Loading...
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
40#define CDNS_VENDOR_ID 0x17cd
41#define CDNS_DEVICE_ID 0x0100
42
43static 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
71static 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
177static 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
192static const struct pci_device_id cdns3_pci_ids[] = {
193 { PCI_DEVICE(CDNS_VENDOR_ID, CDNS_DEVICE_ID), },
194 { 0, }
195};
196
197static 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
204module_pci_driver(cdns3_pci_driver);
205MODULE_DEVICE_TABLE(pci, cdns3_pci_ids);
206
207MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
208MODULE_LICENSE("GPL v2");
209MODULE_DESCRIPTION("Cadence USBSS PCI wrapper");
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");