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Linux/arch/cris/arch-v32/kernel/cache.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <linux/module.h>
  3 #include <asm/io.h>
  4 #include <arch/cache.h>
  5 #include <arch/hwregs/dma.h>
  6 
  7 /* This file is used to workaround a cache bug, Guinness TR 106. */
  8 
  9 inline void flush_dma_descr(struct dma_descr_data *descr, int flush_buf)
 10 {
 11         /* Flush descriptor to make sure we get correct in_eop and after. */
 12         asm volatile ("ftagd [%0]" :: "r" (descr));
 13         /* Flush buffer pointed out by descriptor. */
 14         if (flush_buf)
 15                 cris_flush_cache_range(phys_to_virt((unsigned)descr->buf),
 16                                 (unsigned)(descr->after - descr->buf));
 17 }
 18 EXPORT_SYMBOL(flush_dma_descr);
 19 
 20 void flush_dma_list(struct dma_descr_data *descr)
 21 {
 22         while (1) {
 23                 flush_dma_descr(descr, 1);
 24                 if (descr->eol)
 25                         break;
 26                 descr = phys_to_virt((unsigned)descr->next);
 27         }
 28 }
 29 EXPORT_SYMBOL(flush_dma_list);
 30 
 31 /* From cacheflush.S */
 32 EXPORT_SYMBOL(cris_flush_cache);
 33 /* From cacheflush.S */
 34 EXPORT_SYMBOL(cris_flush_cache_range);
 35 

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