Archipelago » qemu

/*

 * TI TWL92230C energy-management companion device for the OMAP24xx.

 * Aka. Menelaus (N4200 MENELAUS1_V2.2)

 *

 * Copyright (C) 2008 Nokia Corporation

 * Written by Andrzej Zaborowski <andrew@openedhand.com>

 *

 * 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 or

 * (at your option) version 3 of the License.

 *

 * 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, see <http://www.gnu.org/licenses/>.

 */

#include "hw.h"

#include "qemu-timer.h"

#include "i2c.h"

#include "sysemu.h"

#include "console.h"

#define VERBOSE 1

typedef struct {

    i2c_slave i2c;

    int firstbyte;

    uint8_t reg;

    uint8_t vcore[5];

    uint8_t dcdc[3];

    uint8_t ldo[8];

    uint8_t sleep[2];

    uint8_t osc;

    uint8_t detect;

    uint16_t mask;

    uint16_t status;

    uint8_t dir;

    uint8_t inputs;

    uint8_t outputs;

    uint8_t bbsms;

    uint8_t pull[4];

    uint8_t mmc_ctrl[3];

    uint8_t mmc_debounce;

    struct {

        uint8_t ctrl;

        uint16_t comp;

        QEMUTimer *hz_tm;

        int64_t next;

        struct tm tm;

        struct tm new;

        struct tm alm;

        int sec_offset;

        int alm_sec;

        int next_comp;

    } rtc;

    uint16_t rtc_next_vmstate;

    qemu_irq out[4];

    qemu_irq *in;

    uint8_t pwrbtn_state;

    qemu_irq pwrbtn;

} MenelausState;

static inline void menelaus_update(MenelausState *s)

{

    qemu_set_irq(s->out[3], s->status & ~s->mask);

}

static inline void menelaus_rtc_start(MenelausState *s)

{

    s->rtc.next += qemu_get_clock(rt_clock);

    qemu_mod_timer(s->rtc.hz_tm, s->rtc.next);

}

static inline void menelaus_rtc_stop(MenelausState *s)

{

    qemu_del_timer(s->rtc.hz_tm);

    s->rtc.next -= qemu_get_clock(rt_clock);

    if (s->rtc.next < 1)

        s->rtc.next = 1;

}

static void menelaus_rtc_update(MenelausState *s)

{

    qemu_get_timedate(&s->rtc.tm, s->rtc.sec_offset);

}

static void menelaus_alm_update(MenelausState *s)

{

    if ((s->rtc.ctrl & 3) == 3)

        s->rtc.alm_sec = qemu_timedate_diff(&s->rtc.alm) - s->rtc.sec_offset;

}

static void menelaus_rtc_hz(void *opaque)

{

    MenelausState *s = (MenelausState *) opaque;

    s->rtc.next_comp --;

    s->rtc.alm_sec --;

    s->rtc.next += 1000;

    qemu_mod_timer(s->rtc.hz_tm, s->rtc.next);

    if ((s->rtc.ctrl >> 3) & 3) {                                /* EVERY */

        menelaus_rtc_update(s);

        if (((s->rtc.ctrl >> 3) & 3) == 1 && !s->rtc.tm.tm_sec)

            s->status |= 1 << 8;                                /* RTCTMR */

        else if (((s->rtc.ctrl >> 3) & 3) == 2 && !s->rtc.tm.tm_min)

            s->status |= 1 << 8;                                /* RTCTMR */

        else if (!s->rtc.tm.tm_hour)

            s->status |= 1 << 8;                                /* RTCTMR */

    } else

        s->status |= 1 << 8;                                        /* RTCTMR */

    if ((s->rtc.ctrl >> 1) & 1) {                                /* RTC_AL_EN */

        if (s->rtc.alm_sec == 0)

            s->status |= 1 << 9;                                /* RTCALM */

        /* TODO: wake-up */

    }

    if (s->rtc.next_comp <= 0) {

        s->rtc.next -= muldiv64((int16_t) s->rtc.comp, 1000, 0x8000);

        s->rtc.next_comp = 3600;

    }

    menelaus_update(s);

}

static void menelaus_reset(i2c_slave *i2c)

