kernel/drivers/gpu/drm/nouveau/nouveau_platform.c

   1 /*
   2  * Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
   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 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  18  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  19  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  20  * DEALINGS IN THE SOFTWARE.
  21  */
  22
  23 #include <linux/clk.h>
  24 #include <linux/io.h>
  25 #include <linux/module.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/of.h>
  28 #include <linux/reset.h>
  29 #include <linux/regulator/consumer.h>
  30 #include <linux/iommu.h>
  31 #include <soc/tegra/fuse.h>
  32 #include <soc/tegra/pmc.h>
  33
  34 #include "nouveau_drm.h"
  35 #include "nouveau_platform.h"
  36
  37 static int nouveau_platform_power_up(struct nouveau_platform_gpu *gpu)
  38 {
  39         int err;
  40
  41         err = regulator_enable(gpu->vdd);
  42         if (err)
  43                 goto err_power;
  44
  45         err = clk_prepare_enable(gpu->clk);
  46         if (err)
  47                 goto err_clk;
  48         err = clk_prepare_enable(gpu->clk_pwr);
  49         if (err)
  50                 goto err_clk_pwr;
  51         clk_set_rate(gpu->clk_pwr, 204000000);
  52         udelay(10);
  53
  54         reset_control_assert(gpu->rst);
  55         udelay(10);
  56
  57         err = tegra_powergate_remove_clamping(TEGRA_POWERGATE_3D);
  58         if (err)
  59                 goto err_clamp;
  60         udelay(10);
  61
  62         reset_control_deassert(gpu->rst);
  63         udelay(10);
  64
  65         return 0;
  66
  67 err_clamp:
  68         clk_disable_unprepare(gpu->clk_pwr);
  69 err_clk_pwr:
  70         clk_disable_unprepare(gpu->clk);
  71 err_clk:
  72         regulator_disable(gpu->vdd);
  73 err_power:
  74         return err;
  75 }
  76
  77 static int nouveau_platform_power_down(struct nouveau_platform_gpu *gpu)
  78 {
  79         int err;
  80
  81         reset_control_assert(gpu->rst);
  82         udelay(10);
  83
  84         clk_disable_unprepare(gpu->clk_pwr);
  85         clk_disable_unprepare(gpu->clk);
  86         udelay(10);
  87
  88         err = regulator_disable(gpu->vdd);
  89         if (err)
  90                 return err;
  91
  92         return 0;
  93 }
  94
  95 static void nouveau_platform_probe_iommu(struct device *dev,
  96                                          struct nouveau_platform_gpu *gpu)
  97 {
  98         int err;
  99         unsigned long pgsize_bitmap;
 100
 101         mutex_init(&gpu->iommu.mutex);
 102
 103         if (iommu_present(&platform_bus_type)) {
 104                 gpu->iommu.domain = iommu_domain_alloc(&platform_bus_type);
 105                 if (IS_ERR(gpu->iommu.domain))
 106                         goto error;
 107
 108                 /*
 109                  * A IOMMU is only usable if it supports page sizes smaller
 110                  * or equal to the system's PAGE_SIZE, with a preference if
 111                  * both are equal.
