/*
 * (C) Copyright 2008
 * Heiko Schocher, DENX Software Engineering, hs@denx.de.
 *
 * (C) Copyright 2011
 * Holger Brunck, Keymile GmbH Hannover, holger.brunck@keymile.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
 */

#include <common.h>
#include <ioports.h>
#include <command.h>
#include <malloc.h>
#include <hush.h>
#include <net.h>
#include <netdev.h>
#include <asm/io.h>
#include <linux/ctype.h>

#include "common.h"
#if defined(CONFIG_HARD_I2C) || defined(CONFIG_SOFT_I2C)
#include <i2c.h>
#endif

#if !defined(CONFIG_MPC83xx)
static void i2c_write_start_seq(void);
#endif

DECLARE_GLOBAL_DATA_PTR;

/*
 * Set Keymile specific environment variables
 * Currently only some memory layout variables are calculated here
 * ... ------------------------------------------------
 * ... |@rootfsaddr |@pnvramaddr |@varaddr |@reserved |@END_OF_RAM
 * ... |<------------------- pram ------------------->|
 * ... ------------------------------------------------
 * @END_OF_RAM: denotes the RAM size
 * @pnvramaddr: Startadress of pseudo non volatile RAM in hex
 * @pram      : preserved ram size in k
 * @varaddr   : startadress for /var mounted into RAM
 */
int set_km_env(void)
{
        uchar buf[32];
        unsigned int pnvramaddr;
        unsigned int pram;
        unsigned int varaddr;
        unsigned int kernelmem;
        char *p;
        unsigned long rootfssize = 0;

        pnvramaddr = gd->ram_size - CONFIG_KM_RESERVED_PRAM - CONFIG_KM_PHRAM
                        - CONFIG_KM_PNVRAM;
        sprintf((char *)buf, "0x%x", pnvramaddr);
        setenv("pnvramaddr", (char *)buf);

        /* try to read rootfssize (ram image) from envrionment */
        p = getenv("rootfssize");
        if (p != NULL)
                strict_strtoul(p, 16, &rootfssize);
        pram = (rootfssize + CONFIG_KM_RESERVED_PRAM + CONFIG_KM_PHRAM +
                CONFIG_KM_PNVRAM) / 0x400;
        sprintf((char *)buf, "0x%x", pram);
        setenv("pram", (char *)buf);

        varaddr = gd->ram_size - CONFIG_KM_RESERVED_PRAM - CONFIG_KM_PHRAM;
        sprintf((char *)buf, "0x%x", varaddr);
        setenv("varaddr", (char *)buf);

        kernelmem = gd->ram_size - 0x400 * pram;
        sprintf((char *)buf, "0x%x", kernelmem);
        setenv("kernelmem", (char *)buf);

        return 0;
}

#if defined(CONFIG_SYS_I2C_INIT_BOARD)
#if !defined(CONFIG_MPC83xx)
static void i2c_write_start_seq(void)
{
        set_sda(1);
        udelay(DELAY_HALF_PERIOD);
        set_scl(1);
        udelay(DELAY_HALF_PERIOD);
        set_sda(0);
        udelay(DELAY_HALF_PERIOD);
        set_scl(0);
        udelay(DELAY_HALF_PERIOD);
}

/*
 * I2C is a synchronous protocol and resets of the processor in the middle
 * of an access can block the I2C Bus until a powerdown of the full unit is
 * done. This function toggles the SCL until the SCL and SCA line are
 * released, but max. 16 times, after this a I2C start-sequence is sent.
 * This I2C Deblocking mechanism was developed by Keymile in association
 * with Anatech and Atmel in 1998.
 */
int i2c_make_abort(void)
{

#if defined(CONFIG_HARD_I2C) && !defined(MACH_TYPE_KM_KIRKWOOD)
        immap_t *immap = (immap_t *)CONFIG_SYS_IMMR ;
        i2c8260_t *i2c  = (i2c8260_t *)&immap->im_i2c;

        /*
         * disable I2C controller first, otherwhise it thinks we want to
         * talk to the slave port...
         */
        clrbits_8(&i2c->i2c_i2mod, 0x01);