{

    MenelausState *s = (MenelausState *) i2c;

    s->reg = 0x00;

    s->vcore[0] = 0x0c;        /* XXX: X-loader needs 0x8c? check!  */

    s->vcore[1] = 0x05;

    s->vcore[2] = 0x02;

    s->vcore[3] = 0x0c;

    s->vcore[4] = 0x03;

    s->dcdc[0] = 0x33;        /* Depends on wiring */

    s->dcdc[1] = 0x03;

    s->dcdc[2] = 0x00;

    s->ldo[0] = 0x95;

    s->ldo[1] = 0x7e;

    s->ldo[2] = 0x00;

    s->ldo[3] = 0x00;        /* Depends on wiring */

    s->ldo[4] = 0x03;        /* Depends on wiring */

    s->ldo[5] = 0x00;

    s->ldo[6] = 0x00;

    s->ldo[7] = 0x00;

    s->sleep[0] = 0x00;

    s->sleep[1] = 0x00;

    s->osc = 0x01;

    s->detect = 0x09;

    s->mask = 0x0fff;

    s->status = 0;

    s->dir = 0x07;

    s->outputs = 0x00;

    s->bbsms = 0x00;

    s->pull[0] = 0x00;

    s->pull[1] = 0x00;

    s->pull[2] = 0x00;

    s->pull[3] = 0x00;

    s->mmc_ctrl[0] = 0x03;

    s->mmc_ctrl[1] = 0xc0;

    s->mmc_ctrl[2] = 0x00;

    s->mmc_debounce = 0x05;

    if (s->rtc.ctrl & 1)

        menelaus_rtc_stop(s);

    s->rtc.ctrl = 0x00;

    s->rtc.comp = 0x0000;

    s->rtc.next = 1000;

    s->rtc.sec_offset = 0;

    s->rtc.next_comp = 1800;

    s->rtc.alm_sec = 1800;

    s->rtc.alm.tm_sec = 0x00;

    s->rtc.alm.tm_min = 0x00;

    s->rtc.alm.tm_hour = 0x00;

    s->rtc.alm.tm_mday = 0x01;

    s->rtc.alm.tm_mon = 0x00;

    s->rtc.alm.tm_year = 2004;

    menelaus_update(s);

}

static void menelaus_gpio_set(void *opaque, int line, int level)

{

    MenelausState *s = (MenelausState *) opaque;

    /* No interrupt generated */

    s->inputs &= ~(1 << line);

    s->inputs |= level << line;

}

static void menelaus_pwrbtn_set(void *opaque, int line, int level)

{

    MenelausState *s = (MenelausState *) opaque;

    if (!s->pwrbtn_state && level) {

        s->status |= 1 << 11;                                        /* PSHBTN */

        menelaus_update(s);

    }

    s->pwrbtn_state = level;

