cmd_i2c.c

来自「U-boot源码 ARM7启动代码」· C语言 代码 · 共 1,024 行 · 第 1/2 页

			nbytes = endp - console_buffer;
			if (nbytes) {
#ifdef CONFIG_BOOT_RETRY_TIME
				/*
				 * good enough to not time out
				 */
				reset_cmd_timeout();
#endif
				if (i2c_write(chip, addr, alen, (uchar *)&data, size) != 0)
					puts ("Error writing the chip.\n");
#ifdef CFG_EEPROM_PAGE_WRITE_DELAY_MS
				udelay(CFG_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
#endif
				if (incrflag)
					addr += size;
			}
		}
	} while (nbytes);

	chip = i2c_mm_last_chip;
	addr = i2c_mm_last_addr;
	alen = i2c_mm_last_alen;

	return 0;
}

/*
 * Syntax:
 *	iprobe {addr}{.0, .1, .2}
 */
int do_i2c_probe (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	int j;
#if defined(CFG_I2C_NOPROBES)
	int k, skip;
	uchar bus = GET_BUS_NUM;
#endif	/* NOPROBES */

	puts ("Valid chip addresses:");
	for (j = 0; j < 128; j++) {
#if defined(CFG_I2C_NOPROBES)
		skip = 0;
		for (k=0; k < NUM_ELEMENTS_NOPROBE; k++) {
			if (COMPARE_BUS(bus, k) && COMPARE_ADDR(j, k)) {
				skip = 1;
				break;
			}
		}
		if (skip)
			continue;
#endif
		if (i2c_probe(j) == 0)
			printf(" %02X", j);
	}
	putc ('\n');

#if defined(CFG_I2C_NOPROBES)
	puts ("Excluded chip addresses:");
	for (k=0; k < NUM_ELEMENTS_NOPROBE; k++) {
		if (COMPARE_BUS(bus,k))
			printf(" %02X", NO_PROBE_ADDR(k));
	}
	putc ('\n');
#endif

	return 0;
}


/*
 * Syntax:
 *	iloop {i2c_chip} {addr}{.0, .1, .2} [{length}] [{delay}]
 *	{length} - Number of bytes to read
 *	{delay}  - A DECIMAL number and defaults to 1000 uSec
 */
int do_i2c_loop(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	u_char	chip;
	ulong	alen;
	uint	addr;
	uint	length;
	u_char	bytes[16];
	int	delay;
	int	j;

	if (argc < 3) {
		printf ("Usage:\n%s\n", cmdtp->usage);
		return 1;
	}

	/*
	 * Chip is always specified.
	 */
	chip = simple_strtoul(argv[1], NULL, 16);

	/*
	 * Address is always specified.
	 */
	addr = simple_strtoul(argv[2], NULL, 16);
	alen = 1;
	for (j = 0; j < 8; j++) {
		if (argv[2][j] == '.') {
			alen = argv[2][j+1] - '0';
			if (alen > 4) {
				printf ("Usage:\n%s\n", cmdtp->usage);
				return 1;
			}
			break;
		} else if (argv[2][j] == '\0')
			break;
	}

	/*
	 * Length is the number of objects, not number of bytes.
	 */
	length = 1;
	length = simple_strtoul(argv[3], NULL, 16);
	if (length > sizeof(bytes))
		length = sizeof(bytes);

	/*
	 * The delay time (uSec) is optional.
	 */
	delay = 1000;
	if (argc > 3)
		delay = simple_strtoul(argv[4], NULL, 10);
	/*
	 * Run the loop...
	 */
	while (1) {
		if (i2c_read(chip, addr, alen, bytes, length) != 0)
			puts ("Error reading the chip.\n");
		udelay(delay);
	}

	/* NOTREACHED */
	return 0;
}


/*
 * The SDRAM command is separately configured because many
 * (most?) embedded boards don't use SDRAM DIMMs.
 */
#if defined(CONFIG_CMD_SDRAM)

