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/*

 * Intel XScale PXA255/270 OS Timers.

 *

 * Copyright (c) 2006 Openedhand Ltd.

 * Copyright (c) 2006 Thorsten Zitterell

 *

 * This code is licensed under the GPL.

 */

#include "hw.h"

#include "qemu/timer.h"

#include "sysemu.h"

#include "pxa.h"

#include "sysbus.h"

#define OSMR0        0x00

#define OSMR1        0x04

#define OSMR2        0x08

#define OSMR3        0x0c

#define OSMR4        0x80

#define OSMR5        0x84

#define OSMR6        0x88

#define OSMR7        0x8c

#define OSMR8        0x90

#define OSMR9        0x94

#define OSMR10        0x98

#define OSMR11        0x9c

#define OSCR        0x10        /* OS Timer Count */

#define OSCR4        0x40

#define OSCR5        0x44

#define OSCR6        0x48

#define OSCR7        0x4c

#define OSCR8        0x50

#define OSCR9        0x54

#define OSCR10        0x58

#define OSCR11        0x5c

#define OSSR        0x14        /* Timer status register */

#define OWER        0x18

#define OIER        0x1c        /* Interrupt enable register  3-0 to E3-E0 */

#define OMCR4        0xc0        /* OS Match Control registers */

#define OMCR5        0xc4

#define OMCR6        0xc8

#define OMCR7        0xcc

#define OMCR8        0xd0

#define OMCR9        0xd4

#define OMCR10        0xd8

#define OMCR11        0xdc

#define OSNR        0x20

#define PXA25X_FREQ        3686400        /* 3.6864 MHz */

#define PXA27X_FREQ        3250000        /* 3.25 MHz */

static int pxa2xx_timer4_freq[8] = {

    [0] = 0,

    [1] = 32768,

    [2] = 1000,

    [3] = 1,

    [4] = 1000000,

    /* [5] is the "Externally supplied clock".  Assign if necessary.  */

    [5 ... 7] = 0,

};

typedef struct PXA2xxTimerInfo PXA2xxTimerInfo;

typedef struct {

    uint32_t value;

    qemu_irq irq;

    QEMUTimer *qtimer;

    int num;

    PXA2xxTimerInfo *info;

} PXA2xxTimer0;

typedef struct {

    PXA2xxTimer0 tm;

    int32_t oldclock;

    int32_t clock;

    uint64_t lastload;

    uint32_t freq;

    uint32_t control;

} PXA2xxTimer4;

struct PXA2xxTimerInfo {

    SysBusDevice busdev;

    MemoryRegion iomem;

    uint32_t flags;

    int32_t clock;

    int32_t oldclock;

    uint64_t lastload;

    uint32_t freq;

    PXA2xxTimer0 timer[4];

    uint32_t events;

    uint32_t irq_enabled;

    uint32_t reset3;

    uint32_t snapshot;

    qemu_irq irq4;

    PXA2xxTimer4 tm4[8];

};

#define PXA2XX_TIMER_HAVE_TM4        0

static inline int pxa2xx_timer_has_tm4(PXA2xxTimerInfo *s)

{

    return s->flags & (1 << PXA2XX_TIMER_HAVE_TM4);

}

static void pxa2xx_timer_update(void *opaque, uint64_t now_qemu)

{

    PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;

    int i;

    uint32_t now_vm;

    uint64_t new_qemu;

    now_vm = s->clock +

            muldiv64(now_qemu - s->lastload, s->freq, get_ticks_per_sec());

    for (i = 0; i < 4; i ++) {

        new_qemu = now_qemu + muldiv64((uint32_t) (s->timer[i].value - now_vm),

                        get_ticks_per_sec(), s->freq);

        qemu_mod_timer(s->timer[i].qtimer, new_qemu);

    }

}

static void pxa2xx_timer_update4(void *opaque, uint64_t now_qemu, int n)

