new file mode 100644
@@ -0,0 +1,123 @@
+/*
+ * Allwinner Watchdog emulation
+ *
+ * Copyright (C) 2023 Strahinja Jankovic <strahinja.p.jankovic@gmail.com>
+ *
+ * This file is derived from Allwinner RTC,
+ * by Niek Linnenbank.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef HW_WATCHDOG_ALLWINNER_WDT_H
+#define HW_WATCHDOG_ALLWINNER_WDT_H
+
+#include "qom/object.h"
+#include "hw/ptimer.h"
+#include "hw/sysbus.h"
+
+/*
+ * This is a model of the Allwinner watchdog.
+ * Since watchdog registers belong to the timer module (and are shared with the
+ * RTC module), the interrupt line from watchdog is not handled right now.
+ * In QEMU, we just wire up the watchdog reset to watchdog_perform_action(),
+ * at least for the moment.
+ */
+
+#define TYPE_AW_WDT "allwinner-wdt"
+
+/** Allwinner WDT sun4i family (A10, A12), also sun7i (A20) */
+#define TYPE_AW_WDT_SUN4I TYPE_AW_WDT "-sun4i"
+
+/** Allwinner WDT sun6i family and newer (A31, H2+, H3, etc) */
+#define TYPE_AW_WDT_SUN6I TYPE_AW_WDT "-sun6i"
+
+/** Number of WDT registers */
+#define AW_WDT_REGS_NUM (5)
+
+OBJECT_DECLARE_TYPE(AwWdtState, AwWdtClass, AW_WDT)
+
+/**
+ * Allwinner WDT object instance state.
+ */
+struct AwWdtState {
+ /*< private >*/
+ SysBusDevice parent_obj;
+
+ /*< public >*/
+ MemoryRegion iomem;
+ struct ptimer_state *timer;
+
+ uint32_t regs[AW_WDT_REGS_NUM];
+};
+
+/**
+ * Allwinner WDT class-level struct.
+ *
+ * This struct is filled by each sunxi device specific code
+ * such that the generic code can use this struct to support
+ * all devices.
+ */
+struct AwWdtClass {
+ /*< private >*/
+ SysBusDeviceClass parent_class;
+ /*< public >*/
+
+ /** Defines device specific register map */
+ const uint8_t *regmap;
+
+ /** Size of the regmap in bytes */
+ size_t regmap_size;
+
+ /**
+ * Read device specific register
+ *
+ * @offset: register offset to read
+ * @return true if register read successful, false otherwise
+ */
+ bool (*read)(AwWdtState *s, uint32_t offset);
+
+ /**
+ * Write device specific register
+ *
+ * @offset: register offset to write
+ * @data: value to set in register
+ * @return true if register write successful, false otherwise
+ */
+ bool (*write)(AwWdtState *s, uint32_t offset, uint32_t data);
+
+ /**
+ * Check if watchdog can generate system reset
+ *
+ * @return true if watchdog can generate system reset
+ */
+ bool (*can_reset_system)(AwWdtState *s);
+
+ /**
+ * Check if provided key is valid
+ *
+ * @value: value written to register
+ * @return true if key is valid, false otherwise
+ */
+ bool (*is_key_valid)(AwWdtState *s, uint32_t val);
+
+ /**
+ * Get current INTV_VALUE setting
+ *
+ * @return current INTV_VALUE (0-15)
+ */
+ uint8_t (*get_intv_value)(AwWdtState *s);
+};
+
+#endif /* HW_WATCHDOG_ALLWINNER_WDT_H */
new file mode 100644
@@ -0,0 +1,416 @@
+/*
+ * Allwinner Watchdog emulation
+ *