/*
 * Syntax:
 *	sdram {i2c_chip}
 */
int do_sdram  ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	u_char	chip;
	u_char	data[128];
	u_char	cksum;
	int	j;

	if (argc < 2) {
		printf ("Usage:\n%s\n", cmdtp->usage);
		return 1;
	}
	/*
	 * Chip is always specified.
 	 */
	chip = simple_strtoul(argv[1], NULL, 16);

	if (i2c_read(chip, 0, 1, data, sizeof(data)) != 0) {
		puts ("No SDRAM Serial Presence Detect found.\n");
		return 1;
	}

	cksum = 0;
	for (j = 0; j < 63; j++) {
		cksum += data[j];
	}
	if (cksum != data[63]) {
		printf ("WARNING: Configuration data checksum failure:\n"
			"  is 0x%02x, calculated 0x%02x\n",
			data[63], cksum);
	}
	printf("SPD data revision            %d.%d\n",
		(data[62] >> 4) & 0x0F, data[62] & 0x0F);
	printf("Bytes used                   0x%02X\n", data[0]);
	printf("Serial memory size           0x%02X\n", 1 << data[1]);
	puts ("Memory type                  ");
	switch(data[2]) {
		case 2:  puts ("EDO\n");	break;
		case 4:  puts ("SDRAM\n");	break;
		case 8:  puts ("DDR2\n");	break;
		default: puts ("unknown\n");	break;
	}
	puts ("Row address bits             ");
	if ((data[3] & 0x00F0) == 0)
		printf("%d\n", data[3] & 0x0F);
	else
		printf("%d/%d\n", data[3] & 0x0F, (data[3] >> 4) & 0x0F);
	puts ("Column address bits          ");
	if ((data[4] & 0x00F0) == 0)
		printf("%d\n", data[4] & 0x0F);
	else
		printf("%d/%d\n", data[4] & 0x0F, (data[4] >> 4) & 0x0F);
	printf("Module rows                  %d\n", data[5]);
	printf("Module data width            %d bits\n", (data[7] << 8) | data[6]);
	puts ("Interface signal levels      ");
	switch(data[8]) {
		case 0:  puts ("5.0v/TTL\n");	break;
		case 1:  puts ("LVTTL\n");	break;
		case 2:  puts ("HSTL 1.5\n");	break;
		case 3:  puts ("SSTL 3.3\n");	break;
		case 4:  puts ("SSTL 2.5\n");	break;
		case 5:  puts ("SSTL 1.8\n");	break;
		default: puts ("unknown\n");	break;
	}
	printf("SDRAM cycle time             %d.%d nS\n",
		(data[9] >> 4) & 0x0F, data[9] & 0x0F);
	printf("SDRAM access time            %d.%d nS\n",
		(data[10] >> 4) & 0x0F, data[10] & 0x0F);
	puts ("EDC configuration            ");
	switch(data[11]) {
		case 0:  puts ("None\n");	break;
		case 1:  puts ("Parity\n");	break;
		case 2:  puts ("ECC\n");	break;
		default: puts ("unknown\n");	break;
	}
	if ((data[12] & 0x80) == 0)
		puts ("No self refresh, rate        ");
	else
		puts ("Self refresh, rate           ");
	switch(data[12] & 0x7F) {
		case 0:  puts ("15.625uS\n");	break;
		case 1:  puts ("3.9uS\n");	break;
		case 2:  puts ("7.8uS\n");	break;
		case 3:  puts ("31.3uS\n");	break;
		case 4:  puts ("62.5uS\n");	break;
