LXR linux/drivers/gpu/drm/nouveau/nvkm/subdev/mc/base.c

   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
  26#include <core/option.h>
  27
  28void
  29nvkm_mc_unk260(struct nvkm_mc *mc, u32 data)
  30{
  31        if (mc->func->unk260)
  32                mc->func->unk260(mc, data);
  33}
  34
  35void
  36nvkm_mc_intr_unarm(struct nvkm_mc *mc)
  37{
  38        return mc->func->intr_unarm(mc);
  39}
  40
  41void
  42nvkm_mc_intr_rearm(struct nvkm_mc *mc)
  43{
  44        return mc->func->intr_rearm(mc);
  45}
  46
  47static u32
  48nvkm_mc_intr_mask(struct nvkm_mc *mc)
  49{
  50        u32 intr = mc->func->intr_mask(mc);
  51        if (WARN_ON_ONCE(intr == 0xffffffff))
  52                intr = 0; /* likely fallen off the bus */
  53        return intr;
  54}
  55
  56void
  57nvkm_mc_intr(struct nvkm_mc *mc, bool *handled)
  58{
  59        struct nvkm_device *device = mc->subdev.device;
  60        struct nvkm_subdev *subdev;
  61        const struct nvkm_mc_intr *map = mc->func->intr;
  62        u32 stat, intr;
  63
  64        stat = intr = nvkm_mc_intr_mask(mc);
  65        while (map->stat) {
  66                if (intr & map->stat) {
  67                        subdev = nvkm_device_subdev(device, map->unit);
  68                        if (subdev)
  69                                nvkm_subdev_intr(subdev);
  70                        stat &= ~map->stat;
  71                }
  72                map++;
  73        }
  74
  75        if (stat)
  76                nvkm_error(&mc->subdev, "intr %08x\n", stat);
  77        *handled = intr != 0;
  78}
  79
  80static int
  81nvkm_mc_fini(struct nvkm_subdev *subdev, bool suspend)
  82{
  83        struct nvkm_mc *mc = nvkm_mc(subdev);
  84        nvkm_mc_intr_unarm(mc);
  85        return 0;
  86}
  87
  88static int
  89nvkm_mc_init(struct nvkm_subdev *subdev)
  90{
  91        struct nvkm_mc *mc = nvkm_mc(subdev);
  92        if (mc->func->init)
  93                mc->func->init(mc);
  94        nvkm_mc_intr_rearm(mc);
  95        return 0;
  96}
  97
  98static void *
  99nvkm_mc_dtor(struct nvkm_subdev *subdev)
 100{
 101        return nvkm_mc(subdev);
 102}
 103
 104static const struct nvkm_subdev_func
 105nvkm_mc = {
 106        .dtor = nvkm_mc_dtor,
 107        .init = nvkm_mc_init,
 108        .fini = nvkm_mc_fini,
 109};
 110
 111int
 112nvkm_mc_new_(const struct nvkm_mc_func *func, struct nvkm_device *device,
 113             int index, struct nvkm_mc **pmc)
 114{
 115        struct nvkm_mc *mc;
 116
 117        if (!(mc = *pmc = kzalloc(sizeof(*mc), GFP_KERNEL)))
 118                return -ENOMEM;
 119
 120        nvkm_subdev_ctor(&nvkm_mc, device, index, 0, &mc->subdev);
 121        mc->func = func;
 122        return 0;
 123}
 124