+ * Copyright (C) 2023 Strahinja Jankovic <strahinja.p.jankovic@gmail.com>
+ *
+ * This file is derived from Allwinner RTC,
+ * by Niek Linnenbank.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "qemu/units.h"
+#include "qemu/module.h"
+#include "trace.h"
+#include "hw/sysbus.h"
+#include "hw/registerfields.h"
+#include "hw/watchdog/allwinner-wdt.h"
+#include "sysemu/watchdog.h"
+#include "migration/vmstate.h"
+
+/* WDT registers */
+enum {
+ REG_IRQ_EN = 0, /* Watchdog interrupt enable */
+ REG_IRQ_STA, /* Watchdog interrupt status */
+ REG_CTRL, /* Watchdog control register */
+ REG_CFG, /* Watchdog configuration register */
+ REG_MODE, /* Watchdog mode register */
+};
+
+/* Universal WDT register flags */
+#define WDT_RESTART_MASK (1 << 0)
+#define WDT_EN_MASK (1 << 0)
+
+/* sun4i specific WDT register flags */
+#define RST_EN_SUN4I_MASK (1 << 1)
+#define INTV_VALUE_SUN4I_SHIFT (3)
+#define INTV_VALUE_SUN4I_MASK (0xfu << INTV_VALUE_SUN4I_SHIFT)
+
+/* sun6i specific WDT register flags */
+#define RST_EN_SUN6I_MASK (1 << 0)
+#define KEY_FIELD_SUN6I_SHIFT (1)
+#define KEY_FIELD_SUN6I_MASK (0xfffu << KEY_FIELD_SUN6I_SHIFT)
+#define KEY_FIELD_SUN6I (0xA57u)
+#define INTV_VALUE_SUN6I_SHIFT (4)
+#define INTV_VALUE_SUN6I_MASK (0xfu << INTV_VALUE_SUN6I_SHIFT)
+
+/* Map of INTV_VALUE to 0.5s units. */
+static const uint8_t allwinner_wdt_count_map[] = {
+ 1,
+ 2,
+ 4,
+ 6,
+ 8,
+ 10,
+ 12,
+ 16,
+ 20,
+ 24,
+ 28,
+ 32
+};
+
+/* WDT sun4i register map (offset to name) */
+const uint8_t allwinner_wdt_sun4i_regmap[] = {
+ [0x0000] = REG_CTRL,
+ [0x0004] = REG_MODE,
+};
+
+/* WDT sun6i register map (offset to name) */
+const uint8_t allwinner_wdt_sun6i_regmap[] = {
+ [0x0000] = REG_IRQ_EN,
+ [0x0004] = REG_IRQ_STA,
+ [0x0010] = REG_CTRL,
+ [0x0014] = REG_CFG,
+ [0x0018] = REG_MODE,
+};
+
+static bool allwinner_wdt_sun4i_read(AwWdtState *s, uint32_t offset)
+{
+ /* no sun4i specific registers currently implemented */
+ return false;
+}
+
+static bool allwinner_wdt_sun4i_write(AwWdtState *s, uint32_t offset,
+ uint32_t data)
+{
+ /* no sun4i specific registers currently implemented */
+ return false;
+}
+
+static bool allwinner_wdt_sun4i_can_reset_system(AwWdtState *s)
+{
+ if (s->regs[REG_MODE] & RST_EN_SUN4I_MASK) {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+static bool allwinner_wdt_sun4i_is_key_valid(AwWdtState *s, uint32_t val)
+{
+ /* sun4i has no key */
+ return true;
+}
+
+static uint8_t allwinner_wdt_sun4i_get_intv_value(AwWdtState *s)
+{
+ return ((s->regs[REG_MODE] & INTV_VALUE_SUN4I_MASK) >>
+ INTV_VALUE_SUN4I_SHIFT);
+}
+
+static bool allwinner_wdt_sun6i_read(AwWdtState *s, uint32_t offset)
+{
+ const AwWdtClass *c = AW_WDT_GET_CLASS(s);
+
+ switch (c->regmap[offset]) {
+ case REG_IRQ_EN:
+ case REG_IRQ_STA:
+ case REG_CFG:
+ return true;
+ default:
+ break;
+ }
+ return false;
+}
+
+static bool allwinner_wdt_sun6i_write(AwWdtState *s, uint32_t offset,
