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/*
* Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/of.h>
#include <linux/reset.h>
#include <linux/regulator/consumer.h>
#include <soc/tegra/fuse.h>
#include <soc/tegra/pmc.h>
#include "nouveau_drm.h"
#include "nouveau_platform.h"
static int nouveau_platform_power_up(struct nouveau_platform_gpu *gpu)
{
int err;
err = regulator_enable(gpu->vdd);
if (err)
goto err_power;
err = clk_prepare_enable(gpu->clk);
if (err)
goto err_clk;
err = clk_prepare_enable(gpu->clk_pwr);
if (err)
goto err_clk_pwr;
clk_set_rate(gpu->clk_pwr, 204000000);
udelay(10);
reset_control_assert(gpu->rst);
udelay(10);
err = tegra_powergate_remove_clamping(TEGRA_POWERGATE_3D);
if (err)
goto err_clamp;
udelay(10);
reset_control_deassert(gpu->rst);
udelay(10);
return 0;
err_clamp:
clk_disable_unprepare(gpu->clk_pwr);
err_clk_pwr:
clk_disable_unprepare(gpu->clk);
err_clk:
regulator_disable(gpu->vdd);
err_power:
return err;
}
static int nouveau_platform_power_down(struct nouveau_platform_gpu *gpu)
{
int err;
reset_control_assert(gpu->rst);
udelay(10);
clk_disable_unprepare(gpu->clk_pwr);
clk_disable_unprepare(gpu->clk);
udelay(10);
err = regulator_disable(gpu->vdd);
if (err)
return err;
return 0;
}
static int nouveau_platform_probe(struct platform_device *pdev)
{
struct nouveau_platform_gpu *gpu;
struct nouveau_platform_device *device;
struct drm_device *drm;
int err;
gpu = devm_kzalloc(&pdev->dev, sizeof(*gpu), GFP_KERNEL);
if (!gpu)
return -ENOMEM;
gpu->vdd = devm_regulator_get(&pdev->dev, "vdd");
if (IS_ERR(gpu->vdd))
return PTR_ERR(gpu->vdd);
gpu->rst = devm_reset_control_get(&pdev->dev, "gpu");
if (IS_ERR(gpu->rst))
return PTR_ERR(gpu->rst);
gpu->clk = devm_clk_get(&pdev->dev, "gpu");
if (IS_ERR(gpu->clk))
return PTR_ERR(gpu->clk);
gpu->clk_pwr = devm_clk_get(&pdev->dev, "pwr");
if (IS_ERR(gpu->clk_pwr))
return PTR_ERR(gpu->clk_pwr);
err = nouveau_platform_power_up(gpu);
if (err)
return err;
drm = nouveau_platform_device_create(pdev, &device);
if (IS_ERR(drm)) {
err = PTR_ERR(drm);
goto power_down;
}
device->gpu = gpu;
device->gpu_speedo = tegra_sku_info.gpu_speedo_value;
err = drm_dev_register(drm, 0);
if (err < 0)
goto err_unref;
return 0;
err_unref:
drm_dev_unref(drm);
return 0;
power_down:
nouveau_platform_power_down(gpu);
return err;
}
static int nouveau_platform_remove(struct platform_device *pdev)
{
struct drm_device *drm_dev = platform_get_drvdata(pdev);
struct nouveau_drm *drm = nouveau_drm(drm_dev);
struct nouveau_device *device = nvkm_device(&drm->device);
struct nouveau_platform_gpu *gpu = nv_device_to_platform(device)->gpu;
nouveau_drm_device_remove(drm_dev);
return nouveau_platform_power_down(gpu);
}
#if IS_ENABLED(CONFIG_OF)
static const struct of_device_id nouveau_platform_match[] = {
{ .compatible = "nvidia,gk20a" },
{ }
};
MODULE_DEVICE_TABLE(of, nouveau_platform_match);
#endif
struct platform_driver nouveau_platform_driver = {
.driver = {
.name = "nouveau",
.of_match_table = of_match_ptr(nouveau_platform_match),
},
.probe = nouveau_platform_probe,
.remove = nouveau_platform_remove,
};
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