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authorMarek Vasut <marex@denx.de>2012-03-15 18:33:19 +0000
committerAlbert ARIBAUD <albert.u.boot@aribaud.net>2012-03-29 07:56:28 +0200
commit6b9408edd3f6af6e91bcc0eebd4aedc0aca28934 (patch)
tree9f6183068cad9ff02c9d3d65445d3abf97306f25 /drivers
parentc3dfe7077630aa5f81d499c08964005d204c2b3b (diff)
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i.MX28: Add cache support to MXS NAND driver
Signed-off-by: Marek Vasut <marex@denx.de> Cc: Stefano Babic <sbabic@denx.de>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/mtd/nand/mxs_nand.c53
1 files changed, 50 insertions, 3 deletions
diff --git a/drivers/mtd/nand/mxs_nand.c b/drivers/mtd/nand/mxs_nand.c
index ce2a326..4b1297a 100644
--- a/drivers/mtd/nand/mxs_nand.c
+++ b/drivers/mtd/nand/mxs_nand.c
@@ -50,6 +50,7 @@ struct mxs_nand_info {
int cur_chip;
uint32_t cmd_queue_len;
+ uint32_t data_buf_size;
uint8_t *cmd_buf;
uint8_t *data_buf;
@@ -73,6 +74,36 @@ struct mxs_nand_info {
struct nand_ecclayout fake_ecc_layout;
+/*
+ * Cache management functions
+ */
+#ifndef CONFIG_SYS_DCACHE_OFF
+static void mxs_nand_flush_data_buf(struct mxs_nand_info *info)
+{
+ uint32_t addr = (uint32_t)info->data_buf;
+
+ flush_dcache_range(addr, addr + info->data_buf_size);
+}
+
+static void mxs_nand_inval_data_buf(struct mxs_nand_info *info)
+{
+ uint32_t addr = (uint32_t)info->data_buf;
+
+ invalidate_dcache_range(addr, addr + info->data_buf_size);
+}
+
+static void mxs_nand_flush_cmd_buf(struct mxs_nand_info *info)
+{
+ uint32_t addr = (uint32_t)info->cmd_buf;
+
+ flush_dcache_range(addr, addr + MXS_NAND_COMMAND_BUFFER_SIZE);
+}
+#else
+static inline void mxs_nand_flush_data_buf(struct mxs_nand_info *info) {}
+static inline void mxs_nand_inval_data_buf(struct mxs_nand_info *info) {}
+static inline void mxs_nand_flush_cmd_buf(struct mxs_nand_info *info) {}
+#endif
+
static struct mxs_dma_desc *mxs_nand_get_dma_desc(struct mxs_nand_info *info)
{
struct mxs_dma_desc *desc;
@@ -286,6 +317,9 @@ static void mxs_nand_cmd_ctrl(struct mtd_info *mtd, int data, unsigned int ctrl)
mxs_dma_desc_append(channel, d);
+ /* Flush caches */
+ mxs_nand_flush_cmd_buf(nand_info);
+
/* Execute the DMA chain. */
ret = mxs_dma_go(channel);
if (ret)
@@ -435,6 +469,9 @@ static void mxs_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int length)
goto rtn;
}
+ /* Invalidate caches */
+ mxs_nand_inval_data_buf(nand_info);
+
memcpy(buf, nand_info->data_buf, length);
rtn:
@@ -484,6 +521,9 @@ static void mxs_nand_write_buf(struct mtd_info *mtd, const uint8_t *buf,
mxs_dma_desc_append(channel, d);
+ /* Flush caches */
+ mxs_nand_flush_data_buf(nand_info);
+
/* Execute the DMA chain. */
ret = mxs_dma_go(channel);
if (ret)
@@ -600,6 +640,9 @@ static int mxs_nand_ecc_read_page(struct mtd_info *mtd, struct nand_chip *nand,
goto rtn;
}
+ /* Invalidate caches */
+ mxs_nand_inval_data_buf(nand_info);
+
/* Read DMA completed, now do the mark swapping. */
mxs_nand_swap_block_mark(mtd, nand_info->data_buf, nand_info->oob_buf);
@@ -687,6 +730,9 @@ static void mxs_nand_ecc_write_page(struct mtd_info *mtd,
mxs_dma_desc_append(channel, d);
+ /* Flush caches */
+ mxs_nand_flush_data_buf(nand_info);
+
/* Execute the DMA chain. */
ret = mxs_dma_go(channel);
if (ret) {
@@ -978,18 +1024,19 @@ int mxs_nand_alloc_buffers(struct mxs_nand_info *nand_info)
uint8_t *buf;
const int size = NAND_MAX_PAGESIZE + NAND_MAX_OOBSIZE;
+ nand_info->data_buf_size = roundup(size, MXS_DMA_ALIGNMENT);
+
/* DMA buffers */
- buf = memalign(MXS_DMA_ALIGNMENT, size);
+ buf = memalign(MXS_DMA_ALIGNMENT, nand_info->data_buf_size);
if (!buf) {
printf("MXS NAND: Error allocating DMA buffers\n");
return -ENOMEM;
}
- memset(buf, 0, size);
+ memset(buf, 0, nand_info->data_buf_size);
nand_info->data_buf = buf;
nand_info->oob_buf = buf + NAND_MAX_PAGESIZE;
-
/* Command buffers */
nand_info->cmd_buf = memalign(MXS_DMA_ALIGNMENT,
MXS_NAND_COMMAND_BUFFER_SIZE);