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// SPDX-License-Identifier: GPL-2.0
/*
* Microchip KSZ8863 series register access through SMI
*
* Copyright (C) 2019 Pengutronix, Michael Grzeschik <kernel@pengutronix.de>
*/
#include "ksz8.h"
#include "ksz_common.h"
/* Serial Management Interface (SMI) uses the following frame format:
*
* preamble|start|Read/Write| PHY | REG |TA| Data bits | Idle
* |frame| OP code |address |address| | |
* read | 32x1´s | 01 | 00 | 1xRRR | RRRRR |Z0| 00000000DDDDDDDD | Z
* write| 32x1´s | 01 | 00 | 0xRRR | RRRRR |10| xxxxxxxxDDDDDDDD | Z
*
*/
#define SMI_KSZ88XX_READ_PHY BIT(4)
static int ksz8863_mdio_read(void *ctx, const void *reg_buf, size_t reg_len,
void *val_buf, size_t val_len)
{
struct ksz_device *dev = ctx;
struct mdio_device *mdev;
u8 reg = *(u8 *)reg_buf;
u8 *val = val_buf;
struct ksz8 *ksz8;
int i, ret = 0;
ksz8 = dev->priv;
mdev = ksz8->priv;
mutex_lock_nested(&mdev->bus->mdio_lock, MDIO_MUTEX_NESTED);
for (i = 0; i < val_len; i++) {
int tmp = reg + i;
ret = __mdiobus_read(mdev->bus, ((tmp & 0xE0) >> 5) |
SMI_KSZ88XX_READ_PHY, tmp);
if (ret < 0)
goto out;
val[i] = ret;
}
ret = 0;
out:
mutex_unlock(&mdev->bus->mdio_lock);
return ret;
}
static int ksz8863_mdio_write(void *ctx, const void *data, size_t count)
{
struct ksz_device *dev = ctx;
struct mdio_device *mdev;
struct ksz8 *ksz8;
int i, ret = 0;
u32 reg;
u8 *val;
ksz8 = dev->priv;
mdev = ksz8->priv;
val = (u8 *)(data + 4);
reg = *(u32 *)data;
mutex_lock_nested(&mdev->bus->mdio_lock, MDIO_MUTEX_NESTED);
for (i = 0; i < (count - 4); i++) {
int tmp = reg + i;
ret = __mdiobus_write(mdev->bus, ((tmp & 0xE0) >> 5),
tmp, val[i]);
if (ret < 0)
goto out;
}
out:
mutex_unlock(&mdev->bus->mdio_lock);
return ret;
}
static const struct regmap_bus regmap_smi[] = {
{
.read = ksz8863_mdio_read,
.write = ksz8863_mdio_write,
.max_raw_read = 1,
.max_raw_write = 1,
},
{
.read = ksz8863_mdio_read,
.write = ksz8863_mdio_write,
.val_format_endian_default = REGMAP_ENDIAN_BIG,
.max_raw_read = 2,
.max_raw_write = 2,
},
{
.read = ksz8863_mdio_read,
.write = ksz8863_mdio_write,
.val_format_endian_default = REGMAP_ENDIAN_BIG,
.max_raw_read = 4,
.max_raw_write = 4,
}
};
static const struct regmap_config ksz8863_regmap_config[] = {
{
.name = "#8",
.reg_bits = 8,
.pad_bits = 24,
.val_bits = 8,
.cache_type = REGCACHE_NONE,
.use_single_read = 1,
.lock = ksz_regmap_lock,
.unlock = ksz_regmap_unlock,
},
{
.name = "#16",
.reg_bits = 8,
.pad_bits = 24,
.val_bits = 16,
.cache_type = REGCACHE_NONE,
.use_single_read = 1,
.lock = ksz_regmap_lock,
.unlock = ksz_regmap_unlock,
},
{
.name = "#32",
.reg_bits = 8,
.pad_bits = 24,
.val_bits = 32,
.cache_type = REGCACHE_NONE,
.use_single_read = 1,
.lock = ksz_regmap_lock,
.unlock = ksz_regmap_unlock,
}
};
static int ksz8863_smi_probe(struct mdio_device *mdiodev)
{
struct regmap_config rc;
struct ksz_device *dev;
struct ksz8 *ksz8;
int ret;
int i;
ksz8 = devm_kzalloc(&mdiodev->dev, sizeof(struct ksz8), GFP_KERNEL);
ksz8->priv = mdiodev;
dev = ksz_switch_alloc(&mdiodev->dev, ksz8);
if (!dev)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(ksz8863_regmap_config); i++) {
rc = ksz8863_regmap_config[i];
rc.lock_arg = &dev->regmap_mutex;
dev->regmap[i] = devm_regmap_init(&mdiodev->dev,
®map_smi[i], dev,
&rc);
if (IS_ERR(dev->regmap[i])) {
ret = PTR_ERR(dev->regmap[i]);
dev_err(&mdiodev->dev,
"Failed to initialize regmap%i: %d\n",
ksz8863_regmap_config[i].val_bits, ret);
return ret;
}
}
if (mdiodev->dev.platform_data)
dev->pdata = mdiodev->dev.platform_data;
ret = ksz8_switch_register(dev);
/* Main DSA driver may not be started yet. */
if (ret)
return ret;
dev_set_drvdata(&mdiodev->dev, dev);
return 0;
}
static void ksz8863_smi_remove(struct mdio_device *mdiodev)
{
struct ksz_device *dev = dev_get_drvdata(&mdiodev->dev);
if (dev)
ksz_switch_remove(dev);
}
static const struct of_device_id ksz8863_dt_ids[] = {
{ .compatible = "microchip,ksz8863" },
{ .compatible = "microchip,ksz8873" },
{ },
};
MODULE_DEVICE_TABLE(of, ksz8863_dt_ids);
static struct mdio_driver ksz8863_driver = {
.probe = ksz8863_smi_probe,
.remove = ksz8863_smi_remove,
.mdiodrv.driver = {
.name = "ksz8863-switch",
.of_match_table = ksz8863_dt_ids,
},
};
mdio_module_driver(ksz8863_driver);
MODULE_AUTHOR("Michael Grzeschik <m.grzeschik@pengutronix.de>");
MODULE_DESCRIPTION("Microchip KSZ8863 SMI Switch driver");
MODULE_LICENSE("GPL v2");
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