drivers/net/dsa/microchip/ksz8795_spi.c

   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 "ksz8.h"
  18 #include "ksz_common.h"
  19
  20 #define KSZ8795_SPI_ADDR_SHIFT                  12
  21 #define KSZ8795_SPI_ADDR_ALIGN                  3
  22 #define KSZ8795_SPI_TURNAROUND_SHIFT            1
  23
  24 #define KSZ8863_SPI_ADDR_SHIFT                  8
  25 #define KSZ8863_SPI_ADDR_ALIGN                  8
  26 #define KSZ8863_SPI_TURNAROUND_SHIFT            0
  27
  28 KSZ_REGMAP_TABLE(ksz8795, 16, KSZ8795_SPI_ADDR_SHIFT,
  29                  KSZ8795_SPI_TURNAROUND_SHIFT, KSZ8795_SPI_ADDR_ALIGN);
  30
  31 KSZ_REGMAP_TABLE(ksz8863, 16, KSZ8863_SPI_ADDR_SHIFT,
  32                  KSZ8863_SPI_TURNAROUND_SHIFT, KSZ8863_SPI_ADDR_ALIGN);
  33
  34 static int ksz8795_spi_probe(struct spi_device *spi)
  35 {
  36         const struct regmap_config *regmap_config;
  37         struct device *ddev = &spi->dev;
  38         struct regmap_config rc;
  39         struct ksz_device *dev;
  40         struct ksz8 *ksz8;
  41         int i, ret = 0;
  42
  43         ksz8 = devm_kzalloc(&spi->dev, sizeof(struct ksz8), GFP_KERNEL);
  44         if (!ksz8)
  45                 return -ENOMEM;
  46
  47         ksz8->priv = spi;
  48
  49         dev = ksz_switch_alloc(&spi->dev, ksz8);
  50         if (!dev)
  51                 return -ENOMEM;
  52
  53         regmap_config = device_get_match_data(ddev);
  54         if (!regmap_config)
  55                 return -EINVAL;
  56
  57         for (i = 0; i < ARRAY_SIZE(ksz8795_regmap_config); i++) {
  58                 rc = regmap_config[i];
  59                 rc.lock_arg = &dev->regmap_mutex;
  60                 dev->regmap[i] = devm_regmap_init_spi(spi, &rc);
  61                 if (IS_ERR(dev->regmap[i])) {
  62                         ret = PTR_ERR(dev->regmap[i]);
  63                         dev_err(&spi->dev,
  64                                 "Failed to initialize regmap%i: %d\n",
  65                                 regmap_config[i].val_bits, ret);
  66                         return ret;
  67                 }
  68         }
  69
  70         if (spi->dev.platform_data)
  71                 dev->pdata = spi->dev.platform_data;
  72
  73         /* setup spi */
  74         spi->mode = SPI_MODE_3;
  75         ret = spi_setup(spi);
  76         if (ret)
  77                 return ret;
  78
  79         ret = ksz8_switch_register(dev);
  80
  81         /* Main DSA driver may not be started yet. */
  82         if (ret)
  83                 return ret;
  84
  85         spi_set_drvdata(spi, dev);
  86
  87         return 0;
  88 }
  89
  90 static int ksz8795_spi_remove(struct spi_device *spi)
  91 {
  92         struct ksz_device *dev = spi_get_drvdata(spi);
  93
  94         if (dev)
  95                 ksz_switch_remove(dev);
  96
  97         spi_set_drvdata(spi, NULL);
  98
  99         return 0;
 100 }
 101
 102 static void ksz8795_spi_shutdown(struct spi_device *spi)
 103 {
 104         struct ksz_device *dev = spi_get_drvdata(spi);
 105
 106         if (!dev)
 107                 return;
 108
 109         if (dev->dev_ops->shutdown)
 110                 dev->dev_ops->shutdown(dev);
 111
 112         dsa_switch_shutdown(dev->ds);
 113
 114         spi_set_drvdata(spi, NULL);
 115 }
 116
 117 static const struct of_device_id ksz8795_dt_ids[] = {
 118         { .compatible = "microchip,ksz8765", .data = &ksz8795_regmap_config },
 119         { .compatible = "microchip,ksz8794", .data = &ksz8795_regmap_config },
 120         { .compatible = "microchip,ksz8795", .data = &ksz8795_regmap_config },
 121         { .compatible = "microchip,ksz8863", .data = &ksz8863_regmap_config },
 122         { .compatible = "microchip,ksz8873", .data = &ksz8863_regmap_config },
 123         {},
 124 };
 125 MODULE_DEVICE_TABLE(of, ksz8795_dt_ids);
 126
 127 static struct spi_driver ksz8795_spi_driver = {
 128         .driver = {
 129                 .name   = "ksz8795-switch",
 130                 .owner  = THIS_MODULE,
 131                 .of_match_table = of_match_ptr(ksz8795_dt_ids),
 132         },
 133         .probe  = ksz8795_spi_probe,
 134         .remove = ksz8795_spi_remove,
 135         .shutdown = ksz8795_spi_shutdown,
 136 };
 137
 138 module_spi_driver(ksz8795_spi_driver);
 139
 140 MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
 141 MODULE_DESCRIPTION("Microchip KSZ8795 Series Switch SPI Driver");
 142 MODULE_LICENSE("GPL");