+ uint32_t data)
+{
+ const AwWdtClass *c = AW_WDT_GET_CLASS(s);
+
+ switch (c->regmap[offset]) {
+ case REG_IRQ_EN:
+ case REG_IRQ_STA:
+ case REG_CFG:
+ return true;
+ default:
+ break;
+ }
+ return false;
+}
+
+static bool allwinner_wdt_sun6i_can_reset_system(AwWdtState *s)
+{
+ if (s->regs[REG_CFG] & RST_EN_SUN6I_MASK) {
+ return true;
+ } else {
+ return false;
+ }
+}
+
+static bool allwinner_wdt_sun6i_is_key_valid(AwWdtState *s, uint32_t val)
+{
+ uint16_t key = (val & KEY_FIELD_SUN6I_MASK) >> KEY_FIELD_SUN6I_SHIFT;
+ return (key == KEY_FIELD_SUN6I);
+}
+
+static uint8_t allwinner_wdt_sun6i_get_intv_value(AwWdtState *s)
+{
+ return ((s->regs[REG_MODE] & INTV_VALUE_SUN6I_MASK) >>
+ INTV_VALUE_SUN6I_SHIFT);
+}
+
+static void allwinner_wdt_update_timer(AwWdtState *s)
+{
+ const AwWdtClass *c = AW_WDT_GET_CLASS(s);
+ uint8_t count = c->get_intv_value(s);
+
+ ptimer_transaction_begin(s->timer);
+ ptimer_stop(s->timer);
+
+ /* Use map to convert. */
+ if (count < sizeof(allwinner_wdt_count_map)) {
+ ptimer_set_count(s->timer, allwinner_wdt_count_map[count]);
+ } else {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: incorrect INTV_VALUE 0x%02x\n",
+ __func__, count);
+ }
+
+ ptimer_run(s->timer, 1);
+ ptimer_transaction_commit(s->timer);
+
+ trace_allwinner_wdt_update_timer(count);
+}
+
+static uint64_t allwinner_wdt_read(void *opaque, hwaddr offset,
+ unsigned size)
+{
+ AwWdtState *s = AW_WDT(opaque);
+ const AwWdtClass *c = AW_WDT_GET_CLASS(s);
+ uint64_t r;
+
+ if (offset >= c->regmap_size) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n",
+ __func__, (uint32_t)offset);
+ return 0;
+ }
+
+ switch (c->regmap[offset]) {
+ case REG_CTRL:
+ case REG_MODE:
+ r = s->regs[c->regmap[offset]];
+ break;
+ default:
+ if (!c->read(s, offset)) {
+ qemu_log_mask(LOG_UNIMP, "%s: unimplemented register 0x%04x\n",
+ __func__, (uint32_t)offset);
+ return 0;
+ }
+ r = s->regs[c->regmap[offset]];
+ break;
+ }
+
+ trace_allwinner_wdt_read(offset, r, size);
+
+ return r;
+}
+
+static void allwinner_wdt_write(void *opaque, hwaddr offset,
+ uint64_t val, unsigned size)
+{
+ AwWdtState *s = AW_WDT(opaque);
+ const AwWdtClass *c = AW_WDT_GET_CLASS(s);
+ uint32_t old_val;
+
+ if (offset >= c->regmap_size) {
+ qemu_log_mask(LOG_GUEST_ERROR, "%s: out-of-bounds offset 0x%04x\n",
+ __func__, (uint32_t)offset);
+ return;
+ }
+
+ trace_allwinner_wdt_write(offset, val, size);
+
+ switch (c->regmap[offset]) {
+ case REG_CTRL:
+ if (c->is_key_valid(s, val)) {
+ if (val & WDT_RESTART_MASK) {
+ /* Kick timer */
+ allwinner_wdt_update_timer(s);
+ }
+ }
+ break;
+ case REG_MODE:
+ old_val = s->regs[REG_MODE];
+ s->regs[REG_MODE] = (uint32_t)val;
+
+ /* Check for rising edge on WDOG_MODE_EN */
+ if ((s->regs[REG_MODE] & ~old_val) & WDT_EN_MASK) {
+ allwinner_wdt_update_timer(s);
+ }
+ break;
+ default:
