linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Mason Yang <masonccyang@mxic.com.tw>
To: miquel.raynal@bootlin.com, richard@nod.at, vigneshr@ti.com,
	robh+dt@kernel.org, mark.rutland@arm.com
Cc: devicetree@vger.kernel.org, tglx@linutronix.de,
	juliensu@mxic.com.tw, frieder.schrempf@kontron.de,
	allison@lohutok.net, linux-kernel@vger.kernel.org,
	linux-mtd@lists.infradead.org, yuehaibing@huawei.com,
	Mason Yang <masonccyang@mxic.com.tw>
Subject: [PATCH v5 1/2] mtd: rawnand: Add support for Macronix NAND randomizer
Date: Mon, 17 Feb 2020 14:56:39 +0800	[thread overview]
Message-ID: <1581922600-25461-2-git-send-email-masonccyang@mxic.com.tw> (raw)
In-Reply-To: <1581922600-25461-1-git-send-email-masonccyang@mxic.com.tw>

Macronix NANDs support randomizer operation for user data scrambled,
which can be enabled with a SET_FEATURE.

User data written to the NAND device without randomizer is still readable
after randomizer function enabled.
The penalty of randomizer are subpage accesses prohibited and more time
period is needed in program operation and entering deep power-down mode.
i.e., tPROG 300us to 340us(randomizer enabled)

For more high-reliability concern, if subpage write not available with
hardware ECC and then to enable randomizer is recommended by default.
Driver checks byte 167 of Vendor Blocks in ONFI parameter page table
to see if this high-reliability function is supported. By adding a new
specific DT property in children nodes to enable randomizer function.

Signed-off-by: Mason Yang <masonccyang@mxic.com.tw>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
 drivers/mtd/nand/raw/nand_macronix.c | 81 ++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)

diff --git a/drivers/mtd/nand/raw/nand_macronix.c b/drivers/mtd/nand/raw/nand_macronix.c
index 3ff7ce0..0a2fe25 100644
--- a/drivers/mtd/nand/raw/nand_macronix.c
+++ b/drivers/mtd/nand/raw/nand_macronix.c
@@ -11,6 +11,19 @@
 #define MACRONIX_READ_RETRY_BIT BIT(0)
 #define MACRONIX_NUM_READ_RETRY_MODES 6
 
+#define ONFI_FEATURE_ADDR_MXIC_RANDOMIZER 0xB0
+#define MACRONIX_RANDOMIZER_BIT BIT(1)
+#define MACRONIX_RANDOMIZER_ENPGM BIT(0)
+#define MACRONIX_RANDOMIZER_RANDEN BIT(1)
+#define MACRONIX_RANDOMIZER_RANDOPT BIT(2)
+#define MACRONIX_RANDOMIZER_MODE_ENTER	\
+	(MACRONIX_RANDOMIZER_ENPGM |	\
+	 MACRONIX_RANDOMIZER_RANDEN |	\
+	 MACRONIX_RANDOMIZER_RANDOPT)
+#define MACRONIX_RANDOMIZER_MODE_EXIT	\
+	(MACRONIX_RANDOMIZER_RANDEN |	\
+	 MACRONIX_RANDOMIZER_RANDOPT)
+
 struct nand_onfi_vendor_macronix {
 	u8 reserved;
 	u8 reliability_func;
@@ -29,15 +42,83 @@ static int macronix_nand_setup_read_retry(struct nand_chip *chip, int mode)
 	return nand_set_features(chip, ONFI_FEATURE_ADDR_READ_RETRY, feature);
 }
 
