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// SPDX-License-Identifier: GPL-2.0+
/*
* Airoha Ethernet PHY common library
*
* Copyright (C) 2026 Airoha Technology Corp.
* Copyright (C) 2026 Collabora Ltd.
* Louis-Alexis Eyraud <louisalexis.eyraud@collabora.com>
*/
#include <linux/export.h>
#include <linux/module.h>
#include <linux/phy.h>
#include <linux/wordpart.h>
#include "air_phy_lib.h"
static int __air_buckpbus_reg_read(struct phy_device *phydev,
u32 pbus_address, u32 *pbus_data)
{
int pbus_data_low, pbus_data_high;
int ret;
ret = __phy_write(phydev, AIR_BPBUS_MODE, AIR_BPBUS_MODE_ADDR_FIXED);
if (ret < 0)
return ret;
ret = __phy_write(phydev, AIR_BPBUS_RD_ADDR_HIGH,
upper_16_bits(pbus_address));
if (ret < 0)
return ret;
ret = __phy_write(phydev, AIR_BPBUS_RD_ADDR_LOW,
lower_16_bits(pbus_address));
if (ret < 0)
return ret;
pbus_data_high = __phy_read(phydev, AIR_BPBUS_RD_DATA_HIGH);
if (pbus_data_high < 0)
return pbus_data_high;
pbus_data_low = __phy_read(phydev, AIR_BPBUS_RD_DATA_LOW);
if (pbus_data_low < 0)
return pbus_data_low;
*pbus_data = pbus_data_low | (pbus_data_high << 16);
return 0;
}
static int __air_buckpbus_reg_write(struct phy_device *phydev,
u32 pbus_address, u32 pbus_data)
{
int ret;
ret = __phy_write(phydev, AIR_BPBUS_MODE, AIR_BPBUS_MODE_ADDR_FIXED);
if (ret < 0)
return ret;
ret = __phy_write(phydev, AIR_BPBUS_WR_ADDR_HIGH,
upper_16_bits(pbus_address));
if (ret < 0)
return ret;
ret = __phy_write(phydev, AIR_BPBUS_WR_ADDR_LOW,
lower_16_bits(pbus_address));
if (ret < 0)
return ret;
ret = __phy_write(phydev, AIR_BPBUS_WR_DATA_HIGH,
upper_16_bits(pbus_data));
if (ret < 0)
return ret;
ret = __phy_write(phydev, AIR_BPBUS_WR_DATA_LOW,
lower_16_bits(pbus_data));
if (ret < 0)
return ret;
return 0;
}
static int __air_buckpbus_reg_modify(struct phy_device *phydev,
u32 pbus_address, u32 mask, u32 set)
{
int pbus_data_low, pbus_data_high;
u32 pbus_data_old, pbus_data_new;
int ret;
ret = __phy_write(phydev, AIR_BPBUS_MODE, AIR_BPBUS_MODE_ADDR_FIXED);
if (ret < 0)
return ret;
ret = __phy_write(phydev, AIR_BPBUS_RD_ADDR_HIGH,
upper_16_bits(pbus_address));
if (ret < 0)
return ret;
ret = __phy_write(phydev, AIR_BPBUS_RD_ADDR_LOW,
lower_16_bits(pbus_address));
if (ret < 0)
return ret;
pbus_data_high = __phy_read(phydev, AIR_BPBUS_RD_DATA_HIGH);
if (pbus_data_high < 0)
return pbus_data_high;
pbus_data_low = __phy_read(phydev, AIR_BPBUS_RD_DATA_LOW);
if (pbus_data_low < 0)
return pbus_data_low;
pbus_data_old = pbus_data_low | (pbus_data_high << 16);
pbus_data_new = (pbus_data_old & ~mask) | set;
if (pbus_data_new == pbus_data_old)
return 0;
ret = __phy_write(phydev, AIR_BPBUS_WR_ADDR_HIGH,
upper_16_bits(pbus_address));
if (ret < 0)
return ret;
ret = __phy_write(phydev, AIR_BPBUS_WR_ADDR_LOW,
lower_16_bits(pbus_address));
if (ret < 0)
return ret;
ret = __phy_write(phydev, AIR_BPBUS_WR_DATA_HIGH,
upper_16_bits(pbus_data_new));
if (ret < 0)
return ret;
ret = __phy_write(phydev, AIR_BPBUS_WR_DATA_LOW,
lower_16_bits(pbus_data_new));
if (ret < 0)
return ret;
return 0;
}
int air_phy_buckpbus_reg_read(struct phy_device *phydev, u32 pbus_address,
u32 *pbus_data)
{
int saved_page;
int ret = 0;
saved_page = phy_select_page(phydev, AIR_PHY_PAGE_EXTENDED_4);
if (saved_page >= 0) {
ret = __air_buckpbus_reg_read(phydev, pbus_address, pbus_data);
if (ret < 0)
phydev_err(phydev, "%s 0x%08x failed: %d\n", __func__,
pbus_address, ret);
}
return phy_restore_page(phydev, saved_page, ret);
}
EXPORT_SYMBOL_GPL(air_phy_buckpbus_reg_read);
int air_phy_buckpbus_reg_write(struct phy_device *phydev, u32 pbus_address,
u32 pbus_data)
{
int saved_page;
int ret = 0;
saved_page = phy_select_page(phydev, AIR_PHY_PAGE_EXTENDED_4);
if (saved_page >= 0) {
ret = __air_buckpbus_reg_write(phydev, pbus_address,
pbus_data);
if (ret < 0)
phydev_err(phydev, "%s 0x%08x failed: %d\n", __func__,
pbus_address, ret);
}
return phy_restore_page(phydev, saved_page, ret);
}
EXPORT_SYMBOL_GPL(air_phy_buckpbus_reg_write);
int air_phy_buckpbus_reg_modify(struct phy_device *phydev, u32 pbus_address,
u32 mask, u32 set)
{
int saved_page;
int ret = 0;
saved_page = phy_select_page(phydev, AIR_PHY_PAGE_EXTENDED_4);
if (saved_page >= 0) {
ret = __air_buckpbus_reg_modify(phydev, pbus_address, mask,
set);
if (ret < 0)
phydev_err(phydev, "%s 0x%08x failed: %d\n", __func__,
pbus_address, ret);
}
return phy_restore_page(phydev, saved_page, ret);
}
EXPORT_SYMBOL_GPL(air_phy_buckpbus_reg_modify);
int air_phy_read_page(struct phy_device *phydev)
{
return __phy_read(phydev, AIR_EXT_PAGE_ACCESS);
}
EXPORT_SYMBOL_GPL(air_phy_read_page);
int air_phy_write_page(struct phy_device *phydev, int page)
{
return __phy_write(phydev, AIR_EXT_PAGE_ACCESS, page);
}
EXPORT_SYMBOL_GPL(air_phy_write_page);
MODULE_DESCRIPTION("Airoha PHY Library");
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Louis-Alexis Eyraud");
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