| // 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, |
| .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, |
| .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, |
| .get_scanout_position = ltdc_crtc_scanoutpos, |
| .get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos, |
| }; |
| |
| 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); |
| |
| 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_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; |
| |
| drm_fbdev_generic_setup(ddev, 16); |
| |
| 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"); |