tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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, 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(&pdev->dev, DMA_BIT_MASK(32));
73 if (retval)
74 goto fail;
75
76 hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
77 if (!hcd) {
78 retval = -ENOMEM;
79 goto fail;
80 }
81
82 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
83 hcd->regs = devm_ioremap_resource(&pdev->dev, res);
84 if (IS_ERR(hcd->regs)) {
85 retval = PTR_ERR(hcd->regs);
86 goto err_put_hcd;
87 }
88 hcd->rsrc_start = res->start;
89 hcd->rsrc_len = resource_size(res);
90
91 /* registers start at offset 0x0 */
92 hcd_to_ehci(hcd)->caps = hcd->regs;
93
94 retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
95 if (retval)
96 goto err_put_hcd;
97
98 device_wakeup_enable(hcd->self.controller);
99 return retval;
100
101err_put_hcd:
102 usb_put_hcd(hcd);
103fail:
104 dev_err(&pdev->dev, "init fail, %d\n", retval);
105
106 return retval;
107}
108
109static int npcm7xx_ehci_hcd_drv_remove(struct platform_device *pdev)
110{
111 struct usb_hcd *hcd = platform_get_drvdata(pdev);
112
113 usb_remove_hcd(hcd);
114
115 usb_put_hcd(hcd);
116
117 return 0;
118}
119
120static const struct of_device_id npcm7xx_ehci_id_table[] = {
121 { .compatible = "nuvoton,npcm750-ehci" },
122 { },
123};
124MODULE_DEVICE_TABLE(of, npcm7xx_ehci_id_table);
125
126static struct platform_driver npcm7xx_ehci_hcd_driver = {
127 .probe = npcm7xx_ehci_hcd_drv_probe,
128 .remove = npcm7xx_ehci_hcd_drv_remove,
129 .shutdown = usb_hcd_platform_shutdown,
130 .driver = {
131 .name = "npcm7xx-ehci",
132 .bus = &platform_bus_type,
133 .pm = pm_ptr(&ehci_npcm7xx_pm_ops),
134 .of_match_table = npcm7xx_ehci_id_table,
135 }
136};
137
138static int __init ehci_npcm7xx_init(void)
139{
140 if (usb_disabled())
141 return -ENODEV;
142
143 ehci_init_driver(&ehci_npcm7xx_hc_driver, NULL);
144 return platform_driver_register(&npcm7xx_ehci_hcd_driver);
145}
146module_init(ehci_npcm7xx_init);
147
148static void __exit ehci_npcm7xx_cleanup(void)
149{
150 platform_driver_unregister(&npcm7xx_ehci_hcd_driver);
151}
152module_exit(ehci_npcm7xx_cleanup);
153
154MODULE_DESCRIPTION(DRIVER_DESC);
155MODULE_ALIAS("platform:npcm7xx-ehci");
156MODULE_AUTHOR("Avi Fishman");
157MODULE_LICENSE("GPL v2");