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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (C) 2015 Free Electrons4 * Copyright (C) 2015 NextThing Co5 *6 * Maxime Ripard <maxime.ripard@free-electrons.com>7 */8 9#include <linux/component.h>10#include <linux/dma-mapping.h>11#include <linux/kfifo.h>12#include <linux/module.h>13#include <linux/of_graph.h>14#include <linux/of_reserved_mem.h>15#include <linux/platform_device.h>16 17#include <drm/drm_aperture.h>18#include <drm/drm_atomic_helper.h>19#include <drm/drm_drv.h>20#include <drm/drm_fbdev_dma.h>21#include <drm/drm_gem_dma_helper.h>22#include <drm/drm_module.h>23#include <drm/drm_of.h>24#include <drm/drm_probe_helper.h>25#include <drm/drm_vblank.h>26 27#include "sun4i_drv.h"28#include "sun4i_frontend.h"29#include "sun4i_framebuffer.h"30#include "sun4i_tcon.h"31#include "sun8i_tcon_top.h"32 33static int drm_sun4i_gem_dumb_create(struct drm_file *file_priv,34 struct drm_device *drm,35 struct drm_mode_create_dumb *args)36{37 /* The hardware only allows even pitches for YUV buffers. */38 args->pitch = ALIGN(DIV_ROUND_UP(args->width * args->bpp, 8), 2);39 40 return drm_gem_dma_dumb_create_internal(file_priv, drm, args);41}42 43DEFINE_DRM_GEM_DMA_FOPS(sun4i_drv_fops);44 45static const struct drm_driver sun4i_drv_driver = {46 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,47 48 /* Generic Operations */49 .fops = &sun4i_drv_fops,50 .name = "sun4i-drm",51 .desc = "Allwinner sun4i Display Engine",52 .date = "20150629",53 .major = 1,54 .minor = 0,55 56 /* GEM Operations */57 DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(drm_sun4i_gem_dumb_create),58};59 60static int sun4i_drv_bind(struct device *dev)61{62 struct drm_device *drm;63 struct sun4i_drv *drv;64 int ret;65 66 drm = drm_dev_alloc(&sun4i_drv_driver, dev);67 if (IS_ERR(drm))68 return PTR_ERR(drm);69 70 drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);71 if (!drv) {72 ret = -ENOMEM;73 goto free_drm;74 }75 76 drm->dev_private = drv;77 INIT_LIST_HEAD(&drv->frontend_list);78 INIT_LIST_HEAD(&drv->engine_list);79 INIT_LIST_HEAD(&drv->tcon_list);80 81 ret = of_reserved_mem_device_init(dev);82 if (ret && ret != -ENODEV) {83 dev_err(drm->dev, "Couldn't claim our memory region\n");84 goto free_drm;85 }86 87 drm_mode_config_init(drm);88 89 ret = component_bind_all(drm->dev, drm);90 if (ret) {91 dev_err(drm->dev, "Couldn't bind all pipelines components\n");92 goto cleanup_mode_config;93 }94 95 /* drm_vblank_init calls kcalloc, which can fail */96 ret = drm_vblank_init(drm, drm->mode_config.num_crtc);97 if (ret)98 goto unbind_all;99 100 /* Remove early framebuffers (ie. simplefb) */101 ret = drm_aperture_remove_framebuffers(&sun4i_drv_driver);102 if (ret)103 goto unbind_all;104 105 sun4i_framebuffer_init(drm);106 107 /* Enable connectors polling */108 drm_kms_helper_poll_init(drm);109 110 ret = drm_dev_register(drm, 0);111 if (ret)112 goto finish_poll;113 114 drm_fbdev_dma_setup(drm, 32);115 116 dev_set_drvdata(dev, drm);117 118 return 0;119 120finish_poll:121 drm_kms_helper_poll_fini(drm);122unbind_all:123 component_unbind_all(dev, NULL);124cleanup_mode_config:125 drm_mode_config_cleanup(drm);126 of_reserved_mem_device_release(dev);127free_drm:128 drm_dev_put(drm);129 return ret;130}131 132static void sun4i_drv_unbind(struct device *dev)133{134 struct