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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Marvell 88E6xxx Switch Hidden Registers support
*
* Copyright (c) 2008 Marvell Semiconductor
*
* Copyright (c) 2019 Andrew Lunn <andrew@lunn.ch>
*/
#include <linux/bitfield.h>
#include "chip.h"
#include "port.h"
/* The mv88e6390 and mv88e6341 have some hidden registers used for debug and
* development. The errata also makes use of them.
*/
int mv88e6xxx_port_hidden_write(struct mv88e6xxx_chip *chip, int block,
int port, int reg, u16 val)
{
u16 ctrl;
int err;
err = mv88e6xxx_port_write(chip, MV88E6XXX_PORT_RESERVED_1A_DATA_PORT,
MV88E6XXX_PORT_RESERVED_1A, val);
if (err)
return err;
ctrl = MV88E6XXX_PORT_RESERVED_1A_BUSY |
MV88E6XXX_PORT_RESERVED_1A_WRITE |
block << MV88E6XXX_PORT_RESERVED_1A_BLOCK_SHIFT |
port << MV88E6XXX_PORT_RESERVED_1A_PORT_SHIFT |
reg;
return mv88e6xxx_port_write(chip, MV88E6XXX_PORT_RESERVED_1A_CTRL_PORT,
MV88E6XXX_PORT_RESERVED_1A, ctrl);
}
int mv88e6xxx_port_hidden_wait(struct mv88e6xxx_chip *chip)
{
int bit = __bf_shf(MV88E6XXX_PORT_RESERVED_1A_BUSY);
return mv88e6xxx_wait_bit(chip, MV88E6XXX_PORT_RESERVED_1A_CTRL_PORT,
MV88E6XXX_PORT_RESERVED_1A, bit, 0);
}
int mv88e6xxx_port_hidden_read(struct mv88e6xxx_chip *chip, int block, int port,
int reg, u16 *val)
{
u16 ctrl;
int err;
ctrl = MV88E6XXX_PORT_RESERVED_1A_BUSY |
MV88E6XXX_PORT_RESERVED_1A_READ |
block << MV88E6XXX_PORT_RESERVED_1A_BLOCK_SHIFT |
port << MV88E6XXX_PORT_RESERVED_1A_PORT_SHIFT |
reg;
err = mv88e6xxx_port_write(chip, MV88E6XXX_PORT_RESERVED_1A_CTRL_PORT,
MV88E6XXX_PORT_RESERVED_1A, ctrl);
if (err)
return err;
err = mv88e6xxx_port_hidden_wait(chip);
if (err)
return err;
return mv88e6xxx_port_read(chip, MV88E6XXX_PORT_RESERVED_1A_DATA_PORT,
MV88E6XXX_PORT_RESERVED_1A, val);
}
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