[PATCH 13/15] Introduce Cadence USBSSP DRD Driver - added usbssp-pci-of-wrap.c file This file implements wrapper between PCI adn platform driver.

[Pawel Laszczak <pawell@cadence.com>]

Signed-off-by: Laszczak Pawel <pawell@cadence.com>
---
 drivers/usb/usbssp/usbssp-pci-of-wrap.c | 229 ++++++++++++++++++++++++
 1 file changed, 229 insertions(+)
 create mode 100644 drivers/usb/usbssp/usbssp-pci-of-wrap.c

diff --git a/drivers/usb/usbssp/usbssp-pci-of-wrap.c b/drivers/usb/usbssp/usbssp-pci-of-wrap.c
new file mode 100644
index 000000000000..a8511f062133
--- /dev/null
+++ b/drivers/usb/usbssp/usbssp-pci-of-wrap.c
@@ -0,0 +1,229 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * USBSSP device controller driver - PCIe wrapper
+ *
+ * Copyright (C) 2018 Cadence.
+ *
+ * Author: Pawel Laszczak
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+
+
+struct usbssp_pci {
+	struct platform_device *plat_cdns;
+	struct pci_dev *otg;
+	struct pci_dev *hg_dev;
+	struct resource res[5];
+};
+
+struct usbssp_pci usbssp;
+
+/**
+ * usbssp_pci_probe - Probe function for Cadence USB wrapper driver
+ * @pdev: platform device object
+ * @id: pci device id
+ *
+ * Returns 0 on success otherwise negative errno
+ */
+static int usbssp_pci_probe(struct pci_dev *pdev,
+			    const struct pci_device_id *id)
+{
+	int rv = 0;
+	struct platform_device *usbssp_plat;
+
+	if (pdev->devfn > 1)
+		return 0;
+
+	if (!id)
+		return -EINVAL;
+
+	if (pcim_enable_device(pdev) < 0) {
+		dev_err(&pdev->dev, "failed to enable PCI device\n");
+		return -ENOMEM;
+	}
+
+	pci_set_master(pdev);
+
+	/*
+	 * function 0: device(BAR_2) + host(BAR_0)
+	 * function 1: otg(BAR_0))cdns3_remove_roles
+	 */
+	if (pdev->devfn == 0 || pdev->devfn == 1) {
+		if (!usbssp.plat_cdns) {
+			usbssp_plat = platform_device_alloc("usbssp-dev",
+					PLATFORM_DEVID_AUTO);
+			memset(usbssp.res, 0x00, sizeof(struct resource) *
+					ARRAY_SIZE(usbssp.res));
+			usbssp.plat_cdns = usbssp_plat;
+
+			if (!usbssp_plat->dev.dma_mask) {
+				dma_coerce_mask_and_coherent(&usbssp_plat->dev,
+					DMA_BIT_MASK(32));
+			}
+		}
+	} else
+		return -EINVAL;
+
+	/* for GADGET device function number is 0 */
+	if (pdev->devfn == 0) {
+		usbssp.hg_dev = pdev;
+		//device resource
+		usbssp.res[0].start = pci_resource_start(pdev, 2);
+		usbssp.res[0].end = pci_resource_end(pdev, 2);
+		usbssp.res[0].name = "usbssp-dev-regs";
+		usbssp.res[0].flags = IORESOURCE_MEM;
+
+		/* Interrupt resource*/
+		usbssp.res[1].start = pdev->irq;
+		usbssp.res[1].name = "usbssp-dev-irq";
+		usbssp.res[1].flags = IORESOURCE_IRQ;
+	} else if (pdev->devfn == 1) {
+		usbssp.otg = pdev;
+		//OTG
+		usbssp.res[2].start = pci_resource_start(pdev, 0);
+		usbssp.res[2].end =   pci_resource_end(pdev, 0);
+		usbssp.res[2].name = "otg";
+		usbssp.res[2].flags = IORESOURCE_MEM;
+
+		usbssp.res[3].start = pci_resource_start(pdev, 1);
+		usbssp.res[3].end =   pci_resource_end(pdev, 1);
+		usbssp.res[3].name = "debug1";
+		usbssp.res[3].flags = IORESOURCE_MEM;
