drivers/cdx/controller/bitfield.h

   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 */