/*
 * (C) Copyright 2008 Dmitry Rakhchev, EmCraft Systems, rda@emcraft.com
 *
 * Developed for DENX Software Engineering GmbH
 *
 * 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 <post.h>
#include <common.h>

/*
 * SYSMON test
 *
 * This test performs the system hardware monitoring.
 * The test passes when all the following voltages and temperatures
 * are within allowed ranges:
 *
 * Temperature            -40 .. +90 C
 * +5V                  +4.50 .. +5.50 V
 * +5V standby          +3.50 .. +5.50 V
 *
 * LCD backlight is not enabled if temperature values are not within
 * allowed ranges (-30 .. + 80). The brightness of backlite can be
 * controlled by setting "brightness" enviroment variable. Default value is 50%
 *
 * See the list of all parameters in the sysmon_table below
 */

#include <post.h>
#include <watchdog.h>
#include <i2c.h>

#if defined(CONFIG_VIDEO)
#include <mb862xx.h>
#endif

#if CONFIG_POST & CONFIG_SYS_POST_SYSMON

DECLARE_GLOBAL_DATA_PTR;

/* from dspic.c */
extern int dspic_read(ushort reg);

#define REG_TEMPERATURE                 0x12BC
#define REG_VOLTAGE_5V                  0x12CA
#define REG_VOLTAGE_5V_STANDBY          0x12C6

#define TEMPERATURE_MIN                 (-40)   /* degr. C */
#define TEMPERATURE_MAX                 (+90)   /* degr. C */
#define TEMPERATURE_DISPLAY_MIN         (-35)   /* degr. C */
#define TEMPERATURE_DISPLAY_MAX         (+85)   /* degr. C */

#define VOLTAGE_5V_MIN                  (+4500) /* mV */
#define VOLTAGE_5V_MAX                  (+5500) /* mV */

#define VOLTAGE_5V_STANDBY_MIN          (+3500) /* mV */
#define VOLTAGE_5V_STANDBY_MAX          (+5500) /* mV */

typedef struct sysmon_s sysmon_t;
typedef struct sysmon_table_s sysmon_table_t;

static void sysmon_dspic_init (sysmon_t * this);
static int sysmon_dspic_read (sysmon_t * this, uint addr);
static void sysmon_backlight_disable (sysmon_table_t * this);

struct sysmon_s
{
        uchar   chip;
        void    (*init)(sysmon_t *);
        int     (*read)(sysmon_t *, uint);
};

static sysmon_t sysmon_dspic =
        {CONFIG_SYS_I2C_DSPIC_IO_ADDR, sysmon_dspic_init, sysmon_dspic_read};

static sysmon_t * sysmon_list[] =
{
        &sysmon_dspic,
        NULL
};

struct sysmon_table_s
{
        char *          name;
        char *          unit_name;
        sysmon_t *      sysmon;
        void            (*exec_before)(sysmon_table_t *);
        void            (*exec_after)(sysmon_table_t *);

        int             unit_precision;
        int             unit_div;
        int             unit_min;
        int             unit_max;
        uint            val_mask;
        uint            val_min;
        uint            val_max;
        int             val_valid;
        uint            val_min_alt;
        uint            val_max_alt;
        int             val_valid_alt;
        uint            addr;
};

static sysmon_table_t sysmon_table[] =
{
        {
        "Temperature", " C", &sysmon_dspic, NULL, sysmon_backlight_disable,
        1, 1, -32768, 32767, 0xFFFF,
        0x8000 + TEMPERATURE_MIN,         0x8000 + TEMPERATURE_MAX,         0,
        0x8000 + TEMPERATURE_DISPLAY_MIN, 0x8000 + TEMPERATURE_DISPLAY_MAX, 0,
        REG_TEMPERATURE,
        },

