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 <soc/tegra/pmc.h>
  31
  32 #include "nouveau_drm.h"
  33 #include "nouveau_platform.h"
  34
  35 static int nouveau_platform_power_up(struct nouveau_platform_gpu *gpu)
  36 {
  37         int err;
  38
  39         err = regulator_enable(gpu->vdd);
  40         if (err)
  41                 goto err_power;
  42
  43         err = clk_prepare_enable(gpu->clk);
  44         if (err)
  45                 goto err_clk;
  46         err = clk_prepare_enable(gpu->clk_pwr);
  47         if (err)
  48                 goto err_clk_pwr;
  49         clk_set_rate(gpu->clk_pwr, 204000000);
  50         udelay(10);
  51
  52         reset_control_assert(gpu->rst);
  53         udelay(10);
  54
  55         err = tegra_powergate_remove_clamping(TEGRA_POWERGATE_3D);
  56         if (err)
  57                 goto err_clamp;
  58         udelay(10);
  59
  60         reset_control_deassert(gpu->rst);
  61         udelay(10);
  62
  63         return 0;
  64
  65 err_clamp:
  66         clk_disable_unprepare(gpu->clk_pwr);
  67 err_clk_pwr:
  68         clk_disable_unprepare(gpu->clk);
  69 err_clk:
  70         regulator_disable(gpu->vdd);
  71 err_power:
  72         return err;
  73 }
  74
  75 static int nouveau_platform_power_down(struct nouveau_platform_gpu *gpu)
  76 {
  77         int err;
  78
  79         reset_control_assert(gpu->rst);
  80         udelay(10);
  81
  82         clk_disable_unprepare(gpu->clk_pwr);
  83         clk_disable_unprepare(gpu->clk);
  84         udelay(10);
  85
  86         err = regulator_disable(gpu->vdd);
  87         if (err)
  88                 return err;
  89
  90         return 0;
  91 }
  92
  93 static int nouveau_platform_probe(struct platform_device *pdev)
  94 {
  95         struct nouveau_platform_gpu *gpu;
  96         struct nouveau_platform_device *device;
  97         struct drm_device *drm;
  98         int err;
  99
 100         gpu = devm_kzalloc(&pdev->dev, sizeof(*gpu), GFP_KERNEL);
 101         if (!gpu)
 102                 return -ENOMEM;
 103
 104         gpu->vdd = devm_regulator_get(&pdev->dev, "vdd");
 105         if (IS_ERR(gpu->vdd))
 106                 return PTR_ERR(gpu->vdd);
 107
 108         gpu->rst = devm_reset_control_get(&pdev->dev, "gpu");
 109         if (IS_ERR(gpu->rst))
 110                 return PTR_ERR(gpu->rst);
 111
 112         gpu->clk = devm_clk_get(&pdev->dev, "gpu");
 113         if (IS_ERR(gpu->clk))
 114                 return PTR_ERR(gpu->clk);
 115
 116         gpu->clk_pwr = devm_clk_get(&pdev->dev, "pwr");
 117         if (IS_ERR(gpu->clk_pwr))
 118                 return PTR_ERR(gpu->clk_pwr);
 119
 120         err = nouveau_platform_power_up(gpu);
 121         if (err)
 122                 return err;
 123
 124         drm = nouveau_platform_device_create(pdev, &device);
 125         if (IS_ERR(drm)) {
 126                 err = PTR_ERR(drm);
 127                 goto power_down;
 128         }
 129
 130         device->gpu = gpu;
 131
 132         err = drm_dev_register(drm, 0);
 133         if (err < 0)
 134                 goto err_unref;
 135
 136         return 0;
 137
 138 err_unref:
 139         drm_dev_unref(drm);
 140
 141         return 0;
 142
 143 power_down:
 144         nouveau_platform_power_down(gpu);
 145
 146         return err;
 147 }
 148
 149 static int nouveau_platform_remove(struct platform_device *pdev)
 150 {
 151         struct drm_device *drm_dev = platform_get_drvdata(pdev);
 152         struct nouveau_device *device = nouveau_dev(drm_dev);
 153         struct nouveau_platform_gpu *gpu = nv_device_to_platform(device)->gpu;
 154
 155         nouveau_drm_device_remove(drm_dev);
 156
 157         return nouveau_platform_power_down(gpu);
 158 }
 159
 160 #if IS_ENABLED(CONFIG_OF)
 161 static const struct of_device_id nouveau_platform_match[] = {
 162         { .compatible = "nvidia,gk20a" },
 163         { }
 164 };
 165
 166 MODULE_DEVICE_TABLE(of, nouveau_platform_match);
 167 #endif
 168
 169 struct platform_driver nouveau_platform_driver = {
 170         .driver = {
 171                 .name = "nouveau",
 172                 .of_match_table = of_match_ptr(nouveau_platform_match),
 173         },
 174         .probe = nouveau_platform_probe,
 175         .remove = nouveau_platform_remove,
 176 };
 177
 178 module_platform_driver(nouveau_platform_driver);
 179
 180 MODULE_AUTHOR(DRIVER_AUTHOR);
 181 MODULE_DESCRIPTION(DRIVER_DESC);
 182 MODULE_LICENSE("GPL and additional rights");