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/*
 * (C) Copyright 2001
 * Gerald Van Baren, Custom IDEAS, vanbaren@cideas.com.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 */

/*
 * I2C Functions similar to the standard memory functions.
 *
 * There are several parameters in many of the commands that bear further
 * explanations:
 *
 * {i2c_chip} is the I2C chip address (the first byte sent on the bus).
 *   Each I2C chip on the bus has a unique address.  On the I2C data bus,
 *   the address is the upper seven bits and the LSB is the "read/write"
 *   bit.  Note that the {i2c_chip} address specified on the command
 *   line is not shifted up: e.g. a typical EEPROM memory chip may have
 *   an I2C address of 0x50, but the data put on the bus will be 0xA0
 *   for write and 0xA1 for read.  This "non shifted" address notation
 *   matches at least half of the data sheets :-/.
 *
 * {addr} is the address (or offset) within the chip.  Small memory
 *   chips have 8 bit addresses.  Large memory chips have 16 bit
 *   addresses.  Other memory chips have 9, 10, or 11 bit addresses.
 *   Many non-memory chips have multiple registers and {addr} is used
 *   as the register index.  Some non-memory chips have only one register
 *   and therefore don't need any {addr} parameter.
 *
 *   The default {addr} parameter is one byte (.1) which works well for
 *   memories and registers with 8 bits of address space.
 *
 *   You can specify the length of the {addr} field with the optional .0,
 *   .1, or .2 modifier (similar to the .b, .w, .l modifier).  If you are
 *   manipulating a single register device which doesn't use an address
 *   field, use "0.0" for the address and the ".0" length field will
 *   suppress the address in the I2C data stream.  This also works for
 *   successive reads using the I2C auto-incrementing memory pointer.
 *
 *   If you are manipulating a large memory with 2-byte addresses, use
 *   the .2 address modifier, e.g. 210.2 addresses location 528 (decimal).
 *
 *   Then there are the unfortunate memory chips that spill the most
 *   significant 1, 2, or 3 bits of address into the chip address byte.
 *   This effectively makes one chip (logically) look like 2, 4, or
 *   8 chips.  This is handled (awkwardly) by #defining
 *   CONFIG_SYS_I2C_EEPROM_ADDR_OVERFLOW and using the .1 modifier on the
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 *   {addr} field (since .1 is the default, it doesn't actually have to
 *   be specified).  Examples: given a memory chip at I2C chip address
 *   0x50, the following would happen...
 *     i2c md 50 0 10   display 16 bytes starting at 0x000
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 *                      On the bus: <S> A0 00 <E> <S> A1 <rd> ... <rd>
 *     i2c md 50 100 10 display 16 bytes starting at 0x100
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 *                      On the bus: <S> A2 00 <E> <S> A3 <rd> ... <rd>
 *     i2c md 50 210 10 display 16 bytes starting at 0x210
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 *                      On the bus: <S> A4 10 <E> <S> A5 <rd> ... <rd>
 *   This is awfully ugly.  It would be nice if someone would think up
 *   a better way of handling this.
 *
 * Adapted from cmd_mem.c which is copyright Wolfgang Denk (wd@denx.de).
 */

#include <common.h>
#include <command.h>
#include <environment.h>
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#include <i2c.h>
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#include <asm/byteorder.h>

/* Display values from last command.
 * Memory modify remembered values are different from display memory.
 */
static uchar	i2c_dp_last_chip;
static uint	i2c_dp_last_addr;
static uint	i2c_dp_last_alen;
static uint	i2c_dp_last_length = 0x10;

static uchar	i2c_mm_last_chip;
static uint	i2c_mm_last_addr;
static uint	i2c_mm_last_alen;

/* If only one I2C bus is present, the list of devices to ignore when
 * the probe command is issued is represented by a 1D array of addresses.
 * When multiple buses are present, the list is an array of bus-address
 * pairs.  The following macros take care of this */

#if defined(CONFIG_SYS_I2C_NOPROBES)
#if defined(CONFIG_I2C_MULTI_BUS)
static struct
{
	uchar	bus;
	uchar	addr;
} i2c_no_probes[] = CONFIG_SYS_I2C_NOPROBES;
#define GET_BUS_NUM	i2c_get_bus_num()
#define COMPARE_BUS(b,i)	(i2c_no_probes[(i)].bus == (b))
#define COMPARE_ADDR(a,i)	(i2c_no_probes[(i)].addr == (a))
#define NO_PROBE_ADDR(i)	i2c_no_probes[(i)].addr
#else		/* single bus */
static uchar i2c_no_probes[] = CONFIG_SYS_I2C_NOPROBES;
#define GET_BUS_NUM	0
#define COMPARE_BUS(b,i)	((b) == 0)	/* Make compiler happy */
#define COMPARE_ADDR(a,i)	(i2c_no_probes[(i)] == (a))
#define NO_PROBE_ADDR(i)	i2c_no_probes[(i)]
#endif	/* CONFIG_MULTI_BUS */