{

    PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;

    uint32_t now_vm;

    uint64_t new_qemu;

    static const int counters[8] = { 0, 0, 0, 0, 4, 4, 6, 6 };

    int counter;

    if (s->tm4[n].control & (1 << 7))

        counter = n;

    else

        counter = counters[n];

    if (!s->tm4[counter].freq) {

        qemu_del_timer(s->tm4[n].tm.qtimer);

        return;

    }

    now_vm = s->tm4[counter].clock + muldiv64(now_qemu -

                    s->tm4[counter].lastload,

                    s->tm4[counter].freq, get_ticks_per_sec());

    new_qemu = now_qemu + muldiv64((uint32_t) (s->tm4[n].tm.value - now_vm),

                    get_ticks_per_sec(), s->tm4[counter].freq);

    qemu_mod_timer(s->tm4[n].tm.qtimer, new_qemu);

}

static uint64_t pxa2xx_timer_read(void *opaque, hwaddr offset,

                                  unsigned size)

{

    PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;

    int tm = 0;

    switch (offset) {

    case OSMR3:  tm ++;

    case OSMR2:  tm ++;

    case OSMR1:  tm ++;

    case OSMR0:

        return s->timer[tm].value;

    case OSMR11: tm ++;

    case OSMR10: tm ++;

    case OSMR9:  tm ++;

    case OSMR8:  tm ++;

    case OSMR7:  tm ++;

    case OSMR6:  tm ++;

    case OSMR5:  tm ++;

    case OSMR4:

        if (!pxa2xx_timer_has_tm4(s))

            goto badreg;

        return s->tm4[tm].tm.value;

    case OSCR:

        return s->clock + muldiv64(qemu_get_clock_ns(vm_clock) -

                        s->lastload, s->freq, get_ticks_per_sec());

    case OSCR11: tm ++;

    case OSCR10: tm ++;

    case OSCR9:  tm ++;

    case OSCR8:  tm ++;

    case OSCR7:  tm ++;

    case OSCR6:  tm ++;

    case OSCR5:  tm ++;

    case OSCR4:

        if (!pxa2xx_timer_has_tm4(s))

            goto badreg;

        if ((tm == 9 - 4 || tm == 11 - 4) && (s->tm4[tm].control & (1 << 9))) {

            if (s->tm4[tm - 1].freq)

                s->snapshot = s->tm4[tm - 1].clock + muldiv64(

                                qemu_get_clock_ns(vm_clock) -

                                s->tm4[tm - 1].lastload,

                                s->tm4[tm - 1].freq, get_ticks_per_sec());

            else

                s->snapshot = s->tm4[tm - 1].clock;

        }

        if (!s->tm4[tm].freq)

            return s->tm4[tm].clock;

        return s->tm4[tm].clock + muldiv64(qemu_get_clock_ns(vm_clock) -

                        s->tm4[tm].lastload, s->tm4[tm].freq, get_ticks_per_sec());

    case OIER:

        return s->irq_enabled;

    case OSSR:        /* Status register */

        return s->events;

    case OWER:

        return s->reset3;

    case OMCR11: tm ++;

    case OMCR10: tm ++;

    case OMCR9:  tm ++;

    case OMCR8:  tm ++;

    case OMCR7:  tm ++;

    case OMCR6:  tm ++;

    case OMCR5:  tm ++;

    case OMCR4:

        if (!pxa2xx_timer_has_tm4(s))

            goto badreg;

        return s->tm4[tm].control;

    case OSNR:

        return s->snapshot;

    default:

    badreg:

        hw_error("pxa2xx_timer_read: Bad offset " REG_FMT "\n", offset);

    }

    return 0;

}

static void pxa2xx_timer_write(void *opaque, hwaddr offset,

                               uint64_t value, unsigned size)

{

    int i, tm = 0;

    PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;

    switch (offset) {

    case OSMR3:  tm ++;

    case OSMR2:  tm ++;

    case OSMR1:  tm ++;

    case OSMR0:

        s->timer[tm].value = value;

        pxa2xx_timer_update(s, qemu_get_clock_ns(vm_clock));

        break;

    case OSMR11: tm ++;

    case OSMR10: tm ++;

    case OSMR9:  tm ++;

    case OSMR8:  tm ++;

    case OSMR7:  tm ++;

    case OSMR6:  tm ++;

    case OSMR5:  tm ++;

    case OSMR4:

        if (!pxa2xx_timer_has_tm4(s))

            goto badreg;

        s->tm4[tm].tm.value = value;

        pxa2xx_timer_update4(s, qemu_get_clock_ns(vm_clock), tm);

        break;

    case OSCR:

        s->oldclock = s->clock;

        s->lastload = qemu_get_clock_ns(vm_clock);

        s->clock = value;

        pxa2xx_timer_update(s, s->lastload);

        break;

    case OSCR11: tm ++;

    case OSCR10: tm ++;

    case OSCR9:  tm ++;

    case OSCR8:  tm ++;

    case OSCR7:  tm ++;

    case OSCR6:  tm ++;

    case OSCR5:  tm ++;

    case OSCR4:

        if (!pxa2xx_timer_has_tm4(s))

            goto badreg;

        s->tm4[tm].oldclock = s->tm4[tm].clock;

        s->tm4[tm].lastload = qemu_get_clock_ns(vm_clock);

        s->tm4[tm].clock = value;

        pxa2xx_timer_update4(s, s->tm4[tm].lastload, tm);

        break;

    case OIER:

        s->irq_enabled = value & 0xfff;

        break;

    case OSSR:        /* Status register */

        value &= s->events;

        s->events &= ~value;

        for (i = 0; i < 4; i ++, value >>= 1)

            if (value & 1)

                qemu_irq_lower(s->timer[i].irq);

        if (pxa2xx_timer_has_tm4(s) && !(s->events & 0xff0) && value)

            qemu_irq_lower(s->irq4);

        break;

    case OWER:        /* XXX: Reset on OSMR3 match? */

        s->reset3 = value;

        break;

    case OMCR7:  tm ++;

    case OMCR6:  tm ++;

    case OMCR5:  tm ++;

    case OMCR4:

        if (!pxa2xx_timer_has_tm4(s))

            goto badreg;

        s->tm4[tm].control = value & 0x0ff;

        /* XXX Stop if running (shouldn't happen) */

        if ((value & (1 << 7)) || tm == 0)

            s->tm4[tm].freq = pxa2xx_timer4_freq[value & 7];

        else {

            s->tm4[tm].freq = 0;

            pxa2xx_timer_update4(s, qemu_get_clock_ns(vm_clock), tm);

        }

        break;

    case OMCR11: tm ++;

    case OMCR10: tm ++;

    case OMCR9:  tm ++;

    case OMCR8:  tm += 4;

        if (!pxa2xx_timer_has_tm4(s))

            goto badreg;

        s->tm4[tm].control = value & 0x3ff;

        /* XXX Stop if running (shouldn't happen) */

        if ((value & (1 << 7)) || !(tm & 1))

            s->tm4[tm].freq =

                    pxa2xx_timer4_freq[(value & (1 << 8)) ?  0 : (value & 7)];

        else {

            s->tm4[tm].freq = 0;

            pxa2xx_timer_update4(s, qemu_get_clock_ns(vm_clock), tm);

        }

        break;

    default:

    badreg:

        hw_error("pxa2xx_timer_write: Bad offset " REG_FMT "\n", offset);

    }

}

static const MemoryRegionOps pxa2xx_timer_ops = {

    .read = pxa2xx_timer_read,

    .write = pxa2xx_timer_write,

    .endianness = DEVICE_NATIVE_ENDIAN,

};

static void pxa2xx_timer_tick(void *opaque)

{

    PXA2xxTimer0 *t = (PXA2xxTimer0 *) opaque;

