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
|
// SPDX-License-Identifier: GPL-2.0
/*
* cdns3-ti.c - TI specific Glue layer for Cadence USB Controller
*
* Copyright (C) 2019 Texas Instruments Incorporated - https://www.ti.com
*/
#include <linux/bits.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
#include <linux/property.h>
/* USB Wrapper register offsets */
#define USBSS_PID 0x0
#define USBSS_W1 0x4
#define USBSS_STATIC_CONFIG 0x8
#define USBSS_PHY_TEST 0xc
#define USBSS_DEBUG_CTRL 0x10
#define USBSS_DEBUG_INFO 0x14
#define USBSS_DEBUG_LINK_STATE 0x18
#define USBSS_DEVICE_CTRL 0x1c
/* Wrapper 1 register bits */
#define USBSS_W1_PWRUP_RST BIT(0)
#define USBSS_W1_OVERCURRENT_SEL BIT(8)
#define USBSS_W1_MODESTRAP_SEL BIT(9)
#define USBSS_W1_OVERCURRENT BIT(16)
#define USBSS_W1_MODESTRAP_MASK GENMASK(18, 17)
#define USBSS_W1_MODESTRAP_SHIFT 17
#define USBSS_W1_USB2_ONLY BIT(19)
/* Static config register bits */
#define USBSS1_STATIC_PLL_REF_SEL_MASK GENMASK(8, 5)
#define USBSS1_STATIC_PLL_REF_SEL_SHIFT 5
#define USBSS1_STATIC_LOOPBACK_MODE_MASK GENMASK(4, 3)
#define USBSS1_STATIC_LOOPBACK_MODE_SHIFT 3
#define USBSS1_STATIC_VBUS_SEL_MASK GENMASK(2, 1)
#define USBSS1_STATIC_VBUS_SEL_SHIFT 1
#define USBSS1_STATIC_LANE_REVERSE BIT(0)
/* Modestrap modes */
enum modestrap_mode { USBSS_MODESTRAP_MODE_NONE,
USBSS_MODESTRAP_MODE_HOST,
USBSS_MODESTRAP_MODE_PERIPHERAL};
struct cdns_ti {
struct device *dev;
void __iomem *usbss;
unsigned usb2_only:1;
unsigned vbus_divider:1;
struct clk *usb2_refclk;
struct clk *lpm_clk;
};
static const int cdns_ti_rate_table[] = { /* in KHZ */
9600,
10000,
12000,
19200,
20000,
24000,
25000,
26000,
38400,
40000,
58000,
50000,
52000,
};
static inline u32 cdns_ti_readl(struct cdns_ti *data, u32 offset)
{
return readl(data->usbss + offset);
}
static inline void cdns_ti_writel(struct cdns_ti *data, u32 offset, u32 value)
{
writel(value, data->usbss + offset);
}
static int cdns_ti_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *node = pdev->dev.of_node;
struct cdns_ti *data;
int error;
u32 reg;
int rate_code, i;
unsigned long rate;
data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
platform_set_drvdata(pdev, data);
data->dev = dev;
data->usbss = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(data->usbss)) {
dev_err(dev, "can't map IOMEM resource\n");
return PTR_ERR(data->usbss);
}
data->usb2_refclk = devm_clk_get(dev, "ref");
if (IS_ERR(data->usb2_refclk)) {
dev_err(dev, "can't get usb2_refclk\n");
return PTR_ERR(data->usb2_refclk);
}
data->lpm_clk = devm_clk_get(dev, "lpm");
if (IS_ERR(data->lpm_clk)) {
dev_err(dev, "can't get lpm_clk\n");
return PTR_ERR(data->lpm_clk);
}
rate = clk_get_rate(data->usb2_refclk);
rate /= 1000; /* To KHz */
for (i = 0; i < ARRAY_SIZE(cdns_ti_rate_table); i++) {
if (cdns_ti_rate_table[i] == rate)
break;
}
if (i == ARRAY_SIZE(cdns_ti_rate_table)) {
dev_err(dev, "unsupported usb2_refclk rate: %lu KHz\n", rate);
return -EINVAL;
}
rate_code = i;
pm_runtime_enable(dev);
error = pm_runtime_get_sync(dev);
if (error < 0) {
dev_err(dev, "pm_runtime_get_sync failed: %d\n", error);
goto err;
}
/* assert RESET */
reg = cdns_ti_readl(data, USBSS_W1);
reg &= ~USBSS_W1_PWRUP_RST;
cdns_ti_writel(data, USBSS_W1, reg);
/* set static config */
reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG);
reg &= ~USBSS1_STATIC_PLL_REF_SEL_MASK;
reg |= rate_code << USBSS1_STATIC_PLL_REF_SEL_SHIFT;
reg &= ~USBSS1_STATIC_VBUS_SEL_MASK;
data->vbus_divider = device_property_read_bool(dev, "ti,vbus-divider");
if (data->vbus_divider)
reg |= 1 << USBSS1_STATIC_VBUS_SEL_SHIFT;
cdns_ti_writel(data, USBSS_STATIC_CONFIG, reg);
reg = cdns_ti_readl(data, USBSS_STATIC_CONFIG);
/* set USB2_ONLY mode if requested */
reg = cdns_ti_readl(data, USBSS_W1);
data->usb2_only = device_property_read_bool(dev, "ti,usb2-only");
if (data->usb2_only)
reg |= USBSS_W1_USB2_ONLY;
/* set default modestrap */
reg |= USBSS_W1_MODESTRAP_SEL;
reg &= ~USBSS_W1_MODESTRAP_MASK;
reg |= USBSS_MODESTRAP_MODE_NONE << USBSS_W1_MODESTRAP_SHIFT;
cdns_ti_writel(data, USBSS_W1, reg);
/* de-assert RESET */
reg |= USBSS_W1_PWRUP_RST;
cdns_ti_writel(data, USBSS_W1, reg);
error = of_platform_populate(node, NULL, NULL, dev);
if (error) {
dev_err(dev, "failed to create children: %d\n", error);
goto err;
}
return 0;
err:
pm_runtime_put_sync(data->dev);
pm_runtime_disable(data->dev);
return error;
}
static int cdns_ti_remove_core(struct device *dev, void *c)
{
struct platform_device *pdev = to_platform_device(dev);
platform_device_unregister(pdev);
return 0;
}
static void cdns_ti_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
device_for_each_child(dev, NULL, cdns_ti_remove_core);
pm_runtime_put_sync(dev);
pm_runtime_disable(dev);
platform_set_drvdata(pdev, NULL);
}
static const struct of_device_id cdns_ti_of_match[] = {
{ .compatible = "ti,j721e-usb", },
{ .compatible = "ti,am64-usb", },
{},
};
MODULE_DEVICE_TABLE(of, cdns_ti_of_match);
static struct platform_driver cdns_ti_driver = {
.probe = cdns_ti_probe,
.remove_new = cdns_ti_remove,
.driver = {
.name = "cdns3-ti",
.of_match_table = cdns_ti_of_match,
},
};
module_platform_driver(cdns_ti_driver);
MODULE_ALIAS("platform:cdns3-ti");
MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Cadence USB3 TI Glue Layer");
|
