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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * phy-bcm-kona-usb2.c - Broadcom Kona USB2 Phy Driver
4 *
5 * Copyright (C) 2013 Linaro Limited
6 * Matt Porter <mporter@linaro.org>
7 */
8
9#include <linux/clk.h>
10#include <linux/delay.h>
11#include <linux/err.h>
12#include <linux/io.h>
13#include <linux/module.h>
14#include <linux/of.h>
15#include <linux/phy/phy.h>
16#include <linux/platform_device.h>
17
18#define OTGCTL (0)
19#define OTGCTL_OTGSTAT2 BIT(31)
20#define OTGCTL_OTGSTAT1 BIT(30)
21#define OTGCTL_PRST_N_SW BIT(11)
22#define OTGCTL_HRESET_N BIT(10)
23#define OTGCTL_UTMI_LINE_STATE1 BIT(9)
24#define OTGCTL_UTMI_LINE_STATE0 BIT(8)
25
26#define P1CTL (8)
27#define P1CTL_SOFT_RESET BIT(1)
28#define P1CTL_NON_DRIVING BIT(0)
29
30struct bcm_kona_usb {
31 void __iomem *regs;
32};
33
34static void bcm_kona_usb_phy_power(struct bcm_kona_usb *phy, int on)
35{
36 u32 val;
37
38 val = readl(phy->regs + OTGCTL);
39 if (on) {
40 /* Configure and power PHY */
41 val &= ~(OTGCTL_OTGSTAT2 | OTGCTL_OTGSTAT1 |
42 OTGCTL_UTMI_LINE_STATE1 | OTGCTL_UTMI_LINE_STATE0);
43 val |= OTGCTL_PRST_N_SW | OTGCTL_HRESET_N;
44 } else {
45 val &= ~(OTGCTL_PRST_N_SW | OTGCTL_HRESET_N);
46 }
47 writel(val, phy->regs + OTGCTL);
48}
49
50static int bcm_kona_usb_phy_init(struct phy *gphy)
51{
52 struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
53 u32 val;
54
55 /* Soft reset PHY */
56 val = readl(phy->regs + P1CTL);
57 val &= ~P1CTL_NON_DRIVING;
58 val |= P1CTL_SOFT_RESET;
59 writel(val, phy->regs + P1CTL);
60 writel(val & ~P1CTL_SOFT_RESET, phy->regs + P1CTL);
61 /* Reset needs to be asserted for 2ms */
62 mdelay(2);
63 writel(val | P1CTL_SOFT_RESET, phy->regs + P1CTL);
64
65 return 0;
66}
67
68static int bcm_kona_usb_phy_power_on(struct phy *gphy)
69{
70 struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
71
72 bcm_kona_usb_phy_power(phy, 1);
73
74 return 0;
75}
76
77static int bcm_kona_usb_phy_power_off(struct phy *gphy)
78{
79 struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
80
81 bcm_kona_usb_phy_power(phy, 0);
82
83 return 0;
84}
85
86static const struct phy_ops ops = {
87 .init = bcm_kona_usb_phy_init,
88 .power_on = bcm_kona_usb_phy_power_on,
89 .power_off = bcm_kona_usb_phy_power_off,
90 .owner = THIS_MODULE,
91};
92
93static int bcm_kona_usb2_probe(struct platform_device *pdev)
94{
95 struct device *dev = &pdev->dev;
96 struct bcm_kona_usb *phy;
97 struct phy *gphy;
98 struct phy_provider *phy_provider;
99
100 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
101 if (!phy)
102 return -ENOMEM;
103
104 phy->regs = devm_platform_ioremap_resource(pdev, 0);
105 if (IS_ERR(phy->regs))
106 return PTR_ERR(phy->regs);
107
108 platform_set_drvdata(pdev, phy);
109
110 gphy = devm_phy_create(dev, NULL, &ops);
111 if (IS_ERR(gphy))
112 return PTR_ERR(gphy);
113
114 /* The Kona PHY supports an 8-bit wide UTMI interface */
115 phy_set_bus_width(gphy, 8);
116
117 phy_set_drvdata(gphy, phy);
118
119 phy_provider = devm_of_phy_provider_register(dev,
120 of_phy_simple_xlate);
121
122 return PTR_ERR_OR_ZERO(phy_provider);
123}
124
125static const struct of_device_id bcm_kona_usb2_dt_ids[] = {
126 { .compatible = "brcm,kona-usb2-phy" },
127 { /* sentinel */ }
128};
129
130MODULE_DEVICE_TABLE(of, bcm_kona_usb2_dt_ids);
131
132static struct platform_driver bcm_kona_usb2_driver = {
133 .probe = bcm_kona_usb2_probe,
134 .driver = {
135 .name = "bcm-kona-usb2",
136 .of_match_table = bcm_kona_usb2_dt_ids,
137 },
138};
139
140module_platform_driver(bcm_kona_usb2_driver);
141
142MODULE_ALIAS("platform:bcm-kona-usb2");
143MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
144MODULE_DESCRIPTION("BCM Kona USB 2.0 PHY driver");
145MODULE_LICENSE("GPL v2");