[u-boot.git] / cmd / bcb.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2019 Eugeniu Rosca <[email protected]>
 *
 * Command to read/modify/write Android BCB fields
 */

#include <android_bootloader_message.h>
#include <bcb.h>
#include <command.h>
#include <common.h>
#include <display_options.h>
#include <log.h>
#include <part.h>
#include <malloc.h>
#include <memalign.h>

enum bcb_cmd {
	BCB_CMD_LOAD,
	BCB_CMD_FIELD_SET,
	BCB_CMD_FIELD_CLEAR,
	BCB_CMD_FIELD_TEST,
	BCB_CMD_FIELD_DUMP,
	BCB_CMD_STORE,
};

static int bcb_dev = -1;
static int bcb_part = -1;
static struct bootloader_message bcb __aligned(ARCH_DMA_MINALIGN) = { { 0 } };

static int bcb_cmd_get(char *cmd)
{
	if (!strcmp(cmd, "load"))
		return BCB_CMD_LOAD;
	if (!strcmp(cmd, "set"))
		return BCB_CMD_FIELD_SET;
	if (!strcmp(cmd, "clear"))
		return BCB_CMD_FIELD_CLEAR;
	if (!strcmp(cmd, "test"))
		return BCB_CMD_FIELD_TEST;
	if (!strcmp(cmd, "store"))
		return BCB_CMD_STORE;
	if (!strcmp(cmd, "dump"))
		return BCB_CMD_FIELD_DUMP;
	else
		return -1;
}

static int bcb_is_misused(int argc, char *const argv[])
{
	int cmd = bcb_cmd_get(argv[0]);

	switch (cmd) {
	case BCB_CMD_LOAD:
	case BCB_CMD_FIELD_SET:
		if (argc != 3)
			goto err;
		break;
	case BCB_CMD_FIELD_TEST:
		if (argc != 4)
			goto err;
		break;
	case BCB_CMD_FIELD_CLEAR:
		if (argc != 1 && argc != 2)
			goto err;
		break;
	case BCB_CMD_STORE:
		if (argc != 1)
			goto err;
		break;
	case BCB_CMD_FIELD_DUMP:
		if (argc != 2)
			goto err;
		break;
	default:
		printf("Error: 'bcb %s' not supported\n", argv[0]);
		return -1;
	}

	if (cmd != BCB_CMD_LOAD && (bcb_dev < 0 || bcb_part < 0)) {
		printf("Error: Please, load BCB first!\n");
		return -1;
	}

	return 0;
err:
	printf("Error: Bad usage of 'bcb %s'\n", argv[0]);

	return -1;
}

static int bcb_field_get(char *name, char **fieldp, int *sizep)
{
	if (!strcmp(name, "command")) {
		*fieldp = bcb.command;
		*sizep = sizeof(bcb.command);
	} else if (!strcmp(name, "status")) {
		*fieldp = bcb.status;
		*sizep = sizeof(bcb.status);
	} else if (!strcmp(name, "recovery")) {
		*fieldp = bcb.recovery;
		*sizep = sizeof(bcb.recovery);
	} else if (!strcmp(name, "stage")) {
		*fieldp = bcb.stage;
		*sizep = sizeof(bcb.stage);
	} else if (!strcmp(name, "reserved")) {
		*fieldp = bcb.reserved;
		*sizep = sizeof(bcb.reserved);
	} else {
		printf("Error: Unknown bcb field '%s'\n", name);
		return -1;
	}

	return 0;
}

static int __bcb_load(int devnum, const char *partp)
{
	struct blk_desc *desc;
	struct disk_partition info;
	u64 cnt;
	char *endp;
	int part, ret;

	desc = blk_get_devnum_by_type(IF_TYPE_MMC, devnum);
	if (!desc) {
		ret = -ENODEV;
		goto err_read_fail;
	}

	part = simple_strtoul(partp, &endp, 0);
	if (*endp == '\0') {
		ret = part_get_info(desc, part, &info);
		if (ret)
			goto err_read_fail;
	} else {
		part = part_get_info_by_name(desc, partp, &info);
		if (part < 0) {
			ret = part;
			goto err_read_fail;
		}
	}

