summaryrefslogtreecommitdiff
path: root/drivers/phy/phy-bcm-nsp-usb3.c
blob: 49024eaa55459b062799e3d19e824dda9c5f7337 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
/*
 * Copyright (C) 2016 Broadcom
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation version 2.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/delay.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/mdio.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/phy/phy.h>
#include <linux/regmap.h>

#define NSP_USB3_RST_CTRL_OFFSET	0x3f8

/* mdio reg access */
#define NSP_USB3_PHY_BASE_ADDR_REG	0x1f

#define NSP_USB3_PHY_PLL30_BLOCK	0x8000
#define NSP_USB3_PLL_CONTROL		0x01
#define NSP_USB3_PLLA_CONTROL0		0x0a
#define NSP_USB3_PLLA_CONTROL1		0x0b

#define NSP_USB3_PHY_TX_PMD_BLOCK	0x8040
#define NSP_USB3_TX_PMD_CONTROL1	0x01

#define NSP_USB3_PHY_PIPE_BLOCK		0x8060
#define NSP_USB3_LFPS_CMP		0x02
#define NSP_USB3_LFPS_DEGLITCH		0x03

struct nsp_usb3_phy {
	struct regmap *usb3_ctrl;
	struct phy *phy;
	struct mdio_device *mdiodev;
};

static int nsp_usb3_phy_init(struct phy *phy)
{
	struct nsp_usb3_phy *iphy = phy_get_drvdata(phy);
	struct mii_bus *bus = iphy->mdiodev->bus;
	int addr = iphy->mdiodev->addr;
	u32 data;
	int rc;

	rc = regmap_read(iphy->usb3_ctrl, 0, &data);
	if (rc)
		return rc;
	data |= 1;
	rc = regmap_write(iphy->usb3_ctrl, 0, data);
	if (rc)
		return rc;

	rc = regmap_write(iphy->usb3_ctrl, NSP_USB3_RST_CTRL_OFFSET, 1);
	if (rc)
		return rc;

	rc = mdiobus_write(bus, addr, NSP_USB3_PHY_BASE_ADDR_REG,
			   NSP_USB3_PHY_PLL30_BLOCK);
	if (rc)
		return rc;

	rc = mdiobus_write(bus, addr, NSP_USB3_PLL_CONTROL, 0x1000);
	if (rc)
		return rc;

	rc = mdiobus_write(bus, addr, NSP_USB3_PLLA_CONTROL0, 0x6400);
	if (rc)
		return rc;

	rc = mdiobus_write(bus, addr, NSP_USB3_PLLA_CONTROL1, 0xc000);
	if (rc)
		return rc;

	rc = mdiobus_write(bus, addr, NSP_USB3_PLLA_CONTROL1, 0x8000);
	if (rc)
		return rc;

	rc = regmap_write(iphy->usb3_ctrl, NSP_USB3_RST_CTRL_OFFSET, 0);
	if (rc)
		return rc;

	rc = mdiobus_write(bus, addr, NSP_USB3_PLL_CONTROL, 0x9000);
	if (rc)
		return rc;

	rc = mdiobus_write(bus, addr, NSP_USB3_PHY_BASE_ADDR_REG,
			   NSP_USB3_PHY_PIPE_BLOCK);
	if (rc)
		return rc;

	rc = mdiobus_write(bus, addr, NSP_USB3_LFPS_CMP, 0xf30d);
	if (rc)
		return rc;

	rc = mdiobus_write(bus, addr, NSP_USB3_LFPS_DEGLITCH, 0x6302);
	if (rc)
		return rc;

	rc = mdiobus_write(bus, addr, NSP_USB3_PHY_BASE_ADDR_REG,
			   NSP_USB3_PHY_TX_PMD_BLOCK);
	if (rc)
		return rc;

	rc = mdiobus_write(bus, addr, NSP_USB3_TX_PMD_CONTROL1, 0x1003);

	return rc;
}

static struct phy_ops nsp_usb3_phy_ops = {
	.init	= nsp_usb3_phy_init,
	.owner	= THIS_MODULE,
};

static int nsp_usb3_phy_probe(struct mdio_device *mdiodev)
{
	struct device *dev = &mdiodev->dev;
	struct phy_provider *provider;
	struct nsp_usb3_phy *iphy;

	iphy = devm_kzalloc(dev, sizeof(*iphy), GFP_KERNEL);
	if (!iphy)
		return -ENOMEM;
	iphy->mdiodev = mdiodev;

	iphy->usb3_ctrl = syscon_regmap_lookup_by_phandle(dev->of_node,
						 "usb3-ctrl-syscon");
	if (IS_ERR(iphy->usb3_ctrl))
		return PTR_ERR(iphy->usb3_ctrl);

	iphy->phy = devm_phy_create(dev, dev->of_node, &nsp_usb3_phy_ops);
	if (IS_ERR(iphy->phy)) {
		dev_err(dev, "failed to create PHY\n");
		return PTR_ERR(iphy->phy);
	}

	phy_set_drvdata(iphy->phy, iphy);

	provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
	if (IS_ERR(provider)) {
		dev_err(dev, "could not register PHY provider\n");
		return PTR_ERR(provider);
	}

	return 0;
}

static const struct of_device_id nsp_usb3_phy_of_match[] = {
	{.compatible = "brcm,nsp-usb3-phy",},
	{ /* sentinel */ }
};

static struct mdio_driver nsp_usb3_phy_driver = {
	.mdiodrv = {
		.driver = {
			.name = "nsp-usb3-phy",
			.of_match_table = nsp_usb3_phy_of_match,
		},
	},
	.probe = nsp_usb3_phy_probe,
};

mdio_module_driver(nsp_usb3_phy_driver);

MODULE_DESCRIPTION("Broadcom NSP USB3 PHY driver");
MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com");