dsa/microchip/ksz_spi.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Microchip ksz series register access through SPI
0004  *
0005  * Copyright (C) 2017 Microchip Technology Inc.
0006  *  Tristram Ha <Tristram.Ha@microchip.com>
0007  */
0008
0009 #include <asm/unaligned.h>
0010
0011 #include <linux/delay.h>
0012 #include <linux/kernel.h>
0013 #include <linux/module.h>
0014 #include <linux/regmap.h>
0015 #include <linux/spi/spi.h>
0016
0017 #include "ksz_common.h"
0018
0019 #define KSZ8795_SPI_ADDR_SHIFT          12
0020 #define KSZ8795_SPI_ADDR_ALIGN          3
0021 #define KSZ8795_SPI_TURNAROUND_SHIFT        1
0022
0023 #define KSZ8863_SPI_ADDR_SHIFT          8
0024 #define KSZ8863_SPI_ADDR_ALIGN          8
0025 #define KSZ8863_SPI_TURNAROUND_SHIFT        0
0026
0027 #define KSZ9477_SPI_ADDR_SHIFT          24
0028 #define KSZ9477_SPI_ADDR_ALIGN          3
0029 #define KSZ9477_SPI_TURNAROUND_SHIFT        5
0030
0031 KSZ_REGMAP_TABLE(ksz8795, 16, KSZ8795_SPI_ADDR_SHIFT,
0032          KSZ8795_SPI_TURNAROUND_SHIFT, KSZ8795_SPI_ADDR_ALIGN);
0033
0034 KSZ_REGMAP_TABLE(ksz8863, 16, KSZ8863_SPI_ADDR_SHIFT,
0035          KSZ8863_SPI_TURNAROUND_SHIFT, KSZ8863_SPI_ADDR_ALIGN);
0036
0037 KSZ_REGMAP_TABLE(ksz9477, 32, KSZ9477_SPI_ADDR_SHIFT,
0038          KSZ9477_SPI_TURNAROUND_SHIFT, KSZ9477_SPI_ADDR_ALIGN);
0039
0040 static int ksz_spi_probe(struct spi_device *spi)
0041 {
0042     const struct regmap_config *regmap_config;
0043     const struct ksz_chip_data *chip;
0044     struct device *ddev = &spi->dev;
0045     struct regmap_config rc;
0046     struct ksz_device *dev;
0047     int i, ret = 0;
0048
0049     dev = ksz_switch_alloc(&spi->dev, spi);
0050     if (!dev)
0051         return -ENOMEM;
0052
0053     chip = device_get_match_data(ddev);
0054     if (!chip)
0055         return -EINVAL;
0056
0057     if (chip->chip_id == KSZ8830_CHIP_ID)
0058         regmap_config = ksz8863_regmap_config;
0059     else if (chip->chip_id == KSZ8795_CHIP_ID ||
0060          chip->chip_id == KSZ8794_CHIP_ID ||
0061          chip->chip_id == KSZ8765_CHIP_ID)
0062         regmap_config = ksz8795_regmap_config;
0063     else
0064         regmap_config = ksz9477_regmap_config;
0065
0066     for (i = 0; i < ARRAY_SIZE(ksz8795_regmap_config); i++) {
0067         rc = regmap_config[i];
0068         rc.lock_arg = &dev->regmap_mutex;
0069         dev->regmap[i] = devm_regmap_init_spi(spi, &rc);
0070         if (IS_ERR(dev->regmap[i])) {
0071             ret = PTR_ERR(dev->regmap[i]);
0072             dev_err(&spi->dev,
0073                 "Failed to initialize regmap%i: %d\n",
0074                 regmap_config[i].val_bits, ret);
0075             return ret;
0076         }
0077     }
0078
0079     if (spi->dev.platform_data)
0080         dev->pdata = spi->dev.platform_data;
0081
0082     /* setup spi */
0083     spi->mode = SPI_MODE_3;
0084     ret = spi_setup(spi);
0085     if (ret)
0086         return ret;
0087
0088     ret = ksz_switch_register(dev);
0089
0090     /* Main DSA driver may not be started yet. */
0091     if (ret)
0092         return ret;
0093
0094     spi_set_drvdata(spi, dev);
0095
0096     return 0;
0097 }
0098
0099 static void ksz_spi_remove(struct spi_device *spi)
0100 {
0101     struct ksz_device *dev = spi_get_drvdata(spi);
0102
0103     if (dev)
0104         ksz_switch_remove(dev);
0105
0106     spi_set_drvdata(spi, NULL);
0107 }
0108
0109 static void ksz_spi_shutdown(struct spi_device *spi)
0110 {
0111     struct ksz_device *dev = spi_get_drvdata(spi);
0112
0113     if (!dev)
