1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Cadence USBSS PCI Glue driver
  4 *
  5 * Copyright (C) 2018-2019 Cadence.
  6 *
  7 * Author: Pawel Laszczak <pawell@cadence.com>
  8 */
  9
 10#include <linux/kernel.h>
 11#include <linux/module.h>
 12#include <linux/pci.h>
 13#include <linux/platform_device.h>
 14#include <linux/dma-mapping.h>
 15#include <linux/slab.h>
 16
 17struct cdns3_wrap {
 18	struct platform_device *plat_dev;
 19	struct resource dev_res[6];
 20	int devfn;
 21};
 22
 23#define RES_IRQ_HOST_ID		0
 24#define RES_IRQ_PERIPHERAL_ID	1
 25#define RES_IRQ_OTG_ID		2
 26#define RES_HOST_ID		3
 27#define RES_DEV_ID		4
 28#define RES_DRD_ID		5
 29
 30#define PCI_BAR_HOST		0
 31#define PCI_BAR_DEV		2
 32#define PCI_BAR_OTG		0
 33
 34#define PCI_DEV_FN_HOST_DEVICE	0
 35#define PCI_DEV_FN_OTG		1
 36
 37#define PCI_DRIVER_NAME		"cdns3-pci-usbss"
 38#define PLAT_DRIVER_NAME	"cdns-usb3"
 39
 40static struct pci_dev *cdns3_get_second_fun(struct pci_dev *pdev)
 41{
 42	struct pci_dev *func;
 43
 44	/*
 45	 * Gets the second function.
 46	 * It's little tricky, but this platform has two function.
 47	 * The fist keeps resources for Host/Device while the second
 48	 * keeps resources for DRD/OTG.
 49	 */
 50	func = pci_get_device(pdev->vendor, pdev->device, NULL);
 51	if (unlikely(!func))
 52		return NULL;
 53
 54	if (func->devfn == pdev->devfn) {
 55		func = pci_get_device(pdev->vendor, pdev->device, func);
 56		if (unlikely(!func))
 57			return NULL;
 58	}
 59
 60	if (func->devfn != PCI_DEV_FN_HOST_DEVICE &&
 61	    func->devfn != PCI_DEV_FN_OTG) {
 62		return NULL;
 63	}
 64
 65	return func;
 66}
 67
 68static int cdns3_pci_probe(struct pci_dev *pdev,
 69			   const struct pci_device_id *id)
 70{
 71	struct platform_device_info plat_info;
 72	struct cdns3_wrap *wrap;
 73	struct resource *res;
 74	struct pci_dev *func;
 75	int err;
 76
 77	/*
 78	 * for GADGET/HOST PCI (devfn) function number is 0,
 79	 * for OTG PCI (devfn) function number is 1
 80	 */
 81	if (!id || (pdev->devfn != PCI_DEV_FN_HOST_DEVICE &&
 82		    pdev->devfn != PCI_DEV_FN_OTG))
 83		return -EINVAL;
 84
 85	func = cdns3_get_second_fun(pdev);
 86	if (unlikely(!func))
 87		return -EINVAL;
 88
 89	err = pcim_enable_device(pdev);
 90	if (err) {
 91		dev_err(&pdev->dev, "Enabling PCI device has failed %d\n", err);
 92		return err;
 93	}
 94
 95	pci_set_master(pdev);
 96
 97	if (pci_is_enabled(func)) {
 98		wrap = pci_get_drvdata(func);
 99	} else {
100		wrap = kzalloc(sizeof(*wrap), GFP_KERNEL);
101		if (!wrap) {
102			pci_disable_device(pdev);
103			return -ENOMEM;
104		}
105	}
106
107	res = wrap->dev_res;
108
109	if (pdev->devfn == PCI_DEV_FN_HOST_DEVICE) {
110		/* function 0: host(BAR_0) + device(BAR_1).*/
111		dev_dbg(&pdev->dev, "Initialize Device resources\n");
112		res[RES_DEV_ID].start = pci_resource_start(pdev, PCI_BAR_DEV);
113		res[RES_DEV_ID].end =   pci_resource_end(pdev, PCI_BAR_DEV);
114		res[RES_DEV_ID].name = "dev";
115		res[RES_DEV_ID].flags = IORESOURCE_MEM;