+
+		usbssp.res[4].start = pci_resource_start(pdev, 2);
+		usbssp.res[4].end =   pci_resource_end(pdev, 2);
+		usbssp.res[4].name = "debug2";
+		usbssp.res[4].flags = IORESOURCE_MEM;
+	} else {
+		return -EIO;
+	}
+
+	if (usbssp.otg && usbssp.hg_dev) {
+
+		struct pci_dev *pci_hg = usbssp.hg_dev;
+		struct platform_device *plat_dev = usbssp.plat_cdns;
+
+		rv = platform_device_add_resources(plat_dev, usbssp.res,
+				ARRAY_SIZE(usbssp.res));
+		if (rv) {
+			dev_err(&plat_dev->dev,
+				"couldn't add resources to cdns device\n");
+			return rv;
+		}
+
+		rv = platform_device_add(plat_dev);
+
+		if (rv) {
+			dev_err(&pci_hg->dev,
+				"failed to register cdns device\n");
+			platform_device_put(plat_dev);
+			return rv;
+		}
+	}
+
+	pci_set_drvdata(pdev, &usbssp);
+
+	return rv;
+}
+
+void usbssp_pci_remove(struct pci_dev *pdev)
+{
+	struct usbssp_pci *usbssp = pci_get_drvdata(pdev);
+
+	if (pdev->devfn > 1)
+		return;
+
+	if (pdev->devfn == 1)
+		usbssp->otg = NULL;
+	else if (pdev->devfn == 0)
+		usbssp->hg_dev = NULL;
+
+	if (!usbssp->hg_dev && !usbssp->otg)
+		platform_device_unregister(usbssp->plat_cdns);
+}
+
+#if CONFIG_PM || CONFIG_PM_SLEEP
+static int usbssp_generic_suspend(struct usbssp_pci *usbssp, int param)
+{
+	/*TODO*/
+	return -ENOSYS;
+}
+
+static int usbssp_generic_resume(struct usbssp_pci *usbssp, int param)
+{
+	/*TODO*/
+	return -ENOSYS;
+}
+
+#endif /*CONFIG_PM || CONFIG_PM_SLEEP*/
+
+#ifdef CONFIG_PM
+static int usbssp_runtime_suspend(struct device *dev)
+{
+	struct usbssp_pci		*usbssp = dev_get_drvdata(dev);
+
+	return usbssp_generic_suspend(usbssp, 0);
+}
+
+static int usbssp_runtime_resume(struct device *dev)
+{
+	struct usbssp_pci		*usbssp = dev_get_drvdata(dev);
+
+	return usbssp_generic_resume(usbssp, 0);
+}
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_PM_SLEEP
+static int usbssp_pci_suspend(struct device *dev)
+{
+	struct usbssp_pci		*usbssp = dev_get_drvdata(dev);
+
+	return usbssp_generic_suspend(usbssp, 0);
+}
+
+static int usbssp_pci_resume(struct device *dev)
+{
+	struct usbssp_pci		*usbssp = dev_get_drvdata(dev);
+
+	return usbssp_generic_resume(usbssp, 0);
+}
+#endif /* CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops usbssp_pci_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(usbssp_runtime_suspend, usbssp_runtime_resume)
+	SET_RUNTIME_PM_OPS(usbssp_pci_suspend, usbssp_pci_resume,
+		NULL)
+};
+
+#define PCI_VENDOR_ID_CDZ 0x17CD
+static const struct pci_device_id usbssp_pci_ids[] = {
+	{PCI_VDEVICE(CDZ, 0x0100), },
+	{ /* terminate list */}
+};
+
+MODULE_DEVICE_TABLE(pci, usbssp_pci_ids);
+
+static struct pci_driver usbssp_pci_driver = {
+	.name = "usbssp-pci",
+	.id_table = &usbssp_pci_ids[0],
+	.probe = usbssp_pci_probe,
+	.remove = usbssp_pci_remove,
+	.driver		= {
+		.pm	= &usbssp_pci_dev_pm_ops,
+	}
+};
+
+MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Cadence USBSSP PCI Glue Layer");
+
+module_pci_driver(usbssp_pci_driver);
+
+
-- 
2.17.1