blob: 506b5626f3ed2ed3a188ff9bc1e51144e40b8932 [file] [log] [blame]
/*
* 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, 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 <benjamin.gaignard@st.com>");
MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
MODULE_LICENSE("GPL");