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
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
|
/*
* STiH407 family DWC3 specific Glue layer
*
* Copyright (c) 2017
* Patrice Chotard <patrice.chotard@st.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/io.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <libfdt.h>
#include <dm/lists.h>
#include <regmap.h>
#include <reset-uclass.h>
#include <syscon.h>
#include <usb.h>
#include <linux/usb/dwc3.h>
#include <linux/usb/otg.h>
#include <dwc3-sti-glue.h>
DECLARE_GLOBAL_DATA_PTR;
/*
* struct sti_dwc3_glue_platdata - dwc3 STi glue driver private structure
* @syscfg_base: addr for the glue syscfg
* @glue_base: addr for the glue registers
* @syscfg_offset: usb syscfg control offset
* @powerdown_ctl: rest controller for powerdown signal
* @softreset_ctl: reset controller for softreset signal
* @mode: drd static host/device config
*/
struct sti_dwc3_glue_platdata {
phys_addr_t syscfg_base;
phys_addr_t glue_base;
phys_addr_t syscfg_offset;
struct reset_ctl powerdown_ctl;
struct reset_ctl softreset_ctl;
enum usb_dr_mode mode;
};
static int sti_dwc3_glue_drd_init(struct sti_dwc3_glue_platdata *plat)
{
unsigned long val;
val = readl(plat->syscfg_base + plat->syscfg_offset);
val &= USB3_CONTROL_MASK;
switch (plat->mode) {
case USB_DR_MODE_PERIPHERAL:
val &= ~(USB3_DELAY_VBUSVALID
| USB3_SEL_FORCE_OPMODE | USB3_FORCE_OPMODE(0x3)
| USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2
| USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2);
val |= USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID;
break;
case USB_DR_MODE_HOST:
val &= ~(USB3_DEVICE_NOT_HOST | USB3_FORCE_VBUSVALID
| USB3_SEL_FORCE_OPMODE | USB3_FORCE_OPMODE(0x3)
| USB3_SEL_FORCE_DPPULLDOWN2 | USB3_FORCE_DPPULLDOWN2
| USB3_SEL_FORCE_DMPULLDOWN2 | USB3_FORCE_DMPULLDOWN2);
val |= USB3_DELAY_VBUSVALID;
break;
default:
error("Unsupported mode of operation %d\n", plat->mode);
return -EINVAL;
}
writel(val, plat->syscfg_base + plat->syscfg_offset);
return 0;
}
static void sti_dwc3_glue_init(struct sti_dwc3_glue_platdata *plat)
{
unsigned long reg;
reg = readl(plat->glue_base + CLKRST_CTRL);
reg |= AUX_CLK_EN | EXT_CFG_RESET_N | XHCI_REVISION;
reg &= ~SW_PIPEW_RESET_N;
writel(reg, plat->glue_base + CLKRST_CTRL);
/* configure mux for vbus, powerpresent and bvalid signals */
reg = readl(plat->glue_base + USB2_VBUS_MNGMNT_SEL1);
reg |= SEL_OVERRIDE_VBUSVALID(USB2_VBUS_UTMIOTG) |
SEL_OVERRIDE_POWERPRESENT(USB2_VBUS_UTMIOTG) |
SEL_OVERRIDE_BVALID(USB2_VBUS_UTMIOTG);
writel(reg, plat->glue_base + USB2_VBUS_MNGMNT_SEL1);
setbits_le32(plat->glue_base + CLKRST_CTRL, SW_PIPEW_RESET_N);
}
static int sti_dwc3_glue_ofdata_to_platdata(struct udevice *dev)
{
struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
struct udevice *syscon;
struct regmap *regmap;
int ret;
u32 reg[4];
ret = fdtdec_get_int_array(gd->fdt_blob, dev_of_offset(dev),
"reg", reg, ARRAY_SIZE(reg));
if (ret) {
error("unable to find st,stih407-dwc3 reg property(%d)\n", ret);
return ret;
}
plat->glue_base = reg[0];
plat->syscfg_offset = reg[2];
/* get corresponding syscon phandle */