	cnt = DIV_ROUND_UP(sizeof(struct bootloader_message), info.blksz);
	if (cnt > info.size)
		goto err_too_small;

	if (blk_dread(desc, info.start, cnt, &bcb) != cnt) {
		ret = -EIO;
		goto err_read_fail;
	}

	bcb_dev = desc->devnum;
	bcb_part = part;
	debug("%s: Loaded from mmc %d:%d\n", __func__, bcb_dev, bcb_part);

	return CMD_RET_SUCCESS;
err_read_fail:
	printf("Error: mmc %d:%s read failed (%d)\n", devnum, partp, ret);
	goto err;
err_too_small:
	printf("Error: mmc %d:%s too small!", devnum, partp);
	goto err;
err:
	bcb_dev = -1;
	bcb_part = -1;

	return CMD_RET_FAILURE;
}

static int do_bcb_load(struct cmd_tbl *cmdtp, int flag, int argc,
		       char * const argv[])
{
	char *endp;
	int devnum = simple_strtoul(argv[1], &endp, 0);

	if (*endp != '\0') {
		printf("Error: Device id '%s' not a number\n", argv[1]);
		return CMD_RET_FAILURE;
	}

	return __bcb_load(devnum, argv[2]);
}

static int __bcb_set(char *fieldp, const char *valp)
{
	int size, len;
	char *field, *str, *found, *tmp;

	if (bcb_field_get(fieldp, &field, &size))
		return CMD_RET_FAILURE;

	len = strlen(valp);
	if (len >= size) {
		printf("Error: sizeof('%s') = %d >= %d = sizeof(bcb.%s)\n",
		       valp, len, size, fieldp);
		return CMD_RET_FAILURE;
	}
	str = strdup(valp);
	if (!str) {
		printf("Error: Out of memory while strdup\n");
		return CMD_RET_FAILURE;
	}

	tmp = str;
	field[0] = '\0';
	while ((found = strsep(&tmp, ":"))) {
		if (field[0] != '\0')
			strcat(field, "\n");
		strcat(field, found);
	}
	free(str);

	return CMD_RET_SUCCESS;
}

static int do_bcb_set(struct cmd_tbl *cmdtp, int flag, int argc,
		      char * const argv[])
{
	return __bcb_set(argv[1], argv[2]);
}

static int do_bcb_clear(struct cmd_tbl *cmdtp, int flag, int argc,
			char *const argv[])
{
	int size;
	char *field;

	if (argc == 1) {
		memset(&bcb, 0, sizeof(bcb));
		return CMD_RET_SUCCESS;
	}

	if (bcb_field_get(argv[1], &field, &size))
		return CMD_RET_FAILURE;

	memset(field, 0, size);

	return CMD_RET_SUCCESS;
}

static int do_bcb_test(struct cmd_tbl *cmdtp, int flag, int argc,
		       char *const argv[])
{
	int size;
	char *field;
	char *op = argv[2];

	if (bcb_field_get(argv[1], &field, &size))
		return CMD_RET_FAILURE;

	if (*op == '=' && *(op + 1) == '\0') {
		if (!strncmp(argv[3], field, size))
			return CMD_RET_SUCCESS;
		else
			return CMD_RET_FAILURE;
	} else if (*op == '~' && *(op + 1) == '\0') {
		if (!strstr(field, argv[3]))
			return CMD_RET_FAILURE;
		else
			return CMD_RET_SUCCESS;
	} else {
		printf("Error: Unknown operator '%s'\n", op);
	}

	return CMD_RET_FAILURE;
}

static int do_bcb_dump(struct cmd_tbl *cmdtp, int flag, int argc,
		       char *const argv[])
{
	int size;
	char *field;

	if (bcb_field_get(argv[1], &field, &size))
		return CMD_RET_FAILURE;

	print_buffer((ulong)field - (ulong)&bcb, (void *)field, 1, size, 16);

	return CMD_RET_SUCCESS;
}

static int __bcb_store(void)
{
	struct blk_desc *desc;
	struct disk_partition info;
	u64 cnt;
	int ret;

