drivers/gpu/drm/arm/display/komeda/komeda_dev.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
   4  * Author: James.Qian.Wang <james.qian.wang@arm.com>
   5  *
   6  */
   7 #include <linux/io.h>
   8 #include <linux/iommu.h>
   9 #include <linux/of_device.h>
  10 #include <linux/of_graph.h>
  11 #include <linux/of_reserved_mem.h>
  12 #include <linux/platform_device.h>
  13 #include <linux/pm_runtime.h>
  14 #include <linux/dma-mapping.h>
  15 #ifdef CONFIG_DEBUG_FS
  16 #include <linux/debugfs.h>
  17 #include <linux/seq_file.h>
  18 #endif
  19
  20 #include <drm/drm_print.h>
  21
  22 #include "komeda_dev.h"
  23
  24 static int komeda_register_show(struct seq_file *sf, void *x)
  25 {
  26         struct komeda_dev *mdev = sf->private;
  27         int i;
  28
  29         seq_puts(sf, "\n====== Komeda register dump =========\n");
  30
  31         pm_runtime_get_sync(mdev->dev);
  32
  33         if (mdev->funcs->dump_register)
  34                 mdev->funcs->dump_register(mdev, sf);
  35
  36         for (i = 0; i < mdev->n_pipelines; i++)
  37                 komeda_pipeline_dump_register(mdev->pipelines[i], sf);
  38
  39         pm_runtime_put(mdev->dev);
  40
  41         return 0;
  42 }
  43
  44 DEFINE_SHOW_ATTRIBUTE(komeda_register);
  45
  46 #ifdef CONFIG_DEBUG_FS
  47 static void komeda_debugfs_init(struct komeda_dev *mdev)
  48 {
  49         if (!debugfs_initialized())
  50                 return;
  51
  52         mdev->debugfs_root = debugfs_create_dir("komeda", NULL);
  53         debugfs_create_file("register", 0444, mdev->debugfs_root,
  54                             mdev, &komeda_register_fops);
  55         debugfs_create_x16("err_verbosity", 0664, mdev->debugfs_root,
  56                            &mdev->err_verbosity);
  57 }
  58 #endif
  59
  60 static ssize_t
  61 core_id_show(struct device *dev, struct device_attribute *attr, char *buf)
  62 {
  63         struct komeda_dev *mdev = dev_to_mdev(dev);
  64
  65         return snprintf(buf, PAGE_SIZE, "0x%08x\n", mdev->chip.core_id);
  66 }
  67 static DEVICE_ATTR_RO(core_id);
  68
  69 static ssize_t
  70 config_id_show(struct device *dev, struct device_attribute *attr, char *buf)
  71 {
  72         struct komeda_dev *mdev = dev_to_mdev(dev);
  73         struct komeda_pipeline *pipe = mdev->pipelines[0];
  74         union komeda_config_id config_id;
  75         int i;
  76
  77         memset(&config_id, 0, sizeof(config_id));
  78
  79         config_id.max_line_sz = pipe->layers[0]->hsize_in.end;
  80         config_id.n_pipelines = mdev->n_pipelines;
  81         config_id.n_scalers = pipe->n_scalers;
  82         config_id.n_layers = pipe->n_layers;
  83         config_id.n_richs = 0;
  84         for (i = 0; i < pipe->n_layers; i++) {
  85                 if (pipe->layers[i]->layer_type == KOMEDA_FMT_RICH_LAYER)
  86                         config_id.n_richs++;
  87         }
  88         return snprintf(buf, PAGE_SIZE, "0x%08x\n", config_id.value);
  89 }
  90 static DEVICE_ATTR_RO(config_id);
  91
  92 static ssize_t
  93 aclk_hz_show(struct device *dev, struct device_attribute *attr, char *buf)
  94 {
  95         struct komeda_dev *mdev = dev_to_mdev(dev);
  96
  97         return snprintf(buf, PAGE_SIZE, "%lu\n", clk_get_rate(mdev->aclk));
  98 }
  99 static DEVICE_ATTR_RO(aclk_hz);
 100
 101 static struct attribute *komeda_sysfs_entries[] = {
