mtd: onenand: switch to mtd_ooblayout_ops

Implementing the mtd_ooblayout_ops interface is the new way of exposing
ECC/OOB layout to MTD users. Modify the onenand drivers to switch to this
approach.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

2 files changed, 97 insertions, 67 deletions

diff --git a/drivers/mtd/onenand/onenand_base.c b/drivers/mtd/onenand/onenand_base.c
index d0fa505d40bd..a4b029a417f0 100644
--- a/drivers/mtd/onenand/onenand_base.c
+++ b/drivers/mtd/onenand/onenand_base.c
@@ -68,21 +68,33 @@ MODULE_PARM_DESC(otp,	"Corresponding behaviour of OneNAND in OTP"
  * flexonenand_oob_128 - oob info for Flex-Onenand with 4KB page
  * For now, we expose only 64 out of 80 ecc bytes
  */
-static struct nand_ecclayout flexonenand_oob_128 = {
-        .eccbytes       = 64,
-        .eccpos         = {
-                6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
-                22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
-                38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
-                54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
-                70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
-                86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
-                102, 103, 104, 105
-                },
-        .oobfree        = {
-                {2, 4}, {18, 4}, {34, 4}, {50, 4},
-                {66, 4}, {82, 4}, {98, 4}, {114, 4}
-        }
+static int flexonenand_ooblayout_ecc(struct mtd_info *mtd, int section,
+                                     struct mtd_oob_region *oobregion)
+{
+        if (section > 7)
+                return -ERANGE;
+
+        oobregion->offset = (section * 16) + 6;
+        oobregion->length = 10;
+
+        return 0;
+}
+
+static int flexonenand_ooblayout_free(struct mtd_info *mtd, int section,
+                                      struct mtd_oob_region *oobregion)
+{
+        if (section > 7)
+                return -ERANGE;
+
+        oobregion->offset = (section * 16) + 2;
+        oobregion->length = 4;
+
+        return 0;
+}
+
+static const struct mtd_ooblayout_ops flexonenand_ooblayout_ops = {
+        .ecc = flexonenand_ooblayout_ecc,
+        .free = flexonenand_ooblayout_free,
 };
 
 /*
@@ -91,56 +103,77 @@ static struct nand_ecclayout flexonenand_oob_128 = {
  * Based on specification:
  * 4Gb M-die OneNAND Flash (KFM4G16Q4M, KFN8G16Q4M). Rev. 1.3, Apr. 2010
  *
- * For eccpos we expose only 64 bytes out of 72 (see struct nand_ecclayout)
- *
- * oobfree uses the spare area fields marked as
- * "Managed by internal ECC logic for Logical Sector Number area"
- */
-static struct nand_ecclayout onenand_oob_128 = {
-        .eccbytes       = 64,
-        .eccpos         = {
-                7, 8, 9, 10, 11, 12, 13, 14, 15,
-                23, 24, 25, 26, 27, 28, 29, 30, 31,
-                39, 40, 41, 42, 43, 44, 45, 46, 47,
-                55, 56, 57, 58, 59, 60, 61, 62, 63,
-                71, 72, 73, 74, 75, 76, 77, 78, 79,
-                87, 88, 89, 90, 91, 92, 93, 94, 95,
-                103, 104, 105, 106, 107, 108, 109, 110, 111,
-                119
-        },
-        .oobfree        = {
-                {2, 3}, {18, 3}, {34, 3}, {50, 3},
-                {66, 3}, {82, 3}, {98, 3}, {114, 3}
-        }
+ */
+static int onenand_ooblayout_128_ecc(struct mtd_info *mtd, int section,
+                                     struct mtd_oob_region *oobregion)
+{
+        if (section > 7)
+                return -ERANGE;
+
+        oobregion->offset = (section * 16) + 7;
+        oobregion->length = 9;
+
+        return 0;
+}
+
+static int onenand_ooblayout_128_free(struct mtd_info *mtd, int section,
+                                      struct mtd_oob_region *oobregion)
+{
+        if (section >= 8)
+                return -ERANGE;
+
+        /*
+         * free bytes are using the spare area fields marked as
+         * "Managed by internal ECC logic for Logical Sector Number area"
+         */
+        oobregion->offset = (section * 16) + 2;
+        oobregion->length = 3;
+
+        return 0;
+}
+
+static const struct mtd_ooblayout_ops onenand_oob_128_ooblayout_ops = {
+        .ecc = onenand_ooblayout_128_ecc,
+        .free = onenand_ooblayout_128_free,
 };
 
