Macronix AD series support using power down command to
enter a minimum power consumption state.
MTD default _suspend/_resume function replacement by
manufacturer postponed initialization.
Signed-off-by: Mason Yang <masonccy...@mxic.com.tw>
---
drivers/mtd/nand/raw/nand_macronix.c | 78 +++++++++++++++++++++++++++++++++++-
1 file changed, 77 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/raw/nand_macronix.c
b/drivers/mtd/nand/raw/nand_macronix.c
index 991c636..99a7b2e 100644
--- a/drivers/mtd/nand/raw/nand_macronix.c
+++ b/drivers/mtd/nand/raw/nand_macronix.c
@@ -15,6 +15,8 @@
#define MXIC_BLOCK_PROTECTION_ALL_LOCK 0x38
#define MXIC_BLOCK_PROTECTION_ALL_UNLOCK 0x0
+#define NAND_CMD_POWER_DOWN 0xB9
+
struct nand_onfi_vendor_macronix {
u8 reserved;
u8 reliability_func;
@@ -78,6 +80,12 @@ static void macronix_nand_onfi_init(struct nand_chip *chip)
"MX30UF4G28AC",
};
+static const char * const nand_power_down[] = {
+ "MX30LF1G28AD",
+ "MX30LF2G28AD",
+ "MX30LF4G28AD",
+};
+
static void macronix_nand_fix_broken_get_timings(struct nand_chip *chip)
{
unsigned int i;
@@ -144,8 +152,64 @@ static int mxic_nand_unlock(struct mtd_info *mtd, loff_t
ofs, uint64_t len)
return ret;
}
+int nand_power_down_op(struct nand_chip *chip)
+{
+ int ret;
+
+ if (nand_has_exec_op(chip)) {
+ struct nand_op_instr instrs[] = {
+ NAND_OP_CMD(NAND_CMD_POWER_DOWN, 0),
+ };
+
+ struct nand_operation op = NAND_OPERATION(chip->cur_cs, instrs);
+
+ ret = nand_exec_op(chip, &op);
+ if (ret)
+ return ret;
+
+ } else {
+ chip->legacy.cmdfunc(chip, NAND_CMD_POWER_DOWN, -1, -1);
+ }
+
+ return 0;
+}
+
+static int mxic_nand_suspend(struct mtd_info *mtd)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+
+ mutex_lock(&chip->lock);
+
+ nand_select_target(chip, 0);
+ nand_power_down_op(chip);
+ nand_deselect_target(chip);
+
+ chip->suspend = 1;
+ mutex_unlock(&chip->lock);
+
+ return 0;
+}
+
+static void mxic_nand_resume(struct mtd_info *mtd)
+{
+ struct nand_chip *chip = mtd_to_nand(mtd);
+
+ mutex_lock(&chip->lock);
+ // toggle #CS pin to resume NAND device
+ nand_select_target(chip, 0);
+ ndelay(20);
+ nand_deselect_target(chip);
+
+ if (chip->suspend)
+ chip->suspended = 0;
+ else
+ pr_err("%s call for a chip which is not in suspended state\n",
+ __func__);
+ mutex_unlock(&chip->lock);
+}
+
/*
- * Macronix AC series support using SET/GET_FEATURES to change
+ * Macronix AC and AD series support using SET/GET_FEATURES to change
* Block Protection and Unprotection.
*
* MTD call-back function replacement by manufacturer postponed
@@ -163,6 +227,18 @@ static void macronix_nand_post_init(struct nand_chip *chip)
}
}
+ for (i = 0; i < ARRAY_SIZE(nand_power_down); i++) {
+ if (!strcmp(nand_power_down[i], chip->parameters.model)) {
+ blockprotected = 1;
+ break;
+ }
+ }
+
+ if (i < ARRAY_SIZE(nand_power_down)) {
+ mtd->_suspend = mxic_nand_suspend;
+ mtd->_resume = mxic_nand_resume;
+ }
+
if (blockprotected && chip->parameters.supports_set_get_features) {
bitmap_set(chip->parameters.set_feature_list,
ONFI_FEATURE_ADDR_MXIC_PROTECTION, 1);
--
1.9.1
