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
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
|
/*
* Driver for EHCI UHP on Atmel chips
*
* Copyright (C) 2009 Atmel Corporation,
* Nicolas Ferre <nicolas.ferre@atmel.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/clk.h>
#include <linux/platform_device.h>
/* interface and function clocks */
static struct clk *iclk, *fclk;
static int clocked;
/*-------------------------------------------------------------------------*/
static void atmel_start_clock(void)
{
clk_enable(iclk);
clk_enable(fclk);
clocked = 1;
}
static void atmel_stop_clock(void)
{
clk_disable(fclk);
clk_disable(iclk);
clocked = 0;
}
static void atmel_start_ehci(struct platform_device *pdev)
{
dev_dbg(&pdev->dev, "start\n");
atmel_start_clock();
}
static void atmel_stop_ehci(struct platform_device *pdev)
{
dev_dbg(&pdev->dev, "stop\n");
atmel_stop_clock();
}
/*-------------------------------------------------------------------------*/
static int ehci_atmel_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));
dbg_hcs_params(ehci, "reset");
dbg_hcc_params(ehci, "reset");
/* 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;
/* data structure init */
retval = ehci_init(hcd);
if (retval)
return retval;
ehci->sbrn = 0x20;
ehci_reset(ehci);
ehci_port_power(ehci, 0);
return retval;
}
static const struct hc_driver ehci_atmel_hc_driver = {
.description = hcd_name,
.product_desc = "Atmel EHCI UHP HS",
.hcd_priv_size = sizeof(struct ehci_hcd),
/* generic hardware linkage */
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2,
/* basic lifecycle operations */
.reset = ehci_atmel_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,
/* 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,
};
static int __init ehci_atmel_drv_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd;
const struct hc_driver *driver = &ehci_atmel_hc_driver;
struct resource *res;
int irq;
int retval;
if (usb_disabled())
return -ENODEV;
pr_debug("Initializing Atmel-SoC USB Host Controller\n");
irq = platform_get_irq(pdev, 0);
if (irq <= 0) {
dev_err(&pdev->dev,
"Found HC with no IRQ. Check %s setup!\n",
dev_name(&pdev->dev));
retval = -ENODEV;
goto fail_create_hcd;
}
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) {
dev_err(&pdev->dev,
"Found HC with no register addr. Check %s setup!\n",
dev_name(&pdev->dev));
retval = -ENODEV;
goto fail_request_resource;
}
hcd->rsrc_start = res->start;
hcd->rsrc_len = res->end - res->start + 1;
if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len,
driver->description)) {
dev_dbg(&pdev->dev, "controller already in use\n");
retval = -EBUSY;
goto fail_request_resource;
}
hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
if (hcd->regs == NULL) {
dev_dbg(&pdev->dev, "error mapping memory\n");
retval = -EFAULT;
goto fail_ioremap;
}
iclk = clk_get(&pdev->dev, "ehci_clk");
if (IS_ERR(iclk)) {
dev_err(&pdev->dev, "Error getting interface clock\n");
retval = -ENOENT;
goto fail_get_iclk;
}
fclk = clk_get(&pdev->dev, "uhpck");
if (IS_ERR(fclk)) {
dev_err(&pdev->dev, "Error getting function clock\n");
retval = -ENOENT;
goto fail_get_fclk;
}
atmel_start_ehci(pdev);
retval = usb_add_hcd(hcd, irq, IRQF_SHARED);
if (retval)
goto fail_add_hcd;
return retval;
fail_add_hcd:
atmel_stop_ehci(pdev);
clk_put(fclk);
fail_get_fclk:
clk_put(iclk);
fail_get_iclk:
iounmap(hcd->regs);
fail_ioremap:
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
fail_request_resource:
usb_put_hcd(hcd);
fail_create_hcd:
dev_err(&pdev->dev, "init %s fail, %d\n",
dev_name(&pdev->dev), retval);
return retval;
}
static int __exit ehci_atmel_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
ehci_shutdown(hcd);
usb_remove_hcd(hcd);
iounmap(hcd->regs);
release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
usb_put_hcd(hcd);
atmel_stop_ehci(pdev);
clk_put(fclk);
clk_put(iclk);
fclk = iclk = NULL;
return 0;
}
static struct platform_driver ehci_atmel_driver = {
.probe = ehci_atmel_drv_probe,
.remove = __exit_p(ehci_atmel_drv_remove),
.shutdown = usb_hcd_platform_shutdown,
.driver.name = "atmel-ehci",
};
|
