378 lines
10 KiB
C
378 lines
10 KiB
C
/*
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* Copyright (C) 2015 Free Electrons
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* Copyright (C) 2015 NextThing Co
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*
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* Maxime Ripard <maxime.ripard@free-electrons.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*/
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#include <linux/component.h>
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#include <linux/kfifo.h>
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#include <linux/of_graph.h>
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#include <linux/of_reserved_mem.h>
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#include <drm/drmP.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_fb_cma_helper.h>
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#include <drm/drm_gem_cma_helper.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_of.h>
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#include "sun4i_drv.h"
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#include "sun4i_framebuffer.h"
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#include "sun4i_tcon.h"
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static void sun4i_drv_lastclose(struct drm_device *dev)
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{
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struct sun4i_drv *drv = dev->dev_private;
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drm_fbdev_cma_restore_mode(drv->fbdev);
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}
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DEFINE_DRM_GEM_CMA_FOPS(sun4i_drv_fops);
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static struct drm_driver sun4i_drv_driver = {
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.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
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/* Generic Operations */
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.lastclose = sun4i_drv_lastclose,
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.fops = &sun4i_drv_fops,
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.name = "sun4i-drm",
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.desc = "Allwinner sun4i Display Engine",
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.date = "20150629",
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.major = 1,
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.minor = 0,
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/* GEM Operations */
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.dumb_create = drm_gem_cma_dumb_create,
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.gem_free_object_unlocked = drm_gem_cma_free_object,
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.gem_vm_ops = &drm_gem_cma_vm_ops,
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/* PRIME Operations */
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.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
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.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
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.gem_prime_import = drm_gem_prime_import,
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.gem_prime_export = drm_gem_prime_export,
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.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
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.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
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.gem_prime_vmap = drm_gem_cma_prime_vmap,
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.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
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.gem_prime_mmap = drm_gem_cma_prime_mmap,
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/* Frame Buffer Operations */
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};
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static void sun4i_remove_framebuffers(void)
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{
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struct apertures_struct *ap;
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ap = alloc_apertures(1);
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if (!ap)
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return;
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/* The framebuffer can be located anywhere in RAM */
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ap->ranges[0].base = 0;
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ap->ranges[0].size = ~0;
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drm_fb_helper_remove_conflicting_framebuffers(ap, "sun4i-drm-fb", false);
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kfree(ap);
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}
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static int sun4i_drv_bind(struct device *dev)
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{
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struct drm_device *drm;
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struct sun4i_drv *drv;
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int ret;
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drm = drm_dev_alloc(&sun4i_drv_driver, dev);
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if (IS_ERR(drm))
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return PTR_ERR(drm);
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drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
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if (!drv) {
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ret = -ENOMEM;
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goto free_drm;
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}
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drm->dev_private = drv;
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INIT_LIST_HEAD(&drv->engine_list);
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INIT_LIST_HEAD(&drv->tcon_list);
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ret = of_reserved_mem_device_init(dev);
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if (ret && ret != -ENODEV) {
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dev_err(drm->dev, "Couldn't claim our memory region\n");
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goto free_drm;
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}
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drm_mode_config_init(drm);
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ret = component_bind_all(drm->dev, drm);
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if (ret) {
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dev_err(drm->dev, "Couldn't bind all pipelines components\n");
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goto cleanup_mode_config;
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}
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/* drm_vblank_init calls kcalloc, which can fail */
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ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
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if (ret)
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goto free_mem_region;
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drm->irq_enabled = true;
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/* Remove early framebuffers (ie. simplefb) */
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sun4i_remove_framebuffers();
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/* Create our framebuffer */
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drv->fbdev = sun4i_framebuffer_init(drm);
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if (IS_ERR(drv->fbdev)) {
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dev_err(drm->dev, "Couldn't create our framebuffer\n");
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ret = PTR_ERR(drv->fbdev);
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goto cleanup_mode_config;
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}
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/* Enable connectors polling */
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drm_kms_helper_poll_init(drm);
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ret = drm_dev_register(drm, 0);
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if (ret)
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goto finish_poll;
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return 0;
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finish_poll:
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drm_kms_helper_poll_fini(drm);
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sun4i_framebuffer_free(drm);
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cleanup_mode_config:
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drm_mode_config_cleanup(drm);
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free_mem_region:
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of_reserved_mem_device_release(dev);
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free_drm:
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drm_dev_unref(drm);
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return ret;
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}
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static void sun4i_drv_unbind(struct device *dev)
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{
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struct drm_device *drm = dev_get_drvdata(dev);
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drm_dev_unregister(drm);
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drm_kms_helper_poll_fini(drm);
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sun4i_framebuffer_free(drm);
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drm_mode_config_cleanup(drm);
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of_reserved_mem_device_release(dev);
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drm_dev_unref(drm);
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}
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static const struct component_master_ops sun4i_drv_master_ops = {
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.bind = sun4i_drv_bind,
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.unbind = sun4i_drv_unbind,
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};
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static bool sun4i_drv_node_is_connector(struct device_node *node)
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{
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return of_device_is_compatible(node, "hdmi-connector");
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}
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static bool sun4i_drv_node_is_frontend(struct device_node *node)
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{
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return of_device_is_compatible(node, "allwinner,suniv-display-frontend") ||
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of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||
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of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||
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of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||
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of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||
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of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend");
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}
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static bool sun4i_drv_node_is_tcon(struct device_node *node)
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{
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return of_device_is_compatible(node, "allwinner,suniv-tcon") ||
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of_device_is_compatible(node, "allwinner,sun4i-a10-tcon") ||
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of_device_is_compatible(node, "allwinner,sun5i-a13-tcon") ||
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of_device_is_compatible(node, "allwinner,sun6i-a31-tcon") ||
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of_device_is_compatible(node, "allwinner,sun6i-a31s-tcon") ||
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of_device_is_compatible(node, "allwinner,sun7i-a20-tcon") ||
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of_device_is_compatible(node, "allwinner,sun8i-a33-tcon") ||
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of_device_is_compatible(node, "allwinner,sun8i-v3s-tcon");
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}
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static int compare_of(struct device *dev, void *data)
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{
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DRM_DEBUG_DRIVER("Comparing of node %pOF with %pOF\n",
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dev->of_node,
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data);
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return dev->of_node == data;
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}
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/*
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* The encoder drivers use drm_of_find_possible_crtcs to get upstream
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* crtcs from the device tree using of_graph. For the results to be
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* correct, encoders must be probed/bound after _all_ crtcs have been
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* created. The existing code uses a depth first recursive traversal
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* of the of_graph, which means the encoders downstream of the TCON
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* get add right after the first TCON. The second TCON or CRTC will
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* never be properly associated with encoders connected to it.
