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https://gitee.com/Vancouver2017/luban-lite-t3e-pro.git
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91 lines
2.6 KiB
C
91 lines
2.6 KiB
C
// SPDX-License-Identifier: Apache-2.0
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#include <string.h>
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#include "aic_core.h"
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#include "bouncebuf.h"
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#define BOUNCE_BUF_ALIGN CACHE_LINE_SIZE
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#define debug pr_debug
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static int bounce_buffer_addr_aligned(struct bounce_buffer *state)
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{
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const ulong align_mask = BOUNCE_BUF_ALIGN - 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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pr_debug("Unaligned buffer address 0x%x\n", (u32)(ptr_t)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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pr_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 = aicos_malloc_align(0, state->len_aligned, alignment);
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if (!state->bounce_buffer)
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return -1;
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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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aicos_dcache_clean_invalid_range((unsigned long *)state->bounce_buffer,
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state->len_aligned);
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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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BOUNCE_BUF_ALIGN,
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bounce_buffer_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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aicos_dma_sync();
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/* Invalidate cache so that CPU can see any newly DMA'd data */
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aicos_dcache_invalid_range((unsigned long *)state->bounce_buffer,
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state->len_aligned);
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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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aicos_free_align(0, state->bounce_buffer);
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return 0;
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}
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