// SPDX-License-Identifier: GPL-2.0
/*
* Cadence PCI Glue driver.
*
* Copyright (C) 2019 Cadence.
*
* Author: Pawel Laszczak <[email protected]>
*
*/
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include "core.h"
#include "gadget-export.h"
#define PCI_BAR_HOST 0
#define PCI_BAR_OTG 0
#define PCI_BAR_DEV 2
#define PCI_DEV_FN_HOST_DEVICE 0
#define PCI_DEV_FN_OTG 1
#define PCI_DRIVER_NAME "cdns-pci-usbssp"
#define PLAT_DRIVER_NAME "cdns-usbssp"
#define PCI_DEVICE_ID_CDNS_USB3 0x0100
#define PCI_DEVICE_ID_CDNS_UDC 0x0200
#define PCI_CLASS_SERIAL_USB_CDNS_USB3 (PCI_CLASS_SERIAL_USB << 8 | 0x80)
#define PCI_CLASS_SERIAL_USB_CDNS_UDC PCI_CLASS_SERIAL_USB_DEVICE
static struct pci_dev *cdnsp_get_second_fun(struct pci_dev *pdev)
{
/*
* Gets the second function.
* Platform has two function. The fist keeps resources for
* Host/Device while the secon keeps resources for DRD/OTG.
*/
if (pdev->device == PCI_DEVICE_ID_CDNS_UDC)
return pci_get_device(pdev->vendor, PCI_DEVICE_ID_CDNS_USB3, NULL);
if (pdev->device == PCI_DEVICE_ID_CDNS_USB3)
return pci_get_device(pdev->vendor, PCI_DEVICE_ID_CDNS_UDC, NULL);
return NULL;
}
static int cdnsp_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
struct device *dev = &pdev->dev;
struct pci_dev *func;
struct resource *res;
struct cdns *cdnsp;
int ret;
/*
* 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 = cdnsp_get_second_fun(pdev);
if (!func)
return -EINVAL;
if (func->class == PCI_CLASS_SERIAL_USB_XHCI ||
pdev->class == PCI_CLASS_SERIAL_USB_XHCI) {
ret = -EINVAL;
goto put_pci;
}
ret = pcim_enable_device(pdev);
if (ret) {
dev_err(&pdev->dev, "Enabling PCI device has failed %d\n", ret);
goto put_pci;
}
pci_set_master(pdev);
if (pci_is_enabled(func)) {
cdnsp = pci_get_drvdata(func);
} else {
cdnsp = kzalloc(sizeof(*cdnsp), GFP_KERNEL);
if (!cdnsp) {
ret = -ENOMEM;
goto disable_pci;
}
}
/* For GADGET device function number is 0. */
if (pdev->devfn == 0) {
resource_size_t rsrc_start, rsrc_len;
/* Function 0: host(BAR_0) + device(BAR_1).*/
dev_dbg(dev, "Initialize resources\n");
rsrc_start = pci_resource_start(pdev, PCI_BAR_DEV);
rsrc_len = pci_resource_len(pdev, PCI_BAR_DEV);
res = devm_request_mem_region(dev, rsrc_start, rsrc_len, "dev");
if (!res) {
dev_dbg(dev, "controller already in use\n");
ret = -EBUSY;
goto free_cdnsp;
}
cdnsp->dev_regs = devm_ioremap(dev, rsrc_start, rsrc_len);
if (!cdnsp->dev_regs) {
dev_dbg(dev, "error mapping memory\n");
ret = -EFAULT;
goto free_cdnsp;
}
cdnsp->dev_irq = pdev->irq;
dev_dbg(dev, "USBSS-DEV physical base addr: %pa\n",
&rsrc_start);
res = &cdnsp->xhci_res[0];
res->start = pci_resource_start(pdev, PCI_BAR_HOST);
res->end = pci_resource_end(pdev, PCI_BAR_HOST);
