1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Nuvoton NPCM7xx driver for EHCI HCD
4 *
5 * Copyright (C) 2018 Nuvoton Technologies,
6 * Avi Fishman <avi.fishman@nuvoton.com> <avifishman70@gmail.com>
7 * Tomer Maimon <tomer.maimon@nuvoton.com> <tmaimon77@gmail.com>
8 *
9 * Based on various ehci-spear.c driver
10 */
11
12
13#include <linux/dma-mapping.h>
14
15#include <linux/kernel.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/platform_device.h>
19#include <linux/pm.h>
20#include <linux/usb.h>
21#include <linux/usb/hcd.h>
22
23#include "ehci.h"
24
25#define DRIVER_DESC "EHCI npcm7xx driver"
26
27static struct hc_driver __read_mostly ehci_npcm7xx_hc_driver;
28
29static int __maybe_unused ehci_npcm7xx_drv_suspend(struct device *dev)
30{
31 struct usb_hcd *hcd = dev_get_drvdata(dev);
32 bool do_wakeup = device_may_wakeup(dev);
33
34 return ehci_suspend(hcd, do_wakeup);
35}
36
37static int __maybe_unused ehci_npcm7xx_drv_resume(struct device *dev)
38{
39 struct usb_hcd *hcd = dev_get_drvdata(dev);
40
41 ehci_resume(hcd, force_reset: false);
42 return 0;
43}
44
45static SIMPLE_DEV_PM_OPS(ehci_npcm7xx_pm_ops, ehci_npcm7xx_drv_suspend,
46 ehci_npcm7xx_drv_resume);
47
48static int npcm7xx_ehci_hcd_drv_probe(struct platform_device *pdev)
49{
50 struct usb_hcd *hcd;
51 struct resource *res;
52 const struct hc_driver *driver = &ehci_npcm7xx_hc_driver;
53 int irq;
54 int retval;
55
56 dev_dbg(&pdev->dev, "initializing npcm7xx ehci USB Controller\n");
57
58 if (usb_disabled())
59 return -ENODEV;
60
61 irq = platform_get_irq(pdev, 0);
62 if (irq < 0) {
63 retval = irq;
64 goto fail;
65 }
66
67 /*
68 * Right now device-tree probed devices don't get dma_mask set.
69 * Since shared usb code relies on it, set it here for now.
70 * Once we have dma capability bindings this can go away.
71 */
72 retval = dma_coerce_mask_and_coherent(dev: &pdev->dev, DMA_BIT_MASK(32));
73 if (retval)
74 goto fail;
75
76 hcd = usb_create_hcd(driver, dev: &pdev->dev, bus_name: dev_name(dev: &pdev->dev));
77 if (!hcd) {
78 retval = -ENOMEM;
79 goto fail;
80 }
81
82 hcd->regs = devm_platform_get_and_ioremap_resource(pdev, index: 0, res: &res);
83 if (IS_ERR(ptr: hcd->regs)) {
84 retval = PTR_ERR(ptr: hcd->regs);
85 goto err_put_hcd;
86 }
87 hcd->rsrc_start = res->start;
88 hcd->rsrc_len = resource_size(res);
89
90 /* registers start at offset 0x0 */
91 hcd_to_ehci(hcd)->caps = hcd->regs;
92
93 retval = usb_add_hcd(hcd, irqnum: irq, IRQF_SHARED);
94 if (retval)
95 goto err_put_hcd;
96
97 device_wakeup_enable(dev: hcd->self.controller);
98 return retval;
99
100err_put_hcd:
101 usb_put_hcd(hcd);
102fail:
103 dev_err(&pdev->dev, "init fail, %d\n", retval);
104
105 return retval;
106}
107
108static void npcm7xx_ehci_hcd_drv_remove(struct platform_device *pdev)
109{
110 struct usb_hcd *hcd = platform_get_drvdata(pdev);
111
112 usb_remove_hcd(hcd);
113
114 usb_put_hcd(hcd);
115}
116
117static const struct of_device_id npcm7xx_ehci_id_table[] = {
118 { .compatible = "nuvoton,npcm750-ehci" },
119 { },
120};
121MODULE_DEVICE_TABLE(of, npcm7xx_ehci_id_table);
122
123static struct platform_driver npcm7xx_ehci_hcd_driver = {
124 .probe = npcm7xx_ehci_hcd_drv_probe,
125 .remove_new = npcm7xx_ehci_hcd_drv_remove,
126 .shutdown = usb_hcd_platform_shutdown,
127 .driver = {
128 .name = "npcm7xx-ehci",
129 .bus = &platform_bus_type,
130 .pm = pm_ptr(&ehci_npcm7xx_pm_ops),
131 .of_match_table = npcm7xx_ehci_id_table,
132 }
133};
134
135static int __init ehci_npcm7xx_init(void)
136{
137 if (usb_disabled())
138 return -ENODEV;
139
140 ehci_init_driver(drv: &ehci_npcm7xx_hc_driver, NULL);
141 return platform_driver_register(&npcm7xx_ehci_hcd_driver);
142}
143module_init(ehci_npcm7xx_init);
144
145static void __exit ehci_npcm7xx_cleanup(void)
146{
147 platform_driver_unregister(&npcm7xx_ehci_hcd_driver);
148}
149module_exit(ehci_npcm7xx_cleanup);
150
151MODULE_DESCRIPTION(DRIVER_DESC);
152MODULE_ALIAS("platform:npcm7xx-ehci");
153MODULE_AUTHOR("Avi Fishman");
154MODULE_LICENSE("GPL v2");
155

source code of linux/drivers/usb/host/ehci-npcm7xx.c