[mirror_qemu.git] / hw / watchdog / wdt_aspeed.c

/*
 * ASPEED Watchdog Controller
 *
 * Copyright (C) 2016-2017 IBM Corp.
 *
 * This code is licensed under the GPL version 2 or later. See the
 * COPYING file in the top-level directory.
 */

#include "qemu/osdep.h"

#include "qapi/error.h"
#include "qemu/log.h"
#include "qemu/module.h"
#include "qemu/timer.h"
#include "sysemu/watchdog.h"
#include "hw/misc/aspeed_scu.h"
#include "hw/qdev-properties.h"
#include "hw/sysbus.h"
#include "hw/watchdog/wdt_aspeed.h"
#include "migration/vmstate.h"
#include "trace.h"

#define WDT_STATUS                      (0x00 / 4)
#define WDT_RELOAD_VALUE                (0x04 / 4)
#define WDT_RESTART                     (0x08 / 4)
#define WDT_CTRL                        (0x0C / 4)
#define   WDT_CTRL_RESET_MODE_SOC       (0x00 << 5)
#define   WDT_CTRL_RESET_MODE_FULL_CHIP (0x01 << 5)
#define   WDT_CTRL_1MHZ_CLK             BIT(4)
#define   WDT_CTRL_WDT_EXT              BIT(3)
#define   WDT_CTRL_WDT_INTR             BIT(2)
#define   WDT_CTRL_RESET_SYSTEM         BIT(1)
#define   WDT_CTRL_ENABLE               BIT(0)
#define WDT_RESET_WIDTH                 (0x18 / 4)
#define   WDT_RESET_WIDTH_ACTIVE_HIGH   BIT(31)
#define     WDT_POLARITY_MASK           (0xFF << 24)
#define     WDT_ACTIVE_HIGH_MAGIC       (0xA5 << 24)
#define     WDT_ACTIVE_LOW_MAGIC        (0x5A << 24)
#define   WDT_RESET_WIDTH_PUSH_PULL     BIT(30)
#define     WDT_DRIVE_TYPE_MASK         (0xFF << 24)
#define     WDT_PUSH_PULL_MAGIC         (0xA8 << 24)
#define     WDT_OPEN_DRAIN_MAGIC        (0x8A << 24)
#define WDT_RESET_MASK1                 (0x1c / 4)

#define WDT_TIMEOUT_STATUS              (0x10 / 4)
#define WDT_TIMEOUT_CLEAR               (0x14 / 4)

#define WDT_RESTART_MAGIC               0x4755

#define AST2600_SCU_RESET_CONTROL1      (0x40 / 4)
#define SCU_RESET_CONTROL1              (0x04 / 4)
#define    SCU_RESET_SDRAM              BIT(0)

static bool aspeed_wdt_is_enabled(const AspeedWDTState *s)
{
    return s->regs[WDT_CTRL] & WDT_CTRL_ENABLE;
}

static uint64_t aspeed_wdt_read(void *opaque, hwaddr offset, unsigned size)
{
    AspeedWDTState *s = ASPEED_WDT(opaque);

    trace_aspeed_wdt_read(offset, size);

    offset >>= 2;

    switch (offset) {
    case WDT_STATUS:
        return s->regs[WDT_STATUS];
    case WDT_RELOAD_VALUE:
        return s->regs[WDT_RELOAD_VALUE];
    case WDT_RESTART:
        qemu_log_mask(LOG_GUEST_ERROR,
                      "%s: read from write-only reg at offset 0x%"
                      HWADDR_PRIx "\n", __func__, offset);
        return 0;
    case WDT_CTRL:
        return s->regs[WDT_CTRL];
    case WDT_RESET_WIDTH:
        return s->regs[WDT_RESET_WIDTH];
    case WDT_RESET_MASK1:
        return s->regs[WDT_RESET_MASK1];
    case WDT_TIMEOUT_STATUS:
    case WDT_TIMEOUT_CLEAR:
        qemu_log_mask(LOG_UNIMP,
                      "%s: uninmplemented read at offset 0x%" HWADDR_PRIx "\n",
                      __func__, offset);
        return 0;
    default:
        qemu_log_mask(LOG_GUEST_ERROR,
                      "%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n",
                      __func__, offset);
        return 0;
    }

