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authorMasahiro Yamada <yamada.masahiro@socionext.com>2017-06-13 22:45:46 +0900
committerBoris Brezillon <boris.brezillon@free-electrons.com>2017-06-20 09:14:48 +0200
commit57a4d8b5f6482718f17c08f2cdfea085b1d3c12a (patch)
tree7e8f41cb171f3103220e3bc300572f388878eaf5 /drivers/mtd
parent26d266e10e5eb59cfbcc47922655dc3149e1bd59 (diff)
downloadblackbird-op-linux-57a4d8b5f6482718f17c08f2cdfea085b1d3c12a.tar.gz
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mtd: nand: denali: support hardware-assisted erased page detection
Recent versions of this IP support automatic erased page detection. If an erased page is detected on reads, the controller does not set INTR__ECC_UNCOR_ERR, but INTR__ERASED_PAGE. The detection of erased pages is based on the number of zeros in a page; if the number of zeros is less than the value in the field ERASED_THRESHOLD, the page is assumed as erased. Please note ERASED_THRESHOLD specifies the number of zeros in a _page_ instead of an ECC chunk. Moreover, the controller does not provide a way to know the actual number of bitflips. Actually, an erased page (all 0xff) is not an ECC correctable pattern on the Denali ECC engine. In other words, there may be overlap between the following two: [1] a bit pattern reachable from a valid payload + ECC pattern within ecc.strength bitflips [2] a bit pattern reachable from an erased state (all 0xff) within ecc.strength bitflips So, this feature may intercept ECC correctable patterns, then replace [1] with [2]. After all, this feature can work safely only when ECC_THRESHOLD == 1, i.e. detect erased pages without any bitflips. This should be the case most of the time. If there is a bitflip or more, the driver will fallback to the software method by using nand_check_erased_ecc_chunk(). Strangely enough, the driver still has to fill the buffer with 0xff in case of INTR__ERASED_PAGE because the ECC correction engine has already manipulated the data in the buffer before it judges erased pages. Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/nand/denali.c9
-rw-r--r--drivers/mtd/nand/denali.h5
2 files changed, 13 insertions, 1 deletions
diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index ed0044c560e5..e8d8e6c6f45e 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -560,6 +560,9 @@ static int denali_pio_read(struct denali_nand_info *denali, void *buf,
if (!(irq_status & INTR__PAGE_XFER_INC))
return -EIO;
+ if (irq_status & INTR__ERASED_PAGE)
+ memset(buf, 0xff, size);
+
return irq_status & ecc_err_mask ? -EBADMSG : 0;
}
@@ -635,6 +638,9 @@ static int denali_dma_xfer(struct denali_nand_info *denali, void *buf,
denali_enable_dma(denali, false);
dma_sync_single_for_cpu(denali->dev, dma_addr, size, dir);
+ if (irq_status & INTR__ERASED_PAGE)
+ memset(buf, 0xff, size);
+
return ret;
}
@@ -1406,7 +1412,8 @@ int denali_init(struct denali_nand_info *denali)
"chosen ECC settings: step=%d, strength=%d, bytes=%d\n",
chip->ecc.size, chip->ecc.strength, chip->ecc.bytes);
- iowrite32(chip->ecc.strength, denali->flash_reg + ECC_CORRECTION);
+ iowrite32(MAKE_ECC_CORRECTION(chip->ecc.strength, 1),
+ denali->flash_reg + ECC_CORRECTION);
iowrite32(mtd->erasesize / mtd->writesize,
denali->flash_reg + PAGES_PER_BLOCK);
iowrite32(chip->options & NAND_BUSWIDTH_16 ? 1 : 0,
diff --git a/drivers/mtd/nand/denali.h b/drivers/mtd/nand/denali.h
index f5da52f09e34..657a794af695 100644
--- a/drivers/mtd/nand/denali.h
+++ b/drivers/mtd/nand/denali.h
@@ -110,6 +110,10 @@
#define ECC_CORRECTION 0x1b0
#define ECC_CORRECTION__VALUE GENMASK(4, 0)
+#define ECC_CORRECTION__ERASE_THRESHOLD GENMASK(31, 16)
+#define MAKE_ECC_CORRECTION(val, thresh) \
+ (((val) & (ECC_CORRECTION__VALUE)) | \
+ (((thresh) << 16) & (ECC_CORRECTION__ERASE_THRESHOLD)))
#define READ_MODE 0x1c0
#define READ_MODE__VALUE GENMASK(3, 0)
@@ -233,6 +237,7 @@
#define INTR__RST_COMP BIT(13)
#define INTR__PIPE_CMD_ERR BIT(14)
#define INTR__PAGE_XFER_INC BIT(15)
+#define INTR__ERASED_PAGE BIT(16)
#define PAGE_CNT(bank) (0x430 + (bank) * 0x50)
#define ERR_PAGE_ADDR(bank) (0x440 + (bank) * 0x50)
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