1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Allwinner sun9i USB phy driver
4 *
5 * Copyright (C) 2014-2015 Chen-Yu Tsai <wens@csie.org>
6 *
7 * Based on phy-sun4i-usb.c from
8 * Hans de Goede <hdegoede@redhat.com>
9 *
10 * and code from
11 * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
12 */
13
14#include <linux/clk.h>
15#include <linux/err.h>
16#include <linux/io.h>
17#include <linux/module.h>
18#include <linux/phy/phy.h>
19#include <linux/usb/of.h>
20#include <linux/platform_device.h>
21#include <linux/reset.h>
22
23#define SUNXI_AHB_INCR16_BURST_EN	BIT(11)
24#define SUNXI_AHB_INCR8_BURST_EN	BIT(10)
25#define SUNXI_AHB_INCR4_BURST_EN	BIT(9)
26#define SUNXI_AHB_INCRX_ALIGN_EN	BIT(8)
27#define SUNXI_ULPI_BYPASS_EN		BIT(0)
28
29/* usb1 HSIC specific bits */
30#define SUNXI_EHCI_HS_FORCE		BIT(20)
31#define SUNXI_HSIC_CONNECT_DET		BIT(17)
32#define SUNXI_HSIC_CONNECT_INT		BIT(16)
33#define SUNXI_HSIC			BIT(1)
34
35struct sun9i_usb_phy {
36	struct phy *phy;
37	void __iomem *pmu;
38	struct reset_control *reset;
39	struct clk *clk;
40	struct clk *hsic_clk;
41	enum usb_phy_interface type;
42};
43
44static void sun9i_usb_phy_passby(struct sun9i_usb_phy *phy, int enable)
45{
46	u32 bits, reg_value;
47
48	bits = SUNXI_AHB_INCR16_BURST_EN | SUNXI_AHB_INCR8_BURST_EN |
49		SUNXI_AHB_INCR4_BURST_EN | SUNXI_AHB_INCRX_ALIGN_EN |
50		SUNXI_ULPI_BYPASS_EN;
51
52	if (phy->type == USBPHY_INTERFACE_MODE_HSIC)
53		bits |= SUNXI_HSIC | SUNXI_EHCI_HS_FORCE |
54			SUNXI_HSIC_CONNECT_DET | SUNXI_HSIC_CONNECT_INT;
55
56	reg_value = readl(phy->pmu);
57
58	if (enable)
59		reg_value |= bits;
60	else
61		reg_value &= ~bits;
62
63	writel(reg_value, phy->pmu);
64}
65
66static int sun9i_usb_phy_init(struct phy *_phy)
67{
68	struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
69	int ret;
70
71	ret = clk_prepare_enable(phy->clk);
72	if (ret)
73		goto err_clk;
74
75	ret = clk_prepare_enable(phy->hsic_clk);
76	if (ret)
77		goto err_hsic_clk;
78
79	ret = reset_control_deassert(phy->reset);
80	if (ret)
81		goto err_reset;
82
83	sun9i_usb_phy_passby(phy, 1);
84	return 0;
85
86err_reset:
87	clk_disable_unprepare(phy->hsic_clk);
88
89err_hsic_clk:
90	clk_disable_unprepare(phy->clk);
91
92err_clk:
93	return ret;
94}
95
96static int sun9i_usb_phy_exit(struct phy *_phy)
97{
98	struct sun9i_usb_phy *phy = phy_get_drvdata(_phy);
99
100	sun9i_usb_phy_passby(phy, 0);
101	reset_control_assert(phy->reset);
102	clk_disable_unprepare(phy->hsic_clk);
103	clk_disable_unprepare(phy->clk);
104
105	return 0;
106}
107
108static const struct phy_ops sun9i_usb_phy_ops = {
109	.init		= sun9i_usb_phy_init,
110	.exit		= sun9i_usb_phy_exit,
111	.owner		= THIS_MODULE,
112};
113
114static int sun9i_usb_phy_probe(struct platform_device *pdev)
115{
116	struct sun9i_usb_phy *phy;
117	struct device *dev = &pdev->dev;
118	struct device_node *np = dev->of_node;
119	struct phy_provider *phy_provider;
120
121	phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
122	if (!phy)
123		return -ENOMEM;
124
125	phy->type = of_usb_get_phy_mode(np);
126	if (phy->type == USBPHY_INTERFACE_MODE_HSIC) {
127		phy->clk = devm_clk_get(dev, "hsic_480M");
128		if (IS_ERR(phy->clk)) {
129			dev_err(dev, "failed to get hsic_480M clock\n");
130			return PTR_ERR(phy->clk);
131		}
132
133		phy->hsic_clk = devm_clk_get(dev, "hsic_12M");
134		if (IS_ERR(phy->hsic_clk)) {
135			dev_err(dev, "failed to get hsic_12M clock\n");
136			return PTR_ERR(phy->hsic_clk);
137		}
138
139		phy->reset = devm_reset_control_get(dev, "hsic");
140		if (IS_ERR(phy->reset)) {
141			dev_err(dev, "failed to get reset control\n");
142			return PTR_ERR(phy->reset);
143		}
144	} else {
145		phy->clk = devm_clk_get(dev, "phy");
146		if (IS_ERR(phy->clk)) {
147			dev_err(dev, "failed to get phy clock\n");
148			return PTR_ERR(phy->clk);
149		}
150
151		phy->reset = devm_reset_control_get(dev, "phy");
152		if (IS_ERR(phy->reset)) {
153			dev_err(dev, "failed to get reset control\n");
154			return PTR_ERR(phy->reset);
155		}
156	}
157
158	phy->pmu = devm_platform_ioremap_resource(pdev, 0);
159	if (IS_ERR(phy->pmu))
160		return PTR_ERR(phy->pmu);
161
162	phy->phy = devm_phy_create(dev, NULL, &sun9i_usb_phy_ops);
163	if (IS_ERR(phy->phy)) {
164		dev_err(dev, "failed to create PHY\n");
165		return PTR_ERR(phy->phy);
166	}
167
168	phy_set_drvdata(phy->phy, phy);
169	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
170
171	return PTR_ERR_OR_ZERO(phy_provider);
172}
173
174static const struct of_device_id sun9i_usb_phy_of_match[] = {
175	{ .compatible = "allwinner,sun9i-a80-usb-phy" },
176	{ },
177};
178MODULE_DEVICE_TABLE(of, sun9i_usb_phy_of_match);
179
180static struct platform_driver sun9i_usb_phy_driver = {
181	.probe	= sun9i_usb_phy_probe,
182	.driver = {
183		.of_match_table	= sun9i_usb_phy_of_match,
184		.name  = "sun9i-usb-phy",
185	}
186};
187module_platform_driver(sun9i_usb_phy_driver);
188
189MODULE_DESCRIPTION("Allwinner sun9i USB phy driver");
190MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
191MODULE_LICENSE("GPL");
192