3d3317a1a0b3fd6c12ecd3479c4aab3b3ad829a3
[releases.git] / ehci-npcm7xx.c
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
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
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
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
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
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
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");