drm_device *drm = dev_get_drvdata(dev);135 136 dev_set_drvdata(dev, NULL);137 drm_dev_unregister(drm);138 drm_kms_helper_poll_fini(drm);139 drm_atomic_helper_shutdown(drm);140 drm_mode_config_cleanup(drm);141 142 component_unbind_all(dev, NULL);143 of_reserved_mem_device_release(dev);144 145 drm_dev_put(drm);146}147 148static const struct component_master_ops sun4i_drv_master_ops = {149 .bind = sun4i_drv_bind,150 .unbind = sun4i_drv_unbind,151};152 153static bool sun4i_drv_node_is_connector(struct device_node *node)154{155 return of_device_is_compatible(node, "hdmi-connector");156}157 158static bool sun4i_drv_node_is_frontend(struct device_node *node)159{160 return of_device_is_compatible(node, "allwinner,sun4i-a10-display-frontend") ||161 of_device_is_compatible(node, "allwinner,sun5i-a13-display-frontend") ||162 of_device_is_compatible(node, "allwinner,sun6i-a31-display-frontend") ||163 of_device_is_compatible(node, "allwinner,sun7i-a20-display-frontend") ||164 of_device_is_compatible(node, "allwinner,sun8i-a23-display-frontend") ||165 of_device_is_compatible(node, "allwinner,sun8i-a33-display-frontend") ||166 of_device_is_compatible(node, "allwinner,sun9i-a80-display-frontend");167}168 169static bool sun4i_drv_node_is_deu(struct device_node *node)170{171 return of_device_is_compatible(node, "allwinner,sun9i-a80-deu");172}173 174static bool sun4i_drv_node_is_supported_frontend(struct device_node *node)175{176 if (IS_ENABLED(CONFIG_DRM_SUN4I_BACKEND))177 return !!of_match_node(sun4i_frontend_of_table, node);178 179 return false;180}181 182static bool sun4i_drv_node_is_tcon(struct device_node *node)183{184 return !!of_match_node(sun4i_tcon_of_table, node);185}186 187static bool sun4i_drv_node_is_tcon_with_ch0(struct device_node *node)188{189 const struct of_device_id *match;190 191 match = of_match_node(sun4i_tcon_of_table, node);192 if (match) {193 struct sun4i_tcon_quirks *quirks;194 195 quirks = (struct sun4i_tcon_quirks *)match->data;196 197 return quirks->has_channel_0;198 }199 200 return false;201}202 203static bool sun4i_drv_node_is_tcon_top(struct device_node *node)204{205 return IS_ENABLED(CONFIG_DRM_SUN8I_TCON_TOP) &&206 !!of_match_node(sun8i_tcon_top_of_table, node);207}208 209/*210 * The encoder drivers use drm_of_find_possible_crtcs to get upstream211 * crtcs from the device tree using of_graph. For the results to be212 * correct, encoders must be probed/bound after _all_ crtcs have been213 * created. The existing code uses a depth first recursive traversal214 * of the of_graph, which means the encoders downstream of the TCON215 * get add right after the first TCON. The second TCON or CRTC will216 * never be properly associated with encoders connected to it.217 *218 * Also, in a dual display pipeline setup, both frontends can feed219 * either backend, and both backends can feed either TCON, we want220 * all components of the same type to be added before the next type221 * in the pipeline. Fortunately, the pipelines are perfectly symmetric,222 * i.e. components of the same type are at the same depth when counted223 * from the frontend. The only exception is the third pipeline in224 * the A80 SoC, which we do not support anyway.225 *226 * Hence we can use a breadth first search traversal order to add227 * components. We do not need to check for duplicates. The