--- /dev/null
+/*
+ * Copyright 2012 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Ben Skeggs
+ */
+#include "nv04.h"
+
+#include <core/device.h>
+
+static u64
+nv04_timer_read(struct nvkm_timer *ptimer)
+{
+ struct nv04_timer_priv *priv = (void *)ptimer;
+ u32 hi, lo;
+
+ do {
+ hi = nv_rd32(priv, NV04_PTIMER_TIME_1);
+ lo = nv_rd32(priv, NV04_PTIMER_TIME_0);
+ } while (hi != nv_rd32(priv, NV04_PTIMER_TIME_1));
+
+ return ((u64)hi << 32 | lo);
+}
+
+static void
+nv04_timer_alarm_trigger(struct nvkm_timer *ptimer)
+{
+ struct nv04_timer_priv *priv = (void *)ptimer;
+ struct nvkm_alarm *alarm, *atemp;
+ unsigned long flags;
+ LIST_HEAD(exec);
+
+ /* move any due alarms off the pending list */
+ spin_lock_irqsave(&priv->lock, flags);
+ list_for_each_entry_safe(alarm, atemp, &priv->alarms, head) {
+ if (alarm->timestamp <= ptimer->read(ptimer))
+ list_move_tail(&alarm->head, &exec);
+ }
+
+ /* reschedule interrupt for next alarm time */
+ if (!list_empty(&priv->alarms)) {
+ alarm = list_first_entry(&priv->alarms, typeof(*alarm), head);
+ nv_wr32(priv, NV04_PTIMER_ALARM_0, alarm->timestamp);
+ nv_wr32(priv, NV04_PTIMER_INTR_EN_0, 0x00000001);
+ } else {
+ nv_wr32(priv, NV04_PTIMER_INTR_EN_0, 0x00000000);
+ }
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ /* execute any pending alarm handlers */
+ list_for_each_entry_safe(alarm, atemp, &exec, head) {
+ list_del_init(&alarm->head);
+ alarm->func(alarm);
+ }
+}
+
+static void
+nv04_timer_alarm(struct nvkm_timer *ptimer, u64 time, struct nvkm_alarm *alarm)
+{
+ struct nv04_timer_priv *priv = (void *)ptimer;
+ struct nvkm_alarm *list;
+ unsigned long flags;
+
+ alarm->timestamp = ptimer->read(ptimer) + time;
+
+ /* append new alarm to list, in soonest-alarm-first order */
+ spin_lock_irqsave(&priv->lock, flags);
+ if (!time) {
+ if (!list_empty(&alarm->head))
+ list_del(&alarm->head);
+ } else {
+ list_for_each_entry(list, &priv->alarms, head) {
+ if (list->timestamp > alarm->timestamp)
+ break;
+ }
+ list_add_tail(&alarm->head, &list->head);
+ }
+ spin_unlock_irqrestore(&priv->lock, flags);
+
+ /* process pending alarms */
+ nv04_timer_alarm_trigger(ptimer);
+}
+
+static void
+nv04_timer_alarm_cancel(struct nvkm_timer *ptimer, struct nvkm_alarm *alarm)
+{
+ struct nv04_timer_priv *priv = (void *)ptimer;
+ unsigned long flags;
+ spin_lock_irqsave(&priv->lock, flags);
+ list_del_init(&alarm->head);
+ spin_unlock_irqrestore(&priv->lock, flags);
+}
+
+static void
+nv04_timer_intr(struct nvkm_subdev *subdev)
+{
+ struct nv04_timer_priv *priv = (void *)subdev;
+ u32 stat = nv_rd32(priv, NV04_PTIMER_INTR_0);
+
+ if (stat & 0x00000001) {
+ nv04_timer_alarm_trigger(&priv->base);
+ nv_wr32(priv, NV04_PTIMER_INTR_0, 0x00000001);
+ stat &= ~0x00000001;
+ }
+
+ if (stat) {
+ nv_error(priv, "unknown stat 0x%08x\n", stat);
+ nv_wr32(priv, NV04_PTIMER_INTR_0, stat);
+ }
+}
+
+int
+nv04_timer_fini(struct nvkm_object *object, bool suspend)
+{
+ struct nv04_timer_priv *priv = (void *)object;
+ if (suspend)
+ priv->suspend_time = nv04_timer_read(&priv->base);
