// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2015 Free Electrons
* Copyright (C) 2015 NextThing Co
*
* Maxime Ripard <[email protected]>
*/
#include <linux/component.h>
#include <linux/dma-mapping.h>
#include <linux/kfifo.h>
#include <linux/module.h>
#include <linux/of_graph.h>
#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <drm/drm_aperture.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_drv.h>
#include <drm/drm_fbdev_dma.h>
#include <drm/drm_gem_dma_helper.h>
#include <drm/drm_module.h>
#include <drm/drm_of.h>
#include <drm/drm_probe_helper.h>
#include <drm/drm_vblank.h>
#include "sun4i_drv.h"
#include "sun4i_frontend.h"
#include "sun4i_framebuffer.h"
#include "sun4i_tcon.h"
#include "sun8i_tcon_top.h"
static int drm_sun4i_gem_dumb_create(struct drm_file *file_priv,
struct drm_device *drm,
struct drm_mode_create_dumb *args)
{
/* The hardware only allows even pitches for YUV buffers. */
args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), 2);
return drm_gem_dma_dumb_create_internal(file_priv, drm, args);
}
DEFINE_DRM_GEM_DMA_FOPS(sun4i_drv_fops);
static const struct drm_driver sun4i_drv_driver = {
.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
/* Generic Operations */
.fops = &sun4i_drv_fops,
.name = "sun4i-drm",
.desc = "Allwinner sun4i Display Engine",
.date = "20150629",
.major = 1,
.minor = 0,
/* GEM Operations */
DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(drm_sun4i_gem_dumb_create),
};
static int sun4i_drv_bind(struct device *dev)
{
struct drm_device *drm;
struct sun4i_drv *drv;
int ret;
drm = drm_dev_alloc(&sun4i_drv_driver, dev);
if (IS_ERR(drm))
return PTR_ERR(drm);
drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
if (!drv) {
ret = -ENOMEM;
goto free_drm;
}
drm->dev_private = drv;
INIT_LIST_HEAD(&drv->frontend_list);
INIT_LIST_HEAD(&drv->engine_list);
INIT_LIST_HEAD(&drv->tcon_list);
ret = of_reserved_mem_device_init(dev);
if (ret && ret != -ENODEV) {
dev_err(drm->dev, "Couldn't claim our memory region\n");
goto free_drm;
}
drm_mode_config_init(drm);
ret = component_bind_all(drm->dev, drm);
if (ret) {
dev_err(drm->dev, "Couldn't bind all pipelines components\n");
goto cleanup_mode_config;
}
/* drm_vblank_init calls kcalloc, which can fail */
ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
if (ret)
goto unbind_all;
/* Remove early framebuffers (ie. simplefb) */
ret = drm_aperture_remove_framebuffers(&sun4i_drv_driver);
if (ret)
goto unbind_all;
sun4i_framebuffer_init(drm);
/* Enable connectors polling */
drm_kms_helper_poll_init(drm);
ret = drm_dev_register(drm, 0);
if (ret)
goto finish_poll;
drm_fbdev_dma_setup(drm, 32);
dev_set_drvdata(dev, drm);
return 0;
finish_poll:
drm_kms_helper_poll_fini(drm);
unbind_all:
component_unbind_all(dev, NULL);
cleanup_mode_config:
drm_mode_config_cleanup(drm);
of_reserved_mem_device_release(dev);
free_drm:
drm_dev_put(drm);
return ret;
}
static void sun4i_drv_unbind(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
dev_set_drvdata(dev, NULL);
drm_dev_unregister(drm);
drm_kms_helper_poll_fini(drm);
drm_atomic_helper_shutdown(drm);
drm_mode_config_cleanup(drm);
component_unbind_all(dev, NULL);
of_reserved_mem_device_release(dev);
drm_dev_put(drm);
}
static const struct component_master_ops sun4i_drv_master_ops = {
.bind = sun4i_drv_bind,
.unbind = sun4i_drv_unbind,
};
static bool sun4i_drv_node_is_connector(struct device_node *node)
{
return of_device_is_compatible(node, "hdmi-connector");
}
static bool sun4i_drv_node_is_frontend(struct device_node *node)
{
return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") ||
of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||
of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");
}
static bool sun4i_drv_node_is_deu(struct device_node *node)
{
return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");
}
static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)
{
if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))