}

static void aspeed_wdt_reload(AspeedWDTState *s)
{
    uint64_t reload;

    if (!(s->regs[WDT_CTRL] & WDT_CTRL_1MHZ_CLK)) {
        reload = muldiv64(s->regs[WDT_RELOAD_VALUE], NANOSECONDS_PER_SECOND,
                          s->pclk_freq);
    } else {
        reload = s->regs[WDT_RELOAD_VALUE] * 1000ULL;
    }

    if (aspeed_wdt_is_enabled(s)) {
        timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + reload);
    }
}

static void aspeed_wdt_reload_1mhz(AspeedWDTState *s)
{
    uint64_t reload = s->regs[WDT_RELOAD_VALUE] * 1000ULL;

    if (aspeed_wdt_is_enabled(s)) {
        timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + reload);
    }
}

static uint64_t aspeed_2400_sanitize_ctrl(uint64_t data)
{
    return data & 0xffff;
}

static uint64_t aspeed_2500_sanitize_ctrl(uint64_t data)
{
    return (data & ~(0xfUL << 8)) | WDT_CTRL_1MHZ_CLK;
}

static uint64_t aspeed_2600_sanitize_ctrl(uint64_t data)
{
    return data & ~(0x7UL << 7);
}

static void aspeed_wdt_write(void *opaque, hwaddr offset, uint64_t data,
                             unsigned size)
{
    AspeedWDTState *s = ASPEED_WDT(opaque);
    AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(s);
    bool enable;

    trace_aspeed_wdt_write(offset, size, data);

    offset >>= 2;

    switch (offset) {
    case WDT_STATUS:
        qemu_log_mask(LOG_GUEST_ERROR,
                      "%s: write to read-only reg at offset 0x%"
                      HWADDR_PRIx "\n", __func__, offset);
        break;
    case WDT_RELOAD_VALUE:
        s->regs[WDT_RELOAD_VALUE] = data;
        break;
    case WDT_RESTART:
        if ((data & 0xFFFF) == WDT_RESTART_MAGIC) {
            s->regs[WDT_STATUS] = s->regs[WDT_RELOAD_VALUE];
            awc->wdt_reload(s);
        }
        break;
    case WDT_CTRL:
        data = awc->sanitize_ctrl(data);
        enable = data & WDT_CTRL_ENABLE;
        if (enable && !aspeed_wdt_is_enabled(s)) {
            s->regs[WDT_CTRL] = data;
            awc->wdt_reload(s);
        } else if (!enable && aspeed_wdt_is_enabled(s)) {
            s->regs[WDT_CTRL] = data;
            timer_del(s->timer);
        } else {
            s->regs[WDT_CTRL] = data;
        }
        break;
    case WDT_RESET_WIDTH:
        if (awc->reset_pulse) {
            awc->reset_pulse(s, data & WDT_POLARITY_MASK);
        }
        s->regs[WDT_RESET_WIDTH] &= ~awc->ext_pulse_width_mask;
        s->regs[WDT_RESET_WIDTH] |= data & awc->ext_pulse_width_mask;
        break;

    case WDT_RESET_MASK1:
        /* TODO: implement */
        s->regs[WDT_RESET_MASK1] = data;
        break;

    case WDT_TIMEOUT_STATUS:
    case WDT_TIMEOUT_CLEAR:
        qemu_log_mask(LOG_UNIMP,
                      "%s: uninmplemented write at offset 0x%" HWADDR_PRIx "\n",
                      __func__, offset);
        break;
    default:
        qemu_log_mask(LOG_GUEST_ERROR,
                      "%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n",
                      __func__, offset);
    }
    return;
}

static const VMStateDescription vmstate_aspeed_wdt = {
    .name = "vmstate_aspeed_wdt",
    .version_id = 0,
    .minimum_version_id = 0,
    .fields = (VMStateField[]) {
        VMSTATE_TIMER_PTR(timer, AspeedWDTState),
        VMSTATE_UINT32_ARRAY(regs, AspeedWDTState, ASPEED_WDT_REGS_MAX),
        VMSTATE_END_OF_LIST()
    }
};

static const MemoryRegionOps aspeed_wdt_ops = {
    .read = aspeed_wdt_read,
    .write = aspeed_wdt_write,
    .endianness = DEVICE_LITTLE_ENDIAN,
    .valid.min_access_size = 4,
    .valid.max_access_size = 4,
    .valid.unaligned = false,
};

static void aspeed_wdt_reset(DeviceState *dev)
{
    AspeedWDTState *s = ASPEED_WDT(dev);
    AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(s);

    s->regs[WDT_STATUS] = awc->default_status;
    s->regs[WDT_RELOAD_VALUE] = awc->default_reload_value;
    s->regs[WDT_RESTART] = 0;
    s->regs[WDT_CTRL] = awc->sanitize_ctrl(0);
    s->regs[WDT_RESET_WIDTH] = 0xFF;

    timer_del(s->timer);
}

static void aspeed_wdt_timer_expired(void *dev)
{
    AspeedWDTState *s = ASPEED_WDT(dev);
    uint32_t reset_ctrl_reg = ASPEED_WDT_GET_CLASS(s)->reset_ctrl_reg;

