drivers/net/dsa/microchip/ksz_spi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Microchip ksz series register access through SPI
   4  *
   5  * Copyright (C) 2017 Microchip Technology Inc.
   6  *      Tristram Ha <[email protected]>
   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 "ksz_common.h"
  18
  19 #define KSZ8795_SPI_ADDR_SHIFT                  12
  20 #define KSZ8795_SPI_ADDR_ALIGN                  3
  21 #define KSZ8795_SPI_TURNAROUND_SHIFT            1
  22
  23 #define KSZ8863_SPI_ADDR_SHIFT                  8
  24 #define KSZ8863_SPI_ADDR_ALIGN                  8
  25 #define KSZ8863_SPI_TURNAROUND_SHIFT            0
  26
  27 #define KSZ9477_SPI_ADDR_SHIFT                  24
  28 #define KSZ9477_SPI_ADDR_ALIGN                  3
  29 #define KSZ9477_SPI_TURNAROUND_SHIFT            5
  30
  31 KSZ_REGMAP_TABLE(ksz8795, 16, KSZ8795_SPI_ADDR_SHIFT,
  32                  KSZ8795_SPI_TURNAROUND_SHIFT, KSZ8795_SPI_ADDR_ALIGN);
  33
  34 KSZ_REGMAP_TABLE(ksz8863, 16, KSZ8863_SPI_ADDR_SHIFT,
  35                  KSZ8863_SPI_TURNAROUND_SHIFT, KSZ8863_SPI_ADDR_ALIGN);
  36
  37 KSZ_REGMAP_TABLE(ksz9477, 32, KSZ9477_SPI_ADDR_SHIFT,
  38                  KSZ9477_SPI_TURNAROUND_SHIFT, KSZ9477_SPI_ADDR_ALIGN);
  39
  40 static int ksz_spi_probe(struct spi_device *spi)
  41 {
  42         const struct regmap_config *regmap_config;
  43         const struct ksz_chip_data *chip;
  44         struct device *ddev = &spi->dev;
  45         struct regmap_config rc;
  46         struct ksz_device *dev;
  47         int i, ret = 0;
  48
  49         dev = ksz_switch_alloc(&spi->dev, spi);
  50         if (!dev)
  51                 return -ENOMEM;
  52
  53         chip = device_get_match_data(ddev);
  54         if (!chip)
  55                 return -EINVAL;
  56
  57         if (chip->chip_id == KSZ8830_CHIP_ID)
  58                 regmap_config = ksz8863_regmap_config;
  59         else if (chip->chip_id == KSZ8795_CHIP_ID ||
  60                  chip->chip_id == KSZ8794_CHIP_ID ||
  61                  chip->chip_id == KSZ8765_CHIP_ID)
  62                 regmap_config = ksz8795_regmap_config;
  63         else
  64                 regmap_config = ksz9477_regmap_config;
  65
  66         for (i = 0; i < ARRAY_SIZE(ksz8795_regmap_config); i++) {
  67                 rc = regmap_config[i];
  68                 rc.lock_arg = &dev->regmap_mutex;
  69                 dev->regmap[i] = devm_regmap_init_spi(spi, &rc);
  70                 if (IS_ERR(dev->regmap[i])) {
  71                         ret = PTR_ERR(dev->regmap[i]);
  72                         dev_err(&spi->dev,
  73                                 "Failed to initialize regmap%i: %d\n",
  74                                 regmap_config[i].val_bits, ret);
  75                         return ret;
  76                 }
  77         }
  78
  79         if (spi->dev.platform_data)
  80                 dev->pdata = spi->dev.platform_data;
  81
  82         /* setup spi */
  83         spi->mode = SPI_MODE_3;
  84         ret = spi_setup(spi);
  85         if (ret)
  86                 return ret;
  87
  88         ret = ksz_switch_register(dev);
  89
  90         /* Main DSA driver may not be started yet. */
  91         if (ret)
  92                 return ret;
  93
  94         spi_set_drvdata(spi, dev);
  95
  96         return 0;
  97 }
  98
  99 static void ksz_spi_remove(struct spi_device *spi)
 100 {
 101         struct ksz_device *dev = spi_get_drvdata(spi);
 102
 103         if (dev)
 104                 ksz_switch_remove(dev);
 105
 106         spi_set_drvdata(spi, NULL);
 107 }
 108
 109 static void ksz_spi_shutdown(struct spi_device *spi)
 110 {
 111         struct ksz_device *dev = spi_get_drvdata(spi);
 112
 113         if (!dev)
 114                 return;
 115
 116         if (dev->dev_ops->reset)
 117                 dev->dev_ops->reset(dev);
 118
