[qemu.git] / hw / timer / allwinner-a10-pit.c

/*
 * Allwinner A10 timer device emulation
 *
 * Copyright (C) 2013 Li Guang
 * Written by Li Guang <[email protected]>
 *
 * 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.
 */

#include "qemu/osdep.h"
#include "hw/sysbus.h"
#include "sysemu/sysemu.h"
#include "hw/timer/allwinner-a10-pit.h"
#include "qemu/log.h"

static void a10_pit_update_irq(AwA10PITState *s)
{
    int i;

    for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
        qemu_set_irq(s->irq[i], !!(s->irq_status & s->irq_enable & (1 << i)));
    }
}

static uint64_t a10_pit_read(void *opaque, hwaddr offset, unsigned size)
{
    AwA10PITState *s = AW_A10_PIT(opaque);
    uint8_t index;

    switch (offset) {
    case AW_A10_PIT_TIMER_IRQ_EN:
        return s->irq_enable;
    case AW_A10_PIT_TIMER_IRQ_ST:
        return s->irq_status;
    case AW_A10_PIT_TIMER_BASE ... AW_A10_PIT_TIMER_BASE_END:
        index = offset & 0xf0;
        index >>= 4;
        index -= 1;
        switch (offset & 0x0f) {
        case AW_A10_PIT_TIMER_CONTROL:
            return s->control[index];
        case AW_A10_PIT_TIMER_INTERVAL:
            return s->interval[index];
        case AW_A10_PIT_TIMER_COUNT:
            s->count[index] = ptimer_get_count(s->timer[index]);
            return s->count[index];
        default:
            qemu_log_mask(LOG_GUEST_ERROR,
                          "%s: Bad offset 0x%x\n",  __func__, (int)offset);
            break;
        }
    case AW_A10_PIT_WDOG_CONTROL:
        break;
    case AW_A10_PIT_WDOG_MODE:
        break;
    case AW_A10_PIT_COUNT_LO:
        return s->count_lo;
    case AW_A10_PIT_COUNT_HI:
        return s->count_hi;
    case AW_A10_PIT_COUNT_CTL:
        return s->count_ctl;
    default:
        qemu_log_mask(LOG_GUEST_ERROR,
                      "%s: Bad offset 0x%x\n",  __func__, (int)offset);
        break;
    }

    return 0;
}

static void a10_pit_set_freq(AwA10PITState *s, int index)
{
    uint32_t prescaler, source, source_freq;

    prescaler = 1 << extract32(s->control[index], 4, 3);
    source = extract32(s->control[index], 2, 2);
    source_freq = s->clk_freq[source];

    if (source_freq) {
        ptimer_set_freq(s->timer[index], source_freq / prescaler);
    } else {
        qemu_log_mask(LOG_GUEST_ERROR, "%s: Invalid clock source %u\n",
                      __func__, source);
    }
}

static void a10_pit_write(void *opaque, hwaddr offset, uint64_t value,
                            unsigned size)
{
     AwA10PITState *s = AW_A10_PIT(opaque);
     uint8_t index;