    /* Do not reset on SDRAM controller reset */
    if (s->scu->regs[reset_ctrl_reg] & SCU_RESET_SDRAM) {
        timer_del(s->timer);
        s->regs[WDT_CTRL] = 0;
        return;
    }

    qemu_log_mask(CPU_LOG_RESET, "Watchdog timer %" HWADDR_PRIx " expired.\n",
                  s->iomem.addr);
    watchdog_perform_action();
    timer_del(s->timer);
}

#define PCLK_HZ 24000000

static void aspeed_wdt_realize(DeviceState *dev, Error **errp)
{
    SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
    AspeedWDTState *s = ASPEED_WDT(dev);

    assert(s->scu);

    s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, aspeed_wdt_timer_expired, dev);

    /* FIXME: This setting should be derived from the SCU hw strapping
     * register SCU70
     */
    s->pclk_freq = PCLK_HZ;

    memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_wdt_ops, s,
                          TYPE_ASPEED_WDT, ASPEED_WDT_REGS_MAX * 4);
    sysbus_init_mmio(sbd, &s->iomem);
}

static Property aspeed_wdt_properties[] = {
    DEFINE_PROP_LINK("scu", AspeedWDTState, scu, TYPE_ASPEED_SCU,
                     AspeedSCUState *),
    DEFINE_PROP_END_OF_LIST(),
};

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

    dc->desc = "ASPEED Watchdog Controller";
    dc->realize = aspeed_wdt_realize;
    dc->reset = aspeed_wdt_reset;
    set_bit(DEVICE_CATEGORY_WATCHDOG, dc->categories);
    dc->vmsd = &vmstate_aspeed_wdt;
    device_class_set_props(dc, aspeed_wdt_properties);
    dc->desc = "Aspeed watchdog device";
}

static const TypeInfo aspeed_wdt_info = {
    .parent = TYPE_SYS_BUS_DEVICE,
    .name  = TYPE_ASPEED_WDT,
    .instance_size  = sizeof(AspeedWDTState),
    .class_init = aspeed_wdt_class_init,
    .class_size    = sizeof(AspeedWDTClass),
    .abstract      = true,
};

static void aspeed_2400_wdt_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass);

    dc->desc = "ASPEED 2400 Watchdog Controller";
    awc->offset = 0x20;
    awc->ext_pulse_width_mask = 0xff;
    awc->reset_ctrl_reg = SCU_RESET_CONTROL1;
    awc->wdt_reload = aspeed_wdt_reload;
    awc->sanitize_ctrl = aspeed_2400_sanitize_ctrl;
    awc->default_status = 0x03EF1480;
    awc->default_reload_value = 0x03EF1480;
}

static const TypeInfo aspeed_2400_wdt_info = {
    .name = TYPE_ASPEED_2400_WDT,
    .parent = TYPE_ASPEED_WDT,
    .instance_size = sizeof(AspeedWDTState),
    .class_init = aspeed_2400_wdt_class_init,
};

static void aspeed_2500_wdt_reset_pulse(AspeedWDTState *s, uint32_t property)
{
    if (property) {
        if (property == WDT_ACTIVE_HIGH_MAGIC) {
            s->regs[WDT_RESET_WIDTH] |= WDT_RESET_WIDTH_ACTIVE_HIGH;
        } else if (property == WDT_ACTIVE_LOW_MAGIC) {
            s->regs[WDT_RESET_WIDTH] &= ~WDT_RESET_WIDTH_ACTIVE_HIGH;
        } else if (property == WDT_PUSH_PULL_MAGIC) {
            s->regs[WDT_RESET_WIDTH] |= WDT_RESET_WIDTH_PUSH_PULL;
        } else if (property == WDT_OPEN_DRAIN_MAGIC) {
            s->regs[WDT_RESET_WIDTH] &= ~WDT_RESET_WIDTH_PUSH_PULL;
        }
    }
}

static void aspeed_2500_wdt_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass);

    dc->desc = "ASPEED 2500 Watchdog Controller";
    awc->offset = 0x20;
    awc->ext_pulse_width_mask = 0xfffff;
    awc->reset_ctrl_reg = SCU_RESET_CONTROL1;
    awc->reset_pulse = aspeed_2500_wdt_reset_pulse;
    awc->wdt_reload = aspeed_wdt_reload_1mhz;
    awc->sanitize_ctrl = aspeed_2500_sanitize_ctrl;
    awc->default_status = 0x014FB180;
    awc->default_reload_value = 0x014FB180;
}

static const TypeInfo aspeed_2500_wdt_info = {
    .name = TYPE_ASPEED_2500_WDT,
    .parent = TYPE_ASPEED_WDT,
    .instance_size = sizeof(AspeedWDTState),
    .class_init = aspeed_2500_wdt_class_init,
};

static void aspeed_2600_wdt_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass);

