cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ksz9477_spi.c (3215B)

      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 void 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	spi_set_drvdata(spi, NULL);
     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)
     83		dsa_switch_shutdown(dev->ds);
     84
     85	spi_set_drvdata(spi, NULL);
     86}
     87
     88static const struct of_device_id ksz9477_dt_ids[] = {
     89	{
     90		.compatible = "microchip,ksz9477",
     91		.data = &ksz_switch_chips[KSZ9477]
     92	},
     93	{
     94		.compatible = "microchip,ksz9897",
     95		.data = &ksz_switch_chips[KSZ9897]
     96	},
     97	{
     98		.compatible = "microchip,ksz9893",
     99		.data = &ksz_switch_chips[KSZ9893]
    100	},
    101	{
    102		.compatible = "microchip,ksz9563",
    103		.data = &ksz_switch_chips[KSZ9893]
    104	},
    105	{
    106		.compatible = "microchip,ksz8563",
    107		.data = &ksz_switch_chips[KSZ9893]
    108	},
    109	{
    110		.compatible = "microchip,ksz9567",
    111		.data = &ksz_switch_chips[KSZ9567]
    112	},
    113	{},
    114};
    115MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
    116
    117static const struct spi_device_id ksz9477_spi_ids[] = {
    118	{ "ksz9477" },
    119	{ "ksz9897" },
    120	{ "ksz9893" },
    121	{ "ksz9563" },
    122	{ "ksz8563" },
    123	{ "ksz9567" },
    124	{ },
    125};
    126MODULE_DEVICE_TABLE(spi, ksz9477_spi_ids);
    127
    128static struct spi_driver ksz9477_spi_driver = {
    129	.driver = {
    130		.name	= "ksz9477-switch",
    131		.owner	= THIS_MODULE,
    132		.of_match_table = of_match_ptr(ksz9477_dt_ids),
    133	},
    134	.id_table = ksz9477_spi_ids,
    135	.probe	= ksz9477_spi_probe,
    136	.remove	= ksz9477_spi_remove,
    137	.shutdown = ksz9477_spi_shutdown,
    138};
    139
    140module_spi_driver(ksz9477_spi_driver);
    141
    142MODULE_ALIAS("spi:ksz9477");
    143MODULE_ALIAS("spi:ksz9897");
    144MODULE_ALIAS("spi:ksz9893");
    145MODULE_ALIAS("spi:ksz9563");
    146MODULE_ALIAS("spi:ksz8563");
    147MODULE_ALIAS("spi:ksz9567");
    148MODULE_AUTHOR("Woojung Huh <Woojung.Huh@microchip.com>");
    149MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch SPI access Driver");
    150MODULE_LICENSE("GPL");