false) : 0;
+}
+#endif
+
+#ifdef CONFIG_PM
+static int xhci_plat_runtime_idle(struct device *dev)
+{
+	/*
+	 * When pm_runtime_put_autosuspend() is called on this device,
+	 * after this idle callback returns the PM core will schedule the
+	 * autosuspend if there is any remaining time until expiry. However,
+	 * when reaching this point because the child_count becomes 0, the
+	 * core does not honor autosuspend in that case and results in
+	 * idle/suspend happening immediately. In order to have a delay
+	 * before suspend we have to call pm_runtime_autosuspend() manually.
+	 */
+	pm_runtime_mark_last_busy(dev);
+	pm_runtime_autosuspend(dev);
+	return -EBUSY;
+}
+
+static int xhci_plat_pm_freeze(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+	if (!xhci)
+		return 0;
+
+	dev_dbg(dev, "xhci-plat freeze\n");
+
+	return xhci_suspend(xhci, false);
+}
+
+static int xhci_plat_pm_restore(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+	int ret;
+
+	if (!xhci)
+		return 0;
+
+	dev_dbg(dev, "xhci-plat restore\n");
+
+	ret = xhci_resume(xhci, true);
+	pm_runtime_disable(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+	pm_runtime_mark_last_busy(dev);
+
+	return ret;
+}
+
+static int xhci_plat_runtime_suspend(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+
+	if (!xhci)
+		return 0;
+
+	dev_dbg(dev, "xhci-plat runtime suspend\n");
+
+	return xhci_suspend(xhci, true);
+}
+
+static int xhci_plat_runtime_resume(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	struct xhci_hcd *xhci = hcd_to_xhci(hcd);
+	int ret;
+
+	if (!xhci)
+		return 0;
+
+	dev_dbg(dev, "xhci-plat runtime resume\n");
+
+	ret = xhci_resume(xhci, false);
+	pm_runtime_mark_last_busy(dev);
+
+	return ret;
+}
+
+static const struct dev_pm_ops xhci_plat_pm_ops = {
+	.suspend	= xhci_plat_suspend,
+	.resume		= xhci_plat_resume,
+	.freeze		= xhci_plat_pm_freeze,
+	.restore	= xhci_plat_pm_restore,
+	.thaw		= xhci_plat_pm_restore,
+	SET_RUNTIME_PM_OPS(xhci_plat_runtime_suspend, xhci_plat_runtime_resume,
+			   xhci_plat_runtime_idle)
+};
+#define DEV_PM_OPS	(&xhci_plat_pm_ops)
+#else
+#define DEV_PM_OPS	NULL
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_OF
+static const struct of_device_id usb_xhci_of_match[] = {
+	{ .compatible = "generic-xhci" },
+	{ .compatible = "xhci-platform" },
+	{ .compatible = "marvell,armada-375-xhci"},
+	{ .compatible = "marvell,armada-380-xhci"},
+	{ .compatible = "renesas,xhci-r8a7790"},
+	{ .compatible = "renesas,xhci-r8a7791"},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
+#endif
+
+static const struct acpi_device_id usb_xhci_acpi_match[] = {
+	/* XHCI-compliant USB Controller */
+	{ "PNP0D10", },
+	{ }
+};
+MODULE_DEVICE_TABLE(acpi, usb_xhci_acpi_match);
+
+static struct platform_driver usb_xhci_driver = {
+	.probe	= xhci_plat_probe,
+	.remove	= xhci_plat_remove,
+	.shutdown = usb_hcd_platform_shutdown,
+	.driver	= {
+		.name = "xhci-hcd",
+		.pm = DEV_PM_OPS,
+		.of_match_table = of_match_ptr(usb_xhci_of_match),
+		.acpi_match_table = ACPI_PTR(usb_xhci_acpi_match),
+	},
+};
+MODULE_ALIAS("platform:xhci-hcd");
+
+static int __init xhci_plat_init(void)
+{
+	xhci_init_driver(&xhci_plat_hc_driver, &xhci_plat_overrides);
+	return platform_driver_register(&usb_xhci_driver);
+}
+module_init(xhci_plat_init);
+
+static void __exit xhci_plat_exit(void)
+{
+	platform_driver_unregister(&usb_xhci_driver);
+}
+module_exit(xhci_plat_exit);
+
+MODULE_DESCRIPTION("xHCI Platform Host Controller Driver");
+MODULE_LICENSE("GPL");