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