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 <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 "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 < __KSZ_NUM_REGMAPS; i++) {
  67                 rc = regmap_config[i];
  68                 rc.lock_arg = &dev->regmap_mutex;
  69                 rc.wr_table = chip->wr_table;
  70                 rc.rd_table = chip->rd_table;
  71                 dev->regmap[i] = devm_regmap_init_spi(spi, &rc);
  72
  73                 if (IS_ERR(dev->regmap[i])) {
  74                         return dev_err_probe(&spi->dev, PTR_ERR(dev->regmap[i]),
  75                                              "Failed to initialize regmap%i\n",
  76                                              regmap_config[i].val_bits);
  77                 }
  78         }
  79
  80         if (spi->dev.platform_data)
  81                 dev->pdata = spi->dev.platform_data;
  82
  83         /* setup spi */
  84         spi->mode = SPI_MODE_3;
  85         ret = spi_setup(spi);
  86         if (ret)
  87                 return ret;
  88
  89         dev->irq = spi->irq;
  90
  91         ret = ksz_switch_register(dev);
  92
  93         /* Main DSA driver may not be started yet. */
  94         if (ret)
  95                 return ret;
  96
  97         spi_set_drvdata(spi, dev);
  98
  99         return 0;
 100 }
 101
 102 static void ksz_spi_remove(struct spi_device *spi)
 103 {
 104         struct ksz_device *dev = spi_get_drvdata(spi);
 105
 106         if (dev)
 107                 ksz_switch_remove(dev);
 108 }
 109
 110 static void ksz_spi_shutdown(struct spi_device *spi)
 111 {
 112         struct ksz_device *dev = spi_get_drvdata(spi);
 113
 114         if (!dev)
 115                 return;
 116
 117         ksz_switch_shutdown(dev);
 118
 119         spi_set_drvdata(spi, NULL);
 120 }
 121
 122 static const struct of_device_id ksz_dt_ids[] = {
 123         {
 124                 .compatible = "microchip,ksz8765",
 125                 .data = &ksz_switch_chips[KSZ8765]
 126         },
 127         {
 128                 .compatible = "microchip,ksz8794",
 129                 .data = &ksz_switch_chips[KSZ8794]
 130         },
 131         {
 132                 .compatible = "microchip,ksz8795",
 133                 .data = &ksz_switch_chips[KSZ8795]
 134         },
 135         {
 136                 .compatible = "microchip,ksz8863",
 137                 .data = &ksz_switch_chips[KSZ8830]
 138         },
 139         {
 140                 .compatible = "microchip,ksz8873",
 141                 .data = &ksz_switch_chips[KSZ8830]
 142         },
 143         {
 144                 .compatible = "microchip,ksz9477",
 145                 .data = &ksz_switch_chips[KSZ9477]
 146         },
 147         {
 148                 .compatible = "microchip,ksz9896",
 149                 .data = &ksz_switch_chips[KSZ9896]
 150         },
 151         {
 152                 .compatible = "microchip,ksz9897",
 153                 .data = &ksz_switch_chips[KSZ9897]
 154         },
 155         {
 156                 .compatible = "microchip,ksz9893",
 157                 .data = &ksz_switch_chips[KSZ9893]
 158         },
 159         {
 160                 .compatible = "microchip,ksz9563",
 161                 .data = &ksz_switch_chips[KSZ9563]
 162         },
 163         {
 164                 .compatible = "microchip,ksz8563",
 165                 .data = &ksz_switch_chips[KSZ8563]
 166         },
 167         {
 168                 .compatible = "microchip,ksz9567",
 169                 .data = &ksz_switch_chips[KSZ9567]
 170         },
 171         {
 172                 .compatible = "microchip,lan9370",
 173                 .data = &ksz_switch_chips[LAN9370]
 174         },
 175         {
 176                 .compatible = "microchip,lan9371",
 177                 .data = &ksz_switch_chips[LAN9371]
 178         },
 179         {
 180                 .compatible = "microchip,lan9372",
 181                 .data = &ksz_switch_chips[LAN9372]
 182         },
 183         {
 184                 .compatible = "microchip,lan9373",
 185                 .data = &ksz_switch_chips[LAN9373]
 186         },
 187         {
 188                 .compatible = "microchip,lan9374",
 189                 .data = &ksz_switch_chips[LAN9374]
 190         },
 191         {},
 192 };
 193 MODULE_DEVICE_TABLE(of, ksz_dt_ids);
 194
 195 static const struct spi_device_id ksz_spi_ids[] = {
 196         { "ksz8765" },
 197         { "ksz8794" },
 198         { "ksz8795" },
 199         { "ksz8863" },
 200         { "ksz8873" },
 201         { "ksz9477" },
 202         { "ksz9896" },
 203         { "ksz9897" },
 204         { "ksz9893" },
 205         { "ksz9563" },
 206         { "ksz8563" },
 207         { "ksz9567" },
 208         { "lan9370" },
 209         { "lan9371" },
 210         { "lan9372" },
 211         { "lan9373" },
 212         { "lan9374" },
 213         { },
 214 };
 215 MODULE_DEVICE_TABLE(spi, ksz_spi_ids);
 216
 217 static struct spi_driver ksz_spi_driver = {
 218         .driver = {
 219                 .name   = "ksz-switch",
 220                 .owner  = THIS_MODULE,
 221                 .of_match_table = ksz_dt_ids,
 222         },
 223         .id_table = ksz_spi_ids,
 224         .probe  = ksz_spi_probe,
 225         .remove = ksz_spi_remove,
 226         .shutdown = ksz_spi_shutdown,
 227 };
 228
 229 module_spi_driver(ksz_spi_driver);
 230
 231 MODULE_ALIAS("spi:ksz9477");
 232 MODULE_ALIAS("spi:ksz9896");
 233 MODULE_ALIAS("spi:ksz9897");
 234 MODULE_ALIAS("spi:ksz9893");
 235 MODULE_ALIAS("spi:ksz9563");
 236 MODULE_ALIAS("spi:ksz8563");
 237 MODULE_ALIAS("spi:ksz9567");
 238 MODULE_ALIAS("spi:lan937x");
 239 MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
 240 MODULE_DESCRIPTION("Microchip ksz Series Switch SPI Driver");
 241 MODULE_LICENSE("GPL");