    switch (offset) {
    case AW_A10_PIT_TIMER_IRQ_EN:
        s->irq_enable = value;
        a10_pit_update_irq(s);
        break;
    case AW_A10_PIT_TIMER_IRQ_ST:
        s->irq_status &= ~value;
        a10_pit_update_irq(s);
        break;
    case AW_A10_PIT_TIMER_BASE ... AW_A10_PIT_TIMER_BASE_END:
        index = offset & 0xf0;
        index >>= 4;
        index -= 1;
        switch (offset & 0x0f) {
        case AW_A10_PIT_TIMER_CONTROL:
            s->control[index] = value;
            a10_pit_set_freq(s, index);
            if (s->control[index] & AW_A10_PIT_TIMER_RELOAD) {
                ptimer_set_count(s->timer[index], s->interval[index]);
            }
            if (s->control[index] & AW_A10_PIT_TIMER_EN) {
                int oneshot = 0;
                if (s->control[index] & AW_A10_PIT_TIMER_MODE) {
                    oneshot = 1;
                }
                ptimer_run(s->timer[index], oneshot);
            } else {
                ptimer_stop(s->timer[index]);
            }
            break;
        case AW_A10_PIT_TIMER_INTERVAL:
            s->interval[index] = value;
            ptimer_set_limit(s->timer[index], s->interval[index], 1);
            break;
        case AW_A10_PIT_TIMER_COUNT:
            s->count[index] = value;
            break;
        default:
            qemu_log_mask(LOG_GUEST_ERROR,
                          "%s: Bad offset 0x%x\n",  __func__, (int)offset);
        }
        break;
    case AW_A10_PIT_WDOG_CONTROL:
        s->watch_dog_control = value;
        break;
    case AW_A10_PIT_WDOG_MODE:
        s->watch_dog_mode = value;
        break;
    case AW_A10_PIT_COUNT_LO:
        s->count_lo = value;
        break;
    case AW_A10_PIT_COUNT_HI:
        s->count_hi = value;
        break;
    case AW_A10_PIT_COUNT_CTL:
        s->count_ctl = value;
        if (s->count_ctl & AW_A10_PIT_COUNT_RL_EN) {
            uint64_t  tmp_count = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);

            s->count_lo = tmp_count;
            s->count_hi = tmp_count >> 32;
            s->count_ctl &= ~AW_A10_PIT_COUNT_RL_EN;
        }
        if (s->count_ctl & AW_A10_PIT_COUNT_CLR_EN) {
            s->count_lo = 0;
            s->count_hi = 0;
            s->count_ctl &= ~AW_A10_PIT_COUNT_CLR_EN;
        }
        break;
    default:
        qemu_log_mask(LOG_GUEST_ERROR,
                      "%s: Bad offset 0x%x\n",  __func__, (int)offset);
        break;
    }
}

static const MemoryRegionOps a10_pit_ops = {
    .read = a10_pit_read,
    .write = a10_pit_write,
    .endianness = DEVICE_NATIVE_ENDIAN,
};

static Property a10_pit_properties[] = {
    DEFINE_PROP_UINT32("clk0-freq", AwA10PITState, clk_freq[0], 0),
    DEFINE_PROP_UINT32("clk1-freq", AwA10PITState, clk_freq[1], 0),
    DEFINE_PROP_UINT32("clk2-freq", AwA10PITState, clk_freq[2], 0),
    DEFINE_PROP_UINT32("clk3-freq", AwA10PITState, clk_freq[3], 0),
    DEFINE_PROP_END_OF_LIST(),
};

static const VMStateDescription vmstate_a10_pit = {
    .name = "a10.pit",
    .version_id = 1,
    .minimum_version_id = 1,
    .fields = (VMStateField[]) {
        VMSTATE_UINT32(irq_enable, AwA10PITState),
        VMSTATE_UINT32(irq_status, AwA10PITState),
        VMSTATE_UINT32_ARRAY(control, AwA10PITState, AW_A10_PIT_TIMER_NR),
        VMSTATE_UINT32_ARRAY(interval, AwA10PITState, AW_A10_PIT_TIMER_NR),
        VMSTATE_UINT32_ARRAY(count, AwA10PITState, AW_A10_PIT_TIMER_NR),
        VMSTATE_UINT32(watch_dog_mode, AwA10PITState),
        VMSTATE_UINT32(watch_dog_control, AwA10PITState),
        VMSTATE_UINT32(count_lo, AwA10PITState),
        VMSTATE_UINT32(count_hi, AwA10PITState),
        VMSTATE_UINT32(count_ctl, AwA10PITState),
        VMSTATE_PTIMER_ARRAY(timer, AwA10PITState, AW_A10_PIT_TIMER_NR),
        VMSTATE_END_OF_LIST()
    }
};

