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_common.h"
  17
  18 #define SPI_ADDR_SHIFT                  24
  19 #define SPI_ADDR_ALIGN                  3
  20 #define SPI_TURNAROUND_SHIFT            5
  21
  22 KSZ_REGMAP_TABLE(ksz9477, 32, SPI_ADDR_SHIFT,
  23                  SPI_TURNAROUND_SHIFT, SPI_ADDR_ALIGN);
  24
  25 static 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
  68 static 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
  78 static 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
  88 static const struct of_device_id ksz9477_dt_ids[] = {
  89         { .compatible = "microchip,ksz9477" },
  90         { .compatible = "microchip,ksz9897" },
  91         { .compatible = "microchip,ksz9893" },
  92         { .compatible = "microchip,ksz9563" },
  93         { .compatible = "microchip,ksz8563" },
  94         { .compatible = "microchip,ksz9567" },
  95         {},
  96 };
  97 MODULE_DEVICE_TABLE(of, ksz9477_dt_ids);
  98
  99 static const struct spi_device_id ksz9477_spi_ids[] = {
 100         { "ksz9477" },
 101         { "ksz9897" },
 102         { "ksz9893" },
 103         { "ksz9563" },
 104         { "ksz8563" },
 105         { "ksz9567" },
 106         { },
 107 };
 108 MODULE_DEVICE_TABLE(spi, ksz9477_spi_ids);
 109
 110 static struct spi_driver ksz9477_spi_driver = {
 111         .driver = {
 112                 .name   = "ksz9477-switch",
 113                 .owner  = THIS_MODULE,
 114                 .of_match_table = of_match_ptr(ksz9477_dt_ids),
 115         },
 116         .id_table = ksz9477_spi_ids,
 117         .probe  = ksz9477_spi_probe,
 118         .remove = ksz9477_spi_remove,
 119         .shutdown = ksz9477_spi_shutdown,
 120 };
 121
 122 module_spi_driver(ksz9477_spi_driver);
 123
 124 MODULE_ALIAS("spi:ksz9477");
 125 MODULE_ALIAS("spi:ksz9897");
 126 MODULE_ALIAS("spi:ksz9893");
 127 MODULE_ALIAS("spi:ksz9563");
 128 MODULE_ALIAS("spi:ksz8563");
 129 MODULE_ALIAS("spi:ksz9567");
 130 MODULE_AUTHOR("Woojung Huh <Woojung.Huh@microchip.com>");
 131 MODULE_DESCRIPTION("Microchip KSZ9477 Series Switch SPI access Driver");
 132 MODULE_LICENSE("GPL");