src/device/mmio.c

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