1 files changed, 142 insertions, 0 deletions
diff --git a/hw/timer/mips_gictimer.c b/hw/timer/mips_gictimer.c
new file mode 100644
index 0000000000..3698889475
--- /dev/null
+++ b/hw/timer/mips_gictimer.c
@@ -0,0 +1,142 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (C) 2016 Imagination Technologies
+ */
+
+#include "qemu/osdep.h"
+#include "hw/hw.h"
+#include "hw/sysbus.h"
+#include "qemu/timer.h"
+#include "hw/timer/mips_gictimer.h"
+
+#define TIMER_PERIOD 10 /* 10 ns period for 100 Mhz frequency */
+
+static void gic_vptimer_update(MIPSGICTimerState *gictimer,
+                                   uint32_t vp_index, uint64_t now)
+{
+    uint64_t next;
+    uint32_t wait;
+
+    wait = gictimer->vptimers[vp_index].comparelo - gictimer->sh_counterlo -
+           (uint32_t)(now / TIMER_PERIOD);
+    next = now + (uint64_t)wait * TIMER_PERIOD;
+
+    timer_mod(gictimer->vptimers[vp_index].qtimer, next);
+}
+
+static void gic_vptimer_expire(MIPSGICTimerState *gictimer, uint32_t vp_index,
+                               uint64_t now)
+{
+    if (gictimer->countstop) {
+        /* timer stopped */
+        return;
+    }
+    gictimer->cb(gictimer->opaque, vp_index);
+    gic_vptimer_update(gictimer, vp_index, now);
+}
+
+static void gic_vptimer_cb(void *opaque)
+{
+    MIPSGICTimerVPState *vptimer = opaque;
+    MIPSGICTimerState *gictimer = vptimer->gictimer;
+    gic_vptimer_expire(gictimer, vptimer->vp_index,
+                       qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
+}
+
+uint32_t mips_gictimer_get_sh_count(MIPSGICTimerState *gictimer)
+{
+    int i;
+    if (gictimer->countstop) {
+        return gictimer->sh_counterlo;
+    } else {
+        uint64_t now;
+        now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+        for (i = 0; i < gictimer->num_vps; i++) {
+            if (timer_pending(gictimer->vptimers[i].qtimer)
+                && timer_expired(gictimer->vptimers[i].qtimer, now)) {
+                /* The timer has already expired.  */
+                gic_vptimer_expire(gictimer, i, now);
+            }
+        }
+        return gictimer->sh_counterlo + (uint32_t)(now / TIMER_PERIOD);
+    }
+}
+
+void mips_gictimer_store_sh_count(MIPSGICTimerState *gictimer, uint64_t count)
+{
+    int i;
+    uint64_t now;
+
+    if (gictimer->countstop || !gictimer->vptimers[0].qtimer) {
+        gictimer->sh_counterlo = count;
+    } else {
+        /* Store new count register */
+        now = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+        gictimer->sh_counterlo = count - (uint32_t)(now / TIMER_PERIOD);
+        /* Update timer timer */
+        for (i = 0; i < gictimer->num_vps; i++) {
+            gic_vptimer_update(gictimer, i, now);
+        }
+    }
+}
+
+uint32_t mips_gictimer_get_vp_compare(MIPSGICTimerState *gictimer,
+                                      uint32_t vp_index)
+{
+    return gictimer->vptimers[vp_index].comparelo;
+}
+
+void mips_gictimer_store_vp_compare(MIPSGICTimerState *gictimer,
+                                    uint32_t vp_index, uint64_t compare)
+{
+    gictimer->vptimers[vp_index].comparelo = (uint32_t) compare;
+    gic_vptimer_update(gictimer, vp_index,
+                       qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
+}
+
+uint8_t mips_gictimer_get_countstop(MIPSGICTimerState *gictimer)
+{
+    return gictimer->countstop;
+}
+
+void mips_gictimer_start_count(MIPSGICTimerState *gictimer)
+{
+    gictimer->countstop = 0;
+    mips_gictimer_store_sh_count(gictimer, gictimer->sh_counterlo);
+}
+
+void mips_gictimer_stop_count(MIPSGICTimerState *gictimer)
+{
+    int i;
+
+    gictimer->countstop = 1;
+    /* Store the current value */
+    gictimer->sh_counterlo +=
+        (uint32_t)(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) / TIMER_PERIOD);
+    for (i = 0; i < gictimer->num_vps; i++) {
+        timer_del(gictimer->vptimers[i].qtimer);
+    }
+}
+
+MIPSGICTimerState *mips_gictimer_init(void *opaque, uint32_t nvps,
+                                      MIPSGICTimerCB *cb)
+{
+    int i;
+    MIPSGICTimerState *gictimer = g_new(MIPSGICTimerState, 1);
+    gictimer->vptimers = g_new(MIPSGICTimerVPState, nvps);
+    gictimer->countstop = 1;
+    gictimer->num_vps = nvps;
+    gictimer->opaque = opaque;
+    gictimer->cb = cb;
+    for (i = 0; i < nvps; i++) {
+        gictimer->vptimers[i].gictimer = gictimer;
+        gictimer->vptimers[i].vp_index = i;
+        gictimer->vptimers[i].qtimer = timer_new_ns(QEMU_CLOCK_VIRTUAL,
+                                            &gic_vptimer_cb,
+                                            &gictimer->vptimers[i]);
+    }
+    return gictimer;
+}