summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/nand/gpmi-nand
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/mtd/nand/gpmi-nand')
-rw-r--r--drivers/mtd/nand/gpmi-nand/gpmi-nand.c28
-rw-r--r--drivers/mtd/nand/gpmi-nand/gpmi-nand.h4
2 files changed, 30 insertions, 2 deletions
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index 25216785f180..717881a3d1b8 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -94,6 +94,25 @@ static inline int get_ecc_strength(struct gpmi_nand_data *this)
return round_down(ecc_strength, 2);
}
+static inline bool gpmi_check_ecc(struct gpmi_nand_data *this)
+{
+ struct bch_geometry *geo = &this->bch_geometry;
+
+ /* Do the sanity check. */
+ if (GPMI_IS_MX23(this) || GPMI_IS_MX28(this)) {
+ /* The mx23/mx28 only support the GF13. */
+ if (geo->gf_len == 14)
+ return false;
+
+ if (geo->ecc_strength > MXS_ECC_STRENGTH_MAX)
+ return false;
+ } else if (GPMI_IS_MX6Q(this)) {
+ if (geo->ecc_strength > MX6_ECC_STRENGTH_MAX)
+ return false;
+ }
+ return true;
+}
+
int common_nfc_set_geometry(struct gpmi_nand_data *this)
{
struct bch_geometry *geo = &this->bch_geometry;
@@ -123,8 +142,13 @@ int common_nfc_set_geometry(struct gpmi_nand_data *this)
/* We use the same ECC strength for all chunks. */
geo->ecc_strength = get_ecc_strength(this);
- if (!geo->ecc_strength) {
- pr_err("wrong ECC strength.\n");
+ if (!gpmi_check_ecc(this)) {
+ dev_err(this->dev,
+ "We can not support this nand chip."
+ " Its required ecc strength(%d) is beyond our"
+ " capability(%d).\n", geo->ecc_strength,
+ (GPMI_IS_MX6Q(this) ? MX6_ECC_STRENGTH_MAX
+ : MXS_ECC_STRENGTH_MAX));
return -EINVAL;
}
diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
index 3d93a5e39090..072947731277 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.h
@@ -284,6 +284,10 @@ extern int gpmi_read_page(struct gpmi_nand_data *,
#define STATUS_ERASED 0xff
#define STATUS_UNCORRECTABLE 0xfe
+/* BCH's bit correction capability. */
+#define MXS_ECC_STRENGTH_MAX 20 /* mx23 and mx28 */
+#define MX6_ECC_STRENGTH_MAX 40
+
/* Use the platform_id to distinguish different Archs. */
#define IS_MX23 0x0
#define IS_MX28 0x1