LXR linux/drivers/net/dsa/microchip/ksz9477

   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        spi_set_drvdata(spi, NULL);
  76
  77        return 0;
  78}
  79
  80static void ksz9477_spi_shutdown(struct spi_device *spi)
  81{
  82        struct ksz_device *dev = spi_get_drvdata(spi);
  83
  84        if (dev)
  85                dsa_switch_shutdown(dev->ds);
  86
  87        spi_set_drvdata(spi, NULL);
  88}
  89
  90static const struct of_device_id ksz9477_dt_ids[] = {
  91        { .compatible = "microchip,ksz9477" },
  92        { .compatible = "microchip,ksz9897" },
  93        { .compatible = "microchip,ksz9893" },
  94        { .compatible = "microchip,ksz9563" },
  95        { .compatible = "microchip,ksz8563" },
  96        { .compatible = "microchip,ksz9567" },
  97        {},
  98};
  99MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
 100
 101static struct spi_driver ksz9477_spi_driver = {
 102        .driver = {
 103                .name   = "ksz9477-switch",
 104                .owner  = THIS_MODULE,
 105                .of_match_table = of_match_ptr(ksz9477_dt_ids),
 106        },
 107        .probe  = ksz9477_spi_probe,
 108        .remove = ksz9477_spi_remove,
 109        .shutdown = ksz9477_spi_shutdown,
 110};
 111
 112module_spi_driver(ksz9477_spi_driver);
 113
 114MODULE_ALIAS("spi:ksz9477");
 115MODULE_ALIAS("spi:ksz9897");
 116MODULE_ALIAS("spi:ksz9893");
 117MODULE_ALIAS("spi:ksz9563");
 118MODULE_ALIAS("spi:ksz8563");
 119MODULE_ALIAS("spi:ksz9567");
 120MODULE_AUTHOR("Woojung Huh <Woojung.Huh@microchip.com>");
 121MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch SPI access Driver");
 122MODULE_LICENSE("GPL");
 123