src/device/mmio.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /* This file is part of the coreboot project. */
   3
   4 #include <assert.h>
   5 #include <device/mmio.h>
   6
   7 /* Helper functions for various MMIO access patterns. */
   8
   9 void buffer_from_fifo32(void *buffer, size_t size, void *fifo,
  10                         int fifo_stride, int fifo_width)
  11 {
  12         u8 *p = buffer;
  13         int i, j;
  14
  15         assert(fifo_width > 0 && fifo_width <= sizeof(u32) &&
  16                fifo_stride % sizeof(u32) == 0);
  17
  18         for (i = 0; i < size; i += fifo_width, fifo += fifo_stride) {
  19                 u32 val = read32(fifo);
  20                 for (j = 0; j < MIN(size - i, fifo_width); j++)
  21                         *p++ = (u8)(val >> (j * 8));
  22         }
  23 }
  24
  25 void buffer_to_fifo32_prefix(void *buffer, u32 prefix, int prefsz, size_t size,
  26                              void *fifo, int fifo_stride, int fifo_width)
  27 {
  28         u8 *p = buffer;
  29         int i, j = prefsz;
  30
  31         assert(fifo_width > 0 && fifo_width <= sizeof(u32) &&
  32                fifo_stride % sizeof(u32) == 0 && prefsz <= fifo_width);
  33
  34         uint32_t val = prefix;
  35         for (i = 0; i < size; i += fifo_width, fifo += fifo_stride) {
  36                 for (; j < MIN(size - i, fifo_width); j++)
  37                         val |= *p++ << (j * 8);
  38                 write32(fifo, val);
  39                 val = 0;
  40                 j = 0;
  41         }
  42
  43 }