149 lines
4.1 KiB
C
149 lines
4.1 KiB
C
/*
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* Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de>
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*
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* Partially based on a patch from
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* Copyright (c) 2014 Stefan Roese <sr@denx.de>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mdio.h>
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#include <linux/phy.h>
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#include <linux/of.h>
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#include "lan9303.h"
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/* Generate phy-addr and -reg from the input address */
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#define PHY_ADDR(x) ((((x) >> 6) + 0x10) & 0x1f)
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#define PHY_REG(x) (((x) >> 1) & 0x1f)
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struct lan9303_mdio {
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struct mdio_device *device;
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struct lan9303 chip;
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};
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static void lan9303_mdio_real_write(struct mdio_device *mdio, int reg, u16 val)
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{
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mdio->bus->write(mdio->bus, PHY_ADDR(reg), PHY_REG(reg), val);
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}
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static int lan9303_mdio_write(void *ctx, uint32_t reg, uint32_t val)
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{
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struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
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mutex_lock(&sw_dev->device->bus->mdio_lock);
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lan9303_mdio_real_write(sw_dev->device, reg, val & 0xffff);
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lan9303_mdio_real_write(sw_dev->device, reg + 2, (val >> 16) & 0xffff);
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mutex_unlock(&sw_dev->device->bus->mdio_lock);
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return 0;
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}
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static u16 lan9303_mdio_real_read(struct mdio_device *mdio, int reg)
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{
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return mdio->bus->read(mdio->bus, PHY_ADDR(reg), PHY_REG(reg));
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}
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static int lan9303_mdio_read(void *ctx, uint32_t reg, uint32_t *val)
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{
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struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
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mutex_lock(&sw_dev->device->bus->mdio_lock);
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*val = lan9303_mdio_real_read(sw_dev->device, reg);
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*val |= (lan9303_mdio_real_read(sw_dev->device, reg + 2) << 16);
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mutex_unlock(&sw_dev->device->bus->mdio_lock);
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return 0;
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}
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static const struct regmap_config lan9303_mdio_regmap_config = {
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.reg_bits = 8,
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.val_bits = 32,
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.reg_stride = 1,
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.can_multi_write = true,
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.max_register = 0x0ff, /* address bits 0..1 are not used */
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.reg_format_endian = REGMAP_ENDIAN_LITTLE,
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.volatile_table = &lan9303_register_set,
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.wr_table = &lan9303_register_set,
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.rd_table = &lan9303_register_set,
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.reg_read = lan9303_mdio_read,
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.reg_write = lan9303_mdio_write,
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.cache_type = REGCACHE_NONE,
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};
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static int lan9303_mdio_probe(struct mdio_device *mdiodev)
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{
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struct lan9303_mdio *sw_dev;
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int ret;
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sw_dev = devm_kzalloc(&mdiodev->dev, sizeof(struct lan9303_mdio),
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GFP_KERNEL);
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if (!sw_dev)
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return -ENOMEM;
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sw_dev->chip.regmap = devm_regmap_init(&mdiodev->dev, NULL, sw_dev,
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&lan9303_mdio_regmap_config);
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if (IS_ERR(sw_dev->chip.regmap)) {
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ret = PTR_ERR(sw_dev->chip.regmap);
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dev_err(&mdiodev->dev, "regmap init failed: %d\n", ret);
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return ret;
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}
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/* link forward and backward */
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sw_dev->device = mdiodev;
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dev_set_drvdata(&mdiodev->dev, sw_dev);
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sw_dev->chip.dev = &mdiodev->dev;
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ret = lan9303_probe(&sw_dev->chip, mdiodev->dev.of_node);
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if (ret != 0)
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return ret;
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dev_info(&mdiodev->dev, "LAN9303 MDIO driver loaded successfully\n");
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return 0;
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}
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static void lan9303_mdio_remove(struct mdio_device *mdiodev)
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{
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struct lan9303_mdio *sw_dev = dev_get_drvdata(&mdiodev->dev);
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if (!sw_dev)
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return;
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lan9303_remove(&sw_dev->chip);
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}
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/*-------------------------------------------------------------------------*/
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static const struct of_device_id lan9303_mdio_of_match[] = {
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{ .compatible = "smsc,lan9303-mdio" },
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{ /* sentinel */ },
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};
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MODULE_DEVICE_TABLE(of, lan9303_mdio_of_match);
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static struct mdio_driver lan9303_mdio_driver = {
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.mdiodrv.driver = {
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.name = "LAN9303_MDIO",
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.of_match_table = of_match_ptr(lan9303_mdio_of_match),
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},
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.probe = lan9303_mdio_probe,
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.remove = lan9303_mdio_remove,
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};
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mdio_module_driver(lan9303_mdio_driver);
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MODULE_AUTHOR("Stefan Roese <sr@denx.de>, Juergen Borleis <kernel@pengutronix.de>");
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MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in MDIO managed mode");
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MODULE_LICENSE("GPL v2");
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