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
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
|
/*
* Copyright (c) 2015, Linaro Limited
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* 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. See the
* GNU General Public License for more details.
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/extcon.h>
#include <linux/gpio/consumer.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/usb/ulpi.h>
#define HSPHY_AHBBURST 0x0090
#define HSPHY_AHBMODE 0x0098
#define HSPHY_GENCONFIG 0x009c
#define HSPHY_GENCONFIG_2 0x00a0
#define HSPHY_USBCMD 0x0140
#define HSPHY_ULPI_VIEWPORT 0x0170
#define HSPHY_CTRL 0x0240
#define HSPHY_TXFIFO_IDLE_FORCE_DIS BIT(4)
#define HSPHY_SESS_VLD_CTRL_EN BIT(7)
#define HSPHY_POR_ASSERT BIT(0)
#define HSPHY_RETEN BIT(1)
#define HSPHY_SESS_VLD_CTRL BIT(25)
#define ULPI_PWR_CLK_MNG_REG 0x88
#define ULPI_PWR_OTG_COMP_DISABLE BIT(0)
#define ULPI_MISC_A 0x96
#define ULPI_MISC_A_VBUSVLDEXTSEL BIT(1)
#define ULPI_MISC_A_VBUSVLDEXT BIT(0)
#define HSPHY_3P3_MIN 3050000 /* uV */
#define HSPHY_3P3_MAX 3300000 /* uV */
#define HSPHY_1P8_MIN 1800000 /* uV */
#define HSPHY_1P8_MAX 1800000 /* uV */
#define HSPHY_VDD_MIN 5
#define HSPHY_VDD_MAX 7
struct phy_8x16 {
struct usb_phy phy;
void __iomem *regs;
struct clk *core_clk;
struct clk *iface_clk;
struct regulator_bulk_data regulator[3];
struct reset_control *phy_reset;
struct gpio_desc *switch_gpio;
struct notifier_block reboot_notify;
};
static int phy_8x16_notify_connect(struct usb_phy *phy,
enum usb_device_speed speed)
{
struct phy_8x16 *qphy = container_of(phy, struct phy_8x16, phy);
u32 val;
val = ULPI_MISC_A_VBUSVLDEXTSEL | ULPI_MISC_A_VBUSVLDEXT;
usb_phy_io_write(&qphy->phy, val, ULPI_SET(ULPI_MISC_A));
val = readl(qphy->regs + HSPHY_USBCMD);
val |= HSPHY_SESS_VLD_CTRL;
writel(val, qphy->regs + HSPHY_USBCMD);
return 0;
}
static int phy_8x16_notify_disconnect(struct usb_phy *phy,
enum usb_device_speed speed)
{
struct phy_8x16 *qphy = container_of(phy, struct phy_8x16, phy);
u32 val;
val = ULPI_MISC_A_VBUSVLDEXT | ULPI_MISC_A_VBUSVLDEXTSEL;
usb_phy_io_write(&qphy->phy, val, ULPI_CLR(ULPI_MISC_A));
val = readl(qphy->regs + HSPHY_USBCMD);
val &= ~HSPHY_SESS_VLD_CTRL;
writel(val, qphy->regs + HSPHY_USBCMD);
return 0;
}
static int phy_8x16_vbus_on(struct phy_8x16 *qphy)
{
phy_8x16_notify_connect(&qphy->phy, USB_SPEED_UNKNOWN);
/* Switch D+/D- lines to Device connector */
gpiod_set_value_cansleep(qphy->switch_gpio, 0);
return 0;
}
static int phy_8x16_vbus_off(struct phy_8x16 *qphy)
{
phy_8x16_notify_disconnect(&qphy->phy, USB_SPEED_UNKNOWN);
/* Switch D+/D- lines to USB HUB */
gpiod_set_value_cansleep(qphy->switch_gpio, 1);
return 0;
}
static int phy_8x16_vbus_notify(struct notifier_block *nb, unsigned long event,
void *ptr)
{
struct usb_phy *usb_phy = container_of(nb, struct usb_phy, vbus_nb);
struct phy_8x16 *qphy = container_of(usb_phy, struct phy_8x16, phy);
if (event)
phy_8x16_vbus_on(qphy);
else
phy_8x16_vbus_off(qphy);
return NOTIFY_DONE;
}
static int phy_8x16_init(struct usb_phy *phy)
{
struct phy_8x16 *qphy = container_of(phy, struct phy_8x16, phy);
u32 val, init[] = {0x44, 0x6B, 0x24, 0x13};
u32 addr = ULPI_EXT_VENDOR_SPECIFIC;
int idx, state;
for (idx = 0; idx < ARRAY_SIZE(init); idx++)
usb_phy_io_write(phy, init[idx], addr + idx);
reset_control_reset(qphy->phy_reset);
/* Assert USB HSPHY_POR */
val = readl(qphy->regs + HSPHY_CTRL);
val |= HSPHY_POR_ASSERT;
writel(val, qphy->regs + HSPHY_CTRL);
/*
* wait for minimum 10 microseconds as suggested in HPG.
