mirror of
https://github.com/torvalds/linux.git
synced 2024-11-29 23:51:37 +00:00
dc70058315
When the LAN9303 device is in MDIO manged mode, all register accesses must be done via MDIO. Please note: this code is compile time tested only due to the absence of such configured hardware. It is based on a patch from Stefan Roese from 2014. Signed-off-by: Juergen Borleis <jbe@pengutronix.de> CC: devicetree@vger.kernel.org CC: robh+dt@kernel.org CC: mark.rutland@arm.com CC: sr@denx.de Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
149 lines
4.1 KiB
C
149 lines
4.1 KiB
C
/*
|
|
* Copyright (C) 2017 Pengutronix, Juergen Borleis <kernel@pengutronix.de>
|
|
*
|
|
* Partially based on a patch from
|
|
* Copyright (c) 2014 Stefan Roese <sr@denx.de>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mdio.h>
|
|
#include <linux/phy.h>
|
|
#include <linux/of.h>
|
|
|
|
#include "lan9303.h"
|
|
|
|
/* Generate phy-addr and -reg from the input address */
|
|
#define PHY_ADDR(x) ((((x) >> 6) + 0x10) & 0x1f)
|
|
#define PHY_REG(x) (((x) >> 1) & 0x1f)
|
|
|
|
struct lan9303_mdio {
|
|
struct mdio_device *device;
|
|
struct lan9303 chip;
|
|
};
|
|
|
|
static void lan9303_mdio_real_write(struct mdio_device *mdio, int reg, u16 val)
|
|
{
|
|
mdio->bus->write(mdio->bus, PHY_ADDR(reg), PHY_REG(reg), val);
|
|
}
|
|
|
|
static int lan9303_mdio_write(void *ctx, uint32_t reg, uint32_t val)
|
|
{
|
|
struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
|
|
|
|
mutex_lock(&sw_dev->device->bus->mdio_lock);
|
|
lan9303_mdio_real_write(sw_dev->device, reg, val & 0xffff);
|
|
lan9303_mdio_real_write(sw_dev->device, reg + 2, (val >> 16) & 0xffff);
|
|
mutex_unlock(&sw_dev->device->bus->mdio_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static u16 lan9303_mdio_real_read(struct mdio_device *mdio, int reg)
|
|
{
|
|
return mdio->bus->read(mdio->bus, PHY_ADDR(reg), PHY_REG(reg));
|
|
}
|
|
|
|
static int lan9303_mdio_read(void *ctx, uint32_t reg, uint32_t *val)
|
|
{
|
|
struct lan9303_mdio *sw_dev = (struct lan9303_mdio *)ctx;
|
|
|
|
mutex_lock(&sw_dev->device->bus->mdio_lock);
|
|
*val = lan9303_mdio_real_read(sw_dev->device, reg);
|
|
*val |= (lan9303_mdio_real_read(sw_dev->device, reg + 2) << 16);
|
|
mutex_unlock(&sw_dev->device->bus->mdio_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct regmap_config lan9303_mdio_regmap_config = {
|
|
.reg_bits = 8,
|
|
.val_bits = 32,
|
|
.reg_stride = 1,
|
|
.can_multi_write = true,
|
|
.max_register = 0x0ff, /* address bits 0..1 are not used */
|
|
.reg_format_endian = REGMAP_ENDIAN_LITTLE,
|
|
|
|
.volatile_table = &lan9303_register_set,
|
|
.wr_table = &lan9303_register_set,
|
|
.rd_table = &lan9303_register_set,
|
|
|
|
.reg_read = lan9303_mdio_read,
|
|
.reg_write = lan9303_mdio_write,
|
|
|
|
.cache_type = REGCACHE_NONE,
|
|
};
|
|
|
|
static int lan9303_mdio_probe(struct mdio_device *mdiodev)
|
|
{
|
|
struct lan9303_mdio *sw_dev;
|
|
int ret;
|
|
|
|
sw_dev = devm_kzalloc(&mdiodev->dev, sizeof(struct lan9303_mdio),
|
|
GFP_KERNEL);
|
|
if (!sw_dev)
|
|
return -ENOMEM;
|
|
|
|
sw_dev->chip.regmap = devm_regmap_init(&mdiodev->dev, NULL, sw_dev,
|
|
&lan9303_mdio_regmap_config);
|
|
if (IS_ERR(sw_dev->chip.regmap)) {
|
|
ret = PTR_ERR(sw_dev->chip.regmap);
|
|
dev_err(&mdiodev->dev, "regmap init failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/* link forward and backward */
|
|
sw_dev->device = mdiodev;
|
|
dev_set_drvdata(&mdiodev->dev, sw_dev);
|
|
sw_dev->chip.dev = &mdiodev->dev;
|
|
|
|
ret = lan9303_probe(&sw_dev->chip, mdiodev->dev.of_node);
|
|
if (ret != 0)
|
|
return ret;
|
|
|
|
dev_info(&mdiodev->dev, "LAN9303 MDIO driver loaded successfully\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void lan9303_mdio_remove(struct mdio_device *mdiodev)
|
|
{
|
|
struct lan9303_mdio *sw_dev = dev_get_drvdata(&mdiodev->dev);
|
|
|
|
if (!sw_dev)
|
|
return;
|
|
|
|
lan9303_remove(&sw_dev->chip);
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static const struct of_device_id lan9303_mdio_of_match[] = {
|
|
{ .compatible = "smsc,lan9303-mdio" },
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, lan9303_mdio_of_match);
|
|
|
|
static struct mdio_driver lan9303_mdio_driver = {
|
|
.mdiodrv.driver = {
|
|
.name = "LAN9303_MDIO",
|
|
.of_match_table = of_match_ptr(lan9303_mdio_of_match),
|
|
},
|
|
.probe = lan9303_mdio_probe,
|
|
.remove = lan9303_mdio_remove,
|
|
};
|
|
mdio_module_driver(lan9303_mdio_driver);
|
|
|
|
MODULE_AUTHOR("Stefan Roese <sr@denx.de>, Juergen Borleis <kernel@pengutronix.de>");
|
|
MODULE_DESCRIPTION("Driver for SMSC/Microchip LAN9303 three port ethernet switch in MDIO managed mode");
|
|
MODULE_LICENSE("GPL v2");
|