		case 5:  puts ("125uS\n");	break;
		default: puts ("unknown\n");	break;
	}
	printf("SDRAM width (primary)        %d\n", data[13] & 0x7F);
	if ((data[13] & 0x80) != 0) {
		printf("  (second bank)              %d\n",
			2 * (data[13] & 0x7F));
	}
	if (data[14] != 0) {
		printf("EDC width                    %d\n",
			data[14] & 0x7F);
		if ((data[14] & 0x80) != 0)
			printf("  (second bank)              %d\n",
				2 * (data[14] & 0x7F));
	}
	printf("Min clock delay, back-to-back random column addresses %d\n",
		data[15]);
	puts ("Burst length(s)             ");
	if (data[16] & 0x80) puts (" Page");
	if (data[16] & 0x08) puts (" 8");
	if (data[16] & 0x04) puts (" 4");
	if (data[16] & 0x02) puts (" 2");
	if (data[16] & 0x01) puts (" 1");
	putc ('\n');
	printf("Number of banks              %d\n", data[17]);
	puts ("CAS latency(s)              ");
	if (data[18] & 0x80) puts (" TBD");
	if (data[18] & 0x40) puts (" 7");
	if (data[18] & 0x20) puts (" 6");
	if (data[18] & 0x10) puts (" 5");
	if (data[18] & 0x08) puts (" 4");
	if (data[18] & 0x04) puts (" 3");
	if (data[18] & 0x02) puts (" 2");
	if (data[18] & 0x01) puts (" 1");
	putc ('\n');
	puts ("CS latency(s)               ");
	if (data[19] & 0x80) puts (" TBD");
	if (data[19] & 0x40) puts (" 6");
	if (data[19] & 0x20) puts (" 5");
	if (data[19] & 0x10) puts (" 4");
	if (data[19] & 0x08) puts (" 3");
	if (data[19] & 0x04) puts (" 2");
	if (data[19] & 0x02) puts (" 1");
	if (data[19] & 0x01) puts (" 0");
	putc ('\n');
	puts ("WE latency(s)               ");
	if (data[20] & 0x80) puts (" TBD");
	if (data[20] & 0x40) puts (" 6");
	if (data[20] & 0x20) puts (" 5");
	if (data[20] & 0x10) puts (" 4");
	if (data[20] & 0x08) puts (" 3");
	if (data[20] & 0x04) puts (" 2");
	if (data[20] & 0x02) puts (" 1");
	if (data[20] & 0x01) puts (" 0");
	putc ('\n');
	puts ("Module attributes:\n");
	if (!data[21])       puts ("  (none)\n");
	if (data[21] & 0x80) puts ("  TBD (bit 7)\n");
	if (data[21] & 0x40) puts ("  Redundant row address\n");
	if (data[21] & 0x20) puts ("  Differential clock input\n");
	if (data[21] & 0x10) puts ("  Registerd DQMB inputs\n");
	if (data[21] & 0x08) puts ("  Buffered DQMB inputs\n");
	if (data[21] & 0x04) puts ("  On-card PLL\n");
	if (data[21] & 0x02) puts ("  Registered address/control lines\n");
	if (data[21] & 0x01) puts ("  Buffered address/control lines\n");
	puts ("Device attributes:\n");
	if (data[22] & 0x80) puts ("  TBD (bit 7)\n");
	if (data[22] & 0x40) puts ("  TBD (bit 6)\n");
	if (data[22] & 0x20) puts ("  Upper Vcc tolerance 5%\n");
