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[PATCH v4 1/2] hw/watchdog: Implement SBSA watchdog device
|
From: |
Shashi Mallela |
|
Subject: |
[PATCH v4 1/2] hw/watchdog: Implement SBSA watchdog device |
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Date: |
Thu, 8 Oct 2020 11:37:17 -0400 |
Generic watchdog device model has been implemented as per ARM BSAv0.9
Signed-off-by: Shashi Mallela <shashi.mallela@linaro.org>
---
hw/arm/Kconfig | 1 +
hw/watchdog/Kconfig | 4 +
hw/watchdog/meson.build | 1 +
hw/watchdog/wdt_sbsa_gwdt.c | 346 ++++++++++++++++++++++++++++
include/hw/watchdog/wdt_sbsa_gwdt.h | 70 ++++++
5 files changed, 422 insertions(+)
create mode 100644 hw/watchdog/wdt_sbsa_gwdt.c
create mode 100644 include/hw/watchdog/wdt_sbsa_gwdt.h
diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
index f303c6bead25..6b97e64595d3 100644
--- a/hw/arm/Kconfig
+++ b/hw/arm/Kconfig
@@ -210,6 +210,7 @@ config SBSA_REF
select PL031 # RTC
select PL061 # GPIO
select USB_EHCI_SYSBUS
+ select WDT_SBSA_GWDT
config SABRELITE
bool
diff --git a/hw/watchdog/Kconfig b/hw/watchdog/Kconfig
index 293209b291d6..ea9cadd66f22 100644
--- a/hw/watchdog/Kconfig
+++ b/hw/watchdog/Kconfig
@@ -17,3 +17,7 @@ config WDT_DIAG288
config WDT_IMX2
bool
+
+config WDT_SBSA_GWDT
+ bool
+ default y if SBSA_REF
diff --git a/hw/watchdog/meson.build b/hw/watchdog/meson.build
index 9b8725e64288..a9a23307acfe 100644
--- a/hw/watchdog/meson.build
+++ b/hw/watchdog/meson.build
@@ -5,3 +5,4 @@ softmmu_ss.add(when: 'CONFIG_WDT_IB700', if_true:
files('wdt_ib700.c'))
softmmu_ss.add(when: 'CONFIG_WDT_DIAG288', if_true: files('wdt_diag288.c'))
softmmu_ss.add(when: 'CONFIG_ASPEED_SOC', if_true: files('wdt_aspeed.c'))
softmmu_ss.add(when: 'CONFIG_WDT_IMX2', if_true: files('wdt_imx2.c'))
+softmmu_ss.add(when: 'CONFIG_WDT_SBSA_GWDT', if_true: files('wdt_sbsa_gwdt.c'))
diff --git a/hw/watchdog/wdt_sbsa_gwdt.c b/hw/watchdog/wdt_sbsa_gwdt.c
new file mode 100644
index 000000000000..6c6c0d145018
--- /dev/null
+++ b/hw/watchdog/wdt_sbsa_gwdt.c
@@ -0,0 +1,346 @@
+/*
+ * Generic watchdog device model for SBSA
+ *
+ * Copyright Linaro.org 2020
+ *
+ * Authors:
+ * Shashi Mallela <shashi.mallela@linaro.org>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or (at your
+ * option) any later version. See the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "sysemu/reset.h"
+#include "sysemu/watchdog.h"
+#include "hw/watchdog/wdt_sbsa_gwdt.h"
+#include "qemu/timer.h"
+#include "migration/vmstate.h"
+#include "qemu/log.h"
+#include "qemu/module.h"
+
+static WatchdogTimerModel model = {
+ .wdt_name = TYPE_WDT_SBSA_GWDT,
+ .wdt_description = "sbsa_gwdt device for sbsa_ref platform",
+};
+
+static const VMStateDescription vmstate_sbsa_gwdt = {
+ .name = "vmstate_sbsa_gwdt",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_TIMER_PTR(timer, SBSA_GWDTState),
+ VMSTATE_BOOL(enabled, SBSA_GWDTState),
+ VMSTATE_BOOL(ws0, SBSA_GWDTState),
+ VMSTATE_BOOL(ws1, SBSA_GWDTState),
+ VMSTATE_UINT32(wrr, SBSA_GWDTState),
+ VMSTATE_UINT32(wcs, SBSA_GWDTState),
+ VMSTATE_UINT32(worl, SBSA_GWDTState),
+ VMSTATE_UINT32(woru, SBSA_GWDTState),
