1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de>
4 *
5 * Partially based on a patch from
6 * Copyright (c) 2014 Stefan Roese <sr@denx.de>
7 */
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/mdio.h>
11 #include <linux/phy.h>
12 #include <linux/of.h>
13
14 #include "lan9303.h"
15
16 /* Generate phy-addr and -reg from the input address */
17 #define PHY_ADDR(x) ((((x) >> 6) + 0x10) & 0x1f)
18 #define PHY_REG(x) (((x) >> 1) & 0x1f)
19
20 struct lan9303_mdio {
21 struct mdio_device *device;
22 struct lan9303 chip;
23 };
24
lan9303_mdio_real_write(struct mdio_device * mdio,int reg,u16 val)25 static void lan9303_mdio_real_write(struct mdio_device *mdio, int reg, u16 val)
26 {
27 mdio->bus->write(mdio->bus, PHY_ADDR(reg), PHY_REG(reg), val);
28 }
29
lan9303_mdio_write(void * ctx,uint32_t reg,uint32_t val)30 static int lan9303_mdio_write(void *ctx, uint32_t reg, uint32_t val)
31 {
32 struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
33
34 reg <<= 2; /* reg num to offset */
35 mutex_lock_nested(&sw_dev->device->bus->mdio_lock, MDIO_MUTEX_NESTED);
36 lan9303_mdio_real_write(sw_dev->device, reg, val & 0xffff);
37 lan9303_mdio_real_write(sw_dev->device, reg + 2, (val >> 16) & 0xffff);
38 mutex_unlock(&sw_dev->device->bus->mdio_lock);
39
40 return 0;
41 }
42
lan9303_mdio_real_read(struct mdio_device * mdio,int reg)43 static u16 lan9303_mdio_real_read(struct mdio_device *mdio, int reg)
44 {
45 return mdio->bus->read(mdio->bus, PHY_ADDR(reg), PHY_REG(reg));
46 }
47
lan9303_mdio_read(void * ctx,uint32_t reg,uint32_t * val)48 static int lan9303_mdio_read(void *ctx, uint32_t reg, uint32_t *val)
49 {
50 struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
51
52 reg <<= 2; /* reg num to offset */
53 mutex_lock_nested(&sw_dev->device->bus->mdio_lock, MDIO_MUTEX_NESTED);
54 *val = lan9303_mdio_real_read(sw_dev->device, reg);
55 *val |= (lan9303_mdio_real_read(sw_dev->device, reg + 2) << 16);
56 mutex_unlock(&sw_dev->device->bus->mdio_lock);
57
58 return 0;
59 }
60
lan9303_mdio_phy_write(struct lan9303 * chip,int phy,int reg,u16 val)61 static int lan9303_mdio_phy_write(struct lan9303 *chip, int phy, int reg,
62 u16 val)
63 {
64 struct lan9303_mdio *sw_dev = dev_get_drvdata(chip->dev);
65
66 return mdiobus_write_nested(sw_dev->device->bus, phy, reg, val);
67 }
68
lan9303_mdio_phy_read(struct lan9303 * chip,int phy,int reg)69 static int lan9303_mdio_phy_read(struct lan9303 *chip, int phy, int reg)
70 {
71 struct lan9303_mdio *sw_dev = dev_get_drvdata(chip->dev);
72
73 return mdiobus_read_nested(sw_dev->device->bus, phy, reg);
74 }
75
76 static const struct lan9303_phy_ops lan9303_mdio_phy_ops = {
77 .phy_read = lan9303_mdio_phy_read,
78 .phy_write = lan9303_mdio_phy_write,
79 };
80
81 static const struct regmap_config lan9303_mdio_regmap_config = {
82 .reg_bits = 8,
83 .val_bits = 32,
84 .reg_stride = 1,
85 .can_multi_write = true,
86 .max_register = 0x0ff, /* address bits 0..1 are not used */
87 .reg_format_endian = REGMAP_ENDIAN_LITTLE,
88
89 .volatile_table = &lan9303_register_set,
90 .wr_table = &lan9303_register_set,
91 .rd_table = &lan9303_register_set,
92
93 .reg_read = lan9303_mdio_read,
94 .reg_write = lan9303_mdio_write,
95
96 .cache_type = REGCACHE_NONE,
97 };
98
lan9303_mdio_probe(struct mdio_device * mdiodev)99 static int lan9303_mdio_probe(struct mdio_device *mdiodev)
100 {
101 struct lan9303_mdio *sw_dev;
102 int ret;
103
104 sw_dev = devm_kzalloc(&mdiodev->dev, sizeof(struct lan9303_mdio),
105 GFP_KERNEL);
106 if (!sw_dev)
107 return -ENOMEM;
108
109 sw_dev->chip.regmap = devm_regmap_init(&mdiodev->dev, NULL, sw_dev,
110 &lan9303_mdio_regmap_config);
111 if (IS_ERR(sw_dev->chip.regmap)) {
112 ret = PTR_ERR(sw_dev->chip.regmap);
113 dev_err(&mdiodev->dev, "regmap init failed: %d\n", ret);
114 return ret;
115 }
116
117 /* link forward and backward */
118 sw_dev->device = mdiodev;
119 dev_set_drvdata(&mdiodev->dev, sw_dev);
120 sw_dev->chip.dev = &mdiodev->dev;
121
122 sw_dev->chip.ops = &lan9303_mdio_phy_ops;
123
124 ret = lan9303_probe(&sw_dev->chip, mdiodev->dev.of_node);
125 if (ret != 0)
126 return ret;
127
128 dev_info(&mdiodev->dev, "LAN9303 MDIO driver loaded successfully\n");
129
130 return 0;
131 }
132
lan9303_mdio_remove(struct mdio_device * mdiodev)133 static void lan9303_mdio_remove(struct mdio_device *mdiodev)
134 {
135 struct lan9303_mdio *sw_dev = dev_get_drvdata(&mdiodev->dev);
136
137 if (!sw_dev)
138 return;
139
140 lan9303_remove(&sw_dev->chip);
141 }
142
lan9303_mdio_shutdown(struct mdio_device * mdiodev)143 static void lan9303_mdio_shutdown(struct mdio_device *mdiodev)
144 {
145 struct lan9303_mdio *sw_dev = dev_get_drvdata(&mdiodev->dev);
146
147 if (!sw_dev)
148 return;
149
150 lan9303_shutdown(&sw_dev->chip);
151
152 dev_set_drvdata(&mdiodev->dev, NULL);
153 }
154
155 /*-------------------------------------------------------------------------*/
156
157 static const struct of_device_id lan9303_mdio_of_match[] = {
158 { .compatible = "smsc,lan9303-mdio" },
159 { .compatible = "microchip,lan9354-mdio" },
160 { /* sentinel */ },
161 };
162 MODULE_DEVICE_TABLE(of, lan9303_mdio_of_match);
163
164 static struct mdio_driver lan9303_mdio_driver = {
165 .mdiodrv.driver = {
166 .name = "LAN9303_MDIO",
167 .of_match_table = lan9303_mdio_of_match,
168 },
169 .probe = lan9303_mdio_probe,
170 .remove = lan9303_mdio_remove,
171 .shutdown = lan9303_mdio_shutdown,
172 };
173 mdio_module_driver(lan9303_mdio_driver);
174
175 MODULE_AUTHOR("Stefan Roese <sr@denx.de>, Juergen Borleis <kernel@pengutronix.de>");
176 MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in MDIO managed mode");
177 MODULE_LICENSE("GPL v2");
178