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