diff options
Diffstat (limited to 'drivers/gpu/drm/stm/drv.c')
| -rw-r--r-- | drivers/gpu/drm/stm/drv.c | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/drivers/gpu/drm/stm/drv.c b/drivers/gpu/drm/stm/drv.c new file mode 100644 index 000000000000..83ab48f1fd00 --- /dev/null +++ b/drivers/gpu/drm/stm/drv.c @@ -0,0 +1,221 @@ +/* + * 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> + * + * License terms: GNU General Public License (GPL), version 2 + */ + +#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_cma_helper.h> +#include <drm/drm_gem_cma_helper.h> + +#include "ltdc.h" + +#define DRIVER_NAME "stm" +#define DRIVER_DESC "STMicroelectronics SoC DRM" +#define DRIVER_DATE "20170330" +#define DRIVER_MAJOR 1 +#define DRIVER_MINOR 0 +#define DRIVER_PATCH_LEVEL 0 + +#define STM_MAX_FB_WIDTH 2048 +#define STM_MAX_FB_HEIGHT 2048 /* same as width to handle orientation */ + +static void drv_output_poll_changed(struct drm_device *ddev) +{ + struct ltdc_device *ldev = ddev->dev_private; + + drm_fbdev_cma_hotplug_event(ldev->fbdev); +} + +static const struct drm_mode_config_funcs drv_mode_config_funcs = { + .fb_create = drm_fb_cma_create, + .output_poll_changed = drv_output_poll_changed, + .atomic_check = drm_atomic_helper_check, + .atomic_commit = drm_atomic_helper_commit, +}; + +static void drv_lastclose(struct drm_device *ddev) +{ + struct ltdc_device *ldev = ddev->dev_private; + + DRM_DEBUG("%s\n", __func__); + + drm_fbdev_cma_restore_mode(ldev->fbdev); +} + +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 = drv_lastclose, + .name = DRIVER_NAME, + .desc = DRIVER_DESC, + .date = DRIVER_DATE, + .major = DRIVER_MAJOR, + .minor = DRIVER_MINOR, + .patchlevel = DRIVER_PATCH_LEVEL, + .fops = &drv_driver_fops, + .dumb_create = drm_gem_cma_dumb_create, + .dumb_map_offset = drm_gem_cma_dumb_map_offset, + .dumb_destroy = drm_gem_dumb_destroy, + .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, + .enable_vblank = ltdc_crtc_enable_vblank, + .disable_vblank = ltdc_crtc_disable_vblank, +}; + +static int drv_load(struct drm_device *ddev) +{ + struct platform_device *pdev = to_platform_device(ddev->dev); + struct drm_fbdev_cma *fbdev; + 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) { + ldev = ddev->dev_private; + fbdev = drm_fbdev_cma_init(ddev, 16, + ddev->mode_config.num_connector); + if (IS_ERR(fbdev)) { + DRM_DEBUG("Warning: fails to create fbdev\n"); + fbdev = NULL; + } + ldev->fbdev = fbdev; + } + + platform_set_drvdata(pdev, ddev); + + return 0; +err: + drm_mode_config_cleanup(ddev); + return ret; +} + +static void drv_unload(struct drm_device *ddev) +{ + struct ltdc_device *ldev = ddev->dev_private; + + DRM_DEBUG("%s\n", __func__); + + if (ldev->fbdev) { + drm_fbdev_cma_fini(ldev->fbdev); + ldev->fbdev = NULL; + } + 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_unref; + + ret = drm_dev_register(ddev, 0); + if (ret) + goto err_unref; + + return 0; + +err_unref: + drm_dev_unref(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_unref(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 = DRIVER_NAME, + .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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