res->name = "xhci";
res->flags = IORESOURCE_MEM;
dev_dbg(dev, "USBSS-XHCI physical base addr: %pa\n",
&res->start);
/* Interrupt for XHCI, */
res = &cdnsp->xhci_res[1];
res->start = pdev->irq;
res->name = "host";
res->flags = IORESOURCE_IRQ;
} else {
res = &cdnsp->otg_res;
res->start = pci_resource_start(pdev, PCI_BAR_OTG);
res->end = pci_resource_end(pdev, PCI_BAR_OTG);
res->name = "otg";
res->flags = IORESOURCE_MEM;
dev_dbg(dev, "CDNSP-DRD physical base addr: %pa\n",
&res->start);
/* Interrupt for OTG/DRD. */
cdnsp->otg_irq = pdev->irq;
}
if (pci_is_enabled(func)) {
cdnsp->dev = dev;
cdnsp->gadget_init = cdnsp_gadget_init;
ret = cdns_init(cdnsp);
if (ret)
goto free_cdnsp;
}
pci_set_drvdata(pdev, cdnsp);
device_wakeup_enable(&pdev->dev);
if (pci_dev_run_wake(pdev))
pm_runtime_put_noidle(&pdev->dev);
return 0;
free_cdnsp:
if (!pci_is_enabled(func))
kfree(cdnsp);
disable_pci:
pci_disable_device(pdev);
put_pci:
pci_dev_put(func);
return ret;
}
static void cdnsp_pci_remove(struct pci_dev *pdev)
{
struct cdns *cdnsp;
struct pci_dev *func;
func = cdnsp_get_second_fun(pdev);
cdnsp = (struct cdns *)pci_get_drvdata(pdev);
if (pci_dev_run_wake(pdev))
pm_runtime_get_noresume(&pdev->dev);
if (pci_is_enabled(func)) {
cdns_remove(cdnsp);
} else {
kfree(cdnsp);
}
pci_dev_put(func);
}
static int __maybe_unused cdnsp_pci_suspend(struct device *dev)
{
struct cdns *cdns = dev_get_drvdata(dev);
return cdns_suspend(cdns);
}
static int __maybe_unused cdnsp_pci_resume(struct device *dev)
{
struct cdns *cdns = dev_get_drvdata(dev);
unsigned long flags;
int ret;
spin_lock_irqsave(&cdns->lock, flags);
ret = cdns_resume(cdns);
spin_unlock_irqrestore(&cdns->lock, flags);
cdns_set_active(cdns, 1);
return ret;
}
static const struct dev_pm_ops cdnsp_pci_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(cdnsp_pci_suspend, cdnsp_pci_resume)
};
static const struct pci_device_id cdnsp_pci_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_CDNS, PCI_DEVICE_ID_CDNS_UDC),
.class = PCI_CLASS_SERIAL_USB_CDNS_UDC },
{ PCI_DEVICE(PCI_VENDOR_ID_CDNS, PCI_DEVICE_ID_CDNS_UDC),
.class = PCI_CLASS_SERIAL_USB_CDNS_USB3 },
{ PCI_DEVICE(PCI_VENDOR_ID_CDNS, PCI_DEVICE_ID_CDNS_USB3),
.class = PCI_CLASS_SERIAL_USB_CDNS_USB3 },
{ 0, }
};
static struct pci_driver cdnsp_pci_driver = {
.name = "cdnsp-pci",
.id_table = cdnsp_pci_ids,
.probe = cdnsp_pci_probe,
.remove = cdnsp_pci_remove,
.driver = {
.pm = &cdnsp_pci_pm_ops,
}
};
module_pci_driver(cdnsp_pci_driver);
MODULE_DEVICE_TABLE(pci, cdnsp_pci_ids);
MODULE_ALIAS("pci:cdnsp");
MODULE_AUTHOR("Pawel Laszczak <[email protected]>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Cadence CDNSP PCI driver");
Codebase Browser
linux