    dc->desc = "ASPEED 2600 Watchdog Controller";
    awc->offset = 0x40;
    awc->ext_pulse_width_mask = 0xfffff; /* TODO */
    awc->reset_ctrl_reg = AST2600_SCU_RESET_CONTROL1;
    awc->reset_pulse = aspeed_2500_wdt_reset_pulse;
    awc->wdt_reload = aspeed_wdt_reload_1mhz;
    awc->sanitize_ctrl = aspeed_2600_sanitize_ctrl;
    awc->default_status = 0x014FB180;
    awc->default_reload_value = 0x014FB180;
}

static const TypeInfo aspeed_2600_wdt_info = {
    .name = TYPE_ASPEED_2600_WDT,
    .parent = TYPE_ASPEED_WDT,
    .instance_size = sizeof(AspeedWDTState),
    .class_init = aspeed_2600_wdt_class_init,
};

static void aspeed_1030_wdt_class_init(ObjectClass *klass, void *data)
{
    DeviceClass *dc = DEVICE_CLASS(klass);
    AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass);

    dc->desc = "ASPEED 1030 Watchdog Controller";
    awc->offset = 0x80;
    awc->ext_pulse_width_mask = 0xfffff; /* TODO */
    awc->reset_ctrl_reg = AST2600_SCU_RESET_CONTROL1;
    awc->reset_pulse = aspeed_2500_wdt_reset_pulse;
    awc->wdt_reload = aspeed_wdt_reload_1mhz;
    awc->sanitize_ctrl = aspeed_2600_sanitize_ctrl;
    awc->default_status = 0x014FB180;
    awc->default_reload_value = 0x014FB180;
}

static const TypeInfo aspeed_1030_wdt_info = {
    .name = TYPE_ASPEED_1030_WDT,
    .parent = TYPE_ASPEED_WDT,
    .instance_size = sizeof(AspeedWDTState),
    .class_init = aspeed_1030_wdt_class_init,
};

static void wdt_aspeed_register_types(void)
{
    type_register_static(&aspeed_wdt_info);
    type_register_static(&aspeed_2400_wdt_info);
    type_register_static(&aspeed_2500_wdt_info);
    type_register_static(&aspeed_2600_wdt_info);
    type_register_static(&aspeed_1030_wdt_info);
}

