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
17 struct 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
qcom_usb_hsic_phy_power_on(struct phy * phy)26 static 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;
78 err_ulpi:
79 clk_disable_unprepare(uphy->cal_sleep_clk);
80 err_sleep:
81 clk_disable_unprepare(uphy->cal_clk);
82 err_cal:
83 clk_disable_unprepare(uphy->phy_clk);
84 return ret;
85 }
86
qcom_usb_hsic_phy_power_off(struct phy * phy)87 static 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
98 static 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
qcom_usb_hsic_phy_probe(struct ulpi * ulpi)104 static 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
142 static const struct of_device_id qcom_usb_hsic_phy_match[] = {
143 { .compatible = "qcom,usb-hsic-phy", },
144 { }
145 };
146 MODULE_DEVICE_TABLE(of, qcom_usb_hsic_phy_match);
147
148 static 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 };
155 module_ulpi_driver(qcom_usb_hsic_phy_driver);
156
157 MODULE_DESCRIPTION("Qualcomm USB HSIC phy");
158 MODULE_LICENSE("GPL v2");
159