return !!of_match_node(sun4i_frontend_of_table, node);
return false;
}
static bool sun4i_drv_node_is_tcon(struct device_node *node)
{
return !!of_match_node(sun4i_tcon_of_table, node);
}
static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)
{
const struct of_device_id *match;
match = of_match_node(sun4i_tcon_of_table, node);
if (match) {
struct sun4i_tcon_quirks *quirks;
quirks = (struct sun4i_tcon_quirks *)match->data;
return quirks->has_channel_0;
}
return false;
}
static bool sun4i_drv_node_is_tcon_top(struct device_node *node)
{
return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&
!!of_match_node(sun8i_tcon_top_of_table, node);
}
/*
* The encoder drivers use drm_of_find_possible_crtcs to get upstream
* crtcs from the device tree using of_graph. For the results to be
* correct, encoders must be probed/bound after _all_ crtcs have been
* created. The existing code uses a depth first recursive traversal
* of the of_graph, which means the encoders downstream of the TCON
* get add right after the first TCON. The second TCON or CRTC will
* never be properly associated with encoders connected to it.
*
* Also, in a dual display pipeline setup, both frontends can feed
* either backend, and both backends can feed either TCON, we want
* all components of the same type to be added before the next type
* in the pipeline. Fortunately, the pipelines are perfectly symmetric,
* i.e. components of the same type are at the same depth when counted
* from the frontend. The only exception is the third pipeline in
* the A80 SoC, which we do not support anyway.
*
* Hence we can use a breadth first search traversal order to add
* components. We do not need to check for duplicates. The component
* matching system handles this for us.
*/
struct endpoint_list {
DECLARE_KFIFO(fifo, struct device_node *, 16);
};
static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,
struct device_node *node,
int port_id)
{
struct device_node *ep, *remote, *port;
port = of_graph_get_port_by_id(node, port_id);
if (!port) {
DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id);
return;
}
for_each_available_child_of_node(port, ep) {
remote = of_graph_get_remote_port_parent(ep);
if (!remote) {
DRM_DEBUG_DRIVER("Error retrieving the output node\n");
continue;
}
if (sun4i_drv_node_is_tcon(node)) {
/*
* TCON TOP is always probed before TCON. However, TCON
* points back to TCON TOP when it is source for HDMI.
* We have to skip it here to prevent infinite looping
* between TCON TOP and TCON.
*/
if (sun4i_drv_node_is_tcon_top(remote)) {
DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n");
of_node_put(remote);
continue;
}
/*
* If the node is our TCON with channel 0, the first
* port is used for panel or bridges, and will not be
* part of the component framework.
*/
if (sun4i_drv_node_is_tcon_with_ch0(node)) {
struct of_endpoint endpoint;
if (of_graph_parse_endpoint(ep, &endpoint)) {
DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
of_node_put(remote);
continue;
}
if (!endpoint.id) {
DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
of_node_put(remote);
continue;
}
}
}
kfifo_put(&list->fifo, remote);
}
}
static int sun4i_drv_add_endpoints(struct device *dev,
struct endpoint_list *list,
struct component_match **match,
struct device_node *node)
{
int count = 0;
/*
* The frontend has been disabled in some of our old device
* trees. If we find a node that is the frontend and is
* disabled, we should just follow through and parse its
* child, but without adding it to the component list.
* Otherwise, we obviously want to add it to the list.
*/
if (!sun4i_drv_node_is_frontend(node) &&
!of_device_is_available(node))
return 0;
/*
* The connectors will be the last nodes in our pipeline, we
* can just bail out.
*/
if (sun4i_drv_node_is_connector(node))
return 0;
/*
* If the device is either just a regular device, or an
* enabled frontend supported by the driver, we add it to our
* component list.
