[J-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>

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