component228 * matching system handles this for us.229 */230struct endpoint_list {231 DECLARE_KFIFO(fifo, struct device_node *, 16);232};233 234static void sun4i_drv_traverse_endpoints(struct endpoint_list *list,235 struct device_node *node,236 int port_id)237{238 struct device_node *ep, *remote, *port;239 240 port = of_graph_get_port_by_id(node, port_id);241 if (!port) {242 DRM_DEBUG_DRIVER("No output to bind on port %d\n", port_id);243 return;244 }245 246 for_each_available_child_of_node(port, ep) {247 remote = of_graph_get_remote_port_parent(ep);248 if (!remote) {249 DRM_DEBUG_DRIVER("Error retrieving the output node\n");250 continue;251 }252 253 if (sun4i_drv_node_is_tcon(node)) {254 /*255 * TCON TOP is always probed before TCON. However, TCON256 * points back to TCON TOP when it is source for HDMI.257 * We have to skip it here to prevent infinite looping258 * between TCON TOP and TCON.259 */260 if (sun4i_drv_node_is_tcon_top(remote)) {261 DRM_DEBUG_DRIVER("TCON output endpoint is TCON TOP... skipping\n");262 of_node_put(remote);263 continue;264 }265 266 /*267 * If the node is our TCON with channel 0, the first268 * port is used for panel or bridges, and will not be269 * part of the component framework.270 */271 if (sun4i_drv_node_is_tcon_with_ch0(node)) {272 struct of_endpoint endpoint;273 274 if (of_graph_parse_endpoint(ep, &endpoint)) {275 DRM_DEBUG_DRIVER("Couldn't parse endpoint\n");276 of_node_put(remote);277 continue;278 }279 280 if (!endpoint.id) {281 DRM_DEBUG_DRIVER("Endpoint is our panel... skipping\n");282 of_node_put(remote);283 continue;284 }285 }286 }287 288 kfifo_put(&list->fifo, remote);289 }290}291 292static int sun4i_drv_add_endpoints(struct device *dev,293 struct endpoint_list *list,294 struct component_match **match,295 struct device_node *node)296{297 int count = 0;298 299 /*300 * The frontend has been disabled in some of our old device301 * trees. If we find a node that is the frontend and is302 * disabled, we should just follow through and parse its303 * child, but without adding it to the component list.304 * Otherwise, we obviously want to add it to the list.305 */306 if (!sun4i_drv_node_is_frontend(node) &&307 !of_device_is_available(node))308 return 0;309 310 /*311 * The connectors will be the last nodes in our pipeline, we312 * can just bail out.313 */314 if (sun4i_drv_node_is_connector(node))315 return 0;316 317 /*318 * If the device is either just a regular device, or an319 * enabled frontend supported by the driver, we add it to our320 * component list.321 */322 if (!(sun4i_drv_node_is_frontend(node) ||323 sun4i_drv_node_is_deu(node)) ||324 (sun4i_drv_node_is_supported_frontend(node) &&325 of_device_is_available(node))) {326 /* Add current component */327 DRM_DEBUG_DRIVER("Adding component %pOF\n", node);328 drm_of_component_match_add(dev, match, component_compare_of, node);329 count++;330 }331 332 /* each node has at least one output */333 sun4i_drv_traverse_endpoints(list, node, 1);334 335 /* TCON TOP has second and third output */336 if (sun4i_drv_node_is_tcon_top(node)) {337 sun4i_drv_traverse_endpoints(list, node, 3);338 sun4i_drv_traverse_endpoints(list, node, 5);339 }340 341 return count;342}343 344#ifdef CONFIG_PM_SLEEP345static int sun4i_drv_drm_sys_suspend(struct device *dev)346{347 struct drm_device *drm = dev_get_drvdata(dev);348 349 