/*
 * (C) Copyright 2005
 * Ladislav Michl, 2N Telekomunikace, michl@2n.cz
 *
 * 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 version 2 as
 * published by the Free Software Foundation.
 *
 * 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
 *
 * Some code shamelessly stolen back from Robin Getz.
 */

#include <common.h>
#include <exports.h>
#include <timestamp.h>
#include <net.h>
#include "../drivers/net/smc91111.h"

static struct eth_device dev = {
        .iobase = CONFIG_SMC91111_BASE
};

static u16 read_eeprom_reg(u16 reg)
{
        int timeout;

        SMC_SELECT_BANK(&dev, 2);
        SMC_outw(&dev, reg, PTR_REG);

        SMC_SELECT_BANK(&dev, 1);
        SMC_outw(&dev, SMC_inw(&dev, CTL_REG) | CTL_EEPROM_SELECT |
                CTL_RELOAD, CTL_REG);

        timeout = 100;

        while ((SMC_inw(&dev, CTL_REG) & CTL_RELOAD) && --timeout)
                udelay(100);
        if (timeout == 0) {
                printf("Timeout reading register %02x\n", reg);
                return 0;
        }

        return SMC_inw(&dev, GP_REG);
}

static int write_eeprom_reg(u16 value, u16 reg)
{
        int timeout;

        SMC_SELECT_BANK(&dev, 2);
        SMC_outw(&dev, reg, PTR_REG);

        SMC_SELECT_BANK(&dev, 1);

        SMC_outw(&dev, value, GP_REG);
        SMC_outw(&dev, SMC_inw(&dev, CTL_REG) | CTL_EEPROM_SELECT |
                CTL_STORE, CTL_REG);

        timeout = 100;

        while ((SMC_inw(&dev, CTL_REG) & CTL_STORE) && --timeout)
                udelay(100);
        if (timeout == 0) {
                printf("Timeout writing register %02x\n", reg);
                return 0;
        }

        return 1;
}

static int write_data(u16 *buf, int len)
{
        u16 reg = 0x23;

        while (len--)
                write_eeprom_reg(*buf++, reg++);

        return 0;
}

static int verify_macaddr(char *s)
{
        u16 reg;
        int i, err = 0;

        puts("HWaddr: ");
        for (i = 0; i < 3; i++) {
                reg = read_eeprom_reg(0x20 + i);
                printf("%02x:%02x%c", reg & 0xff, reg >> 8, i != 2 ? ':' : '\n');
                if (s)
                        err |= reg != ((u16 *)s)[i];
        }

        return err ? 0 : 1;
}

static int set_mac(char *s)
{
        int i;
        char *e, eaddr[6];

        /* turn string into mac value */
        for (i = 0; i < 6; i++) {
                eaddr[i] = simple_strtoul(s, &e, 16);
                s = (*e) ? e+1 : e;
        }

        for (i = 0; i < 3; i++)
                write_eeprom_reg(*(((u16 *)eaddr) + i), 0x20 + i);

        return 0;
}

static int parse_element(char *s, unsigned char *buf, int len)
{
        int cnt;
        char *p, num[3];
        unsigned char id;

        id = simple_strtoul(s, &p, 16);
        if (*p++ != ':')
                return -1;
        cnt = 2;
        num[2] = 0;
        for (; *p; p += 2) {
                if (p[1] == 0)
                        return -2;
                if (cnt + 3 > len)
                        return -3;
                num[0] = p[0];
                num[1] = p[1];
                buf[cnt++] = simple_strtoul(num, NULL, 16);
        }
        buf[0] = id;
        buf[1] = cnt - 2;

        return cnt;
}

int eeprom(int argc, char * const argv[])
{
        int i, len, ret;
        unsigned char buf[58], *p;

        app_startup(argv);
        i = get_version();
        if (i != XF_VERSION) {
                printf("Using ABI version %d, but U-Boot provides %d\n",
                        XF_VERSION, i);
                return 1;
        }

        if ((SMC_inw(&dev, BANK_SELECT) & 0xFF00) != 0x3300) {
                puts("SMSC91111 not found\n");
                return 2;
        }

        /* Called without parameters - print MAC address */
        if (argc < 2) {
                verify_macaddr(NULL);
                return 0;
        }

        /* Print help message */
        if (argv[1][1] == 'h') {
                puts("VoiceBlue EEPROM writer\n"
                        "Built: " U_BOOT_DATE " at " U_BOOT_TIME "\n"
                        "Usage:\n\t<mac_address> [<element_1>] [<...>]\n");
                return 0;
        }

        /* Try to parse information elements */
        len = sizeof(buf);
        p = buf;
        for (i = 2; i < argc; i++) {
                ret = parse_element(argv[i], p, len);
                switch (ret) {
                case -1:
                        printf("Element %d: malformed\n", i - 1);
                        return 3;
                case -2:
                        printf("Element %d: odd character count\n", i - 1);
                        return 3;
                case -3:
                        puts("Out of EEPROM memory\n");
                        return 3;
                default:
                        p += ret;
                        len -= ret;
                }
        }

        /* First argument (MAC) is mandatory */
        set_mac(argv[1]);
        if (verify_macaddr(argv[1])) {
                puts("*** HWaddr does not match! ***\n");
                return 4;
        }

        while (len--)
                *p++ = 0;

        write_data((u16 *)buf, sizeof(buf) >> 1);

        return 0;
}