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Subject[RFC PATCH v1 01/14] usb:cdns3: add pci to platform driver wrapper.
Date
Patch adds PCI specific glue drivier that creaties and registers in
system cdns-usb3 platform device. Thanks to that we will be able to use
the cdns-usb3 platform driver for USBSS-DEV controller
build on PCI board

Signed-off-by: Pawel Laszczak <pawell@cadence.com>
---
drivers/usb/Kconfig | 2 +
drivers/usb/Makefile | 2 +
drivers/usb/cdns3/Kconfig | 24 +++++
drivers/usb/cdns3/Makefile | 3 +
drivers/usb/cdns3/cdns3-pci-wrap.c | 162 +++++++++++++++++++++++++++++
5 files changed, 193 insertions(+)
create mode 100644 drivers/usb/cdns3/Kconfig
create mode 100644 drivers/usb/cdns3/Makefile
create mode 100644 drivers/usb/cdns3/cdns3-pci-wrap.c

diff --git a/drivers/usb/Kconfig b/drivers/usb/Kconfig
index 987fc5ba6321..5f9334019d04 100644
--- a/drivers/usb/Kconfig
+++ b/drivers/usb/Kconfig
@@ -112,6 +112,8 @@ source "drivers/usb/usbip/Kconfig"

endif

+source "drivers/usb/cdns3/Kconfig"
+
source "drivers/usb/mtu3/Kconfig"

source "drivers/usb/musb/Kconfig"
diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index 7d1b8c82b208..82093a60ea2c 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -8,6 +8,8 @@
obj-$(CONFIG_USB) += core/
obj-$(CONFIG_USB_SUPPORT) += phy/

