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/*
* 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"
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,
}
};
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