/*
 * (C) Copyright 2001
 * Erik Theisen, Wave 7 Optics, etheisen@mindspring.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
 */

#if defined(VXWORKS)
# include <stdio.h>
# include <string.h>
# define CONFIG_SYS_DEF_EEPROM_ADDR 0xa0
extern char iicReadByte( char, char );
extern ulong_t crc32( unsigned char *, unsigned long );
#else
#include <common.h>
#endif

#include "vpd.h"

/*
 * vpd_reader() - reads VPD data from I2C EEPROMS.
 *                returns pointer to buffer or NULL.
 */
static unsigned char *
vpd_reader(unsigned char *buf, unsigned dev_addr, unsigned off, unsigned count)
{
    unsigned offset = off;			/* Calculated offset */

    /*
     * The main board EEPROM contains
     * SDRAM SPD in the first 128 bytes,
     * so skew the offset.
     */
    if (dev_addr == CONFIG_SYS_DEF_EEPROM_ADDR)
	offset += SDRAM_SPD_DATA_SIZE;

    /* Try to read the I2C EEPROM */
#if defined(VXWORKS)
    {
	int i;
	for( i = 0; i < count; ++i ) {
	    buf[ i ] = iicReadByte( dev_addr, offset+i );
	}
    }
#else
    if (eeprom_read(dev_addr, offset, buf, count)) {
	printf("Failed to read %d bytes from VPD EEPROM 0x%x @ 0x%x\n",
	       count, dev_addr, offset);
	return NULL;
    }
#endif

    return buf;
} /* vpd_reader() */


/*
 * vpd_get_packet() - returns next VPD packet or NULL.
 */
static vpd_packet_t *vpd_get_packet(vpd_packet_t *vpd_packet)
{
    vpd_packet_t *packet = vpd_packet;

    if (packet != NULL) {
	if (packet->identifier == VPD_PID_TERM)
	    return NULL;
	else
	    packet = (vpd_packet_t *)((char *)packet + packet->size + 2);
    }

    return packet;
} /* vpd_get_packet() */


/*
 * vpd_find_packet() - Locates and returns the specified
 *		       VPD packet or NULL on error.
 */
static vpd_packet_t *vpd_find_packet(vpd_t *vpd, unsigned char ident)
{
    vpd_packet_t *packet = (vpd_packet_t *)&vpd->packets;

    /* Guaranteed illegal */
    if (ident == VPD_PID_GI)
	return NULL;

    /* Scan tuples looking for a match */
    while ((packet->identifier != ident) &&
	   (packet->identifier != VPD_PID_TERM))
	packet = vpd_get_packet(packet);

    /* Did we find it? */
    if ((packet->identifier) && (packet->identifier != ident))
	return NULL;
    return packet;
}


/*
 * vpd_is_valid() - Validates contents of VPD data
 *		    in I2C EEPROM.  Returns 1 for
 *		    success or 0 for failure.
 */
static int vpd_is_valid(unsigned dev_addr, unsigned char *buf)
{
    unsigned	    num_bytes;
    vpd_packet_t    *packet;
    vpd_t	    *vpd = (vpd_t *)buf;
    unsigned short  stored_crc16, calc_crc16 = 0xffff;

    /* Check Eyecatcher */
    if (strncmp((char *)(vpd->header.eyecatcher), VPD_EYECATCHER, VPD_EYE_SIZE) != 0) {
	unsigned offset = 0;
	if (dev_addr == CONFIG_SYS_DEF_EEPROM_ADDR)
	    offset += SDRAM_SPD_DATA_SIZE;
	printf("Error: VPD EEPROM 0x%x corrupt @ 0x%x\n", dev_addr, offset);

	return 0;
    }

    /* Check Length */
    if (vpd->header.size> VPD_MAX_EEPROM_SIZE) {
	printf("Error: VPD EEPROM 0x%x contains bad size 0x%x\n",
	       dev_addr, vpd->header.size);
	return 0;
    }

    /* Now find the termination packet */
    if ((packet = vpd_find_packet(vpd, VPD_PID_TERM)) == NULL) {
	printf("Error: VPD EEPROM 0x%x missing termination packet\n",
	       dev_addr);
	return 0;
    }

    /* Calculate data size */
    num_bytes = (unsigned long)((unsigned char *)packet -
				(unsigned char *)vpd + sizeof(vpd_packet_t));

    /* Find stored CRC and clear it */
    if ((packet = vpd_find_packet(vpd, VPD_PID_CRC)) == NULL) {
	printf("Error: VPD EEPROM 0x%x missing CRC\n", dev_addr);
	return 0;
    }
    stored_crc16 = *((ushort *)packet->data);
    *(ushort *)packet->data = 0;

