diff options
Diffstat (limited to 'drivers/gpu/drm/sti/sti_drv.c')
| -rw-r--r-- | drivers/gpu/drm/sti/sti_drv.c | 294 |
1 files changed, 294 insertions, 0 deletions
diff --git a/drivers/gpu/drm/sti/sti_drv.c b/drivers/gpu/drm/sti/sti_drv.c new file mode 100644 index 000000000000..6f4af6a8ba1b --- /dev/null +++ b/drivers/gpu/drm/sti/sti_drv.c @@ -0,0 +1,294 @@ +/* + * Copyright (C) STMicroelectronics SA 2014 + * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics. + * License terms: GNU General Public License (GPL), version 2 + */ + +#include <drm/drmP.h> + +#include <linux/component.h> +#include <linux/debugfs.h> +#include <linux/kernel.h> +#include <linux/module.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_gem_cma_helper.h> +#include <drm/drm_fb_cma_helper.h> + +#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); + 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 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_HEIGHT; + dev->mode_config.max_height = STI_MAX_FB_WIDTH; + + 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); + +#ifdef CONFIG_DRM_STI_FBDEV + drm_fbdev_cma_init(dev, 32, + dev->mode_config.num_crtc, + dev->mode_config.num_connector); +#endif + 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_count, + .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, + }, +}; + +module_platform_driver(sti_platform_driver); + +MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>"); +MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver"); +MODULE_LICENSE("GPL"); |