[PATCH 4.9 139/153] mtd: nand: ifc: Fix location of eccstat registers for IFC V1.0

Greg Kroah-Hartman
2017-03-10T09:25:27Z

From: Mark Marshall <mark.marshall@omicronenergy.com>

commit 656441478ed55d960df5f3ccdf5a0f8c61dfd0b3 upstream.

The commit 7a654172161c ("mtd/ifc: Add support for IFC controller
version 2.0") added support for version 2.0 of the IFC controller.
The version 2.0 controller has the ECC status registers at a different
location to the previous versions.

Correct the fsl_ifc_nand structure so that the ECC status can be read
from the correct location for both version 1.0 and 2.0 of the controller.

Fixes: 7a654172161c ("mtd/ifc: Add support for IFC controller version 2.0")
Signed-off-by: Mark Marshall <mark.marshall@omicronenergy.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/mtd/nand/fsl_ifc_nand.c | 8 +++++++-
include/linux/fsl_ifc.h | 8 ++++++--
2 files changed, 13 insertions(+), 3 deletions(-)

--- a/drivers/mtd/nand/fsl_ifc_nand.c
+++ b/drivers/mtd/nand/fsl_ifc_nand.c
@@ -258,9 +258,15 @@ static void fsl_ifc_run_command(struct m
int bufnum = nctrl->page & priv->bufnum_mask;
int sector = bufnum * chip->ecc.steps;
int sector_end = sector + chip->ecc.steps - 1;
+ __be32 *eccstat_regs;
+
+ if (ctrl->version >= FSL_IFC_VERSION_2_0_0)
+ eccstat_regs = ifc->ifc_nand.v2_nand_eccstat;
+ else
+ eccstat_regs = ifc->ifc_nand.v1_nand_eccstat;

for (i = sector / 4; i <= sector_end / 4; i++)
- eccstat[i] = ifc_in32(&ifc->ifc_nand.nand_eccstat[i]);
+ eccstat[i] = ifc_in32(&eccstat_regs[i]);

for (i = sector; i <= sector_end; i++) {
errors = check_read_ecc(mtd, ctrl, eccstat, i);
--- a/include/linux/fsl_ifc.h
+++ b/include/linux/fsl_ifc.h
@@ -733,8 +733,12 @@ struct fsl_ifc_nand {
__be32 nand_erattr1;
u32 res19[0x10];
__be32 nand_fsr;
- u32 res20[0x3];
- __be32 nand_eccstat[6];
+ u32 res20;
+ /* The V1 nand_eccstat is actually 4 words that overlaps the
+ * V2 nand_eccstat.
+ */
+ __be32 v1_nand_eccstat[2];
+ __be32 v2_nand_eccstat[6];
u32 res21[0x1c];
__be32 nanndcr;
u32 res22[0x2];