        /* Set the PortPins to GPIO */
        setports(1);
#endif

        int     scl_state = 0;
        int     sda_state = 0;
        int     i = 0;
        int     ret = 0;

        if (!get_sda()) {
                ret = -1;
                while (i < 16) {
                        i++;
                        set_scl(0);
                        udelay(DELAY_ABORT_SEQ);
                        set_scl(1);
                        udelay(DELAY_ABORT_SEQ);
                        scl_state = get_scl();
                        sda_state = get_sda();
                        if (scl_state && sda_state) {
                                ret = 0;
                                printf("[INFO] i2c abort after %d clocks\n", i);
                                break;
                        }
                }
        }
        if (ret == 0)
                for (i = 0; i < 5; i++)
                        i2c_write_start_seq();
        else
                printf("[ERROR] i2c abort failed\n");

        /* respect stop setup time */
        udelay(DELAY_ABORT_SEQ);
        set_scl(1);
        udelay(DELAY_ABORT_SEQ);
        set_sda(1);
        get_sda();

#if defined(CONFIG_HARD_I2C)
        /* Set the PortPins back to use for I2C */
        setports(0);
#endif
        return ret;
}
#endif

/**
 * i2c_init_board - reset i2c bus. When the board is powercycled during a
 * bus transfer it might hang; for details see doc/I2C_Edge_Conditions.
 */
void i2c_init_board(void)
{
        /* Now run the AbortSequence() */
        i2c_make_abort();
}
#endif


#if !defined(MACH_TYPE_KM_KIRKWOOD)
int ethernet_present(void)
{
        struct km_bec_fpga *base =
                (struct km_bec_fpga *)CONFIG_SYS_KMBEC_FPGA_BASE;

        return in_8(&base->bprth) & PIGGY_PRESENT;
}
#endif

int board_eth_init(bd_t *bis)
{
        if (ethernet_present())
                return cpu_eth_init(bis);

        return -1;
}

/*
 * do_setboardid command
 * read out the board id and the hw key from the intventory EEPROM and set
 * this values as environment variables.
 */
static int do_setboardid(cmd_tbl_t *cmdtp, int flag, int argc,
                                char *const argv[])
{
        unsigned char buf[32];
        char *p;

        p = get_local_var("IVM_BoardId");
        if (p == NULL) {
                printf("can't get the IVM_Boardid\n");
                return 1;
        }
        sprintf((char *)buf, "%s", p);
        setenv("boardid", (char *)buf);
        printf("set boardid=%s\n", buf);

        p = get_local_var("IVM_HWKey");
        if (p == NULL) {
                printf("can't get the IVM_HWKey\n");
                return 1;
        }
        sprintf((char *)buf, "%s", p);
        setenv("hwkey", (char *)buf);
        printf("set hwkey=%s\n", buf);
        printf("Execute manually saveenv for persistent storage.\n");

        return 0;
}

U_BOOT_CMD(km_setboardid, 1, 0, do_setboardid, "setboardid", "read out bid and "
                                 "hwkey from IVM and set in environment");

/*
 * command km_checkbidhwk
 *      if "boardid" and "hwkey" are not already set in the environment, do:
 *              if a "boardIdListHex" exists in the environment:
 *                      - read ivm data for boardid and hwkey
 *                      - compare each entry of the boardIdListHex with the
 *                              IVM data:
 *                      if match:
 *                              set environment variables boardid, boardId,
 *                              hwkey, hwKey to the found values
 *                              both (boardid and boardId) are set because
 *                              they might be used differently in the
 *                              application and in the init scripts (?)
 *      return 0 in case of match, 1 if not match or error
 */
int do_checkboardidhwk(cmd_tbl_t *cmdtp, int flag, int argc,
                        char *const argv[])
{
        unsigned long ivmbid = 0, ivmhwkey = 0;
        unsigned long envbid = 0, envhwkey = 0;
        char *p;
        int verbose = argc > 1 && *argv[1] == 'v';
        int rc = 0;