type_init(wdt_aspeed_register_types)
Commit	Line	Data
854123bf CLG	1	/*
	2	* ASPEED Watchdog Controller
	3	*
	4	* Copyright (C) 2016-2017 IBM Corp.
	5	*
	6	* This code is licensed under the GPL version 2 or later. See the
	7	* COPYING file in the top-level directory.
	8	*/
	9
	10	#include "qemu/osdep.h"
f55d613b AJ	11
f55d613b AJ	12	#include "qapi/error.h"
854123bf	13	#include "qemu/log.h"
0b8fa32f	14	#include "qemu/module.h"
f55d613b	15	#include "qemu/timer.h"
854123bf	16	#include "sysemu/watchdog.h"
f55d613b	17	#include "hw/misc/aspeed_scu.h"
a27bd6c7	18	#include "hw/qdev-properties.h"
854123bf	19	#include "hw/sysbus.h"
854123bf	20	#include "hw/watchdog/wdt_aspeed.h"
d6454270	21	#include "migration/vmstate.h"
a8eb9a43	22	#include "trace.h"
854123bf	23
f55d613b AJ	24	#define WDT_STATUS (0x00 / 4)
	25	#define WDT_RELOAD_VALUE (0x04 / 4)
	26	#define WDT_RESTART (0x08 / 4)
	27	#define WDT_CTRL (0x0C / 4)
854123bf CLG	28	#define WDT_CTRL_RESET_MODE_SOC (0x00 << 5)
	29	#define WDT_CTRL_RESET_MODE_FULL_CHIP (0x01 << 5)
	30	#define WDT_CTRL_1MHZ_CLK BIT(4)
	31	#define WDT_CTRL_WDT_EXT BIT(3)
	32	#define WDT_CTRL_WDT_INTR BIT(2)
	33	#define WDT_CTRL_RESET_SYSTEM BIT(1)
	34	#define WDT_CTRL_ENABLE BIT(0)
f55d613b AJ	35	#define WDT_RESET_WIDTH (0x18 / 4)
	36	#define WDT_RESET_WIDTH_ACTIVE_HIGH BIT(31)
	37	#define WDT_POLARITY_MASK (0xFF << 24)
	38	#define WDT_ACTIVE_HIGH_MAGIC (0xA5 << 24)
	39	#define WDT_ACTIVE_LOW_MAGIC (0x5A << 24)
	40	#define WDT_RESET_WIDTH_PUSH_PULL BIT(30)
	41	#define WDT_DRIVE_TYPE_MASK (0xFF << 24)
	42	#define WDT_PUSH_PULL_MAGIC (0xA8 << 24)
	43	#define WDT_OPEN_DRAIN_MAGIC (0x8A << 24)
6b2b2a70	44	#define WDT_RESET_MASK1 (0x1c / 4)
854123bf	45
f55d613b AJ	46	#define WDT_TIMEOUT_STATUS (0x10 / 4)
f55d613b AJ	47	#define WDT_TIMEOUT_CLEAR (0x14 / 4)
854123bf	48
f55d613b	49	#define WDT_RESTART_MAGIC 0x4755
854123bf	50
6b2b2a70	51	#define AST2600_SCU_RESET_CONTROL1 (0x40 / 4)
3059c2f5 JS	52	#define SCU_RESET_CONTROL1 (0x04 / 4)
	53	#define SCU_RESET_SDRAM BIT(0)
	54
854123bf CLG	55	static bool aspeed_wdt_is_enabled(const AspeedWDTState *s)
	56	{
	57	return s->regs[WDT_CTRL] & WDT_CTRL_ENABLE;
	58	}
	59
	60	static uint64_t aspeed_wdt_read(void *opaque, hwaddr offset, unsigned size)
	61	{
	62	AspeedWDTState *s = ASPEED_WDT(opaque);
	63
a8eb9a43 CLG	64	trace_aspeed_wdt_read(offset, size);
a8eb9a43 CLG	65
854123bf CLG	66	offset >>= 2;
	67
	68	switch (offset) {
	69	case WDT_STATUS:
	70	return s->regs[WDT_STATUS];
	71	case WDT_RELOAD_VALUE:
	72	return s->regs[WDT_RELOAD_VALUE];
	73	case WDT_RESTART:
	74	qemu_log_mask(LOG_GUEST_ERROR,
	75	"%s: read from write-only reg at offset 0x%"
	76	HWADDR_PRIx "\n", __func__, offset);
	77	return 0;
	78	case WDT_CTRL:
	79	return s->regs[WDT_CTRL];
f55d613b AJ	80	case WDT_RESET_WIDTH:
f55d613b AJ	81	return s->regs[WDT_RESET_WIDTH];
6b2b2a70 JS	82	case WDT_RESET_MASK1:
6b2b2a70 JS	83	return s->regs[WDT_RESET_MASK1];
854123bf CLG	84	case WDT_TIMEOUT_STATUS:
854123bf CLG	85	case WDT_TIMEOUT_CLEAR:
854123bf CLG	86	qemu_log_mask(LOG_UNIMP,
	87	"%s: uninmplemented read at offset 0x%" HWADDR_PRIx "\n",
	88	__func__, offset);
	89	return 0;
	90	default:
	91	qemu_log_mask(LOG_GUEST_ERROR,
	92	"%s: Out-of-bounds read at offset 0x%" HWADDR_PRIx "\n",
	93	__func__, offset);
	94	return 0;
	95	}
	96
	97	}
	98
28c80f15	99	static void aspeed_wdt_reload(AspeedWDTState *s)
854123bf	100	{
f958537a	101	uint64_t reload;
854123bf	102
28c80f15	103	if (!(s->regs[WDT_CTRL] & WDT_CTRL_1MHZ_CLK)) {
854123bf CLG	104	reload = muldiv64(s->regs[WDT_RELOAD_VALUE], NANOSECONDS_PER_SECOND,
	105	s->pclk_freq);
	106	} else {
f958537a	107	reload = s->regs[WDT_RELOAD_VALUE] * 1000ULL;
