[PATCH 3/8] commands: mmc: add write_reliability subcommand

[Marco Felsch <m.felsch@xxxxxxxxxxxxxx>]

From: LI Qingwu <Qing-wu.Li@xxxxxxxxxxxxxxxxxxxxxxx>

Add new sub-command to enable the write reliability.

Signed-off-by: LI Qingwu <Qing-wu.Li@xxxxxxxxxxxxxxxxxxxxxxx>
[m.felsch@xxxxxxxxxxxxxx: minor cleanups]
Signed-off-by: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
---
 commands/mmc.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++-
 include/mci.h  |  4 +++
 2 files changed, 71 insertions(+), 1 deletion(-)

diff --git a/commands/mmc.c b/commands/mmc.c
index 1e62b71850e0..1009b16bfdf7 100644
--- a/commands/mmc.c
+++ b/commands/mmc.c
@@ -147,6 +147,67 @@ static int do_mmc_enh_area(int argc, char *argv[])
 	return COMMAND_ERROR;
 }
 
+static int do_mmc_write_reliability(int argc, char *argv[])
+{
+	const char *devpath;
+	struct mci *mci;
+	u8 *ext_csd;
+
+	if (argc - optind != 1) {
+		printf("Usage: mmc write_reliability /dev/mmcX\n");
+		return COMMAND_ERROR_USAGE;
+	}
+
+	devpath = argv[optind];
+
+	mci = mci_get_device_by_devpath(devpath);
+	if (!mci) {
+		printf("Failure to open %s as mci device\n", devpath);
+		return COMMAND_ERROR;
+	}
+
+	ext_csd = mci_get_ext_csd(mci);
+	if (IS_ERR(ext_csd))
+		return COMMAND_ERROR;
+
+	if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED]) {
+		printf("Partitioning already finalized\n");
+		goto error;
+	}
+
+	if (!(ext_csd[EXT_CSD_WR_REL_PARAM] & EXT_CSD_EN_REL_WR)) {
+		printf("Device doesn't support the enhanced definition of reliable write\n");
+		goto error;
+	}
+
+	if (!(ext_csd[EXT_CSD_WR_REL_PARAM] & EXT_CSD_HS_CTRL_REL)) {
+		printf("Device doesn't support WR_REL_SET writes\n");
+		goto error;
+	}
+
+	/*
+	 * Host has one opportunity to write all of the bits. Separate writes to
+	 * individual bits are not permitted so set all bits for now.
+	 */
+	if ((ext_csd[EXT_CSD_WR_REL_SET] & 0x1f) != 0x1f) {
+		int ret;
+
+		ret = mci_switch(mci, EXT_CSD_WR_REL_SET, 0x1f);
+		if (ret) {
+			printf("Failure to write to EXT_CSD_WR_REL_SET\n");
+			goto error;
+		}
+	}
+
+	free(ext_csd);
+
+	return COMMAND_SUCCESS;
+
+error:
+	free(ext_csd);
+	return COMMAND_ERROR;
+}
+
 static struct {
 	const char *cmd;
 	int (*func)(int argc, char *argv[]);
@@ -154,6 +215,9 @@ static struct {
 	{
 		.cmd = "enh_area",
 		.func = do_mmc_enh_area,
+	}, {
+		.cmd = "write_reliability",
+		.func = do_mmc_write_reliability,
 	}
 };
 
@@ -189,11 +253,13 @@ BAREBOX_CMD_HELP_TEXT("The subcommand enh_area creates an enhanced area of")
 BAREBOX_CMD_HELP_TEXT("maximal size.")
 BAREBOX_CMD_HELP_TEXT("Note, with -c this is an irreversible action.")
 BAREBOX_CMD_HELP_OPT("-c", "complete partitioning")
+BAREBOX_CMD_HELP_TEXT("")
+BAREBOX_CMD_HELP_TEXT("The subcommand write_reliability enable write reliability")
 BAREBOX_CMD_HELP_END
 
 BAREBOX_CMD_START(mmc)
 	.cmd = do_mmc,
-	BAREBOX_CMD_OPTS("enh_area [-c] /dev/mmcX")
+	BAREBOX_CMD_OPTS("write_reliability|enh_area [-c] /dev/mmcX")
 	BAREBOX_CMD_GROUP(CMD_GRP_HWMANIP)
 	BAREBOX_CMD_HELP(cmd_mmc_help)
 BAREBOX_CMD_END
diff --git a/include/mci.h b/include/mci.h
index f38384613728..4fed8d739284 100644
--- a/include/mci.h
+++ b/include/mci.h
@@ -307,6 +307,10 @@
 /* register PARTITIONING_SUPPORT [160] */
 #define EXT_CSD_ENH_ATTRIBUTE_EN_MASK	(1 << 1)
 
+/* register EXT_CSD_WR_REL_PARAM [166] */
+#define EXT_CSD_HS_CTRL_REL		(1 << 0)
+#define EXT_CSD_EN_REL_WR		(1 << 2)
+
 /* register BUS_WIDTH [183], field Bus Mode Selection [4:0] */
 #define EXT_CSD_BUS_WIDTH_1	0	/* Card is in 1 bit mode */
 #define EXT_CSD_BUS_WIDTH_4	1	/* Card is in 4 bit mode */
-- 
2.39.2