Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 343 insertions, 0 deletions

diff --git a/drivers/usb/host/ehci-exynos.c b/drivers/usb/host/ehci-exynos.c
new file mode 100644
index 0000000000..f644b131cc
--- /dev/null
+++ b/drivers/usb/host/ehci-exynos.c
@@ -0,0 +1,343 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Samsung Exynos USB HOST EHCI Controller
+ *
+ * Copyright (C) 2011 Samsung Electronics Co.Ltd
+ * Author: Jingoo Han <jg1.han@samsung.com>
+ * Author: Joonyoung Shim <jy0922.shim@samsung.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/gpio/consumer.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+#include "ehci.h"
+
+#define DRIVER_DESC "EHCI Exynos driver"
+
+#define EHCI_INSNREG00(base)			(base + 0x90)
+#define EHCI_INSNREG00_ENA_INCR16		(0x1 << 25)
+#define EHCI_INSNREG00_ENA_INCR8		(0x1 << 24)
+#define EHCI_INSNREG00_ENA_INCR4		(0x1 << 23)
+#define EHCI_INSNREG00_ENA_INCRX_ALIGN		(0x1 << 22)
+#define EHCI_INSNREG00_ENABLE_DMA_BURST	\
+	(EHCI_INSNREG00_ENA_INCR16 | EHCI_INSNREG00_ENA_INCR8 |	\
+	 EHCI_INSNREG00_ENA_INCR4 | EHCI_INSNREG00_ENA_INCRX_ALIGN)
+
+static struct hc_driver __read_mostly exynos_ehci_hc_driver;
+
+#define PHY_NUMBER 3
+
+struct exynos_ehci_hcd {
+	struct clk *clk;
+	struct device_node *of_node;
+	struct phy *phy[PHY_NUMBER];
+	bool legacy_phy;
+};
+
+#define to_exynos_ehci(hcd) (struct exynos_ehci_hcd *)(hcd_to_ehci(hcd)->priv)
+
+static int exynos_ehci_get_phy(struct device *dev,
+				struct exynos_ehci_hcd *exynos_ehci)
+{
+	struct device_node *child;
+	struct phy *phy;
+	int phy_number, num_phys;
+	int ret;
+
+	/* Get PHYs for the controller */
+	num_phys = of_count_phandle_with_args(dev->of_node, "phys",
+					      "#phy-cells");
+	for (phy_number = 0; phy_number < num_phys; phy_number++) {
+		phy = devm_of_phy_get_by_index(dev, dev->of_node, phy_number);
+		if (IS_ERR(phy))
+			return PTR_ERR(phy);
+		exynos_ehci->phy[phy_number] = phy;
+	}
+	if (num_phys > 0)
+		return 0;
+
+	/* Get PHYs using legacy bindings */
+	for_each_available_child_of_node(dev->of_node, child) {
+		ret = of_property_read_u32(child, "reg", &phy_number);
+		if (ret) {
+			dev_err(dev, "Failed to parse device tree\n");
+			of_node_put(child);
+			return ret;
+		}
+
+		if (phy_number >= PHY_NUMBER) {
+			dev_err(dev, "Invalid number of PHYs\n");
+			of_node_put(child);
+			return -EINVAL;
+		}
+
+		phy = devm_of_phy_optional_get(dev, child, NULL);
+		exynos_ehci->phy[phy_number] = phy;
+		if (IS_ERR(phy)) {
+			of_node_put(child);
+			return PTR_ERR(phy);
+		}
+	}
+
+	exynos_ehci->legacy_phy = true;
+	return 0;
+}
+
+static int exynos_ehci_phy_enable(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+	int i;
+	int ret = 0;
+
+	for (i = 0; ret == 0 && i < PHY_NUMBER; i++)
+		ret = phy_power_on(exynos_ehci->phy[i]);
+	if (ret)
+		for (i--; i >= 0; i--)
+			phy_power_off(exynos_ehci->phy[i]);
+
+	return ret;
+}
+
+static void exynos_ehci_phy_disable(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+	int i;
+
+	for (i = 0; i < PHY_NUMBER; i++)
+		phy_power_off(exynos_ehci->phy[i]);
+}
+
+static void exynos_setup_vbus_gpio(struct device *dev)
+{
+	struct gpio_desc *gpio;
+	int err;
+
+	gpio = devm_gpiod_get_optional(dev, "samsung,vbus", GPIOD_OUT_HIGH);
+	err = PTR_ERR_OR_ZERO(gpio);
+	if (err)
+		dev_err(dev, "can't request ehci vbus gpio: %d\n", err);
+}
+
+static int exynos_ehci_probe(struct platform_device *pdev)
+{
+	struct exynos_ehci_hcd *exynos_ehci;
+	struct usb_hcd *hcd;
+	struct ehci_hcd *ehci;
+	struct resource *res;
+	int irq;
+	int err;
+
+	/*
+	 * 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 move to full device tree support this will vanish off.