#define NUM_ELEMENTS_NOPROBE (sizeof(i2c_no_probes)/sizeof(i2c_no_probes[0]))
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#endif

#if defined(CONFIG_I2C_MUX)
static I2C_MUX_DEVICE	*i2c_mux_devices = NULL;
static	int	i2c_mux_busid = CONFIG_SYS_MAX_I2C_BUS;
/* TODO: Implement architecture-specific get/set functions */
unsigned int __def_i2c_get_bus_speed(void)
{
	return CONFIG_SYS_I2C_SPEED;
}
unsigned int i2c_get_bus_speed(void)
	__attribute__((weak, alias("__def_i2c_get_bus_speed")));

int __def_i2c_set_bus_speed(unsigned int speed)
{
	if (speed != CONFIG_SYS_I2C_SPEED)
		return -1;

	return 0;
}
int i2c_set_bus_speed(unsigned int)
	__attribute__((weak, alias("__def_i2c_set_bus_speed")));

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/*
 * Syntax:
 *	i2c md {i2c_chip} {addr}{.0, .1, .2} {len}
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 */
#define DISP_LINE_LEN	16

int do_i2c_md ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	u_char	chip;
	uint	addr, alen, length;
	int	j, nbytes, linebytes;

	/* We use the last specified parameters, unless new ones are
	 * entered.
	 */
	chip   = i2c_dp_last_chip;
	addr   = i2c_dp_last_addr;
	alen   = i2c_dp_last_alen;
	length = i2c_dp_last_length;

	if (argc < 3) {
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		return 1;
	}

	if ((flag & CMD_FLAG_REPEAT) == 0) {
		/*
		 * New command specified.
		 */
		alen = 1;

		/*
		 * I2C chip address
		 */
		chip = simple_strtoul(argv[1], NULL, 16);

		/*
		 * I2C data address within the chip.  This can be 1 or
		 * 2 bytes long.  Some day it might be 3 bytes long :-).
		 */
		addr = simple_strtoul(argv[2], NULL, 16);
		alen = 1;
		for (j = 0; j < 8; j++) {
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			if (argv[2][j] == '.') {
				alen = argv[2][j+1] - '0';
				if (alen > 4) {
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					return 1;
				}
				break;
			} else if (argv[2][j] == '\0')
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				break;
		}

		/*
		 * If another parameter, it is the length to display.
		 * Length is the number of objects, not number of bytes.
		 */
		if (argc > 3)
			length = simple_strtoul(argv[3], NULL, 16);
	}

	/*
	 * Print the lines.
	 *
	 * We buffer all read data, so we can make sure data is read only
	 * once.
	 */
	nbytes = length;
	do {
		unsigned char	linebuf[DISP_LINE_LEN];
		unsigned char	*cp;

		linebytes = (nbytes > DISP_LINE_LEN) ? DISP_LINE_LEN : nbytes;

		if (i2c_read(chip, addr, alen, linebuf, linebytes) != 0)
			puts ("Error reading the chip.\n");
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			printf("%04x:", addr);
			cp = linebuf;
			for (j=0; j<linebytes; j++) {
				printf(" %02x", *cp++);
				addr++;
			}
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			cp = linebuf;
			for (j=0; j<linebytes; j++) {
				if ((*cp < 0x20) || (*cp > 0x7e))
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				else
					printf("%c", *cp);
				cp++;
			}
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		}
		nbytes -= linebytes;
	} while (nbytes > 0);

	i2c_dp_last_chip   = chip;
	i2c_dp_last_addr   = addr;
	i2c_dp_last_alen   = alen;
	i2c_dp_last_length = length;

	return 0;
}


/* Write (fill) memory
 *
 * Syntax:
 *	i2c mw {i2c_chip} {addr}{.0, .1, .2} {data} [{count}]
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 */
int do_i2c_mw ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	uchar	chip;
	ulong	addr;
	uint	alen;
	uchar	byte;
	int	count;
	int	j;

	if ((argc < 4) || (argc > 5)) {
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		return 1;
	}

	/*
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	 * Chip is always specified.
	 */
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	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++) {
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		if (argv[2][j] == '.') {
			alen = argv[2][j+1] - '0';
			if (alen > 4) {
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				return 1;
			}
			break;
		} else if (argv[2][j] == '\0')
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			break;
	}

	/*
	 * Value to write is always specified.
	 */
	byte = simple_strtoul(argv[3], NULL, 16);