+ nv_wr32(priv, NV04_PTIMER_INTR_EN_0, 0x00000000);
+ return nvkm_timer_fini(&priv->base, suspend);
+}
+
+static int
+nv04_timer_init(struct nvkm_object *object)
+{
+ struct nvkm_device *device = nv_device(object);
+ struct nv04_timer_priv *priv = (void *)object;
+ u32 m = 1, f, n, d, lo, hi;
+ int ret;
+
+ ret = nvkm_timer_init(&priv->base);
+ if (ret)
+ return ret;
+
+ /* aim for 31.25MHz, which gives us nanosecond timestamps */
+ d = 1000000 / 32;
+
+ /* determine base clock for timer source */
+#if 0 /*XXX*/
+ if (device->chipset < 0x40) {
+ n = nvkm_hw_get_clock(device, PLL_CORE);
+ } else
+#endif
+ if (device->chipset <= 0x40) {
+ /*XXX: figure this out */
+ f = -1;
+ n = 0;
+ } else {
+ f = device->crystal;
+ n = f;
+ while (n < (d * 2)) {
+ n += (n / m);
+ m++;
+ }
+
+ nv_wr32(priv, 0x009220, m - 1);
+ }
+
+ if (!n) {
+ nv_warn(priv, "unknown input clock freq\n");
+ if (!nv_rd32(priv, NV04_PTIMER_NUMERATOR) ||
+ !nv_rd32(priv, NV04_PTIMER_DENOMINATOR)) {
+ nv_wr32(priv, NV04_PTIMER_NUMERATOR, 1);
+ nv_wr32(priv, NV04_PTIMER_DENOMINATOR, 1);
+ }
+ return 0;
+ }
+
+ /* reduce ratio to acceptable values */
+ while (((n % 5) == 0) && ((d % 5) == 0)) {
+ n /= 5;
+ d /= 5;
+ }
+
+ while (((n % 2) == 0) && ((d % 2) == 0)) {
+ n /= 2;
+ d /= 2;
+ }
+
+ while (n > 0xffff || d > 0xffff) {
+ n >>= 1;
+ d >>= 1;
+ }
+
+ /* restore the time before suspend */
+ lo = priv->suspend_time;
+ hi = (priv->suspend_time >> 32);
+
+ nv_debug(priv, "input frequency : %dHz\n", f);
+ nv_debug(priv, "input multiplier: %d\n", m);
+ nv_debug(priv, "numerator : 0x%08x\n", n);
+ nv_debug(priv, "denominator : 0x%08x\n", d);
+ nv_debug(priv, "timer frequency : %dHz\n", (f * m) * d / n);
+ nv_debug(priv, "time low : 0x%08x\n", lo);
+ nv_debug(priv, "time high : 0x%08x\n", hi);
+
+ nv_wr32(priv, NV04_PTIMER_NUMERATOR, n);
+ nv_wr32(priv, NV04_PTIMER_DENOMINATOR, d);
+ nv_wr32(priv, NV04_PTIMER_INTR_0, 0xffffffff);
+ nv_wr32(priv, NV04_PTIMER_INTR_EN_0, 0x00000000);
+ nv_wr32(priv, NV04_PTIMER_TIME_1, hi);
+ nv_wr32(priv, NV04_PTIMER_TIME_0, lo);
+ return 0;
+}
+
+void
+nv04_timer_dtor(struct nvkm_object *object)
+{
+ struct nv04_timer_priv *priv = (void *)object;
+ return nvkm_timer_destroy(&priv->base);
+}
+
+int
+nv04_timer_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
+ struct nvkm_oclass *oclass, void *data, u32 size,
+ struct nvkm_object **pobject)
+{
+ struct nv04_timer_priv *priv;
+ int ret;
+
+ ret = nvkm_timer_create(parent, engine, oclass, &priv);
+ *pobject = nv_object(priv);
+ if (ret)
+ return ret;
+
+ priv->base.base.intr = nv04_timer_intr;
+ priv->base.read = nv04_timer_read;
+ priv->base.alarm = nv04_timer_alarm;
+ priv->base.alarm_cancel = nv04_timer_alarm_cancel;
+ priv->suspend_time = 0;
+
+ INIT_LIST_HEAD(&priv->alarms);
+ spin_lock_init(&priv->lock);
+ return 0;
+}
+
+struct nvkm_oclass
+nv04_timer_oclass = {
+ .handle = NV_SUBDEV(TIMER, 0x04),
+ .ofuncs = &(struct nvkm_ofuncs) {
+ .ctor = nv04_timer_ctor,
+ .dtor = nv04_timer_dtor,
+ .init = nv04_timer_init,
+ .fini = nv04_timer_fini,
+ }
+};
Code Review / kvmfornfv.git / blobdiff