mail archive of the barebox mailing list
 help / color / mirror / Atom feed
From: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
To: barebox@lists.infradead.org
Subject: [PATCH v3 2/2] mci: implement command to switch a mmc device to enhanced mode
Date: Mon,  8 Oct 2018 10:29:21 +0200	[thread overview]
Message-ID: <20181008082921.26922-2-u.kleine-koenig@pengutronix.de> (raw)
In-Reply-To: <20181008082921.26922-1-u.kleine-koenig@pengutronix.de>

The command structure allows adding more subcommands and is designed to
match the Linux program mmc from the mmc-utils. So later more commands
can easily be added if need be.

Compared to mmc-utils'

	mmc enh_area set <-y|-n|-c> <start KiB> <length KiB> <device>

the command that is implemented here (

	mmc enh_area setmax [-c] <device>

) is easier to use (because you don't have to check the maximal allowed
size by reading some registers and calculate the available size from
them (which then must be calculated back to register values by the mmc
command)) but less flexible as it doesn't allow all the crazy
possibilities specified in the eMMC standard but just creates an
enhanced area with maximal size.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
---
 commands/Kconfig  |  11 +++
 commands/Makefile |   1 +
 commands/mmc.c    | 195 ++++++++++++++++++++++++++++++++++++++++++++++
 include/mci.h     |   7 ++
 4 files changed, 214 insertions(+)
 create mode 100644 commands/mmc.c

diff --git a/commands/Kconfig b/commands/Kconfig
index 675bd1ca76a0..221d65a358e0 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -238,6 +238,17 @@ config CMD_VERSION
 
 	  barebox 2014.05.0-00142-gb289373 #177 Mon May 12 20:35:55 CEST 2014
 
+config CMD_MMC
+	tristate
+	prompt "mmc command allowing to set enhanced area"
+	depends on MCI
+	help
+	  Configure mmc cards similar to the userspace mmc utility. Compared to
+	  mmc_extcsd it works on a higher abstraction level.
+
+	  Currently only the enh_area subcommand is implemented to configure
+	  the "Enhanced Area" of an mmc device.
+
 config CMD_MMC_EXTCSD
 	tristate
 	prompt "read/write eMMC ext. CSD register"
diff --git a/commands/Makefile b/commands/Makefile
index eb4796389e6b..27a62240b039 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -119,6 +119,7 @@ obj-$(CONFIG_CMD_DHCP)		+= dhcp.o
 obj-$(CONFIG_CMD_BOOTCHOOSER)	+= bootchooser.o
 obj-$(CONFIG_CMD_DHRYSTONE)	+= dhrystone.o
 obj-$(CONFIG_CMD_SPD_DECODE)	+= spd_decode.o
+obj-$(CONFIG_CMD_MMC)		+= mmc.o
 obj-$(CONFIG_CMD_MMC_EXTCSD)	+= mmc_extcsd.o
 obj-$(CONFIG_CMD_NAND_BITFLIP)	+= nand-bitflip.o
 obj-$(CONFIG_CMD_SEED)		+= seed.o
diff --git a/commands/mmc.c b/commands/mmc.c
new file mode 100644
index 000000000000..b3af2d9c769c
--- /dev/null
+++ b/commands/mmc.c
@@ -0,0 +1,195 @@
+#include <command.h>
+#include <mci.h>
+#include <stdio.h>
+#include <string.h>
+
+static int mmc_enh_area_setmax(struct mci *mci, u8 *ext_csd)
+{
+	unsigned i;
+	struct {
+		unsigned index;
+		unsigned value;
+	} regval[] = {
+		{
+			.index = EXT_CSD_ERASE_GROUP_DEF,
+			.value = 1,
+		}, {
+			.index = EXT_CSD_ENH_START_ADDR,
+			.value = 0,
+		}, {
+			.index = EXT_CSD_ENH_START_ADDR + 1,
+			.value = 0,
+		}, {
+			.index = EXT_CSD_ENH_START_ADDR + 2,
+			.value = 0,
+		}, {
+			.index = EXT_CSD_ENH_START_ADDR + 3,
+			.value = 0,
+		}, {
+			.index = EXT_CSD_ENH_SIZE_MULT,
+			.value = ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT],
+		}, {
+			.index = EXT_CSD_ENH_SIZE_MULT + 1,
+			.value = ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT + 1],
+		}, {
+			.index = EXT_CSD_ENH_SIZE_MULT + 2,
+			.value = ext_csd[EXT_CSD_MAX_ENH_SIZE_MULT + 2],
+		}, {
+			.index = EXT_CSD_PARTITIONS_ATTRIBUTE,
+			.value = ext_csd[EXT_CSD_PARTITIONS_ATTRIBUTE] | EXT_CSD_ENH_USR_MASK,
+		}
+	};
+
+	for (i = 0; i < ARRAY_SIZE(regval); ++i) {
+		int ret = mci_switch(mci, regval[i].index, regval[i].value);
+		if (ret) {
+			printf("Failure to write to register %u", regval[i].index);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int mmc_partitioning_complete(struct mci *mci)
+{
+	int ret;
+
+	ret = mci_switch(mci, EXT_CSD_PARTITION_SETTING_COMPLETED, 1);
+	if (ret)
+		printf("Failure to write to EXT_CSD_PARTITION_SETTING_COMPLETED\n");
+
+	return ret;
+}
+
+static u8 *mci_get_ext_csd(struct mci *mci)
+{
+	u8 *ext_csd;
+	int ret;
+
+	ext_csd = xmalloc(512);
+
+	ret = mci_send_ext_csd(mci, ext_csd);
+	if (ret) {
+		printf("Failure to read EXT_CSD register\n");
+		return ERR_PTR(-EIO);
+	}
+
+	return ext_csd;
+}
+
+/* enh_area setmax [-c] /dev/mmcX */
+static int do_mmc_enh_area(int argc, char *argv[])
+{
+	char *devpath;
+	struct mci *mci;
+	u8 *ext_csd;
+	int set_completed = 0;
+	int ret;
+
+	if (argc < 2 || strcmp(argv[1], "setmax") != 0)
+		goto usage;
+
+	if (argc == 3) {
+		/* enh_area setmax /dev/mmcX */
+		devpath = argv[2];
+		set_completed = false;
+	} else if (argc == 4 || strcmp(argv[2], "-c") == 0) {
+		/* enh_area setmax -c /dev/mmcX */
+		devpath = argv[3];
+		set_completed = true;
+	} else {
+usage:
+		printf("Usage: mmc enh_area setmax [-c] /dev/mmcX\n");
+		return COMMAND_ERROR_USAGE;
+	}
+
+	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_PARTITIONING_SUPPORT] & EXT_CSD_ENH_ATTRIBUTE_EN_MASK)) {
+		printf("Device doesn't support enhanced area\n");
+		goto error;
+	}
+
+	if (ext_csd[EXT_CSD_PARTITION_SETTING_COMPLETED]) {
+		printf("Partitioning already finalized\n");
+		goto error;
+	}
+
+	ret = mmc_enh_area_setmax(mci, ext_csd);
+	if (ret)
+		goto error;
+
+	free(ext_csd);
+
+	if (set_completed) {
+		ret = mmc_partitioning_complete(mci);
+		if (ret)
+			return COMMAND_ERROR;
+		printf("Now power cycle the device to let it reconfigure itself.\n");
+	}
+
+	return COMMAND_SUCCESS;
+
+error:
+	free(ext_csd);
+	return COMMAND_ERROR;
+}
+
+static struct {
+	const char *cmd;
+	int (*func)(int argc, char *argv[]);
+} mmc_subcmds[] = {
+	{
+		.cmd = "enh_area",
+		.func = do_mmc_enh_area,
+	}
+};
+
+static int do_mmc(int argc, char *argv[])
+{
+	size_t i;
+	int (*func)(int argc, char *argv[]) = NULL;
+
+	if (argc < 2) {
+		printf("mmc: required subcommand missing\n");
+		return 1;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(mmc_subcmds); ++i) {
+		if (strcmp(mmc_subcmds[i].cmd, argv[1]) == 0) {
+			func = mmc_subcmds[i].func;
+			break;
+		}
+	}
+
+	if (func) {
+		return func(argc - 1, argv + 1);
+	} else {
+		printf("mmc: subcommand \"%s\" not found\n", argv[1]);
+		return COMMAND_ERROR_USAGE;
+	}
+}
+
+BAREBOX_CMD_HELP_START(mmc)
+BAREBOX_CMD_HELP_TEXT("Modifies mmc properties.")
+BAREBOX_CMD_HELP_TEXT("")
+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_END
+
+BAREBOX_CMD_START(mmc)
+	.cmd = do_mmc,
+	BAREBOX_CMD_OPTS("enh_area setmax [-c] /dev/mmcX")
+	BAREBOX_CMD_HELP(cmd_mmc_help)
+BAREBOX_CMD_END
diff --git a/include/mci.h b/include/mci.h
index 5d0c2f8f9638..c1645fa07d85 100644
--- a/include/mci.h
+++ b/include/mci.h
@@ -305,6 +305,13 @@
 #define EXT_CSD_CARD_TYPE_SDR_1_2V	(1<<5)	/* Card can run at 200MHz */
 						/* SDR mode @1.2V I/O */
 