	desc = blk_get_devnum_by_type(IF_TYPE_MMC, bcb_dev);
	if (!desc) {
		ret = -ENODEV;
		goto err;
	}

	ret = part_get_info(desc, bcb_part, &info);
	if (ret)
		goto err;

	cnt = DIV_ROUND_UP(sizeof(struct bootloader_message), info.blksz);

	if (blk_dwrite(desc, info.start, cnt, &bcb) != cnt) {
		ret = -EIO;
		goto err;
	}

	return CMD_RET_SUCCESS;
err:
	printf("Error: mmc %d:%d write failed (%d)\n", bcb_dev, bcb_part, ret);

	return CMD_RET_FAILURE;
}

static int do_bcb_store(struct cmd_tbl *cmdtp, int flag, int argc,
			char * const argv[])
{
	return __bcb_store();
}

int bcb_write_reboot_reason(int devnum, char *partp, const char *reasonp)
{
	int ret;

	ret = __bcb_load(devnum, partp);
	if (ret != CMD_RET_SUCCESS)
		return ret;

	ret = __bcb_set("command", reasonp);
	if (ret != CMD_RET_SUCCESS)
		return ret;

	ret = __bcb_store();
	if (ret != CMD_RET_SUCCESS)
		return ret;

	return 0;
}

static struct cmd_tbl cmd_bcb_sub[] = {
	U_BOOT_CMD_MKENT(load, CONFIG_SYS_MAXARGS, 1, do_bcb_load, "", ""),
	U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 1, do_bcb_set, "", ""),
	U_BOOT_CMD_MKENT(clear, CONFIG_SYS_MAXARGS, 1, do_bcb_clear, "", ""),
	U_BOOT_CMD_MKENT(test, CONFIG_SYS_MAXARGS, 1, do_bcb_test, "", ""),
	U_BOOT_CMD_MKENT(dump, CONFIG_SYS_MAXARGS, 1, do_bcb_dump, "", ""),
	U_BOOT_CMD_MKENT(store, CONFIG_SYS_MAXARGS, 1, do_bcb_store, "", ""),
};

static int do_bcb(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
	struct cmd_tbl *c;

	if (argc < 2)
		return CMD_RET_USAGE;

	argc--;
	argv++;

	c = find_cmd_tbl(argv[0], cmd_bcb_sub, ARRAY_SIZE(cmd_bcb_sub));
	if (!c)
		return CMD_RET_USAGE;

	if (bcb_is_misused(argc, argv)) {
		/*
		 * We try to improve the user experience by reporting the
		 * root-cause of misusage, so don't return CMD_RET_USAGE,
		 * since the latter prints out the full-blown help text
		 */
		return CMD_RET_FAILURE;
	}

