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