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1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * Marvell 88E6xxx Switch Hidden Registers support | |
4 | * | |
5 | * Copyright (c) 2008 Marvell Semiconductor | |
6 | * | |
7 | * Copyright (c) 2019 Andrew Lunn <andrew@lunn.ch> | |
8 | */ | |
9 | ||
10 | #include <linux/bitfield.h> | |
11 | ||
12 | #include "chip.h" | |
13 | #include "port.h" | |
14 | ||
15 | /* The mv88e6390 and mv88e6341 have some hidden registers used for debug and | |
16 | * development. The errata also makes use of them. | |
17 | */ | |
18 | int mv88e6xxx_port_hidden_write(struct mv88e6xxx_chip *chip, int block, | |
19 | int port, int reg, u16 val) | |
20 | { | |
21 | u16 ctrl; | |
22 | int err; | |
23 | ||
24 | err = mv88e6xxx_port_write(chip, MV88E6XXX_PORT_RESERVED_1A_DATA_PORT, | |
25 | MV88E6XXX_PORT_RESERVED_1A, val); | |
26 | if (err) | |
27 | return err; | |
28 | ||
29 | ctrl = MV88E6XXX_PORT_RESERVED_1A_BUSY | | |
30 | MV88E6XXX_PORT_RESERVED_1A_WRITE | | |
31 | block << MV88E6XXX_PORT_RESERVED_1A_BLOCK_SHIFT | | |
32 | port << MV88E6XXX_PORT_RESERVED_1A_PORT_SHIFT | | |
33 | reg; | |
34 | ||
35 | return mv88e6xxx_port_write(chip, MV88E6XXX_PORT_RESERVED_1A_CTRL_PORT, | |
36 | MV88E6XXX_PORT_RESERVED_1A, ctrl); | |
37 | } | |
38 | ||
39 | int mv88e6xxx_port_hidden_wait(struct mv88e6xxx_chip *chip) | |
40 | { | |
41 | int bit = __bf_shf(MV88E6XXX_PORT_RESERVED_1A_BUSY); | |
42 | ||
24cbdb91 NR |
43 | return mv88e6xxx_port_wait_bit(chip, |
44 | MV88E6XXX_PORT_RESERVED_1A_CTRL_PORT, | |
45 | MV88E6XXX_PORT_RESERVED_1A, bit, 0); | |
60907013 MB |
46 | } |
47 | ||
48 | int mv88e6xxx_port_hidden_read(struct mv88e6xxx_chip *chip, int block, int port, | |
49 | int reg, u16 *val) | |
50 | { | |
51 | u16 ctrl; | |
52 | int err; | |
53 | ||
54 | ctrl = MV88E6XXX_PORT_RESERVED_1A_BUSY | | |
55 | MV88E6XXX_PORT_RESERVED_1A_READ | | |
56 | block << MV88E6XXX_PORT_RESERVED_1A_BLOCK_SHIFT | | |
57 | port << MV88E6XXX_PORT_RESERVED_1A_PORT_SHIFT | | |
58 | reg; | |
59 | ||
60 | err = mv88e6xxx_port_write(chip, MV88E6XXX_PORT_RESERVED_1A_CTRL_PORT, | |
61 | MV88E6XXX_PORT_RESERVED_1A, ctrl); | |
62 | if (err) | |
63 | return err; | |
64 | ||
65 | err = mv88e6xxx_port_hidden_wait(chip); | |
66 | if (err) | |
67 | return err; | |
68 | ||
69 | return mv88e6xxx_port_read(chip, MV88E6XXX_PORT_RESERVED_1A_DATA_PORT, | |
70 | MV88E6XXX_PORT_RESERVED_1A, val); | |
71 | } |