+ if (!c->write(s, offset, val)) {
+ qemu_log_mask(LOG_UNIMP, "%s: unimplemented register 0x%04x\n",
+ __func__, (uint32_t)offset);
+ }
+ s->regs[c->regmap[offset]] = (uint32_t)val;
+ break;
+ }
+}
+
+static const MemoryRegionOps allwinner_wdt_ops = {
+ .read = allwinner_wdt_read,
+ .write = allwinner_wdt_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .valid = {
+ .min_access_size = 4,
+ .max_access_size = 4,
+ },
+ .impl.min_access_size = 4,
+};
+
+static void allwinner_wdt_expired(void *opaque)
+{
+ AwWdtState *s = AW_WDT(opaque);
+ const AwWdtClass *c = AW_WDT_GET_CLASS(s);
+
+ bool enabled = s->regs[REG_MODE] & WDT_EN_MASK;
+ bool reset_enabled = c->can_reset_system(s);
+
+ trace_allwinner_wdt_expired(enabled, reset_enabled);
+
+ /* Perform watchdog action if watchdog is enabled and can trigger reset */
+ if (enabled && reset_enabled) {
+ watchdog_perform_action();
+ }
+}
+
+static void allwinner_wdt_reset_enter(Object *obj, ResetType type)
+{
+ AwWdtState *s = AW_WDT(obj);
+
+ trace_allwinner_wdt_reset_enter();
+
+ /* Clear registers */
+ memset(s->regs, 0, sizeof(s->regs));
+}
+
+static const VMStateDescription allwinner_wdt_vmstate = {
+ .name = "allwinner-wdt",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_PTIMER(timer, AwWdtState),
+ VMSTATE_UINT32_ARRAY(regs, AwWdtState, AW_WDT_REGS_NUM),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static void allwinner_wdt_init(Object *obj)
+{
+ SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
+ AwWdtState *s = AW_WDT(obj);
+ const AwWdtClass *c = AW_WDT_GET_CLASS(s);
+
+ /* Memory mapping */
+ memory_region_init_io(&s->iomem, OBJECT(s), &allwinner_wdt_ops, s,
+ TYPE_AW_WDT, c->regmap_size * 4);
+ sysbus_init_mmio(sbd, &s->iomem);
+}
+
+static void allwinner_wdt_realize(DeviceState *dev, Error **errp)
+{
+ AwWdtState *s = AW_WDT(dev);
+
+ s->timer = ptimer_init(allwinner_wdt_expired, s,
+ PTIMER_POLICY_NO_IMMEDIATE_TRIGGER |
+ PTIMER_POLICY_NO_IMMEDIATE_RELOAD |
+ PTIMER_POLICY_NO_COUNTER_ROUND_DOWN);
+
+ ptimer_transaction_begin(s->timer);
+ /* Set to 2Hz (0.5s period); other periods are multiples of 0.5s. */
+ ptimer_set_freq(s->timer, 2);
+ ptimer_set_limit(s->timer, 0xff, 1);
+ ptimer_transaction_commit(s->timer);
+}
+
+static void allwinner_wdt_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+ ResettableClass *rc = RESETTABLE_CLASS(klass);
+
+ rc->phases.enter = allwinner_wdt_reset_enter;
+ dc->realize = allwinner_wdt_realize;
+ dc->vmsd = &allwinner_wdt_vmstate;
+}
+
+static void allwinner_wdt_sun4i_class_init(ObjectClass *klass, void *data)
+{
+ AwWdtClass *awc = AW_WDT_CLASS(klass);
+
+ awc->regmap = allwinner_wdt_sun4i_regmap;
+ awc->regmap_size = sizeof(allwinner_wdt_sun4i_regmap);
+ awc->read = allwinner_wdt_sun4i_read;
+ awc->write = allwinner_wdt_sun4i_write;
+ awc->can_reset_system = allwinner_wdt_sun4i_can_reset_system;