	return c->cmd(cmdtp, flag, argc, argv);
}

U_BOOT_CMD(
	bcb, CONFIG_SYS_MAXARGS, 1, do_bcb,
	"Load/set/clear/test/dump/store Android BCB fields",
	"load  <dev> <part>       - load  BCB from mmc <dev>:<part>\n"
	"bcb set   <field> <val>      - set   BCB <field> to <val>\n"
	"bcb clear [<field>]          - clear BCB <field> or all fields\n"
	"bcb test  <field> <op> <val> - test  BCB <field> against <val>\n"
	"bcb dump  <field>            - dump  BCB <field>\n"
	"bcb store                    - store BCB back to mmc\n"
	"\n"
	"Legend:\n"
	"<dev>   - MMC device index containing the BCB partition\n"
	"<part>  - MMC partition index or name containing the BCB\n"
	"<field> - one of {command,status,recovery,stage,reserved}\n"
	"<op>    - the binary operator used in 'bcb test':\n"
	"          '=' returns true if <val> matches the string stored in <field>\n"
	"          '~' returns true if <val> matches a subset of <field>'s string\n"
	"<val>   - string/text provided as input to bcb {set,test}\n"
	"          NOTE: any ':' character in <val> will be replaced by line feed\n"
	"          during 'bcb set' and used as separator by upper layers\n"
);
Commit	Line	Data
db7b7a05 ER	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Copyright (C) 2019 Eugeniu Rosca <[email protected]>
	4	*
	5	* Command to read/modify/write Android BCB fields
	6	*/
	7
	8	#include <android_bootloader_message.h>
e74670ad	9	#include <bcb.h>
db7b7a05 ER	10	#include <command.h>
db7b7a05 ER	11	#include <common.h>
4e4bf944	12	#include <display_options.h>
f7ae49fc	13	#include <log.h>
e6f6f9e6	14	#include <part.h>
bafdf4ca	15	#include <malloc.h>
18956cd4	16	#include <memalign.h>
db7b7a05 ER	17
	18	enum bcb_cmd {
	19	BCB_CMD_LOAD,
	20	BCB_CMD_FIELD_SET,
	21	BCB_CMD_FIELD_CLEAR,
	22	BCB_CMD_FIELD_TEST,
	23	BCB_CMD_FIELD_DUMP,
	24	BCB_CMD_STORE,
	25	};
	26
	27	static int bcb_dev = -1;
	28	static int bcb_part = -1;
18956cd4	29	static struct bootloader_message bcb __aligned(ARCH_DMA_MINALIGN) = { { 0 } };
db7b7a05 ER	30
	31	static int bcb_cmd_get(char *cmd)
	32	{
739168cf	33	if (!strcmp(cmd, "load"))
db7b7a05	34	return BCB_CMD_LOAD;
739168cf	35	if (!strcmp(cmd, "set"))
db7b7a05	36	return BCB_CMD_FIELD_SET;
739168cf	37	if (!strcmp(cmd, "clear"))
db7b7a05	38	return BCB_CMD_FIELD_CLEAR;
739168cf	39	if (!strcmp(cmd, "test"))
db7b7a05	40	return BCB_CMD_FIELD_TEST;
739168cf	41	if (!strcmp(cmd, "store"))
db7b7a05	42	return BCB_CMD_STORE;
739168cf	43	if (!strcmp(cmd, "dump"))
db7b7a05 ER	44	return BCB_CMD_FIELD_DUMP;
	45	else
	46	return -1;
	47	}
	48
	49	static int bcb_is_misused(int argc, char *const argv[])
	50	{
	51	int cmd = bcb_cmd_get(argv[0]);
	52
	53	switch (cmd) {
	54	case BCB_CMD_LOAD:
db7b7a05 ER	55	case BCB_CMD_FIELD_SET:
	56	if (argc != 3)
	57	goto err;
	58	break;
	59	case BCB_CMD_FIELD_TEST:
	60	if (argc != 4)
	61	goto err;
	62	break;
	63	case BCB_CMD_FIELD_CLEAR:
	64	if (argc != 1 && argc != 2)
	65	goto err;
	66	break;
	67	case BCB_CMD_STORE:
	68	if (argc != 1)
	69	goto err;
	70	break;
	71	case BCB_CMD_FIELD_DUMP:
	72	if (argc != 2)
	73	goto err;
	74	break;
	75	default:
	76	printf("Error: 'bcb %s' not supported\n", argv[0]);
