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 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
101 err_put_hcd:
102 usb_put_hcd(hcd);
103 fail:
104 dev_err(&pdev->dev, "init fail, %d\n", retval);
105
106 return retval;
107 }
108
npcm7xx_ehci_hcd_drv_remove(struct platform_device * pdev)109 static 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
120 static const struct of_device_id npcm7xx_ehci_id_table[] = {
121 { .compatible = "nuvoton,npcm750-ehci" },
122 { },
123 };
124 MODULE_DEVICE_TABLE(of, npcm7xx_ehci_id_table);
125
126 static 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
ehci_npcm7xx_init(void)138 static 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 }
146 module_init(ehci_npcm7xx_init);
147
ehci_npcm7xx_cleanup(void)148 static void __exit ehci_npcm7xx_cleanup(void)
149 {
150 platform_driver_unregister(&npcm7xx_ehci_hcd_driver);
151 }
152 module_exit(ehci_npcm7xx_cleanup);
153
154 MODULE_DESCRIPTION(DRIVER_DESC);
155 MODULE_ALIAS("platform:npcm7xx-ehci");
156 MODULE_AUTHOR("Avi Fishman");
157 MODULE_LICENSE("GPL v2");
158