 /**
- * onenand_oob_64 - oob info for large (2KB) page
+ * onenand_oob_32_64 - oob info for large (2KB) page
  */
-static struct nand_ecclayout onenand_oob_64 = {
-        .eccbytes       = 20,
-        .eccpos         = {
-                8, 9, 10, 11, 12,
-                24, 25, 26, 27, 28,
-                40, 41, 42, 43, 44,
-                56, 57, 58, 59, 60,
-                },
-        .oobfree        = {
-                {2, 3}, {14, 2}, {18, 3}, {30, 2},
-                {34, 3}, {46, 2}, {50, 3}, {62, 2}
+static int onenand_ooblayout_32_64_ecc(struct mtd_info *mtd, int section,
+                                       struct mtd_oob_region *oobregion)
+{
+        if (section > 3)
+                return -ERANGE;
+
+        oobregion->offset = (section * 16) + 8;
+        oobregion->length = 5;
+
+        return 0;
+}
+
+static int onenand_ooblayout_32_64_free(struct mtd_info *mtd, int section,
+                                        struct mtd_oob_region *oobregion)
+{
+        int sections = (mtd->oobsize / 32) * 2;
+
+        if (section >= sections)
+                return -ERANGE;
+
+        if (section & 1) {
+                oobregion->offset = ((section - 1) * 16) + 14;
+                oobregion->length = 2;
+        } else  {
+                oobregion->offset = (section * 16) + 2;
+                oobregion->length = 3;
         }
-};
 
-/**
- * onenand_oob_32 - oob info for middle (1KB) page
- */
-static struct nand_ecclayout onenand_oob_32 = {
-        .eccbytes       = 10,
-        .eccpos         = {
-                8, 9, 10, 11, 12,
-                24, 25, 26, 27, 28,
-                },
-        .oobfree        = { {2, 3}, {14, 2}, {18, 3}, {30, 2} }
+        return 0;
+}
+
+static const struct mtd_ooblayout_ops onenand_oob_32_64_ooblayout_ops = {
+        .ecc = onenand_ooblayout_32_64_ecc,
+        .free = onenand_ooblayout_32_64_free,
 };
 
 static const unsigned char ffchars[] = {
@@ -3957,22 +3990,22 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
         switch (mtd->oobsize) {
         case 128:
                 if (FLEXONENAND(this)) {
-                        this->ecclayout = &flexonenand_oob_128;
+                        mtd_set_ooblayout(mtd, &flexonenand_ooblayout_ops);
                         mtd->subpage_sft = 0;
                 } else {
-                        this->ecclayout = &onenand_oob_128;
+                        mtd_set_ooblayout(mtd, &onenand_oob_128_ooblayout_ops);
                         mtd->subpage_sft = 2;
                 }
                 if (ONENAND_IS_NOP_1(this))
                         mtd->subpage_sft = 0;
                 break;
         case 64:
-                this->ecclayout = &onenand_oob_64;
+                mtd_set_ooblayout(mtd, &onenand_oob_32_64_ooblayout_ops);
                 mtd->subpage_sft = 2;
                 break;
 
         case 32:
-                this->ecclayout = &onenand_oob_32;
+                mtd_set_ooblayout(mtd, &onenand_oob_32_64_ooblayout_ops);
                 mtd->subpage_sft = 1;
                 break;
 
@@ -3981,7 +4014,7 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
                         __func__, mtd->oobsize);
                 mtd->subpage_sft = 0;
                 /* To prevent kernel oops */
-                this->ecclayout = &onenand_oob_32;
+                mtd_set_ooblayout(mtd, &onenand_oob_32_64_ooblayout_ops);
                 break;
         }
 
@@ -3997,7 +4030,6 @@ int onenand_scan(struct mtd_info *mtd, int maxchips)
 
         mtd->oobavail = ret;
 
-        mtd_set_ecclayout(mtd, this->ecclayout);
         mtd->ecc_strength = 1;
 
         /* Fill in remaining MTD driver data */
diff --git a/include/linux/mtd/onenand.h b/include/linux/mtd/onenand.h
index 4596503c9da9..0aaa98b219a4 100644
--- a/include/linux/mtd/onenand.h
+++ b/include/linux/mtd/onenand.h
@@ -80,7 +80,6 @@ struct onenand_bufferram {
  * @page_buf:           [INTERN] page main data buffer
  * @oob_buf:            [INTERN] page oob data buffer
  * @subpagesize:        [INTERN] holds the subpagesize
- * @ecclayout:          [REPLACEABLE] the default ecc placement scheme
  * @bbm:                [REPLACEABLE] pointer to Bad Block Management
  * @priv:               [OPTIONAL] pointer to private chip date
  */
@@ -134,7 +133,6 @@ struct onenand_chip {
 #endif
 
         int                     subpagesize;
-        struct nand_ecclayout   *ecclayout;
 
         void                    *bbm;