drivers/gpu/drm/nouveau/nvkm/subdev/pmu/base.c

   1 /*
   2  * Copyright 2013 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 <subdev/timer.h>
  27
  28 void
  29 nvkm_pmu_pgob(struct nvkm_pmu *pmu, bool enable)
  30 {
  31         if (pmu && pmu->func->pgob)
  32                 pmu->func->pgob(pmu, enable);
  33 }
  34
  35 static void
  36 nvkm_pmu_recv(struct work_struct *work)
  37 {
  38         struct nvkm_pmu *pmu = container_of(work, typeof(*pmu), recv.work);
  39         return pmu->func->recv(pmu);
  40 }
  41
  42 int
  43 nvkm_pmu_send(struct nvkm_pmu *pmu, u32 reply[2],
  44               u32 process, u32 message, u32 data0, u32 data1)
  45 {
  46         if (!pmu || !pmu->func->send)
  47                 return -ENODEV;
  48         return pmu->func->send(pmu, reply, process, message, data0, data1);
  49 }
  50
  51 static void
  52 nvkm_pmu_intr(struct nvkm_subdev *subdev)
  53 {
  54         struct nvkm_pmu *pmu = nvkm_pmu(subdev);
  55         if (!pmu->func->intr)
  56                 return;
  57         pmu->func->intr(pmu);
  58 }
  59
  60 static int
  61 nvkm_pmu_fini(struct nvkm_subdev *subdev, bool suspend)
  62 {
  63         struct nvkm_pmu *pmu = nvkm_pmu(subdev);
  64
  65         if (pmu->func->fini)
  66                 pmu->func->fini(pmu);
  67
  68         flush_work(&pmu->recv.work);
  69         return 0;
  70 }
  71
  72 static int
  73 nvkm_pmu_reset(struct nvkm_pmu *pmu)
  74 {
  75         struct nvkm_device *device = pmu->subdev.device;
  76
  77         if (!(nvkm_rd32(device, 0x000200) & 0x00002000))
  78                 return 0;
  79
  80         /* Inhibit interrupts, and wait for idle. */
  81         nvkm_wr32(device, 0x10a014, 0x0000ffff);
  82         nvkm_msec(device, 2000,
  83                 if (!nvkm_rd32(device, 0x10a04c))
  84                         break;
  85         );
  86
  87         /* Reset. */
  88         pmu->func->reset(pmu);
  89
  90         /* Wait for IMEM/DMEM scrubbing to be complete. */
  91         nvkm_msec(device, 2000,
  92                 if (!(nvkm_rd32(device, 0x10a10c) & 0x00000006))
  93                         break;
  94         );
  95
  96         return 0;
  97 }
  98
  99 static int
 100 nvkm_pmu_preinit(struct nvkm_subdev *subdev)
 101 {
 102         struct nvkm_pmu *pmu = nvkm_pmu(subdev);
 103         return nvkm_pmu_reset(pmu);
 104 }
 105
 106 static int
 107 nvkm_pmu_init(struct nvkm_subdev *subdev)
 108 {
 109         struct nvkm_pmu *pmu = nvkm_pmu(subdev);
 110         int ret = nvkm_pmu_reset(pmu);
 111         if (ret == 0 && pmu->func->init)
 112                 ret = pmu->func->init(pmu);
 113         return ret;
 114 }
 115
 116 static void *
 117 nvkm_pmu_dtor(struct nvkm_subdev *subdev)
 118 {
 119         return nvkm_pmu(subdev);
 120 }
 121
 122 static const struct nvkm_subdev_func
 123 nvkm_pmu = {
 124         .dtor = nvkm_pmu_dtor,
 125         .preinit = nvkm_pmu_preinit,
 126         .init = nvkm_pmu_init,
 127         .fini = nvkm_pmu_fini,
 128         .intr = nvkm_pmu_intr,
 129 };
 130
 131 int
 132 nvkm_pmu_new_(const struct nvkm_pmu_func *func, struct nvkm_device *device,
 133               int index, struct nvkm_pmu **ppmu)
 134 {
 135         struct nvkm_pmu *pmu;
 136         if (!(pmu = *ppmu = kzalloc(sizeof(*pmu), GFP_KERNEL)))
 137                 return -ENOMEM;
 138         nvkm_subdev_ctor(&nvkm_pmu, device, index, &pmu->subdev);
 139         pmu->func = func;
 140         INIT_WORK(&pmu->recv.work, nvkm_pmu_recv);
 141         init_waitqueue_head(&pmu->recv.wait);
 142         return 0;
 143 }