+obj-$(CONFIG_USB_CDNS3) += cdns3/
+
obj-$(CONFIG_USB_DWC3) += dwc3/
obj-$(CONFIG_USB_DWC2) += dwc2/
obj-$(CONFIG_USB_ISP1760) += isp1760/
diff --git a/drivers/usb/cdns3/Kconfig b/drivers/usb/cdns3/Kconfig
new file mode 100644
index 000000000000..888458372adb
--- /dev/null
+++ b/drivers/usb/cdns3/Kconfig
@@ -0,0 +1,24 @@
+config USB_CDNS3
+ tristate "Cadence USB3 Dual-Role Controller"
+ depends on ((USB_XHCI_HCD && USB_GADGET) || (USB_XHCI_HCD && !USB_GADGET) || (!USB_XHCI_HCD && USB_GADGET)) && HAS_DMA
+ help
+ Say Y here if your system has a cadence USB3 dual-role controller.
+ It supports: dual-role switch Host-only, and Peripheral-only.
+
+ If you choose to build this driver is a dynamically linked
+ module, the module will be called cdns3.ko.
+
+if USB_CDNS3
+
+config USB_CDNS3_PCI_WRAP
+ tristate "PCIe-based Platforms"
+ depends on USB_PCI && ACPI
+ default USB_CDNS3
+ help
+ If you're using the USBSS Core IP with a PCIe, please say
+ 'Y' or 'M' here.
+
+ If you choose to build this driver as module it will
+ be dynamically linked and module will be called cdns3-pci.ko
+
+endif
diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile
new file mode 100644
index 000000000000..dcdd62003c6a
--- /dev/null
+++ b/drivers/usb/cdns3/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_USB_CDNS3_PCI_WRAP) += cdns3-pci.o
+
+cdns3-pci-y := cdns3-pci-wrap.o
diff --git a/drivers/usb/cdns3/cdns3-pci-wrap.c b/drivers/usb/cdns3/cdns3-pci-wrap.c
new file mode 100644
index 000000000000..6c229ab6dffb
--- /dev/null
+++ b/drivers/usb/cdns3/cdns3-pci-wrap.c
@@ -0,0 +1,162 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Cadence USBSS PCI Glue driver
+ *
+ * Copyright (C) 2018 Cadence.
+ *
+ * Author: Pawel Laszczak <pawell@cadence.com>
+ */
+
+#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 cdns3_wrap {
+ struct platform_device *plat_dev;
+ struct pci_dev *hg_dev;
+ struct resource dev_res[4];
+};
+
+struct cdns3_wrap wrap;
+
+#define RES_IRQ_ID 0
+#define RES_HOST_ID 1
+#define RES_DEV_ID 2
+#define RES_DRD_ID 3
+
+#define PCI_BAR_HOST 0
+#define PCI_BAR_DEV 2
+#define PCI_BAR_OTG 4
+
+#define PCI_DEV_FN_HOST_DEVICE 0
+#define PCI_DEV_FN_OTG 1
+
+#define PCI_DRIVER_NAME "cdns3-pci-usbss"
+#define PLAT_DRIVER_NAME "cdns-usb3"
+
+#define CDNS_VENDOR_ID 0x17cd
+#define CDNS_DEVICE_ID 0x0100
+
+/**
+ * cdns3_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 cdns3_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *id)
+{
+ struct platform_device_info plat_info;
+ struct cdns3_wrap *wrap;
+ struct resource *res;
+ int err;
+
+ /*
+ * for GADGET/HOST PCI (devfn) function number is 0,
+ * for OTG PCI (devfn) function number is 1
+ */
+ if (!id || pdev->devfn != PCI_DEV_FN_HOST_DEVICE)
+ return -EINVAL;
+
+ err = pcim_enable_device(pdev);
+ if (err) {
+ dev_err(&pdev->dev, "Enabling PCI device has failed %d\n", err);
+ return err;
+ }
+
+ pci_set_master(pdev);
+ wrap = devm_kzalloc(&pdev->dev, sizeof(*wrap), GFP_KERNEL);
+ if (!wrap) {
+ dev_err(&pdev->dev, "Failed to load PCI module\n");
+ return -ENOMEM;
+ }
+
+ /* function 0: host(BAR_0) + device(BAR_1) + otg(BAR_2)). */
+ memset(wrap->dev_res, 0x00,
+ sizeof(struct resource) * ARRAY_SIZE(wrap->dev_res));
+ dev_info(&pdev->dev, "Initialize Device resources\n");
+ res = wrap->dev_res;
+
+#if IS_ENABLED(CONFIG_USB_CDNS3_GADGET)
+ res[RES_DEV_ID].start = pci_resource_start(pdev, PCI_BAR_DEV);
+ res[RES_DEV_ID].end = pci_resource_end(pdev, PCI_BAR_DEV);
+ res[RES_DEV_ID].name = "cdns3-dev-regs";
+ res[RES_DEV_ID].flags = IORESOURCE_MEM;
+ dev_info(&pdev->dev, "USBSS-DEV physical base addr: %pa\n",
+ &res[RES_DEV_ID].start);
+
+#endif
+
+#if IS_ENABLED(CONFIG_USB_CDNS3_HOST)
+ res[RES_HOST_ID].start = pci_resource_start(pdev, PCI_BAR_HOST);
+ res[RES_HOST_ID].end = pci_resource_end(pdev, PCI_BAR_HOST);
+ res[RES_HOST_ID].name = "cdns3-xhci-regs";
+ res[RES_HOST_ID].flags = IORESOURCE_MEM;
+ dev_info(&pdev->dev, "USBSS-XHCI physical base addr: %pa\n",
+ &res[RES_HOST_ID].start);
+#endif
+
+ res[RES_DRD_ID].start = pci_resource_start(pdev, PCI_BAR_OTG);
+ res[RES_DRD_ID].end = pci_resource_end(pdev, PCI_BAR_OTG);
+ res[RES_DRD_ID].name = "cdns3-otg";
+ res[RES_DRD_ID].flags = IORESOURCE_MEM;
+ dev_info(&pdev->dev, "USBSS-DRD physical base addr: %pa\n",
+ &res[RES_DRD_ID].start);
+
+ /* Interrupt common for both device and XHCI */
+ wrap->dev_res[RES_IRQ_ID].start = pdev->irq;
+ wrap->dev_res[RES_IRQ_ID].name = "cdns3-irq";
+ wrap->dev_res[RES_IRQ_ID].flags = IORESOURCE_IRQ;
+
+ /* set up platform device info */
+ memset(&plat_info, 0, sizeof(plat_info));
+ plat_info.parent = &pdev->dev;
+ plat_info.fwnode = pdev->dev.fwnode;
+ plat_info.name = PLAT_DRIVER_NAME;
+ plat_info.id = pdev->devfn;
+ plat_info.res = wrap->dev_res;
+ plat_info.num_res = ARRAY_SIZE(wrap->dev_res);
+ plat_info.dma_mask = pdev->dma_mask;
+
+ /* register platform device */
+ wrap->plat_dev = platform_device_register_full(&plat_info);
+ if (IS_ERR(wrap->plat_dev)) {
+ err = PTR_ERR(wrap->plat_dev);
+ return err;
+ }
+
+ pci_set_drvdata(pdev, wrap);
+
+ return err;
+}
+
+void cdns3_pci_remove(struct pci_dev *pdev)
+{
+ struct cdns3_wrap *wrap = (struct cdns3_wrap *)pci_get_drvdata(pdev);
+
+ platform_device_unregister(wrap->plat_dev);
+}
+
+static const struct pci_device_id cdns3_pci_ids[] = {
+ { PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
+ { 0, }
+};
+
+static struct pci_driver cdns3_pci_driver = {
+ .name = PCI_DRIVER_NAME,
+ .id_table = cdns3_pci_ids,
+ .probe = cdns3_pci_probe,
+ .remove = cdns3_pci_remove,
+};
+
+module_pci_driver(cdns3_pci_driver);
+MODULE_DEVICE_TABLE(pci, cdns3_pci_ids);
+
+MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Cadence USBSS PCI wrapperr");
+
--
2.17.1
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