1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Microchip KSZ8795 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 SPI_ADDR_SHIFT			12
20#define SPI_ADDR_ALIGN			3
21#define SPI_TURNAROUND_SHIFT		1
22
23KSZ_REGMAP_TABLE(ksz8795, 16, SPI_ADDR_SHIFT,
24		 SPI_TURNAROUND_SHIFT, SPI_ADDR_ALIGN);
25
26static int ksz8795_spi_probe(struct spi_device *spi)
27{
28	struct regmap_config rc;
29	struct ksz_device *dev;
30	int i, ret;
31
32	dev = ksz_switch_alloc(&spi->dev, spi);
33	if (!dev)
34		return -ENOMEM;
35
36	for (i = 0; i < ARRAY_SIZE(ksz8795_regmap_config); i++) {
37		rc = ksz8795_regmap_config[i];
38		rc.lock_arg = &dev->regmap_mutex;
39		dev->regmap[i] = devm_regmap_init_spi(spi, &rc);
40		if (IS_ERR(dev->regmap[i])) {
41			ret = PTR_ERR(dev->regmap[i]);
42			dev_err(&spi->dev,
43				"Failed to initialize regmap%i: %d\n",
44				ksz8795_regmap_config[i].val_bits, ret);
45			return ret;
46		}
47	}
48
49	if (spi->dev.platform_data)
50		dev->pdata = spi->dev.platform_data;
51
52	ret = ksz8795_switch_register(dev);
53
54	/* Main DSA driver may not be started yet. */
55	if (ret)
56		return ret;
57
58	spi_set_drvdata(spi, dev);
59
60	return 0;
61}
62
63static int ksz8795_spi_remove(struct spi_device *spi)
64{
65	struct ksz_device *dev = spi_get_drvdata(spi);
66
67	if (dev)
68		ksz_switch_remove(dev);
69
70	return 0;
71}
72
73static void ksz8795_spi_shutdown(struct spi_device *spi)
74{
75	struct ksz_device *dev = spi_get_drvdata(spi);
76
77	if (dev && dev->dev_ops->shutdown)
78		dev->dev_ops->shutdown(dev);
79}
80
81static const struct of_device_id ksz8795_dt_ids[] = {
82	{ .compatible = "microchip,ksz8765" },
83	{ .compatible = "microchip,ksz8794" },
84	{ .compatible = "microchip,ksz8795" },
85	{},
86};
87MODULE_DEVICE_TABLE(of, ksz8795_dt_ids);
88
89static const struct spi_device_id ksz8795_spi_ids[] = {
90	{ "ksz8765" },
91	{ "ksz8794" },
92	{ "ksz8795" },
93	{ "ksz8863" },
94	{ "ksz8873" },
95	{ },
96};
97MODULE_DEVICE_TABLE(spi, ksz8795_spi_ids);
98
99static struct spi_driver ksz8795_spi_driver = {
100	.driver = {
101		.name	= "ksz8795-switch",
102		.owner	= THIS_MODULE,
103		.of_match_table = of_match_ptr(ksz8795_dt_ids),
104	},
105	.id_table = ksz8795_spi_ids,
106	.probe	= ksz8795_spi_probe,
107	.remove	= ksz8795_spi_remove,
108	.shutdown = ksz8795_spi_shutdown,
109};
110
111module_spi_driver(ksz8795_spi_driver);
112
113MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
114MODULE_DESCRIPTION("Microchip KSZ8795 Series Switch SPI Driver");
115MODULE_LICENSE("GPL");
116