1 | /* SPDX-License-Identifier: GPL-2.0 |
2 | * |
3 | * Copyright 2005-2006 Fen Systems Ltd. |
4 | * Copyright 2006-2013 Solarflare Communications Inc. |
5 | * Copyright (C) 2022-2023, Advanced Micro Devices, Inc. |
6 | */ |
7 | |
8 | #ifndef CDX_BITFIELD_H |
9 | #define CDX_BITFIELD_H |
10 | |
11 | #include <linux/bitfield.h> |
12 | |
13 | /* Lowest bit numbers and widths */ |
14 | #define CDX_DWORD_LBN 0 |
15 | #define CDX_DWORD_WIDTH 32 |
16 | |
17 | /* Specified attribute (e.g. LBN) of the specified field */ |
18 | #define CDX_VAL(field, attribute) field ## _ ## attribute |
19 | /* Low bit number of the specified field */ |
20 | #define CDX_LOW_BIT(field) CDX_VAL(field, LBN) |
21 | /* Bit width of the specified field */ |
22 | #define CDX_WIDTH(field) CDX_VAL(field, WIDTH) |
23 | /* High bit number of the specified field */ |
24 | #define CDX_HIGH_BIT(field) (CDX_LOW_BIT(field) + CDX_WIDTH(field) - 1) |
25 | |
26 | /* A doubleword (i.e. 4 byte) datatype - little-endian in HW */ |
27 | struct cdx_dword { |
28 | __le32 cdx_u32; |
29 | }; |
30 | |
31 | /* Value expanders for printk */ |
32 | #define CDX_DWORD_VAL(dword) \ |
33 | ((unsigned int)le32_to_cpu((dword).cdx_u32)) |
34 | |
35 | /* |
36 | * Extract bit field portion [low,high) from the 32-bit little-endian |
37 | * element which contains bits [min,max) |
38 | */ |
39 | #define CDX_DWORD_FIELD(dword, field) \ |
40 | (FIELD_GET(GENMASK(CDX_HIGH_BIT(field), CDX_LOW_BIT(field)), \ |
41 | le32_to_cpu((dword).cdx_u32))) |
42 | |
43 | /* |
44 | * Creates the portion of the named bit field that lies within the |
45 | * range [min,max). |
46 | */ |
47 | #define CDX_INSERT_FIELD(field, value) \ |
48 | (FIELD_PREP(GENMASK(CDX_HIGH_BIT(field), \ |
49 | CDX_LOW_BIT(field)), value)) |
50 | |
51 | /* |
52 | * Creates the portion of the named bit fields that lie within the |
53 | * range [min,max). |
54 | */ |
55 | #define CDX_INSERT_FIELDS(field1, value1, \ |
56 | field2, value2, \ |
57 | field3, value3, \ |
58 | field4, value4, \ |
59 | field5, value5, \ |
60 | field6, value6, \ |
61 | field7, value7) \ |
62 | (CDX_INSERT_FIELD(field1, (value1)) | \ |
63 | CDX_INSERT_FIELD(field2, (value2)) | \ |
64 | CDX_INSERT_FIELD(field3, (value3)) | \ |
65 | CDX_INSERT_FIELD(field4, (value4)) | \ |
66 | CDX_INSERT_FIELD(field5, (value5)) | \ |
67 | CDX_INSERT_FIELD(field6, (value6)) | \ |
68 | CDX_INSERT_FIELD(field7, (value7))) |
69 | |
70 | #define CDX_POPULATE_DWORD(dword, ...) \ |
71 | (dword).cdx_u32 = cpu_to_le32(CDX_INSERT_FIELDS(__VA_ARGS__)) |
72 | |
73 | /* Populate a dword field with various numbers of arguments */ |
74 | #define CDX_POPULATE_DWORD_7 CDX_POPULATE_DWORD |
75 | #define CDX_POPULATE_DWORD_6(dword, ...) \ |
76 | CDX_POPULATE_DWORD_7(dword, CDX_DWORD, 0, __VA_ARGS__) |
77 | #define CDX_POPULATE_DWORD_5(dword, ...) \ |
78 | CDX_POPULATE_DWORD_6(dword, CDX_DWORD, 0, __VA_ARGS__) |
79 | #define CDX_POPULATE_DWORD_4(dword, ...) \ |
80 | CDX_POPULATE_DWORD_5(dword, CDX_DWORD, 0, __VA_ARGS__) |
81 | #define CDX_POPULATE_DWORD_3(dword, ...) \ |
82 | CDX_POPULATE_DWORD_4(dword, CDX_DWORD, 0, __VA_ARGS__) |
83 | #define CDX_POPULATE_DWORD_2(dword, ...) \ |
84 | CDX_POPULATE_DWORD_3(dword, CDX_DWORD, 0, __VA_ARGS__) |
85 | #define CDX_POPULATE_DWORD_1(dword, ...) \ |
86 | CDX_POPULATE_DWORD_2(dword, CDX_DWORD, 0, __VA_ARGS__) |
87 | #define CDX_SET_DWORD(dword) \ |
88 | CDX_POPULATE_DWORD_1(dword, CDX_DWORD, 0xffffffff) |
89 | |
90 | #endif /* CDX_BITFIELD_H */ |
91 | |