1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2016 Linaro Ltd
4 */
5#include <linux/module.h>
6#include <linux/ulpi/driver.h>
7#include <linux/ulpi/regs.h>
8#include <linux/phy/phy.h>
9#include <linux/pinctrl/consumer.h>
10#include <linux/pinctrl/pinctrl-state.h>
11#include <linux/delay.h>
12#include <linux/clk.h>
13
14#define ULPI_HSIC_CFG		0x30
15#define ULPI_HSIC_IO_CAL	0x33
16
17struct qcom_usb_hsic_phy {
18	struct ulpi *ulpi;
19	struct phy *phy;
20	struct pinctrl *pctl;
21	struct clk *phy_clk;
22	struct clk *cal_clk;
23	struct clk *cal_sleep_clk;
24};
25
26static int qcom_usb_hsic_phy_power_on(struct phy *phy)
27{
28	struct qcom_usb_hsic_phy *uphy = phy_get_drvdata(phy);
29	struct ulpi *ulpi = uphy->ulpi;
30	struct pinctrl_state *pins_default;
31	int ret;
32
33	ret = clk_prepare_enable(uphy->phy_clk);
34	if (ret)
35		return ret;
36
37	ret = clk_prepare_enable(uphy->cal_clk);
38	if (ret)
39		goto err_cal;
40
41	ret = clk_prepare_enable(uphy->cal_sleep_clk);
42	if (ret)
43		goto err_sleep;
44
45	/* Set periodic calibration interval to ~2.048sec in HSIC_IO_CAL_REG */
46	ret = ulpi_write(ulpi, ULPI_HSIC_IO_CAL, 0xff);
47	if (ret)
48		goto err_ulpi;
49
50	/* Enable periodic IO calibration in HSIC_CFG register */
51	ret = ulpi_write(ulpi, ULPI_HSIC_CFG, 0xa8);
52	if (ret)
53		goto err_ulpi;
54
55	/* Configure pins for HSIC functionality */
56	pins_default = pinctrl_lookup_state(uphy->pctl, PINCTRL_STATE_DEFAULT);
57	if (IS_ERR(pins_default)) {
58		ret = PTR_ERR(pins_default);
59		goto err_ulpi;
60	}
61
62	ret = pinctrl_select_state(uphy->pctl, pins_default);
63	if (ret)
64		goto err_ulpi;
65
66	 /* Enable HSIC mode in HSIC_CFG register */
67	ret = ulpi_write(ulpi, ULPI_SET(ULPI_HSIC_CFG), 0x01);
68	if (ret)
69		goto err_ulpi;
70
71	/* Disable auto-resume */
72	ret = ulpi_write(ulpi, ULPI_CLR(ULPI_IFC_CTRL),
73			 ULPI_IFC_CTRL_AUTORESUME);
74	if (ret)
75		goto err_ulpi;
76
77	return ret;
78err_ulpi:
79	clk_disable_unprepare(uphy->cal_sleep_clk);
80err_sleep:
81	clk_disable_unprepare(uphy->cal_clk);
82err_cal:
83	clk_disable_unprepare(uphy->phy_clk);
84	return ret;
85}
86
87static int qcom_usb_hsic_phy_power_off(struct phy *phy)
88{
89	struct qcom_usb_hsic_phy *uphy = phy_get_drvdata(phy);
90
91	clk_disable_unprepare(uphy->cal_sleep_clk);
92	clk_disable_unprepare(uphy->cal_clk);
93	clk_disable_unprepare(uphy->phy_clk);
94
95	return 0;
96}
97
98static const struct phy_ops qcom_usb_hsic_phy_ops = {
99	.power_on = qcom_usb_hsic_phy_power_on,
100	.power_off = qcom_usb_hsic_phy_power_off,
101	.owner = THIS_MODULE,
102};
103
104static int qcom_usb_hsic_phy_probe(struct ulpi *ulpi)
105{
106	struct qcom_usb_hsic_phy *uphy;
107	struct phy_provider *p;
108	struct clk *clk;
109
110	uphy = devm_kzalloc(&ulpi->dev, sizeof(*uphy), GFP_KERNEL);
111	if (!uphy)
112		return -ENOMEM;
113	ulpi_set_drvdata(ulpi, uphy);
114
115	uphy->ulpi = ulpi;
116	uphy->pctl = devm_pinctrl_get(&ulpi->dev);
117	if (IS_ERR(uphy->pctl))
118		return PTR_ERR(uphy->pctl);
119
120	uphy->phy_clk = clk = devm_clk_get(&ulpi->dev, "phy");
121	if (IS_ERR(clk))
122		return PTR_ERR(clk);
123
124	uphy->cal_clk = clk = devm_clk_get(&ulpi->dev, "cal");
125	if (IS_ERR(clk))
126		return PTR_ERR(clk);
127
128	uphy->cal_sleep_clk = clk = devm_clk_get(&ulpi->dev, "cal_sleep");
129	if (IS_ERR(clk))
130		return PTR_ERR(clk);
131
132	uphy->phy = devm_phy_create(&ulpi->dev, ulpi->dev.of_node,
133				    &qcom_usb_hsic_phy_ops);
134	if (IS_ERR(uphy->phy))
135		return PTR_ERR(uphy->phy);
136	phy_set_drvdata(uphy->phy, uphy);
137
138	p = devm_of_phy_provider_register(&ulpi->dev, of_phy_simple_xlate);
139	return PTR_ERR_OR_ZERO(p);
140}
141
142static const struct of_device_id qcom_usb_hsic_phy_match[] = {
143	{ .compatible = "qcom,usb-hsic-phy", },
144	{ }
145};
146MODULE_DEVICE_TABLE(of, qcom_usb_hsic_phy_match);
147
148static struct ulpi_driver qcom_usb_hsic_phy_driver = {
149	.probe = qcom_usb_hsic_phy_probe,
150	.driver = {
151		.name = "qcom_usb_hsic_phy",
152		.of_match_table = qcom_usb_hsic_phy_match,
153	},
154};
155module_ulpi_driver(qcom_usb_hsic_phy_driver);
156
157MODULE_DESCRIPTION("Qualcomm USB HSIC phy");
158MODULE_LICENSE("GPL v2");
159