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From: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Date: Fri, 20 Nov 2015 20:36:08 +0100
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Subject: [PATCH v2 15/19] mtd: nand_mrvl_nfc: Add support for 8bit BCH HW ECC
To: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>, barebox@lists.infradead.org
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Add support for 8bit HW ECC modes supported by later IP versions.
Signed-off-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Tested-by: Robert Jarzmik <robert.jarzmik@free.fr>
---
drivers/mtd/nand/nand_mrvl_nfc.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/drivers/mtd/nand/nand_mrvl_nfc.c b/drivers/mtd/nand/nand_mrvl_nfc.c
index 3e9fccdffefe..f43200dcf2c7 100644
--- a/drivers/mtd/nand/nand_mrvl_nfc.c
+++ b/drivers/mtd/nand/nand_mrvl_nfc.c
@@ -252,6 +252,17 @@ static struct nand_ecclayout ecc_layout_4KB_bch4bit = {
.oobfree = { {1, 4}, {6, 26}, {64, 32} }
};
+static struct nand_ecclayout ecc_layout_4KB_bch8bit = {
+ .eccbytes = 64,
+ .eccpos = {
+ 32, 33, 34, 35, 36, 37, 38, 39,
+ 40, 41, 42, 43, 44, 45, 46, 47,
+ 48, 49, 50, 51, 52, 53, 54, 55,
+ 56, 57, 58, 59, 60, 61, 62, 63},
+ /* Bootrom looks in bytes 0 & 5 for bad blocks */
+ .oobfree = { {1, 4}, {6, 26} }
+};
+
#define NDTR0_tCH(c) (min((c), 7) << 19)
#define NDTR0_tCS(c) (min((c), 7) << 16)
#define NDTR0_tWH(c) (min((c), 7) << 11)
@@ -928,6 +939,31 @@ static int pxa_ecc_strength4(struct mrvl_nand_host *host,
return -ENODEV;
}
+static int pxa_ecc_strength8(struct mrvl_nand_host *host,
+ struct nand_ecc_ctrl *ecc, int ecc_stepsize, int page_size)
+{
+ if (!(host->hwflags & HWFLAGS_ECC_BCH))
+ return -ENODEV;
+
+ /*
+ * Required ECC: 8-bit correction per 512 bytes
+ * Select: 16-bit correction per 1024 bytes
+ */
+ if (ecc_stepsize == 512 && page_size == 4096) {
+ host->chunk_size = 1024;
+ host->spare_size = 0;
+ host->ecc_size = 32;
+ host->ecc_bch = 1;
+ ecc->mode = NAND_ECC_HW;
+ ecc->size = 1024;
+ ecc->layout = &ecc_layout_4KB_bch8bit;
+ ecc->strength = 16;
+ return 0;
+ }
+
+ return -ENODEV;
+}
+
static int pxa_ecc_init(struct mrvl_nand_host *host,
struct nand_ecc_ctrl *ecc,
int strength, int ecc_stepsize, int page_size)
@@ -941,6 +977,9 @@ static int pxa_ecc_init(struct mrvl_nand_host *host,
case 4:
ret = pxa_ecc_strength4(host, ecc, ecc_stepsize, page_size);
break;
+ case 8:
+ ret = pxa_ecc_strength8(host, ecc, ecc_stepsize, page_size);
+ break;
}
if (ret) {
--
2.1.4
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