260 lines
6.2 KiB
C
260 lines
6.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) STMicroelectronics SA 2017
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*
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* Authors: Philippe Cornu <philippe.cornu@st.com>
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* Yannick Fertre <yannick.fertre@st.com>
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* Fabien Dessenne <fabien.dessenne@st.com>
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* Mickael Reulier <mickael.reulier@st.com>
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*/
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#include <linux/component.h>
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#include <linux/dma-mapping.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/pm_runtime.h>
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#include <drm/drm_atomic.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_fb_cma_helper.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_gem_cma_helper.h>
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#include <drm/drm_gem_framebuffer_helper.h>
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#include <drm/drm_probe_helper.h>
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#include <drm/drm_vblank.h>
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#include "ltdc.h"
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#define STM_MAX_FB_WIDTH 2048
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#define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */
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static const struct drm_mode_config_funcs drv_mode_config_funcs = {
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.fb_create = drm_gem_fb_create,
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.atomic_check = drm_atomic_helper_check,
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.atomic_commit = drm_atomic_helper_commit,
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};
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static int stm_gem_cma_dumb_create(struct drm_file *file,
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struct drm_device *dev,
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struct drm_mode_create_dumb *args)
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{
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unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
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/*
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* in order to optimize data transfer, pitch is aligned on
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* 128 bytes, height is aligned on 4 bytes
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*/
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args->pitch = roundup(min_pitch, 128);
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args->height = roundup(args->height, 4);
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return drm_gem_cma_dumb_create_internal(file, dev, args);
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}
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DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
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static struct drm_driver drv_driver = {
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.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
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.name = "stm",
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.desc = "STMicroelectronics SoC DRM",
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.date = "20170330",
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.major = 1,
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.minor = 0,
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.patchlevel = 0,
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.fops = &drv_driver_fops,
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.dumb_create = stm_gem_cma_dumb_create,
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.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
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.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
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.gem_free_object_unlocked = drm_gem_cma_free_object,
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.gem_vm_ops = &drm_gem_cma_vm_ops,
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.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
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.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
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.gem_prime_vmap = drm_gem_cma_prime_vmap,
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.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
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.gem_prime_mmap = drm_gem_cma_prime_mmap,
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.get_scanout_position = ltdc_crtc_scanoutpos,
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.get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
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};
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static int drv_load(struct drm_device *ddev)
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{
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struct platform_device *pdev = to_platform_device(ddev->dev);
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struct ltdc_device *ldev;
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int ret;
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DRM_DEBUG("%s\n", __func__);
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ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
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if (!ldev)
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return -ENOMEM;
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ddev->dev_private = (void *)ldev;
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drm_mode_config_init(ddev);
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/*
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* set max width and height as default value.
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* this value would be used to check framebuffer size limitation
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* at drm_mode_addfb().
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*/
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ddev->mode_config.min_width = 0;
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ddev->mode_config.min_height = 0;
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ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
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ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
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ddev->mode_config.funcs = &drv_mode_config_funcs;
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ret = ltdc_load(ddev);
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if (ret)
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goto err;
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drm_mode_config_reset(ddev);
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drm_kms_helper_poll_init(ddev);
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platform_set_drvdata(pdev, ddev);
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return 0;
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err:
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drm_mode_config_cleanup(ddev);
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return ret;
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}
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static void drv_unload(struct drm_device *ddev)
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{
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DRM_DEBUG("%s\n", __func__);
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drm_kms_helper_poll_fini(ddev);
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ltdc_unload(ddev);
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drm_mode_config_cleanup(ddev);
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}
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static __maybe_unused int drv_suspend(struct device *dev)
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{
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struct drm_device *ddev = dev_get_drvdata(dev);
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struct ltdc_device *ldev = ddev->dev_private;
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struct drm_atomic_state *state;
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WARN_ON(ldev->suspend_state);
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state = drm_atomic_helper_suspend(ddev);
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if (IS_ERR(state))
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return PTR_ERR(state);
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ldev->suspend_state = state;
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pm_runtime_force_suspend(dev);
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return 0;
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}
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static __maybe_unused int drv_resume(struct device *dev)
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{
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struct drm_device *ddev = dev_get_drvdata(dev);
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struct ltdc_device *ldev = ddev->dev_private;
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int ret;
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if (WARN_ON(!ldev->suspend_state))
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return -ENOENT;
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pm_runtime_force_resume(dev);
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ret = drm_atomic_helper_resume(ddev, ldev->suspend_state);
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if (ret)
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pm_runtime_force_suspend(dev);
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ldev->suspend_state = NULL;
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return ret;
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}
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static __maybe_unused int drv_runtime_suspend(struct device *dev)
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{
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struct drm_device *ddev = dev_get_drvdata(dev);
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DRM_DEBUG_DRIVER("\n");
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ltdc_suspend(ddev);
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return 0;
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}
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static __maybe_unused int drv_runtime_resume(struct device *dev)
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{
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struct drm_device *ddev = dev_get_drvdata(dev);
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DRM_DEBUG_DRIVER("\n");
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return ltdc_resume(ddev);
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}
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static const struct dev_pm_ops drv_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
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SET_RUNTIME_PM_OPS(drv_runtime_suspend,
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drv_runtime_resume, NULL)
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};
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static int stm_drm_platform_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct drm_device *ddev;
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int ret;
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DRM_DEBUG("%s\n", __func__);
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dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
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ddev = drm_dev_alloc(&drv_driver, dev);
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if (IS_ERR(ddev))
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return PTR_ERR(ddev);
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ret = drv_load(ddev);
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if (ret)
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goto err_put;
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ret = drm_dev_register(ddev, 0);
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if (ret)
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goto err_put;
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drm_fbdev_generic_setup(ddev, 16);
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return 0;
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err_put:
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drm_dev_put(ddev);
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return ret;
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}
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static int stm_drm_platform_remove(struct platform_device *pdev)
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{
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struct drm_device *ddev = platform_get_drvdata(pdev);
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DRM_DEBUG("%s\n", __func__);
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drm_dev_unregister(ddev);
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drv_unload(ddev);
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drm_dev_put(ddev);
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return 0;
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}
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static const struct of_device_id drv_dt_ids[] = {
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{ .compatible = "st,stm32-ltdc"},
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{ /* end node */ },
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};
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MODULE_DEVICE_TABLE(of, drv_dt_ids);
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static struct platform_driver stm_drm_platform_driver = {
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.probe = stm_drm_platform_probe,
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.remove = stm_drm_platform_remove,
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.driver = {
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.name = "stm32-display",
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.of_match_table = drv_dt_ids,
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.pm = &drv_pm_ops,
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},
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};
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module_platform_driver(stm_drm_platform_driver);
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MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
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MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
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MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
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MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
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MODULE_LICENSE("GPL v2");
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