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
231
232
233
234
235
236
237
238
239
240
241
242
|
// SPDX-License-Identifier: GPL-2.0+
/*
* EHCI HCD (Host Controller Driver) for USB.
*
* Bus Glue for Xilinx EHCI core on the of_platform bus
*
* Copyright (c) 2009 Xilinx, Inc.
*
* Based on "ehci-ppc-of.c" by Valentine Barshak <vbarshak@ru.mvista.com>
* and "ehci-ppc-soc.c" by Stefan Roese <sr@denx.de>
* and "ohci-ppc-of.c" by Sylvain Munaut <tnt@246tNt.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <linux/err.h>
#include <linux/signal.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
/**
* ehci_xilinx_port_handed_over - hand the port out if failed to enable it
* @hcd: Pointer to the usb_hcd device to which the host controller bound
* @portnum:Port number to which the device is attached.
*
* This function is used as a place to tell the user that the Xilinx USB host
* controller does support LS devices. And in an HS only configuration, it
* does not support FS devices either. It is hoped that this can help a
* confused user.
*
* There are cases when the host controller fails to enable the port due to,
* for example, insufficient power that can be supplied to the device from
* the USB bus. In those cases, the messages printed here are not helpful.
*/
static int ehci_xilinx_port_handed_over(struct usb_hcd *hcd, int portnum)
{
dev_warn(hcd->self.controller, "port %d cannot be enabled\n", portnum);
if (hcd->has_tt) {
dev_warn(hcd->self.controller,
"Maybe you have connected a low speed device?\n");
dev_warn(hcd->self.controller,
"We do not support low speed devices\n");
} else {
dev_warn(hcd->self.controller,
"Maybe your device is not a high speed device?\n");
dev_warn(hcd->self.controller,
"The USB host controller does not support full speed "
"nor low speed devices\n");
dev_warn(hcd->self.controller,
"You can reconfigure the host controller to have "
"full speed support\n");
}
return 0;
}
static const struct hc_driver ehci_xilinx_of_hc_driver = {
.description = hcd_name,
.product_desc = "OF EHCI",
.hcd_priv_size = sizeof(struct ehci_hcd),
/*
* generic hardware linkage
*/
.irq = ehci_irq,
.flags = HCD_MEMORY | HCD_USB2 | HCD_BH,
/*
* basic lifecycle operations
*/
.reset = ehci_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,
#ifdef CONFIG_PM
.bus_suspend = ehci_bus_suspend,
.bus_resume = ehci_bus_resume,
#endif
.relinquish_port = NULL,
.port_handed_over = ehci_xilinx_port_handed_over,
.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
};
/**
* ehci_hcd_xilinx_of_probe - Probe method for the USB host controller
* @op: pointer to the platform_device bound to the host controller
*
* This function requests resources and sets up appropriate properties for the
* host controller. Because the Xilinx USB host controller can be configured
* as HS only or HS/FS only, it checks the configuration in the device tree
* entry, and sets an appropriate value for hcd->has_tt.
*/
static int ehci_hcd_xilinx_of_probe(struct platform_device *op)
{
struct device_node *dn = op->dev.of_node;
struct usb_hcd *hcd;
struct ehci_hcd *ehci;
struct resource res;
int irq;
int rv;
int *value;
if (usb_disabled())
return -ENODEV;
dev_dbg(&op->dev, "initializing XILINX-OF USB Controller\n");
rv = of_address_to_resource(dn, 0, &res);
if (rv)
return rv;
hcd = usb_create_hcd(&ehci_xilinx_of_hc_driver, &op->dev,
"XILINX-OF USB");
if (!hcd)
return -ENOMEM;
hcd->rsrc_start = res.start;
hcd->rsrc_len = resource_size(&res);
irq = irq_of_parse_and_map(dn, 0);
if (!irq) {
dev_err(&op->dev, "%s: irq_of_parse_and_map failed\n",
__FILE__);
rv = -EBUSY;
goto err_irq;
}
hcd->regs = devm_ioremap_resource(&op->dev, &res);
if (IS_ERR(hcd->regs)) {
rv = PTR_ERR(hcd->regs);
goto err_irq;
}
ehci = hcd_to_ehci(hcd);
/* This core always has big-endian register interface and uses
* big-endian memory descriptors.
*/
ehci->big_endian_mmio = 1;
ehci->big_endian_desc = 1;
/* Check whether the FS support option is selected in the hardware.
*/
value = (int *)of_get_property(dn, "xlnx,support-usb-fs", NULL);
if (value && (*value == 1)) {
ehci_dbg(ehci, "USB host controller supports FS devices\n");
hcd->has_tt = 1;
} else {
ehci_dbg(ehci,
"USB host controller is HS only\n");
hcd->has_tt = 0;
}
/* Debug registers are at the first 0x100 region
*/
ehci->caps = hcd->regs + 0x100;
rv = usb_add_hcd(hcd, irq, 0);
if (rv == 0) {
device_wakeup_enable(hcd->self.controller);
return 0;
}
err_irq:
usb_put_hcd(hcd);
return rv;
}
/**
* ehci_hcd_xilinx_of_remove - shutdown hcd and release resources
* @op: pointer to platform_device structure that is to be removed
*
* Remove the hcd structure, and release resources that has been requested
* during probe.
*/
static int ehci_hcd_xilinx_of_remove(struct platform_device *op)
{
struct usb_hcd *hcd = platform_get_drvdata(op);
dev_dbg(&op->dev, "stopping XILINX-OF USB Controller\n");
usb_remove_hcd(hcd);
usb_put_hcd(hcd);
return 0;
}
static const struct of_device_id ehci_hcd_xilinx_of_match[] = {
{.compatible = "xlnx,xps-usb-host-1.00.a",},
{},
};
MODULE_DEVICE_TABLE(of, ehci_hcd_xilinx_of_match);
static struct platform_driver ehci_hcd_xilinx_of_driver = {
.probe = ehci_hcd_xilinx_of_probe,
.remove = ehci_hcd_xilinx_of_remove,
.shutdown = usb_hcd_platform_shutdown,
.driver = {
.name = "xilinx-of-ehci",
.of_match_table = ehci_hcd_xilinx_of_match,
},
};
|