854123bf CLG	108	}
	109
	110	if (aspeed_wdt_is_enabled(s)) {
	111	timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + reload);
	112	}
	113	}
	114
28c80f15 JS	115	static void aspeed_wdt_reload_1mhz(AspeedWDTState *s)
	116	{
	117	uint64_t reload = s->regs[WDT_RELOAD_VALUE] * 1000ULL;
	118
	119	if (aspeed_wdt_is_enabled(s)) {
	120	timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + reload);
	121	}
	122	}
	123
709098fd AJ	124	static uint64_t aspeed_2400_sanitize_ctrl(uint64_t data)
	125	{
	126	return data & 0xffff;
	127	}
	128
	129	static uint64_t aspeed_2500_sanitize_ctrl(uint64_t data)
	130	{
	131	return (data & ~(0xfUL << 8)) \| WDT_CTRL_1MHZ_CLK;
	132	}
	133
	134	static uint64_t aspeed_2600_sanitize_ctrl(uint64_t data)
	135	{
	136	return data & ~(0x7UL << 7);
	137	}
28c80f15	138
854123bf CLG	139	static void aspeed_wdt_write(void *opaque, hwaddr offset, uint64_t data,
	140	unsigned size)
	141	{
	142	AspeedWDTState *s = ASPEED_WDT(opaque);
6112bd6d	143	AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(s);
709098fd	144	bool enable;
854123bf	145
a8eb9a43 CLG	146	trace_aspeed_wdt_write(offset, size, data);
a8eb9a43 CLG	147
854123bf CLG	148	offset >>= 2;
	149
	150	switch (offset) {
	151	case WDT_STATUS:
	152	qemu_log_mask(LOG_GUEST_ERROR,
	153	"%s: write to read-only reg at offset 0x%"
	154	HWADDR_PRIx "\n", __func__, offset);
	155	break;
	156	case WDT_RELOAD_VALUE:
	157	s->regs[WDT_RELOAD_VALUE] = data;
	158	break;
	159	case WDT_RESTART:
	160	if ((data & 0xFFFF) == WDT_RESTART_MAGIC) {
	161	s->regs[WDT_STATUS] = s->regs[WDT_RELOAD_VALUE];
28c80f15	162	awc->wdt_reload(s);
854123bf CLG	163	}
	164	break;
	165	case WDT_CTRL:
709098fd AJ	166	data = awc->sanitize_ctrl(data);
709098fd AJ	167	enable = data & WDT_CTRL_ENABLE;
854123bf CLG	168	if (enable && !aspeed_wdt_is_enabled(s)) {
854123bf CLG	169	s->regs[WDT_CTRL] = data;
28c80f15	170	awc->wdt_reload(s);
854123bf CLG	171	} else if (!enable && aspeed_wdt_is_enabled(s)) {
	172	s->regs[WDT_CTRL] = data;
	173	timer_del(s->timer);
74b67e1f AJ	174	} else {
74b67e1f AJ	175	s->regs[WDT_CTRL] = data;
854123bf CLG	176	}
854123bf CLG	177	break;
f55d613b	178	case WDT_RESET_WIDTH:
6112bd6d CLG	179	if (awc->reset_pulse) {
6112bd6d CLG	180	awc->reset_pulse(s, data & WDT_POLARITY_MASK);
f55d613b	181	}
6112bd6d CLG	182	s->regs[WDT_RESET_WIDTH] &= ~awc->ext_pulse_width_mask;
6112bd6d CLG	183	s->regs[WDT_RESET_WIDTH] \|= data & awc->ext_pulse_width_mask;
f55d613b	184	break;
6112bd6d	185
6b2b2a70 JS	186	case WDT_RESET_MASK1:
	187	/* TODO: implement */
	188	s->regs[WDT_RESET_MASK1] = data;
	189	break;
	190
854123bf CLG	191	case WDT_TIMEOUT_STATUS:
854123bf CLG	192	case WDT_TIMEOUT_CLEAR:
854123bf CLG	193	qemu_log_mask(LOG_UNIMP,
	194	"%s: uninmplemented write at offset 0x%" HWADDR_PRIx "\n",
	195	__func__, offset);
	196	break;
	197	default:
	198	qemu_log_mask(LOG_GUEST_ERROR,
	199	"%s: Out-of-bounds write at offset 0x%" HWADDR_PRIx "\n",
	200	__func__, offset);
	201	}
	202	return;
	203	}
	204
854123bf CLG	205	static const VMStateDescription vmstate_aspeed_wdt = {
	206	.name = "vmstate_aspeed_wdt",
	207	.version_id = 0,
	208	.minimum_version_id = 0,
	209	.fields = (VMStateField[]) {
	210	VMSTATE_TIMER_PTR(timer, AspeedWDTState),
	211	VMSTATE_UINT32_ARRAY(regs, AspeedWDTState, ASPEED_WDT_REGS_MAX),
	212	VMSTATE_END_OF_LIST()
	213	}
	214	};
	215
	216	static const MemoryRegionOps aspeed_wdt_ops = {
	217	.read = aspeed_wdt_read,
	218	.write = aspeed_wdt_write,
	219	.endianness = DEVICE_LITTLE_ENDIAN,
	220	.valid.min_access_size = 4,
	221	.valid.max_access_size = 4,
	222	.valid.unaligned = false,
	223	};
	224
	225	static void aspeed_wdt_reset(DeviceState *dev)