static void a10_pit_reset(DeviceState *dev)
{
    AwA10PITState *s = AW_A10_PIT(dev);
    uint8_t i;

    s->irq_enable = 0;
    s->irq_status = 0;
    a10_pit_update_irq(s);

    for (i = 0; i < 6; i++) {
        s->control[i] = AW_A10_PIT_DEFAULT_CLOCK;
        s->interval[i] = 0;
        s->count[i] = 0;
        ptimer_stop(s->timer[i]);
        a10_pit_set_freq(s, i);
    }
    s->watch_dog_mode = 0;
    s->watch_dog_control = 0;
    s->count_lo = 0;
    s->count_hi = 0;
    s->count_ctl = 0;
}

static void a10_pit_timer_cb(void *opaque)
{
    AwA10TimerContext *tc = opaque;
    AwA10PITState *s = tc->container;
    uint8_t i = tc->index;

    if (s->control[i] & AW_A10_PIT_TIMER_EN) {
        s->irq_status |= 1 << i;
        if (s->control[i] & AW_A10_PIT_TIMER_MODE) {
            ptimer_stop(s->timer[i]);
            s->control[i] &= ~AW_A10_PIT_TIMER_EN;
        }
        a10_pit_update_irq(s);
    }
}

static void a10_pit_init(Object *obj)
{
    AwA10PITState *s = AW_A10_PIT(obj);
    SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
    QEMUBH * bh[AW_A10_PIT_TIMER_NR];
    uint8_t i;

    for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
        sysbus_init_irq(sbd, &s->irq[i]);
    }
    memory_region_init_io(&s->iomem, OBJECT(s), &a10_pit_ops, s,
                          TYPE_AW_A10_PIT, 0x400);
    sysbus_init_mmio(sbd, &s->iomem);

    for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
        AwA10TimerContext *tc = &s->timer_context[i];

        tc->container = s;
        tc->index = i;
        bh[i] = qemu_bh_new(a10_pit_timer_cb, tc);
        s->timer[i] = ptimer_init(bh[i], PTIMER_POLICY_DEFAULT);
    }
}

static void a10_pit_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);

    dc->reset = a10_pit_reset;
    dc->props = a10_pit_properties;
    dc->desc = "allwinner a10 timer";
    dc->vmsd = &vmstate_a10_pit;
}

static const TypeInfo a10_pit_info = {
    .name = TYPE_AW_A10_PIT,
    .parent = TYPE_SYS_BUS_DEVICE,
    .instance_size = sizeof(AwA10PITState),
    .instance_init = a10_pit_init,
    .class_init = a10_pit_class_init,
};

static void a10_register_types(void)
{
    type_register_static(&a10_pit_info);
}