	77	return -1;
	78	}
	79
	80	if (cmd != BCB_CMD_LOAD && (bcb_dev < 0 \|\| bcb_part < 0)) {
	81	printf("Error: Please, load BCB first!\n");
	82	return -1;
	83	}
	84
	85	return 0;
	86	err:
	87	printf("Error: Bad usage of 'bcb %s'\n", argv[0]);
	88
	89	return -1;
	90	}
	91
37f1811a	92	static int bcb_field_get(char name, char fieldp, int sizep)
db7b7a05	93	{
739168cf	94	if (!strcmp(name, "command")) {
37f1811a ER	95	*fieldp = bcb.command;
37f1811a ER	96	*sizep = sizeof(bcb.command);
739168cf	97	} else if (!strcmp(name, "status")) {
37f1811a ER	98	*fieldp = bcb.status;
37f1811a ER	99	*sizep = sizeof(bcb.status);
739168cf	100	} else if (!strcmp(name, "recovery")) {
37f1811a ER	101	*fieldp = bcb.recovery;
37f1811a ER	102	*sizep = sizeof(bcb.recovery);
739168cf	103	} else if (!strcmp(name, "stage")) {
37f1811a ER	104	*fieldp = bcb.stage;
37f1811a ER	105	*sizep = sizeof(bcb.stage);
739168cf	106	} else if (!strcmp(name, "reserved")) {
37f1811a ER	107	*fieldp = bcb.reserved;
37f1811a ER	108	*sizep = sizeof(bcb.reserved);
db7b7a05 ER	109	} else {
	110	printf("Error: Unknown bcb field '%s'\n", name);
	111	return -1;
	112	}
	113
	114	return 0;
	115	}
	116
24e85bbd	117	static int __bcb_load(int devnum, const char *partp)
db7b7a05 ER	118	{
db7b7a05 ER	119	struct blk_desc *desc;
0528979f	120	struct disk_partition info;
db7b7a05 ER	121	u64 cnt;
	122	char *endp;
	123	int part, ret;
	124
24e85bbd ER	125	desc = blk_get_devnum_by_type(IF_TYPE_MMC, devnum);
	126	if (!desc) {
	127	ret = -ENODEV;
37f1811a	128	goto err_read_fail;
24e85bbd	129	}
db7b7a05	130
24e85bbd	131	part = simple_strtoul(partp, &endp, 0);
db7b7a05 ER	132	if (*endp == '\0') {
	133	ret = part_get_info(desc, part, &info);
	134	if (ret)
37f1811a	135	goto err_read_fail;
db7b7a05	136	} else {
24e85bbd	137	part = part_get_info_by_name(desc, partp, &info);
db7b7a05 ER	138	if (part < 0) {
db7b7a05 ER	139	ret = part;
37f1811a	140	goto err_read_fail;
db7b7a05 ER	141	}
	142	}
	143
	144	cnt = DIV_ROUND_UP(sizeof(struct bootloader_message), info.blksz);
	145	if (cnt > info.size)
37f1811a	146	goto err_too_small;
db7b7a05 ER	147
	148	if (blk_dread(desc, info.start, cnt, &bcb) != cnt) {
	149	ret = -EIO;
37f1811a	150	goto err_read_fail;
db7b7a05 ER	151	}
	152
	153	bcb_dev = desc->devnum;
	154	bcb_part = part;
	155	debug("%s: Loaded from mmc %d:%d\n", __func__, bcb_dev, bcb_part);
	156
	157	return CMD_RET_SUCCESS;
37f1811a	158	err_read_fail:
24e85bbd	159	printf("Error: mmc %d:%s read failed (%d)\n", devnum, partp, ret);
db7b7a05	160	goto err;
37f1811a	161	err_too_small:
24e85bbd	162	printf("Error: mmc %d:%s too small!", devnum, partp);
db7b7a05 ER	163	goto err;
	164	err:
	165	bcb_dev = -1;
	166	bcb_part = -1;
	167
	168	return CMD_RET_FAILURE;
	169	}
	170
24e85bbd ER	171	static int do_bcb_load(struct cmd_tbl *cmdtp, int flag, int argc,
	172	char * const argv[])
	173	{
	174	char *endp;
	175	int devnum = simple_strtoul(argv[1], &endp, 0);
	176
	177	if (*endp != '\0') {
	178	printf("Error: Device id '%s' not a number\n", argv[1]);
	179	return CMD_RET_FAILURE;
	180	}
	181
	182	return __bcb_load(devnum, argv[2]);
	183	}
	184