+/* register PARTITIONS_ATTRIBUTE [156] */
+#define EXT_CSD_ENH_USR_MASK		(1 << 0)
+
+/* register PARTITIONING_SUPPORT [160] */
+#define EXT_CSD_ENH_ATTRIBUTE_EN_MASK	(1 << 0)
+
+/* 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 */
 #define EXT_CSD_BUS_WIDTH_8	2	/* Card is in 8 bit mode */
-- 
2.19.0


_______________________________________________
barebox mailing list
barebox@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/barebox

  reply	other threads:[~2018-10-08  8:29 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-19 13:28 [PATCH v2 1/2] mci: drop unused parameter from mci_switch() Uwe Kleine-König
2018-01-19 13:28 ` [PATCH v2 2/2] mci: implement command to switch a mmc device to enhanced mode Uwe Kleine-König
2018-01-22  8:12   ` Sascha Hauer
2018-10-02  8:33     ` Uwe Kleine-König
2018-10-08  7:49       ` Sascha Hauer
2018-10-08  8:29         ` [PATCH v3 1/2] mci: provide wrapper for mci_get_device_by_name ∘ devpath_to_name Uwe Kleine-König
2018-10-08  8:29           ` Uwe Kleine-König [this message]
2018-10-10  6:44             ` [PATCH v3 2/2] mci: implement command to switch a mmc device to enhanced mode Sascha Hauer
2018-10-02  9:03   ` [PATCH v2] " Uwe Kleine-König
2018-01-22  8:48 ` [PATCH v2 1/2] mci: drop unused parameter from mci_switch() Sascha Hauer

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=20181008082921.26922-2-u.kleine-koenig@pengutronix.de \
    --to=u.kleine-koenig@pengutronix.de \
    --cc=barebox@lists.infradead.org \
    /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