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
|
/*
* Ingenic JZ4740 "glue layer"
*
* Copyright (C) 2013, Apelete Seketeli <apelete@seketeli.net>
*
* 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.
*
* 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/clk.h>
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/usb/usb_phy_generic.h>
#include "musb_core.h"
struct jz4740_glue {
struct device *dev;
struct platform_device *musb;
struct clk *clk;
};
static irqreturn_t jz4740_musb_interrupt(int irq, void *__hci)
{
unsigned long flags;
irqreturn_t retval = IRQ_NONE;
struct musb *musb = __hci;
spin_lock_irqsave(&musb->lock, flags);
musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
/*
* The controller is gadget only, the state of the host mode IRQ bits is
* undefined. Mask them to make sure that the musb driver core will
* never see them set
*/
musb->int_usb &= MUSB_INTR_SUSPEND | MUSB_INTR_RESUME |
MUSB_INTR_RESET | MUSB_INTR_SOF;
if (musb->int_usb || musb->int_tx || musb->int_rx)
retval = musb_interrupt(musb);
spin_unlock_irqrestore(&musb->lock, flags);
return retval;
}
static struct musb_fifo_cfg jz4740_musb_fifo_cfg[] = {
{ .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, },
{ .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, },
{ .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 64, },
};
static struct musb_hdrc_config jz4740_musb_config = {
/* Silicon does not implement USB OTG. */
.multipoint = 0,
/* Max EPs scanned, driver will decide which EP can be used. */
.num_eps = 4,
/* RAMbits needed to configure EPs from table */
.ram_bits = 9,
.fifo_cfg = jz4740_musb_fifo_cfg,
.fifo_cfg_size = ARRAY_SIZE(jz4740_musb_fifo_cfg),
};
static struct musb_hdrc_platform_data jz4740_musb_platform_data = {
.mode = MUSB_PERIPHERAL,
.config = &jz4740_musb_config,
};
static int jz4740_musb_init(struct musb *musb)
{
usb_phy_generic_register();
musb->xceiv = usb_get_phy(USB_PHY_TYPE_USB2);
if (!musb->xceiv) {
pr_err("HS UDC: no transceiver configured\n");
return -ENODEV;
}
/* Silicon does not implement ConfigData register.
* Set dyn_fifo to avoid reading EP config from hardware.
*/
musb->dyn_fifo = true;
musb->isr = jz4740_musb_interrupt;
return 0;
}
static int jz4740_musb_exit(struct musb *musb)
{
usb_put_phy(musb->xceiv);
return 0;
}
static const struct musb_platform_ops jz4740_musb_ops = {
.quirks = MUSB_INDEXED_EP,
.fifo_mode = 2,
.init = jz4740_musb_init,
.exit = jz4740_musb_exit,
};
static int jz4740_probe(struct platform_device *pdev)
{
struct musb_hdrc_platform_data *pdata = &jz4740_musb_platform_data;
struct platform_device *musb;
struct jz4740_glue *glue;
struct clk *clk;
int ret;
glue = devm_kzalloc(&pdev->dev, sizeof(*glue), GFP_KERNEL);
if (!glue)
return -ENOMEM;
musb = platform_device_alloc("musb-hdrc", PLATFORM_DEVID_AUTO);
if (!musb) {
dev_err(&pdev->dev, "failed to allocate musb device\n");
return -ENOMEM;
}
clk = devm_clk_get(&pdev->dev, "udc");
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "failed to get clock\n");
ret = PTR_ERR(clk);
goto err_platform_device_put;
}
ret = clk_prepare_enable(clk);
if (ret) {
dev_err(&pdev->dev, "failed to enable clock\n");
goto err_platform_device_put;
}
musb->dev.parent = &pdev->dev;
glue->dev = &pdev->dev;
glue->musb = musb;
glue->clk = clk;
pdata->platform_ops = &jz4740_musb_ops;
platform_set_drvdata(pdev, glue);
ret = platform_device_add_resources(musb, pdev->resource,
pdev->num_resources);
if (ret) {
dev_err(&pdev->dev, "failed to add resources\n");
goto err_clk_disable;
}
ret = platform_device_add_data(musb, pdata, sizeof(*pdata));
if (ret) {
dev_err(&pdev->dev, "failed to add platform_data\n");
goto err_clk_disable;
}
ret = platform_device_add(musb);
if (ret) {
dev_err(&pdev->dev, "failed to register musb device\n");
goto err_clk_disable;
}
return 0;
err_clk_disable:
clk_disable_unprepare(clk);
err_platform_device_put:
platform_device_put(musb);
return ret;
}
static int jz4740_remove(struct platform_device *pdev)
{
struct jz4740_glue *glue = platform_get_drvdata(pdev);
platform_device_unregister(glue->musb);
usb_phy_generic_unregister(pdev);
clk_disable_unprepare(glue->clk);
return 0;
}
static struct platform_driver jz4740_driver = {
.probe = jz4740_probe,
.remove = jz4740_remove,
.driver = {
.name = "musb-jz4740",
},
};
MODULE_DESCRIPTION("JZ4740 MUSB Glue Layer");
MODULE_AUTHOR("Apelete Seketeli <apelete@seketeli.net>");
MODULE_LICENSE("GPL v2");
module_platform_driver(jz4740_driver);
|
