1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Microchip ksz series register access through SPI
4 *
5 * Copyright (C) 2017 Microchip Technology Inc.
6 * Tristram Ha <Tristram.Ha@microchip.com>
7 */
8
9 #include <asm/unaligned.h>
10
11 #include <linux/delay.h>
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/regmap.h>
15 #include <linux/spi/spi.h>
16
17 #include "ksz_common.h"
18
19 #define KSZ8795_SPI_ADDR_SHIFT 12
20 #define KSZ8795_SPI_ADDR_ALIGN 3
21 #define KSZ8795_SPI_TURNAROUND_SHIFT 1
22
23 #define KSZ8863_SPI_ADDR_SHIFT 8
24 #define KSZ8863_SPI_ADDR_ALIGN 8
25 #define KSZ8863_SPI_TURNAROUND_SHIFT 0
26
27 #define KSZ9477_SPI_ADDR_SHIFT 24
28 #define KSZ9477_SPI_ADDR_ALIGN 3
29 #define KSZ9477_SPI_TURNAROUND_SHIFT 5
30
31 KSZ_REGMAP_TABLE(ksz8795, 16, KSZ8795_SPI_ADDR_SHIFT,
32 KSZ8795_SPI_TURNAROUND_SHIFT, KSZ8795_SPI_ADDR_ALIGN);
33
34 KSZ_REGMAP_TABLE(ksz8863, 16, KSZ8863_SPI_ADDR_SHIFT,
35 KSZ8863_SPI_TURNAROUND_SHIFT, KSZ8863_SPI_ADDR_ALIGN);
36
37 KSZ_REGMAP_TABLE(ksz9477, 32, KSZ9477_SPI_ADDR_SHIFT,
38 KSZ9477_SPI_TURNAROUND_SHIFT, KSZ9477_SPI_ADDR_ALIGN);
39
ksz_spi_probe(struct spi_device * spi)40 static int ksz_spi_probe(struct spi_device *spi)
41 {
42 const struct regmap_config *regmap_config;
43 const struct ksz_chip_data *chip;
44 struct device *ddev = &spi->dev;
45 struct regmap_config rc;
46 struct ksz_device *dev;
47 int i, ret = 0;
48
49 dev = ksz_switch_alloc(&spi->dev, spi);
50 if (!dev)
51 return -ENOMEM;
52
53 chip = device_get_match_data(ddev);
54 if (!chip)
55 return -EINVAL;
56
57 if (chip->chip_id == KSZ8830_CHIP_ID)
58 regmap_config = ksz8863_regmap_config;
59 else if (chip->chip_id == KSZ8795_CHIP_ID ||
60 chip->chip_id == KSZ8794_CHIP_ID ||
61 chip->chip_id == KSZ8765_CHIP_ID)
62 regmap_config = ksz8795_regmap_config;
63 else
64 regmap_config = ksz9477_regmap_config;
65
66 for (i = 0; i < ARRAY_SIZE(ksz8795_regmap_config); i++) {
67 rc = regmap_config[i];
68 rc.lock_arg = &dev->regmap_mutex;
69 rc.wr_table = chip->wr_table;
70 rc.rd_table = chip->rd_table;
71 dev->regmap[i] = devm_regmap_init_spi(spi, &rc);
72
73 if (IS_ERR(dev->regmap[i])) {
74 ret = PTR_ERR(dev->regmap[i]);
75 dev_err(&spi->dev,
76 "Failed to initialize regmap%i: %d\n",
77 regmap_config[i].val_bits, ret);
78 return ret;
79 }
80 }
81
82 if (spi->dev.platform_data)
83 dev->pdata = spi->dev.platform_data;
84
85 /* setup spi */
86 spi->mode = SPI_MODE_3;
87 ret = spi_setup(spi);
88 if (ret)
89 return ret;
90
91 dev->irq = spi->irq;
92
93 ret = ksz_switch_register(dev);
94
95 /* Main DSA driver may not be started yet. */
96 if (ret)
97 return ret;
98
99 spi_set_drvdata(spi, dev);
100
101 return 0;
102 }
103
ksz_spi_remove(struct spi_device * spi)104 static void ksz_spi_remove(struct spi_device *spi)
105 {
106 struct ksz_device *dev = spi_get_drvdata(spi);
107
108 if (dev)
109 ksz_switch_remove(dev);
110 }
111
ksz_spi_shutdown(struct spi_device * spi)112 static void ksz_spi_shutdown(struct spi_device *spi)
113 {
114 struct ksz_device *dev = spi_get_drvdata(spi);
115
