diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/timer/nv04.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/timer/nv04.c | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/timer/nv04.c b/drivers/gpu/drm/nouveau/nvkm/subdev/timer/nv04.c new file mode 100644 index 000000000..7f48249f4 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/timer/nv04.c @@ -0,0 +1,151 @@ +/* + * 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 "priv.h" +#include "regsnv04.h" + +void +nv04_timer_time(struct nvkm_timer *tmr, u64 time) +{ + struct nvkm_subdev *subdev = &tmr->subdev; + struct nvkm_device *device = subdev->device; + u32 hi = upper_32_bits(time); + u32 lo = lower_32_bits(time); + + nvkm_debug(subdev, "time low : %08x\n", lo); + nvkm_debug(subdev, "time high : %08x\n", hi); + + nvkm_wr32(device, NV04_PTIMER_TIME_1, hi); + nvkm_wr32(device, NV04_PTIMER_TIME_0, lo); +} + +u64 +nv04_timer_read(struct nvkm_timer *tmr) +{ + struct nvkm_device *device = tmr->subdev.device; + u32 hi, lo; + + do { + hi = nvkm_rd32(device, NV04_PTIMER_TIME_1); + lo = nvkm_rd32(device, NV04_PTIMER_TIME_0); + } while (hi != nvkm_rd32(device, NV04_PTIMER_TIME_1)); + + return ((u64)hi << 32 | lo); +} + +void +nv04_timer_alarm_fini(struct nvkm_timer *tmr) +{ + struct nvkm_device *device = tmr->subdev.device; + nvkm_wr32(device, NV04_PTIMER_INTR_EN_0, 0x00000000); +} + +void +nv04_timer_alarm_init(struct nvkm_timer *tmr, u32 time) +{ + struct nvkm_device *device = tmr->subdev.device; + nvkm_wr32(device, NV04_PTIMER_ALARM_0, time); + nvkm_wr32(device, NV04_PTIMER_INTR_EN_0, 0x00000001); +} + +void +nv04_timer_intr(struct nvkm_timer *tmr) +{ + struct nvkm_subdev *subdev = &tmr->subdev; + struct nvkm_device *device = subdev->device; + u32 stat = nvkm_rd32(device, NV04_PTIMER_INTR_0); + + if (stat & 0x00000001) { + nvkm_wr32(device, NV04_PTIMER_INTR_0, 0x00000001); + nvkm_timer_alarm_trigger(tmr); + stat &= ~0x00000001; + } + + if (stat) { + nvkm_error(subdev, "intr %08x\n", stat); + nvkm_wr32(device, NV04_PTIMER_INTR_0, stat); + } +} + +static void +nv04_timer_init(struct nvkm_timer *tmr) +{ + struct nvkm_subdev *subdev = &tmr->subdev; + struct nvkm_device *device = subdev->device; + u32 f = 0; /*XXX: nvclk */ + u32 n, d; + + /* aim for 31.25MHz, which gives us nanosecond timestamps */ + d = 1000000 / 32; + n = f; + + if (!f) { + n = nvkm_rd32(device, NV04_PTIMER_NUMERATOR); + d = nvkm_rd32(device, NV04_PTIMER_DENOMINATOR); + if (!n || !d) { + n = 1; + d = 1; + } + nvkm_warn(subdev, "unknown input clock freq\n"); + } + + /* 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; + } + + nvkm_debug(subdev, "input frequency : %dHz\n", f); + nvkm_debug(subdev, "numerator : %08x\n", n); + nvkm_debug(subdev, "denominator : %08x\n", d); + nvkm_debug(subdev, "timer frequency : %dHz\n", f * d / n); + + nvkm_wr32(device, NV04_PTIMER_NUMERATOR, n); + nvkm_wr32(device, NV04_PTIMER_DENOMINATOR, d); +} + +static const struct nvkm_timer_func +nv04_timer = { + .init = nv04_timer_init, + .intr = nv04_timer_intr, + .read = nv04_timer_read, + .time = nv04_timer_time, + .alarm_init = nv04_timer_alarm_init, + .alarm_fini = nv04_timer_alarm_fini, +}; + +int +nv04_timer_new(struct nvkm_device *device, int index, struct nvkm_timer **ptmr) +{ + return nvkm_timer_new_(&nv04_timer, device, index, ptmr); +} |