diff options
Diffstat (limited to 'drivers/usb/cdns3/cdns3-pci-wrap.c')
| -rw-r--r-- | drivers/usb/cdns3/cdns3-pci-wrap.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/drivers/usb/cdns3/cdns3-pci-wrap.c b/drivers/usb/cdns3/cdns3-pci-wrap.c new file mode 100644 index 000000000..1f6320d98 --- /dev/null +++ b/drivers/usb/cdns3/cdns3-pci-wrap.c @@ -0,0 +1,209 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Cadence USBSS PCI Glue driver + * + * Copyright (C) 2018-2019 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 resource dev_res[6]; + int devfn; +}; + +#define RES_IRQ_HOST_ID 0 +#define RES_IRQ_PERIPHERAL_ID 1 +#define RES_IRQ_OTG_ID 2 +#define RES_HOST_ID 3 +#define RES_DEV_ID 4 +#define RES_DRD_ID 5 + +#define PCI_BAR_HOST 0 +#define PCI_BAR_DEV 2 +#define PCI_BAR_OTG 0 + +#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 + +static struct pci_dev *cdns3_get_second_fun(struct pci_dev *pdev) +{ + struct pci_dev *func; + + /* + * Gets the second function. + * It's little tricky, but this platform has two function. + * The fist keeps resources for Host/Device while the second + * keeps resources for DRD/OTG. + */ + func = pci_get_device(pdev->vendor, pdev->device, NULL); + if (unlikely(!func)) + return NULL; + + if (func->devfn == pdev->devfn) { + func = pci_get_device(pdev->vendor, pdev->device, func); + if (unlikely(!func)) + return NULL; + } + + if (func->devfn != PCI_DEV_FN_HOST_DEVICE && + func->devfn != PCI_DEV_FN_OTG) { + return NULL; + } + + return func; +} + +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; + struct pci_dev *func; + 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 && + pdev->devfn != PCI_DEV_FN_OTG)) + return -EINVAL; + + func = cdns3_get_second_fun(pdev); + if (unlikely(!func)) + 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); + + if (pci_is_enabled(func)) { + wrap = pci_get_drvdata(func); + } else { + wrap = kzalloc(sizeof(*wrap), GFP_KERNEL); + if (!wrap) { + pci_disable_device(pdev); + return -ENOMEM; + } + } + + res = wrap->dev_res; + + if (pdev->devfn == PCI_DEV_FN_HOST_DEVICE) { + /* function 0: host(BAR_0) + device(BAR_1).*/ + dev_dbg(&pdev->dev, "Initialize Device resources\n"); + 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 = "dev"; + res[RES_DEV_ID].flags = IORESOURCE_MEM; + dev_dbg(&pdev->dev, "USBSS-DEV physical base addr: %pa\n", + &res[RES_DEV_ID].start); + + 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 = "xhci"; + res[RES_HOST_ID].flags = IORESOURCE_MEM; + dev_dbg(&pdev->dev, "USBSS-XHCI physical base addr: %pa\n", + &res[RES_HOST_ID].start); + + /* Interrupt for XHCI */ + wrap->dev_res[RES_IRQ_HOST_ID].start = pdev->irq; + wrap->dev_res[RES_IRQ_HOST_ID].name = "host"; + wrap->dev_res[RES_IRQ_HOST_ID].flags = IORESOURCE_IRQ; + + /* Interrupt device. It's the same as for HOST. */ + wrap->dev_res[RES_IRQ_PERIPHERAL_ID].start = pdev->irq; + wrap->dev_res[RES_IRQ_PERIPHERAL_ID].name = "peripheral"; + wrap->dev_res[RES_IRQ_PERIPHERAL_ID].flags = IORESOURCE_IRQ; + } else { + 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 = "otg"; + res[RES_DRD_ID].flags = IORESOURCE_MEM; + dev_dbg(&pdev->dev, "USBSS-DRD physical base addr: %pa\n", + &res[RES_DRD_ID].start); + + /* Interrupt for OTG/DRD. */ + wrap->dev_res[RES_IRQ_OTG_ID].start = pdev->irq; + wrap->dev_res[RES_IRQ_OTG_ID].name = "otg"; + wrap->dev_res[RES_IRQ_OTG_ID].flags = IORESOURCE_IRQ; + } + + if (pci_is_enabled(func)) { + /* 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; + wrap->devfn = 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)) { + pci_disable_device(pdev); + err = PTR_ERR(wrap->plat_dev); + kfree(wrap); + return err; + } + } + + pci_set_drvdata(pdev, wrap); + return err; +} + +static void cdns3_pci_remove(struct pci_dev *pdev) +{ + struct cdns3_wrap *wrap; + struct pci_dev *func; + + func = cdns3_get_second_fun(pdev); + + wrap = (struct cdns3_wrap *)pci_get_drvdata(pdev); + if (wrap->devfn == pdev->devfn) + platform_device_unregister(wrap->plat_dev); + + if (!pci_is_enabled(func)) + kfree(wrap); +} + +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 wrapper"); |