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
27 static struct hc_driver __read_mostly ehci_npcm7xx_hc_driver;
28
ehci_npcm7xx_drv_suspend(struct device * dev)29 static 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
ehci_npcm7xx_drv_resume(struct device * dev)37 static 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
45 static SIMPLE_DEV_PM_OPS(ehci_npcm7xx_pm_ops, ehci_npcm7xx_drv_suspend,
46 ehci_npcm7xx_drv_resume);
47
npcm7xx_ehci_hcd_drv_probe(struct platform_device * pdev)48 static 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 hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
83 if (IS_ERR(hcd->regs)) {
84 retval = PTR_ERR(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, irq, IRQF_SHARED);
94 if (retval)
95 goto err_put_hcd;
96
97 device_wakeup_enable(hcd->self.controller);
98 return retval;
99
100 err_put_hcd:
101 usb_put_hcd(hcd);
102 fail:
103 dev_err(&pdev->dev, "init fail, %d\n", retval);
104
105 return retval;
106 }
107
npcm7xx_ehci_hcd_drv_remove(struct platform_device * pdev)108 static 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
117 static const struct of_device_id npcm7xx_ehci_id_table[] = {
118 { .compatible = "nuvoton,npcm750-ehci" },
119 { },
120 };
121 MODULE_DEVICE_TABLE(of, npcm7xx_ehci_id_table);
122
123 static 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
ehci_npcm7xx_init(void)135 static int __init ehci_npcm7xx_init(void)
136 {
137 if (usb_disabled())
138 return -ENODEV;
139
140 ehci_init_driver(&ehci_npcm7xx_hc_driver, NULL);
141 return platform_driver_register(&npcm7xx_ehci_hcd_driver);
142 }
143 module_init(ehci_npcm7xx_init);
144
ehci_npcm7xx_cleanup(void)145 static void __exit ehci_npcm7xx_cleanup(void)
146 {
147 platform_driver_unregister(&npcm7xx_ehci_hcd_driver);
148 }
149 module_exit(ehci_npcm7xx_cleanup);
150
151 MODULE_DESCRIPTION(DRIVER_DESC);
152 MODULE_ALIAS("platform:npcm7xx-ehci");
153 MODULE_AUTHOR("Avi Fishman");
154 MODULE_LICENSE("GPL v2");
155