drivers/net/dsa/microchip/ksz9477_spi.c

   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_priv.h"
  17 #include "ksz_common.h"
  18
  19 #define SPI_ADDR_SHIFT                  24
  20 #define SPI_ADDR_ALIGN                  3
  21 #define SPI_TURNAROUND_SHIFT            5
  22
  23 KSZ_REGMAP_TABLE(ksz9477, 32, SPI_ADDR_SHIFT,
  24                  SPI_TURNAROUND_SHIFT, SPI_ADDR_ALIGN);
  25
  26 static int ksz9477_spi_probe(struct spi_device *spi)
  27 {
  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                 dev->regmap[i] = devm_regmap_init_spi(spi,
  37                                         &ksz9477_regmap_config[i]);
  38                 if (IS_ERR(dev->regmap[i])) {
  39                         ret = PTR_ERR(dev->regmap[i]);
  40                         dev_err(&spi->dev,
  41                                 "Failed to initialize regmap%i: %d\n",
  42                                 ksz9477_regmap_config[i].val_bits, ret);
  43                         return ret;
  44                 }
  45         }
  46
  47         if (spi->dev.platform_data)
  48                 dev->pdata = spi->dev.platform_data;
  49
  50         ret = ksz9477_switch_register(dev);
  51
  52         /* Main DSA driver may not be started yet. */
  53         if (ret)
  54                 return ret;
  55
  56         spi_set_drvdata(spi, dev);
  57
  58         return 0;
  59 }
  60
  61 static int ksz9477_spi_remove(struct spi_device *spi)
  62 {
  63         struct ksz_device *dev = spi_get_drvdata(spi);
  64
  65         if (dev)
  66                 ksz_switch_remove(dev);
  67
  68         return 0;
  69 }
  70
  71 static void ksz9477_spi_shutdown(struct spi_device *spi)
  72 {
  73         struct ksz_device *dev = spi_get_drvdata(spi);
  74
  75         if (dev && dev->dev_ops->shutdown)
  76                 dev->dev_ops->shutdown(dev);
  77 }
  78
  79 static const struct of_device_id ksz9477_dt_ids[] = {
  80         { .compatible = "microchip,ksz9477" },
  81         { .compatible = "microchip,ksz9897" },
  82         { .compatible = "microchip,ksz9893" },
  83         { .compatible = "microchip,ksz9563" },
  84         { .compatible = "microchip,ksz8563" },
  85         {},
  86 };
  87 MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
  88
  89 static struct spi_driver ksz9477_spi_driver = {
  90         .driver = {
  91                 .name   = "ksz9477-switch",
  92                 .owner  = THIS_MODULE,
  93                 .of_match_table = of_match_ptr(ksz9477_dt_ids),
  94         },
  95         .probe  = ksz9477_spi_probe,
  96         .remove = ksz9477_spi_remove,
  97         .shutdown = ksz9477_spi_shutdown,
  98 };
  99
 100 module_spi_driver(ksz9477_spi_driver);
 101
 102 MODULE_AUTHOR("Woojung Huh <Woojung.Huh@microchip.com>");
 103 MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch SPI access Driver");
 104 MODULE_LICENSE("GPL");