tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Microchip KSZ8863 series register access through SMI
4 *
5 * Copyright (C) 2019 Pengutronix, Michael Grzeschik <kernel@pengutronix.de>
6 */
7
8#include "ksz8.h"
9#include "ksz_common.h"
10
11/* Serial Management Interface (SMI) uses the following frame format:
12 *
13 * preamble|start|Read/Write| PHY | REG |TA| Data bits | Idle
14 * |frame| OP code |address |address| | |
15 * read | 32x1´s | 01 | 00 | 1xRRR | RRRRR |Z0| 00000000DDDDDDDD | Z
16 * write| 32x1´s | 01 | 00 | 0xRRR | RRRRR |10| xxxxxxxxDDDDDDDD | Z
17 *
18 */
19
20#define SMI_KSZ88XX_READ_PHY BIT(4)
21
22static int ksz8863_mdio_read(void *ctx, const void *reg_buf, size_t reg_len,
23 void *val_buf, size_t val_len)
24{
25 struct ksz_device *dev = ctx;
26 struct mdio_device *mdev;
27 u8 reg = *(u8 *)reg_buf;
28 u8 *val = val_buf;
29 int i, ret = 0;
30
31 mdev = dev->priv;
32
33 mutex_lock_nested(&mdev->bus->mdio_lock, MDIO_MUTEX_NESTED);
34 for (i = 0; i < val_len; i++) {
35 int tmp = reg + i;
36
37 ret = __mdiobus_read(mdev->bus, ((tmp & 0xE0) >> 5) |
38 SMI_KSZ88XX_READ_PHY, tmp);
39 if (ret < 0)
40 goto out;
41
42 val[i] = ret;
43 }
44 ret = 0;
45
46 out:
47 mutex_unlock(&mdev->bus->mdio_lock);
48
49 return ret;
50}
51
52static int ksz8863_mdio_write(void *ctx, const void *data, size_t count)
53{
54 struct ksz_device *dev = ctx;
55 struct mdio_device *mdev;
56 int i, ret = 0;
57 u32 reg;
58 u8 *val;
59
60 mdev = dev->priv;
61
62 val = (u8 *)(data + 4);
63 reg = *(u32 *)data;
64
65 mutex_lock_nested(&mdev->bus->mdio_lock, MDIO_MUTEX_NESTED);
66 for (i = 0; i < (count - 4); i++) {
67 int tmp = reg + i;
68
69 ret = __mdiobus_write(mdev->bus, ((tmp & 0xE0) >> 5),
70 tmp, val[i]);
71 if (ret < 0)
72 goto out;
73 }
74
75 out:
76 mutex_unlock(&mdev->bus->mdio_lock);
77
78 return ret;
79}
80
81static const struct regmap_bus regmap_smi[] = {
82 {
83 .read = ksz8863_mdio_read,
84 .write = ksz8863_mdio_write,
85 },
86 {
87 .read = ksz8863_mdio_read,
88 .write = ksz8863_mdio_write,
89 .val_format_endian_default = REGMAP_ENDIAN_BIG,
90 },
91 {
92 .read = ksz8863_mdio_read,
93 .write = ksz8863_mdio_write,
94 .val_format_endian_default = REGMAP_ENDIAN_BIG,
95 }
96};
97
98static const struct regmap_config ksz8863_regmap_config[] = {
99 {
100 .name = "#8",
101 .reg_bits = 8,
102 .pad_bits = 24,
103 .val_bits = 8,
104 .cache_type = REGCACHE_NONE,
105 .lock = ksz_regmap_lock,
106 .unlock = ksz_regmap_unlock,
107 },
108 {
109 .name = "#16",
110 .reg_bits = 8,
111 .pad_bits = 24,
112 .val_bits = 16,
113 .cache_type = REGCACHE_NONE,
114 .lock = ksz_regmap_lock,
115 .unlock = ksz_regmap_unlock,
116 },
117 {
118 .name = "#32",
119 .reg_bits = 8,
120 .pad_bits = 24,
121 .val_bits = 32,
122 .cache_type = REGCACHE_NONE,
123 .lock = ksz_regmap_lock,
124 .unlock = ksz_regmap_unlock,
125 }
126};
127
128static int ksz8863_smi_probe(struct mdio_device *mdiodev)
129{
130 struct regmap_config rc;
131 struct ksz_device *dev;
132 int ret;
133 int i;
134
135 dev = ksz_switch_alloc(&mdiodev->dev, mdiodev);
136 if (!dev)
137 return -ENOMEM;
138
139 for (i = 0; i < ARRAY_SIZE(ksz8863_regmap_config); i++) {
140 rc = ksz8863_regmap_config[i];
141 rc.lock_arg = &dev->regmap_mutex;
142 dev->regmap[i] = devm_regmap_init(&mdiodev->dev,
143 ®map_smi[i], dev,
144 &rc);
145 if (IS_ERR(dev->regmap[i])) {
146 return dev_err_probe(&mdiodev->dev,
147 PTR_ERR(dev->regmap[i]),
148 "Failed to initialize regmap%i\n",
149 ksz8863_regmap_config[i].val_bits);
150 }
151 }
152
153 if (mdiodev->dev.platform_data)
154 dev->pdata = mdiodev->dev.platform_data;
155
156 ret = ksz_switch_register(dev);
157
158 /* Main DSA driver may not be started yet. */
159 if (ret)
160 return ret;
161
162 dev_set_drvdata(&mdiodev->dev, dev);
163
164 return 0;
165}
166
167static void ksz8863_smi_remove(struct mdio_device *mdiodev)
168{
169 struct ksz_device *dev = dev_get_drvdata(&mdiodev->dev);
170
171 if (dev)
172 ksz_switch_remove(dev);
173}
174
175static void ksz8863_smi_shutdown(struct mdio_device *mdiodev)
176{
177 struct ksz_device *dev = dev_get_drvdata(&mdiodev->dev);
178
179 if (dev)
180 dsa_switch_shutdown(dev->ds);
181
182 dev_set_drvdata(&mdiodev->dev, NULL);
183}
184
185static const struct of_device_id ksz8863_dt_ids[] = {
186 {
187 .compatible = "microchip,ksz8863",
188 .data = &ksz_switch_chips[KSZ8830]
189 },
190 {
191 .compatible = "microchip,ksz8873",
192 .data = &ksz_switch_chips[KSZ8830]
193 },
194 { },
195};
196MODULE_DEVICE_TABLE(of, ksz8863_dt_ids);
197
198static struct mdio_driver ksz8863_driver = {
199 .probe = ksz8863_smi_probe,
200 .remove = ksz8863_smi_remove,
201 .shutdown = ksz8863_smi_shutdown,
202 .mdiodrv.driver = {
203 .name = "ksz8863-switch",
204 .of_match_table = ksz8863_dt_ids,
205 },
206};
207
208mdio_module_driver(ksz8863_driver);
209
210MODULE_AUTHOR("Michael Grzeschik <m.grzeschik@pengutronix.de>");
211MODULE_DESCRIPTION("Microchip KSZ8863 SMI Switch driver");
212MODULE_LICENSE("GPL v2");