+static int macronix_nand_randomizer_check_enable(struct nand_chip *chip)
+{
+	u8 feature[ONFI_SUBFEATURE_PARAM_LEN];
+	int ret;
+
+	ret = nand_get_features(chip, ONFI_FEATURE_ADDR_MXIC_RANDOMIZER,
+				feature);
+	if (ret < 0)
+		return ret;
+
+	if (feature[0])
+		return feature[0];
+
+	feature[0] = MACRONIX_RANDOMIZER_MODE_ENTER;
+	ret = nand_set_features(chip, ONFI_FEATURE_ADDR_MXIC_RANDOMIZER,
+				feature);
+	if (ret < 0)
+		return ret;
+
+	/* RANDEN and RANDOPT OTP bits are programmed */
+	feature[0] = 0x0;
+	ret = nand_prog_page_op(chip, 0, 0, feature, 1);
+	if (ret < 0)
+		return ret;
+
+	ret = nand_get_features(chip, ONFI_FEATURE_ADDR_MXIC_RANDOMIZER,
+				feature);
+	if (ret < 0)
+		return ret;
+
+	feature[0] &= MACRONIX_RANDOMIZER_MODE_EXIT;
+	ret = nand_set_features(chip, ONFI_FEATURE_ADDR_MXIC_RANDOMIZER,
+				feature);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
 static void macronix_nand_onfi_init(struct nand_chip *chip)
 {
 	struct nand_parameters *p = &chip->parameters;
 	struct nand_onfi_vendor_macronix *mxic;
+	struct device_node *dn = nand_get_flash_node(chip);
+	int rand_otp = 0;
+	int ret;
 
 	if (!p->onfi)
 		return;
 
+	if (of_find_property(dn, "mxic,enable-randomizer-otp", NULL))
+		rand_otp = 1;
+
 	mxic = (struct nand_onfi_vendor_macronix *)p->onfi->vendor;
+	/* Subpage write is prohibited in randomizer operatoin */
+	if (rand_otp && chip->options & NAND_NO_SUBPAGE_WRITE &&
+	    mxic->reliability_func & MACRONIX_RANDOMIZER_BIT) {
+		if (p->supports_set_get_features) {
+			bitmap_set(p->set_feature_list,
+				   ONFI_FEATURE_ADDR_MXIC_RANDOMIZER, 1);
+			bitmap_set(p->get_feature_list,
+				   ONFI_FEATURE_ADDR_MXIC_RANDOMIZER, 1);
+			ret = macronix_nand_randomizer_check_enable(chip);
+			if (ret < 0) {
+				bitmap_clear(p->set_feature_list,
+					     ONFI_FEATURE_ADDR_MXIC_RANDOMIZER,
+					     1);
+				bitmap_clear(p->get_feature_list,
+					     ONFI_FEATURE_ADDR_MXIC_RANDOMIZER,
+					     1);
+				pr_info("Macronix NAND randomizer failed\n");
+			} else {
+				pr_info("Macronix NAND randomizer enabled\n");
+			}
+		}
+	}
+
 	if ((mxic->reliability_func & MACRONIX_READ_RETRY_BIT) == 0)
 		return;
 
-- 
1.9.1


  reply	other threads:[~2020-02-17  6:58 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-17  6:56 [PATCH v5 0/2] mtd: rawnand: Add support for Macronix NAND randomizer Mason Yang
2020-02-17  6:56 ` Mason Yang [this message]
2020-03-10 18:32   ` [PATCH v5 1/2] " Miquel Raynal
2020-02-17  6:56 ` [PATCH v5 2/2] dt-bindings: mtd: Document Macronix NAND device bindings Mason Yang
2020-03-10 18:31   ` Miquel Raynal
2020-03-11  7:45   ` Miquel Raynal
2020-03-12  1:55     ` masonccyang

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1581922600-25461-2-git-send-email-masonccyang@mxic.com.tw \
    --to=masonccyang@mxic.com.tw \
    --cc=allison@lohutok.net \
    --cc=devicetree@vger.kernel.org \
    --cc=frieder.schrempf@kontron.de \
    --cc=juliensu@mxic.com.tw \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mtd@lists.infradead.org \
    --cc=mark.rutland@arm.com \
    --cc=miquel.raynal@bootlin.com \
    --cc=richard@nod.at \
    --cc=robh+dt@kernel.org \
    --cc=tglx@linutronix.de \
    --cc=vigneshr@ti.com \
    --cc=yuehaibing@huawei.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).