CRISv32: add cache flush operations
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>
diff --git a/arch/cris/arch-v32/kernel/cache.c b/arch/cris/arch-v32/kernel/cache.c
new file mode 100644
index 0000000..80da7b8
--- /dev/null
+++ b/arch/cris/arch-v32/kernel/cache.c
@@ -0,0 +1,33 @@
+#include <linux/module.h>
+#include <asm/io.h>
+#include <asm/arch/cache.h>
+#include <asm/arch/hwregs/dma.h>
+
+/* This file is used to workaround a cache bug, Guinness TR 106. */
+
+inline void flush_dma_descr(struct dma_descr_data *descr, int flush_buf)
+{
+ /* Flush descriptor to make sure we get correct in_eop and after. */
+ asm volatile ("ftagd [%0]" :: "r" (descr));
+ /* Flush buffer pointed out by descriptor. */
+ if (flush_buf)
+ cris_flush_cache_range(phys_to_virt((unsigned)descr->buf),
+ (unsigned)(descr->after - descr->buf));
+}
+EXPORT_SYMBOL(flush_dma_descr);
+
+void flush_dma_list(struct dma_descr_data *descr)
+{
+ while (1) {
+ flush_dma_descr(descr, 1);
+ if (descr->eol)
+ break;
+ descr = phys_to_virt((unsigned)descr->next);
+ }
+}
+EXPORT_SYMBOL(flush_dma_list);
+
+/* From cacheflush.S */
+EXPORT_SYMBOL(cris_flush_cache);
+/* From cacheflush.S */
+EXPORT_SYMBOL(cris_flush_cache_range);