LXR linux/drivers/gpu/drm/amd/display/dmub/src/dmub

   1/*
   2 * Copyright 2019 Advanced Micro Devices, Inc.
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a
   5 * copy of this software and associated documentation files (the "Software"),
   6 * to deal in the Software without restriction, including without limitation
   7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8 * and/or sell copies of the Software, and to permit persons to whom the
   9 * Software is furnished to do so, subject to the following conditions:
  10 *
  11 * The above copyright notice and this permission notice shall be included in
  12 * all copies or substantial portions of the Software.
  13 *
  14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20 * OTHER DEALINGS IN THE SOFTWARE.
  21 *
  22 * Authors: AMD
  23 *
  24 */
  25
  26#include "dmub_reg.h"
  27#include "../dmub_srv.h"
  28
  29struct dmub_reg_value_masks {
  30        uint32_t value;
  31        uint32_t mask;
  32};
  33
  34static inline void
  35set_reg_field_value_masks(struct dmub_reg_value_masks *field_value_mask,
  36                          uint32_t value, uint32_t mask, uint8_t shift)
  37{
  38        field_value_mask->value =
  39                (field_value_mask->value & ~mask) | (mask & (value << shift));
  40        field_value_mask->mask = field_value_mask->mask | mask;
  41}
  42
  43static void set_reg_field_values(struct dmub_reg_value_masks *field_value_mask,
  44                                 uint32_t addr, int n, uint8_t shift1,
  45                                 uint32_t mask1, uint32_t field_value1,
  46                                 va_list ap)
  47{
  48        uint32_t shift, mask, field_value;
  49        int i = 1;
  50
  51        /* gather all bits value/mask getting updated in this register */
  52        set_reg_field_value_masks(field_value_mask, field_value1, mask1,
  53                                  shift1);
  54
  55        while (i < n) {
  56                shift = va_arg(ap, uint32_t);
  57                mask = va_arg(ap, uint32_t);
  58                field_value = va_arg(ap, uint32_t);
  59
  60                set_reg_field_value_masks(field_value_mask, field_value, mask,
  61                                          shift);
  62                i++;
  63        }
  64}
  65
  66static inline uint32_t get_reg_field_value_ex(uint32_t reg_value, uint32_t mask,
  67                                              uint8_t shift)
  68{
  69        return (mask & reg_value) >> shift;
  70}
  71
  72void dmub_reg_update(struct dmub_srv *srv, uint32_t addr, int n, uint8_t shift1,
  73                     uint32_t mask1, uint32_t field_value1, ...)
  74{
  75        struct dmub_reg_value_masks field_value_mask = { 0 };
  76        uint32_t reg_val;
  77        va_list ap;
  78
  79        va_start(ap, field_value1);
  80        set_reg_field_values(&field_value_mask, addr, n, shift1, mask1,
  81                             field_value1, ap);
  82        va_end(ap);
  83
  84        reg_val = srv->funcs.reg_read(srv->user_ctx, addr);
  85        reg_val = (reg_val & ~field_value_mask.mask) | field_value_mask.value;
  86        srv->funcs.reg_write(srv->user_ctx, addr, reg_val);
  87}
  88
  89void dmub_reg_set(struct dmub_srv *srv, uint32_t addr, uint32_t reg_val, int n,
  90                  uint8_t shift1, uint32_t mask1, uint32_t field_value1, ...)
  91{
  92        struct dmub_reg_value_masks field_value_mask = { 0 };
  93        va_list ap;
  94
  95        va_start(ap, field_value1);
  96        set_reg_field_values(&field_value_mask, addr, n, shift1, mask1,
  97                             field_value1, ap);
  98        va_end(ap);
  99
 100        reg_val = (reg_val & ~field_value_mask.mask) | field_value_mask.value;
 101        srv->funcs.reg_write(srv->user_ctx, addr, reg_val);
 102}
 103
 104void dmub_reg_get(struct dmub_srv *srv, uint32_t addr, uint8_t shift,
 105                  uint32_t mask, uint32_t *field_value)
 106{
 107        uint32_t reg_val = srv->funcs.reg_read(srv->user_ctx, addr);
 108        *field_value = get_reg_field_value_ex(reg_val, mask, shift);
 109}
 110