diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c')
-rw-r--r-- | drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c b/drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c new file mode 100644 index 000000000000..49976be4d73b --- /dev/null +++ b/drivers/gpu/drm/nouveau/core/subdev/timer/nv04.c @@ -0,0 +1,249 @@ +/* + * 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 <subdev/timer.h> + +#define NV04_PTIMER_INTR_0 0x009100 +#define NV04_PTIMER_INTR_EN_0 0x009140 +#define NV04_PTIMER_NUMERATOR 0x009200 +#define NV04_PTIMER_DENOMINATOR 0x009210 +#define NV04_PTIMER_TIME_0 0x009400 +#define NV04_PTIMER_TIME_1 0x009410 +#define NV04_PTIMER_ALARM_0 0x009420 + +struct nv04_timer_priv { + struct nouveau_timer base; + struct list_head alarms; + spinlock_t lock; +}; + +static u64 +nv04_timer_read(struct nouveau_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 nouveau_timer *ptimer) +{ + struct nv04_timer_priv *priv = (void *)ptimer; + struct nouveau_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(&alarm->head); + alarm->func(alarm); + } +} + +static void +nv04_timer_alarm(struct nouveau_timer *ptimer, u32 time, + struct nouveau_alarm *alarm) +{ + struct nv04_timer_priv *priv = (void *)ptimer; + struct nouveau_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); + 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_intr(struct nouveau_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); + } +} + +static int +nv04_timer_ctor(struct nouveau_object *parent, struct nouveau_object *engine, + struct nouveau_oclass *oclass, void *data, u32 size, + struct nouveau_object **pobject) +{ + struct nv04_timer_priv *priv; + int ret; + + ret = nouveau_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; + + INIT_LIST_HEAD(&priv->alarms); + spin_lock_init(&priv->lock); + return 0; +} + +static void +nv04_timer_dtor(struct nouveau_object *object) +{ + struct nv04_timer_priv *priv = (void *)object; + return nouveau_timer_destroy(&priv->base); +} + +static int +nv04_timer_init(struct nouveau_object *object) +{ + struct nouveau_device *device = nv_device(object); + struct nv04_timer_priv *priv = (void *)object; + u32 m = 1, f, n, d; + int ret; + + ret = nouveau_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 = nouveau_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; + } + + 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_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); + return 0; +} + +static int +nv04_timer_fini(struct nouveau_object *object, bool suspend) +{ + struct nv04_timer_priv *priv = (void *)object; + nv_wr32(priv, NV04_PTIMER_INTR_EN_0, 0x00000000); + return nouveau_timer_fini(&priv->base, suspend); +} + +struct nouveau_oclass +nv04_timer_oclass = { + .handle = NV_SUBDEV(TIMER, 0x04), + .ofuncs = &(struct nouveau_ofuncs) { + .ctor = nv04_timer_ctor, + .dtor = nv04_timer_dtor, + .init = nv04_timer_init, + .fini = nv04_timer_fini, + } +}; |