1 files changed, 99 insertions, 3 deletions

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 49c3349f55..74e5fea667 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -47,10 +47,105 @@ int __board_mmc_getcd(struct mmc *mmc) {
 int board_mmc_getcd(struct mmc *mmc)__attribute__((weak,
 	alias("__board_mmc_getcd")));
 
+#ifdef CONFIG_MMC_BOUNCE_BUFFER
+static int mmc_bounce_need_bounce(struct mmc_data *orig)
+{
+	ulong addr, len;
+
+	if (orig->flags & MMC_DATA_READ)
+		addr = (ulong)orig->dest;
+	else
+		addr = (ulong)orig->src;
+
+	if (addr % ARCH_DMA_MINALIGN) {
+		debug("MMC: Unaligned data destination address %08lx!\n", addr);
+		return 1;
+	}
+
+	len = (ulong)(orig->blocksize * orig->blocks);
+	if (len % ARCH_DMA_MINALIGN) {
+		debug("MMC: Unaligned data destination length %08lx!\n", len);
+		return 1;
+	}
+
+	return 0;
+}
+
+static int mmc_bounce_buffer_start(struct mmc_data *backup,
+					struct mmc_data *orig)
+{
+	ulong origlen, len;
+	void *buffer;
+
+	if (!orig)
+		return 0;
+
+	if (!mmc_bounce_need_bounce(orig))
+		return 0;
+
+	memcpy(backup, orig, sizeof(struct mmc_data));
+
+	origlen = orig->blocksize * orig->blocks;
+	len = roundup(origlen, ARCH_DMA_MINALIGN);
+	buffer = memalign(ARCH_DMA_MINALIGN, len);
+	if (!buffer) {
+		puts("MMC: Error allocating MMC bounce buffer!\n");
+		return 1;
+	}
+
+	if (orig->flags & MMC_DATA_READ) {
+		orig->dest = buffer;
+	} else {
+		memcpy(buffer, orig->src, origlen);
+		orig->src = buffer;
+	}
+
+	return 0;
+}
+
+static void mmc_bounce_buffer_stop(struct mmc_data *backup,
+					struct mmc_data *orig)
+{
+	ulong len;
+
+	if (!orig)
+		return;
+
+	if (!mmc_bounce_need_bounce(backup))
+		return;
+
+	if (backup->flags & MMC_DATA_READ) {
+		len = backup->blocksize * backup->blocks;
+		memcpy(backup->dest, orig->dest, len);
+		free(orig->dest);
+		orig->dest = backup->dest;
+	} else {
+		free((void *)orig->src);
+		orig->src = backup->src;
+	}
+
+	return;
+
+}
+#else
+static inline int mmc_bounce_buffer_start(struct mmc_data *backup,
+					struct mmc_data *orig) { }
+static inline void mmc_bounce_buffer_stop(struct mmc_data *backup,
+					struct mmc_data *orig) { }
+#endif
+
 int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
 {
-#ifdef CONFIG_MMC_TRACE
+	struct mmc_data backup;
 	int ret;
+
+	memset(&backup, 0, sizeof(backup));
+
+	ret = mmc_bounce_buffer_start(&backup, data);
+	if (ret)
+		return ret;
+
+#ifdef CONFIG_MMC_TRACE
 	int i;
 	u8 *ptr;
 
@@ -99,10 +194,11 @@ int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, struct mmc_data *data)
 			printf("\t\tERROR MMC rsp not supported\n");
 			break;
 	}
-	return ret;
 #else
-	return mmc->send_cmd(mmc, cmd, data);
+	ret = mmc->send_cmd(mmc, cmd, data);
 #endif
+	mmc_bounce_buffer_stop(&backup, data);
+	return ret;
 }
 
 int mmc_send_status(struct mmc *mmc, int timeout)