Add support for multiple I2C buses

[people/ms/u-boot.git] / common / cmd_i2c.c

/*
 * (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:
 *
 * Two of the commands (imm and imw) take a byte/word/long modifier
 * (e.g. imm.w specifies the word-length modifier).  This was done to
 * allow manipulating word-length registers.  It was not done on any other
 * commands because it was not deemed useful.
 *
 * {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
 *   CFG_I2C_EEPROM_ADDR_OVERFLOW and using the .1 modifier on the
 *   {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...
 *     imd 50 0 10      display 16 bytes starting at 0x000
 *                      On the bus: <S> A0 00 <E> <S> A1 <rd> ... <rd>
 *     imd 50 100 10    display 16 bytes starting at 0x100
 *                      On the bus: <S> A2 00 <E> <S> A3 <rd> ... <rd>
 *     imd 50 210 10    display 16 bytes starting at 0x210
 *                      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 <i2c.h>
#include <asm/byteorder.h>

#if (CONFIG_COMMANDS & CFG_CMD_I2C)


/* 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(CFG_I2C_NOPROBES)
#if defined(CONFIG_I2C_MULTI_BUS)
static struct
{
        uchar   bus;
        uchar   addr;
} i2c_no_probes[] = CFG_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[] = CFG_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]))
#endif

static int
mod_i2c_mem(cmd_tbl_t *cmdtp, int incrflag, int flag, int argc, char *argv[]);
extern int cmd_get_data_size(char* arg, int default_size);

/*
 * Syntax:
 *      imd {i2c_chip} {addr}{.0, .1, .2} {len}
 */
#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) {
                printf ("Usage:\n%s\n", cmdtp->usage);
                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++) {
                        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;
                        }
                }

                /*
                 * 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");
                } else {
                        printf("%04x:", addr);
                        cp = linebuf;
                        for (j=0; j<linebytes; j++) {
                                printf(" %02x", *cp++);
                                addr++;
                        }
                        puts ("    ");
                        cp = linebuf;
                        for (j=0; j<linebytes; j++) {
                                if ((*cp < 0x20) || (*cp > 0x7e))
                                        puts (".");
                                else
                                        printf("%c", *cp);
                                cp++;
                        }
                        putc ('\n');
                }
                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;
}

int do_i2c_mm ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
        return mod_i2c_mem (cmdtp, 1, flag, argc, argv);
}


int do_i2c_nm ( cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
        return mod_i2c_mem (cmdtp, 0, flag, argc, argv);
}

/* Write (fill) memory
 *
 * Syntax:
 *      imw {i2c_chip} {addr}{.0, .1, .2} {data} [{count}]
 */
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)) {
                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;
                }
        }

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

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

        while (count-- > 0) {
                if(i2c_write(chip, addr++, alen, &byte, 1) != 0) {
                        puts ("Error writing the chip.\n");
                }
                /*
                 * 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.
                 */
/*
 * No write delay with FRAM devices.
 */
#if !defined(CFG_I2C_FRAM)
                udelay(11000);
#endif

#if 0
                for(timeout = 0; timeout < 10; timeout++) {
                        udelay(2000);
                        if(i2c_probe(chip) == 0)
                                break;
                }
#endif
        }

        return (0);
}


/* Calculate a CRC on memory
 *
 * Syntax:
 *      icrc32 {i2c_chip} {addr}{.0, .1, .2} {count}
 */
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) {
                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;
                }
        }

        /*
         * 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) {
                        err++;
                }
                crc = crc32 (crc, &byte, 1);
                addr++;
        }
        if(err > 0)
        {
                puts ("Error reading the chip,\n");
        } else {
                printf ("%08lx\n", crc);
        }

        return 0;
}


/* Modify memory.
 *
 * Syntax:
 *      imm{.b, .w, .l} {i2c_chip} {addr}{.0, .1, .2}
 *      inm{.b, .w, .l} {i2c_chip} {addr}{.0, .1, .2}
 */

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) {
                printf ("Usage:\n%s\n", cmdtp->usage);
                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);

                /*
                 * 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;
                        }
                }
        }

        /*
         * 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");
                } else {
                        data = cpu_to_be32(data);
                        if(size == 1) {
                                printf(" %02lx", (data >> 24) & 0x000000FF);
                        } else if(size == 2) {
                                printf(" %04lx", (data >> 16) & 0x0000FFFF);
                        } else {
                                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) {
                        break;  /* timed out, exit the command  */
                }
#endif
                else {
                        char *endp;

                        data = simple_strtoul(console_buffer, &endp, 16);
                        if(size == 1) {
                                data = data << 24;
                        } else if(size == 2) {
                                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 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 (CONFIG_COMMANDS & CFG_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;
                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;
                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  /* CFG_CMD_SDRAM */

#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 (CONFIG_COMMANDS & CFG_CMD_SDRAM)
        if(!strncmp(argv[1], "sd", 2))
        {
                return do_sdram(cmdtp, flag, --argc, ++argv);
        }
#endif  /* CFG_CMD_SDRAM */
        else
        {
                printf ("Usage:\n%s\n", cmdtp->usage);
        }
        return 0;
}
#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 (CONFIG_COMMANDS & CFG_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

#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 (CONFIG_COMMANDS & CFG_CMD_SDRAM)
        "i2c sdram chip - print SDRAM configuration information\n"
#endif  /* CFG_CMD_SDRAM */
);
#endif  /* CONFIG_I2C_CMD_TREE */

#endif  /* CFG_CMD_I2C */