+ VMSTATE_UINT32(wcvl, SBSA_GWDTState),
+ VMSTATE_UINT32(wcvu, SBSA_GWDTState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
+static uint64_t sbsa_gwdt_rread(void *opaque, hwaddr addr, unsigned int size)
+{
+ uint32_t ret;
+
+ if (addr == SBSA_GWDT_WRR) {
+ /* watch refresh read has no effect and returns 0 */
+ ret = 0;
+ } else {
+ qemu_log_mask(LOG_GUEST_ERROR, "bad address in refresh frame read :"
+ " 0x%x\n", (int)addr);
+ }
+ return ret;
+}
+
+static uint64_t sbsa_gwdt_read(void *opaque, hwaddr addr, unsigned int size)
+{
+ SBSA_GWDTState *s = SBSA_GWDT(opaque);
+ uint32_t ret = 0;
+
+ switch (addr) {
+ case SBSA_GWDT_WCS:
+ ret = s->wcs;
+ break;
+ case SBSA_GWDT_WOR:
+ ret = s->worl;
+ break;
+ case SBSA_GWDT_WORU:
+ ret = s->woru;
+ break;
+ case SBSA_GWDT_WCV:
+ ret = s->wcvl;
+ break;
+ case SBSA_GWDT_WCVU:
+ ret = s->wcvu;
+ break;
+ case SBSA_GWDT_W_IIDR:
+ ret = s->id;
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR, "bad address in control frame read :"
+ " 0x%x\n", (int)addr);
+ }
+ return ret;
+}
+
+static void sbsa_gwdt_update_timer(SBSA_GWDTState *s)
+{
+ uint64_t timeout = 0;
+
+ if (s->enabled) {
+ /*
+ * Extract the upper 16 bits from woru & 32 bits from worl
+ * registers to construct the 48 bit offset value
+ */
+ timeout = s->woru & SBSA_GWDT_WOR_MASK;
+ timeout <<= 32;
+ timeout |= s->worl;
+ timeout = muldiv64(timeout, NANOSECONDS_PER_SECOND, SBSA_TIMER_FREQ);
+ timeout += qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+
+ /* store the current timeout value into compare registers */
+ s->wcvu = timeout >> 32;
+ s->wcvl = timeout;
+
+ if (!s->ws0) {
+ timer_del(s->timer);
+ timer_mod(s->ptimer, timeout);
+ } else {
+ timer_del(s->ptimer);
+ timer_mod(s->timer, timeout);
+ }
+ } else {
+ timer_del(s->ptimer);
+ timer_del(s->timer);
+ }
+}
+
+static void sbsa_gwdt_rwrite(void *opaque, hwaddr offset, uint64_t data,
+ unsigned size) {
+ SBSA_GWDTState *s = SBSA_GWDT(opaque);
+
+ if (offset == SBSA_GWDT_WRR) {
+ s->wrr = data;
+ s->wcs &= ~SBSA_GWDT_WCS_WS0;
+ s->wcs &= ~SBSA_GWDT_WCS_WS1;
+ s->ws0 = false;
+ s->ws1 = false;
+ sbsa_gwdt_update_timer(s);
+ } else {
+ qemu_log_mask(LOG_GUEST_ERROR, "bad address in refresh frame write :"
+ " 0x%x\n", (int)offset);
+ }
+}
+
+static void sbsa_gwdt_write(void *opaque, hwaddr offset, uint64_t data,
+ unsigned size) {
+ SBSA_GWDTState *s = SBSA_GWDT(opaque);
+ bool enable;
+
+ switch (offset) {
+ case SBSA_GWDT_WCS:
+ enable = data & SBSA_GWDT_WCS_EN;
+ if (enable) {
+ s->wcs |= SBSA_GWDT_WCS_EN;
+ s->enabled = true;
+ } else {
+ s->wcs &= ~SBSA_GWDT_WCS_EN;
+ s->enabled = false;
+ }
+ s->ws0 = false;
+ s->ws1 = false;
+ s->wcs &= ~SBSA_GWDT_WCS_WS0;
+ s->wcs &= ~SBSA_GWDT_WCS_WS1;
+ sbsa_gwdt_update_timer(s);
+ break;
+
+ case SBSA_GWDT_WOR:
+ s->worl = data;
+ s->ws0 = false;
+ s->ws1 = false;
+ s->wcs &= ~SBSA_GWDT_WCS_WS0;
+ s->wcs &= ~SBSA_GWDT_WCS_WS1;
+ /*
+ * TODO:- setting woru to 0 and triggering update timer(below) is a
+ * temporary workaround to handle current linux driver which is
+ * based on earlier version of BSA specification.Once the linux
+ * driver is updated to BSA v0.9 will remove these next 2 lines.
