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	/* setup spi */
 52	spi->mode = SPI_MODE_3;
 53	ret = spi_setup(spi);
 54	if (ret)
 55		return ret;
 56
 57	ret = ksz9477_switch_register(dev);
 58
 59	/* Main DSA driver may not be started yet. */
 60	if (ret)
 61		return ret;
 62
 63	spi_set_drvdata(spi, dev);
 64
 65	return 0;
 66}
 67
 68static int ksz9477_spi_remove(struct spi_device *spi)
 69{
 70	struct ksz_device *dev = spi_get_drvdata(spi);
 71
 72	if (dev)
 73		ksz_switch_remove(dev);
 74
 75	return 0;
 76}
 77
 78static void ksz9477_spi_shutdown(struct spi_device *spi)
 79{
 80	struct ksz_device *dev = spi_get_drvdata(spi);
 81
 82	if (dev && dev->dev_ops->shutdown)
 83		dev->dev_ops->shutdown(dev);
 84}
 85
 86static const struct of_device_id ksz9477_dt_ids[] = {
 87	{ .compatible = "microchip,ksz9477" },
 88	{ .compatible = "microchip,ksz9897" },
 89	{ .compatible = "microchip,ksz9893" },
 90	{ .compatible = "microchip,ksz9563" },
 91	{ .compatible = "microchip,ksz8563" },
 92	{ .compatible = "microchip,ksz9567" },
 93	{},
 94};
 95MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
 96
 97static struct spi_driver ksz9477_spi_driver = {
 98	.driver = {
 99		.name	= "ksz9477-switch",
100		.owner	= THIS_MODULE,
101		.of_match_table = of_match_ptr(ksz9477_dt_ids),
102	},
103	.probe	= ksz9477_spi_probe,
104	.remove	= ksz9477_spi_remove,
105	.shutdown = ksz9477_spi_shutdown,
106};
107
108module_spi_driver(ksz9477_spi_driver);
109
110MODULE_ALIAS("spi:ksz9477");
111MODULE_ALIAS("spi:ksz9897");
112MODULE_ALIAS("spi:ksz9893");
113MODULE_ALIAS("spi:ksz9563");
114MODULE_ALIAS("spi:ksz8563");
115MODULE_ALIAS("spi:ksz9567");
116MODULE_AUTHOR("Woojung Huh <Woojung.Huh@microchip.com>");
117MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch SPI access Driver");
118MODULE_LICENSE("GPL");