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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Generic bounce buffer implementation
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*
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* Copyright (C) 2012 Marek Vasut <marex@denx.de>
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*/
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#include <cpu_func.h>
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#include <log.h>
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#include <malloc.h>
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#include <errno.h>
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#include <bouncebuf.h>
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#include <asm/cache.h>
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#include <linux/dma-mapping.h>
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static int addr_aligned(struct bounce_buffer *state)
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{
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const ulong align_mask = ARCH_DMA_MINALIGN - 1;
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/* Check if start is aligned */
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if ((ulong)state->user_buffer & align_mask) {
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debug("Unaligned buffer address %p\n", state->user_buffer);
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return 0;
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}
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/* Check if length is aligned */
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if (state->len != state->len_aligned) {
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debug("Unaligned buffer length %zu\n", state->len);
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return 0;
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}
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/* Aligned */
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return 1;
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}
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int bounce_buffer_start_extalign(struct bounce_buffer *state, void *data,
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size_t len, unsigned int flags,
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size_t alignment,
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int (*addr_is_aligned)(struct bounce_buffer *state))
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{
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state->user_buffer = data;
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state->bounce_buffer = data;
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state->len = len;
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state->len_aligned = roundup(len, alignment);
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state->flags = flags;
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if (!addr_is_aligned(state)) {
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state->bounce_buffer = memalign(alignment,
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state->len_aligned);
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if (!state->bounce_buffer)
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return -ENOMEM;
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if (state->flags & GEN_BB_READ)
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memcpy(state->bounce_buffer, state->user_buffer,
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state->len);
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}
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/*
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* Flush data to RAM so DMA reads can pick it up,
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* and any CPU writebacks don't race with DMA writes
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*/
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dma_map_single(state->bounce_buffer,
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state->len_aligned,
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DMA_BIDIRECTIONAL);
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return 0;
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}
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int bounce_buffer_start(struct bounce_buffer *state, void *data,
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size_t len, unsigned int flags)
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{
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return bounce_buffer_start_extalign(state, data, len, flags,
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ARCH_DMA_MINALIGN,
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addr_aligned);
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}
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int bounce_buffer_stop(struct bounce_buffer *state)
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{
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if (state->flags & GEN_BB_WRITE) {
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/* Invalidate cache so that CPU can see any newly DMA'd data */
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dma_unmap_single((dma_addr_t)(uintptr_t)state->bounce_buffer,
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state->len_aligned,
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DMA_BIDIRECTIONAL);
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}
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if (state->bounce_buffer == state->user_buffer)
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return 0;
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if (state->flags & GEN_BB_WRITE)
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memcpy(state->user_buffer, state->bounce_buffer, state->len);
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free(state->bounce_buffer);
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return 0;
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}
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