From 98450d0220eea0ab32385063e2e27fb1eb92a746 Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Mon, 9 Jan 2012 13:20:40 +0000 Subject: [PATCH] tegra: mmc: Support operation with dcache enabled When the data cache is enabled we must flush on write and invalidate on read. We also check that buffers are aligned to data cache lines boundaries. With recent work in U-Boot this should generally be the case but the warnings will catch problems. Signed-off-by: Simon Glass Acked-by: Stephen Warren Signed-off-by: Tom Warren --- drivers/mmc/tegra2_mmc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/mmc/tegra2_mmc.c b/drivers/mmc/tegra2_mmc.c index 5b4c9f69a1..3191557c5b 100644 --- a/drivers/mmc/tegra2_mmc.c +++ b/drivers/mmc/tegra2_mmc.c @@ -114,6 +114,14 @@ static void mmc_set_transfer_mode(struct mmc_host *host, struct mmc_data *data) if (data->flags & MMC_DATA_READ) mode |= TEGRA_MMC_TRNMOD_DATA_XFER_DIR_SEL_READ; + if (data->flags & MMC_DATA_WRITE) { + if ((uintptr_t)data->src & (ARCH_DMA_MINALIGN - 1)) + printf("Warning: unaligned write to %p may fail\n", + data->src); + flush_dcache_range((ulong)data->src, (ulong)data->src + + data->blocks * data->blocksize); + } + writew(mode, &host->reg->trnmod); } @@ -310,6 +318,14 @@ static int mmc_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd, } } writel(mask, &host->reg->norintsts); + if (data->flags & MMC_DATA_READ) { + if ((uintptr_t)data->dest & (ARCH_DMA_MINALIGN - 1)) + printf("Warning: unaligned read from %p " + "may fail\n", data->dest); + invalidate_dcache_range((ulong)data->dest, + (ulong)data->dest + + data->blocks * data->blocksize); + } } udelay(1000); -- 2.30.2