}

#define MENELAUS_REV                0x01

#define MENELAUS_VCORE_CTRL1        0x02

#define MENELAUS_VCORE_CTRL2        0x03

#define MENELAUS_VCORE_CTRL3        0x04

#define MENELAUS_VCORE_CTRL4        0x05

#define MENELAUS_VCORE_CTRL5        0x06

#define MENELAUS_DCDC_CTRL1        0x07

#define MENELAUS_DCDC_CTRL2        0x08

#define MENELAUS_DCDC_CTRL3        0x09

#define MENELAUS_LDO_CTRL1        0x0a

#define MENELAUS_LDO_CTRL2        0x0b

#define MENELAUS_LDO_CTRL3        0x0c

#define MENELAUS_LDO_CTRL4        0x0d

#define MENELAUS_LDO_CTRL5        0x0e

#define MENELAUS_LDO_CTRL6        0x0f

#define MENELAUS_LDO_CTRL7        0x10

#define MENELAUS_LDO_CTRL8        0x11

#define MENELAUS_SLEEP_CTRL1        0x12

#define MENELAUS_SLEEP_CTRL2        0x13

#define MENELAUS_DEVICE_OFF        0x14

#define MENELAUS_OSC_CTRL        0x15

#define MENELAUS_DETECT_CTRL        0x16

#define MENELAUS_INT_MASK1        0x17

#define MENELAUS_INT_MASK2        0x18

#define MENELAUS_INT_STATUS1        0x19

#define MENELAUS_INT_STATUS2        0x1a

#define MENELAUS_INT_ACK1        0x1b

#define MENELAUS_INT_ACK2        0x1c

#define MENELAUS_GPIO_CTRL        0x1d

#define MENELAUS_GPIO_IN        0x1e

#define MENELAUS_GPIO_OUT        0x1f

#define MENELAUS_BBSMS                0x20

#define MENELAUS_RTC_CTRL        0x21

#define MENELAUS_RTC_UPDATE        0x22

#define MENELAUS_RTC_SEC        0x23

#define MENELAUS_RTC_MIN        0x24

#define MENELAUS_RTC_HR                0x25

#define MENELAUS_RTC_DAY        0x26

#define MENELAUS_RTC_MON        0x27

#define MENELAUS_RTC_YR                0x28

#define MENELAUS_RTC_WKDAY        0x29

#define MENELAUS_RTC_AL_SEC        0x2a

#define MENELAUS_RTC_AL_MIN        0x2b

#define MENELAUS_RTC_AL_HR        0x2c

#define MENELAUS_RTC_AL_DAY        0x2d

#define MENELAUS_RTC_AL_MON        0x2e

#define MENELAUS_RTC_AL_YR        0x2f

#define MENELAUS_RTC_COMP_MSB        0x30

#define MENELAUS_RTC_COMP_LSB        0x31

#define MENELAUS_S1_PULL_EN        0x32

#define MENELAUS_S1_PULL_DIR        0x33

#define MENELAUS_S2_PULL_EN        0x34

#define MENELAUS_S2_PULL_DIR        0x35

#define MENELAUS_MCT_CTRL1        0x36

#define MENELAUS_MCT_CTRL2        0x37

#define MENELAUS_MCT_CTRL3        0x38

#define MENELAUS_MCT_PIN_ST        0x39

#define MENELAUS_DEBOUNCE1        0x3a

static uint8_t menelaus_read(void *opaque, uint8_t addr)

{

    MenelausState *s = (MenelausState *) opaque;

    int reg = 0;

    switch (addr) {

    case MENELAUS_REV:

        return 0x22;

    case MENELAUS_VCORE_CTRL5: reg ++;

    case MENELAUS_VCORE_CTRL4: reg ++;

    case MENELAUS_VCORE_CTRL3: reg ++;

    case MENELAUS_VCORE_CTRL2: reg ++;

    case MENELAUS_VCORE_CTRL1:

        return s->vcore[reg];

    case MENELAUS_DCDC_CTRL3: reg ++;

    case MENELAUS_DCDC_CTRL2: reg ++;

    case MENELAUS_DCDC_CTRL1:

        return s->dcdc[reg];

    case MENELAUS_LDO_CTRL8: reg ++;

    case MENELAUS_LDO_CTRL7: reg ++;

    case MENELAUS_LDO_CTRL6: reg ++;

    case MENELAUS_LDO_CTRL5: reg ++;

    case MENELAUS_LDO_CTRL4: reg ++;

    case MENELAUS_LDO_CTRL3: reg ++;

    case MENELAUS_LDO_CTRL2: reg ++;

    case MENELAUS_LDO_CTRL1:

        return s->ldo[reg];

    case MENELAUS_SLEEP_CTRL2: reg ++;

    case MENELAUS_SLEEP_CTRL1:

        return s->sleep[reg];

    case MENELAUS_DEVICE_OFF:

        return 0;

    case MENELAUS_OSC_CTRL:

        return s->osc | (1 << 7);                        /* CLK32K_GOOD */

    case MENELAUS_DETECT_CTRL:

        return s->detect;

    case MENELAUS_INT_MASK1:

        return (s->mask >> 0) & 0xff;

    case MENELAUS_INT_MASK2:

        return (s->mask >> 8) & 0xff;

    case MENELAUS_INT_STATUS1:

        return (s->status >> 0) & 0xff;

    case MENELAUS_INT_STATUS2:

        return (s->status >> 8) & 0xff;

    case MENELAUS_INT_ACK1:

    case MENELAUS_INT_ACK2:

        return 0;

