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