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

   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);