    case MENELAUS_GPIO_CTRL:

        return s->dir;

    case MENELAUS_GPIO_IN:

        return s->inputs | (~s->dir & s->outputs);

    case MENELAUS_GPIO_OUT:

        return s->outputs;

    case MENELAUS_BBSMS:

        return s->bbsms;

    case MENELAUS_RTC_CTRL:

        return s->rtc.ctrl;

    case MENELAUS_RTC_UPDATE:

        return 0x00;

    case MENELAUS_RTC_SEC:

        menelaus_rtc_update(s);

        return to_bcd(s->rtc.tm.tm_sec);

    case MENELAUS_RTC_MIN:

        menelaus_rtc_update(s);

        return to_bcd(s->rtc.tm.tm_min);

    case MENELAUS_RTC_HR:

        menelaus_rtc_update(s);

        if ((s->rtc.ctrl >> 2) & 1)                        /* MODE12_n24 */

            return to_bcd((s->rtc.tm.tm_hour % 12) + 1) |

                    (!!(s->rtc.tm.tm_hour >= 12) << 7);        /* PM_nAM */

        else

            return to_bcd(s->rtc.tm.tm_hour);

    case MENELAUS_RTC_DAY:

        menelaus_rtc_update(s);

        return to_bcd(s->rtc.tm.tm_mday);

    case MENELAUS_RTC_MON:

        menelaus_rtc_update(s);

        return to_bcd(s->rtc.tm.tm_mon + 1);

    case MENELAUS_RTC_YR:

        menelaus_rtc_update(s);

        return to_bcd(s->rtc.tm.tm_year - 2000);

    case MENELAUS_RTC_WKDAY:

        menelaus_rtc_update(s);

        return to_bcd(s->rtc.tm.tm_wday);

    case MENELAUS_RTC_AL_SEC:

        return to_bcd(s->rtc.alm.tm_sec);

    case MENELAUS_RTC_AL_MIN:

        return to_bcd(s->rtc.alm.tm_min);

    case MENELAUS_RTC_AL_HR:

        if ((s->rtc.ctrl >> 2) & 1)                        /* MODE12_n24 */

            return to_bcd((s->rtc.alm.tm_hour % 12) + 1) |

                    (!!(s->rtc.alm.tm_hour >= 12) << 7);/* AL_PM_nAM */

        else

            return to_bcd(s->rtc.alm.tm_hour);

    case MENELAUS_RTC_AL_DAY:

        return to_bcd(s->rtc.alm.tm_mday);

    case MENELAUS_RTC_AL_MON:

        return to_bcd(s->rtc.alm.tm_mon + 1);

    case MENELAUS_RTC_AL_YR:

        return to_bcd(s->rtc.alm.tm_year - 2000);

    case MENELAUS_RTC_COMP_MSB:

        return (s->rtc.comp >> 8) & 0xff;

    case MENELAUS_RTC_COMP_LSB:

        return (s->rtc.comp >> 0) & 0xff;

    case MENELAUS_S1_PULL_EN:

        return s->pull[0];

    case MENELAUS_S1_PULL_DIR:

        return s->pull[1];

    case MENELAUS_S2_PULL_EN:

        return s->pull[2];

    case MENELAUS_S2_PULL_DIR:

        return s->pull[3];

    case MENELAUS_MCT_CTRL3: reg ++;

    case MENELAUS_MCT_CTRL2: reg ++;

    case MENELAUS_MCT_CTRL1:

        return s->mmc_ctrl[reg];

    case MENELAUS_MCT_PIN_ST:

        /* TODO: return the real Card Detect */

        return 0;

    case MENELAUS_DEBOUNCE1:

        return s->mmc_debounce;

    default:

#ifdef VERBOSE

        printf("%s: unknown register %02x\n", __FUNCTION__, addr);

#endif

        break;

    }

    return 0;

}

static void menelaus_write(void *opaque, uint8_t addr, uint8_t value)