bafdf4ca	185	static int __bcb_set(char fieldp, const char valp)
db7b7a05 ER	186	{
db7b7a05 ER	187	int size, len;
bafdf4ca	188	char field, str, found, tmp;
db7b7a05	189
02ebe6de	190	if (bcb_field_get(fieldp, &field, &size))
db7b7a05 ER	191	return CMD_RET_FAILURE;
db7b7a05 ER	192
02ebe6de	193	len = strlen(valp);
db7b7a05 ER	194	if (len >= size) {
db7b7a05 ER	195	printf("Error: sizeof('%s') = %d >= %d = sizeof(bcb.%s)\n",
02ebe6de	196	valp, len, size, fieldp);
db7b7a05 ER	197	return CMD_RET_FAILURE;
db7b7a05 ER	198	}
bafdf4ca ER	199	str = strdup(valp);
	200	if (!str) {
	201	printf("Error: Out of memory while strdup\n");
	202	return CMD_RET_FAILURE;
	203	}
db7b7a05	204
bafdf4ca	205	tmp = str;
db7b7a05	206	field[0] = '\0';
bafdf4ca	207	while ((found = strsep(&tmp, ":"))) {
db7b7a05 ER	208	if (field[0] != '\0')
	209	strcat(field, "\n");
	210	strcat(field, found);
	211	}
bafdf4ca	212	free(str);
db7b7a05 ER	213
	214	return CMD_RET_SUCCESS;
	215	}
	216
02ebe6de ER	217	static int do_bcb_set(struct cmd_tbl *cmdtp, int flag, int argc,
	218	char * const argv[])
	219	{
	220	return __bcb_set(argv[1], argv[2]);
	221	}
	222
09140113 SG	223	static int do_bcb_clear(struct cmd_tbl *cmdtp, int flag, int argc,
09140113 SG	224	char *const argv[])
db7b7a05 ER	225	{
	226	int size;
	227	char *field;
	228
	229	if (argc == 1) {
	230	memset(&bcb, 0, sizeof(bcb));
	231	return CMD_RET_SUCCESS;
	232	}
	233
	234	if (bcb_field_get(argv[1], &field, &size))
	235	return CMD_RET_FAILURE;
	236
	237	memset(field, 0, size);
	238
	239	return CMD_RET_SUCCESS;
	240	}
	241
09140113 SG	242	static int do_bcb_test(struct cmd_tbl *cmdtp, int flag, int argc,
09140113 SG	243	char *const argv[])
db7b7a05 ER	244	{
	245	int size;
	246	char *field;
	247	char *op = argv[2];
	248
	249	if (bcb_field_get(argv[1], &field, &size))
	250	return CMD_RET_FAILURE;
	251
	252	if (op == '=' && (op + 1) == '\0') {
	253	if (!strncmp(argv[3], field, size))
	254	return CMD_RET_SUCCESS;
	255	else
	256	return CMD_RET_FAILURE;
	257	} else if (op == '~' && (op + 1) == '\0') {
	258	if (!strstr(field, argv[3]))
	259	return CMD_RET_FAILURE;
	260	else
	261	return CMD_RET_SUCCESS;
	262	} else {
	263	printf("Error: Unknown operator '%s'\n", op);
	264	}
	265
	266	return CMD_RET_FAILURE;
	267	}
	268
09140113 SG	269	static int do_bcb_dump(struct cmd_tbl *cmdtp, int flag, int argc,
09140113 SG	270	char *const argv[])
db7b7a05 ER	271	{
	272	int size;
	273	char *field;
	274
	275	if (bcb_field_get(argv[1], &field, &size))
	276	return CMD_RET_FAILURE;
	277
	278	print_buffer((ulong)field - (ulong)&bcb, (void *)field, 1, size, 16);
	279
	280	return CMD_RET_SUCCESS;
	281	}
	282
e2ffb3be	283	static int __bcb_store(void)
db7b7a05 ER	284	{
db7b7a05 ER	285	struct blk_desc *desc;
0528979f	286	struct disk_partition info;
db7b7a05 ER	287	u64 cnt;
	288	int ret;
	289
	290	desc = blk_get_devnum_by_type(IF_TYPE_MMC, bcb_dev);
	291	if (!desc) {
	292	ret = -ENODEV;
	293	goto err;
	294	}
	295
	296	ret = part_get_info(desc, bcb_part, &info);
	297	if (ret)
	298	goto err;
	299
	300	cnt = DIV_ROUND_UP(sizeof(struct bootloader_message), info.blksz);
	301
	302	if (blk_dwrite(desc, info.start, cnt, &bcb) != cnt) {
