1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Microchip KSZ9477 series register access through SPI
4 *
5 * Copyright (C) 2017-2019 Microchip Technology Inc.
6 */
7
8#include <asm/unaligned.h>
9
10#include <linux/delay.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/regmap.h>
14#include <linux/spi/spi.h>
15
16#include "ksz_common.h"
17
18#define SPI_ADDR_SHIFT			24
19#define SPI_ADDR_ALIGN			3
20#define SPI_TURNAROUND_SHIFT		5
21
22KSZ_REGMAP_TABLE(ksz9477, 32, SPI_ADDR_SHIFT,
23		 SPI_TURNAROUND_SHIFT, SPI_ADDR_ALIGN);
24
25static int ksz9477_spi_probe(struct spi_device *spi)
26{
27	struct regmap_config rc;
28	struct ksz_device *dev;
29	int i, ret;
30
31	dev = ksz_switch_alloc(&spi->dev, spi);
32	if (!dev)
33		return -ENOMEM;
34
35	for (i = 0; i < ARRAY_SIZE(ksz9477_regmap_config); i++) {
36		rc = ksz9477_regmap_config[i];
37		rc.lock_arg = &dev->regmap_mutex;
38		dev->regmap[i] = devm_regmap_init_spi(spi, &rc);
39		if (IS_ERR(dev->regmap[i])) {
40			ret = PTR_ERR(dev->regmap[i]);
41			dev_err(&spi->dev,
42				"Failed to initialize regmap%i: %d\n",
43				ksz9477_regmap_config[i].val_bits, ret);
44			return ret;
45		}
46	}
47
48	if (spi->dev.platform_data)
49		dev->pdata = spi->dev.platform_data;
50
51	ret = ksz9477_switch_register(dev);
52
53	/* Main DSA driver may not be started yet. */
54	if (ret)
55		return ret;
56
57	spi_set_drvdata(spi, dev);
58
59	return 0;
60}
61
62static int ksz9477_spi_remove(struct spi_device *spi)
63{
64	struct ksz_device *dev = spi_get_drvdata(spi);
65
66	if (dev)
67		ksz_switch_remove(dev);
68
69	return 0;
70}
71
72static void ksz9477_spi_shutdown(struct spi_device *spi)
73{
74	struct ksz_device *dev = spi_get_drvdata(spi);
75
76	if (dev && dev->dev_ops->shutdown)
77		dev->dev_ops->shutdown(dev);
78}
79
80static const struct of_device_id ksz9477_dt_ids[] = {
81	{ .compatible = "microchip,ksz9477" },
82	{ .compatible = "microchip,ksz9897" },
83	{ .compatible = "microchip,ksz9893" },
84	{ .compatible = "microchip,ksz9563" },
85	{ .compatible = "microchip,ksz8563" },
86	{ .compatible = "microchip,ksz9567" },
87	{},
88};
89MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
90
91static const struct spi_device_id ksz9477_spi_ids[] = {
92	{ "ksz9477" },
93	{ "ksz9897" },
94	{ "ksz9893" },
95	{ "ksz9563" },
96	{ "ksz8563" },
97	{ "ksz9567" },
98	{ },
99};
100MODULE_DEVICE_TABLE(spi, ksz9477_spi_ids);
101
102static struct spi_driver ksz9477_spi_driver = {
103	.driver = {
104		.name	= "ksz9477-switch",
105		.owner	= THIS_MODULE,
106		.of_match_table = of_match_ptr(ksz9477_dt_ids),
107	},
108	.id_table = ksz9477_spi_ids,
109	.probe	= ksz9477_spi_probe,
110	.remove	= ksz9477_spi_remove,
111	.shutdown = ksz9477_spi_shutdown,
112};
113
114module_spi_driver(ksz9477_spi_driver);
115
116MODULE_ALIAS("spi:ksz9477");
117MODULE_ALIAS("spi:ksz9897");
118MODULE_ALIAS("spi:ksz9893");
119MODULE_ALIAS("spi:ksz9563");
120MODULE_ALIAS("spi:ksz8563");
121MODULE_ALIAS("spi:ksz9567");
122MODULE_AUTHOR("Woojung Huh <Woojung.Huh@microchip.com>");
123MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch SPI access Driver");
124MODULE_LICENSE("GPL");
125