{

    MenelausState *s = (MenelausState *) opaque;

    int line;

    int reg = 0;

    struct tm tm;

    switch (addr) {

    case MENELAUS_VCORE_CTRL1:

        s->vcore[0] = (value & 0xe) | MIN(value & 0x1f, 0x12);

        break;

    case MENELAUS_VCORE_CTRL2:

        s->vcore[1] = value;

        break;

    case MENELAUS_VCORE_CTRL3:

        s->vcore[2] = MIN(value & 0x1f, 0x12);

        break;

    case MENELAUS_VCORE_CTRL4:

        s->vcore[3] = MIN(value & 0x1f, 0x12);

        break;

    case MENELAUS_VCORE_CTRL5:

        s->vcore[4] = value & 3;

        /* XXX

         * auto set to 3 on M_Active, nRESWARM

         * auto set to 0 on M_WaitOn, M_Backup

         */

        break;

    case MENELAUS_DCDC_CTRL1:

        s->dcdc[0] = value & 0x3f;

        break;

    case MENELAUS_DCDC_CTRL2:

        s->dcdc[1] = value & 0x07;

        /* XXX

         * auto set to 3 on M_Active, nRESWARM

         * auto set to 0 on M_WaitOn, M_Backup

         */

        break;

    case MENELAUS_DCDC_CTRL3:

        s->dcdc[2] = value & 0x07;

        break;

    case MENELAUS_LDO_CTRL1:

        s->ldo[0] = value;

        break;

    case MENELAUS_LDO_CTRL2:

        s->ldo[1] = value & 0x7f;

        /* XXX

         * auto set to 0x7e on M_WaitOn, M_Backup

         */

        break;

    case MENELAUS_LDO_CTRL3:

        s->ldo[2] = value & 3;

        /* XXX

         * auto set to 3 on M_Active, nRESWARM

         * auto set to 0 on M_WaitOn, M_Backup

         */

        break;

    case MENELAUS_LDO_CTRL4:

        s->ldo[3] = value & 3;

        /* XXX

         * auto set to 3 on M_Active, nRESWARM

         * auto set to 0 on M_WaitOn, M_Backup

         */

        break;

    case MENELAUS_LDO_CTRL5:

        s->ldo[4] = value & 3;

        /* XXX

         * auto set to 3 on M_Active, nRESWARM

         * auto set to 0 on M_WaitOn, M_Backup

         */

        break;

    case MENELAUS_LDO_CTRL6:

        s->ldo[5] = value & 3;

        break;

    case MENELAUS_LDO_CTRL7:

        s->ldo[6] = value & 3;

        break;

    case MENELAUS_LDO_CTRL8:

        s->ldo[7] = value & 3;

        break;

    case MENELAUS_SLEEP_CTRL2: reg ++;

    case MENELAUS_SLEEP_CTRL1:

        s->sleep[reg] = value;

        break;

    case MENELAUS_DEVICE_OFF:

        if (value & 1)

            menelaus_reset(&s->i2c);

        break;

    case MENELAUS_OSC_CTRL:

        s->osc = value & 7;

        break;

    case MENELAUS_DETECT_CTRL:

        s->detect = value & 0x7f;

        break;

    case MENELAUS_INT_MASK1:

        s->mask &= 0xf00;

        s->mask |= value << 0;

        menelaus_update(s);

        break;

    case MENELAUS_INT_MASK2:

        s->mask &= 0x0ff;

        s->mask |= value << 8;

        menelaus_update(s);

        break;

    case MENELAUS_INT_ACK1:

        s->status &= ~(((uint16_t) value) << 0);

        menelaus_update(s);

        break;

    case MENELAUS_INT_ACK2:

        s->status &= ~(((uint16_t) value) << 8);

        menelaus_update(s);

        break;

    case MENELAUS_GPIO_CTRL:

        for (line = 0; line < 3; line ++) {

            if (((s->dir ^ value) >> line) & 1) {

                qemu_set_irq(s->out[line],

                             ((s->outputs & ~s->dir) >> line) & 1);

            }

        }

        s->dir = value & 0x67;

        break;

    case MENELAUS_GPIO_OUT:

        for (line = 0; line < 3; line ++) {

            if ((((s->outputs ^ value) & ~s->dir) >> line) & 1) {

                qemu_set_irq(s->out[line], (s->outputs >> line) & 1);