 112                  */
 113                 pgsize_bitmap = gpu->iommu.domain->ops->pgsize_bitmap;
 114                 if (pgsize_bitmap & PAGE_SIZE) {
 115                         gpu->iommu.pgshift = PAGE_SHIFT;
 116                 } else {
 117                         gpu->iommu.pgshift = fls(pgsize_bitmap & ~PAGE_MASK);
 118                         if (gpu->iommu.pgshift == 0) {
 119                                 dev_warn(dev, "unsupported IOMMU page size\n");
 120                                 goto free_domain;
 121                         }
 122                         gpu->iommu.pgshift -= 1;
 123                 }
 124
 125                 err = iommu_attach_device(gpu->iommu.domain, dev);
 126                 if (err)
 127                         goto free_domain;
 128
 129                 err = nvkm_mm_init(&gpu->iommu._mm, 0,
 130                                    (1ULL << 40) >> gpu->iommu.pgshift, 1);
 131                 if (err)
 132                         goto detach_device;
 133
 134                 gpu->iommu.mm = &gpu->iommu._mm;
 135         }
 136
 137         return;
 138
 139 detach_device:
 140         iommu_detach_device(gpu->iommu.domain, dev);
 141
 142 free_domain:
 143         iommu_domain_free(gpu->iommu.domain);
 144
 145 error:
 146         gpu->iommu.domain = NULL;
 147         gpu->iommu.pgshift = 0;
 148         dev_err(dev, "cannot initialize IOMMU MM\n");
 149 }
 150
 151 static void nouveau_platform_remove_iommu(struct device *dev,
 152                                           struct nouveau_platform_gpu *gpu)
 153 {
 154         if (gpu->iommu.domain) {
 155                 nvkm_mm_fini(&gpu->iommu._mm);
 156                 iommu_detach_device(gpu->iommu.domain, dev);
 157                 iommu_domain_free(gpu->iommu.domain);
 158         }
 159 }
 160
 161 static int nouveau_platform_probe(struct platform_device *pdev)
 162 {
 163         struct nouveau_platform_gpu *gpu;
 164         struct nouveau_platform_device *device;
 165         struct drm_device *drm;
 166         int err;
 167
 168         gpu = devm_kzalloc(&pdev->dev, sizeof(*gpu), GFP_KERNEL);
 169         if (!gpu)
 170                 return -ENOMEM;
 171
 172         gpu->vdd = devm_regulator_get(&pdev->dev, "vdd");
 173         if (IS_ERR(gpu->vdd))
 174                 return PTR_ERR(gpu->vdd);
 175
 176         gpu->rst = devm_reset_control_get(&pdev->dev, "gpu");
 177         if (IS_ERR(gpu->rst))
 178                 return PTR_ERR(gpu->rst);
 179
 180         gpu->clk = devm_clk_get(&pdev->dev, "gpu");
 181         if (IS_ERR(gpu->clk))
 182                 return PTR_ERR(gpu->clk);
 183
 184         gpu->clk_pwr = devm_clk_get(&pdev->dev, "pwr");
 185         if (IS_ERR(gpu->clk_pwr))
 186                 return PTR_ERR(gpu->clk_pwr);
 187
 188         nouveau_platform_probe_iommu(&pdev->dev, gpu);
 189
 190         err = nouveau_platform_power_up(gpu);
 191         if (err)
 192                 return err;
 193
 194         drm = nouveau_platform_device_create(pdev, &device);
 195         if (IS_ERR(drm)) {
 196                 err = PTR_ERR(drm);
 197                 goto power_down;
 198         }
 199
 200         device->gpu = gpu;
 201         device->gpu_speedo = tegra_sku_info.gpu_speedo_value;
 202
 203         err = drm_dev_register(drm, 0);
 204         if (err < 0)
 205                 goto err_unref;
 206
 207         return 0;
 208
 209 err_unref:
 210         drm_dev_unref(drm);
 211
 212 power_down:
 213         nouveau_platform_power_down(gpu);
 214         nouveau_platform_remove_iommu(&pdev->dev, gpu);
 215
 216         return err;
 217 }
 218
 219 static int nouveau_platform_remove(struct platform_device *pdev)
 220 {
 221         struct drm_device *drm_dev = platform_get_drvdata(pdev);
 222         struct nouveau_drm *drm = nouveau_drm(drm_dev);
 223         struct nvkm_device *device = nvxx_device(&drm->device);
 224         struct nouveau_platform_gpu *gpu = nv_device_to_platform(device)->gpu;
 225         int err;
 226
 227         nouveau_drm_device_remove(drm_dev);
 228
 229         err = nouveau_platform_power_down(gpu);
 230
 231         nouveau_platform_remove_iommu(&pdev->dev, gpu);
 232
 233         return err;
 234 }
 235
 236 #if IS_ENABLED(CONFIG_OF)
 237 static const struct of_device_id nouveau_platform_match[] = {
 238         { .compatible = "nvidia,gk20a" },
 239         { }
 240 };
 241
 242 MODULE_DEVICE_TABLE(of, nouveau_platform_match);
 243 #endif
 244
 245 struct platform_driver nouveau_platform_driver = {
 246         .driver = {
 247                 .name = "nouveau",
 248                 .of_match_table = of_match_ptr(nouveau_platform_match),
 249         },
 250         .probe = nouveau_platform_probe,
 251         .remove = nouveau_platform_remove,
 252 };