 119         dsa_switch_shutdown(dev->ds);
 120
 121         spi_set_drvdata(spi, NULL);
 122 }
 123
 124 static const struct of_device_id ksz_dt_ids[] = {
 125         {
 126                 .compatible = "microchip,ksz8765",
 127                 .data = &ksz_switch_chips[KSZ8765]
 128         },
 129         {
 130                 .compatible = "microchip,ksz8794",
 131                 .data = &ksz_switch_chips[KSZ8794]
 132         },
 133         {
 134                 .compatible = "microchip,ksz8795",
 135                 .data = &ksz_switch_chips[KSZ8795]
 136         },
 137         {
 138                 .compatible = "microchip,ksz8863",
 139                 .data = &ksz_switch_chips[KSZ8830]
 140         },
 141         {
 142                 .compatible = "microchip,ksz8873",
 143                 .data = &ksz_switch_chips[KSZ8830]
 144         },
 145         {
 146                 .compatible = "microchip,ksz9477",
 147                 .data = &ksz_switch_chips[KSZ9477]
 148         },
 149         {
 150                 .compatible = "microchip,ksz9897",
 151                 .data = &ksz_switch_chips[KSZ9897]
 152         },
 153         {
 154                 .compatible = "microchip,ksz9893",
 155                 .data = &ksz_switch_chips[KSZ9893]
 156         },
 157         {
 158                 .compatible = "microchip,ksz9563",
 159                 .data = &ksz_switch_chips[KSZ9893]
 160         },
 161         {
 162                 .compatible = "microchip,ksz8563",
 163                 .data = &ksz_switch_chips[KSZ9893]
 164         },
 165         {
 166                 .compatible = "microchip,ksz9567",
 167                 .data = &ksz_switch_chips[KSZ9567]
 168         },
 169         {
 170                 .compatible = "microchip,lan9370",
 171                 .data = &ksz_switch_chips[LAN9370]
 172         },
 173         {
 174                 .compatible = "microchip,lan9371",
 175                 .data = &ksz_switch_chips[LAN9371]
 176         },
 177         {
 178                 .compatible = "microchip,lan9372",
 179                 .data = &ksz_switch_chips[LAN9372]
 180         },
 181         {
 182                 .compatible = "microchip,lan9373",
 183                 .data = &ksz_switch_chips[LAN9373]
 184         },
 185         {
 186                 .compatible = "microchip,lan9374",
 187                 .data = &ksz_switch_chips[LAN9374]
 188         },
 189         {},
 190 };
 191 MODULE_DEVICE_TABLE(of, ksz_dt_ids);
 192
 193 static const struct spi_device_id ksz_spi_ids[] = {
 194         { "ksz8765" },
 195         { "ksz8794" },
 196         { "ksz8795" },
 197         { "ksz8863" },
 198         { "ksz8873" },
 199         { "ksz9477" },
 200         { "ksz9897" },
 201         { "ksz9893" },
 202         { "ksz9563" },
 203         { "ksz8563" },
 204         { "ksz9567" },
 205         { "lan9370" },
 206         { "lan9371" },
 207         { "lan9372" },
 208         { "lan9373" },
 209         { "lan9374" },
 210         { },
 211 };
 212 MODULE_DEVICE_TABLE(spi, ksz_spi_ids);
 213
 214 static struct spi_driver ksz_spi_driver = {
 215         .driver = {
 216                 .name   = "ksz-switch",
 217                 .owner  = THIS_MODULE,
 218                 .of_match_table = ksz_dt_ids,
 219         },
 220         .id_table = ksz_spi_ids,
 221         .probe  = ksz_spi_probe,
 222         .remove = ksz_spi_remove,
 223         .shutdown = ksz_spi_shutdown,
 224 };
 225
 226 module_spi_driver(ksz_spi_driver);
 227
 228 MODULE_ALIAS("spi:ksz9477");
 229 MODULE_ALIAS("spi:ksz9897");
 230 MODULE_ALIAS("spi:ksz9893");
 231 MODULE_ALIAS("spi:ksz9563");
 232 MODULE_ALIAS("spi:ksz8563");
 233 MODULE_ALIAS("spi:ksz9567");
 234 MODULE_ALIAS("spi:lan937x");
 235 MODULE_AUTHOR("Tristram Ha <[email protected]>");
 236 MODULE_DESCRIPTION("Microchip ksz Series Switch SPI Driver");
 237 MODULE_LICENSE("GPL");