            }

        }

        s->outputs = value & 0x07;

        break;

    case MENELAUS_BBSMS:

        s->bbsms = 0x0d;

        break;

    case MENELAUS_RTC_CTRL:

        if ((s->rtc.ctrl ^ value) & 1) {                        /* RTC_EN */

            if (value & 1)

                menelaus_rtc_start(s);

            else

                menelaus_rtc_stop(s);

        }

        s->rtc.ctrl = value & 0x1f;

        menelaus_alm_update(s);

        break;

    case MENELAUS_RTC_UPDATE:

        menelaus_rtc_update(s);

        memcpy(&tm, &s->rtc.tm, sizeof(tm));

        switch (value & 0xf) {

        case 0:

            break;

        case 1:

            tm.tm_sec = s->rtc.new.tm_sec;

            break;

        case 2:

            tm.tm_min = s->rtc.new.tm_min;

            break;

        case 3:

            if (s->rtc.new.tm_hour > 23)

                goto rtc_badness;

            tm.tm_hour = s->rtc.new.tm_hour;

            break;

        case 4:

            if (s->rtc.new.tm_mday < 1)

                goto rtc_badness;

            /* TODO check range */

            tm.tm_mday = s->rtc.new.tm_mday;

            break;

        case 5:

            if (s->rtc.new.tm_mon < 0 || s->rtc.new.tm_mon > 11)

                goto rtc_badness;

            tm.tm_mon = s->rtc.new.tm_mon;

            break;

        case 6:

            tm.tm_year = s->rtc.new.tm_year;

            break;

        case 7:

            /* TODO set .tm_mday instead */

            tm.tm_wday = s->rtc.new.tm_wday;

            break;

        case 8:

            if (s->rtc.new.tm_hour > 23)

                goto rtc_badness;

            if (s->rtc.new.tm_mday < 1)

                goto rtc_badness;

            if (s->rtc.new.tm_mon < 0 || s->rtc.new.tm_mon > 11)

                goto rtc_badness;

            tm.tm_sec = s->rtc.new.tm_sec;

            tm.tm_min = s->rtc.new.tm_min;

            tm.tm_hour = s->rtc.new.tm_hour;

            tm.tm_mday = s->rtc.new.tm_mday;

            tm.tm_mon = s->rtc.new.tm_mon;

            tm.tm_year = s->rtc.new.tm_year;

            break;

        rtc_badness:

        default:

            fprintf(stderr, "%s: bad RTC_UPDATE value %02x\n",

                            __FUNCTION__, value);

            s->status |= 1 << 10;                                /* RTCERR */

            menelaus_update(s);

        }

        s->rtc.sec_offset = qemu_timedate_diff(&tm);

        break;

    case MENELAUS_RTC_SEC:

        s->rtc.tm.tm_sec = from_bcd(value & 0x7f);

        break;

    case MENELAUS_RTC_MIN:

        s->rtc.tm.tm_min = from_bcd(value & 0x7f);

        break;

    case MENELAUS_RTC_HR:

        s->rtc.tm.tm_hour = (s->rtc.ctrl & (1 << 2)) ?        /* MODE12_n24 */

                MIN(from_bcd(value & 0x3f), 12) + ((value >> 7) ? 11 : -1) :

                from_bcd(value & 0x3f);

        break;

    case MENELAUS_RTC_DAY:

        s->rtc.tm.tm_mday = from_bcd(value);

        break;

    case MENELAUS_RTC_MON:

        s->rtc.tm.tm_mon = MAX(1, from_bcd(value)) - 1;

        break;

    case MENELAUS_RTC_YR:

        s->rtc.tm.tm_year = 2000 + from_bcd(value);

        break;

    case MENELAUS_RTC_WKDAY:

        s->rtc.tm.tm_mday = from_bcd(value);

        break;

    case MENELAUS_RTC_AL_SEC:

        s->rtc.alm.tm_sec = from_bcd(value & 0x7f);

        menelaus_alm_update(s);

        break;

    case MENELAUS_RTC_AL_MIN:

        s->rtc.alm.tm_min = from_bcd(value & 0x7f);

        menelaus_alm_update(s);

        break;

    case MENELAUS_RTC_AL_HR:

