diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_platform.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_platform.c | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_platform.c b/drivers/gpu/drm/nouveau/nouveau_platform.c new file mode 100644 index 000000000000..0ffeb50d0088 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nouveau_platform.c @@ -0,0 +1,182 @@ +/* + * 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/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; + + 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_device *device = nouveau_dev(drm_dev); + 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, +}; + +module_platform_driver(nouveau_platform_driver); + +MODULE_AUTHOR(DRIVER_AUTHOR); +MODULE_DESCRIPTION(DRIVER_DESC); +MODULE_LICENSE("GPL and additional rights"); |