mmc: Add support for enumerating MMC card in a given mode using mmc command

Add support for enumerating MMC card in a given mode using mmc rescan and
mmc dev commands. The speed mode is provided as the last argument in these
commands and is indicated using the index from enum bus_mode in
include/mmc.h. A speed mode can be set only if it has already been enabled
in the device tree.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>

2 files changed, 54 insertions, 8 deletions

diff --git a/cmd/Kconfig b/cmd/Kconfig
index ffef3cc76c..3a857b3f6e 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -2389,4 +2389,14 @@ config CMD_UBIFS
 	help
 	  UBIFS is a file system for flash devices which works on top of UBI.
 
+config MMC_SPEED_MODE_SET
+	bool "set speed mode using mmc command"
+	depends on CMD_MMC
+	default n
+	help
+	  Enable setting speed mode using mmc rescan and mmc dev commands.
+	  The speed mode is provided as the last argument in these commands
+	  and is indicated using the index from enum bus_mode in
+	  include/mmc.h. A speed mode can be set only if it has already
+	  been enabled in the device tree.
 endmenu
diff --git a/cmd/mmc.c b/cmd/mmc.c
index c67ad76242..f1e30d0cf6 100644
--- a/cmd/mmc.c
+++ b/cmd/mmc.c
@@ -120,7 +120,9 @@ static void print_mmcinfo(struct mmc *mmc)
 		}
 	}
 }
-static struct mmc *init_mmc_device(int dev, bool force_init)
+
+static struct mmc *__init_mmc_device(int dev, bool force_init,
+				     enum bus_mode speed_mode)
 {
 	struct mmc *mmc;
 	mmc = find_mmc_device(dev);
@@ -134,6 +136,10 @@ static struct mmc *init_mmc_device(int dev, bool force_init)
 
 	if (force_init)
 		mmc->has_init = 0;
+
+	if (IS_ENABLED(CONFIG_MMC_SPEED_MODE_SET))
+		mmc->user_speed_mode = speed_mode;
+
 	if (mmc_init(mmc))
 		return NULL;
 
@@ -145,6 +151,11 @@ static struct mmc *init_mmc_device(int dev, bool force_init)
 	return mmc;
 }
 
+static struct mmc *init_mmc_device(int dev, bool force_init)
+{
+	return __init_mmc_device(dev, force_init, MMC_MODES_END);
+}
+
 static int do_mmcinfo(struct cmd_tbl *cmdtp, int flag, int argc,
 		      char *const argv[])
 {
@@ -482,8 +493,17 @@ static int do_mmc_rescan(struct cmd_tbl *cmdtp, int flag,
 			 int argc, char *const argv[])
 {
 	struct mmc *mmc;
+	enum bus_mode speed_mode = MMC_MODES_END;
+
+	if (argc == 1) {
+		mmc = init_mmc_device(curr_device, true);
+	} else if (argc == 2) {
+		speed_mode = (int)dectoul(argv[1], NULL);
+		mmc = __init_mmc_device(curr_device, true, speed_mode);
+	} else {
+		return CMD_RET_USAGE;
+	}
 
-	mmc = init_mmc_device(curr_device, true);
 	if (!mmc)
 		return CMD_RET_FAILURE;
 
@@ -515,11 +535,14 @@ static int do_mmc_dev(struct cmd_tbl *cmdtp, int flag,
 {
 	int dev, part = 0, ret;
 	struct mmc *mmc;
+	enum bus_mode speed_mode = MMC_MODES_END;
 
 	if (argc == 1) {
 		dev = curr_device;
+		mmc = init_mmc_device(dev, true);
 	} else if (argc == 2) {
-		dev = dectoul(argv[1], NULL);
+		dev = (int)dectoul(argv[1], NULL);
+		mmc = init_mmc_device(dev, true);
 	} else if (argc == 3) {
 		dev = (int)dectoul(argv[1], NULL);
 		part = (int)dectoul(argv[2], NULL);
@@ -528,11 +551,21 @@ static int do_mmc_dev(struct cmd_tbl *cmdtp, int flag,
 			       PART_ACCESS_MASK);
 			return CMD_RET_FAILURE;
 		}
+		mmc = init_mmc_device(dev, true);
+	} else if (argc == 4) {
+		dev = (int)dectoul(argv[1], NULL);
+		part = (int)dectoul(argv[2], NULL);
+		if (part > PART_ACCESS_MASK) {
+			printf("#part_num shouldn't be larger than %d\n",
+			       PART_ACCESS_MASK);
+			return CMD_RET_FAILURE;
+		}
+		speed_mode = (int)dectoul(argv[3], NULL);
+		mmc = __init_mmc_device(dev, true, speed_mode);
 	} else {
 		return CMD_RET_USAGE;
 	}
 
-	mmc = init_mmc_device(dev, true);
 	if (!mmc)
 		return CMD_RET_FAILURE;
 
@@ -983,9 +1016,9 @@ static struct cmd_tbl cmd_mmc[] = {
 #if CONFIG_IS_ENABLED(CMD_MMC_SWRITE)
 	U_BOOT_CMD_MKENT(swrite, 3, 0, do_mmc_sparse_write, "", ""),
 #endif
-	U_BOOT_CMD_MKENT(rescan, 1, 1, do_mmc_rescan, "", ""),
+	U_BOOT_CMD_MKENT(rescan, 2, 1, do_mmc_rescan, "", ""),
 	U_BOOT_CMD_MKENT(part, 1, 1, do_mmc_part, "", ""),
-	U_BOOT_CMD_MKENT(dev, 3, 0, do_mmc_dev, "", ""),
+	U_BOOT_CMD_MKENT(dev, 4, 0, do_mmc_dev, "", ""),
 	U_BOOT_CMD_MKENT(list, 1, 1, do_mmc_list, "", ""),
 #if CONFIG_IS_ENABLED(MMC_HW_PARTITIONING)
 	U_BOOT_CMD_MKENT(hwpartition, 28, 0, do_mmc_hwpartition, "", ""),
@@ -1042,9 +1075,12 @@ U_BOOT_CMD(
 	"mmc swrite addr blk#\n"
 #endif
 	"mmc erase blk# cnt\n"
-	"mmc rescan\n"
+	"mmc rescan [mode]\n"
 	"mmc part - lists available partition on current mmc device\n"
-	"mmc dev [dev] [part] - show or set current mmc device [partition]\n"
+	"mmc dev [dev] [part] [mode] - show or set current mmc device [partition] and set mode\n"
+	"  - the required speed mode is passed as the index from the following list\n"
+	"    [MMC_LEGACY, MMC_HS, SD_HS, MMC_HS_52, MMC_DDR_52, UHS_SDR12, UHS_SDR25,\n"
+	"    UHS_SDR50, UHS_DDR50, UHS_SDR104, MMC_HS_200, MMC_HS_400, MMC_HS_400_ES]\n"
 	"mmc list - lists available devices\n"
 	"mmc wp - power on write protect boot partitions\n"
 #if CONFIG_IS_ENABLED(MMC_HW_PARTITIONING)