ret = uclass_get_device_by_phandle(UCLASS_SYSCON, dev, "st,syscfg",
&syscon);
if (ret) {
error("unable to find syscon device (%d)\n", ret);
return ret;
}
/* get syscfg-reg base address */
regmap = syscon_get_regmap(syscon);
if (!regmap) {
error("unable to find regmap\n");
return -ENODEV;
}
plat->syscfg_base = regmap->base;
/* get powerdown reset */
ret = reset_get_by_name(dev, "powerdown", &plat->powerdown_ctl);
if (ret) {
error("can't get powerdown reset for %s (%d)", dev->name, ret);
return ret;
}
/* get softreset reset */
ret = reset_get_by_name(dev, "softreset", &plat->softreset_ctl);
if (ret)
error("can't get soft reset for %s (%d)", dev->name, ret);
return ret;
};
static int sti_dwc3_glue_bind(struct udevice *dev)
{
struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
int dwc3_node;
/* check if one subnode is present */
dwc3_node = fdt_first_subnode(gd->fdt_blob, dev_of_offset(dev));
if (dwc3_node <= 0) {
error("Can't find subnode for %s\n", dev->name);
return -ENODEV;
}
/* check if the subnode compatible string is the dwc3 one*/
if (fdt_node_check_compatible(gd->fdt_blob, dwc3_node,
"snps,dwc3") != 0) {
error("Can't find dwc3 subnode for %s\n", dev->name);
return -ENODEV;
}
/* retrieve the DWC3 dual role mode */
plat->mode = usb_get_dr_mode(dwc3_node);
if (plat->mode == USB_DR_MODE_UNKNOWN)
/* by default set dual role mode to HOST */
plat->mode = USB_DR_MODE_HOST;
return dm_scan_fdt_dev(dev);
}
static int sti_dwc3_glue_probe(struct udevice *dev)
{
struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
int ret;
/* deassert both powerdown and softreset */
ret = reset_deassert(&plat->powerdown_ctl);
if (ret < 0) {
error("DWC3 powerdown reset deassert failed: %d", ret);
return ret;
}
ret = reset_deassert(&plat->softreset_ctl);
if (ret < 0) {
error("DWC3 soft reset deassert failed: %d", ret);
goto softreset_err;
}
ret = sti_dwc3_glue_drd_init(plat);
if (ret)
goto init_err;
sti_dwc3_glue_init(plat);
return 0;
init_err:
ret = reset_assert(&plat->softreset_ctl);
if (ret < 0) {
error("DWC3 soft reset deassert failed: %d", ret);
return ret;
}
softreset_err:
ret = reset_assert(&plat->powerdown_ctl);
if (ret < 0)
error("DWC3 powerdown reset deassert failed: %d", ret);
return ret;
}
static int sti_dwc3_glue_remove(struct udevice *dev)
{
struct sti_dwc3_glue_platdata *plat = dev_get_platdata(dev);
int ret;
/* assert both powerdown and softreset */
ret = reset_assert(&plat->powerdown_ctl);
if (ret < 0) {
error("DWC3 powerdown reset deassert failed: %d", ret);
return ret;
}
ret = reset_assert(&plat->softreset_ctl);
if (ret < 0)
error("DWC3 soft reset deassert failed: %d", ret);
return ret;
}
static const struct udevice_id sti_dwc3_glue_ids[] = {
{ .compatible = "st,stih407-dwc3" },
{ }
};
U_BOOT_DRIVER(dwc3_sti_glue) = {
.name = "dwc3_sti_glue",
.id = UCLASS_MISC,
.of_match = sti_dwc3_glue_ids,
.ofdata_to_platdata = sti_dwc3_glue_ofdata_to_platdata,
.probe = sti_dwc3_glue_probe,
.remove = sti_dwc3_glue_remove,
.bind = sti_dwc3_glue_bind,
.platdata_auto_alloc_size = sizeof(struct sti_dwc3_glue_platdata),
.flags = DM_FLAG_ALLOC_PRIV_DMA,
};
|