    PXA2xxTimerInfo *i = t->info;

    if (i->irq_enabled & (1 << t->num)) {

        i->events |= 1 << t->num;

        qemu_irq_raise(t->irq);

    }

    if (t->num == 3)

        if (i->reset3 & 1) {

            i->reset3 = 0;

            qemu_system_reset_request();

        }

}

static void pxa2xx_timer_tick4(void *opaque)

{

    PXA2xxTimer4 *t = (PXA2xxTimer4 *) opaque;

    PXA2xxTimerInfo *i = (PXA2xxTimerInfo *) t->tm.info;

    pxa2xx_timer_tick(&t->tm);

    if (t->control & (1 << 3))

        t->clock = 0;

    if (t->control & (1 << 6))

        pxa2xx_timer_update4(i, qemu_get_clock_ns(vm_clock), t->tm.num - 4);

    if (i->events & 0xff0)

        qemu_irq_raise(i->irq4);

}

static int pxa25x_timer_post_load(void *opaque, int version_id)

{

    PXA2xxTimerInfo *s = (PXA2xxTimerInfo *) opaque;

    int64_t now;

    int i;

    now = qemu_get_clock_ns(vm_clock);

    pxa2xx_timer_update(s, now);

    if (pxa2xx_timer_has_tm4(s))

        for (i = 0; i < 8; i ++)

            pxa2xx_timer_update4(s, now, i);

    return 0;

}

static int pxa2xx_timer_init(SysBusDevice *dev)

{

    int i;

    PXA2xxTimerInfo *s;

    s = FROM_SYSBUS(PXA2xxTimerInfo, dev);

    s->irq_enabled = 0;

    s->oldclock = 0;

    s->clock = 0;

    s->lastload = qemu_get_clock_ns(vm_clock);

    s->reset3 = 0;

    for (i = 0; i < 4; i ++) {

        s->timer[i].value = 0;

        sysbus_init_irq(dev, &s->timer[i].irq);

        s->timer[i].info = s;

        s->timer[i].num = i;

        s->timer[i].qtimer = qemu_new_timer_ns(vm_clock,

                        pxa2xx_timer_tick, &s->timer[i]);

    }

    if (s->flags & (1 << PXA2XX_TIMER_HAVE_TM4)) {

        sysbus_init_irq(dev, &s->irq4);

        for (i = 0; i < 8; i ++) {

            s->tm4[i].tm.value = 0;

            s->tm4[i].tm.info = s;

            s->tm4[i].tm.num = i + 4;

            s->tm4[i].freq = 0;

            s->tm4[i].control = 0x0;

            s->tm4[i].tm.qtimer = qemu_new_timer_ns(vm_clock,

                        pxa2xx_timer_tick4, &s->tm4[i]);

        }

    }

    memory_region_init_io(&s->iomem, &pxa2xx_timer_ops, s,

                          "pxa2xx-timer", 0x00001000);

    sysbus_init_mmio(dev, &s->iomem);

    return 0;

}

static const VMStateDescription vmstate_pxa2xx_timer0_regs = {

    .name = "pxa2xx_timer0",

    .version_id = 2,

    .minimum_version_id = 2,

    .minimum_version_id_old = 2,

    .fields = (VMStateField[]) {

        VMSTATE_UINT32(value, PXA2xxTimer0),

        VMSTATE_END_OF_LIST(),

    },

};

static const VMStateDescription vmstate_pxa2xx_timer4_regs = {

    .name = "pxa2xx_timer4",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .fields = (VMStateField[]) {

        VMSTATE_STRUCT(tm, PXA2xxTimer4, 1,

                        vmstate_pxa2xx_timer0_regs, PXA2xxTimer0),

        VMSTATE_INT32(oldclock, PXA2xxTimer4),

        VMSTATE_INT32(clock, PXA2xxTimer4),

        VMSTATE_UINT64(lastload, PXA2xxTimer4),

        VMSTATE_UINT32(freq, PXA2xxTimer4),

        VMSTATE_UINT32(control, PXA2xxTimer4),

        VMSTATE_END_OF_LIST(),

    },

};

static bool pxa2xx_timer_has_tm4_test(void *opaque, int version_id)

