summaryrefslogtreecommitdiff
path: root/drivers/phy/qualcomm/phy-qcom-usb-hs.c
blob: 5c6c17673396175493c0a1f2c19b409b6136c2b8 (plain)
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
// SPDX-License-Identifier: GPL-2.0-only
/**
 * Copyright (C) 2016 Linaro Ltd
 */
#include <linux/module.h>
#include <linux/ulpi/driver.h>
#include <linux/ulpi/regs.h>
#include <linux/clk.h>
#include <linux/regulator/consumer.h>
#include <linux/of_device.h>
#include <linux/phy/phy.h>
#include <linux/reset.h>
#include <linux/extcon.h>
#include <linux/notifier.h>

#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)


struct ulpi_seq {
	u8 addr;
	u8 val;
};

struct qcom_usb_hs_phy {
	struct ulpi *ulpi;
	struct phy *phy;
	struct clk *ref_clk;
	struct clk *sleep_clk;
	struct regulator *v1p8;
	struct regulator *v3p3;
	struct reset_control *reset;
	struct ulpi_seq *init_seq;
	struct extcon_dev *vbus_edev;
	struct notifier_block vbus_notify;
};

static int qcom_usb_hs_phy_set_mode(struct phy *phy,
				    enum phy_mode mode, int submode)
{
	struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy);
	u8 addr;
	int ret;

	if (!uphy->vbus_edev) {
		u8 val = 0;

		switch (mode) {
		case PHY_MODE_USB_OTG:
		case PHY_MODE_USB_HOST:
			val |= ULPI_INT_IDGRD;
			fallthrough;
		case PHY_MODE_USB_DEVICE:
			val |= ULPI_INT_SESS_VALID;
			break;
		default:
			break;
		}

		ret = ulpi_write(uphy->ulpi, ULPI_USB_INT_EN_RISE, val);
		if (ret)
			return ret;
		ret = ulpi_write(uphy->ulpi, ULPI_USB_INT_EN_FALL, val);
	} else {
		switch (mode) {
		case PHY_MODE_USB_OTG:
		case PHY_MODE_USB_DEVICE:
			addr = ULPI_SET(ULPI_MISC_A);
			break;
		case PHY_MODE_USB_HOST:
			addr = ULPI_CLR(ULPI_MISC_A);
			break;
		default:
			return -EINVAL;
		}

		ret = ulpi_write(uphy->ulpi, ULPI_SET(ULPI_PWR_CLK_MNG_REG),
				 ULPI_PWR_OTG_COMP_DISABLE);
		if (ret)
			return ret;
		ret = ulpi_write(uphy->ulpi, addr, ULPI_MISC_A_VBUSVLDEXTSEL);
	}

	return ret;
}

static int
qcom_usb_hs_phy_vbus_notifier(struct notifier_block *nb, unsigned long event,
			      void *ptr)
{
	struct qcom_usb_hs_phy *uphy;
	u8 addr;

	uphy = container_of(nb, struct qcom_usb_hs_phy, vbus_notify);

	if (event)
		addr = ULPI_SET(ULPI_MISC_A);
	else
		addr = ULPI_CLR(ULPI_MISC_A);

	return ulpi_write(uphy->ulpi, addr, ULPI_MISC_A_VBUSVLDEXT);
}

static int qcom_usb_hs_phy_power_on(struct phy *phy)
{
	struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy);
	struct ulpi *ulpi = uphy->ulpi;
	const struct ulpi_seq *seq;
	int ret, state;

	ret = clk_prepare_enable(uphy->ref_clk);
	if (ret)
		return ret;

	ret = clk_prepare_enable(uphy->sleep_clk);
	if (ret)
		goto err_sleep;

	ret = regulator_set_load(uphy->v1p8, 50000);
	if (ret < 0)
		goto err_1p8;

	ret = regulator_enable(uphy->v1p8);
	if (ret)
		goto err_1p8;

	ret = regulator_set_voltage_triplet(uphy->v3p3, 3050000, 3300000,
					    3300000);
	if (ret)
		goto err_3p3;

	ret = regulator_set_load(uphy->v3p3, 50000);
	if (ret < 0)
		goto err_3p3;

	ret = regulator_enable(uphy->v3p3);
	if (ret)
		goto err_3p3;

	for (seq = uphy->init_seq; seq->addr; seq++) {
		ret = ulpi_write(ulpi, ULPI_EXT_VENDOR_SPECIFIC + seq->addr,
				 seq->val);
		if (ret)
			goto err_ulpi;
	}

	if (uphy->reset) {
		ret = reset_control_reset(uphy->reset);
		if (ret)
			goto err_ulpi;
	}

	if (uphy->vbus_edev) {
		state = extcon_get_state(uphy->vbus_edev, EXTCON_USB);
		/* setup initial state */
		qcom_usb_hs_phy_vbus_notifier(&uphy->vbus_notify, state,
					      uphy->vbus_edev);
		ret = extcon_register_notifier(uphy->vbus_edev, EXTCON_USB,
					       &uphy->vbus_notify);
		if (ret)
			goto err_ulpi;
	}