type_init(a10_register_types);
Commit	Line	Data
3589de8c LG	1	/*
	2	* Allwinner A10 timer device emulation
	3	*
	4	* Copyright (C) 2013 Li Guang
	5	* Written by Li Guang <[email protected]>
	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful, but WITHOUT
	13	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	14	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	15	* for more details.
	16	*/
	17
8ef94f0b	18	#include "qemu/osdep.h"
3589de8c LG	19	#include "hw/sysbus.h"
	20	#include "sysemu/sysemu.h"
	21	#include "hw/timer/allwinner-a10-pit.h"
03dd024f	22	#include "qemu/log.h"
3589de8c	23
a63f9f85 BG	24	static void a10_pit_update_irq(AwA10PITState *s)
	25	{
	26	int i;
	27
	28	for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
	29	qemu_set_irq(s->irq[i], !!(s->irq_status & s->irq_enable & (1 << i)));
	30	}
	31	}
	32
3589de8c LG	33	static uint64_t a10_pit_read(void *opaque, hwaddr offset, unsigned size)
	34	{
	35	AwA10PITState *s = AW_A10_PIT(opaque);
	36	uint8_t index;
	37
	38	switch (offset) {
	39	case AW_A10_PIT_TIMER_IRQ_EN:
	40	return s->irq_enable;
	41	case AW_A10_PIT_TIMER_IRQ_ST:
	42	return s->irq_status;
	43	case AW_A10_PIT_TIMER_BASE ... AW_A10_PIT_TIMER_BASE_END:
	44	index = offset & 0xf0;
	45	index >>= 4;
	46	index -= 1;
	47	switch (offset & 0x0f) {
	48	case AW_A10_PIT_TIMER_CONTROL:
	49	return s->control[index];
	50	case AW_A10_PIT_TIMER_INTERVAL:
	51	return s->interval[index];
	52	case AW_A10_PIT_TIMER_COUNT:
	53	s->count[index] = ptimer_get_count(s->timer[index]);
	54	return s->count[index];
	55	default:
	56	qemu_log_mask(LOG_GUEST_ERROR,
	57	"%s: Bad offset 0x%x\n", __func__, (int)offset);
	58	break;
	59	}
	60	case AW_A10_PIT_WDOG_CONTROL:
	61	break;
	62	case AW_A10_PIT_WDOG_MODE:
	63	break;
	64	case AW_A10_PIT_COUNT_LO:
	65	return s->count_lo;
	66	case AW_A10_PIT_COUNT_HI:
	67	return s->count_hi;
	68	case AW_A10_PIT_COUNT_CTL:
	69	return s->count_ctl;
	70	default:
	71	qemu_log_mask(LOG_GUEST_ERROR,
	72	"%s: Bad offset 0x%x\n", __func__, (int)offset);
	73	break;
	74	}
	75
	76	return 0;
	77	}
	78
286226a4 BG	79	static void a10_pit_set_freq(AwA10PITState *s, int index)
	80	{
	81	uint32_t prescaler, source, source_freq;
	82
	83	prescaler = 1 << extract32(s->control[index], 4, 3);
	84	source = extract32(s->control[index], 2, 2);
	85	source_freq = s->clk_freq[source];
	86
	87	if (source_freq) {
	88	ptimer_set_freq(s->timer[index], source_freq / prescaler);
	89	} else {
	90	qemu_log_mask(LOG_GUEST_ERROR, "%s: Invalid clock source %u\n",
	91	__func__, source);
	92	}
	93	}
	94
3589de8c LG	95	static void a10_pit_write(void *opaque, hwaddr offset, uint64_t value,
	96	unsigned size)
	97	{
	98	AwA10PITState *s = AW_A10_PIT(opaque);
	99	uint8_t index;
	100
	101	switch (offset) {
	102	case AW_A10_PIT_TIMER_IRQ_EN:
	103	s->irq_enable = value;
a63f9f85	104	a10_pit_update_irq(s);
3589de8c LG	105	break;
	106	case AW_A10_PIT_TIMER_IRQ_ST:
	107	s->irq_status &= ~value;