	226	{
	227	AspeedWDTState *s = ASPEED_WDT(dev);
709098fd	228	AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(s);
854123bf	229
018134ab SL	230	s->regs[WDT_STATUS] = awc->default_status;
018134ab SL	231	s->regs[WDT_RELOAD_VALUE] = awc->default_reload_value;
854123bf	232	s->regs[WDT_RESTART] = 0;
709098fd	233	s->regs[WDT_CTRL] = awc->sanitize_ctrl(0);
f55d613b	234	s->regs[WDT_RESET_WIDTH] = 0xFF;
854123bf CLG	235
	236	timer_del(s->timer);
	237	}
	238
	239	static void aspeed_wdt_timer_expired(void *dev)
	240	{
	241	AspeedWDTState *s = ASPEED_WDT(dev);
6112bd6d	242	uint32_t reset_ctrl_reg = ASPEED_WDT_GET_CLASS(s)->reset_ctrl_reg;
854123bf	243
3059c2f5	244	/* Do not reset on SDRAM controller reset */
6112bd6d	245	if (s->scu->regs[reset_ctrl_reg] & SCU_RESET_SDRAM) {
3059c2f5 JS	246	timer_del(s->timer);
	247	s->regs[WDT_CTRL] = 0;
	248	return;
	249	}
	250
aabf1de4 JS	251	qemu_log_mask(CPU_LOG_RESET, "Watchdog timer %" HWADDR_PRIx " expired.\n",
aabf1de4 JS	252	s->iomem.addr);
854123bf CLG	253	watchdog_perform_action();
	254	timer_del(s->timer);
	255	}
	256
	257	#define PCLK_HZ 24000000
	258
	259	static void aspeed_wdt_realize(DeviceState dev, Error *errp)
	260	{
	261	SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
	262	AspeedWDTState *s = ASPEED_WDT(dev);
3059c2f5	263
2ec11f23	264	assert(s->scu);
854123bf CLG	265
	266	s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, aspeed_wdt_timer_expired, dev);
	267
	268	/* FIXME: This setting should be derived from the SCU hw strapping
	269	* register SCU70
	270	*/
	271	s->pclk_freq = PCLK_HZ;
	272
	273	memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_wdt_ops, s,
	274	TYPE_ASPEED_WDT, ASPEED_WDT_REGS_MAX * 4);
	275	sysbus_init_mmio(sbd, &s->iomem);
	276	}
	277
2ec11f23 CLG	278	static Property aspeed_wdt_properties[] = {
	279	DEFINE_PROP_LINK("scu", AspeedWDTState, scu, TYPE_ASPEED_SCU,
	280	AspeedSCUState *),
	281	DEFINE_PROP_END_OF_LIST(),
	282	};
	283
854123bf CLG	284	static void aspeed_wdt_class_init(ObjectClass klass, void data)
	285	{
	286	DeviceClass *dc = DEVICE_CLASS(klass);
	287
6112bd6d	288	dc->desc = "ASPEED Watchdog Controller";
854123bf CLG	289	dc->realize = aspeed_wdt_realize;
854123bf CLG	290	dc->reset = aspeed_wdt_reset;
b10cb627	291	set_bit(DEVICE_CATEGORY_WATCHDOG, dc->categories);
854123bf	292	dc->vmsd = &vmstate_aspeed_wdt;
4f67d30b	293	device_class_set_props(dc, aspeed_wdt_properties);
b10cb627	294	dc->desc = "Aspeed watchdog device";
854123bf CLG	295	}
	296
	297	static const TypeInfo aspeed_wdt_info = {
	298	.parent = TYPE_SYS_BUS_DEVICE,
	299	.name = TYPE_ASPEED_WDT,
	300	.instance_size = sizeof(AspeedWDTState),
	301	.class_init = aspeed_wdt_class_init,
6112bd6d CLG	302	.class_size = sizeof(AspeedWDTClass),
	303	.abstract = true,
	304	};
	305
	306	static void aspeed_2400_wdt_class_init(ObjectClass klass, void data)
	307	{
	308	DeviceClass *dc = DEVICE_CLASS(klass);
	309	AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass);
	310
	311	dc->desc = "ASPEED 2400 Watchdog Controller";
	312	awc->offset = 0x20;
	313	awc->ext_pulse_width_mask = 0xff;
	314	awc->reset_ctrl_reg = SCU_RESET_CONTROL1;
28c80f15	315	awc->wdt_reload = aspeed_wdt_reload;
709098fd	316	awc->sanitize_ctrl = aspeed_2400_sanitize_ctrl;
018134ab SL	317	awc->default_status = 0x03EF1480;
018134ab SL	318	awc->default_reload_value = 0x03EF1480;
6112bd6d CLG	319	}
	320
	321	static const TypeInfo aspeed_2400_wdt_info = {
	322	.name = TYPE_ASPEED_2400_WDT,
	323	.parent = TYPE_ASPEED_WDT,
	324	.instance_size = sizeof(AspeedWDTState),
	325	.class_init = aspeed_2400_wdt_class_init,
	326	};
	327
	328	static void aspeed_2500_wdt_reset_pulse(AspeedWDTState *s, uint32_t property)
