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qemu-e2k/hw/watchdog/wdt_aspeed.c
Paolo Bonzini b10cb62752 watchdog: add information from -watchdog help to -device help 
List all watchdog devices in a separate category, and populate
their descriptions.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-11-02 15:57:27 +01:00

398 lines
12 KiB
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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 "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 WatchdogTimerModel model = {
.wdt_name = TYPE_ASPEED_WDT,
.wdt_description = "Aspeed watchdog device",
};
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] = 0x3EF1480;
s->regs[WDT_RELOAD_VALUE] = 0x03EF1480;
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;
}
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;
}
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;
}
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 wdt_aspeed_register_types(void)
{
watchdog_add_model(&model);
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_init(wdt_aspeed_register_types)
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