1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
// SPDX-License-Identifier: GPL-2.0
/*
* Driver for EHCI HCD on SPEAr SOC
*
* Copyright (C) 2010 ST Micro Electronics,
* Deepak Sikri <deepak.sikri@st.com>
*
* Based on various ehci-*.c drivers
*/
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/usb.h>
#include <linux/usb/hcd.h>
#include "ehci.h"
#define DRIVER_DESC "EHCI SPEAr driver"
struct spear_ehci {
struct clk *clk;
};
#define to_spear_ehci(hcd) (struct spear_ehci *)(hcd_to_ehci(hcd)->priv)
static struct hc_driver __read_mostly ehci_spear_hc_driver;
static int __maybe_unused ehci_spear_drv_suspend(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
bool do_wakeup = device_may_wakeup(dev);
return ehci_suspend(hcd, do_wakeup);
}
static int __maybe_unused ehci_spear_drv_resume(struct device *dev)
{
struct usb_hcd *hcd = dev_get_drvdata(dev);
ehci_resume(hcd, false);
return 0;
}
static SIMPLE_DEV_PM_OPS(ehci_spear_pm_ops, ehci_spear_drv_suspend,
ehci_spear_drv_resume);
static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd ;
struct spear_ehci *sehci;
struct resource *res;
struct clk *usbh_clk;
const struct hc_driver *driver = &ehci_spear_hc_driver;
int irq, retval;
if (usb_disabled())
return -ENODEV;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
retval = irq;
goto fail;
}
/*
* Right now device-tree probed devices don't get dma_mask set.
* Since shared usb code relies on it, set it here for now.
* Once we have dma capability bindings this can go away.
*/
retval = dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
if (retval)
goto fail;
usbh_clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(usbh_clk)) {
dev_err(&pdev->dev, "Error getting interface clock\n");
retval = PTR_ERR(usbh_clk);
goto fail;
}
hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
if (!hcd) {
retval = -ENOMEM;
goto fail;
}
hcd->regs = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
if (IS_ERR(hcd->regs)) {
retval = PTR_ERR(hcd->regs);
goto err_put_hcd;
}
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
sehci = to_spear_ehci(hcd);
sehci->clk = usbh_clk;
/* registers start at offset 0x0 */
hcd_to_ehci(hcd)->caps = hcd->regs;
clk_prepare_enable(sehci->clk);
retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (retval)
goto err_stop_ehci;
device_wakeup_enable(hcd->self.controller);
return retval;
err_stop_ehci:
clk_disable_unprepare(sehci->clk);
err_put_hcd:
usb_put_hcd(hcd);
fail:
dev_err(&pdev->dev, "init fail, %d\n", retval);
return retval ;
}
static void spear_ehci_hcd_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct spear_ehci *sehci = to_spear_ehci(hcd);
usb_remove_hcd(hcd);
if (sehci->clk)
clk_disable_unprepare(sehci->clk);
usb_put_hcd(hcd);
}
static const struct of_device_id spear_ehci_id_table[] = {
{ .compatible = "st,spear600-ehci", },
{ },
};
MODULE_DEVICE_TABLE(of, spear_ehci_id_table);
static struct platform_driver spear_ehci_hcd_driver = {
.probe = spear_ehci_hcd_drv_probe,
.remove_new = spear_ehci_hcd_drv_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.name = "spear-ehci",
.bus = &platform_bus_type,
.pm = pm_ptr(&ehci_spear_pm_ops),
.of_match_table = spear_ehci_id_table,
}
};
static const struct ehci_driver_overrides spear_overrides __initconst = {
.extra_priv_size = sizeof(struct spear_ehci),
};
static int __init ehci_spear_init(void)
{
if (usb_disabled())
return -ENODEV;
ehci_init_driver(&ehci_spear_hc_driver, &spear_overrides);
return platform_driver_register(&spear_ehci_hcd_driver);
}
module_init(ehci_spear_init);
static void __exit ehci_spear_cleanup(void)
{
platform_driver_unregister(&spear_ehci_hcd_driver);
}
module_exit(ehci_spear_cleanup);
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_ALIAS("platform:spear-ehci");
MODULE_AUTHOR("Deepak Sikri");
MODULE_LICENSE("GPL");
|