a63f9f85	108	a10_pit_update_irq(s);
3589de8c LG	109	break;
	110	case AW_A10_PIT_TIMER_BASE ... AW_A10_PIT_TIMER_BASE_END:
	111	index = offset & 0xf0;
	112	index >>= 4;
	113	index -= 1;
	114	switch (offset & 0x0f) {
	115	case AW_A10_PIT_TIMER_CONTROL:
	116	s->control[index] = value;
286226a4	117	a10_pit_set_freq(s, index);
3589de8c LG	118	if (s->control[index] & AW_A10_PIT_TIMER_RELOAD) {
	119	ptimer_set_count(s->timer[index], s->interval[index]);
	120	}
	121	if (s->control[index] & AW_A10_PIT_TIMER_EN) {
	122	int oneshot = 0;
	123	if (s->control[index] & AW_A10_PIT_TIMER_MODE) {
	124	oneshot = 1;
	125	}
	126	ptimer_run(s->timer[index], oneshot);
	127	} else {
	128	ptimer_stop(s->timer[index]);
	129	}
	130	break;
	131	case AW_A10_PIT_TIMER_INTERVAL:
	132	s->interval[index] = value;
	133	ptimer_set_limit(s->timer[index], s->interval[index], 1);
	134	break;
	135	case AW_A10_PIT_TIMER_COUNT:
	136	s->count[index] = value;
	137	break;
	138	default:
	139	qemu_log_mask(LOG_GUEST_ERROR,
	140	"%s: Bad offset 0x%x\n", __func__, (int)offset);
	141	}
	142	break;
	143	case AW_A10_PIT_WDOG_CONTROL:
	144	s->watch_dog_control = value;
	145	break;
	146	case AW_A10_PIT_WDOG_MODE:
	147	s->watch_dog_mode = value;
	148	break;
	149	case AW_A10_PIT_COUNT_LO:
	150	s->count_lo = value;
	151	break;
	152	case AW_A10_PIT_COUNT_HI:
	153	s->count_hi = value;
	154	break;
	155	case AW_A10_PIT_COUNT_CTL:
	156	s->count_ctl = value;
	157	if (s->count_ctl & AW_A10_PIT_COUNT_RL_EN) {
	158	uint64_t tmp_count = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
	159
	160	s->count_lo = tmp_count;
	161	s->count_hi = tmp_count >> 32;
	162	s->count_ctl &= ~AW_A10_PIT_COUNT_RL_EN;
	163	}
	164	if (s->count_ctl & AW_A10_PIT_COUNT_CLR_EN) {
	165	s->count_lo = 0;
	166	s->count_hi = 0;
	167	s->count_ctl &= ~AW_A10_PIT_COUNT_CLR_EN;
	168	}
	169	break;
	170	default:
	171	qemu_log_mask(LOG_GUEST_ERROR,
	172	"%s: Bad offset 0x%x\n", __func__, (int)offset);
	173	break;
	174	}
	175	}
	176
	177	static const MemoryRegionOps a10_pit_ops = {
	178	.read = a10_pit_read,
	179	.write = a10_pit_write,
	180	.endianness = DEVICE_NATIVE_ENDIAN,
	181	};
182
286226a4 BG	183	static Property a10_pit_properties[] = {
	184	DEFINE_PROP_UINT32("clk0-freq", AwA10PITState, clk_freq[0], 0),
	185	DEFINE_PROP_UINT32("clk1-freq", AwA10PITState, clk_freq[1], 0),
	186	DEFINE_PROP_UINT32("clk2-freq", AwA10PITState, clk_freq[2], 0),
	187	DEFINE_PROP_UINT32("clk3-freq", AwA10PITState, clk_freq[3], 0),
	188	DEFINE_PROP_END_OF_LIST(),
	189	};
	190
3589de8c LG	191	static const VMStateDescription vmstate_a10_pit = {
	192	.name = "a10.pit",
	193	.version_id = 1,
	194	.minimum_version_id = 1,
3589de8c LG	195	.fields = (VMStateField[]) {
	196	VMSTATE_UINT32(irq_enable, AwA10PITState),
	197	VMSTATE_UINT32(irq_status, AwA10PITState),
	198	VMSTATE_UINT32_ARRAY(control, AwA10PITState, AW_A10_PIT_TIMER_NR),
	199	VMSTATE_UINT32_ARRAY(interval, AwA10PITState, AW_A10_PIT_TIMER_NR),