        s->rtc.alm.tm_hour = (s->rtc.ctrl & (1 << 2)) ?        /* MODE12_n24 */

                MIN(from_bcd(value & 0x3f), 12) + ((value >> 7) ? 11 : -1) :

                from_bcd(value & 0x3f);

        menelaus_alm_update(s);

        break;

    case MENELAUS_RTC_AL_DAY:

        s->rtc.alm.tm_mday = from_bcd(value);

        menelaus_alm_update(s);

        break;

    case MENELAUS_RTC_AL_MON:

        s->rtc.alm.tm_mon = MAX(1, from_bcd(value)) - 1;

        menelaus_alm_update(s);

        break;

    case MENELAUS_RTC_AL_YR:

        s->rtc.alm.tm_year = 2000 + from_bcd(value);

        menelaus_alm_update(s);

        break;

    case MENELAUS_RTC_COMP_MSB:

        s->rtc.comp &= 0xff;

        s->rtc.comp |= value << 8;

        break;

    case MENELAUS_RTC_COMP_LSB:

        s->rtc.comp &= 0xff << 8;

        s->rtc.comp |= value;

        break;

    case MENELAUS_S1_PULL_EN:

        s->pull[0] = value;

        break;

    case MENELAUS_S1_PULL_DIR:

        s->pull[1] = value & 0x1f;

        break;

    case MENELAUS_S2_PULL_EN:

        s->pull[2] = value;

        break;

    case MENELAUS_S2_PULL_DIR:

        s->pull[3] = value & 0x1f;

        break;

    case MENELAUS_MCT_CTRL1:

        s->mmc_ctrl[0] = value & 0x7f;

        break;

    case MENELAUS_MCT_CTRL2:

        s->mmc_ctrl[1] = value;

        /* TODO update Card Detect interrupts */

        break;

    case MENELAUS_MCT_CTRL3:

        s->mmc_ctrl[2] = value & 0xf;

        break;

    case MENELAUS_DEBOUNCE1:

        s->mmc_debounce = value & 0x3f;

        break;

    default:

#ifdef VERBOSE

        printf("%s: unknown register %02x\n", __FUNCTION__, addr);

#endif

    }

}

static void menelaus_event(i2c_slave *i2c, enum i2c_event event)

{

    MenelausState *s = (MenelausState *) i2c;

    if (event == I2C_START_SEND)

        s->firstbyte = 1;

}

static int menelaus_tx(i2c_slave *i2c, uint8_t data)

{

    MenelausState *s = (MenelausState *) i2c;

    /* Interpret register address byte */

    if (s->firstbyte) {

        s->reg = data;

        s->firstbyte = 0;

    } else

        menelaus_write(s, s->reg ++, data);

    return 0;

}

static int menelaus_rx(i2c_slave *i2c)

{

    MenelausState *s = (MenelausState *) i2c;

    return menelaus_read(s, s->reg ++);

}

/* Save restore 32 bit int as uint16_t

   This is a Big hack, but it is how the old state did it.

   Or we broke compatibility in the state, or we can't use struct tm

 */

static int get_int32_as_uint16(QEMUFile *f, void *pv, size_t size)

{

    int *v = pv;

    *v = qemu_get_be16(f);

    return 0;

}

static void put_int32_as_uint16(QEMUFile *f, void *pv, size_t size)

{

    int *v = pv;

    qemu_put_be16(f, *v);

}

static const VMStateInfo vmstate_hack_int32_as_uint16 = {

    .name = "int32_as_uint16",

    .get  = get_int32_as_uint16,

    .put  = put_int32_as_uint16,

};

#define VMSTATE_UINT16_HACK(_f, _s)                                  \

    VMSTATE_SINGLE(_f, _s, 0, vmstate_hack_int32_as_uint16, int32_t)

static const VMStateDescription vmstate_menelaus_tm = {

    .name = "menelaus_tm",

    .version_id = 0,

    .minimum_version_id = 0,

    .minimum_version_id_old = 0,

    .fields      = (VMStateField []) {

        VMSTATE_UINT16_HACK(tm_sec, struct tm),

        VMSTATE_UINT16_HACK(tm_min, struct tm),

        VMSTATE_UINT16_HACK(tm_hour, struct tm),

        VMSTATE_UINT16_HACK(tm_mday, struct tm),

        VMSTATE_UINT16_HACK(tm_min, struct tm),

        VMSTATE_UINT16_HACK(tm_year, struct tm),

        VMSTATE_END_OF_LIST()

