Adding upstream version 6.6.15.upstream/6.6.15

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

1 files changed, 223 insertions, 0 deletions

diff --git a/drivers/usb/dwc3/dwc3-keystone.c b/drivers/usb/dwc3/dwc3-keystone.c
new file mode 100644
index 0000000000..8899348b62
--- /dev/null
+++ b/drivers/usb/dwc3/dwc3-keystone.c
@@ -0,0 +1,223 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * dwc3-keystone.c - Keystone Specific Glue layer
+ *
+ * Copyright (C) 2010-2013 Texas Instruments Incorporated - https://www.ti.com
+ *
+ * Author: WingMan Kwok <w-kwok2@ti.com>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/phy/phy.h>
+#include <linux/pm_runtime.h>
+
+/* USBSS register offsets */
+#define USBSS_REVISION		0x0000
+#define USBSS_SYSCONFIG		0x0010
+#define USBSS_IRQ_EOI		0x0018
+#define USBSS_IRQSTATUS_RAW_0	0x0020
+#define USBSS_IRQSTATUS_0	0x0024
+#define USBSS_IRQENABLE_SET_0	0x0028
+#define USBSS_IRQENABLE_CLR_0	0x002c
+
+/* IRQ register bits */
+#define USBSS_IRQ_EOI_LINE(n)	BIT(n)
+#define USBSS_IRQ_EVENT_ST	BIT(0)
+#define USBSS_IRQ_COREIRQ_EN	BIT(0)
+#define USBSS_IRQ_COREIRQ_CLR	BIT(0)
+
+struct dwc3_keystone {
+	struct device			*dev;
+	void __iomem			*usbss;
+	struct phy			*usb3_phy;
+};
+
+static inline u32 kdwc3_readl(void __iomem *base, u32 offset)
+{
+	return readl(base + offset);
+}
+
+static inline void kdwc3_writel(void __iomem *base, u32 offset, u32 value)
+{
+	writel(value, base + offset);
+}
+
+static void kdwc3_enable_irqs(struct dwc3_keystone *kdwc)
+{
+	u32 val;
+
+	val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
+	val |= USBSS_IRQ_COREIRQ_EN;
+	kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
+}
+
+static void kdwc3_disable_irqs(struct dwc3_keystone *kdwc)
+{
+	u32 val;
+
+	val = kdwc3_readl(kdwc->usbss, USBSS_IRQENABLE_SET_0);
+	val &= ~USBSS_IRQ_COREIRQ_EN;
+	kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, val);
+}
+
+static irqreturn_t dwc3_keystone_interrupt(int irq, void *_kdwc)
+{
+	struct dwc3_keystone	*kdwc = _kdwc;
+
+	kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_CLR_0, USBSS_IRQ_COREIRQ_CLR);
+	kdwc3_writel(kdwc->usbss, USBSS_IRQSTATUS_0, USBSS_IRQ_EVENT_ST);
+	kdwc3_writel(kdwc->usbss, USBSS_IRQENABLE_SET_0, USBSS_IRQ_COREIRQ_EN);
+	kdwc3_writel(kdwc->usbss, USBSS_IRQ_EOI, USBSS_IRQ_EOI_LINE(0));
+
+	return IRQ_HANDLED;
+}
+
+static int kdwc3_probe(struct platform_device *pdev)
+{
+	struct device		*dev = &pdev->dev;
+	struct device_node	*node = pdev->dev.of_node;
+	struct dwc3_keystone	*kdwc;
+	int			error, irq;
+
+	kdwc = devm_kzalloc(dev, sizeof(*kdwc), GFP_KERNEL);
+	if (!kdwc)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, kdwc);
+
+	kdwc->dev = dev;
+
+	kdwc->usbss = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(kdwc->usbss))
+		return PTR_ERR(kdwc->usbss);
+
+	/* PSC dependency on AM65 needs SERDES0 to be powered before USB0 */
+	kdwc->usb3_phy = devm_phy_optional_get(dev, "usb3-phy");
