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// 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;
}
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");
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