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
|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2012 Tilera Corporation. All Rights Reserved.
*
* 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, version 2.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for
* more details.
*/
/*
* Tilera TILE-Gx USB OHCI host controller driver.
*/
#include <linux/irq.h>
#include <linux/platform_device.h>
#include <linux/usb/tilegx.h>
#include <linux/usb.h>
#include <asm/homecache.h>
#include <gxio/iorpc_usb_host.h>
#include <gxio/usb_host.h>
static void tilegx_start_ohc(void)
{
}
static void tilegx_stop_ohc(void)
{
}
static int tilegx_ohci_start(struct usb_hcd *hcd)
{
struct ohci_hcd *ohci = hcd_to_ohci(hcd);
int ret;
ret = ohci_init(ohci);
if (ret < 0)
return ret;
ret = ohci_run(ohci);
if (ret < 0) {
dev_err(hcd->self.controller, "can't start %s\n",
hcd->self.bus_name);
ohci_stop(hcd);
return ret;
}
return 0;
}
static const struct hc_driver ohci_tilegx_hc_driver = {
.description = hcd_name,
.product_desc = "Tile-Gx OHCI",
.hcd_priv_size = sizeof(struct ohci_hcd),
/*
* Generic hardware linkage.
*/
.irq = ohci_irq,
.flags = HCD_MEMORY | HCD_LOCAL_MEM | HCD_USB11,
/*
* Basic lifecycle operations.
*/
.start = tilegx_ohci_start,
.stop = ohci_stop,
.shutdown = ohci_shutdown,
/*
* Managing I/O requests and associated device resources.
*/
.urb_enqueue = ohci_urb_enqueue,
.urb_dequeue = ohci_urb_dequeue,
.endpoint_disable = ohci_endpoint_disable,
/*
* Scheduling support.
*/
.get_frame_number = ohci_get_frame,
/*
* Root hub support.
*/
.hub_status_data = ohci_hub_status_data,
.hub_control = ohci_hub_control,
.start_port_reset = ohci_start_port_reset,
};
static int ohci_hcd_tilegx_drv_probe(struct platform_device *pdev)
{
struct usb_hcd *hcd;
struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
pte_t pte = { 0 };
int my_cpu = smp_processor_id();
int ret;
if (usb_disabled())
return -ENODEV;
/*
* Try to initialize our GXIO context; if we can't, the device
* doesn't exist.
*/
if (gxio_usb_host_init(&pdata->usb_ctx, pdata->dev_index, 0) != 0)
return -ENXIO;
hcd = usb_create_hcd(&ohci_tilegx_hc_driver, &pdev->dev,
dev_name(&pdev->dev));
if (!hcd) {
ret = -ENOMEM;
goto err_hcd;
}
/*
* We don't use rsrc_start to map in our registers, but seems like
* we ought to set it to something, so we use the register VA.
*/
hcd->rsrc_start =
(ulong) gxio_usb_host_get_reg_start(&pdata->usb_ctx);
hcd->rsrc_len = gxio_usb_host_get_reg_len(&pdata->usb_ctx);
hcd->regs = gxio_usb_host_get_reg_start(&pdata->usb_ctx);
tilegx_start_ohc();
/* Create our IRQs and register them. */
pdata->irq = irq_alloc_hwirq(-1);
if (!pdata->irq) {
ret = -ENXIO;
goto err_no_irq;
}
tile_irq_activate(pdata->irq, TILE_IRQ_PERCPU);
/* Configure interrupts. */
ret = gxio_usb_host_cfg_interrupt(&pdata->usb_ctx,
cpu_x(my_cpu), cpu_y(my_cpu),
KERNEL_PL, pdata->irq);
if (ret) {
ret = -ENXIO;
goto err_have_irq;
}
/* Register all of our memory. */
pte = pte_set_home(pte, PAGE_HOME_HASH);
ret = gxio_usb_host_register_client_memory(&pdata->usb_ctx, pte, 0);
if (ret) {
ret = -ENXIO;
goto err_have_irq;
}
ohci_hcd_init(hcd_to_ohci(hcd));
ret = usb_add_hcd(hcd, pdata->irq, IRQF_SHARED);
if (ret == 0) {
platform_set_drvdata(pdev, hcd);
device_wakeup_enable(hcd->self.controller);
return ret;
}
err_have_irq:
irq_free_hwirq(pdata->irq);
err_no_irq:
tilegx_stop_ohc();
usb_put_hcd(hcd);
err_hcd:
gxio_usb_host_destroy(&pdata->usb_ctx);
return ret;
}
static int ohci_hcd_tilegx_drv_remove(struct platform_device *pdev)
{
struct usb_hcd *hcd = platform_get_drvdata(pdev);
struct tilegx_usb_platform_data *pdata = dev_get_platdata(&pdev->dev);
usb_remove_hcd(hcd);
usb_put_hcd(hcd);
tilegx_stop_ohc();
gxio_usb_host_destroy(&pdata->usb_ctx);
irq_free_hwirq(pdata->irq);
return 0;
}
static void ohci_hcd_tilegx_drv_shutdown(struct platform_device *pdev)
{
usb_hcd_platform_shutdown(pdev);
ohci_hcd_tilegx_drv_remove(pdev);
}
static struct platform_driver ohci_hcd_tilegx_driver = {
.probe = ohci_hcd_tilegx_drv_probe,
.remove = ohci_hcd_tilegx_drv_remove,
.shutdown = ohci_hcd_tilegx_drv_shutdown,
.driver = {
.name = "tilegx-ohci",
}
};
MODULE_ALIAS("platform:tilegx-ohci");
|
