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 
23 static 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 
88 static 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 
98 static 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 
105 static 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 
112 static const struct dev_pm_ops cdns2_pci_pm_ops = {
113 	SYSTEM_SLEEP_PM_OPS(cdns2_pci_suspend, cdns2_pci_resume)
114 };
115 
116 static 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 
122 static 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 
132 module_pci_driver(cdns2_pci_driver);
133 MODULE_DEVICE_TABLE(pci, cdns2_pci_ids);
134 
135 MODULE_ALIAS("pci:cdns2");
136 MODULE_AUTHOR("Pawel Laszczak <pawell@cadence.com>");
137 MODULE_LICENSE("GPL");
138 MODULE_DESCRIPTION("Cadence CDNS2 PCI driver");
139