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/*
* This file is part of the coreboot project.
*
* Copyright 2019 Google LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <assert.h>
#include <device/mmio.h>
/* Helper functions for various MMIO access patterns. */
void buffer_from_fifo32(void *buffer, size_t size, void *fifo,
int fifo_stride, int fifo_width)
{
u8 *p = buffer;
int i, j;
assert(fifo_width > 0 && fifo_width <= sizeof(u32) &&
fifo_stride % sizeof(u32) == 0);
for (i = 0; i < size; i += fifo_width, fifo += fifo_stride) {
u32 val = read32(fifo);
for (j = 0; j < MIN(size - i, fifo_width); j++)
*p++ = (u8)(val >> (j * 8));
}
}
void buffer_to_fifo32_prefix(void *buffer, u32 prefix, int prefsz, size_t size,
void *fifo, int fifo_stride, int fifo_width)
{
u8 *p = buffer;
int i, j = prefsz;
assert(fifo_width > 0 && fifo_width <= sizeof(u32) &&
fifo_stride % sizeof(u32) == 0 && prefsz <= fifo_width);
uint32_t val = prefix;
for (i = 0; i < size; i += fifo_width, fifo += fifo_stride) {
for (; j < MIN(size - i, fifo_width); j++)
val |= *p++ << (j * 8);
write32(fifo, val);
val = 0;
j = 0;
}
}
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