	return 0;
err_ulpi:
	regulator_disable(uphy->v3p3);
err_3p3:
	regulator_disable(uphy->v1p8);
err_1p8:
	clk_disable_unprepare(uphy->sleep_clk);
err_sleep:
	clk_disable_unprepare(uphy->ref_clk);
	return ret;
}

static int qcom_usb_hs_phy_power_off(struct phy *phy)
{
	struct qcom_usb_hs_phy *uphy = phy_get_drvdata(phy);

	if (uphy->vbus_edev)
		extcon_unregister_notifier(uphy->vbus_edev, EXTCON_USB,
					   &uphy->vbus_notify);
	regulator_disable(uphy->v3p3);
	regulator_disable(uphy->v1p8);
	clk_disable_unprepare(uphy->sleep_clk);
	clk_disable_unprepare(uphy->ref_clk);

	return 0;
}

static const struct phy_ops qcom_usb_hs_phy_ops = {
	.power_on = qcom_usb_hs_phy_power_on,
	.power_off = qcom_usb_hs_phy_power_off,
	.set_mode = qcom_usb_hs_phy_set_mode,
	.owner = THIS_MODULE,
};

static int qcom_usb_hs_phy_probe(struct ulpi *ulpi)
{
	struct qcom_usb_hs_phy *uphy;
	struct phy_provider *p;
	struct clk *clk;
	struct regulator *reg;
	struct reset_control *reset;
	int size;
	int ret;

	uphy = devm_kzalloc(&ulpi->dev, sizeof(*uphy), GFP_KERNEL);
	if (!uphy)
		return -ENOMEM;
	ulpi_set_drvdata(ulpi, uphy);
	uphy->ulpi = ulpi;

	size = of_property_count_u8_elems(ulpi->dev.of_node, "qcom,init-seq");
	if (size < 0)
		size = 0;
	uphy->init_seq = devm_kmalloc_array(&ulpi->dev, (size / 2) + 1,
					   sizeof(*uphy->init_seq), GFP_KERNEL);
	if (!uphy->init_seq)
		return -ENOMEM;
	ret = of_property_read_u8_array(ulpi->dev.of_node, "qcom,init-seq",
					(u8 *)uphy->init_seq, size);
	if (ret && size)
		return ret;
	/* NUL terminate */
	uphy->init_seq[size / 2].addr = uphy->init_seq[size / 2].val = 0;

	uphy->ref_clk = clk = devm_clk_get(&ulpi->dev, "ref");
	if (IS_ERR(clk))
		return PTR_ERR(clk);

	uphy->sleep_clk = clk = devm_clk_get(&ulpi->dev, "sleep");
	if (IS_ERR(clk))
		return PTR_ERR(clk);

	uphy->v1p8 = reg = devm_regulator_get(&ulpi->dev, "v1p8");
	if (IS_ERR(reg))
		return PTR_ERR(reg);

	uphy->v3p3 = reg = devm_regulator_get(&ulpi->dev, "v3p3");
	if (IS_ERR(reg))
		return PTR_ERR(reg);

	uphy->reset = reset = devm_reset_control_get(&ulpi->dev, "por");
	if (IS_ERR(reset)) {
		if (PTR_ERR(reset) == -EPROBE_DEFER)
			return PTR_ERR(reset);
		uphy->reset = NULL;
	}

	uphy->phy = devm_phy_create(&ulpi->dev, ulpi->dev.of_node,
				    &qcom_usb_hs_phy_ops);
	if (IS_ERR(uphy->phy))
		return PTR_ERR(uphy->phy);

	uphy->vbus_edev = extcon_get_edev_by_phandle(&ulpi->dev, 0);
	if (IS_ERR(uphy->vbus_edev)) {
		if (PTR_ERR(uphy->vbus_edev) != -ENODEV)
			return PTR_ERR(uphy->vbus_edev);
		uphy->vbus_edev = NULL;
	}

	uphy->vbus_notify.notifier_call = qcom_usb_hs_phy_vbus_notifier;
	phy_set_drvdata(uphy->phy, uphy);

	p = devm_of_phy_provider_register(&ulpi->dev, of_phy_simple_xlate);
	return PTR_ERR_OR_ZERO(p);
}

static const struct of_device_id qcom_usb_hs_phy_match[] = {
	{ .compatible = "qcom,usb-hs-phy", },
	{ }
};
MODULE_DEVICE_TABLE(of, qcom_usb_hs_phy_match);

static struct ulpi_driver qcom_usb_hs_phy_driver = {
	.probe = qcom_usb_hs_phy_probe,
	.driver = {
		.name = "qcom_usb_hs_phy",
		.of_match_table = qcom_usb_hs_phy_match,
	},
};
module_ulpi_driver(qcom_usb_hs_phy_driver);

MODULE_DESCRIPTION("Qualcomm USB HS phy");
MODULE_LICENSE("GPL v2");