+ */
+ s->woru = 0;
+ sbsa_gwdt_update_timer(s);
+ break;
+
+ case SBSA_GWDT_WORU:
+ s->woru = data;
+ s->ws0 = false;
+ s->ws1 = false;
+ s->wcs &= ~SBSA_GWDT_WCS_WS0;
+ s->wcs &= ~SBSA_GWDT_WCS_WS1;
+ sbsa_gwdt_update_timer(s);
+ break;
+
+ case SBSA_GWDT_WCV:
+ s->wcvl = data;
+ break;
+
+ case SBSA_GWDT_WCVU:
+ s->wcvu = data;
+ break;
+
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR, "bad address in control frame write :"
+ " 0x%x\n", (int)offset);
+ }
+ return;
+}
+
+static void wdt_sbsa_gwdt_reset(DeviceState *dev)
+{
+ SBSA_GWDTState *s = SBSA_GWDT(dev);
+
+ timer_del(s->ptimer);
+ timer_del(s->timer);
+
+ s->enabled = false;
+ s->ws0 = false;
+ s->ws1 = false;
+ s->wcs &= ~SBSA_GWDT_WCS_EN;
+ s->wcs &= ~SBSA_GWDT_WCS_WS0;
+ s->wcs &= ~SBSA_GWDT_WCS_WS1;
+ s->wcvl = 0;
+ s->wcvu = 0;
+ s->worl = 0;
+ s->woru = 0;
+ s->id = SBSA_GWDT_ID;
+}
+
+static void sbsa_gwdt_reset(void *opaque)
+{
+ DeviceState *sbsa_gwdt = opaque;
+
+ wdt_sbsa_gwdt_reset(sbsa_gwdt);
+}
+
+static void sbsa_gwdt_timer_sysinterrupt(void *opaque)
+{
+ SBSA_GWDTState *s = SBSA_GWDT(opaque);
+
+ s->wcs |= SBSA_GWDT_WCS_WS0;
+ s->ws0 = true;
+ qemu_set_irq(s->irq, 1);
+ sbsa_gwdt_update_timer(s);
+}
+
+static void sbsa_gwdt_timer_sysreset(void *dev)
+{
+ SBSA_GWDTState *s = SBSA_GWDT(dev);
+
+ s->wcs |= SBSA_GWDT_WCS_WS1;
+ s->ws1 = true;
+ qemu_log_mask(CPU_LOG_RESET, "Watchdog timer expired.\n");
+ /*
+ * Reset the watchdog only if the guest gets notified about
+ * expiry. watchdog_perform_action() may temporarily relinquish
+ * the BQL; reset before triggering the action to avoid races with
+ * sbsa_gwdt instructions.
+ */
+ switch (get_watchdog_action()) {
+ case WATCHDOG_ACTION_DEBUG:
+ case WATCHDOG_ACTION_NONE:
+ case WATCHDOG_ACTION_PAUSE:
+ break;
+ default:
+ wdt_sbsa_gwdt_reset(dev);
+ }
+ watchdog_perform_action();
+}
+
+static const MemoryRegionOps sbsa_gwdt_rops = {
+ .read = sbsa_gwdt_rread,
+ .write = sbsa_gwdt_rwrite,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+ .valid.min_access_size = 4,
+ .valid.max_access_size = 4,
+ .valid.unaligned = false,
+};
+
+static const MemoryRegionOps sbsa_gwdt_ops = {
+ .read = sbsa_gwdt_read,
+ .write = sbsa_gwdt_write,
+ .endianness = DEVICE_LITTLE_ENDIAN,
+ .valid.min_access_size = 4,
+ .valid.max_access_size = 4,
+ .valid.unaligned = false,
+};
+
+static void wdt_sbsa_gwdt_realize(DeviceState *dev, Error **errp)
+{
+ SBSA_GWDTState *s = SBSA_GWDT(dev);
+ SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
+
+ memory_region_init_io(&s->rmmio, OBJECT(dev),
+ &sbsa_gwdt_rops, s,
+ "sbsa_gwdt.refresh",
+ SBSA_GWDT_RMMIO_SIZE);
+
+ memory_region_init_io(&s->cmmio, OBJECT(dev),
+ &sbsa_gwdt_ops, s,
+ "sbsa_gwdt.control",
+ SBSA_GWDT_CMMIO_SIZE);
+
+ sysbus_init_mmio(sbd, &s->rmmio);
+ sysbus_init_mmio(sbd, &s->cmmio);
+
+ sysbus_init_irq(sbd, &s->irq);
+
+ qemu_register_reset(sbsa_gwdt_reset, s);
+
+ s->ptimer = timer_new_ns(QEMU_CLOCK_VIRTUAL, sbsa_gwdt_timer_sysinterrupt,
