d31d9506e41ab0844cf04f5bbe1485972f8f62a4
[releases.git] / ehci-sh.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * SuperH EHCI host controller driver
4  *
5  * Copyright (C) 2010  Paul Mundt
6  *
7  * Based on ohci-sh.c and ehci-atmel.c.
8  */
9 #include <linux/platform_device.h>
10 #include <linux/clk.h>
11
12 struct ehci_sh_priv {
13         struct clk *iclk, *fclk;
14         struct usb_hcd *hcd;
15 };
16
17 static int ehci_sh_reset(struct usb_hcd *hcd)
18 {
19         struct ehci_hcd *ehci = hcd_to_ehci(hcd);
20
21         ehci->caps = hcd->regs;
22
23         return ehci_setup(hcd);
24 }
25
26 static const struct hc_driver ehci_sh_hc_driver = {
27         .description                    = hcd_name,
28         .product_desc                   = "SuperH EHCI",
29         .hcd_priv_size                  = sizeof(struct ehci_hcd),
30
31         /*
32          * generic hardware linkage
33          */
34         .irq                            = ehci_irq,
35         .flags                          = HCD_USB2 | HCD_DMA | HCD_MEMORY | HCD_BH,
36
37         /*
38          * basic lifecycle operations
39          */
40         .reset                          = ehci_sh_reset,
41         .start                          = ehci_run,
42         .stop                           = ehci_stop,
43         .shutdown                       = ehci_shutdown,
44
45         /*
46          * managing i/o requests and associated device resources
47          */
48         .urb_enqueue                    = ehci_urb_enqueue,
49         .urb_dequeue                    = ehci_urb_dequeue,
50         .endpoint_disable               = ehci_endpoint_disable,
51         .endpoint_reset                 = ehci_endpoint_reset,
52
53         /*
54          * scheduling support
55          */
56         .get_frame_number               = ehci_get_frame,
57
58         /*
59          * root hub support
60          */
61         .hub_status_data                = ehci_hub_status_data,
62         .hub_control                    = ehci_hub_control,
63
64 #ifdef CONFIG_PM
65         .bus_suspend                    = ehci_bus_suspend,
66         .bus_resume                     = ehci_bus_resume,
67 #endif
68
69         .relinquish_port                = ehci_relinquish_port,
70         .port_handed_over               = ehci_port_handed_over,
71         .clear_tt_buffer_complete       = ehci_clear_tt_buffer_complete,
72 };
73
74 static int ehci_hcd_sh_probe(struct platform_device *pdev)
75 {
76         struct resource *res;
77         struct ehci_sh_priv *priv;
78         struct usb_hcd *hcd;
79         int irq, ret;
80
81         if (usb_disabled())
82                 return -ENODEV;
83
84         irq = platform_get_irq(pdev, 0);
85         if (irq < 0) {
86                 ret = irq;
87                 goto fail_create_hcd;
88         }
89
90         /* initialize hcd */
91         hcd = usb_create_hcd(&ehci_sh_hc_driver, &pdev->dev,
92                              dev_name(&pdev->dev));
93         if (!hcd) {
94                 ret = -ENOMEM;
95                 goto fail_create_hcd;
96         }
97
98         hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
99         if (IS_ERR(hcd->regs)) {
100                 ret = PTR_ERR(hcd->regs);
101                 goto fail_request_resource;
102         }
103         hcd->rsrc_start = res->start;
104         hcd->rsrc_len = resource_size(res);
105
106         priv = devm_kzalloc(&pdev->dev, sizeof(struct ehci_sh_priv),
107                             GFP_KERNEL);
108         if (!priv) {
109                 ret = -ENOMEM;
110                 goto fail_request_resource;
111         }
112
113         /* These are optional, we don't care if they fail */
114         priv->fclk = devm_clk_get(&pdev->dev, "usb_fck");
115         if (IS_ERR(priv->fclk))
116                 priv->fclk = NULL;
117
118         priv->iclk = devm_clk_get(&pdev->dev, "usb_ick");
119         if (IS_ERR(priv->iclk))
120                 priv->iclk = NULL;
121
122         clk_enable(priv->fclk);
123         clk_enable(priv->iclk);
124
125         ret = usb_add_hcd(hcd, irq, IRQF_SHARED);
126         if (ret != 0) {
127                 dev_err(&pdev->dev, "Failed to add hcd");
128                 goto fail_add_hcd;
129         }
130         device_wakeup_enable(hcd->self.controller);
131
132         priv->hcd = hcd;
133         platform_set_drvdata(pdev, priv);
134
135         return ret;
136
137 fail_add_hcd:
138         clk_disable(priv->iclk);
139         clk_disable(priv->fclk);
140
141 fail_request_resource:
142         usb_put_hcd(hcd);
143 fail_create_hcd:
144         dev_err(&pdev->dev, "init %s fail, %d\n", dev_name(&pdev->dev), ret);
145
146         return ret;
147 }
148
149 static void ehci_hcd_sh_remove(struct platform_device *pdev)
150 {
151         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
152         struct usb_hcd *hcd = priv->hcd;
153
154         usb_remove_hcd(hcd);
155         usb_put_hcd(hcd);
156
157         clk_disable(priv->fclk);
158         clk_disable(priv->iclk);
159 }
160
161 static void ehci_hcd_sh_shutdown(struct platform_device *pdev)
162 {
163         struct ehci_sh_priv *priv = platform_get_drvdata(pdev);
164         struct usb_hcd *hcd = priv->hcd;
165
166         if (hcd->driver->shutdown)
167                 hcd->driver->shutdown(hcd);
168 }
169
170 static struct platform_driver ehci_hcd_sh_driver = {
171         .probe          = ehci_hcd_sh_probe,
172         .remove_new     = ehci_hcd_sh_remove,
173         .shutdown       = ehci_hcd_sh_shutdown,
174         .driver         = {
175                 .name   = "sh_ehci",
176         },
177 };
178
179 MODULE_ALIAS("platform:sh_ehci");