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
17 struct 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
40 #define CDNS_VENDOR_ID 0x17cd
41 #define CDNS_DEVICE_ID 0x0100
42
cdns3_get_second_fun(struct pci_dev * pdev)43 static struct pci_dev *cdns3_get_second_fun(struct pci_dev *pdev)
44 {
45 struct pci_dev *func;
46
47 /*
48 * Gets the second function.
49 * It's little tricky, but this platform has two function.
50 * The fist keeps resources for Host/Device while the second
51 * keeps resources for DRD/OTG.
52 */
53 func = pci_get_device(pdev->vendor, pdev->device, NULL);
54 if (unlikely(!func))
55 return NULL;
56
57 if (func->devfn == pdev->devfn) {
58 func = pci_get_device(pdev->vendor, pdev->device, func);
59 if (unlikely(!func))
60 return NULL;
61 }
62
63 if (func->devfn != PCI_DEV_FN_HOST_DEVICE &&
64 func->devfn != PCI_DEV_FN_OTG) {
65 return NULL;
66 }
67
68 return func;
69 }
70
cdns3_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)71 static int cdns3_pci_probe(struct pci_dev *pdev,
72 const struct pci_device_id *id)
73 {
74 struct platform_device_info plat_info;
75 struct cdns3_wrap *wrap;
76 struct resource *res;
77 struct pci_dev *func;
78 int err;
79
80 /*
81 * for GADGET/HOST PCI (devfn) function number is 0,
82 * for OTG PCI (devfn) function number is 1
83 */
84 if (!id || (pdev->devfn != PCI_DEV_FN_HOST_DEVICE &&
85 pdev->devfn != PCI_DEV_FN_OTG))
86 return -EINVAL;
87
88 func = cdns3_get_second_fun(pdev);
89 if (unlikely(!func))
90 return -EINVAL;
91
92 err = pcim_enable_device(pdev);
93 if (err) {
94 dev_err(&pdev->dev, "Enabling PCI device has failed %d\n", err);
95 return err;
96 }
97
98 pci_set_master(pdev);
99
100 if (pci_is_enabled(func)) {
101 wrap = pci_get_drvdata(func);
102 } else {
103 wrap = kzalloc(sizeof(*wrap), GFP_KERNEL);
104 if (!wrap) {
105 pci_disable_device(pdev);
106 return -ENOMEM;
107 }
108 }
109
110 res = wrap->dev_res;
111
112 if (pdev->devfn == PCI_DEV_FN_HOST_DEVICE) {
113 /* function 0: host(BAR_0) + device(BAR_1).*/
114 dev_dbg(&pdev->dev, "Initialize Device resources\n");
115 res[RES_DEV_ID].start = pci_resource_start(pdev, PCI_BAR_DEV);
116 res[RES_DEV_ID].end = pci_resource_end(pdev, PCI_BAR_DEV);
117 res[RES_DEV_ID].name = "dev";
118 res[RES_DEV_ID].flags = IORESOURCE_MEM;
119 dev_dbg(&pdev->dev, "USBSS-DEV physical base addr: %pa\n",
120 &res[RES_DEV_ID].start);
121
122 res[RES_HOST_ID].start = pci_resource_start(pdev, PCI_BAR_HOST);
123 res[RES_HOST_ID].end = pci_resource_end(pdev, PCI_BAR_HOST);
124 res[RES_HOST_ID].name = "xhci";
125 res[RES_HOST_ID].flags = IORESOURCE_MEM;
126 dev_dbg(&pdev->dev, "USBSS-XHCI physical base addr: %pa\n",
127 &res[RES_HOST_ID].start);
128
129 /* Interrupt for XHCI */
130 wrap->dev_res[RES_IRQ_HOST_ID].start = pdev->irq;
131 wrap->dev_res[RES_IRQ_HOST_ID].name = "host";
132 wrap->dev_res[RES_IRQ_HOST_ID].flags = IORESOURCE_IRQ;
133
134 /* Interrupt device. It's the same as for HOST. */
135 wrap->dev_res[RES_IRQ_PERIPHERAL_ID].start = pdev->irq;
136 wrap->dev_res[RES_IRQ_PERIPHERAL_ID].name = "peripheral";
137 wrap->dev_res[RES_IRQ_PERIPHERAL_ID].flags = IORESOURCE_IRQ;
138 } else {
139 res[RES_DRD_ID].start = pci_resource_start(pdev, PCI_BAR_OTG);
140 res[RES_DRD_ID].end = pci_resource_end(pdev, PCI_BAR_OTG);
141 res[RES_DRD_ID].name = "otg";
142 res[RES_DRD_ID].flags = IORESOURCE_MEM;
143 dev_dbg(&pdev->dev, "USBSS-DRD physical base addr: %pa\n",
144 &res[RES_DRD_ID].start);
145
146 /* Interrupt for OTG/DRD. */
147 wrap->dev_res[RES_IRQ_OTG_ID].start = pdev->irq;
148 wrap->dev_res[RES_IRQ_OTG_ID].name = "otg";
149 wrap->dev_res[RES_IRQ_OTG_ID].flags = IORESOURCE_IRQ;
150 }
151
152 if (pci_is_enabled(func)) {
153 /* set up platform device info */
154 memset(&plat_info, 0, sizeof(plat_info));
155 plat_info.parent = &pdev->dev;
156 plat_info.fwnode = pdev->dev.fwnode;
157 plat_info.name = PLAT_DRIVER_NAME;
158 plat_info.id = pdev->devfn;
159 wrap->devfn = pdev->devfn;
160 plat_info.res = wrap->dev_res;
161 plat_info.num_res = ARRAY_SIZE(wrap->dev_res);
162 plat_info.dma_mask = pdev->dma_mask;
163 /* register platform device */
164 wrap->plat_dev = platform_device_register_full(&plat_info);
165 if (IS_ERR(wrap->plat_dev)) {
166 pci_disable_device(pdev);
167 err = PTR_ERR(wrap->plat_dev);
168 kfree(wrap);
169 return err;
170 }
171 }
172
173 pci_set_drvdata(pdev, wrap);
174 return err;
175 }
176
cdns3_pci_remove(struct pci_dev * pdev)177 static void cdns3_pci_remove(struct pci_dev *pdev)
178 {
179 struct cdns3_wrap *wrap;
180 struct pci_dev *func;
181
182 func = cdns3_get_second_fun(pdev);
183
184 wrap = (struct cdns3_wrap *)pci_get_drvdata(pdev);
185 if (wrap->devfn == pdev->devfn)
186 platform_device_unregister(wrap->plat_dev);
187
188 if (!pci_is_enabled(func))
189 kfree(wrap);
190 }
191
192 static const struct pci_device_id cdns3_pci_ids[] = {
193 { PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
194 { 0, }
195 };
196
197 static struct pci_driver cdns3_pci_driver = {
198 .name = PCI_DRIVER_NAME,
199 .id_table = cdns3_pci_ids,
200 .probe = cdns3_pci_probe,
201 .remove = cdns3_pci_remove,
202 };
203
204 module_pci_driver(cdns3_pci_driver);
205 MODULE_DEVICE_TABLE(pci, cdns3_pci_ids);
206
207 MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
208 MODULE_LICENSE("GPL v2");
209 MODULE_DESCRIPTION("Cadence USBSS PCI wrapper");
210