116		dev_dbg(&pdev->dev, "USBSS-DEV physical base addr: %pa\n",
117			&res[RES_DEV_ID].start);
118
119		res[RES_HOST_ID].start = pci_resource_start(pdev, PCI_BAR_HOST);
120		res[RES_HOST_ID].end = pci_resource_end(pdev, PCI_BAR_HOST);
121		res[RES_HOST_ID].name = "xhci";
122		res[RES_HOST_ID].flags = IORESOURCE_MEM;
123		dev_dbg(&pdev->dev, "USBSS-XHCI physical base addr: %pa\n",
124			&res[RES_HOST_ID].start);
125
126		/* Interrupt for XHCI */
127		wrap->dev_res[RES_IRQ_HOST_ID].start = pdev->irq;
128		wrap->dev_res[RES_IRQ_HOST_ID].name = "host";
129		wrap->dev_res[RES_IRQ_HOST_ID].flags = IORESOURCE_IRQ;
130
131		/* Interrupt device. It's the same as for HOST. */
132		wrap->dev_res[RES_IRQ_PERIPHERAL_ID].start = pdev->irq;
133		wrap->dev_res[RES_IRQ_PERIPHERAL_ID].name = "peripheral";
134		wrap->dev_res[RES_IRQ_PERIPHERAL_ID].flags = IORESOURCE_IRQ;
135	} else {
136		res[RES_DRD_ID].start = pci_resource_start(pdev, PCI_BAR_OTG);
137		res[RES_DRD_ID].end =   pci_resource_end(pdev, PCI_BAR_OTG);
138		res[RES_DRD_ID].name = "otg";
139		res[RES_DRD_ID].flags = IORESOURCE_MEM;
140		dev_dbg(&pdev->dev, "USBSS-DRD physical base addr: %pa\n",
141			&res[RES_DRD_ID].start);
142
143		/* Interrupt for OTG/DRD. */
144		wrap->dev_res[RES_IRQ_OTG_ID].start = pdev->irq;
145		wrap->dev_res[RES_IRQ_OTG_ID].name = "otg";
146		wrap->dev_res[RES_IRQ_OTG_ID].flags = IORESOURCE_IRQ;
147	}
148
149	if (pci_is_enabled(func)) {
150		/* set up platform device info */
151		memset(&plat_info, 0, sizeof(plat_info));
152		plat_info.parent = &pdev->dev;
153		plat_info.fwnode = pdev->dev.fwnode;
154		plat_info.name = PLAT_DRIVER_NAME;
155		plat_info.id = pdev->devfn;
156		wrap->devfn  = pdev->devfn;
157		plat_info.res = wrap->dev_res;
158		plat_info.num_res = ARRAY_SIZE(wrap->dev_res);
159		plat_info.dma_mask = pdev->dma_mask;
160		/* register platform device */
161		wrap->plat_dev = platform_device_register_full(&plat_info);
162		if (IS_ERR(wrap->plat_dev)) {
163			pci_disable_device(pdev);
164			err = PTR_ERR(wrap->plat_dev);
165			kfree(wrap);
166			return err;
167		}
168	}
169
170	pci_set_drvdata(pdev, wrap);
171	return err;
172}
173
174static void cdns3_pci_remove(struct pci_dev *pdev)
175{
176	struct cdns3_wrap *wrap;
177	struct pci_dev *func;
178
179	func = cdns3_get_second_fun(pdev);
180
181	wrap = (struct cdns3_wrap *)pci_get_drvdata(pdev);
182	if (wrap->devfn == pdev->devfn)
183		platform_device_unregister(wrap->plat_dev);
184
185	if (!pci_is_enabled(func))
186		kfree(wrap);
187}
188
189static const struct pci_device_id cdns3_pci_ids[] = {
190	{ PCI_VDEVICE(CDNS, PCI_DEVICE_ID_CDNS_USBSS) },
191	{ 0, }
192};
193
194static struct pci_driver cdns3_pci_driver = {
195	.name = PCI_DRIVER_NAME,
196	.id_table = cdns3_pci_ids,
197	.probe = cdns3_pci_probe,
198	.remove = cdns3_pci_remove,
199};
200
201module_pci_driver(cdns3_pci_driver);
202MODULE_DEVICE_TABLE(pci, cdns3_pci_ids);
203
204MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
205MODULE_LICENSE("GPL v2");
206MODULE_DESCRIPTION("Cadence USBSS PCI wrapper");