+ awc->is_key_valid = allwinner_wdt_sun4i_is_key_valid;
+ awc->get_intv_value = allwinner_wdt_sun4i_get_intv_value;
+}
+
+static void allwinner_wdt_sun6i_class_init(ObjectClass *klass, void *data)
+{
+ AwWdtClass *awc = AW_WDT_CLASS(klass);
+
+ awc->regmap = allwinner_wdt_sun6i_regmap;
+ awc->regmap_size = sizeof(allwinner_wdt_sun6i_regmap);
+ awc->read = allwinner_wdt_sun6i_read;
+ awc->write = allwinner_wdt_sun6i_write;
+ awc->can_reset_system = allwinner_wdt_sun6i_can_reset_system;
+ awc->is_key_valid = allwinner_wdt_sun6i_is_key_valid;
+ awc->get_intv_value = allwinner_wdt_sun6i_get_intv_value;
+}
+
+static const TypeInfo allwinner_wdt_info = {
+ .name = TYPE_AW_WDT,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_init = allwinner_wdt_init,
+ .instance_size = sizeof(AwWdtState),
+ .class_init = allwinner_wdt_class_init,
+ .class_size = sizeof(AwWdtClass),
+ .abstract = true,
+};
+
+static const TypeInfo allwinner_wdt_sun4i_info = {
+ .name = TYPE_AW_WDT_SUN4I,
+ .parent = TYPE_AW_WDT,
+ .class_init = allwinner_wdt_sun4i_class_init,
+};
+
+static const TypeInfo allwinner_wdt_sun6i_info = {
+ .name = TYPE_AW_WDT_SUN6I,
+ .parent = TYPE_AW_WDT,
+ .class_init = allwinner_wdt_sun6i_class_init,
+};
+
+static void allwinner_wdt_register(void)
+{
+ type_register_static(&allwinner_wdt_info);
+ type_register_static(&allwinner_wdt_sun4i_info);
+ type_register_static(&allwinner_wdt_sun6i_info);
+}
+
+type_init(allwinner_wdt_register)
@@ -20,3 +20,7 @@ config WDT_IMX2
config WDT_SBSA
bool
+
+config ALLWINNER_WDT
+ bool
+ select PTIMER
@@ -1,4 +1,5 @@
softmmu_ss.add(files('watchdog.c'))
+softmmu_ss.add(when: 'CONFIG_ALLWINNER_WDT', if_true: files('allwinner-wdt.c'))
softmmu_ss.add(when: 'CONFIG_CMSDK_APB_WATCHDOG', if_true: files('cmsdk-apb-watchdog.c'))
softmmu_ss.add(when: 'CONFIG_WDT_IB6300ESB', if_true: files('wdt_i6300esb.c'))
softmmu_ss.add(when: 'CONFIG_WDT_IB700', if_true: files('wdt_ib700.c'))
@@ -1,5 +1,12 @@
# See docs/devel/tracing.rst for syntax documentation.
+# allwinner-wdt.c
+allwinner_wdt_read(uint64_t offset, uint64_t data, unsigned size) "Allwinner watchdog read: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u"
+allwinner_wdt_write(uint64_t offset, uint64_t data, unsigned size) "Allwinner watchdog write: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u"
+allwinner_wdt_reset_enter(void) "Allwinner watchdog: reset"
+allwinner_wdt_update_timer(uint8_t count) "Allwinner watchdog: count %" PRIu8
+allwinner_wdt_expired(bool enabled, bool reset_enabled) "Allwinner watchdog: enabled %u reset_enabled %u"
+
# cmsdk-apb-watchdog.c
cmsdk_apb_watchdog_read(uint64_t offset, uint64_t data, unsigned size) "CMSDK APB watchdog read: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u"
cmsdk_apb_watchdog_write(uint64_t offset, uint64_t data, unsigned size) "CMSDK APB watchdog write: offset 0x%" PRIx64 " data 0x%" PRIx64 " size %u"