	else                 puts ("  Upper Vcc tolerance 10%\n");
	if (data[22] & 0x10) puts ("  Lower Vcc tolerance 5%\n");
	else                 puts ("  Lower Vcc tolerance 10%\n");
	if (data[22] & 0x08) puts ("  Supports write1/read burst\n");
	if (data[22] & 0x04) puts ("  Supports precharge all\n");
	if (data[22] & 0x02) puts ("  Supports auto precharge\n");
	if (data[22] & 0x01) puts ("  Supports early RAS# precharge\n");
	printf("SDRAM cycle time (2nd highest CAS latency)        %d.%d nS\n",
		(data[23] >> 4) & 0x0F, data[23] & 0x0F);
	printf("SDRAM access from clock (2nd highest CAS latency) %d.%d nS\n",
		(data[24] >> 4) & 0x0F, data[24] & 0x0F);
	printf("SDRAM cycle time (3rd highest CAS latency)        %d.%d nS\n",
		(data[25] >> 4) & 0x0F, data[25] & 0x0F);
	printf("SDRAM access from clock (3rd highest CAS latency) %d.%d nS\n",
		(data[26] >> 4) & 0x0F, data[26] & 0x0F);
	printf("Minimum row precharge        %d nS\n", data[27]);
	printf("Row active to row active min %d nS\n", data[28]);
	printf("RAS to CAS delay min         %d nS\n", data[29]);
	printf("Minimum RAS pulse width      %d nS\n", data[30]);
	puts ("Density of each row         ");
	if (data[31] & 0x80) puts (" 512");
	if (data[31] & 0x40) puts (" 256");
	if (data[31] & 0x20) puts (" 128");
	if (data[31] & 0x10) puts (" 64");
	if (data[31] & 0x08) puts (" 32");
	if (data[31] & 0x04) puts (" 16");
	if (data[31] & 0x02) puts (" 8");
	if (data[31] & 0x01) puts (" 4");
	puts ("MByte\n");
	printf("Command and Address setup    %c%d.%d nS\n",
		(data[32] & 0x80) ? '-' : '+',
		(data[32] >> 4) & 0x07, data[32] & 0x0F);
	printf("Command and Address hold     %c%d.%d nS\n",
		(data[33] & 0x80) ? '-' : '+',
		(data[33] >> 4) & 0x07, data[33] & 0x0F);
	printf("Data signal input setup      %c%d.%d nS\n",
		(data[34] & 0x80) ? '-' : '+',
		(data[34] >> 4) & 0x07, data[34] & 0x0F);
	printf("Data signal input hold       %c%d.%d nS\n",
		(data[35] & 0x80) ? '-' : '+',
		(data[35] >> 4) & 0x07, data[35] & 0x0F);
	puts ("Manufacturer's JEDEC ID      ");
	for (j = 64; j <= 71; j++)
		printf("%02X ", data[j]);
	putc ('\n');
	printf("Manufacturing Location       %02X\n", data[72]);
	puts ("Manufacturer's Part Number   ");
	for (j = 73; j <= 90; j++)
		printf("%02X ", data[j]);
	putc ('\n');
	printf("Revision Code                %02X %02X\n", data[91], data[92]);
	printf("Manufacturing Date           %02X %02X\n", data[93], data[94]);
	puts ("Assembly Serial Number       ");
	for (j = 95; j <= 98; j++)
		printf("%02X ", data[j]);
	putc ('\n');
	printf("Speed rating                 PC%d\n",
		data[126] == 0x66 ? 66 : data[126]);