        /*
         * first read out the real inventory values, these values are
         * already stored in the local hush variables
         */
        p = get_local_var("IVM_BoardId");
        if (p == NULL) {
                printf("can't get the IVM_Boardid\n");
                return 1;
        }
        rc = strict_strtoul(p, 16, &ivmbid);

        p = get_local_var("IVM_HWKey");
        if (p == NULL) {
                printf("can't get the IVM_HWKey\n");
                return 1;
        }
        rc = strict_strtoul(p, 16, &ivmhwkey);

        if (!ivmbid || !ivmhwkey) {
                printf("Error: IVM_BoardId and/or IVM_HWKey not set!\n");
                return rc;
        }

        /* now try to read values from environment if available */
        p = getenv("boardid");
        if (p != NULL)
                rc = strict_strtoul(p, 16, &envbid);
        p = getenv("hwkey");
        if (p != NULL)
                rc = strict_strtoul(p, 16, &envhwkey);

        if (rc != 0) {
                printf("strict_strtoul returns error: %d", rc);
                return rc;
        }

        if (!envbid || !envhwkey) {
                /*
                 * BoardId/HWkey not available in the environment, so try the
                 * environment variable for BoardId/HWkey list
                 */
                char *bidhwklist = getenv("boardIdListHex");

                if (bidhwklist) {
                        int found = 0;
                        char *rest = bidhwklist;
                        char *endp;

                        if (verbose) {
                                printf("IVM_BoardId: %ld, IVM_HWKey=%ld\n",
                                        ivmbid, ivmhwkey);
                                printf("boardIdHwKeyList: %s\n",
                                        bidhwklist);
                        }
                        while (!found) {
                                /* loop over each bid/hwkey pair in the list */
                                unsigned long bid   = 0;
                                unsigned long hwkey = 0;

                                while (*rest && !isxdigit(*rest))
                                        rest++;
                                /*
                                 * use simple_strtoul because we need &end and
                                 * we know we got non numeric char at the end
                                 */
                                bid = simple_strtoul(rest, &endp, 16);
                                /* BoardId and HWkey are separated with a "_" */
                                if (*endp == '_') {
                                        rest  = endp + 1;
                                        /*
                                         * use simple_strtoul because we need
                                         * &end
                                         */
                                        hwkey = simple_strtoul(rest, &endp, 16);
                                        rest  = endp;
                                        while (*rest && !isxdigit(*rest))
                                                rest++;
                                }
                                if ((!bid) || (!hwkey)) {
                                        /* end of list */
                                        break;
                                }
                                if (verbose) {
                                        printf("trying bid=0x%lX, hwkey=%ld\n",
                                                bid, hwkey);
                                }
                                /*
                                 * Compare the values of the found entry in the
                                 * list with the valid values which are stored
                                 * in the inventory eeprom. If they are equal
                                 * set the values in environment variables.
                                 */
                                if ((bid == ivmbid) && (hwkey == ivmhwkey)) {
                                        char buf[10];

                                        found = 1;
                                        envbid   = bid;
                                        envhwkey = hwkey;
                                        sprintf(buf, "%lx", bid);
                                        setenv("boardid", buf);
                                        sprintf(buf, "%lx", hwkey);
                                        setenv("hwkey", buf);
                                }
                        } /* end while( ! found ) */
                }
        }

        /* compare now the values */
        if ((ivmbid == envbid) && (ivmhwkey == envhwkey)) {
                printf("boardid=0x%3lX, hwkey=%ld\n", envbid, envhwkey);
                rc = 0; /* match */
        } else {
                printf("Error: env boardid=0x%3lX, hwkey=%ld\n", envbid,
                        envhwkey);
                printf("       IVM bId=0x%3lX, hwKey=%ld\n", ivmbid, ivmhwkey);
                rc = 1; /* don't match */
        }
        return rc;
}

U_BOOT_CMD(km_checkbidhwk, 2, 0, do_checkboardidhwk,
                "check boardid and hwkey",
                "[v]\n  - check environment parameter "\
                "\"boardIdListHex\" against stored boardid and hwkey "\
                "from the IVM\n    v: verbose output"
);