| /* |
| * 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; |
| } |
| |
| } |