+ dev);
+ s->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, sbsa_gwdt_timer_sysreset,
+ dev);
+}
+
+static void wdt_sbsa_gwdt_unrealize(DeviceState *dev)
+{
+ SBSA_GWDTState *s = SBSA_GWDT(dev);
+
+ timer_del(s->ptimer);
+ timer_free(s->ptimer);
+
+ timer_del(s->timer);
+ timer_free(s->timer);
+}
+
+static void wdt_sbsa_gwdt_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->realize = wdt_sbsa_gwdt_realize;
+ dc->unrealize = wdt_sbsa_gwdt_unrealize;
+ dc->reset = wdt_sbsa_gwdt_reset;
+ dc->hotpluggable = false;
+ set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+ dc->vmsd = &vmstate_sbsa_gwdt;
+}
+
+static const TypeInfo wdt_sbsa_gwdt_info = {
+ .class_init = wdt_sbsa_gwdt_class_init,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .name = TYPE_WDT_SBSA_GWDT,
+ .instance_size = sizeof(SBSA_GWDTState),
+};
+
+static void wdt_sbsa_gwdt_register_types(void)
+{
+ watchdog_add_model(&model);
+ type_register_static(&wdt_sbsa_gwdt_info);
+}
+
+type_init(wdt_sbsa_gwdt_register_types)
diff --git a/include/hw/watchdog/wdt_sbsa_gwdt.h
b/include/hw/watchdog/wdt_sbsa_gwdt.h
new file mode 100644
index 000000000000..70ba7abb3ace
--- /dev/null
+++ b/include/hw/watchdog/wdt_sbsa_gwdt.h
@@ -0,0 +1,70 @@
+#ifndef WDT_SBSA_GWDT_H
+#define WDT_SBSA_GWDT_H
+
+#include "qemu/bitops.h"
+#include "hw/sysbus.h"
+#include "hw/irq.h"
+
+#define TYPE_WDT_SBSA_GWDT "sbsa_gwdt"
+#define SBSA_GWDT(obj) \
+ OBJECT_CHECK(SBSA_GWDTState, (obj), TYPE_WDT_SBSA_GWDT)
+#define SBSA_GWDT_CLASS(klass) \
+ OBJECT_CLASS_CHECK(SBSA_GWDTClass, (klass), TYPE_WDT_SBSA_GWDT)
+#define SBSA_GWDT_GET_CLASS(obj) \
+ OBJECT_GET_CLASS(SBSA_GWDTClass, (obj), TYPE_WDT_SBSA_GWDT)
+
+/* SBSA Generic Watchdog register definitions */
+/* refresh frame */
+#define SBSA_GWDT_WRR 0x000
+
+/* control frame */
+#define SBSA_GWDT_WCS 0x000
+#define SBSA_GWDT_WOR 0x008
+#define SBSA_GWDT_WORU 0x00C
+#define SBSA_GWDT_WCV 0x010
+#define SBSA_GWDT_WCVU 0x014
+
+/* Watchdog Interface Identification Register */
+#define SBSA_GWDT_W_IIDR 0xFCC
+
+/* Watchdog Control and Status Register Bits */
+#define SBSA_GWDT_WCS_EN BIT(0)
+#define SBSA_GWDT_WCS_WS0 BIT(1)
+#define SBSA_GWDT_WCS_WS1 BIT(2)
+
+#define SBSA_GWDT_WOR_MASK 0x0000FFFF
+
+/* Watchdog Interface Identification Register definition*/
+#define SBSA_GWDT_ID 0x1043B
+
+/* 2 Separate memory regions for each of refresh & control register frames */
+#define SBSA_GWDT_RMMIO_SIZE 0x1000
+#define SBSA_GWDT_CMMIO_SIZE 0x1000
+
+#define SBSA_TIMER_FREQ 62500000 /* Hz */
+
+typedef struct SBSA_GWDTState {
+ /* <private> */
+ SysBusDevice parent_obj;
+
+ /*< public >*/
+ MemoryRegion rmmio;
+ MemoryRegion cmmio;
+ qemu_irq irq;
+
+ QEMUTimer *ptimer, *timer;
+
+ uint32_t id;
+ uint32_t wrr;
+ uint32_t wcs;
+ uint32_t worl;
+ uint32_t woru;
+ uint32_t wcvl;
+ uint32_t wcvu;
+ bool enabled;
+ bool ws0, ws1;
+
+ /*< public >*/
+} SBSA_GWDTState;
+
+#endif /* WDT_SBSA_GWDT_H */
--
2.18.4