    /* OK, lets calculate the CRC and check it */
#if defined(VXWORKS)
    calc_crc16 = (0xffff & crc32(buf, num_bytes));
#else
    calc_crc16 = (0xffff & crc32(0, buf, num_bytes));
#endif
    *(ushort *)packet->data = stored_crc16;     /* Now restore the CRC */
    if (stored_crc16 != calc_crc16) {
	printf("Error: VPD EEPROM 0x%x has bad CRC 0x%x\n",
	       dev_addr, stored_crc16);
	return 0;
    }

    return 1;
} /* vpd_is_valid() */


/*
 * size_ok() - Check to see if packet size matches
 *	       size of data we want. Returns 1 for
 *	       good match or 0 for failure.
 */
static int size_ok(vpd_packet_t *packet, unsigned long size)
{
    if (packet->size != size) {
	printf("VPD Packet 0x%x corrupt.\n", packet->identifier);
	return 0;
    }
    return 1;
} /* size_ok() */


/*
 * strlen_ok() - Check to see if packet size matches
 *		 strlen of the string we want to populate.
 *		 Returns 1 for valid length or 0 for failure.
 */
static int strlen_ok(vpd_packet_t *packet, unsigned long length)
{
    if (packet->size >= length) {
	printf("VPD Packet 0x%x corrupt.\n", packet->identifier);
	return 0;
    }
    return 1;
} /* strlen_ok() */


/*
 * get_vpd_data() - populates the passed VPD structure 'vpdInfo'
 *		    with data obtained from the specified
 *		    I2C EEPROM 'dev_addr'.  Returns 0 for
 *		    success or 1 for failure.
 */
int vpd_get_data(unsigned char dev_addr, VPD *vpdInfo)
{
    unsigned char buf[VPD_EEPROM_SIZE];
    vpd_t *vpd = (vpd_t *)buf;
    vpd_packet_t *packet;

    if (vpdInfo == NULL)
	return 1;

     /*
      * Fill vpdInfo with 0s to blank out
      * unused fields, fill vpdInfo->ethAddrs
      * with all 0xffs so that other's code can
      * determine how many real Ethernet addresses
      * there are.  OUIs starting with 0xff are
      * broadcast addresses, and would never be
      * permantely stored.
      */
    memset((void *)vpdInfo, 0, sizeof(VPD));
    memset((void *)&vpdInfo->ethAddrs, 0xff, sizeof(vpdInfo->ethAddrs));
    vpdInfo->_devAddr = dev_addr;

    /* Read the minimum size first */
    if (vpd_reader(buf, dev_addr, 0, VPD_EEPROM_SIZE) == NULL) {
	return 1;
    }

    /* Check validity of VPD data */
    if (!vpd_is_valid(dev_addr, buf)) {
	printf("VPD Data is INVALID!\n");
	return 1;
    }

    /*
      * Walk all the packets and populate
      * the VPD info structure.
      */
    packet = (vpd_packet_t *)&vpd->packets;
    do {
	switch (packet->identifier) {
	    case VPD_PID_GI:
		printf("Error: Illegal VPD value\n");
		break;
	    case VPD_PID_PID:
		if (strlen_ok(packet, MAX_PROD_ID)) {
		    strncpy(vpdInfo->productId,
			    (char *)(packet->data), packet->size);
		}
		break;
	    case VPD_PID_REV:
		if (size_ok(packet, sizeof(char)))
		    vpdInfo->revisionId = *packet->data;
		break;
	    case VPD_PID_SN:
		if (size_ok(packet, sizeof(unsigned long))) {
		    vpdInfo->serialNum =
			*(unsigned long *)packet->data;
		}
		break;
	    case VPD_PID_MANID:
		if (size_ok(packet, sizeof(unsigned char)))
		    vpdInfo->manuID = *packet->data;
		break;
	    case VPD_PID_PCO:
		if (size_ok(packet, sizeof(unsigned long))) {
		    vpdInfo->configOpt =
			*(unsigned long *)packet->data;
		}
		break;
	    case VPD_PID_SYSCLK:
		if (size_ok(packet, sizeof(unsigned long)))
		    vpdInfo->sysClk = *(unsigned long *)packet->data;
		break;
	    case VPD_PID_SERCLK:
		if (size_ok(packet, sizeof(unsigned long)))
		    vpdInfo->serClk = *(unsigned long *)packet->data;
		break;
	    case VPD_PID_FLASH:
		if (size_ok(packet, 9)) {	/* XXX - hardcoded,
						   padding in struct */
		    memcpy(&vpdInfo->flashCfg, packet->data, 9);
		}
		break;
	    case VPD_PID_ETHADDR:
		memcpy(vpdInfo->ethAddrs, packet->data, packet->size);
		break;
	    case VPD_PID_POTS:
		if (size_ok(packet, sizeof(char)))
		    vpdInfo->numPOTS = (unsigned)*packet->data;
		break;
	    case VPD_PID_DS1:
		if (size_ok(packet, sizeof(char)))
		    vpdInfo->numDS1 = (unsigned)*packet->data;
	    case VPD_PID_GAL:
	    case VPD_PID_CRC:
	    case VPD_PID_TERM:
		break;
	    default:
		printf("Warning: Found unknown VPD packet ID 0x%x\n",
		       packet->identifier);
		break;
	}
    } while ((packet = vpd_get_packet(packet)));