 102         &dev_attr_core_id.attr,
 103         &dev_attr_config_id.attr,
 104         &dev_attr_aclk_hz.attr,
 105         NULL,
 106 };
 107
 108 static struct attribute_group komeda_sysfs_attr_group = {
 109         .attrs = komeda_sysfs_entries,
 110 };
 111
 112 static int komeda_parse_pipe_dt(struct komeda_pipeline *pipe)
 113 {
 114         struct device_node *np = pipe->of_node;
 115         struct clk *clk;
 116
 117         clk = of_clk_get_by_name(np, "pxclk");
 118         if (IS_ERR(clk)) {
 119                 DRM_ERROR("get pxclk for pipeline %d failed!\n", pipe->id);
 120                 return PTR_ERR(clk);
 121         }
 122         pipe->pxlclk = clk;
 123
 124         /* enum ports */
 125         pipe->of_output_links[0] =
 126                 of_graph_get_remote_node(np, KOMEDA_OF_PORT_OUTPUT, 0);
 127         pipe->of_output_links[1] =
 128                 of_graph_get_remote_node(np, KOMEDA_OF_PORT_OUTPUT, 1);
 129         pipe->of_output_port =
 130                 of_graph_get_port_by_id(np, KOMEDA_OF_PORT_OUTPUT);
 131
 132         pipe->dual_link = pipe->of_output_links[0] && pipe->of_output_links[1];
 133
 134         return 0;
 135 }
 136
 137 static int komeda_parse_dt(struct device *dev, struct komeda_dev *mdev)
 138 {
 139         struct platform_device *pdev = to_platform_device(dev);
 140         struct device_node *child, *np = dev->of_node;
 141         struct komeda_pipeline *pipe;
 142         u32 pipe_id = U32_MAX;
 143         int ret = -1;
 144
 145         mdev->irq  = platform_get_irq(pdev, 0);
 146         if (mdev->irq < 0) {
 147                 DRM_ERROR("could not get IRQ number.\n");
 148                 return mdev->irq;
 149         }
 150
 151         /* Get the optional framebuffer memory resource */
 152         ret = of_reserved_mem_device_init(dev);
 153         if (ret && ret != -ENODEV)
 154                 return ret;
 155
 156         for_each_available_child_of_node(np, child) {
 157                 if (of_node_name_eq(child, "pipeline")) {
 158                         of_property_read_u32(child, "reg", &pipe_id);
 159                         if (pipe_id >= mdev->n_pipelines) {
 160                                 DRM_WARN("Skip the redundant DT node: pipeline-%u.\n",
 161                                          pipe_id);
 162                                 continue;
 163                         }
 164                         mdev->pipelines[pipe_id]->of_node = of_node_get(child);
 165                 }
 166         }
 167
 168         for (pipe_id = 0; pipe_id < mdev->n_pipelines; pipe_id++) {
 169                 pipe = mdev->pipelines[pipe_id];
 170
 171                 if (!pipe->of_node) {
 172                         DRM_ERROR("Pipeline-%d doesn't have a DT node.\n",
 173                                   pipe->id);
 174                         return -EINVAL;
 175                 }
 176                 ret = komeda_parse_pipe_dt(pipe);
 177                 if (ret)
 178                         return ret;
 179         }
 180
 181         return 0;
 182 }
 183
 184 struct komeda_dev *komeda_dev_create(struct device *dev)
 185 {
 186         struct platform_device *pdev = to_platform_device(dev);
 187         komeda_identify_func komeda_identify;
 188         struct komeda_dev *mdev;
 189         int err = 0;
 190
 191         komeda_identify = of_device_get_match_data(dev);