	return 0;
}
#endif

#if defined(CONFIG_I2C_CMD_TREE)
#if defined(CONFIG_I2C_MULTI_BUS)
int do_i2c_bus_num(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	int bus_idx, ret=0;

	if (argc == 1)
		/* querying current setting */
		printf("Current bus is %d\n", i2c_get_bus_num());
	else {
		bus_idx = simple_strtoul(argv[1], NULL, 10);
		printf("Setting bus to %d\n", bus_idx);
		ret = i2c_set_bus_num(bus_idx);
		if (ret)
			printf("Failure changing bus number (%d)\n", ret);
	}
	return ret;
}
#endif  /* CONFIG_I2C_MULTI_BUS */

int do_i2c_bus_speed(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
	int speed, ret=0;

	if (argc == 1)
		/* querying current speed */
		printf("Current bus speed=%d\n", i2c_get_bus_speed());
	else {
		speed = simple_strtoul(argv[1], NULL, 10);
		printf("Setting bus speed to %d Hz\n", speed);
		ret = i2c_set_bus_speed(speed);
		if (ret)
			printf("Failure changing bus speed (%d)\n", ret);
	}
	return ret;
}

int do_i2c(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
{
#if defined(CONFIG_I2C_MULTI_BUS)
	if (!strncmp(argv[1], "de", 2))
		return do_i2c_bus_num(cmdtp, flag, --argc, ++argv);
#endif  /* CONFIG_I2C_MULTI_BUS */
	if (!strncmp(argv[1], "sp", 2))
		return do_i2c_bus_speed(cmdtp, flag, --argc, ++argv);
	if (!strncmp(argv[1], "md", 2))
		return do_i2c_md(cmdtp, flag, --argc, ++argv);
	if (!strncmp(argv[1], "mm", 2))
		return do_i2c_mm(cmdtp, flag, --argc, ++argv);
	if (!strncmp(argv[1], "mw", 2))
		return do_i2c_mw(cmdtp, flag, --argc, ++argv);
	if (!strncmp(argv[1], "nm", 2))
		return do_i2c_nm(cmdtp, flag, --argc, ++argv);
	if (!strncmp(argv[1], "cr", 2))
		return do_i2c_crc(cmdtp, flag, --argc, ++argv);
	if (!strncmp(argv[1], "pr", 2))
		return do_i2c_probe(cmdtp, flag, --argc, ++argv);
	if (!strncmp(argv[1], "lo", 2))
		return do_i2c_loop(cmdtp, flag, --argc, ++argv);
#if defined(CONFIG_CMD_SDRAM)
	if (!strncmp(argv[1], "sd", 2))
		return do_sdram(cmdtp, flag, --argc, ++argv);
#endif
	else
		printf ("Usage:\n%s\n", cmdtp->usage);
	return 0;
}
#endif  /* CONFIG_I2C_CMD_TREE */

/***************************************************/

#if defined(CONFIG_I2C_CMD_TREE)
U_BOOT_CMD(
	i2c, 6, 1, do_i2c,
 	"i2c     - I2C sub-system\n",
#if defined(CONFIG_I2C_MULTI_BUS)
	"dev [dev] - show or set current I2C bus\n"
#endif  /* CONFIG_I2C_MULTI_BUS */
	"i2c speed [speed] - show or set I2C bus speed\n"
	"i2c md chip address[.0, .1, .2] [# of objects] - read from I2C device\n"
	"i2c mm chip address[.0, .1, .2] - write to I2C device (auto-incrementing)\n"
	"i2c mw chip address[.0, .1, .2] value [count] - write to I2C device (fill)\n"
	"i2c nm chip address[.0, .1, .2] - write to I2C device (constant address)\n"
	"i2c crc32 chip address[.0, .1, .2] count - compute CRC32 checksum\n"
	"i2c probe - show devices on the I2C bus\n"
	"i2c loop chip address[.0, .1, .2] [# of objects] - looping read of device\n"
#if defined(CONFIG_CMD_SDRAM)
	"i2c sdram chip - print SDRAM configuration information\n"
#endif
);
#endif /* CONFIG_I2C_CMD_TREE */
U_BOOT_CMD(
	imd,	4,	1,	do_i2c_md,		\
	"imd     - i2c memory display\n",				\
	"chip address[.0, .1, .2] [# of objects]\n    - i2c memory display\n" \
);

U_BOOT_CMD(
 	imm,	3,	1,	do_i2c_mm,
	"imm     - i2c memory modify (auto-incrementing)\n",
	"chip address[.0, .1, .2]\n"
	"    - memory modify, auto increment address\n"
);
U_BOOT_CMD(
	inm,	3,	1,	do_i2c_nm,
	"inm     - memory modify (constant address)\n",
	"chip address[.0, .1, .2]\n    - memory modify, read and keep address\n"
);

U_BOOT_CMD(
	imw,	5,	1,	do_i2c_mw,
	"imw     - memory write (fill)\n",
	"chip address[.0, .1, .2] value [count]\n    - memory write (fill)\n"
);

U_BOOT_CMD(
	icrc32,	5,	1,	do_i2c_crc,
	"icrc32  - checksum calculation\n",
	"chip address[.0, .1, .2] count\n    - compute CRC32 checksum\n"
);

U_BOOT_CMD(
	iprobe,	1,	1,	do_i2c_probe,
	"iprobe  - probe to discover valid I2C chip addresses\n",
	"\n    -discover valid I2C chip addresses\n"
);

/*
 * Require full name for "iloop" because it is an infinite loop!
 */
U_BOOT_CMD(
	iloop,	5,	1,	do_i2c_loop,
	"iloop   - infinite loop on address range\n",
	"chip address[.0, .1, .2] [# of objects]\n"
	"    - loop, reading a set of addresses\n"
);

#if defined(CONFIG_CMD_SDRAM)
U_BOOT_CMD(
	isdram,	2,	1,	do_sdram,
	"isdram  - print SDRAM configuration information\n",
	"chip\n    - print SDRAM configuration information\n"
	"      (valid chip values 50..57)\n"
);
#endif