blob: e94f5a6a5645a33acaad36e64da7ac9c2d44b364 [file] [log] [blame]
Matt Porter7597fdf2013-12-19 09:23:09 -05001/*
2 * phy-bcm-kona-usb2.c - Broadcom Kona USB2 Phy Driver
3 *
4 * Copyright (C) 2013 Linaro Limited
5 * Matt Porter <mporter@linaro.org>
6 *
7 * This software is licensed under the terms of the GNU General Public
8 * License version 2, as published by the Free Software Foundation, and
9 * may be copied, distributed, and modified under those terms.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17#include <linux/clk.h>
18#include <linux/delay.h>
19#include <linux/err.h>
20#include <linux/io.h>
21#include <linux/module.h>
22#include <linux/of.h>
23#include <linux/phy/phy.h>
24#include <linux/platform_device.h>
25
26#define OTGCTL (0)
27#define OTGCTL_OTGSTAT2 BIT(31)
28#define OTGCTL_OTGSTAT1 BIT(30)
29#define OTGCTL_PRST_N_SW BIT(11)
30#define OTGCTL_HRESET_N BIT(10)
31#define OTGCTL_UTMI_LINE_STATE1 BIT(9)
32#define OTGCTL_UTMI_LINE_STATE0 BIT(8)
33
34#define P1CTL (8)
35#define P1CTL_SOFT_RESET BIT(1)
36#define P1CTL_NON_DRIVING BIT(0)
37
38struct bcm_kona_usb {
39 void __iomem *regs;
40};
41
42static void bcm_kona_usb_phy_power(struct bcm_kona_usb *phy, int on)
43{
44 u32 val;
45
46 val = readl(phy->regs + OTGCTL);
47 if (on) {
48 /* Configure and power PHY */
49 val &= ~(OTGCTL_OTGSTAT2 | OTGCTL_OTGSTAT1 |
50 OTGCTL_UTMI_LINE_STATE1 | OTGCTL_UTMI_LINE_STATE0);
51 val |= OTGCTL_PRST_N_SW | OTGCTL_HRESET_N;
52 } else {
53 val &= ~(OTGCTL_PRST_N_SW | OTGCTL_HRESET_N);
54 }
55 writel(val, phy->regs + OTGCTL);
56}
57
58static int bcm_kona_usb_phy_init(struct phy *gphy)
59{
60 struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
61 u32 val;
62
63 /* Soft reset PHY */
64 val = readl(phy->regs + P1CTL);
65 val &= ~P1CTL_NON_DRIVING;
66 val |= P1CTL_SOFT_RESET;
67 writel(val, phy->regs + P1CTL);
68 writel(val & ~P1CTL_SOFT_RESET, phy->regs + P1CTL);
69 /* Reset needs to be asserted for 2ms */
70 mdelay(2);
71 writel(val | P1CTL_SOFT_RESET, phy->regs + P1CTL);
72
73 return 0;
74}
75
76static int bcm_kona_usb_phy_power_on(struct phy *gphy)
77{
78 struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
79
80 bcm_kona_usb_phy_power(phy, 1);
81
82 return 0;
83}
84
85static int bcm_kona_usb_phy_power_off(struct phy *gphy)
86{
87 struct bcm_kona_usb *phy = phy_get_drvdata(gphy);
88
89 bcm_kona_usb_phy_power(phy, 0);
90
91 return 0;
92}
93
94static struct phy_ops ops = {
95 .init = bcm_kona_usb_phy_init,
96 .power_on = bcm_kona_usb_phy_power_on,
97 .power_off = bcm_kona_usb_phy_power_off,
98 .owner = THIS_MODULE,
99};
100
101static int bcm_kona_usb2_probe(struct platform_device *pdev)
102{
103 struct device *dev = &pdev->dev;
104 struct bcm_kona_usb *phy;
105 struct resource *res;
106 struct phy *gphy;
107 struct phy_provider *phy_provider;
108
109 phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
110 if (!phy)
111 return -ENOMEM;
112
113 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
114 phy->regs = devm_ioremap_resource(&pdev->dev, res);
115 if (IS_ERR(phy->regs))
116 return PTR_ERR(phy->regs);
117
118 platform_set_drvdata(pdev, phy);
119
120 gphy = devm_phy_create(dev, &ops, NULL);
121 if (IS_ERR(gphy))
122 return PTR_ERR(gphy);
123
124 /* The Kona PHY supports an 8-bit wide UTMI interface */
125 phy_set_bus_width(gphy, 8);
126
127 phy_set_drvdata(gphy, phy);
128
129 phy_provider = devm_of_phy_provider_register(dev,
130 of_phy_simple_xlate);
Matt Porter7597fdf2013-12-19 09:23:09 -0500131
Sachin Kamate4b9f782014-02-03 13:55:05 +0530132 return PTR_ERR_OR_ZERO(phy_provider);
Matt Porter7597fdf2013-12-19 09:23:09 -0500133}
134
135static const struct of_device_id bcm_kona_usb2_dt_ids[] = {
136 { .compatible = "brcm,kona-usb2-phy" },
137 { /* sentinel */ }
138};
139
140MODULE_DEVICE_TABLE(of, bcm_kona_usb2_dt_ids);
141
142static struct platform_driver bcm_kona_usb2_driver = {
143 .probe = bcm_kona_usb2_probe,
144 .driver = {
145 .name = "bcm-kona-usb2",
146 .owner = THIS_MODULE,
147 .of_match_table = bcm_kona_usb2_dt_ids,
148 },
149};
150
151module_platform_driver(bcm_kona_usb2_driver);
152
153MODULE_ALIAS("platform:bcm-kona-usb2");
154MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
155MODULE_DESCRIPTION("BCM Kona USB 2.0 PHY driver");
156MODULE_LICENSE("GPL v2");