1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Cadence USBHS-DEV controller - PCI Glue driver.
  4 *
  5 * Copyright (C) 2023 Cadence.
  6 *
  7 * Author: Pawel Laszczak <pawell@cadence.com>
  8 *
  9 */
 10
 11#include <linux/pm_runtime.h>
 12#include <linux/slab.h>
 13#include <linux/pci.h>
 14
 15#include "cdns2-gadget.h"
 16
 17#define PCI_DRIVER_NAME		"cdns-pci-usbhs"
 18#define CDNS_VENDOR_ID		0x17cd
 19#define CDNS_DEVICE_ID		0x0120
 20#define PCI_BAR_DEV		0
 21#define PCI_DEV_FN_DEVICE	0
 22
 23static int cdns2_pci_probe(struct pci_dev *pdev,
 24			   const struct pci_device_id *id)
 25{
 26	resource_size_t rsrc_start, rsrc_len;
 27	struct device *dev = &pdev->dev;
 28	struct cdns2_device *priv_dev;
 29	struct resource *res;
 30	int ret;
 31
 32	/* For GADGET PCI (devfn) function number is 0. */
 33	if (!id || pdev->devfn != PCI_DEV_FN_DEVICE ||
 34	    pdev->class != PCI_CLASS_SERIAL_USB_DEVICE)
 35		return -EINVAL;
 36
 37	ret = pcim_enable_device(pdev);
 38	if (ret) {
 39		dev_err(&pdev->dev, "Enabling PCI device has failed %d\n", ret);
 40		return ret;
 41	}
 42
 43	pci_set_master(pdev);
 44
 45	priv_dev = devm_kzalloc(&pdev->dev, sizeof(*priv_dev), GFP_KERNEL);
 46	if (!priv_dev)
 47		return -ENOMEM;
 48
 49	dev_dbg(dev, "Initialize resources\n");
 50	rsrc_start = pci_resource_start(pdev, PCI_BAR_DEV);
 51	rsrc_len = pci_resource_len(pdev, PCI_BAR_DEV);
 52
 53	res = devm_request_mem_region(dev, rsrc_start, rsrc_len, "dev");
 54	if (!res) {
 55		dev_dbg(dev, "controller already in use\n");
 56		return -EBUSY;
 57	}
 58
 59	priv_dev->regs = devm_ioremap(dev, rsrc_start, rsrc_len);
 60	if (!priv_dev->regs) {
 61		dev_dbg(dev, "error mapping memory\n");
 62		return -EFAULT;
 63	}
 64
 65	priv_dev->irq = pdev->irq;
 66	dev_dbg(dev, "USBSS-DEV physical base addr: %pa\n",
 67		&rsrc_start);
 68
 69	priv_dev->dev = dev;
 70
 71	priv_dev->eps_supported = 0x000f000f;
 72	priv_dev->onchip_tx_buf = 16;
 73	priv_dev->onchip_rx_buf = 16;
 74
 75	ret = cdns2_gadget_init(priv_dev);
 76	if (ret)
 77		return ret;
 78
 79	pci_set_drvdata(pdev, priv_dev);
 80
 81	device_wakeup_enable(&pdev->dev);
 82	if (pci_dev_run_wake(pdev))
 83		pm_runtime_put_noidle(&pdev->dev);
 84
 85	return 0;
 86}
 87
 88static void cdns2_pci_remove(struct pci_dev *pdev)
 89{
 90	struct cdns2_device *priv_dev = pci_get_drvdata(pdev);
 91
 92	if (pci_dev_run_wake(pdev))
 93		pm_runtime_get_noresume(&pdev->dev);
 94
 95	cdns2_gadget_remove(priv_dev);
 96}
 97
 98static int cdns2_pci_suspend(struct device *dev)
 99{
100	struct cdns2_device *priv_dev = dev_get_drvdata(dev);
101
102	return cdns2_gadget_suspend(priv_dev);
103}
104
105static int cdns2_pci_resume(struct device *dev)
106{
107	struct cdns2_device *priv_dev = dev_get_drvdata(dev);
108
109	return cdns2_gadget_resume(priv_dev, 1);
110}
111
112static const struct dev_pm_ops cdns2_pci_pm_ops = {
113	SYSTEM_SLEEP_PM_OPS(cdns2_pci_suspend, cdns2_pci_resume)
114};
115
116static const struct pci_device_id cdns2_pci_ids[] = {
117	{ PCI_VENDOR_ID_CDNS, CDNS_DEVICE_ID, PCI_ANY_ID, PCI_ANY_ID,
118	  PCI_CLASS_SERIAL_USB_DEVICE, PCI_ANY_ID },
119	{ 0, }
120};
121
122static struct pci_driver cdns2_pci_driver = {
123	.name = "cdns2-pci",
124	.id_table = &cdns2_pci_ids[0],
125	.probe = cdns2_pci_probe,
126	.remove = cdns2_pci_remove,
127	.driver = {
128		.pm = pm_ptr(&cdns2_pci_pm_ops),
129	}
130};
131
132module_pci_driver(cdns2_pci_driver);
133MODULE_DEVICE_TABLE(pci, cdns2_pci_ids);
134
135MODULE_ALIAS("pci:cdns2");
136MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
137MODULE_LICENSE("GPL");
138MODULE_DESCRIPTION("Cadence CDNS2 PCI driver");