CRISv32: add cache flush operations

[sfrench/cifs-2.6.git] / arch / cris / arch-v32 / kernel / cache.c

diff --git a/arch/cris/arch-v32/kernel/cache.c b/arch/cris/arch-v32/kernel/cache.c
new file mode 100644 (file)
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);