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