diff options
Diffstat (limited to 'qemu/roms/u-boot/common/bouncebuf.c')
-rw-r--r-- | qemu/roms/u-boot/common/bouncebuf.c | 83 |
1 files changed, 0 insertions, 83 deletions
diff --git a/qemu/roms/u-boot/common/bouncebuf.c b/qemu/roms/u-boot/common/bouncebuf.c deleted file mode 100644 index 9eece6d75..000000000 --- a/qemu/roms/u-boot/common/bouncebuf.c +++ /dev/null @@ -1,83 +0,0 @@ -/* - * Generic bounce buffer implementation - * - * Copyright (C) 2012 Marek Vasut <marex@denx.de> - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#include <common.h> -#include <malloc.h> -#include <errno.h> -#include <bouncebuf.h> - -static int addr_aligned(struct bounce_buffer *state) -{ - const ulong align_mask = ARCH_DMA_MINALIGN - 1; - - /* Check if start is aligned */ - if ((ulong)state->user_buffer & align_mask) { - debug("Unaligned buffer address %p\n", state->user_buffer); - return 0; - } - - /* Check if length is aligned */ - if (state->len != state->len_aligned) { - debug("Unaligned buffer length %d\n", state->len); - return 0; - } - - /* Aligned */ - return 1; -} - -int bounce_buffer_start(struct bounce_buffer *state, void *data, - size_t len, unsigned int flags) -{ - state->user_buffer = data; - state->bounce_buffer = data; - state->len = len; - state->len_aligned = roundup(len, ARCH_DMA_MINALIGN); - state->flags = flags; - - if (!addr_aligned(state)) { - state->bounce_buffer = memalign(ARCH_DMA_MINALIGN, - state->len_aligned); - if (!state->bounce_buffer) - return -ENOMEM; - - if (state->flags & GEN_BB_READ) - memcpy(state->bounce_buffer, state->user_buffer, - state->len); - } - - /* - * Flush data to RAM so DMA reads can pick it up, - * and any CPU writebacks don't race with DMA writes - */ - flush_dcache_range((unsigned long)state->bounce_buffer, - (unsigned long)(state->bounce_buffer) + - state->len_aligned); - - return 0; -} - -int bounce_buffer_stop(struct bounce_buffer *state) -{ - if (state->flags & GEN_BB_WRITE) { - /* Invalidate cache so that CPU can see any newly DMA'd data */ - invalidate_dcache_range((unsigned long)state->bounce_buffer, - (unsigned long)(state->bounce_buffer) + - state->len_aligned); - } - - if (state->bounce_buffer == state->user_buffer) - return 0; - - if (state->flags & GEN_BB_WRITE) - memcpy(state->user_buffer, state->bounce_buffer, state->len); - - free(state->bounce_buffer); - - return 0; -} |