        {
        "+ 5 V", "V", &sysmon_dspic, NULL, NULL,
        100, 1000, -0x8000, 0x7FFF, 0xFFFF,
        0x8000 + VOLTAGE_5V_MIN, 0x8000 + VOLTAGE_5V_MAX, 0,
        0x8000 + VOLTAGE_5V_MIN, 0x8000 + VOLTAGE_5V_MAX, 0,
        REG_VOLTAGE_5V,
        },

        {
        "+ 5 V standby", "V", &sysmon_dspic, NULL, NULL,
        100, 1000, -0x8000, 0x7FFF, 0xFFFF,
        0x8000 + VOLTAGE_5V_STANDBY_MIN, 0x8000 + VOLTAGE_5V_STANDBY_MAX, 0,
        0x8000 + VOLTAGE_5V_STANDBY_MIN, 0x8000 + VOLTAGE_5V_STANDBY_MAX, 0,
        REG_VOLTAGE_5V_STANDBY,
        },
};
static int sysmon_table_size = sizeof(sysmon_table) / sizeof(sysmon_table[0]);

int sysmon_init_f (void)
{
        sysmon_t ** l;

        for (l = sysmon_list; *l; l++)
                (*l)->init(*l);

        return 0;
}

void sysmon_reloc (void)
{
        /* Do nothing for now, sysmon_reloc() is required by the sysmon post */
}

static char *sysmon_unit_value (sysmon_table_t *s, uint val)
{
        static char buf[32];
        char *p, sign;
        int decimal, frac;
        int unit_val;

        unit_val = s->unit_min + (s->unit_max - s->unit_min) * val / s->val_mask;

        if (val == -1)
                return "I/O ERROR";

        if (unit_val < 0) {
                sign = '-';
                unit_val = -unit_val;
        } else
                sign = '+';

        p = buf + sprintf(buf, "%c%2d", sign, unit_val / s->unit_div);


        frac = unit_val % s->unit_div;

        frac /= (s->unit_div / s->unit_precision);

        decimal = s->unit_precision;

        if (decimal != 1)
                *p++ = '.';
        for (decimal /= 10; decimal != 0; decimal /= 10)
                *p++ = '0' + (frac / decimal) % 10;
        strcpy(p, s->unit_name);

        return buf;
}

static void sysmon_dspic_init (sysmon_t * this)
{
}

static int sysmon_dspic_read (sysmon_t * this, uint addr)
{
        int res = dspic_read(addr);

        /* To fit into the table range we should add 0x8000 */
        return (res == -1) ? -1 : (res + 0x8000);
}

static void sysmon_backlight_disable (sysmon_table_t * this)
{
#if defined(CONFIG_VIDEO)
        board_backlight_switch(this->val_valid_alt);
#endif
}

int sysmon_post_test (int flags)
{
        int res = 0;
        sysmon_table_t * t;
        int val;

        for (t = sysmon_table; t < sysmon_table + sysmon_table_size; t ++) {
                if (t->exec_before)
                        t->exec_before(t);

                val = t->sysmon->read(t->sysmon, t->addr);
                if (val != -1) {
                        t->val_valid = val >= t->val_min && val <= t->val_max;
                        t->val_valid_alt = val >= t->val_min_alt && val <= t->val_max_alt;
                } else {
                        t->val_valid = 0;
                        t->val_valid_alt = 0;
                }

                if (t->exec_after)
                        t->exec_after(t);

                if ((!t->val_valid) || (flags & POST_MANUAL)) {
                        printf("%-17s = %-10s ", t->name, sysmon_unit_value(t, val));
                        printf("allowed range");
                        printf(" %-8s ..", sysmon_unit_value(t, t->val_min));
                        printf(" %-8s", sysmon_unit_value(t, t->val_max));
                        printf("     %s\n", t->val_valid ? "OK" : "FAIL");
                }

                if (!t->val_valid)
                        res = 1;
        }

        return res;
}
#endif /* CONFIG_POST & CONFIG_SYS_POST_SYSMON */