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                 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         if (dev->dev_ops->reset)
 118                 dev->dev_ops->reset(dev);
 119
 120         dsa_switch_shutdown(dev->ds);
 121
 122         spi_set_drvdata(spi, NULL);
 123 }
 124
 125 static const struct of_device_id ksz_dt_ids[] = {
 126         {
 127                 .compatible = "microchip,ksz8765",
 128                 .data = &ksz_switch_chips[KSZ8765]
 129         },
 130         {
 131                 .compatible = "microchip,ksz8794",
 132                 .data = &ksz_switch_chips[KSZ8794]
 133         },
 134         {
 135                 .compatible = "microchip,ksz8795",
 136                 .data = &ksz_switch_chips[KSZ8795]
 137         },
 138         {
 139                 .compatible = "microchip,ksz8863",
 140                 .data = &ksz_switch_chips[KSZ8830]
 141         },
 142         {
 143                 .compatible = "microchip,ksz8873",
 144                 .data = &ksz_switch_chips[KSZ8830]
 145         },
 146         {
 147                 .compatible = "microchip,ksz9477",
 148                 .data = &ksz_switch_chips[KSZ9477]
 149         },
 150         {
 151                 .compatible = "microchip,ksz9896",
 152                 .data = &ksz_switch_chips[KSZ9896]
 153         },
 154         {
 155                 .compatible = "microchip,ksz9897",
 156                 .data = &ksz_switch_chips[KSZ9897]
 157         },
 158         {
 159                 .compatible = "microchip,ksz9893",
 160                 .data = &ksz_switch_chips[KSZ9893]
 161         },
 162         {
 163                 .compatible = "microchip,ksz9563",
 164                 .data = &ksz_switch_chips[KSZ9563]
 165         },
 166         {
 167                 .compatible = "microchip,ksz8563",
 168                 .data = &ksz_switch_chips[KSZ8563]
 169         },
 170         {
 171                 .compatible = "microchip,ksz9567",
 172                 .data = &ksz_switch_chips[KSZ9567]
 173         },
 174         {
 175                 .compatible = "microchip,lan9370",
 176                 .data = &ksz_switch_chips[LAN9370]
 177         },
 178         {
 179                 .compatible = "microchip,lan9371",
 180                 .data = &ksz_switch_chips[LAN9371]
 181         },
 182         {
 183                 .compatible = "microchip,lan9372",
 184                 .data = &ksz_switch_chips[LAN9372]
 185         },
 186         {
 187                 .compatible = "microchip,lan9373",
 188                 .data = &ksz_switch_chips[LAN9373]
 189         },
 190         {
 191                 .compatible = "microchip,lan9374",
 192                 .data = &ksz_switch_chips[LAN9374]
 193         },
 194         {},
 195 };
 196 MODULE_DEVICE_TABLE(of, ksz_dt_ids);
 197
 198 static const struct spi_device_id ksz_spi_ids[] = {
 199         { "ksz8765" },
 200         { "ksz8794" },
 201         { "ksz8795" },
 202         { "ksz8863" },
 203         { "ksz8873" },
 204         { "ksz9477" },
 205         { "ksz9896" },
 206         { "ksz9897" },
 207         { "ksz9893" },
 208         { "ksz9563" },
 209         { "ksz8563" },
 210         { "ksz9567" },
 211         { "lan9370" },
 212         { "lan9371" },
 213         { "lan9372" },
 214         { "lan9373" },
 215         { "lan9374" },
 216         { },
 217 };
 218 MODULE_DEVICE_TABLE(spi, ksz_spi_ids);
 219
 220 static struct spi_driver ksz_spi_driver = {
 221         .driver = {
 222                 .name   = "ksz-switch",
 223                 .owner  = THIS_MODULE,
 224                 .of_match_table = ksz_dt_ids,
 225         },
 226         .id_table = ksz_spi_ids,
 227         .probe  = ksz_spi_probe,
 228         .remove = ksz_spi_remove,
 229         .shutdown = ksz_spi_shutdown,
 230 };
 231
 232 module_spi_driver(ksz_spi_driver);
 233
 234 MODULE_ALIAS("spi:ksz9477");
 235 MODULE_ALIAS("spi:ksz9896");
 236 MODULE_ALIAS("spi:ksz9897");
 237 MODULE_ALIAS("spi:ksz9893");
 238 MODULE_ALIAS("spi:ksz9563");
 239 MODULE_ALIAS("spi:ksz8563");
 240 MODULE_ALIAS("spi:ksz9567");
 241 MODULE_ALIAS("spi:lan937x");
 242 MODULE_AUTHOR("Tristram Ha <[email protected]>");
 243 MODULE_DESCRIPTION("Microchip ksz Series Switch SPI Driver");
 244 MODULE_LICENSE("GPL");