	329	{
	330	if (property) {
	331	if (property == WDT_ACTIVE_HIGH_MAGIC) {
	332	s->regs[WDT_RESET_WIDTH] \|= WDT_RESET_WIDTH_ACTIVE_HIGH;
	333	} else if (property == WDT_ACTIVE_LOW_MAGIC) {
	334	s->regs[WDT_RESET_WIDTH] &= ~WDT_RESET_WIDTH_ACTIVE_HIGH;
	335	} else if (property == WDT_PUSH_PULL_MAGIC) {
	336	s->regs[WDT_RESET_WIDTH] \|= WDT_RESET_WIDTH_PUSH_PULL;
	337	} else if (property == WDT_OPEN_DRAIN_MAGIC) {
	338	s->regs[WDT_RESET_WIDTH] &= ~WDT_RESET_WIDTH_PUSH_PULL;
	339	}
	340	}
	341	}
	342
	343	static void aspeed_2500_wdt_class_init(ObjectClass klass, void data)
	344	{
	345	DeviceClass *dc = DEVICE_CLASS(klass);
	346	AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass);
	347
	348	dc->desc = "ASPEED 2500 Watchdog Controller";
	349	awc->offset = 0x20;
	350	awc->ext_pulse_width_mask = 0xfffff;
	351	awc->reset_ctrl_reg = SCU_RESET_CONTROL1;
	352	awc->reset_pulse = aspeed_2500_wdt_reset_pulse;
28c80f15	353	awc->wdt_reload = aspeed_wdt_reload_1mhz;
709098fd	354	awc->sanitize_ctrl = aspeed_2500_sanitize_ctrl;
018134ab SL	355	awc->default_status = 0x014FB180;
018134ab SL	356	awc->default_reload_value = 0x014FB180;
6112bd6d CLG	357	}
	358
	359	static const TypeInfo aspeed_2500_wdt_info = {
	360	.name = TYPE_ASPEED_2500_WDT,
	361	.parent = TYPE_ASPEED_WDT,
	362	.instance_size = sizeof(AspeedWDTState),
	363	.class_init = aspeed_2500_wdt_class_init,
854123bf CLG	364	};
854123bf CLG	365
6b2b2a70 JS	366	static void aspeed_2600_wdt_class_init(ObjectClass klass, void data)
	367	{
	368	DeviceClass *dc = DEVICE_CLASS(klass);
	369	AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass);
	370
	371	dc->desc = "ASPEED 2600 Watchdog Controller";
	372	awc->offset = 0x40;
	373	awc->ext_pulse_width_mask = 0xfffff; /* TODO */
	374	awc->reset_ctrl_reg = AST2600_SCU_RESET_CONTROL1;
	375	awc->reset_pulse = aspeed_2500_wdt_reset_pulse;
28c80f15	376	awc->wdt_reload = aspeed_wdt_reload_1mhz;
709098fd	377	awc->sanitize_ctrl = aspeed_2600_sanitize_ctrl;
018134ab SL	378	awc->default_status = 0x014FB180;
018134ab SL	379	awc->default_reload_value = 0x014FB180;
6b2b2a70 JS	380	}
	381
	382	static const TypeInfo aspeed_2600_wdt_info = {
	383	.name = TYPE_ASPEED_2600_WDT,
	384	.parent = TYPE_ASPEED_WDT,
	385	.instance_size = sizeof(AspeedWDTState),
	386	.class_init = aspeed_2600_wdt_class_init,
	387	};
	388
e259e01e SL	389	static void aspeed_1030_wdt_class_init(ObjectClass klass, void data)
	390	{
	391	DeviceClass *dc = DEVICE_CLASS(klass);
	392	AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass);
	393
	394	dc->desc = "ASPEED 1030 Watchdog Controller";
	395	awc->offset = 0x80;
	396	awc->ext_pulse_width_mask = 0xfffff; /* TODO */
	397	awc->reset_ctrl_reg = AST2600_SCU_RESET_CONTROL1;
	398	awc->reset_pulse = aspeed_2500_wdt_reset_pulse;
	399	awc->wdt_reload = aspeed_wdt_reload_1mhz;
	400	awc->sanitize_ctrl = aspeed_2600_sanitize_ctrl;
	401	awc->default_status = 0x014FB180;
	402	awc->default_reload_value = 0x014FB180;
	403	}
	404
	405	static const TypeInfo aspeed_1030_wdt_info = {
	406	.name = TYPE_ASPEED_1030_WDT,
	407	.parent = TYPE_ASPEED_WDT,
	408	.instance_size = sizeof(AspeedWDTState),
	409	.class_init = aspeed_1030_wdt_class_init,
	410	};
	411
854123bf CLG	412	static void wdt_aspeed_register_types(void)
854123bf CLG	413	{
854123bf	414	type_register_static(&aspeed_wdt_info);
6112bd6d CLG	415	type_register_static(&aspeed_2400_wdt_info);
6112bd6d CLG	416	type_register_static(&aspeed_2500_wdt_info);
6b2b2a70	417	type_register_static(&aspeed_2600_wdt_info);
e259e01e	418	type_register_static(&aspeed_1030_wdt_info);
854123bf CLG	419	}
	420
	421	type_init(wdt_aspeed_register_types)