xref: /linux/drivers/net/dsa/microchip/ksz_spi.c (revision 249ebf3f65f8530beb2cbfb91bff1d83ba88d23c) 
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 
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 < __KSZ_NUM_REGMAPS; 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 			return dev_err_probe(&spi->dev, PTR_ERR(dev->regmap[i]),
75 					     "Failed to initialize regmap%i\n",
76 					     regmap_config[i].val_bits);
77 		}
78 	}
79 
80 	if (spi->dev.platform_data)
81 		dev->pdata = spi->dev.platform_data;
82 
83 	/* setup spi */
84 	spi->mode = SPI_MODE_3;
85 	ret = spi_setup(spi);
86 	if (ret)
87 		return ret;
88 
89 	dev->irq = spi->irq;
90 
91 	ret = ksz_switch_register(dev);
92 
93 	/* Main DSA driver may not be started yet. */
94 	if (ret)
95 		return ret;
96 
97 	spi_set_drvdata(spi, dev);
98 
99 	return 0;
100 }
101 
102 static void ksz_spi_remove(struct spi_device *spi)
103 {
104 	struct ksz_device *dev = spi_get_drvdata(spi);
105 
106 	if (dev)
107 		ksz_switch_remove(dev);
108 }
109 
110 static void ksz_spi_shutdown(struct spi_device *spi)
111 {
112 	struct ksz_device *dev = spi_get_drvdata(spi);
113 
114 	if (!dev)
115 		return;
116 
117 	ksz_switch_shutdown(dev);
118 
119 	spi_set_drvdata(spi, NULL);
120 }
121 
122 static const struct of_device_id ksz_dt_ids[] = {
123 	{
124 		.compatible = "microchip,ksz8765",
125 		.data = &ksz_switch_chips[KSZ8765]
126 	},
127 	{
128 		.compatible = "microchip,ksz8794",
129 		.data = &ksz_switch_chips[KSZ8794]
130 	},
131 	{
132 		.compatible = "microchip,ksz8795",
133 		.data = &ksz_switch_chips[KSZ8795]
134 	},
135 	{
136 		.compatible = "microchip,ksz8863",
137 		.data = &ksz_switch_chips[KSZ8830]
138 	},
139 	{
140 		.compatible = "microchip,ksz8873",
141 		.data = &ksz_switch_chips[KSZ8830]
142 	},
143 	{
144 		.compatible = "microchip,ksz9477",
145 		.data = &ksz_switch_chips[KSZ9477]
146 	},
147 	{
148 		.compatible = "microchip,ksz9896",
149 		.data = &ksz_switch_chips[KSZ9896]
150 	},
151 	{
152 		.compatible = "microchip,ksz9897",
153 		.data = &ksz_switch_chips[KSZ9897]
154 	},
155 	{
156 		.compatible = "microchip,ksz9893",
157 		.data = &ksz_switch_chips[KSZ9893]
158 	},
159 	{
160 		.compatible = "microchip,ksz9563",
161 		.data = &ksz_switch_chips[KSZ9563]
162 	},
163 	{
164 		.compatible = "microchip,ksz8563",
165 		.data = &ksz_switch_chips[KSZ8563]
166 	},
167 	{
168 		.compatible = "microchip,ksz8567",
169 		.data = &ksz_switch_chips[KSZ8567]
170 	},
171 	{
172 		.compatible = "microchip,ksz9567",
173 		.data = &ksz_switch_chips[KSZ9567]
174 	},
175 	{
176 		.compatible = "microchip,lan9370",
177 		.data = &ksz_switch_chips[LAN9370]
178 	},
179 	{
180 		.compatible = "microchip,lan9371",
181 		.data = &ksz_switch_chips[LAN9371]
182 	},
183 	{
184 		.compatible = "microchip,lan9372",
185 		.data = &ksz_switch_chips[LAN9372]
186 	},
187 	{
188 		.compatible = "microchip,lan9373",
189 		.data = &ksz_switch_chips[LAN9373]
190 	},
191 	{
192 		.compatible = "microchip,lan9374",
193 		.data = &ksz_switch_chips[LAN9374]
194 	},
195 	{},
196 };
197 MODULE_DEVICE_TABLE(of, ksz_dt_ids);
198 
199 static const struct spi_device_id ksz_spi_ids[] = {
200 	{ "ksz8765" },
201 	{ "ksz8794" },
202 	{ "ksz8795" },
203 	{ "ksz8863" },
204 	{ "ksz8873" },
205 	{ "ksz9477" },
206 	{ "ksz9896" },
207 	{ "ksz9897" },
208 	{ "ksz9893" },
209 	{ "ksz9563" },
210 	{ "ksz8563" },
211 	{ "ksz8567" },
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 		.of_match_table = ksz_dt_ids,
226 	},
227 	.id_table = ksz_spi_ids,
228 	.probe	= ksz_spi_probe,
229 	.remove	= ksz_spi_remove,
230 	.shutdown = ksz_spi_shutdown,
231 };
232 
233 module_spi_driver(ksz_spi_driver);
234 
235 MODULE_ALIAS("spi:lan937x");
236 MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
237 MODULE_DESCRIPTION("Microchip ksz Series Switch SPI Driver");
238 MODULE_LICENSE("GPL");
239