    }

};

static void menelaus_pre_save(void *opaque)

{

    MenelausState *s = opaque;

    /* Should be <= 1000 */

    s->rtc_next_vmstate =  s->rtc.next - qemu_get_clock(rt_clock);

}

static int menelaus_post_load(void *opaque, int version_id)

{

    MenelausState *s = opaque;

    if (s->rtc.ctrl & 1)                                        /* RTC_EN */

        menelaus_rtc_stop(s);

    s->rtc.next = s->rtc_next_vmstate;

    menelaus_alm_update(s);

    menelaus_update(s);

    if (s->rtc.ctrl & 1)                                        /* RTC_EN */

        menelaus_rtc_start(s);

    return 0;

}

static const VMStateDescription vmstate_menelaus = {

    .name = "menelaus",

    .version_id = 0,

    .minimum_version_id = 0,

    .minimum_version_id_old = 0,

    .pre_save = menelaus_pre_save,

    .post_load = menelaus_post_load,

    .fields      = (VMStateField []) {

        VMSTATE_INT32(firstbyte, MenelausState),

        VMSTATE_UINT8(reg, MenelausState),

        VMSTATE_UINT8_ARRAY(vcore, MenelausState, 5),

        VMSTATE_UINT8_ARRAY(dcdc, MenelausState, 3),

        VMSTATE_UINT8_ARRAY(ldo, MenelausState, 8),

        VMSTATE_UINT8_ARRAY(sleep, MenelausState, 2),

        VMSTATE_UINT8(osc, MenelausState),

        VMSTATE_UINT8(detect, MenelausState),

        VMSTATE_UINT16(mask, MenelausState),

        VMSTATE_UINT16(status, MenelausState),

        VMSTATE_UINT8(dir, MenelausState),

        VMSTATE_UINT8(inputs, MenelausState),

        VMSTATE_UINT8(outputs, MenelausState),

        VMSTATE_UINT8(bbsms, MenelausState),

        VMSTATE_UINT8_ARRAY(pull, MenelausState, 4),

        VMSTATE_UINT8_ARRAY(mmc_ctrl, MenelausState, 3),

        VMSTATE_UINT8(mmc_debounce, MenelausState),

        VMSTATE_UINT8(rtc.ctrl, MenelausState),

        VMSTATE_UINT16(rtc.comp, MenelausState),

        VMSTATE_UINT16(rtc_next_vmstate, MenelausState),

        VMSTATE_STRUCT(rtc.new, MenelausState, 0, vmstate_menelaus_tm,

                       struct tm),

        VMSTATE_STRUCT(rtc.alm, MenelausState, 0, vmstate_menelaus_tm,

                       struct tm),

        VMSTATE_UINT8(pwrbtn_state, MenelausState),

        VMSTATE_I2C_SLAVE(i2c, MenelausState),

        VMSTATE_END_OF_LIST()

    }

};

static int twl92230_init(i2c_slave *i2c)

{

    MenelausState *s = FROM_I2C_SLAVE(MenelausState, i2c);

    s->rtc.hz_tm = qemu_new_timer(rt_clock, menelaus_rtc_hz, s);

    /* Three output pins plus one interrupt pin.  */

    qdev_init_gpio_out(&i2c->qdev, s->out, 4);

    qdev_init_gpio_in(&i2c->qdev, menelaus_gpio_set, 3);

    s->pwrbtn = qemu_allocate_irqs(menelaus_pwrbtn_set, s, 1)[0];

    menelaus_reset(&s->i2c);

    return 0;

}

static I2CSlaveInfo twl92230_info = {

    .qdev.name ="twl92230",

    .qdev.size = sizeof(MenelausState),

    .qdev.vmsd = &vmstate_menelaus,

    .init = twl92230_init,

    .event = menelaus_event,

    .recv = menelaus_rx,

    .send = menelaus_tx

};

static void twl92230_register_devices(void)

{

    i2c_register_slave(&twl92230_info);

}

device_init(twl92230_register_devices)