tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/**
2 * Copyright (C) 2016 Linaro Ltd
3 *
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.
7 */
8#include <linux/module.h>
9#include <linux/ulpi/driver.h>
10#include <linux/ulpi/regs.h>
11#include <linux/pinctrl/consumer.h>
12#include <linux/pinctrl/pinctrl-state.h>
13#include <linux/delay.h>
14#include <linux/clk.h>
15
16#include "ulpi_phy.h"
17
18#define ULPI_HSIC_CFG 0x30
19#define ULPI_HSIC_IO_CAL 0x33
20
21struct qcom_usb_hsic_phy {
22 struct ulpi *ulpi;
23 struct phy *phy;
24 struct pinctrl *pctl;
25 struct clk *phy_clk;
26 struct clk *cal_clk;
27 struct clk *cal_sleep_clk;
28};
29
30static int qcom_usb_hsic_phy_power_on(struct phy *phy)
31{
32 struct qcom_usb_hsic_phy *uphy = phy_get_drvdata(phy);
33 struct ulpi *ulpi = uphy->ulpi;
34 struct pinctrl_state *pins_default;
35 int ret;
36
37 ret = clk_prepare_enable(uphy->phy_clk);
38 if (ret)
39 return ret;
40
41 ret = clk_prepare_enable(uphy->cal_clk);
42 if (ret)
43 goto err_cal;
44
45 ret = clk_prepare_enable(uphy->cal_sleep_clk);
46 if (ret)
47 goto err_sleep;
48
49 /* Set periodic calibration interval to ~2.048sec in HSIC_IO_CAL_REG */
50 ret = ulpi_write(ulpi, ULPI_HSIC_IO_CAL, 0xff);
51 if (ret)
52 goto err_ulpi;
53
54 /* Enable periodic IO calibration in HSIC_CFG register */
55 ret = ulpi_write(ulpi, ULPI_HSIC_CFG, 0xa8);
56 if (ret)
57 goto err_ulpi;
58
59 /* Configure pins for HSIC functionality */
60 pins_default = pinctrl_lookup_state(uphy->pctl, PINCTRL_STATE_DEFAULT);
61 if (IS_ERR(pins_default))
62 return PTR_ERR(pins_default);
63
64 ret = pinctrl_select_state(uphy->pctl, pins_default);
65 if (ret)
66 goto err_ulpi;
67
68 /* Enable HSIC mode in HSIC_CFG register */
69 ret = ulpi_write(ulpi, ULPI_SET(ULPI_HSIC_CFG), 0x01);
70 if (ret)
71 goto err_ulpi;
72
73 /* Disable auto-resume */
74 ret = ulpi_write(ulpi, ULPI_CLR(ULPI_IFC_CTRL),
75 ULPI_IFC_CTRL_AUTORESUME);
76 if (ret)
77 goto err_ulpi;
78
79 return ret;
80err_ulpi:
81 clk_disable_unprepare(uphy->cal_sleep_clk);
82err_sleep:
83 clk_disable_unprepare(uphy->cal_clk);
84err_cal:
85 clk_disable_unprepare(uphy->phy_clk);
86 return ret;
87}
88
89static int qcom_usb_hsic_phy_power_off(struct phy *phy)
90{
91 struct qcom_usb_hsic_phy *uphy = phy_get_drvdata(phy);
92
93 clk_disable_unprepare(uphy->cal_sleep_clk);
94 clk_disable_unprepare(uphy->cal_clk);
95 clk_disable_unprepare(uphy->phy_clk);
96
97 return 0;
98}
99
100static const struct phy_ops qcom_usb_hsic_phy_ops = {
101 .power_on = qcom_usb_hsic_phy_power_on,
102 .power_off = qcom_usb_hsic_phy_power_off,
103 .owner = THIS_MODULE,
104};
105
106static int qcom_usb_hsic_phy_probe(struct ulpi *ulpi)
107{
108 struct qcom_usb_hsic_phy *uphy;
109 struct phy_provider *p;
110 struct clk *clk;
111
112 uphy = devm_kzalloc(&ulpi->dev, sizeof(*uphy), GFP_KERNEL);
113 if (!uphy)
114 return -ENOMEM;
115 ulpi_set_drvdata(ulpi, uphy);
116
117 uphy->ulpi = ulpi;
118 uphy->pctl = devm_pinctrl_get(&ulpi->dev);
119 if (IS_ERR(uphy->pctl))
120 return PTR_ERR(uphy->pctl);
121
122 uphy->phy_clk = clk = devm_clk_get(&ulpi->dev, "phy");
123 if (IS_ERR(clk))
124 return PTR_ERR(clk);
125
126 uphy->cal_clk = clk = devm_clk_get(&ulpi->dev, "cal");
127 if (IS_ERR(clk))
128 return PTR_ERR(clk);
129
130 uphy->cal_sleep_clk = clk = devm_clk_get(&ulpi->dev, "cal_sleep");
131 if (IS_ERR(clk))
132 return PTR_ERR(clk);
133
134 uphy->phy = devm_phy_create(&ulpi->dev, ulpi->dev.of_node,
135 &qcom_usb_hsic_phy_ops);
136 if (IS_ERR(uphy->phy))
137 return PTR_ERR(uphy->phy);
138 phy_set_drvdata(uphy->phy, uphy);
139
140 p = devm_of_phy_provider_register(&ulpi->dev, of_phy_simple_xlate);
141 return PTR_ERR_OR_ZERO(p);
142}
143
144static const struct of_device_id qcom_usb_hsic_phy_match[] = {
145 { .compatible = "qcom,usb-hsic-phy", },
146 { }
147};
148MODULE_DEVICE_TABLE(of, qcom_usb_hsic_phy_match);
149
150static struct ulpi_driver qcom_usb_hsic_phy_driver = {
151 .probe = qcom_usb_hsic_phy_probe,
152 .driver = {
153 .name = "qcom_usb_hsic_phy",
154 .of_match_table = qcom_usb_hsic_phy_match,
155 },
156};
157module_ulpi_driver(qcom_usb_hsic_phy_driver);
158
159MODULE_DESCRIPTION("Qualcomm USB HSIC phy");
160MODULE_LICENSE("GPL v2");