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Subject[PATCH v2 2/4] mtd: rawnand: Add support Macronix Block Protection function
Date
Macronix AC series support using SET_FEATURES to change
Block Protection and Unprotection.

Signed-off-by: Mason Yang <masonccyang@mxic.com.tw>
---
drivers/mtd/nand/raw/nand_macronix.c | 69 +++++++++++++++++++++++++++++++++---
1 file changed, 65 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand_macronix.c b/drivers/mtd/nand/raw/nand_macronix.c
index 58511ae..13929bf 100644
--- a/drivers/mtd/nand/raw/nand_macronix.c
+++ b/drivers/mtd/nand/raw/nand_macronix.c
@@ -11,6 +11,10 @@
#define MACRONIX_READ_RETRY_BIT BIT(0)
#define MACRONIX_NUM_READ_RETRY_MODES 6

+#define ONFI_FEATURE_ADDR_MXIC_PROTECTION 0xA0
+#define MXIC_BLOCK_PROTECTION_ALL_LOCK 0x38
+#define MXIC_BLOCK_PROTECTION_ALL_UNLOCK 0x0
+
struct nand_onfi_vendor_macronix {
u8 reserved;
u8 reliability_func;
@@ -57,7 +61,7 @@ static void macronix_nand_onfi_init(struct nand_chip *chip)
* the timings unlike what is declared in the parameter page. Unflag
* this feature to avoid unnecessary downturns.
*/
-static void macronix_nand_fix_broken_get_timings(struct nand_chip *chip)
+static int macronix_nand_fix_broken_get_timings(struct nand_chip *chip)
{
unsigned int i;
static const char * const broken_get_timings[] = {
@@ -78,7 +82,7 @@ static void macronix_nand_fix_broken_get_timings(struct nand_chip *chip)
};

if (!chip->parameters.supports_set_get_features)
- return;
+ return 0;

for (i = 0; i < ARRAY_SIZE(broken_get_timings); i++) {
if (!strcmp(broken_get_timings[i], chip->parameters.model))
@@ -86,22 +90,79 @@ static void macronix_nand_fix_broken_get_timings(struct nand_chip *chip)
}

if (i == ARRAY_SIZE(broken_get_timings))
- return;
+ return 0;

bitmap_clear(chip->parameters.get_feature_list,
ONFI_FEATURE_ADDR_TIMING_MODE, 1);
bitmap_clear(chip->parameters.set_feature_list,
ONFI_FEATURE_ADDR_TIMING_MODE, 1);
+ return 1;
+}
+
+/*
+ * Macronix NAND supports Block Protection by Protectoin(PT) pin;
+ * active high at power-on which protects the entire chip even the #WP is
+ * disabled. Lock/unlock protection area can be partition according to
+ * protection bits, i.e. upper 1/2 locked, upper 1/4 locked and so on.
+ */
+static int mxic_nand_lock(struct nand_chip *chip, loff_t ofs, uint64_t len)
+{
+ u8 feature[ONFI_SUBFEATURE_PARAM_LEN];
+ int ret;
+
+ feature[0] = MXIC_BLOCK_PROTECTION_ALL_LOCK;
+ nand_select_target(chip, 0);
+ ret = nand_set_features(chip, ONFI_FEATURE_ADDR_MXIC_PROTECTION,
+ feature);
+ nand_deselect_target(chip);
+ if (ret)
+ pr_err("%s all blocks failed\n", __func__);
+
+ return ret;
+}
+
+static int mxic_nand_unlock(struct nand_chip *chip, loff_t ofs, uint64_t len)
+{
+ u8 feature[ONFI_SUBFEATURE_PARAM_LEN];
+ int ret;
+
+ feature[0] = MXIC_BLOCK_PROTECTION_ALL_UNLOCK;
+ nand_select_target(chip, 0);
+ ret = nand_set_features(chip, ONFI_FEATURE_ADDR_MXIC_PROTECTION,
+ feature);
+ nand_deselect_target(chip);
+ if (ret)
+ pr_err("%s all blocks failed\n", __func__);
+
+ return ret;
}

+/*
+ * Macronix NAND AC series support Block Protection by SET_FEATURES
+ * to lock/unlock blocks.
+ */
static int macronix_nand_init(struct nand_chip *chip)
{
+ bool blockprotected = false;
+
if (nand_is_slc(chip))
chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;

- macronix_nand_fix_broken_get_timings(chip);
+ if (macronix_nand_fix_broken_get_timings(chip))
+ blockprotected = true;
+
macronix_nand_onfi_init(chip);

+ if (blockprotected) {
+ bitmap_set(chip->parameters.set_feature_list,
+ ONFI_FEATURE_ADDR_MXIC_PROTECTION, 1);
+ bitmap_set(chip->parameters.get_feature_list,
+ ONFI_FEATURE_ADDR_MXIC_PROTECTION, 1);
+
+ chip->_lock = mxic_nand_lock;
+ chip->_unlock = mxic_nand_unlock;
+ }
+
return 0;
}

--
1.9.1
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