0114         return;
0115
0116     if (dev->dev_ops->reset)
0117         dev->dev_ops->reset(dev);
0118
0119     dsa_switch_shutdown(dev->ds);
0120
0121     spi_set_drvdata(spi, NULL);
0122 }
0123
0124 static const struct of_device_id ksz_dt_ids[] = {
0125     {
0126         .compatible = "microchip,ksz8765",
0127         .data = &ksz_switch_chips[KSZ8765]
0128     },
0129     {
0130         .compatible = "microchip,ksz8794",
0131         .data = &ksz_switch_chips[KSZ8794]
0132     },
0133     {
0134         .compatible = "microchip,ksz8795",
0135         .data = &ksz_switch_chips[KSZ8795]
0136     },
0137     {
0138         .compatible = "microchip,ksz8863",
0139         .data = &ksz_switch_chips[KSZ8830]
0140     },
0141     {
0142         .compatible = "microchip,ksz8873",
0143         .data = &ksz_switch_chips[KSZ8830]
0144     },
0145     {
0146         .compatible = "microchip,ksz9477",
0147         .data = &ksz_switch_chips[KSZ9477]
0148     },
0149     {
0150         .compatible = "microchip,ksz9897",
0151         .data = &ksz_switch_chips[KSZ9897]
0152     },
0153     {
0154         .compatible = "microchip,ksz9893",
0155         .data = &ksz_switch_chips[KSZ9893]
0156     },
0157     {
0158         .compatible = "microchip,ksz9563",
0159         .data = &ksz_switch_chips[KSZ9893]
0160     },
0161     {
0162         .compatible = "microchip,ksz8563",
0163         .data = &ksz_switch_chips[KSZ9893]
0164     },
0165     {
0166         .compatible = "microchip,ksz9567",
0167         .data = &ksz_switch_chips[KSZ9567]
0168     },
0169     {
0170         .compatible = "microchip,lan9370",
0171         .data = &ksz_switch_chips[LAN9370]
0172     },
0173     {
0174         .compatible = "microchip,lan9371",
0175         .data = &ksz_switch_chips[LAN9371]
0176     },
0177     {
0178         .compatible = "microchip,lan9372",
0179         .data = &ksz_switch_chips[LAN9372]
0180     },
0181     {
0182         .compatible = "microchip,lan9373",
0183         .data = &ksz_switch_chips[LAN9373]
0184     },
0185     {
0186         .compatible = "microchip,lan9374",
0187         .data = &ksz_switch_chips[LAN9374]
0188     },
0189     {},
0190 };
0191 MODULE_DEVICE_TABLE(of, ksz_dt_ids);
0192
0193 static const struct spi_device_id ksz_spi_ids[] = {
0194     { "ksz8765" },
0195     { "ksz8794" },
0196     { "ksz8795" },
0197     { "ksz8863" },
0198     { "ksz8873" },
0199     { "ksz9477" },
0200     { "ksz9897" },
0201     { "ksz9893" },
0202     { "ksz9563" },
0203     { "ksz8563" },
0204     { "ksz9567" },
0205     { "lan9370" },
0206     { "lan9371" },
0207     { "lan9372" },
0208     { "lan9373" },
0209     { "lan9374" },
0210     { },
0211 };
0212 MODULE_DEVICE_TABLE(spi, ksz_spi_ids);
0213
0214 static struct spi_driver ksz_spi_driver = {
0215     .driver = {
0216         .name   = "ksz-switch",
0217         .owner  = THIS_MODULE,
0218         .of_match_table = ksz_dt_ids,
0219     },
0220     .id_table = ksz_spi_ids,
0221     .probe  = ksz_spi_probe,
0222     .remove = ksz_spi_remove,
0223     .shutdown = ksz_spi_shutdown,
0224 };
0225
0226 module_spi_driver(ksz_spi_driver);
0227
0228 MODULE_ALIAS("spi:ksz9477");
0229 MODULE_ALIAS("spi:ksz9897");
0230 MODULE_ALIAS("spi:ksz9893");
0231 MODULE_ALIAS("spi:ksz9563");
0232 MODULE_ALIAS("spi:ksz8563");
0233 MODULE_ALIAS("spi:ksz9567");
0234 MODULE_ALIAS("spi:lan937x");
0235 MODULE_AUTHOR("Tristram Ha <Tristram.Ha@microchip.com>");
0236 MODULE_DESCRIPTION("Microchip ksz Series Switch SPI Driver");
0237 MODULE_LICENSE("GPL");