2 * Copyright (C) 2016 Linaro Ltd
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
8 #include <linux/module.h>
9 #include <linux/ulpi/driver.h>
10 #include <linux/ulpi/regs.h>
11 #include <linux/phy/phy.h>
12 #include <linux/pinctrl/consumer.h>
13 #include <linux/pinctrl/pinctrl-state.h>
14 #include <linux/delay.h>
15 #include <linux/clk.h>
17 #define ULPI_HSIC_CFG 0x30
18 #define ULPI_HSIC_IO_CAL 0x33
20 struct qcom_usb_hsic_phy {
26 struct clk *cal_sleep_clk;
29 static int qcom_usb_hsic_phy_power_on(struct phy *phy)
31 struct qcom_usb_hsic_phy *uphy = phy_get_drvdata(phy);
32 struct ulpi *ulpi = uphy->ulpi;
33 struct pinctrl_state *pins_default;
36 ret = clk_prepare_enable(uphy->phy_clk);
40 ret = clk_prepare_enable(uphy->cal_clk);
44 ret = clk_prepare_enable(uphy->cal_sleep_clk);
48 /* Set periodic calibration interval to ~2.048sec in HSIC_IO_CAL_REG */
49 ret = ulpi_write(ulpi, ULPI_HSIC_IO_CAL, 0xff);
53 /* Enable periodic IO calibration in HSIC_CFG register */
54 ret = ulpi_write(ulpi, ULPI_HSIC_CFG, 0xa8);
58 /* Configure pins for HSIC functionality */
59 pins_default = pinctrl_lookup_state(uphy->pctl, PINCTRL_STATE_DEFAULT);
60 if (IS_ERR(pins_default)) {
61 ret = PTR_ERR(pins_default);
65 ret = pinctrl_select_state(uphy->pctl, pins_default);
69 /* Enable HSIC mode in HSIC_CFG register */
70 ret = ulpi_write(ulpi, ULPI_SET(ULPI_HSIC_CFG), 0x01);
74 /* Disable auto-resume */
75 ret = ulpi_write(ulpi, ULPI_CLR(ULPI_IFC_CTRL),
76 ULPI_IFC_CTRL_AUTORESUME);
82 clk_disable_unprepare(uphy->cal_sleep_clk);
84 clk_disable_unprepare(uphy->cal_clk);
86 clk_disable_unprepare(uphy->phy_clk);
90 static int qcom_usb_hsic_phy_power_off(struct phy *phy)
92 struct qcom_usb_hsic_phy *uphy = phy_get_drvdata(phy);
94 clk_disable_unprepare(uphy->cal_sleep_clk);
95 clk_disable_unprepare(uphy->cal_clk);
96 clk_disable_unprepare(uphy->phy_clk);
101 static const struct phy_ops qcom_usb_hsic_phy_ops = {
102 .power_on = qcom_usb_hsic_phy_power_on,
103 .power_off = qcom_usb_hsic_phy_power_off,
104 .owner = THIS_MODULE,
107 static int qcom_usb_hsic_phy_probe(struct ulpi *ulpi)
109 struct qcom_usb_hsic_phy *uphy;
110 struct phy_provider *p;
113 uphy = devm_kzalloc(&ulpi->dev, sizeof(*uphy), GFP_KERNEL);
116 ulpi_set_drvdata(ulpi, uphy);
119 uphy->pctl = devm_pinctrl_get(&ulpi->dev);
120 if (IS_ERR(uphy->pctl))
121 return PTR_ERR(uphy->pctl);
123 uphy->phy_clk = clk = devm_clk_get(&ulpi->dev, "phy");
127 uphy->cal_clk = clk = devm_clk_get(&ulpi->dev, "cal");
131 uphy->cal_sleep_clk = clk = devm_clk_get(&ulpi->dev, "cal_sleep");
135 uphy->phy = devm_phy_create(&ulpi->dev, ulpi->dev.of_node,
136 &qcom_usb_hsic_phy_ops);
137 if (IS_ERR(uphy->phy))
138 return PTR_ERR(uphy->phy);
139 phy_set_drvdata(uphy->phy, uphy);
141 p = devm_of_phy_provider_register(&ulpi->dev, of_phy_simple_xlate);
142 return PTR_ERR_OR_ZERO(p);
145 static const struct of_device_id qcom_usb_hsic_phy_match[] = {
146 { .compatible = "qcom,usb-hsic-phy", },
149 MODULE_DEVICE_TABLE(of, qcom_usb_hsic_phy_match);
151 static struct ulpi_driver qcom_usb_hsic_phy_driver = {
152 .probe = qcom_usb_hsic_phy_probe,
154 .name = "qcom_usb_hsic_phy",
155 .of_match_table = qcom_usb_hsic_phy_match,
158 module_ulpi_driver(qcom_usb_hsic_phy_driver);
160 MODULE_DESCRIPTION("Qualcomm USB HSIC phy");
161 MODULE_LICENSE("GPL v2");