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-rw-r--r--hw/watchdog/Makefile.objs1
-rw-r--r--hw/watchdog/wdt_aspeed.c225
2 files changed, 226 insertions, 0 deletions
diff --git a/hw/watchdog/Makefile.objs b/hw/watchdog/Makefile.objs
index 72e3ffd93c..9589bed63a 100644
--- a/hw/watchdog/Makefile.objs
+++ b/hw/watchdog/Makefile.objs
@@ -2,3 +2,4 @@ common-obj-y += watchdog.o
common-obj-$(CONFIG_WDT_IB6300ESB) += wdt_i6300esb.o
common-obj-$(CONFIG_WDT_IB700) += wdt_ib700.o
common-obj-$(CONFIG_WDT_DIAG288) += wdt_diag288.o
+common-obj-$(CONFIG_ASPEED_SOC) += wdt_aspeed.o
diff --git a/hw/watchdog/wdt_aspeed.c b/hw/watchdog/wdt_aspeed.c
new file mode 100644
index 0000000000..8bbe579b6b
--- /dev/null
+++ b/hw/watchdog/wdt_aspeed.c
@@ -0,0 +1,225 @@
+/*
+ * 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 "qemu/log.h"
+#include "sysemu/watchdog.h"
+#include "hw/sysbus.h"
+#include "qemu/timer.h"
+#include "hw/watchdog/wdt_aspeed.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_TIMEOUT_STATUS (0x10 / 4)
+#define WDT_TIMEOUT_CLEAR (0x14 / 4)
+#define WDT_RESET_WDITH (0x18 / 4)
+
+#define WDT_RESTART_MAGIC 0x4755
+
+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);
+
+ 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_TIMEOUT_STATUS:
+ case WDT_TIMEOUT_CLEAR:
+ case WDT_RESET_WDITH:
+ 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, bool pclk)
+{
+ uint32_t reload;
+
+ if (pclk) {
+ reload = muldiv64(s->regs[WDT_RELOAD_VALUE], NANOSECONDS_PER_SECOND,
+ s->pclk_freq);
+ } else {
+ reload = s->regs[WDT_RELOAD_VALUE] * 1000;
+ }
+
+ if (aspeed_wdt_is_enabled(s)) {
+ timer_mod(s->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + reload);
+ }
+}
+
+static void aspeed_wdt_write(void *opaque, hwaddr offset, uint64_t data,
+ unsigned size)
+{
+ AspeedWDTState *s = ASPEED_WDT(opaque);
+ bool enable = data & WDT_CTRL_ENABLE;
+
+ 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];
+ aspeed_wdt_reload(s, !(data & WDT_CTRL_1MHZ_CLK));
+ }
+ break;
+ case WDT_CTRL:
+ if (enable && !aspeed_wdt_is_enabled(s)) {
+ s->regs[WDT_CTRL] = data;
+ aspeed_wdt_reload(s, !(data & WDT_CTRL_1MHZ_CLK));
+ } else if (!enable && aspeed_wdt_is_enabled(s)) {
+ s->regs[WDT_CTRL] = data;
+ timer_del(s->timer);
+ }
+ break;
+ case WDT_TIMEOUT_STATUS:
+ case WDT_TIMEOUT_CLEAR:
+ case WDT_RESET_WDITH:
+ 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);
+
+ s->regs[WDT_STATUS] = 0x3EF1480;
+ s->regs[WDT_RELOAD_VALUE] = 0x03EF1480;
+ s->regs[WDT_RESTART] = 0;
+ s->regs[WDT_CTRL] = 0;
+
+ timer_del(s->timer);
+}
+
+static void aspeed_wdt_timer_expired(void *dev)
+{
+ AspeedWDTState *s = ASPEED_WDT(dev);
+
+ qemu_log_mask(CPU_LOG_RESET, "Watchdog timer expired.\n");
+ 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);
+
+ 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 void aspeed_wdt_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->realize = aspeed_wdt_realize;
+ dc->reset = aspeed_wdt_reset;
+ set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+ dc->vmsd = &vmstate_aspeed_wdt;
+}
+
+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,
+};
+
+static void wdt_aspeed_register_types(void)
+{
+ watchdog_add_model(&model);
+ type_register_static(&aspeed_wdt_info);
+}
+
+type_init(wdt_aspeed_register_types)
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-26 02:36:39 +0000