*/
if (!(sun4i_drv_node_is_frontend(node) ||
sun4i_drv_node_is_deu(node)) ||
(sun4i_drv_node_is_supported_frontend(node) &&
of_device_is_available(node))) {
/* Add current component */
DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
drm_of_component_match_add(dev, match, component_compare_of, node);
count++;
}
/* each node has at least one output */
sun4i_drv_traverse_endpoints(list, node, 1);
/* TCON TOP has second and third output */
if (sun4i_drv_node_is_tcon_top(node)) {
sun4i_drv_traverse_endpoints(list, node, 3);
sun4i_drv_traverse_endpoints(list, node, 5);
}
return count;
}
#ifdef CONFIG_PM_SLEEP
static int sun4i_drv_drm_sys_suspend(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
return drm_mode_config_helper_suspend(drm);
}
static int sun4i_drv_drm_sys_resume(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
return drm_mode_config_helper_resume(drm);
}
#endif
static const struct dev_pm_ops sun4i_drv_drm_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(sun4i_drv_drm_sys_suspend,
sun4i_drv_drm_sys_resume)
};
static int sun4i_drv_probe(struct platform_device *pdev)
{
struct component_match *match = NULL;
struct device_node *np = pdev->dev.of_node, *endpoint;
struct endpoint_list list;
int i, ret, count = 0;
INIT_KFIFO(list.fifo);
/*
* DE2 and DE3 cores actually supports 40-bit addresses, but
* driver does not.
*/
dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
dma_set_max_seg_size(&pdev->dev, UINT_MAX);
for (i = 0;; i++) {
struct device_node *pipeline = of_parse_phandle(np,
"allwinner,pipelines",
i);
if (!pipeline)
break;
kfifo_put(&list.fifo, pipeline);
}
while (kfifo_get(&list.fifo, &endpoint)) {
/* process this endpoint */
ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
endpoint);
/* sun4i_drv_add_endpoints can fail to allocate memory */
if (ret < 0)
return ret;
count += ret;
}
if (count)
return component_master_add_with_match(&pdev->dev,
&sun4i_drv_master_ops,
match);
else
return 0;
}
static void sun4i_drv_remove(struct platform_device *pdev)
{
component_master_del(&pdev->dev, &sun4i_drv_master_ops);
}
static void sun4i_drv_shutdown(struct platform_device *pdev)
{
drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
}
static const struct of_device_id sun4i_drv_of_table[] = {
{ .compatible = "allwinner,sun4i-a10-display-engine" },
{ .compatible = "allwinner,sun5i-a10s-display-engine" },
{ .compatible = "allwinner,sun5i-a13-display-engine" },
{ .compatible = "allwinner,sun6i-a31-display-engine" },
{ .compatible = "allwinner,sun6i-a31s-display-engine" },
{ .compatible = "allwinner,sun7i-a20-display-engine" },
{ .compatible = "allwinner,sun8i-a23-display-engine" },
{ .compatible = "allwinner,sun8i-a33-display-engine" },
{ .compatible = "allwinner,sun8i-a83t-display-engine" },
{ .compatible = "allwinner,sun8i-h3-display-engine" },
{ .compatible = "allwinner,sun8i-r40-display-engine" },
{ .compatible = "allwinner,sun8i-v3s-display-engine" },
{ .compatible = "allwinner,sun9i-a80-display-engine" },
{ .compatible = "allwinner,sun20i-d1-display-engine" },
{ .compatible = "allwinner,sun50i-a64-display-engine" },
{ .compatible = "allwinner,sun50i-h6-display-engine" },
{ }
};
MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
static struct platform_driver sun4i_drv_platform_driver = {
.probe = sun4i_drv_probe,
.remove_new = sun4i_drv_remove,
.shutdown = sun4i_drv_shutdown,
.driver = {
.name = "sun4i-drm",
.of_match_table = sun4i_drv_of_table,
.pm = &sun4i_drv_drm_pm_ops,
},
};
drm_module_platform_driver(sun4i_drv_platform_driver);
MODULE_AUTHOR("Boris Brezillon <[email protected]>");
MODULE_AUTHOR("Maxime Ripard <[email protected]>");
MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
MODULE_LICENSE("GPL");
Codebase Browser
linux