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  • Committer: Suren A. Chilingaryan
  • Date: 2011-12-08 02:47:23 UTC
  • Revision ID: csa@dside.dyndns.org-20111208024723-ym9uf3uoll6ym2a9
new event architecture, first trial

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Lines of Context:
dma/nwl_engine.c
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}
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int dma_nwl_stream_read(pcilib_dma_context_t *vctx, pcilib_dma_engine_t dma, uintptr_t addr, size_t size, pcilib_dma_flags_t flags, pcilib_timeout_t timeout, pcilib_dma_callback_t cb, void *cbattr) {
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    int err, ret = 1;
 
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    int err, ret = PCILIB_STREAMING_REQ_PACKET;
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    size_t res = 0;
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    size_t bufnum;
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    size_t bufsize;
 
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    pcilib_timeout_t wait;
 
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    nwl_dma_t *ctx = (nwl_dma_t*)vctx;
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    size_t buf_size;
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    if (err) return err;
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    do {
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        if (ret > 2) {
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            bufnum = dma_nwl_wait_buffer(ctx, info, &bufsize, &eop, 0);
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            if (bufnum == PCILIB_DMA_BUFFER_INVALID) return 0;
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        } else {
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            bufnum = dma_nwl_wait_buffer(ctx, info, &bufsize, &eop, timeout);
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            if (bufnum == PCILIB_DMA_BUFFER_INVALID) {
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                if (ret == 1) return PCILIB_ERROR_TIMEOUT;
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                return 0;
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            }
 
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        switch (ret&PCILIB_STREAMING_TIMEOUT_MASK) {
 
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            case PCILIB_STREAMING_CONTINUE: wait = PCILIB_DMA_TIMEOUT; break;
 
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            case PCILIB_STREAMING_WAIT: wait = timeout; break;
 
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            case PCILIB_STREAMING_CHECK: wait = 0; break;
 
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        }
 
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        bufnum = dma_nwl_wait_buffer(ctx, info, &bufsize, &eop, wait);
 
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        if (bufnum == PCILIB_DMA_BUFFER_INVALID) {
 
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            return (ret&PCILIB_STREAMING_FAIL)?PCILIB_ERROR_TIMEOUT:0;
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        }
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            // EOP is not respected in IPE Camera
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        ret = cb(cbattr, (eop?PCILIB_DMA_FLAG_EOP:0), bufsize, buf);
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//      DS: Fixme, it looks like we can avoid calling this for the sake of performance
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//      pcilib_kmem_sync_block(ctx->pcilib, info->pages, PCILIB_KMEM_SYNC_TODEVICE, bufnum);
 
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        dma_nwl_return_buffer(ctx, info);
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        if (ret < 0) return -ret;
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        dma_nwl_return_buffer(ctx, info);
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        res += bufsize;
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