57c230a873
These are needed due to a cache bug, and can be used to make sure that the DMA descriptors are flushed to memory and can be safely handled by DMA. flush_dma_descr - Flush one DMA descriptor. flush_dma_list - Flush a complete list of DMA descriptors. cris_flush_cache - Flush the complete cache. cris_flush_cache_range - Flush only the specified range Signed-off-by: Jesper Nilsson <jesper.nilsson@axis.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
33 lines
896 B
C
33 lines
896 B
C
#include <linux/module.h>
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#include <asm/io.h>
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#include <asm/arch/cache.h>
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#include <asm/arch/hwregs/dma.h>
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/* This file is used to workaround a cache bug, Guinness TR 106. */
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inline void flush_dma_descr(struct dma_descr_data *descr, int flush_buf)
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{
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/* Flush descriptor to make sure we get correct in_eop and after. */
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asm volatile ("ftagd [%0]" :: "r" (descr));
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/* Flush buffer pointed out by descriptor. */
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if (flush_buf)
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cris_flush_cache_range(phys_to_virt((unsigned)descr->buf),
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(unsigned)(descr->after - descr->buf));
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}
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EXPORT_SYMBOL(flush_dma_descr);
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void flush_dma_list(struct dma_descr_data *descr)
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{
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while (1) {
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flush_dma_descr(descr, 1);
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if (descr->eol)
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break;
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descr = phys_to_virt((unsigned)descr->next);
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}
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}
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EXPORT_SYMBOL(flush_dma_list);
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/* From cacheflush.S */
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EXPORT_SYMBOL(cris_flush_cache);
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/* From cacheflush.S */
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EXPORT_SYMBOL(cris_flush_cache_range);
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