	303	ret = -EIO;
	304	goto err;
	305	}
	306
	307	return CMD_RET_SUCCESS;
	308	err:
	309	printf("Error: mmc %d:%d write failed (%d)\n", bcb_dev, bcb_part, ret);
	310
	311	return CMD_RET_FAILURE;
	312	}
	313
e2ffb3be ER	314	static int do_bcb_store(struct cmd_tbl *cmdtp, int flag, int argc,
	315	char * const argv[])
	316	{
	317	return __bcb_store();
	318	}
	319
bafdf4ca	320	int bcb_write_reboot_reason(int devnum, char partp, const char reasonp)
e74670ad ER	321	{
	322	int ret;
	323
	324	ret = __bcb_load(devnum, partp);
	325	if (ret != CMD_RET_SUCCESS)
	326	return ret;
	327
	328	ret = __bcb_set("command", reasonp);
	329	if (ret != CMD_RET_SUCCESS)
	330	return ret;
	331
	332	ret = __bcb_store();
	333	if (ret != CMD_RET_SUCCESS)
	334	return ret;
	335
	336	return 0;
	337	}
	338
09140113	339	static struct cmd_tbl cmd_bcb_sub[] = {
db7b7a05 ER	340	U_BOOT_CMD_MKENT(load, CONFIG_SYS_MAXARGS, 1, do_bcb_load, "", ""),
	341	U_BOOT_CMD_MKENT(set, CONFIG_SYS_MAXARGS, 1, do_bcb_set, "", ""),
	342	U_BOOT_CMD_MKENT(clear, CONFIG_SYS_MAXARGS, 1, do_bcb_clear, "", ""),
	343	U_BOOT_CMD_MKENT(test, CONFIG_SYS_MAXARGS, 1, do_bcb_test, "", ""),
	344	U_BOOT_CMD_MKENT(dump, CONFIG_SYS_MAXARGS, 1, do_bcb_dump, "", ""),
	345	U_BOOT_CMD_MKENT(store, CONFIG_SYS_MAXARGS, 1, do_bcb_store, "", ""),
	346	};
	347
09140113	348	static int do_bcb(struct cmd_tbl cmdtp, int flag, int argc, char const argv[])
db7b7a05	349	{
09140113	350	struct cmd_tbl *c;
db7b7a05 ER	351
	352	if (argc < 2)
	353	return CMD_RET_USAGE;
	354
	355	argc--;
	356	argv++;
	357
	358	c = find_cmd_tbl(argv[0], cmd_bcb_sub, ARRAY_SIZE(cmd_bcb_sub));
	359	if (!c)
	360	return CMD_RET_USAGE;
	361
	362	if (bcb_is_misused(argc, argv)) {
37f1811a ER	363	/*
37f1811a ER	364	* We try to improve the user experience by reporting the
db7b7a05 ER	365	* root-cause of misusage, so don't return CMD_RET_USAGE,
	366	* since the latter prints out the full-blown help text
	367	*/
	368	return CMD_RET_FAILURE;
	369	}
	370
	371	return c->cmd(cmdtp, flag, argc, argv);
	372	}
	373
	374	U_BOOT_CMD(
	375	bcb, CONFIG_SYS_MAXARGS, 1, do_bcb,
	376	"Load/set/clear/test/dump/store Android BCB fields",
	377	"load <dev> <part> - load BCB from mmc <dev>:<part>\n"
	378	"bcb set <field> <val> - set BCB <field> to <val>\n"
	379	"bcb clear [<field>] - clear BCB <field> or all fields\n"
	380	"bcb test <field> <op> <val> - test BCB <field> against <val>\n"
	381	"bcb dump <field> - dump BCB <field>\n"
	382	"bcb store - store BCB back to mmc\n"
	383	"\n"
	384	"Legend:\n"
	385	"<dev> - MMC device index containing the BCB partition\n"
	386	"<part> - MMC partition index or name containing the BCB\n"
	387	"<field> - one of {command,status,recovery,stage,reserved}\n"
	388	"<op> - the binary operator used in 'bcb test':\n"
	389	" '=' returns true if <val> matches the string stored in <field>\n"
	390	" '~' returns true if <val> matches a subset of <field>'s string\n"
	391	"<val> - string/text provided as input to bcb {set,test}\n"
	392	" NOTE: any ':' character in <val> will be replaced by line feed\n"
	393	" during 'bcb set' and used as separator by upper layers\n"
	394	);