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 struct spi_driver ksz8795_spi_driver = {
 90	.driver = {
 91		.name	= "ksz8795-switch",
 92		.owner	= THIS_MODULE,
 93		.of_match_table = of_match_ptr(ksz8795_dt_ids),
 94	},
 95	.probe	= ksz8795_spi_probe,
 96	.remove	= ksz8795_spi_remove,
 97	.shutdown = ksz8795_spi_shutdown,
 98};
 99
100module_spi_driver(ksz8795_spi_driver);
101
102MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
103MODULE_DESCRIPTION("Microchip KSZ8795 Series Switch SPI Driver");
104MODULE_LICENSE("GPL");