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 Broadcom
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation version 2.
7 *
8 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
9 * kind, whether express or implied; without even the implied warranty
10 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 */
13
14#include <linux/delay.h>
15#include <linux/io.h>
16#include <linux/kernel.h>
17#include <linux/mfd/syscon.h>
18#include <linux/mdio.h>
19#include <linux/module.h>
20#include <linux/of.h>
21#include <linux/of_address.h>
22#include <linux/phy/phy.h>
23#include <linux/regmap.h>
24
25#define NSP_USB3_RST_CTRL_OFFSET 0x3f8
26
27/* mdio reg access */
28#define NSP_USB3_PHY_BASE_ADDR_REG 0x1f
29
30#define NSP_USB3_PHY_PLL30_BLOCK 0x8000
31#define NSP_USB3_PLL_CONTROL 0x01
32#define NSP_USB3_PLLA_CONTROL0 0x0a
33#define NSP_USB3_PLLA_CONTROL1 0x0b
34
35#define NSP_USB3_PHY_TX_PMD_BLOCK 0x8040
36#define NSP_USB3_TX_PMD_CONTROL1 0x01
37
38#define NSP_USB3_PHY_PIPE_BLOCK 0x8060
39#define NSP_USB3_LFPS_CMP 0x02
40#define NSP_USB3_LFPS_DEGLITCH 0x03
41
42struct nsp_usb3_phy {
43 struct regmap *usb3_ctrl;
44 struct phy *phy;
45 struct mdio_device *mdiodev;
46};
47
48static int nsp_usb3_phy_init(struct phy *phy)
49{
50 struct nsp_usb3_phy *iphy = phy_get_drvdata(phy);
51 struct mii_bus *bus = iphy->mdiodev->bus;
52 int addr = iphy->mdiodev->addr;
53 u32 data;
54 int rc;
55
56 rc = regmap_read(iphy->usb3_ctrl, 0, &data);
57 if (rc)
58 return rc;
59 data |= 1;
60 rc = regmap_write(iphy->usb3_ctrl, 0, data);
61 if (rc)
62 return rc;
63
64 rc = regmap_write(iphy->usb3_ctrl, NSP_USB3_RST_CTRL_OFFSET, 1);
65 if (rc)
66 return rc;
67
68 rc = mdiobus_write(bus, addr, NSP_USB3_PHY_BASE_ADDR_REG,
69 NSP_USB3_PHY_PLL30_BLOCK);
70 if (rc)
71 return rc;
72
73 rc = mdiobus_write(bus, addr, NSP_USB3_PLL_CONTROL, 0x1000);
74 if (rc)
75 return rc;
76
77 rc = mdiobus_write(bus, addr, NSP_USB3_PLLA_CONTROL0, 0x6400);
78 if (rc)
79 return rc;
80
81 rc = mdiobus_write(bus, addr, NSP_USB3_PLLA_CONTROL1, 0xc000);
82 if (rc)
83 return rc;
84
85 rc = mdiobus_write(bus, addr, NSP_USB3_PLLA_CONTROL1, 0x8000);
86 if (rc)
87 return rc;
88
89 rc = regmap_write(iphy->usb3_ctrl, NSP_USB3_RST_CTRL_OFFSET, 0);
90 if (rc)
91 return rc;
92
93 rc = mdiobus_write(bus, addr, NSP_USB3_PLL_CONTROL, 0x9000);
94 if (rc)
95 return rc;
96
97 rc = mdiobus_write(bus, addr, NSP_USB3_PHY_BASE_ADDR_REG,
98 NSP_USB3_PHY_PIPE_BLOCK);
99 if (rc)
100 return rc;
101
102 rc = mdiobus_write(bus, addr, NSP_USB3_LFPS_CMP, 0xf30d);
103 if (rc)
104 return rc;
105
106 rc = mdiobus_write(bus, addr, NSP_USB3_LFPS_DEGLITCH, 0x6302);
107 if (rc)
108 return rc;
109
110 rc = mdiobus_write(bus, addr, NSP_USB3_PHY_BASE_ADDR_REG,
111 NSP_USB3_PHY_TX_PMD_BLOCK);
112 if (rc)
113 return rc;
114
115 rc = mdiobus_write(bus, addr, NSP_USB3_TX_PMD_CONTROL1, 0x1003);
116
117 return rc;
118}
119
120static struct phy_ops nsp_usb3_phy_ops = {
121 .init = nsp_usb3_phy_init,
122 .owner = THIS_MODULE,
123};
124
125static int nsp_usb3_phy_probe(struct mdio_device *mdiodev)
126{
127 struct device *dev = &mdiodev->dev;
128 struct phy_provider *provider;
129 struct nsp_usb3_phy *iphy;
130
131 iphy = devm_kzalloc(dev, sizeof(*iphy), GFP_KERNEL);
132 if (!iphy)
133 return -ENOMEM;
134 iphy->mdiodev = mdiodev;
135
136 iphy->usb3_ctrl = syscon_regmap_lookup_by_phandle(dev->of_node,
137 "usb3-ctrl-syscon");
138 if (IS_ERR(iphy->usb3_ctrl))
139 return PTR_ERR(iphy->usb3_ctrl);
140
141 iphy->phy = devm_phy_create(dev, dev->of_node, &nsp_usb3_phy_ops);
142 if (IS_ERR(iphy->phy)) {
143 dev_err(dev, "failed to create PHY\n");
144 return PTR_ERR(iphy->phy);
145 }
146
147 phy_set_drvdata(iphy->phy, iphy);
148
149 provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
150 if (IS_ERR(provider)) {
151 dev_err(dev, "could not register PHY provider\n");
152 return PTR_ERR(provider);
153 }
154
155 return 0;
156}
157
158static const struct of_device_id nsp_usb3_phy_of_match[] = {
159 {.compatible = "brcm,nsp-usb3-phy",},
160 { /* sentinel */ }
161};
162
163static struct mdio_driver nsp_usb3_phy_driver = {
164 .mdiodrv = {
165 .driver = {
166 .name = "nsp-usb3-phy",
167 .of_match_table = nsp_usb3_phy_of_match,
168 },
169 },
170 .probe = nsp_usb3_phy_probe,
171};
172
173mdio_module_driver(nsp_usb3_phy_driver);
174
175MODULE_DESCRIPTION("Broadcom NSP USB3 PHY driver");
176MODULE_LICENSE("GPL v2");
177MODULE_AUTHOR("Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com");