* Use a slightly larger value since the exact value didn't
* work 100% of the time.
*/
usleep_range(12, 15);
/* Deassert USB HSPHY_POR */
val = readl(qphy->regs + HSPHY_CTRL);
val &= ~HSPHY_POR_ASSERT;
writel(val, qphy->regs + HSPHY_CTRL);
usleep_range(10, 15);
writel(0x00, qphy->regs + HSPHY_AHBBURST);
writel(0x08, qphy->regs + HSPHY_AHBMODE);
/* workaround for rx buffer collision issue */
val = readl(qphy->regs + HSPHY_GENCONFIG);
val &= ~HSPHY_TXFIFO_IDLE_FORCE_DIS;
writel(val, qphy->regs + HSPHY_GENCONFIG);
val = readl(qphy->regs + HSPHY_GENCONFIG_2);
val |= HSPHY_SESS_VLD_CTRL_EN;
writel(val, qphy->regs + HSPHY_GENCONFIG_2);
val = ULPI_PWR_OTG_COMP_DISABLE;
usb_phy_io_write(phy, val, ULPI_SET(ULPI_PWR_CLK_MNG_REG));
state = extcon_get_state(qphy->phy.edev, EXTCON_USB);
if (state)
phy_8x16_vbus_on(qphy);
else
phy_8x16_vbus_off(qphy);
val = usb_phy_io_read(&qphy->phy, ULPI_FUNC_CTRL);
val &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
val |= ULPI_FUNC_CTRL_OPMODE_NORMAL;
usb_phy_io_write(&qphy->phy, val, ULPI_FUNC_CTRL);
return 0;
}
static void phy_8x16_shutdown(struct usb_phy *phy)
{
u32 val;
/* Put the controller in non-driving mode */
val = usb_phy_io_read(phy, ULPI_FUNC_CTRL);
val &= ~ULPI_FUNC_CTRL_OPMODE_MASK;
val |= ULPI_FUNC_CTRL_OPMODE_NONDRIVING;
usb_phy_io_write(phy, val, ULPI_FUNC_CTRL);
}
static int phy_8x16_read_devicetree(struct phy_8x16 *qphy)
{
struct device *dev = qphy->phy.dev;
int ret;
qphy->core_clk = devm_clk_get(dev, "core");
if (IS_ERR(qphy->core_clk))
return PTR_ERR(qphy->core_clk);
qphy->iface_clk = devm_clk_get(dev, "iface");
if (IS_ERR(qphy->iface_clk))
return PTR_ERR(qphy->iface_clk);
qphy->regulator[0].supply = "v3p3";
qphy->regulator[1].supply = "v1p8";
qphy->regulator[2].supply = "vddcx";
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(qphy->regulator),
qphy->regulator);
if (ret)
return ret;
qphy->phy_reset = devm_reset_control_get(dev, "phy");
if (IS_ERR(qphy->phy_reset))
return PTR_ERR(qphy->phy_reset);
qphy->switch_gpio = devm_gpiod_get_optional(dev, "switch",
GPIOD_OUT_LOW);
return PTR_ERR_OR_ZERO(qphy->switch_gpio);
}
static int phy_8x16_reboot_notify(struct notifier_block *this,
unsigned long code, void *unused)
{
struct phy_8x16 *qphy;
qphy = container_of(this, struct phy_8x16, reboot_notify);
/*
* Ensure that D+/D- lines are routed to uB connector, so
* we could load bootloader/kernel at next reboot_notify
*/
gpiod_set_value_cansleep(qphy->switch_gpio, 0);
return NOTIFY_DONE;
}
static int phy_8x16_probe(struct platform_device *pdev)
{
struct phy_8x16 *qphy;
struct resource *res;
struct usb_phy *phy;
int ret;
qphy = devm_kzalloc(&pdev->dev, sizeof(*qphy), GFP_KERNEL);
if (!qphy)
return -ENOMEM;
platform_set_drvdata(pdev, qphy);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
qphy->regs = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(qphy->regs))
return PTR_ERR(qphy->regs);
phy = &qphy->phy;
phy->dev = &pdev->dev;
phy->label = dev_name(&pdev->dev);
phy->init = phy_8x16_init;
phy->shutdown = phy_8x16_shutdown;
phy->notify_connect = phy_8x16_notify_connect;
phy->notify_disconnect = phy_8x16_notify_disconnect;
phy->io_priv = <
|