116 if (!dev)
117 return;
118
119 if (dev->dev_ops->reset)
120 dev->dev_ops->reset(dev);
121
122 dsa_switch_shutdown(dev->ds);
123
124 spi_set_drvdata(spi, NULL);
125 }
126
127 static const struct of_device_id ksz_dt_ids[] = {
128 {
129 .compatible = "microchip,ksz8765",
130 .data = &ksz_switch_chips[KSZ8765]
131 },
132 {
133 .compatible = "microchip,ksz8794",
134 .data = &ksz_switch_chips[KSZ8794]
135 },
136 {
137 .compatible = "microchip,ksz8795",
138 .data = &ksz_switch_chips[KSZ8795]
139 },
140 {
141 .compatible = "microchip,ksz8863",
142 .data = &ksz_switch_chips[KSZ8830]
143 },
144 {
145 .compatible = "microchip,ksz8873",
146 .data = &ksz_switch_chips[KSZ8830]
147 },
148 {
149 .compatible = "microchip,ksz9477",
150 .data = &ksz_switch_chips[KSZ9477]
151 },
152 {
153 .compatible = "microchip,ksz9896",
154 .data = &ksz_switch_chips[KSZ9896]
155 },
156 {
157 .compatible = "microchip,ksz9897",
158 .data = &ksz_switch_chips[KSZ9897]
159 },
160 {
161 .compatible = "microchip,ksz9893",
162 .data = &ksz_switch_chips[KSZ9893]
163 },
164 {
165 .compatible = "microchip,ksz9563",
166 .data = &ksz_switch_chips[KSZ9893]
167 },
168 {
169 .compatible = "microchip,ksz8563",
170 .data = &ksz_switch_chips[KSZ8563]
171 },
172 {
173 .compatible = "microchip,ksz9567",
174 .data = &ksz_switch_chips[KSZ9567]
175 },
176 {
177 .compatible = "microchip,lan9370",
178 .data = &ksz_switch_chips[LAN9370]
179 },
180 {
181 .compatible = "microchip,lan9371",
182 .data = &ksz_switch_chips[LAN9371]
183 },
184 {
185 .compatible = "microchip,lan9372",
186 .data = &ksz_switch_chips[LAN9372]
187 },
188 {
189 .compatible = "microchip,lan9373",
190 .data = &ksz_switch_chips[LAN9373]
191 },
192 {
193 .compatible = "microchip,lan9374",
194 .data = &ksz_switch_chips[LAN9374]
195 },
196 {},
197 };
198 MODULE_DEVICE_TABLE(of, ksz_dt_ids);
199
200 static const struct spi_device_id ksz_spi_ids[] = {
201 { "ksz8765" },
202 { "ksz8794" },
203 { "ksz8795" },
204 { "ksz8863" },
205 { "ksz8873" },
206 { "ksz9477" },
207 { "ksz9896" },
208 { "ksz9897" },
209 { "ksz9893" },
210 { "ksz9563" },
211 { "ksz8563" },
212 { "ksz9567" },
213 { "lan9370" },
214 { "lan9371" },
215 { "lan9372" },
216 { "lan9373" },
217 { "lan9374" },
218 { },
219 };
220 MODULE_DEVICE_TABLE(spi, ksz_spi_ids);
221
222 static struct spi_driver ksz_spi_driver = {
223 .driver = {
224 .name = "ksz-switch",
225 .owner = THIS_MODULE,
226 .of_match_table = ksz_dt_ids,
227 },
228 .id_table = ksz_spi_ids,
229 .probe = ksz_spi_probe,
230 .remove = ksz_spi_remove,
231 .shutdown = ksz_spi_shutdown,
232 };
233
234 module_spi_driver(ksz_spi_driver);
235
236 MODULE_ALIAS("spi:ksz9477");
237 MODULE_ALIAS("spi:ksz9896");
238 MODULE_ALIAS("spi:ksz9897");
239 MODULE_ALIAS("spi:ksz9893");
240 MODULE_ALIAS("spi:ksz9563");
241 MODULE_ALIAS("spi:ksz8563");
242 MODULE_ALIAS("spi:ksz9567");
243 MODULE_ALIAS("spi:lan937x");
244 MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
245 MODULE_DESCRIPTION("Microchip ksz Series Switch SPI Driver");
246 MODULE_LICENSE("GPL");
247