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*
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* Also, in a dual display pipeline setup, both frontends can feed
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* either backend, and both backends can feed either TCON, we want
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* all components of the same type to be added before the next type
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* in the pipeline. Fortunately, the pipelines are perfectly symmetric,
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* i.e. components of the same type are at the same depth when counted
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* from the frontend. The only exception is the third pipeline in
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* the A80 SoC, which we do not support anyway.
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*
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* Hence we can use a breadth first search traversal order to add
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* components. We do not need to check for duplicates. The component
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* matching system handles this for us.
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*/
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struct endpoint_list {
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DECLARE_KFIFO(fifo, struct device_node *, 16);
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};
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static int sun4i_drv_add_endpoints(struct device *dev,
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struct endpoint_list *list,
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struct component_match **match,
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struct device_node *node)
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{
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struct device_node *port, *ep, *remote;
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int count = 0;
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/*
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* We don't support the frontend for now, so we will never
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* have a device bound. Just skip over it, but we still want
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* the rest our pipeline to be added.
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*/
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if (!sun4i_drv_node_is_frontend(node) &&
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!of_device_is_available(node))
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return 0;
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/*
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* The connectors will be the last nodes in our pipeline, we
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* can just bail out.
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*/
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if (sun4i_drv_node_is_connector(node))
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return 0;
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if (!sun4i_drv_node_is_frontend(node)) {
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/* Add current component */
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DRM_DEBUG_DRIVER("Adding component %pOF\n", node);
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drm_of_component_match_add(dev, match, compare_of, node);
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count++;
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}
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/* Inputs are listed first, then outputs */
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port = of_graph_get_port_by_id(node, 1);
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if (!port) {
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DRM_DEBUG_DRIVER("No output to bind\n");
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return count;
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}
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for_each_available_child_of_node(port, ep) {
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remote = of_graph_get_remote_port_parent(ep);
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if (!remote) {
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DRM_DEBUG_DRIVER("Error retrieving the output node\n");
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of_node_put(remote);
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continue;
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}
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/*
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* If the node is our TCON, the first port is used for
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* panel or bridges, and will not be part of the
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* component framework.
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*/
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if (sun4i_drv_node_is_tcon(node)) {
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struct of_endpoint endpoint;
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if (of_graph_parse_endpoint(ep, &endpoint)) {
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DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");
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continue;
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}
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if (!endpoint.id) {
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DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");
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continue;
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}
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}
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kfifo_put(&list->fifo, remote);
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}
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return count;
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}
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static int sun4i_drv_probe(struct platform_device *pdev)
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{
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struct component_match *match = NULL;
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struct device_node *np = pdev->dev.of_node, *endpoint;
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struct endpoint_list list;
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int i, ret, count = 0;
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INIT_KFIFO(list.fifo);
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for (i = 0;; i++) {
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struct device_node *pipeline = of_parse_phandle(np,
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"allwinner,pipelines",
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i);
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if (!pipeline)
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break;
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kfifo_put(&list.fifo, pipeline);
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}
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while (kfifo_get(&list.fifo, &endpoint)) {
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/* process this endpoint */
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ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,
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endpoint);
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/* sun4i_drv_add_endpoints can fail to allocate memory */
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if (ret < 0)
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return ret;
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count += ret;
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}
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if (count)
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return component_master_add_with_match(&pdev->dev,
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&sun4i_drv_master_ops,
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match);
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else
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return 0;
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}
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static int sun4i_drv_remove(struct platform_device *pdev)
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{
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return 0;
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}
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static const struct of_device_id sun4i_drv_of_table[] = {
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{ .compatible = "allwinner,suniv-display-engine" },
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{ .compatible = "allwinner,sun4i-a10-display-engine" },
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{ .compatible = "allwinner,sun5i-a10s-display-engine" },
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{ .compatible = "allwinner,sun5i-a13-display-engine" },
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{ .compatible = "allwinner,sun6i-a31-display-engine" },
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{ .compatible = "allwinner,sun6i-a31s-display-engine" },
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{ .compatible = "allwinner,sun7i-a20-display-engine" },
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{ .compatible = "allwinner,sun8i-a33-display-engine" },
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{ .compatible = "allwinner,sun8i-v3s-display-engine" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);
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static struct platform_driver sun4i_drv_platform_driver = {
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.probe = sun4i_drv_probe,
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.remove = sun4i_drv_remove,
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.driver = {
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.name = "sun4i-drm",
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.of_match_table = sun4i_drv_of_table,
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},
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};
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module_platform_driver(sun4i_drv_platform_driver);
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MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
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MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
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MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");
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MODULE_LICENSE("GPL");
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