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Subject[PATCH v2 4/4] mtd: rawnand: Add support Macronix deep power down mode
Date
Macronix AD series support deep power down mode for a minimum
power consumption state.

Patch nand_suspend() & nand_resume() by Macronix specific
deep power down mode command and exit it.

Signed-off-by: Mason Yang <masonccyang@mxic.com.tw>
---
drivers/mtd/nand/raw/nand_macronix.c | 72 +++++++++++++++++++++++++++++++++++-
1 file changed, 70 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand_macronix.c b/drivers/mtd/nand/raw/nand_macronix.c
index 13929bf..3098bc0 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;
@@ -137,13 +139,66 @@ static int mxic_nand_unlock(struct nand_chip *chip, 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 nand_chip *chip)
+{
+ int ret;
+
+ nand_select_target(chip, 0);
+ ret = nand_power_down_op(chip);
+ if (ret < 0)
+ pr_err("%s called for chip into suspend failed\n", __func__);
+ nand_deselect_target(chip);
+
+ return ret;
+}
+
+static void mxic_nand_resume(struct nand_chip *chip)
+{
+ /*
+ * Toggle #CS pin to resume NAND device and don't care
+ * of the others CLE, #WE, #RE pins status.
+ * Here sending power down command to toggle #CS line.
+ */
+ nand_select_target(chip, 0);
+ nand_power_down_op(chip);
+ nand_deselect_target(chip);
+}
+
/*
- * Macronix NAND AC series support Block Protection by SET_FEATURES
+ * Macronix NAND AC & AD series support Block Protection by SET_FEATURES
* to lock/unlock blocks.
*/
static int macronix_nand_init(struct nand_chip *chip)
{
- bool blockprotected = false;
+ unsigned int i;
+ bool blockprotected = false, powerdown = false;
+ static const char * const power_down_dev[] = {
+ "MX30LF1G28AD",
+ "MX30LF2G28AD",
+ "MX30LF4G28AD",
+ };

if (nand_is_slc(chip))
chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
@@ -153,6 +208,14 @@ static int macronix_nand_init(struct nand_chip *chip)

macronix_nand_onfi_init(chip);

+ for (i = 0; i < ARRAY_SIZE(power_down_dev); i++) {
+ if (!strcmp(power_down_dev[i], chip->parameters.model)) {
+ blockprotected = true;
+ powerdown = true;
+ break;
+ }
+ }
+
if (blockprotected) {
bitmap_set(chip->parameters.set_feature_list,
ONFI_FEATURE_ADDR_MXIC_PROTECTION, 1);
@@ -163,6 +226,11 @@ static int macronix_nand_init(struct nand_chip *chip)
chip->_unlock = mxic_nand_unlock;
}

+ if (powerdown) {
+ chip->_suspend = mxic_nand_suspend;
+ chip->_resume = mxic_nand_resume;
+ }
+
return 0;
}

--
1.9.1
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