/* * Copyright (C) STMicroelectronics SA 2014 * Author: Benjamin Gaignard for STMicroelectronics. * License terms: GNU General Public License (GPL), version 2 */ #include #include #include #include #include #include #include #include #include #include #include #include "sti_crtc.h" #include "sti_drv.h" #define DRIVER_NAME "sti" #define DRIVER_DESC "STMicroelectronics SoC DRM" #define DRIVER_DATE "20140601" #define DRIVER_MAJOR 1 #define DRIVER_MINOR 0 #define STI_MAX_FB_HEIGHT 4096 #define STI_MAX_FB_WIDTH 4096 static void sti_atomic_schedule(struct sti_private *private, struct drm_atomic_state *state) { private->commit.state = state; schedule_work(&private->commit.work); } static void sti_atomic_complete(struct sti_private *private, struct drm_atomic_state *state) { struct drm_device *drm = private->drm_dev; /* * Everything below can be run asynchronously without the need to grab * any modeset locks at all under one condition: It must be guaranteed * that the asynchronous work has either been cancelled (if the driver * supports it, which at least requires that the framebuffers get * cleaned up with drm_atomic_helper_cleanup_planes()) or completed * before the new state gets committed on the software side with * drm_atomic_helper_swap_state(). * * This scheme allows new atomic state updates to be prepared and * checked in parallel to the asynchronous completion of the previous * update. Which is important since compositors need to figure out the * composition of the next frame right after having submitted the * current layout. */ drm_atomic_helper_commit_modeset_disables(drm, state); drm_atomic_helper_commit_planes(drm, state, false); drm_atomic_helper_commit_modeset_enables(drm, state); drm_atomic_helper_wait_for_vblanks(drm, state); drm_atomic_helper_cleanup_planes(drm, state); drm_atomic_state_free(state); } static void sti_atomic_work(struct work_struct *work) { struct sti_private *private = container_of(work, struct sti_private, commit.work); sti_atomic_complete(private, private->commit.state); } static int sti_atomic_commit(struct drm_device *drm, struct drm_atomic_state *state, bool async) { struct sti_private *private = drm->dev_private; int err; err = drm_atomic_helper_prepare_planes(drm, state); if (err) return err; /* serialize outstanding asynchronous commits */ mutex_lock(&private->commit.lock); flush_work(&private->commit.work); /* * This is the point of no return - everything below never fails except * when the hw goes bonghits. Which means we can commit the new state on * the software side now. */ drm_atomic_helper_swap_state(drm, state); if (async) sti_atomic_schedule(private, state); else sti_atomic_complete(private, state); mutex_unlock(&private->commit.lock); return 0; } static const struct drm_mode_config_funcs sti_mode_config_funcs = { .fb_create = drm_fb_cma_create, .atomic_check = drm_atomic_helper_check, .atomic_commit = sti_atomic_commit, }; static void sti_mode_config_init(struct drm_device *dev) { dev->mode_config.min_width = 0; dev->mode_config.min_height = 0; /* * set max width and height as default value. * this value would be used to check framebuffer size limitation * at drm_mode_addfb(). */ dev->mode_config.max_width = STI_MAX_FB_WIDTH; dev->mode_config.max_height = STI_MAX_FB_HEIGHT; dev->mode_config.funcs = &sti_mode_config_funcs; } static int sti_load(struct drm_device *dev, unsigned long flags) { struct sti_private *private; int ret; private = kzalloc(sizeof(*private), GFP_KERNEL); if (!private) { DRM_ERROR("Failed to allocate private\n"); return -ENOMEM; } dev->dev_private = (void *)private; private->drm_dev = dev; mutex_init(&private->commit.lock); INIT_WORK(&private->commit.work, sti_atomic_work); drm_mode_config_init(dev); drm_kms_helper_poll_init(dev); sti_mode_config_init(dev); ret = component_bind_all(dev->dev, dev); if (ret) { drm_kms_helper_poll_fini(dev); drm_mode_config_cleanup(dev); kfree(private); return ret; } drm_mode_config_reset(dev); drm_helper_disable_unused_functions(dev); drm_fbdev_cma_init(dev, 32, dev->mode_config.num_crtc, dev->mode_config.num_connector); return 0; } static const struct file_operations sti_driver_fops = { .owner = THIS_MODULE, .open = drm_open, .mmap = drm_gem_cma_mmap, .poll = drm_poll, .read = drm_read, .unlocked_ioctl = drm_ioctl, #ifdef CONFIG_COMPAT .compat_ioctl = drm_compat_ioctl, #endif .release = drm_release, }; static struct dma_buf *sti_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj, int flags) { /* we want to be able to write in mmapped buffer */ flags |= O_RDWR; return drm_gem_prime_export(dev, obj, flags); } static struct drm_driver sti_driver = { .driver_features = DRIVER_HAVE_IRQ | DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME, .load = sti_load, .gem_free_object = drm_gem_cma_free_object, .gem_vm_ops = &drm_gem_cma_vm_ops, .dumb_create = drm_gem_cma_dumb_create, .dumb_map_offset = drm_gem_cma_dumb_map_offset, .dumb_destroy = drm_gem_dumb_destroy, .fops = &sti_driver_fops, .get_vblank_counter = drm_vblank_no_hw_counter, .enable_vblank = sti_crtc_enable_vblank, .disable_vblank = sti_crtc_disable_vblank, .prime_handle_to_fd = drm_gem_prime_handle_to_fd, .prime_fd_to_handle = drm_gem_prime_fd_to_handle, .gem_prime_export = sti_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, .name = DRIVER_NAME, .desc = DRIVER_DESC, .date = DRIVER_DATE, .major = DRIVER_MAJOR, .minor = DRIVER_MINOR, }; static int compare_of(struct device *dev, void *data) { return dev->of_node == data; } static int sti_bind(struct device *dev) { return drm_platform_init(&sti_driver, to_platform_device(dev)); } static void sti_unbind(struct device *dev) { drm_put_dev(dev_get_drvdata(dev)); } static const struct component_master_ops sti_ops = { .bind = sti_bind, .unbind = sti_unbind, }; static int sti_platform_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct device_node *node = dev->of_node; struct device_node *child_np; struct component_match *match = NULL; dma_set_coherent_mask(dev, DMA_BIT_MASK(32)); of_platform_populate(node, NULL, NULL, dev); child_np = of_get_next_available_child(node, NULL); while (child_np) { component_match_add(dev, &match, compare_of, child_np); of_node_put(child_np); child_np = of_get_next_available_child(node, child_np); } return component_master_add_with_match(dev, &sti_ops, match); } static int sti_platform_remove(struct platform_device *pdev) { component_master_del(&pdev->dev, &sti_ops); of_platform_depopulate(&pdev->dev); return 0; } static const struct of_device_id sti_dt_ids[] = { { .compatible = "st,sti-display-subsystem", }, { /* end node */ }, }; MODULE_DEVICE_TABLE(of, sti_dt_ids); static struct platform_driver sti_platform_driver = { .probe = sti_platform_probe, .remove = sti_platform_remove, .driver = { .name = DRIVER_NAME, .of_match_table = sti_dt_ids, }, }; static struct platform_driver * const drivers[] = { &sti_tvout_driver, &sti_vtac_driver, &sti_hqvdp_driver, &sti_hdmi_driver, &sti_hda_driver, &sti_dvo_driver, &sti_vtg_driver, &sti_compositor_driver, &sti_platform_driver, }; static int sti_drm_init(void) { return platform_register_drivers(drivers, ARRAY_SIZE(drivers)); } module_init(sti_drm_init); static void sti_drm_exit(void) { platform_unregister_drivers(drivers, ARRAY_SIZE(drivers)); } module_exit(sti_drm_exit); MODULE_AUTHOR("Benjamin Gaignard "); MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver"); MODULE_LICENSE("GPL");