[12/15] Introduce Cadence USBSSP DRD Driver - added usbssp-plat.c file

Commit Message

Pawel Laszczak July 3, 2018, 7:57 p.m. UTC

Signed-off-by: Laszczak Pawel <[e-mail]>
---
 drivers/usb/usbssp/usbssp-plat.c | 186 +++++++++++++++++++++++++++++++
 1 file changed, 186 insertions(+)
 create mode 100644 drivers/usb/usbssp/usbssp-plat.c

Patch

diff --git a/drivers/usb/usbssp/usbssp-plat.c b/drivers/usb/usbssp/usbssp-plat.c
new file mode 100644
index 000000000000..91abd7a00907
--- /dev/null
+++ b/drivers/usb/usbssp/usbssp-plat.c
@@ -0,0 +1,186 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USBSSP device controller driver
+ *
+ * Copyright (C) 2018 Cadence.
+ *
+ * Author: Pawel Laszczak
+ * Some code borrowed from the Linux XHCI driver.
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/usb/phy.h>
+#include <linux/slab.h>
+#include <linux/acpi.h>
+
+#include "gadget.h"
+
+#define DRIVER_AUTHOR "Pawel Laszczak"
+#define DRIVER_DESC "USBSSP Device Controller (USBSSP) Driver"
+
+#ifdef CONFIG_OF
+
+static const struct of_device_id usbssp_dev_of_match[] = {
+	{
+		.compatible = "Cadence, usbssp-dev",
+	},
+	{},
+};
+MODULE_DEVICE_TABLE(of, usbssp_dev_of_match);
+#endif
+
+int usbssp_is_platform(void)
+{
+	return 1;
+}
+
+static int usbssp_plat_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct usbssp_udc *usbssp_data;
+	int ret = 0;
+	int irq;
+	struct device *sysdev;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "Incorrect IRQ number\n");
+		return -ENODEV;
+	}
+
+	usbssp_data = devm_kzalloc(dev, sizeof(*usbssp_data), GFP_KERNEL);
+	if (!usbssp_data)
+		return -ENOMEM;
+
+	for (sysdev = &pdev->dev; sysdev; sysdev = sysdev->parent) {
+		if (is_of_node(sysdev->fwnode) ||
+		    is_acpi_device_node(sysdev->fwnode))
+			break;
+#ifdef CONFIG_PCI
+		else if (sysdev->bus == &pci_bus_type)
+			break;
+#endif
+	}
+
+	if (!sysdev)
+		sysdev = &pdev->dev;
+
+	/* Try to set 64-bit DMA first */
+	if (WARN_ON(!dev->dma_mask))
+		/* Platform did not initialize dma_mask */
+		ret = dma_coerce_mask_and_coherent(dev,
+				DMA_BIT_MASK(64));
+	else
+		ret = dma_set_mask_and_coherent(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(dev, DMA_BIT_MASK(32));
+		if (ret)
+			return ret;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	usbssp_data->regs = devm_ioremap_resource(dev, res);
+
+	if (IS_ERR(usbssp_data->regs)) {
+		ret = PTR_ERR(usbssp_data->regs);
+		return ret;
+	}
+
+	usbssp_data->rsrc_start = res->start;
+	usbssp_data->rsrc_len = resource_size(res);
+
+	ret = devm_request_irq(dev, irq, usbssp_irq, IRQF_SHARED,
+			dev_name(dev), usbssp_data);
+
+	if (ret < 0)
+		return ret;
+
+	usbssp_data->irq = irq;
+	usbssp_data->dev = dev;
+	platform_set_drvdata(pdev, usbssp_data);
+	ret = usbssp_gadget_init(usbssp_data);
+
+	return ret;
+}
+
+static int usbssp_plat_remove(struct platform_device *pdev)
+{
+	int ret = 0;
+	struct usbssp_udc *usbssp_data;
+
+	usbssp_data = (struct usbssp_udc *)platform_get_drvdata(pdev);
+	ret = usbssp_gadget_exit(usbssp_data);
+	return ret;
+
+}
+
+static int __maybe_unused usbssp_plat_suspend(struct device *dev)
+{
+	struct usbssp_udc *usbssp_data = dev_get_drvdata(dev);
+
+	return usbssp_suspend(usbssp_data, device_may_wakeup(dev));
+}
+
+static int __maybe_unused usbssp_plat_resume(struct device *dev)
+{
+	struct usbssp_udc *usbssp_data = dev_get_drvdata(dev);
+
+	return usbssp_resume(usbssp_data, 0);
+}
+
+static int __maybe_unused usbssp_plat_runtime_suspend(struct device *dev)
+{
+	struct usbssp_udc *usbssp_data = dev_get_drvdata(dev);
+
+	return usbssp_suspend(usbssp_data, true);
+}
+
+static int __maybe_unused usbssp_plat_runtime_resume(struct device *dev)
+{
+	struct usbssp_udc *usbssp_data = dev_get_drvdata(dev);
+
+	return usbssp_resume(usbssp_data, 0);
+}
+
+static const struct dev_pm_ops usbssp_plat_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(usbssp_plat_suspend, usbssp_plat_resume)
+
+	SET_RUNTIME_PM_OPS(usbssp_plat_runtime_suspend,
+			usbssp_plat_runtime_resume,
+			NULL)
+};
+
+static struct platform_driver usbssp_driver = {
+	.probe	= usbssp_plat_probe,
+	.remove	= usbssp_plat_remove,
+	.driver	= {
+		.name = "usbssp-dev",
+		.pm = &usbssp_plat_pm_ops,
+		.of_match_table = of_match_ptr(usbssp_dev_of_match),
+	},
+};
+
+static int __init usbssp_plat_init(void)
+{
+	return platform_driver_register(&usbssp_driver);
+}
+module_init(usbssp_plat_init);
+
+static void __exit usbssp_plat_exit(void)
+{
+	platform_driver_unregister(&usbssp_driver);
+}
+module_exit(usbssp_plat_exit);
+
+MODULE_ALIAS("platform:usbss-gadget");
+MODULE_DESCRIPTION("USBSSP' Device Controller (USBSSP) Driver");
+MODULE_LICENSE("GPL");