+	 */
+	err = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+	if (err)
+		return err;
+
+	exynos_setup_vbus_gpio(&pdev->dev);
+
+	hcd = usb_create_hcd(&exynos_ehci_hc_driver,
+			     &pdev->dev, dev_name(&pdev->dev));
+	if (!hcd) {
+		dev_err(&pdev->dev, "Unable to create HCD\n");
+		return -ENOMEM;
+	}
+	exynos_ehci = to_exynos_ehci(hcd);
+
+	err = exynos_ehci_get_phy(&pdev->dev, exynos_ehci);
+	if (err)
+		goto fail_clk;
+
+	exynos_ehci->clk = devm_clk_get(&pdev->dev, "usbhost");
+
+	if (IS_ERR(exynos_ehci->clk)) {
+		dev_err(&pdev->dev, "Failed to get usbhost clock\n");
+		err = PTR_ERR(exynos_ehci->clk);
+		goto fail_clk;
+	}
+
+	err = clk_prepare_enable(exynos_ehci->clk);
+	if (err)
+		goto fail_clk;
+
+	hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
+	if (IS_ERR(hcd->regs)) {
+		err = PTR_ERR(hcd->regs);
+		goto fail_io;
+	}
+
+	hcd->rsrc_start = res->start;
+	hcd->rsrc_len = resource_size(res);
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		err = irq;
+		goto fail_io;
+	}
+
+	err = exynos_ehci_phy_enable(&pdev->dev);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to enable USB phy\n");
+		goto fail_io;
+	}
+
+	ehci = hcd_to_ehci(hcd);
+	ehci->caps = hcd->regs;
+
+	/*
+	 * Workaround: reset of_node pointer to avoid conflict between legacy
+	 * Exynos EHCI port subnodes and generic USB device bindings
+	 */
+	exynos_ehci->of_node = pdev->dev.of_node;
+	if (exynos_ehci->legacy_phy)
+		pdev->dev.of_node = NULL;
+
+	/* DMA burst Enable */
+	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
+
+	err = usb_add_hcd(hcd, irq, IRQF_SHARED);
+	if (err) {
+		dev_err(&pdev->dev, "Failed to add USB HCD\n");
+		goto fail_add_hcd;
+	}
+	device_wakeup_enable(hcd->self.controller);
+
+	platform_set_drvdata(pdev, hcd);
+
+	return 0;
+
+fail_add_hcd:
+	exynos_ehci_phy_disable(&pdev->dev);
+	pdev->dev.of_node = exynos_ehci->of_node;
+fail_io:
+	clk_disable_unprepare(exynos_ehci->clk);
+fail_clk:
+	usb_put_hcd(hcd);
+	return err;
+}
+
+static void exynos_ehci_remove(struct platform_device *pdev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(pdev);
+	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+
+	pdev->dev.of_node = exynos_ehci->of_node;
+
+	usb_remove_hcd(hcd);
+
+	exynos_ehci_phy_disable(&pdev->dev);
+
+	clk_disable_unprepare(exynos_ehci->clk);
+
+	usb_put_hcd(hcd);
+}
+
+#ifdef CONFIG_PM
+static int exynos_ehci_suspend(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+
+	bool do_wakeup = device_may_wakeup(dev);
+	int rc;
+
+	rc = ehci_suspend(hcd, do_wakeup);
+	if (rc)
+		return rc;
+
+	exynos_ehci_phy_disable(dev);
+
+	clk_disable_unprepare(exynos_ehci->clk);
+
+	return rc;
+}
+
+static int exynos_ehci_resume(struct device *dev)
+{
+	struct usb_hcd *hcd = dev_get_drvdata(dev);
+	struct exynos_ehci_hcd *exynos_ehci = to_exynos_ehci(hcd);
+	int ret;
+
+	ret = clk_prepare_enable(exynos_ehci->clk);
+	if (ret)
+		return ret;
+
+	ret = exynos_ehci_phy_enable(dev);
+	if (ret) {
+		dev_err(dev, "Failed to enable USB phy\n");
+		clk_disable_unprepare(exynos_ehci->clk);
+		return ret;
+	}
+
+	/* DMA burst Enable */
+	writel(EHCI_INSNREG00_ENABLE_DMA_BURST, EHCI_INSNREG00(hcd->regs));
+
+	ehci_resume(hcd, false);
+	return 0;
+}
+#else
+#define exynos_ehci_suspend	NULL
+#define exynos_ehci_resume	NULL
+#endif
+
+static const struct dev_pm_ops exynos_ehci_pm_ops = {
+	.suspend	= exynos_ehci_suspend,
+	.resume		= exynos_ehci_resume,
+};
+
+#ifdef CONFIG_OF
+static const struct of_device_id exynos_ehci_match[] = {
+	{ .compatible = "samsung,exynos4210-ehci" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, exynos_ehci_match);
+#endif
+
+static struct platform_driver exynos_ehci_driver = {
+	.probe		= exynos_ehci_probe,
+	.remove_new	= exynos_ehci_remove,
+	.shutdown	= usb_hcd_platform_shutdown,
+	.driver = {
+		.name	= "exynos-ehci",
+		.pm	= &exynos_ehci_pm_ops,
+		.of_match_table = of_match_ptr(exynos_ehci_match),
+	}
+};
+static const struct ehci_driver_overrides exynos_overrides __initconst = {
+	.extra_priv_size = sizeof(struct exynos_ehci_hcd),
+};
+
+static int __init ehci_exynos_init(void)
+{
+	if (usb_disabled())
+		return -ENODEV;
+
+	ehci_init_driver(&exynos_ehci_hc_driver, &exynos_overrides);
+	return platform_driver_register(&exynos_ehci_driver);
+}
+module_init(ehci_exynos_init);
+
+static void __exit ehci_exynos_cleanup(void)
+{
+	platform_driver_unregister(&exynos_ehci_driver);
+}
+module_exit(ehci_exynos_cleanup);
+
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_ALIAS("platform:exynos-ehci");
+MODULE_AUTHOR("Jingoo Han");
+MODULE_AUTHOR("Joonyoung Shim");
+MODULE_LICENSE("GPL v2");