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
|
// SPDX-License-Identifier: GPL-2.0-only
/**
* tusb1210.c - TUSB1210 USB ULPI PHY driver
*
* Copyright (C) 2015 Intel Corporation
*
* Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
*/
#include <linux/module.h>
#include <linux/ulpi/driver.h>
#include <linux/ulpi/regs.h>
#include <linux/gpio/consumer.h>
#include <linux/phy/ulpi_phy.h>
#define TUSB1210_VENDOR_SPECIFIC2 0x80
#define TUSB1210_VENDOR_SPECIFIC2_IHSTX_SHIFT 0
#define TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_SHIFT 4
#define TUSB1210_VENDOR_SPECIFIC2_DP_SHIFT 6
struct tusb1210 {
struct ulpi *ulpi;
struct phy *phy;
struct gpio_desc *gpio_reset;
struct gpio_desc *gpio_cs;
u8 vendor_specific2;
};
static int tusb1210_power_on(struct phy *phy)
{
struct tusb1210 *tusb = phy_get_drvdata(phy);
gpiod_set_value_cansleep(tusb->gpio_reset, 1);
gpiod_set_value_cansleep(tusb->gpio_cs, 1);
/* Restore the optional eye diagram optimization value */
if (tusb->vendor_specific2)
ulpi_write(tusb->ulpi, TUSB1210_VENDOR_SPECIFIC2,
tusb->vendor_specific2);
return 0;
}
static int tusb1210_power_off(struct phy *phy)
{
struct tusb1210 *tusb = phy_get_drvdata(phy);
gpiod_set_value_cansleep(tusb->gpio_reset, 0);
gpiod_set_value_cansleep(tusb->gpio_cs, 0);
return 0;
}
static int tusb1210_set_mode(struct phy *phy, enum phy_mode mode, int submode)
{
struct tusb1210 *tusb = phy_get_drvdata(phy);
int ret;
ret = ulpi_read(tusb->ulpi, ULPI_OTG_CTRL);
if (ret < 0)
return ret;
switch (mode) {
case PHY_MODE_USB_HOST:
ret |= (ULPI_OTG_CTRL_DRVVBUS_EXT
| ULPI_OTG_CTRL_ID_PULLUP
| ULPI_OTG_CTRL_DP_PULLDOWN
| ULPI_OTG_CTRL_DM_PULLDOWN);
ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret);
ret |= ULPI_OTG_CTRL_DRVVBUS;
break;
case PHY_MODE_USB_DEVICE:
ret &= ~(ULPI_OTG_CTRL_DRVVBUS
| ULPI_OTG_CTRL_DP_PULLDOWN
| ULPI_OTG_CTRL_DM_PULLDOWN);
ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret);
ret &= ~ULPI_OTG_CTRL_DRVVBUS_EXT;
break;
default:
/* nothing */
return 0;
}
return ulpi_write(tusb->ulpi, ULPI_OTG_CTRL, ret);
}
static const struct phy_ops phy_ops = {
.power_on = tusb1210_power_on,
.power_off = tusb1210_power_off,
.set_mode = tusb1210_set_mode,
.owner = THIS_MODULE,
};
static int tusb1210_probe(struct ulpi *ulpi)
{
struct tusb1210 *tusb;
u8 val, reg;
tusb = devm_kzalloc(&ulpi->dev, sizeof(*tusb), GFP_KERNEL);
if (!tusb)
return -ENOMEM;
tusb->gpio_reset = devm_gpiod_get_optional(&ulpi->dev, "reset",
GPIOD_OUT_LOW);
if (IS_ERR(tusb->gpio_reset))
return PTR_ERR(tusb->gpio_reset);
gpiod_set_value_cansleep(tusb->gpio_reset, 1);
tusb->gpio_cs = devm_gpiod_get_optional(&ulpi->dev, "cs",
GPIOD_OUT_LOW);
if (IS_ERR(tusb->gpio_cs))
return PTR_ERR(tusb->gpio_cs);
gpiod_set_value_cansleep(tusb->gpio_cs, 1);
/*
* VENDOR_SPECIFIC2 register in TUSB1210 can be used for configuring eye
* diagram optimization and DP/DM swap.
*/
/* High speed output drive strength configuration */
device_property_read_u8(&ulpi->dev, "ihstx", &val);
reg = val << TUSB1210_VENDOR_SPECIFIC2_IHSTX_SHIFT;
/* High speed output impedance configuration */
device_property_read_u8(&ulpi->dev, "zhsdrv", &val);
reg |= val << TUSB1210_VENDOR_SPECIFIC2_ZHSDRV_SHIFT;
/* DP/DM swap control */
device_property_read_u8(&ulpi->dev, "datapolarity", &val);
reg |= val << TUSB1210_VENDOR_SPECIFIC2_DP_SHIFT;
if (reg) {
ulpi_write(ulpi, TUSB1210_VENDOR_SPECIFIC2, reg);
tusb->vendor_specific2 = reg;
}
tusb->phy = ulpi_phy_create(ulpi, &phy_ops);
if (IS_ERR(tusb->phy))
return PTR_ERR(tusb->phy);
tusb->ulpi = ulpi;
phy_set_drvdata(tusb->phy, tusb);
ulpi_set_drvdata(ulpi, tusb);
return 0;
}
static void tusb1210_remove(struct ulpi *ulpi)
{
struct tusb1210 *tusb = ulpi_get_drvdata(ulpi);
ulpi_phy_destroy(ulpi, tusb->phy);
}
#define TI_VENDOR_ID 0x0451
static const struct ulpi_device_id tusb1210_ulpi_id[] = {
{ TI_VENDOR_ID, 0x1507, }, /* TUSB1210 */
{ TI_VENDOR_ID, 0x1508, }, /* TUSB1211 */
{ },
};
MODULE_DEVICE_TABLE(ulpi, tusb1210_ulpi_id);
static struct ulpi_driver tusb1210_driver = {
.id_table = tusb1210_ulpi_id,
.probe = tusb1210_probe,
.remove = tusb1210_remove,
.driver = {
.name = "tusb1210",
.owner = THIS_MODULE,
},
};
module_ulpi_driver(tusb1210_driver);
MODULE_AUTHOR("Intel Corporation");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("TUSB1210 ULPI PHY driver");
|