+	if (IS_ERR(kdwc->usb3_phy))
+		return dev_err_probe(dev, PTR_ERR(kdwc->usb3_phy), "couldn't get usb3 phy\n");
+
+	phy_pm_runtime_get_sync(kdwc->usb3_phy);
+
+	error = phy_reset(kdwc->usb3_phy);
+	if (error < 0) {
+		dev_err(dev, "usb3 phy reset failed: %d\n", error);
+		return error;
+	}
+
+	error = phy_init(kdwc->usb3_phy);
+	if (error < 0) {
+		dev_err(dev, "usb3 phy init failed: %d\n", error);
+		return error;
+	}
+
+	error = phy_power_on(kdwc->usb3_phy);
+	if (error < 0) {
+		dev_err(dev, "usb3 phy power on failed: %d\n", error);
+		phy_exit(kdwc->usb3_phy);
+		return error;
+	}
+
+	pm_runtime_enable(kdwc->dev);
+	error = pm_runtime_get_sync(kdwc->dev);
+	if (error < 0) {
+		dev_err(kdwc->dev, "pm_runtime_get_sync failed, error %d\n",
+			error);
+		goto err_irq;
+	}
+
+	/* IRQ processing not required currently for AM65 */
+	if (of_device_is_compatible(node, "ti,am654-dwc3"))
+		goto skip_irq;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		error = irq;
+		goto err_irq;
+	}
+
+	error = devm_request_irq(dev, irq, dwc3_keystone_interrupt, IRQF_SHARED,
+			dev_name(dev), kdwc);
+	if (error) {
+		dev_err(dev, "failed to request IRQ #%d --> %d\n",
+				irq, error);
+		goto err_irq;
+	}
+
+	kdwc3_enable_irqs(kdwc);
+
+skip_irq:
+	error = of_platform_populate(node, NULL, NULL, dev);
+	if (error) {
+		dev_err(&pdev->dev, "failed to create dwc3 core\n");
+		goto err_core;
+	}
+
+	return 0;
+
+err_core:
+	kdwc3_disable_irqs(kdwc);
+err_irq:
+	pm_runtime_put_sync(kdwc->dev);
+	pm_runtime_disable(kdwc->dev);
+	phy_power_off(kdwc->usb3_phy);
+	phy_exit(kdwc->usb3_phy);
+	phy_pm_runtime_put_sync(kdwc->usb3_phy);
+
+	return error;
+}
+
+static int kdwc3_remove_core(struct device *dev, void *c)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+
+	platform_device_unregister(pdev);
+
+	return 0;
+}
+
+static void kdwc3_remove(struct platform_device *pdev)
+{
+	struct dwc3_keystone *kdwc = platform_get_drvdata(pdev);
+	struct device_node *node = pdev->dev.of_node;
+
+	if (!of_device_is_compatible(node, "ti,am654-dwc3"))
+		kdwc3_disable_irqs(kdwc);
+
+	device_for_each_child(&pdev->dev, NULL, kdwc3_remove_core);
+	pm_runtime_put_sync(kdwc->dev);
+	pm_runtime_disable(kdwc->dev);
+
+	phy_power_off(kdwc->usb3_phy);
+	phy_exit(kdwc->usb3_phy);
+	phy_pm_runtime_put_sync(kdwc->usb3_phy);
+}
+
+static const struct of_device_id kdwc3_of_match[] = {
+	{ .compatible = "ti,keystone-dwc3", },
+	{ .compatible = "ti,am654-dwc3" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, kdwc3_of_match);
+
+static struct platform_driver kdwc3_driver = {
+	.probe		= kdwc3_probe,
+	.remove_new	= kdwc3_remove,
+	.driver		= {
+		.name	= "keystone-dwc3",
+		.of_match_table	= kdwc3_of_match,
+	},
+};
+
+module_platform_driver(kdwc3_driver);
+
+MODULE_ALIAS("platform:keystone-dwc3");
+MODULE_AUTHOR("WingMan Kwok <w-kwok2@ti.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("DesignWare USB3 KEYSTONE Glue Layer");