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
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/*
* 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
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*/
#include <linux/platform_device.h>
#include <linux/clk.h>
struct spear_ehci {
struct ehci_hcd ehci;
struct clk *clk;
};
#define to_spear_ehci(hcd) (struct spear_ehci *)hcd_to_ehci(hcd)
static void spear_start_ehci(struct spear_ehci *ehci)
{
clk_enable(ehci->clk);
}
static void spear_stop_ehci(struct spear_ehci *ehci)
{
clk_disable(ehci->clk);
}
static int ehci_spear_setup(struct usb_hcd *hcd)
{
struct ehci_hcd *ehci = hcd_to_ehci(hcd);
int retval = 0;
/* registers start at offset 0x0 */
ehci->caps = hcd->regs;
ehci->regs = hcd->regs + HC_LENGTH(ehci_readl(ehci,
&ehci->caps->hc_capbase));
/* cache this readonly data; minimize chip reads */
ehci->hcs_params = ehci_readl(ehci, &ehci->caps->hcs_params);
retval = ehci_halt(ehci);
if (retval)
return retval;
retval = ehci_init(hcd);
if (retval)
return retval;
ehci_reset(ehci);
ehci_port_power(ehci, 0);
return retval;
}
static const struct hc_driver ehci_spear_hc_driver = {
.description = hcd_name,
.product_desc = "SPEAr EHCI",
.hcd_priv_size = sizeof(struct spear_ehci),
/* generic hardware linkage */
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
/* basic lifecycle operations */
.reset = ehci_spear_setup,
.start = ehci_run,
.stop = ehci_stop,
.shutdown = ehci_shutdown,
/* managing i/o requests and associated device resources */
.urb_enqueue = ehci_urb_enqueue,
.urb_dequeue = ehci_urb_dequeue,
.endpoint_disable = ehci_endpoint_disable,
.endpoint_reset = ehci_endpoint_reset,
/* scheduling support */
.get_frame_number = ehci_get_frame,
/* root hub support */
.hub_status_data = ehci_hub_status_data,
.hub_control = ehci_hub_control,
.bus_suspend = ehci_bus_suspend,
.bus_resume = ehci_bus_resume,
.relinquish_port = ehci_relinquish_port,
.port_handed_over = ehci_port_handed_over,
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};
static int spear_ehci_hcd_drv_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd ;
struct spear_ehci *ehci;
struct resource *res;
struct clk *usbh_clk;
const struct hc_driver *driver = &ehci_spear_hc_driver;
int *pdata = pdev->dev.platform_data;
int irq, retval;
char clk_name[20] = "usbh_clk";
if (pdata == NULL)
return -EFAULT;
if (usb_disabled())
return -ENODEV;
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
retval = irq;
goto fail_irq_get;
}
if (*pdata >= 0)
sprintf(clk_name, "usbh.%01d_clk", *pdata);
usbh_clk = clk_get(NULL, clk_name);
if (IS_ERR(usbh_clk)) {
dev_err(&pdev->dev, "Error getting interface clock\n");
retval = PTR_ERR(usbh_clk);
goto fail_get_usbh_clk;
}
hcd = usb_create_hcd(driver, &pdev->dev, dev_name(&pdev->dev));
if (!hcd) {
retval = -ENOMEM;
goto fail_create_hcd;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
retval = -ENODEV;
goto fail_request_resource;
}
hcd->rsrc_start = res->start;
hcd->rsrc_len = resource_size(res);
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
driver->description)) {
retval = -EBUSY;
goto fail_request_resource;
}
hcd->regs = ioremap(hcd->rsrc_start, hcd->rsrc_len);
if (hcd->regs == NULL) {
dev_dbg(&pdev->dev, "error mapping memory\n");
retval = -ENOMEM;
goto fail_ioremap;
}
ehci = (struct spear_ehci *)hcd_to_ehci(hcd);
ehci->clk = usbh_clk;
spear_start_ehci(ehci);
retval = usb_add_hcd(hcd, irq, IRQF_SHARED | IRQF_DISABLED);
if (retval)
goto fail_add_hcd;
return retval;
fail_add_hcd:
spear_stop_ehci(ehci);
iounmap(hcd->regs);
fail_ioremap:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
fail_request_resource:
usb_put_hcd(hcd);
fail_create_hcd:
clk_put(usbh_clk);
fail_get_usbh_clk:
fail_irq_get:
dev_err(&pdev->dev, "init fail, %d\n", retval);
return retval ;
}
static int spear_ehci_hcd_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct spear_ehci *ehci_p = to_spear_ehci(hcd);
if (!hcd)
return 0;
if (in_interrupt())
BUG();
usb_remove_hcd(hcd);
if (ehci_p->clk)
spear_stop_ehci(ehci_p);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
if (ehci_p->clk)
clk_put(ehci_p->clk);
return 0;
}
static struct platform_driver spear_ehci_hcd_driver = {
.probe = spear_ehci_hcd_drv_probe,
.remove = spear_ehci_hcd_drv_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.name = "spear-ehci",
.bus = &platform_bus_type
}
};
MODULE_ALIAS("platform:spear-ehci");
|
