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qemu/hw/watchdog/wdt_aspeed.c
Jamin Lin a22acbb252 aspeed/wdt: Support software reset mode for AST2600 
On the AST2400 and AST2500 platforms, the system can only be reset by enabling
the WDT (Watchdog Timer) and waiting for the WDT timeout. However, starting
from the AST2600 platform, the reset event can be triggered directly and
intentionally by software, without relying on the WDT timeout.

This mechanism, referred to as "software restart", is implemented in hardware.
When using the software restart mechanism, the WDT counter is not enabled.

To trigger a reset generation in software mode, write 0xAEEDF123 to register
0x24 and software mode reset only support SOC reset mode.

A new function, "aspeed_wdt_is_soc_reset_mode", is introduced to determine
whether the SoC reset mode is active.

Signed-off-by: Jamin Lin <jamin_lin@aspeedtech.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250124030249.1706996-3-jamin_lin@aspeedtech.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
2025-01-27 09:38:15 +01:00

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/*
* 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 "system/watchdog.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_RESET_MASK2 (0x20 / 4)
#define WDT_SW_RESET_CTRL (0x24 / 4)
#define WDT_SW_RESET_MASK1 (0x28 / 4)
#define WDT_SW_RESET_MASK2 (0x2c / 4)
#define WDT_TIMEOUT_STATUS (0x10 / 4)
#define WDT_TIMEOUT_CLEAR (0x14 / 4)
#define WDT_RESTART_MAGIC 0x4755
#define WDT_SW_RESET_ENABLE 0xAEEDF123
#define AST2600_SCU_RESET_CONTROL1 (0x40 / 4)
#define SCU_RESET_CONTROL1 (0x04 / 4)
#define SCU_RESET_SDRAM BIT(0)
static bool aspeed_wdt_is_soc_reset_mode(const AspeedWDTState *s)
{
uint32_t mode;
mode = extract32(s->regs[WDT_CTRL], 5, 2);
return (mode == WDT_CTRL_RESET_MODE_SOC);
}
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:
case WDT_RESET_MASK2:
case WDT_SW_RESET_CTRL:
case WDT_SW_RESET_MASK1:
case WDT_SW_RESET_MASK2:
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:
case WDT_RESET_MASK2:
case WDT_SW_RESET_MASK1:
case WDT_SW_RESET_MASK2:
qemu_log_mask(LOG_UNIMP,
"%s: uninmplemented write at offset 0x%" HWADDR_PRIx "\n",
__func__, offset);
break;
case WDT_SW_RESET_CTRL:
if (aspeed_wdt_is_soc_reset_mode(s) &&
(data == WDT_SW_RESET_ENABLE)) {
watchdog_perform_action();
}
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 = (const 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);
AspeedWDTClass *awc = ASPEED_WDT_GET_CLASS(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, awc->iosize);
sysbus_init_mmio(sbd, &s->iomem);
}
static const Property aspeed_wdt_properties[] = {
DEFINE_PROP_LINK("scu", AspeedWDTState, scu, TYPE_ASPEED_SCU,
AspeedSCUState *),
};
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;
device_class_set_legacy_reset(dc, 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->iosize = 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->iosize = 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->iosize = 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->iosize = 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 aspeed_2700_wdt_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
AspeedWDTClass *awc = ASPEED_WDT_CLASS(klass);
dc->desc = "ASPEED 2700 Watchdog Controller";
awc->iosize = 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_2700_wdt_info = {
.name = TYPE_ASPEED_2700_WDT,
.parent = TYPE_ASPEED_WDT,
.instance_size = sizeof(AspeedWDTState),
.class_init = aspeed_2700_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_2700_wdt_info);
type_register_static(&aspeed_1030_wdt_info);
}
type_init(wdt_aspeed_register_types)
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