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) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de>
3 *
4 * Partially based on a patch from
5 * Copyright (c) 2014 Stefan Roese <sr@denx.de>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * version 2, as published by the Free Software Foundation.
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/kernel.h>
18#include <linux/module.h>
19#include <linux/mdio.h>
20#include <linux/phy.h>
21#include <linux/of.h>
22
23#include "lan9303.h"
24
25/* Generate phy-addr and -reg from the input address */
26#define PHY_ADDR(x) ((((x) >> 6) + 0x10) & 0x1f)
27#define PHY_REG(x) (((x) >> 1) & 0x1f)
28
29struct lan9303_mdio {
30 struct mdio_device *device;
31 struct lan9303 chip;
32};
33
34static void lan9303_mdio_real_write(struct mdio_device *mdio, int reg, u16 val)
35{
36 mdio->bus->write(mdio->bus, PHY_ADDR(reg), PHY_REG(reg), val);
37}
38
39static int lan9303_mdio_write(void *ctx, uint32_t reg, uint32_t val)
40{
41 struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
42
43 reg <<= 2; /* reg num to offset */
44 mutex_lock(&sw_dev->device->bus->mdio_lock);
45 lan9303_mdio_real_write(sw_dev->device, reg, val & 0xffff);
46 lan9303_mdio_real_write(sw_dev->device, reg + 2, (val >> 16) & 0xffff);
47 mutex_unlock(&sw_dev->device->bus->mdio_lock);
48
49 return 0;
50}
51
52static u16 lan9303_mdio_real_read(struct mdio_device *mdio, int reg)
53{
54 return mdio->bus->read(mdio->bus, PHY_ADDR(reg), PHY_REG(reg));
55}
56
57static int lan9303_mdio_read(void *ctx, uint32_t reg, uint32_t *val)
58{
59 struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
60
61 reg <<= 2; /* reg num to offset */
62 mutex_lock(&sw_dev->device->bus->mdio_lock);
63 *val = lan9303_mdio_real_read(sw_dev->device, reg);
64 *val |= (lan9303_mdio_real_read(sw_dev->device, reg + 2) << 16);
65 mutex_unlock(&sw_dev->device->bus->mdio_lock);
66
67 return 0;
68}
69
70static int lan9303_mdio_phy_write(struct lan9303 *chip, int phy, int reg,
71 u16 val)
72{
73 struct lan9303_mdio *sw_dev = dev_get_drvdata(chip->dev);
74
75 return mdiobus_write_nested(sw_dev->device->bus, phy, reg, val);
76}
77
78static int lan9303_mdio_phy_read(struct lan9303 *chip, int phy, int reg)
79{
80 struct lan9303_mdio *sw_dev = dev_get_drvdata(chip->dev);
81
82 return mdiobus_read_nested(sw_dev->device->bus, phy, reg);
83}
84
85static const struct lan9303_phy_ops lan9303_mdio_phy_ops = {
86 .phy_read = lan9303_mdio_phy_read,
87 .phy_write = lan9303_mdio_phy_write,
88};
89
90static const struct regmap_config lan9303_mdio_regmap_config = {
91 .reg_bits = 8,
92 .val_bits = 32,
93 .reg_stride = 1,
94 .can_multi_write = true,
95 .max_register = 0x0ff, /* address bits 0..1 are not used */
96 .reg_format_endian = REGMAP_ENDIAN_LITTLE,
97
98 .volatile_table = &lan9303_register_set,
99 .wr_table = &lan9303_register_set,
100 .rd_table = &lan9303_register_set,
101
102 .reg_read = lan9303_mdio_read,
103 .reg_write = lan9303_mdio_write,
104
105 .cache_type = REGCACHE_NONE,
106};
107
108static int lan9303_mdio_probe(struct mdio_device *mdiodev)
109{
110 struct lan9303_mdio *sw_dev;
111 int ret;
112
113 sw_dev = devm_kzalloc(&mdiodev->dev, sizeof(struct lan9303_mdio),
114 GFP_KERNEL);
115 if (!sw_dev)
116 return -ENOMEM;
117
118 sw_dev->chip.regmap = devm_regmap_init(&mdiodev->dev, NULL, sw_dev,
119 &lan9303_mdio_regmap_config);
120 if (IS_ERR(sw_dev->chip.regmap)) {
121 ret = PTR_ERR(sw_dev->chip.regmap);
122 dev_err(&mdiodev->dev, "regmap init failed: %d\n", ret);
123 return ret;
124 }
125
126 /* link forward and backward */
127 sw_dev->device = mdiodev;
128 dev_set_drvdata(&mdiodev->dev, sw_dev);
129 sw_dev->chip.dev = &mdiodev->dev;
130
131 sw_dev->chip.ops = &lan9303_mdio_phy_ops;
132
133 ret = lan9303_probe(&sw_dev->chip, mdiodev->dev.of_node);
134 if (ret != 0)
135 return ret;
136
137 dev_info(&mdiodev->dev, "LAN9303 MDIO driver loaded successfully\n");
138
139 return 0;
140}
141
142static void lan9303_mdio_remove(struct mdio_device *mdiodev)
143{
144 struct lan9303_mdio *sw_dev = dev_get_drvdata(&mdiodev->dev);
145
146 if (!sw_dev)
147 return;
148
149 lan9303_remove(&sw_dev->chip);
150}
151
152/*-------------------------------------------------------------------------*/
153
154static const struct of_device_id lan9303_mdio_of_match[] = {
155 { .compatible = "smsc,lan9303-mdio" },
156 { /* sentinel */ },
157};
158MODULE_DEVICE_TABLE(of, lan9303_mdio_of_match);
159
160static struct mdio_driver lan9303_mdio_driver = {
161 .mdiodrv.driver = {
162 .name = "LAN9303_MDIO",
163 .of_match_table = of_match_ptr(lan9303_mdio_of_match),
164 },
165 .probe = lan9303_mdio_probe,
166 .remove = lan9303_mdio_remove,
167};
168mdio_module_driver(lan9303_mdio_driver);
169
170MODULE_AUTHOR("Stefan Roese <sr@denx.de>, Juergen Borleis <kernel@pengutronix.de>");
171MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in MDIO managed mode");
172MODULE_LICENSE("GPL v2");