	200	VMSTATE_UINT32_ARRAY(count, AwA10PITState, AW_A10_PIT_TIMER_NR),
	201	VMSTATE_UINT32(watch_dog_mode, AwA10PITState),
	202	VMSTATE_UINT32(watch_dog_control, AwA10PITState),
	203	VMSTATE_UINT32(count_lo, AwA10PITState),
	204	VMSTATE_UINT32(count_hi, AwA10PITState),
	205	VMSTATE_UINT32(count_ctl, AwA10PITState),
	206	VMSTATE_PTIMER_ARRAY(timer, AwA10PITState, AW_A10_PIT_TIMER_NR),
	207	VMSTATE_END_OF_LIST()
	208	}
	209	};
	210
	211	static void a10_pit_reset(DeviceState *dev)
	212	{
	213	AwA10PITState *s = AW_A10_PIT(dev);
	214	uint8_t i;
	215
	216	s->irq_enable = 0;
	217	s->irq_status = 0;
a63f9f85 BG	218	a10_pit_update_irq(s);
a63f9f85 BG	219
3589de8c LG	220	for (i = 0; i < 6; i++) {
	221	s->control[i] = AW_A10_PIT_DEFAULT_CLOCK;
	222	s->interval[i] = 0;
	223	s->count[i] = 0;
	224	ptimer_stop(s->timer[i]);
286226a4	225	a10_pit_set_freq(s, i);
3589de8c LG	226	}
	227	s->watch_dog_mode = 0;
	228	s->watch_dog_control = 0;
	229	s->count_lo = 0;
	230	s->count_hi = 0;
	231	s->count_ctl = 0;
	232	}
	233
	234	static void a10_pit_timer_cb(void *opaque)
	235	{
323a8771 BG	236	AwA10TimerContext *tc = opaque;
	237	AwA10PITState *s = tc->container;
	238	uint8_t i = tc->index;
3589de8c	239
323a8771 BG	240	if (s->control[i] & AW_A10_PIT_TIMER_EN) {
	241	s->irq_status \|= 1 << i;
	242	if (s->control[i] & AW_A10_PIT_TIMER_MODE) {
	243	ptimer_stop(s->timer[i]);
	244	s->control[i] &= ~AW_A10_PIT_TIMER_EN;
3589de8c	245	}
a63f9f85	246	a10_pit_update_irq(s);
3589de8c LG	247	}
	248	}
	249
	250	static void a10_pit_init(Object *obj)
	251	{
	252	AwA10PITState *s = AW_A10_PIT(obj);
	253	SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
	254	QEMUBH * bh[AW_A10_PIT_TIMER_NR];
	255	uint8_t i;
	256
	257	for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
	258	sysbus_init_irq(sbd, &s->irq[i]);
	259	}
	260	memory_region_init_io(&s->iomem, OBJECT(s), &a10_pit_ops, s,
	261	TYPE_AW_A10_PIT, 0x400);
	262	sysbus_init_mmio(sbd, &s->iomem);
	263
	264	for (i = 0; i < AW_A10_PIT_TIMER_NR; i++) {
323a8771 BG	265	AwA10TimerContext *tc = &s->timer_context[i];
	266
	267	tc->container = s;
	268	tc->index = i;
	269	bh[i] = qemu_bh_new(a10_pit_timer_cb, tc);
e7ea81c3	270	s->timer[i] = ptimer_init(bh[i], PTIMER_POLICY_DEFAULT);
3589de8c LG	271	}
	272	}
	273
	274	static void a10_pit_class_init(ObjectClass klass, void data)
	275	{
	276	DeviceClass *dc = DEVICE_CLASS(klass);
	277
	278	dc->reset = a10_pit_reset;
286226a4	279	dc->props = a10_pit_properties;
3589de8c LG	280	dc->desc = "allwinner a10 timer";
	281	dc->vmsd = &vmstate_a10_pit;
	282	}
	283
	284	static const TypeInfo a10_pit_info = {
	285	.name = TYPE_AW_A10_PIT,
	286	.parent = TYPE_SYS_BUS_DEVICE,
	287	.instance_size = sizeof(AwA10PITState),
	288	.instance_init = a10_pit_init,
	289	.class_init = a10_pit_class_init,
	290	};
	291
	292	static void a10_register_types(void)
	293	{
	294	type_register_static(&a10_pit_info);
	295	}
	296
	297	type_init(a10_register_types);