	/*
	 * Optional count
	 */
	if (argc == 5)
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		count = simple_strtoul(argv[4], NULL, 16);
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		count = 1;

	while (count-- > 0) {
		if (i2c_write(chip, addr++, alen, &byte, 1) != 0)
			puts ("Error writing the chip.\n");
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		/*
		 * Wait for the write to complete.  The write can take
		 * up to 10mSec (we allow a little more time).
		 *
		 * On some chips, while the write is in progress, the
		 * chip doesn't respond.  This apparently isn't a
		 * universal feature so we don't take advantage of it.
		 */
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/*
 * No write delay with FRAM devices.
 */
#if !defined(CONFIG_SYS_I2C_FRAM)
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		udelay(11000);
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#endif
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	}

	return (0);
}

/* Calculate a CRC on memory
 *
 * Syntax:
 *	i2c crc32 {i2c_chip} {addr}{.0, .1, .2} {count}
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 */
int do_i2c_crc (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
	uchar	chip;
	ulong	addr;
	uint	alen;
	int	count;
	uchar	byte;
	ulong	crc;
	ulong	err;
	int	j;

	if (argc < 4) {
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		return 1;
	}

	/*
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	 * Chip is always specified.
	 */
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	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++) {
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		if (argv[2][j] == '.') {
			alen = argv[2][j+1] - '0';
			if (alen > 4) {
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				return 1;
			}
			break;
		} else if (argv[2][j] == '\0')
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			break;
	}

	/*
	 * Count is always specified
	 */
	count = simple_strtoul(argv[3], NULL, 16);

	printf ("CRC32 for %08lx ... %08lx ==> ", addr, addr + count - 1);
	/*
	 * CRC a byte at a time.  This is going to be slooow, but hey, the
	 * memories are small and slow too so hopefully nobody notices.
	 */
	crc = 0;
	err = 0;
	while (count-- > 0) {
		if (i2c_read(chip, addr, alen, &byte, 1) != 0)
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			err++;
		crc = crc32 (crc, &byte, 1);
		addr++;
	}
	if (err > 0)
		puts ("Error reading the chip,\n");
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		printf ("%08lx\n", crc);

	return 0;
}

/* Modify memory.
 *
 * Syntax:
 *	i2c mm{.b, .w, .l} {i2c_chip} {addr}{.0, .1, .2}
 *	i2c nm{.b, .w, .l} {i2c_chip} {addr}{.0, .1, .2}
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 */

static int
mod_i2c_mem(cmd_tbl_t *cmdtp, int incrflag, int flag, int argc, char *argv[])
{
	uchar	chip;
	ulong	addr;
	uint	alen;
	ulong	data;
	int	size = 1;
	int	nbytes;
	int	j;
	extern char console_buffer[];

	if (argc != 3) {
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		return 1;
	}

#ifdef CONFIG_BOOT_RETRY_TIME
	reset_cmd_timeout();	/* got a good command to get here */
#endif
	/*
	 * We use the last specified parameters, unless new ones are
	 * entered.
	 */
	chip = i2c_mm_last_chip;
	addr = i2c_mm_last_addr;
	alen = i2c_mm_last_alen;

	if ((flag & CMD_FLAG_REPEAT) == 0) {
		/*
		 * New command specified.  Check for a size specification.
		 * Defaults to byte if no or incorrect specification.
		 */
		size = cmd_get_data_size(argv[0], 1);

		/*
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		 * Chip is always specified.
		 */
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		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++) {
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			if (argv[2][j] == '.') {
				alen = argv[2][j+1] - '0';
				if (alen > 4) {
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					return 1;
				}
				break;
			} else if (argv[2][j] == '\0')
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				break;
		}
	}

	/*
	 * Print the address, followed by value.  Then accept input for
	 * the next value.  A non-converted value exits.
	 */
	do {
		printf("%08lx:", addr);
		if (i2c_read(chip, addr, alen, (uchar *)&data, size) != 0)
			puts ("\nError reading the chip,\n");
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			data = cpu_to_be32(data);
			if (size == 1)
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				printf(" %02lx", (data >> 24) & 0x000000FF);
			else if (size == 2)
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				printf(" %04lx", (data >> 16) & 0x0000FFFF);
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				printf(" %08lx", data);
		}

		nbytes = readline (" ? ");
		if (nbytes == 0) {
			/*
			 * <CR> pressed as only input, don't modify current
			 * location and move to next.
			 */
			if (incrflag)
				addr += size;
			nbytes = size;
#ifdef CONFIG_BOOT_RETRY_TIME
			reset_cmd_timeout(); /* good enough to not time out */
#endif
		}
#ifdef CONFIG_BOOT_RETRY_TIME
		else if (nbytes == -2)
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			break;	/* timed out, exit the command	*/
#endif
		else {
			char *endp;

			data = simple_strtoul(console_buffer, &endp, 16);
			if (size == 1)
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				data = data << 24;
			else if (size == 2)
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				data = data << 16;
			data = be32_to_cpu(data);
			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 CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS
				udelay(CONFIG_SYS_EEPROM_PAGE_WRITE_DELAY_MS * 1000);
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				if (incrflag)
					addr += size;
			}
		}
	} while (nbytes);

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