forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70 lines
1.9 KiB
70 lines
1.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* Marvell 88E6xxx Switch Hidden Registers support |
|
* |
|
* Copyright (c) 2008 Marvell Semiconductor |
|
* |
|
* Copyright (c) 2019 Andrew Lunn <[email protected]> |
|
*/ |
|
|
|
#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); |
|
}
|
|
|