return drm_mode_config_helper_suspend(drm);350}351 352static int sun4i_drv_drm_sys_resume(struct device *dev)353{354 struct drm_device *drm = dev_get_drvdata(dev);355 356 return drm_mode_config_helper_resume(drm);357}358#endif359 360static const struct dev_pm_ops sun4i_drv_drm_pm_ops = {361 SET_SYSTEM_SLEEP_PM_OPS(sun4i_drv_drm_sys_suspend,362 sun4i_drv_drm_sys_resume)363};364 365static int sun4i_drv_probe(struct platform_device *pdev)366{367 struct component_match *match = NULL;368 struct device_node *np = pdev->dev.of_node, *endpoint;369 struct endpoint_list list;370 int i, ret, count = 0;371 372 INIT_KFIFO(list.fifo);373 374 /*375 * DE2 and DE3 cores actually supports 40-bit addresses, but376 * driver does not.377 */378 dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));379 dma_set_max_seg_size(&pdev->dev, UINT_MAX);380 381 for (i = 0;; i++) {382 struct device_node *pipeline = of_parse_phandle(np,383 "allwinner,pipelines",384 i);385 if (!pipeline)386 break;387 388 kfifo_put(&list.fifo, pipeline);389 }390 391 while (kfifo_get(&list.fifo, &endpoint)) {392 /* process this endpoint */393 ret = sun4i_drv_add_endpoints(&pdev->dev, &list, &match,394 endpoint);395 396 /* sun4i_drv_add_endpoints can fail to allocate memory */397 if (ret < 0)398 return ret;399 400 count += ret;401 }402 403 if (count)404 return component_master_add_with_match(&pdev->dev,405 &sun4i_drv_master_ops,406 match);407 else408 return 0;409}410 411static void sun4i_drv_remove(struct platform_device *pdev)412{413 component_master_del(&pdev->dev, &sun4i_drv_master_ops);414}415 416static void sun4i_drv_shutdown(struct platform_device *pdev)417{418 drm_atomic_helper_shutdown(platform_get_drvdata(pdev));419}420 421static const struct of_device_id sun4i_drv_of_table[] = {422 { .compatible = "allwinner,sun4i-a10-display-engine" },423 { .compatible = "allwinner,sun5i-a10s-display-engine" },424 { .compatible = "allwinner,sun5i-a13-display-engine" },425 { .compatible = "allwinner,sun6i-a31-display-engine" },426 { .compatible = "allwinner,sun6i-a31s-display-engine" },427 { .compatible = "allwinner,sun7i-a20-display-engine" },428 { .compatible = "allwinner,sun8i-a23-display-engine" },429 { .compatible = "allwinner,sun8i-a33-display-engine" },430 { .compatible = "allwinner,sun8i-a83t-display-engine" },431 { .compatible = "allwinner,sun8i-h3-display-engine" },432 { .compatible = "allwinner,sun8i-r40-display-engine" },433 { .compatible = "allwinner,sun8i-v3s-display-engine" },434 { .compatible = "allwinner,sun9i-a80-display-engine" },435 { .compatible = "allwinner,sun20i-d1-display-engine" },436 { .compatible = "allwinner,sun50i-a64-display-engine" },437 { .compatible = "allwinner,sun50i-h6-display-engine" },438 { }439};440MODULE_DEVICE_TABLE(of, sun4i_drv_of_table);441 442static struct platform_driver sun4i_drv_platform_driver = {443 .probe = sun4i_drv_probe,444 .remove_new = sun4i_drv_remove,445 .shutdown = sun4i_drv_shutdown,446 .driver = {447 .name = "sun4i-drm",448 .of_match_table = sun4i_drv_of_table,449 .pm = &sun4i_drv_drm_pm_ops,450 },451};452drm_module_platform_driver(sun4i_drv_platform_driver);453 454MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");455MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");456MODULE_DESCRIPTION("Allwinner A10 Display Engine DRM/KMS Driver");457MODULE_LICENSE("GPL");458