    return 0;
} /* end get_vpd_data() */


/*
 * vpd_init() - Initialize default VPD environment
 */
int vpd_init(unsigned char dev_addr)
{
    return (0);
} /* vpd_init() */


/*
 * vpd_print() - Pretty print the VPD data.
 */
void vpd_print(VPD *vpdInfo)
{
    const char *const sp    = "";
    const char *const sfmt  = "%4s%-20s: \"%s\"\n";
    const char *const cfmt  = "%4s%-20s: '%c'\n";
    const char *const dfmt  = "%4s%-20s: %ld\n";
    const char *const hfmt  = "%4s%-20s: %08lX\n";
    const char *const dsfmt = "%4s%-20s: %d\n";
    const char *const hsfmt = "%4s%-20s: %04X\n";
    const char *const dhfmt = "%4s%-20s: %ld (%lX)\n";

    printf("VPD read from I2C device: %02X\n", vpdInfo->_devAddr);

    if (vpdInfo->productId[0])
	printf(sfmt, sp, "Product ID", vpdInfo->productId);
    else
	printf(sfmt, sp, "Product ID", "UNKNOWN");

    if (vpdInfo->revisionId)
	printf(cfmt, sp, "Revision ID", vpdInfo->revisionId);

    if (vpdInfo->serialNum)
	printf(dfmt, sp, "Serial Number", vpdInfo->serialNum);

    if (vpdInfo->manuID)
	printf(dfmt, sp, "Manufacture ID", (long)vpdInfo->manuID);

    if (vpdInfo->configOpt)
	printf(hfmt, sp, "Configuration", vpdInfo->configOpt);

    if (vpdInfo->sysClk)
	printf(dhfmt, sp, "System Clock", vpdInfo->sysClk, vpdInfo->sysClk);

    if (vpdInfo->serClk)
	printf(dhfmt, sp, "Serial Clock", vpdInfo->serClk, vpdInfo->serClk);

    if (vpdInfo->numPOTS)
	printf(dfmt, sp, "Number of POTS lines", vpdInfo->numPOTS);

    if (vpdInfo->numDS1)
	printf(dfmt, sp, "Number of DS1s", vpdInfo->numDS1);

    /* Print Ethernet Addresses */
    if (vpdInfo->ethAddrs[0][0] != 0xff) {
	int i, j;
	printf("%4sEtherNet Address(es): ", sp);
	for (i = 0; i < MAX_ETH_ADDRS; i++) {
	    if (vpdInfo->ethAddrs[i][0] != 0xff) {
		for (j = 0; j < 6; j++) {
		    printf("%02X", vpdInfo->ethAddrs[i][j]);
		    if (((j + 1) % 6) != 0)
			printf(":");
		    else
			printf(" ");
		}
		if (((i + 1) % 3) == 0) printf("\n%24s: ", sp);
	    }
	}
	printf("\n");
    }

    if (vpdInfo->flashCfg.mfg && vpdInfo->flashCfg.dev) {
	printf("Main Flash Configuration:\n");
	printf(hsfmt, sp, "Manufacture ID", vpdInfo->flashCfg.mfg);
	printf(hsfmt, sp, "Device ID",      vpdInfo->flashCfg.dev);
	printf(dsfmt, sp, "Device Width",   vpdInfo->flashCfg.devWidth);
	printf(dsfmt, sp, "Num. Devices",   vpdInfo->flashCfg.numDevs);
	printf(dsfmt, sp, "Num. Columns",   vpdInfo->flashCfg.numCols);
	printf(dsfmt, sp, "Column Width",   vpdInfo->flashCfg.colWidth);
	printf(dsfmt, sp, "WE Data Width",  vpdInfo->flashCfg.weDataWidth);
    }
} /* vpd_print() */