{

    return pxa2xx_timer_has_tm4(opaque);

}

static const VMStateDescription vmstate_pxa2xx_timer_regs = {

    .name = "pxa2xx_timer",

    .version_id = 1,

    .minimum_version_id = 1,

    .minimum_version_id_old = 1,

    .post_load = pxa25x_timer_post_load,

    .fields = (VMStateField[]) {

        VMSTATE_INT32(clock, PXA2xxTimerInfo),

        VMSTATE_INT32(oldclock, PXA2xxTimerInfo),

        VMSTATE_UINT64(lastload, PXA2xxTimerInfo),

        VMSTATE_STRUCT_ARRAY(timer, PXA2xxTimerInfo, 4, 1,

                        vmstate_pxa2xx_timer0_regs, PXA2xxTimer0),

        VMSTATE_UINT32(events, PXA2xxTimerInfo),

        VMSTATE_UINT32(irq_enabled, PXA2xxTimerInfo),

        VMSTATE_UINT32(reset3, PXA2xxTimerInfo),

        VMSTATE_UINT32(snapshot, PXA2xxTimerInfo),

        VMSTATE_STRUCT_ARRAY_TEST(tm4, PXA2xxTimerInfo, 8,

                        pxa2xx_timer_has_tm4_test, 0,

                        vmstate_pxa2xx_timer4_regs, PXA2xxTimer4),

        VMSTATE_END_OF_LIST(),

    }

};

static Property pxa25x_timer_dev_properties[] = {

    DEFINE_PROP_UINT32("freq", PXA2xxTimerInfo, freq, PXA25X_FREQ),

    DEFINE_PROP_BIT("tm4", PXA2xxTimerInfo, flags,

    PXA2XX_TIMER_HAVE_TM4, false),

    DEFINE_PROP_END_OF_LIST(),

};

static void pxa25x_timer_dev_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = pxa2xx_timer_init;

    dc->desc = "PXA25x timer";

    dc->vmsd = &vmstate_pxa2xx_timer_regs;

    dc->props = pxa25x_timer_dev_properties;

}

static TypeInfo pxa25x_timer_dev_info = {

    .name          = "pxa25x-timer",

    .parent        = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(PXA2xxTimerInfo),

    .class_init    = pxa25x_timer_dev_class_init,

};

static Property pxa27x_timer_dev_properties[] = {

    DEFINE_PROP_UINT32("freq", PXA2xxTimerInfo, freq, PXA27X_FREQ),

    DEFINE_PROP_BIT("tm4", PXA2xxTimerInfo, flags,

    PXA2XX_TIMER_HAVE_TM4, true),

    DEFINE_PROP_END_OF_LIST(),

};

static void pxa27x_timer_dev_class_init(ObjectClass *klass, void *data)

{

    DeviceClass *dc = DEVICE_CLASS(klass);

    SysBusDeviceClass *k = SYS_BUS_DEVICE_CLASS(klass);

    k->init = pxa2xx_timer_init;

    dc->desc = "PXA27x timer";

    dc->vmsd = &vmstate_pxa2xx_timer_regs;

    dc->props = pxa27x_timer_dev_properties;

}

static TypeInfo pxa27x_timer_dev_info = {

    .name          = "pxa27x-timer",

    .parent        = TYPE_SYS_BUS_DEVICE,

    .instance_size = sizeof(PXA2xxTimerInfo),

    .class_init    = pxa27x_timer_dev_class_init,

};

static void pxa2xx_timer_register_types(void)

{

    type_register_static(&pxa25x_timer_dev_info);

    type_register_static(&pxa27x_timer_dev_info);

}

type_init(pxa2xx_timer_register_types)