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 PCI_DEVICE_ID_CDNS_USB2 0x0120
19 #define PCI_BAR_DEV 0
20 #define PCI_DEV_FN_DEVICE 0
21
cdns2_pci_probe(struct pci_dev * pdev,const struct pci_device_id * id)22 static int cdns2_pci_probe(struct pci_dev *pdev,
23 const struct pci_device_id *id)
24 {
25 resource_size_t rsrc_start, rsrc_len;
26 struct device *dev = &pdev->dev;
27 struct cdns2_device *priv_dev;
28 struct resource *res;
29 int ret;
30
31 /* For GADGET PCI (devfn) function number is 0. */
32 if (!id || pdev->devfn != PCI_DEV_FN_DEVICE ||
33 pdev->class != PCI_CLASS_SERIAL_USB_DEVICE)
34 return -EINVAL;
35
36 ret = pcim_enable_device(pdev);
37 if (ret) {
38 dev_err(&pdev->dev, "Enabling PCI device has failed %d\n", ret);
39 return ret;
40 }
41
42 pci_set_master(pdev);
43
44 priv_dev = devm_kzalloc(&pdev->dev, sizeof(*priv_dev), GFP_KERNEL);
45 if (!priv_dev)
46 return -ENOMEM;
47
48 dev_dbg(dev, "Initialize resources\n");
49 rsrc_start = pci_resource_start(pdev, PCI_BAR_DEV);
50 rsrc_len = pci_resource_len(pdev, PCI_BAR_DEV);
51
52 res = devm_request_mem_region(dev, rsrc_start, rsrc_len, "dev");
53 if (!res) {
54 dev_dbg(dev, "controller already in use\n");
55 return -EBUSY;
56 }
57
58 priv_dev->regs = devm_ioremap(dev, rsrc_start, rsrc_len);
59 if (!priv_dev->regs) {
60 dev_dbg(dev, "error mapping memory\n");
61 return -EFAULT;
62 }
63
64 priv_dev->irq = pdev->irq;
65 dev_dbg(dev, "USBSS-DEV physical base addr: %pa\n",
66 &rsrc_start);
67
68 priv_dev->dev = dev;
69
70 priv_dev->eps_supported = 0x000f000f;
71 priv_dev->onchip_tx_buf = 16;
72 priv_dev->onchip_rx_buf = 16;
73
74 ret = cdns2_gadget_init(priv_dev);
75 if (ret)
76 return ret;
77
78 pci_set_drvdata(pdev, priv_dev);
79
80 device_wakeup_enable(&pdev->dev);
81 if (pci_dev_run_wake(pdev))
82 pm_runtime_put_noidle(&pdev->dev);
83
84 return 0;
85 }
86
cdns2_pci_remove(struct pci_dev * pdev)87 static void cdns2_pci_remove(struct pci_dev *pdev)
88 {
89 struct cdns2_device *priv_dev = pci_get_drvdata(pdev);
90
91 if (pci_dev_run_wake(pdev))
92 pm_runtime_get_noresume(&pdev->dev);
93
94 cdns2_gadget_remove(priv_dev);
95 }
96
cdns2_pci_suspend(struct device * dev)97 static int cdns2_pci_suspend(struct device *dev)
98 {
99 struct cdns2_device *priv_dev = dev_get_drvdata(dev);
100
101 return cdns2_gadget_suspend(priv_dev);
102 }
103
cdns2_pci_resume(struct device * dev)104 static int cdns2_pci_resume(struct device *dev)
105 {
106 struct cdns2_device *priv_dev = dev_get_drvdata(dev);
107
108 return cdns2_gadget_resume(priv_dev, 1);
109 }
110
111 static const struct dev_pm_ops cdns2_pci_pm_ops = {
112 SYSTEM_SLEEP_PM_OPS(cdns2_pci_suspend, cdns2_pci_resume)
113 };
114
115 static const struct pci_device_id cdns2_pci_ids[] = {
116 { PCI_DEVICE(PCI_VENDOR_ID_CDNS, PCI_DEVICE_ID_CDNS_USB2),
117 .class = PCI_CLASS_SERIAL_USB_DEVICE },
118 { 0, }
119 };
120
121 static struct pci_driver cdns2_pci_driver = {
122 .name = "cdns2-pci",
123 .id_table = cdns2_pci_ids,
124 .probe = cdns2_pci_probe,
125 .remove = cdns2_pci_remove,
126 .driver = {
127 .pm = pm_ptr(&cdns2_pci_pm_ops),
128 }
129 };
130
131 module_pci_driver(cdns2_pci_driver);
132 MODULE_DEVICE_TABLE(pci, cdns2_pci_ids);
133
134 MODULE_ALIAS("pci:cdns2");
135 MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
136 MODULE_LICENSE("GPL");
137 MODULE_DESCRIPTION("Cadence CDNS2 PCI driver");
138