Support for the RTC IO block on the imx23, enough to return
a valid date and make guest linux happy.
Signed-off-by: Michel Pollet <buser...@gmail.com>
---
hw/timer/Makefile.objs | 1 +
hw/timer/mxs_rtc.c | 147 +++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 148 insertions(+)
create mode 100644 hw/timer/mxs_rtc.c
diff --git a/hw/timer/Makefile.objs b/hw/timer/Makefile.objs
index 3ae091c..1003169 100644
--- a/hw/timer/Makefile.objs
+++ b/hw/timer/Makefile.objs
@@ -26,5 +26,6 @@ obj-$(CONFIG_OMAP) += omap_synctimer.o
obj-$(CONFIG_PXA2XX) += pxa2xx_timer.o
obj-$(CONFIG_SH4) += sh_timer.o
obj-$(CONFIG_TUSB6010) += tusb6010.o
+obj-$(CONFIG_MXS) += mxs_rtc.o
obj-$(CONFIG_MC146818RTC) += mc146818rtc.o
diff --git a/hw/timer/mxs_rtc.c b/hw/timer/mxs_rtc.c
new file mode 100644
index 0000000..628fade
--- /dev/null
+++ b/hw/timer/mxs_rtc.c
@@ -0,0 +1,147 @@
+/*
+ * mxs_rtc.c
+ *
+ * Copyright: Michel Pollet <buser...@gmail.com>
+ *
+ * QEMU Licence
+ */
+/*
+ * Implement the RTC block of the mxs. At least, the real time stuff.
+ * TODO Alarm, and watchdog ?
+ */
+
+#include "hw/sysbus.h"
+#include "hw/arm/mxs.h"
+
+#define D(w)
+
+enum {
+ RTC_CTRL = 0x0,
+ RTC_STAT = 0x1,
+ RTC_MS = 0x2,
+ RTC_SECONDS = 0x3,
+ RTC_ALARM = 0x4,
+ RTC_WATCHDOG = 0x5,
+ RTC_PERSISTENT0 = 0x6,
+ RTC_PERSISTENT1 = 0x7,
+ RTC_PERSISTENT2 = 0x8,
+ RTC_PERSISTENT3 = 0x9,
+ RTC_PERSISTENT4 = 0xa,
+ RTC_PERSISTENT5 = 0xa,
+ RTC_DEBUG = 0xc,
+ RTC_VERSION = 0xd,
+
+ RTC_MAX,
+};
+typedef struct mxs_rtc_state {
+ SysBusDevice busdev;
+ MemoryRegion iomem;
+ uint32_t base_ms, base_s;
+ uint32_t r[RTC_MAX];
+ qemu_irq alarm_irq;
+ CharDriverState *chr;
+} mxs_rtc_state;
+
+static uint64_t mxs_rtc_read(
+ void *opaque, hwaddr offset, unsigned size)
+{
+ mxs_rtc_state *s = (mxs_rtc_state *) opaque;
+ uint32_t res = 0;
+
+ D(printf("%s %04x (%d) = ", __func__, (int)offset, size);)
+ switch (offset >> 4) {
+ case 0 ... RTC_MAX:
+ if ((offset >> 4) == RTC_MS || (offset >> 4) == RTC_SECONDS) {
+ struct timeval tv;
+ gettimeofday(&tv, NULL);
+ s->r[RTC_MS] = (tv.tv_usec / 1000) - s->base_ms;
+ s->r[RTC_SECONDS] = tv.tv_sec - s->base_s;
+ }
+ res = s->r[offset >> 4];
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: bad offset 0x%x\n", __func__, (int) offset);
+ break;
+ }
+ D(printf("%08x\n", res);)
+
+ return res;
+}
+
+static void mxs_rtc_write(void *opaque, hwaddr offset,
+ uint64_t value, unsigned size)
+{
+ mxs_rtc_state *s = (mxs_rtc_state *) opaque;
+ uint32_t oldvalue = 0;
+
+ D(printf("%s %04x %08x(%d)\n", __func__, (int)offset, (int)value, size);)
+ switch (offset >> 4) {
+ case 0 ... RTC_MAX:
+ mxs_write(&s->r[offset >> 4], offset, value, size);
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "%s: bad offset 0x%x\n", __func__, (int) offset);
+ break;
+ }
+ switch (offset >> 4) {
+ case RTC_MS:
+ s->base_ms = s->r[RTC_MS];
+ break;
+ case RTC_SECONDS:
+ s->base_s = s->r[RTC_SECONDS];
+ break;
+ case RTC_CTRL:
+ if ((oldvalue ^ s->r[RTC_CTRL]) == 0x80000000
+ && !(oldvalue & 0x80000000)) {
+ D(printf("%s reseting, anding clockgate\n", __func__);)
+ s->r[RTC_CTRL] |= 0x40000000;
+ }
+ break;
+ }
+}
+
+static const MemoryRegionOps mxs_rtc_ops = {
+ .read = mxs_rtc_read,
+ .write = mxs_rtc_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static int mxs_rtc_init(SysBusDevice *dev)
+{
+ mxs_rtc_state *s = OBJECT_CHECK(mxs_rtc_state, dev, "mxs_rtc");
+
+ sysbus_init_irq(dev, &s->alarm_irq);
+ memory_region_init_io(&s->iomem, OBJECT(s), &mxs_rtc_ops, s,
+ "mxs_rtc", 0x2000);
+ sysbus_init_mmio(dev, &s->iomem);
+
+ s->r[RTC_CTRL] = 0xc0000000;
+ s->r[RTC_STAT] = 0xe80f0000;
+ s->r[RTC_VERSION] = 0x02000000;
+ // s->base_s = time(NULL);
+ return 0;
+}
+
+
+static void mxs_rtc_class_init(ObjectClass *klass, void *data)
+{
+ SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
+
+ sdc->init = mxs_rtc_init;
+}
+
+static TypeInfo rtc_info = {
+ .name = "mxs_rtc",
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(mxs_rtc_state),
+ .class_init = mxs_rtc_class_init,
+};
+
+static void mxs_rtc_register(void)
+{
+ type_register_static(&rtc_info);
+}
+
+type_init(mxs_rtc_register)
--
1.8.5.1
