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 #if IS_ENABLED(CONFIG_IOMMU_API)
  96
  97 static void nouveau_platform_probe_iommu(struct device *dev,
  98                                          struct nouveau_platform_gpu *gpu)
  99 {
 100         int err;
 101         unsigned long pgsize_bitmap;
 102
 103         mutex_init(&gpu->iommu.mutex);
 104
 105         if (iommu_present(&platform_bus_type)) {
 106                 gpu->iommu.domain = iommu_domain_alloc(&platform_bus_type);
 107                 if (IS_ERR(gpu->iommu.domain))
 108                         goto error;
 109
 110                 /*
 111                  * A IOMMU is only usable if it supports page sizes smaller
 112                  * or equal to the system's PAGE_SIZE, with a preference if
 113                  * both are equal.
 114                  */
 115                 pgsize_bitmap = gpu->iommu.domain->ops->pgsize_bitmap;
 116                 if (pgsize_bitmap & PAGE_SIZE) {
 117                         gpu->iommu.pgshift = PAGE_SHIFT;
 118                 } else {
 119                         gpu->iommu.pgshift = fls(pgsize_bitmap & ~PAGE_MASK);
 120                         if (gpu->iommu.pgshift == 0) {
 121                                 dev_warn(dev, "unsupported IOMMU page size\n");
 122                                 goto free_domain;
 123                         }
 124                         gpu->iommu.pgshift -= 1;
 125                 }
 126
 127                 err = iommu_attach_device(gpu->iommu.domain, dev);
 128                 if (err)
 129                         goto free_domain;
 130
 131                 err = nvkm_mm_init(&gpu->iommu._mm, 0,
 132                                    (1ULL << 40) >> gpu->iommu.pgshift, 1);
 133                 if (err)
 134                         goto detach_device;
 135
 136                 gpu->iommu.mm = &gpu->iommu._mm;
 137         }
 138
 139         return;
 140
 141 detach_device:
 142         iommu_detach_device(gpu->iommu.domain, dev);
 143
 144 free_domain:
 145         iommu_domain_free(gpu->iommu.domain);
 146
 147 error:
 148         gpu->iommu.domain = NULL;
 149         gpu->iommu.pgshift = 0;
 150         dev_err(dev, "cannot initialize IOMMU MM\n");
 151 }
 152
 153 static void nouveau_platform_remove_iommu(struct device *dev,
 154                                           struct nouveau_platform_gpu *gpu)
 155 {
 156         if (gpu->iommu.domain) {
 157                 nvkm_mm_fini(&gpu->iommu._mm);
 158                 iommu_detach_device(gpu->iommu.domain, dev);
 159                 iommu_domain_free(gpu->iommu.domain);
 160         }
 161 }
 162
 163 #else
 164
 165 static void nouveau_platform_probe_iommu(struct device *dev,
 166                                          struct nouveau_platform_gpu *gpu)
 167 {
 168 }
 169
 170 static void nouveau_platform_remove_iommu(struct device *dev,
 171                                           struct nouveau_platform_gpu *gpu)
 172 {
 173 }
 174
 175 #endif
 176
 177 static int nouveau_platform_probe(struct platform_device *pdev)
 178 {
 179         struct nouveau_platform_gpu *gpu;
 180         struct nouveau_platform_device *device;
 181         struct drm_device *drm;
 182         int err;
 183
 184         gpu = devm_kzalloc(&pdev->dev, sizeof(*gpu), GFP_KERNEL);
 185         if (!gpu)
 186                 return -ENOMEM;
 187
 188         gpu->vdd = devm_regulator_get(&pdev->dev, "vdd");
 189         if (IS_ERR(gpu->vdd))
 190                 return PTR_ERR(gpu->vdd);
 191
 192         gpu->rst = devm_reset_control_get(&pdev->dev, "gpu");
 193         if (IS_ERR(gpu->rst))
 194                 return PTR_ERR(gpu->rst);
 195
 196         gpu->clk = devm_clk_get(&pdev->dev, "gpu");
 197         if (IS_ERR(gpu->clk))
 198                 return PTR_ERR(gpu->clk);
 199
 200         gpu->clk_pwr = devm_clk_get(&pdev->dev, "pwr");
 201         if (IS_ERR(gpu->clk_pwr))
 202                 return PTR_ERR(gpu->clk_pwr);
 203
 204         nouveau_platform_probe_iommu(&pdev->dev, gpu);
 205
 206         err = nouveau_platform_power_up(gpu);
 207         if (err)
 208                 return err;
 209
 210         drm = nouveau_platform_device_create(pdev, &device);
 211         if (IS_ERR(drm)) {
 212                 err = PTR_ERR(drm);
 213                 goto power_down;
 214         }
 215
 216         device->gpu = gpu;
 217         device->gpu_speedo = tegra_sku_info.gpu_speedo_value;
 218
 219         err = drm_dev_register(drm, 0);
 220         if (err < 0)
 221                 goto err_unref;
 222
 223         return 0;
 224
 225 err_unref:
 226         drm_dev_unref(drm);
 227
 228 power_down:
 229         nouveau_platform_power_down(gpu);
 230         nouveau_platform_remove_iommu(&pdev->dev, gpu);
 231
 232         return err;
 233 }
 234
 235 static int nouveau_platform_remove(struct platform_device *pdev)
 236 {
 237         struct drm_device *drm_dev = platform_get_drvdata(pdev);
 238         struct nouveau_drm *drm = nouveau_drm(drm_dev);
 239         struct nvkm_device *device = nvxx_device(&drm->device);
 240         struct nouveau_platform_gpu *gpu = nv_device_to_platform(device)->gpu;
 241         int err;
 242
 243         nouveau_drm_device_remove(drm_dev);
 244
 245         err = nouveau_platform_power_down(gpu);
 246
 247         nouveau_platform_remove_iommu(&pdev->dev, gpu);
 248
 249         return err;
 250 }
 251
 252 #if IS_ENABLED(CONFIG_OF)
 253 static const struct of_device_id nouveau_platform_match[] = {
 254         { .compatible = "nvidia,gk20a" },
 255         { }
 256 };
 257
 258 MODULE_DEVICE_TABLE(of, nouveau_platform_match);
 259 #endif
 260
 261 struct platform_driver nouveau_platform_driver = {
 262         .driver = {
 263                 .name = "nouveau",
 264                 .of_match_table = of_match_ptr(nouveau_platform_match),
 265         },
 266         .probe = nouveau_platform_probe,
 267         .remove = nouveau_platform_remove,
 268 };