cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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nv40.c (2650B)

      1/*
      2 * Copyright 2012 Red Hat Inc.
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the "Software"),
      6 * to deal in the Software without restriction, including without limitation
      7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8 * and/or sell copies of the Software, and to permit persons to whom the
      9 * Software is furnished to do so, subject to the following conditions:
     10 *
     11 * The above copyright notice and this permission notice shall be included in
     12 * all copies or substantial portions of the Software.
     13 *
     14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20 * OTHER DEALINGS IN THE SOFTWARE.
     21 *
     22 * Authors: Ben Skeggs
     23 */
     24#include "priv.h"
     25#include "regsnv04.h"
     26
     27static void
     28nv40_timer_init(struct nvkm_timer *tmr)
     29{
     30	struct nvkm_subdev *subdev = &tmr->subdev;
     31	struct nvkm_device *device = subdev->device;
     32	u32 f = 0; /*XXX: figure this out */
     33	u32 n, d;
     34
     35	/* aim for 31.25MHz, which gives us nanosecond timestamps */
     36	d = 1000000 / 32;
     37	n = f;
     38
     39	if (!f) {
     40		n = nvkm_rd32(device, NV04_PTIMER_NUMERATOR);
     41		d = nvkm_rd32(device, NV04_PTIMER_DENOMINATOR);
     42		if (!n || !d) {
     43			n = 1;
     44			d = 1;
     45		}
     46		nvkm_warn(subdev, "unknown input clock freq\n");
     47	}
     48
     49	/* reduce ratio to acceptable values */
     50	while (((n % 5) == 0) && ((d % 5) == 0)) {
     51		n /= 5;
     52		d /= 5;
     53	}
     54
     55	while (((n % 2) == 0) && ((d % 2) == 0)) {
     56		n /= 2;
     57		d /= 2;
     58	}
     59
     60	while (n > 0xffff || d > 0xffff) {
     61		n >>= 1;
     62		d >>= 1;
     63	}
     64
     65	nvkm_debug(subdev, "input frequency : %dHz\n", f);
     66	nvkm_debug(subdev, "numerator       : %08x\n", n);
     67	nvkm_debug(subdev, "denominator     : %08x\n", d);
     68	nvkm_debug(subdev, "timer frequency : %dHz\n", f * d / n);
     69
     70	nvkm_wr32(device, NV04_PTIMER_NUMERATOR, n);
     71	nvkm_wr32(device, NV04_PTIMER_DENOMINATOR, d);
     72}
     73
     74static const struct nvkm_timer_func
     75nv40_timer = {
     76	.init = nv40_timer_init,
     77	.intr = nv04_timer_intr,
     78	.read = nv04_timer_read,
     79	.time = nv04_timer_time,
     80	.alarm_init = nv04_timer_alarm_init,
     81	.alarm_fini = nv04_timer_alarm_fini,
     82};
     83
     84int
     85nv40_timer_new(struct nvkm_device *device, enum nvkm_subdev_type type, int inst,
     86	       struct nvkm_timer **ptmr)
     87{
     88	return nvkm_timer_new_(&nv40_timer, device, type, inst, ptmr);
     89}