LXR linux/drivers/net/dsa/lan9303

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de>
   4 *
   5 * Partially based on a patch from
   6 * Copyright (c) 2014 Stefan Roese <sr@denx.de>
   7 */
   8#include <linux/kernel.h>
   9#include <linux/module.h>
  10#include <linux/mdio.h>
  11#include <linux/phy.h>
  12#include <linux/of.h>
  13
  14#include "lan9303.h"
  15
  16/* Generate phy-addr and -reg from the input address */
  17#define PHY_ADDR(x) ((((x) >> 6) + 0x10) & 0x1f)
  18#define PHY_REG(x) (((x) >> 1) & 0x1f)
  19
  20struct lan9303_mdio {
  21        struct mdio_device *device;
  22        struct lan9303 chip;
  23};
  24
  25static void lan9303_mdio_real_write(struct mdio_device *mdio, int reg, u16 val)
  26{
  27        mdio->bus->write(mdio->bus, PHY_ADDR(reg), PHY_REG(reg), val);
  28}
  29
  30static int lan9303_mdio_write(void *ctx, uint32_t reg, uint32_t val)
  31{
  32        struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
  33
  34        reg <<= 2; /* reg num to offset */
  35        mutex_lock(&sw_dev->device->bus->mdio_lock);
  36        lan9303_mdio_real_write(sw_dev->device, reg, val & 0xffff);
  37        lan9303_mdio_real_write(sw_dev->device, reg + 2, (val >> 16) & 0xffff);
  38        mutex_unlock(&sw_dev->device->bus->mdio_lock);
  39
  40        return 0;
  41}
  42
  43static u16 lan9303_mdio_real_read(struct mdio_device *mdio, int reg)
  44{
  45        return mdio->bus->read(mdio->bus, PHY_ADDR(reg), PHY_REG(reg));
  46}
  47
  48static int lan9303_mdio_read(void *ctx, uint32_t reg, uint32_t *val)
  49{
  50        struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
  51
  52        reg <<= 2; /* reg num to offset */
  53        mutex_lock(&sw_dev->device->bus->mdio_lock);
  54        *val = lan9303_mdio_real_read(sw_dev->device, reg);
  55        *val |= (lan9303_mdio_real_read(sw_dev->device, reg + 2) << 16);
  56        mutex_unlock(&sw_dev->device->bus->mdio_lock);
  57
  58        return 0;
  59}
  60
  61static int lan9303_mdio_phy_write(struct lan9303 *chip, int phy, int reg,
  62                                  u16 val)
  63{
  64        struct lan9303_mdio *sw_dev = dev_get_drvdata(chip->dev);
  65
  66        return mdiobus_write_nested(sw_dev->device->bus, phy, reg, val);
  67}
  68
  69static int lan9303_mdio_phy_read(struct lan9303 *chip, int phy,  int reg)
  70{
  71        struct lan9303_mdio *sw_dev = dev_get_drvdata(chip->dev);
  72
  73        return mdiobus_read_nested(sw_dev->device->bus, phy, reg);
  74}
  75
  76static const struct lan9303_phy_ops lan9303_mdio_phy_ops = {
  77        .phy_read = lan9303_mdio_phy_read,
  78        .phy_write = lan9303_mdio_phy_write,
  79};
  80
  81static const struct regmap_config lan9303_mdio_regmap_config = {
  82        .reg_bits = 8,
  83        .val_bits = 32,
  84        .reg_stride = 1,
  85        .can_multi_write = true,
  86        .max_register = 0x0ff, /* address bits 0..1 are not used */
  87        .reg_format_endian = REGMAP_ENDIAN_LITTLE,
  88
  89        .volatile_table = &lan9303_register_set,
  90        .wr_table = &lan9303_register_set,
  91        .rd_table = &lan9303_register_set,
  92
  93        .reg_read = lan9303_mdio_read,
  94        .reg_write = lan9303_mdio_write,
  95
  96        .cache_type = REGCACHE_NONE,
  97};
  98
  99static int lan9303_mdio_probe(struct mdio_device *mdiodev)
 100{
 101        struct lan9303_mdio *sw_dev;
 102        int ret;
 103
 104        sw_dev = devm_kzalloc(&mdiodev->dev, sizeof(struct lan9303_mdio),
 105                              GFP_KERNEL);
 106        if (!sw_dev)
 107                return -ENOMEM;
 108
 109        sw_dev->chip.regmap = devm_regmap_init(&mdiodev->dev, NULL, sw_dev,
 110                                               &lan9303_mdio_regmap_config);
 111        if (IS_ERR(sw_dev->chip.regmap)) {
 112                ret = PTR_ERR(sw_dev->chip.regmap);
 113                dev_err(&mdiodev->dev, "regmap init failed: %d\n", ret);
 114                return ret;
 115        }
 116
 117        /* link forward and backward */
 118        sw_dev->device = mdiodev;
 119        dev_set_drvdata(&mdiodev->dev, sw_dev);
 120        sw_dev->chip.dev = &mdiodev->dev;
 121
 122        sw_dev->chip.ops = &lan9303_mdio_phy_ops;
 123
 124        ret = lan9303_probe(&sw_dev->chip, mdiodev->dev.of_node);
 125        if (ret != 0)
 126                return ret;
 127
 128        dev_info(&mdiodev->dev, "LAN9303 MDIO driver loaded successfully\n");
 129
 130        return 0;
 131}
 132
 133static void lan9303_mdio_remove(struct mdio_device *mdiodev)
 134{
 135        struct lan9303_mdio *sw_dev = dev_get_drvdata(&mdiodev->dev);
 136
 137        if (!sw_dev)
 138                return;
 139
 140        lan9303_remove(&sw_dev->chip);
 141}
 142
 143/*-------------------------------------------------------------------------*/
 144
 145static const struct of_device_id lan9303_mdio_of_match[] = {
 146        { .compatible = "smsc,lan9303-mdio" },
 147        { /* sentinel */ },
 148};
 149MODULE_DEVICE_TABLE(of, lan9303_mdio_of_match);
 150
 151static struct mdio_driver lan9303_mdio_driver = {
 152        .mdiodrv.driver = {
 153                .name = "LAN9303_MDIO",
 154                .of_match_table = of_match_ptr(lan9303_mdio_of_match),
 155        },
 156        .probe  = lan9303_mdio_probe,
 157        .remove = lan9303_mdio_remove,
 158};
 159mdio_module_driver(lan9303_mdio_driver);
 160
 161MODULE_AUTHOR("Stefan Roese <sr@denx.de>, Juergen Borleis <kernel@pengutronix.de>");
 162MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in MDIO managed mode");
 163MODULE_LICENSE("GPL v2");
 164