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authorGuenter Roeck <linux@roeck-us.net>2020-05-17 09:21:28 -0700
committerPeter Maydell <peter.maydell@linaro.org>2020-05-21 20:00:18 +0100
commit37f95959c730ff29f58c85b7a98f0b825933bee1 (patch)
tree6ece7d04ffca5c1380d57d2f7f2fe9a979cc5959 /hw/watchdog/wdt_imx2.c
parentef81aa68a708ba5162e1d5fa8d98171ac1059e2d (diff)
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hw: Move i.MX watchdog driver to hw/watchdog
In preparation for a full implementation, move i.MX watchdog driver from hw/misc to hw/watchdog. While at it, add the watchdog files to MAINTAINERS. Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Message-id: 20200517162135.110364-2-linux@roeck-us.net Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw/watchdog/wdt_imx2.c')
-rw-r--r--hw/watchdog/wdt_imx2.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/hw/watchdog/wdt_imx2.c b/hw/watchdog/wdt_imx2.c
new file mode 100644
index 0000000..ad1ef02
--- /dev/null
+++ b/hw/watchdog/wdt_imx2.c
@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2018, Impinj, Inc.
+ *
+ * i.MX2 Watchdog IP block
+ *
+ * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/bitops.h"
+#include "qemu/module.h"
+#include "sysemu/watchdog.h"
+
+#include "hw/watchdog/wdt_imx2.h"
+
+#define IMX2_WDT_WCR_WDA BIT(5) /* -> External Reset WDOG_B */
+#define IMX2_WDT_WCR_SRS BIT(4) /* -> Software Reset Signal */
+
+static uint64_t imx2_wdt_read(void *opaque, hwaddr addr,
+ unsigned int size)
+{
+ return 0;
+}
+
+static void imx2_wdt_write(void *opaque, hwaddr addr,
+ uint64_t value, unsigned int size)
+{
+ if (addr == IMX2_WDT_WCR &&
+ (~value & (IMX2_WDT_WCR_WDA | IMX2_WDT_WCR_SRS))) {
+ watchdog_perform_action();
+ }
+}
+
+static const MemoryRegionOps imx2_wdt_ops = {
+ .read = imx2_wdt_read,
+ .write = imx2_wdt_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+ .impl = {
+ /*
+ * Our device would not work correctly if the guest was doing
+ * unaligned access. This might not be a limitation on the
+ * real device but in practice there is no reason for a guest
+ * to access this device unaligned.
+ */
+ .min_access_size = 4,
+ .max_access_size = 4,
+ .unaligned = false,
+ },
+};
+
+static void imx2_wdt_realize(DeviceState *dev, Error **errp)
+{
+ IMX2WdtState *s = IMX2_WDT(dev);
+
+ memory_region_init_io(&s->mmio, OBJECT(dev),
+ &imx2_wdt_ops, s,
+ TYPE_IMX2_WDT".mmio",
+ IMX2_WDT_REG_NUM * sizeof(uint16_t));
+ sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->mmio);
+}
+
+static void imx2_wdt_class_init(ObjectClass *klass, void *data)
+{
+ DeviceClass *dc = DEVICE_CLASS(klass);
+
+ dc->realize = imx2_wdt_realize;
+ set_bit(DEVICE_CATEGORY_MISC, dc->categories);
+}
+
+static const TypeInfo imx2_wdt_info = {
+ .name = TYPE_IMX2_WDT,
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(IMX2WdtState),
+ .class_init = imx2_wdt_class_init,
+};
+
+static WatchdogTimerModel model = {
+ .wdt_name = "imx2-watchdog",
+ .wdt_description = "i.MX2 Watchdog",
+};
+
+static void imx2_wdt_register_type(void)
+{
+ watchdog_add_model(&model);
+ type_register_static(&imx2_wdt_info);
+}
+type_init(imx2_wdt_register_type)