 192         if (!komeda_identify)
 193                 return ERR_PTR(-ENODEV);
 194
 195         mdev = devm_kzalloc(dev, sizeof(*mdev), GFP_KERNEL);
 196         if (!mdev)
 197                 return ERR_PTR(-ENOMEM);
 198
 199         mutex_init(&mdev->lock);
 200
 201         mdev->dev = dev;
 202         mdev->reg_base = devm_platform_ioremap_resource(pdev, 0);
 203         if (IS_ERR(mdev->reg_base)) {
 204                 DRM_ERROR("Map register space failed.\n");
 205                 err = PTR_ERR(mdev->reg_base);
 206                 mdev->reg_base = NULL;
 207                 goto err_cleanup;
 208         }
 209
 210         mdev->aclk = devm_clk_get(dev, "aclk");
 211         if (IS_ERR(mdev->aclk)) {
 212                 DRM_ERROR("Get engine clk failed.\n");
 213                 err = PTR_ERR(mdev->aclk);
 214                 mdev->aclk = NULL;
 215                 goto err_cleanup;
 216         }
 217
 218         clk_prepare_enable(mdev->aclk);
 219
 220         mdev->funcs = komeda_identify(mdev->reg_base, &mdev->chip);
 221         if (!mdev->funcs) {
 222                 DRM_ERROR("Failed to identify the HW.\n");
 223                 err = -ENODEV;
 224                 goto disable_clk;
 225         }
 226
 227         DRM_INFO("Found ARM Mali-D%x version r%dp%d\n",
 228                  MALIDP_CORE_ID_PRODUCT_ID(mdev->chip.core_id),
 229                  MALIDP_CORE_ID_MAJOR(mdev->chip.core_id),
 230                  MALIDP_CORE_ID_MINOR(mdev->chip.core_id));
 231
 232         mdev->funcs->init_format_table(mdev);
 233
 234         err = mdev->funcs->enum_resources(mdev);
 235         if (err) {
 236                 DRM_ERROR("enumerate display resource failed.\n");
 237                 goto disable_clk;
 238         }
 239
 240         err = komeda_parse_dt(dev, mdev);
 241         if (err) {
 242                 DRM_ERROR("parse device tree failed.\n");
 243                 goto disable_clk;
 244         }
 245
 246         err = komeda_assemble_pipelines(mdev);
 247         if (err) {
 248                 DRM_ERROR("assemble display pipelines failed.\n");
 249                 goto disable_clk;
 250         }
 251
 252         dma_set_max_seg_size(dev, U32_MAX);
 253
 254         mdev->iommu = iommu_get_domain_for_dev(mdev->dev);
 255         if (!mdev->iommu)
 256                 DRM_INFO("continue without IOMMU support!\n");
 257
 258         clk_disable_unprepare(mdev->aclk);
 259
 260         err = sysfs_create_group(&dev->kobj, &komeda_sysfs_attr_group);
 261         if (err) {
 262                 DRM_ERROR("create sysfs group failed.\n");
 263                 goto err_cleanup;
 264         }
 265
 266         mdev->err_verbosity = KOMEDA_DEV_PRINT_ERR_EVENTS;
 267
 268 #ifdef CONFIG_DEBUG_FS
 269         komeda_debugfs_init(mdev);
 270 #endif
 271
 272         return mdev;
 273
 274 disable_clk:
 275         clk_disable_unprepare(mdev->aclk);
 276 err_cleanup:
 277         komeda_dev_destroy(mdev);
 278         return ERR_PTR(err);
 279 }
 280
 281 void komeda_dev_destroy(struct komeda_dev *mdev)
 282 {
 283         struct device *dev = mdev->dev;
 284         const struct komeda_dev_funcs *funcs = mdev->funcs;
 285         int i;
 286
 287         sysfs_remove_group(&dev->kobj, &komeda_sysfs_attr_group);
 288
 289 #ifdef CONFIG_DEBUG_FS
 290         debugfs_remove_recursive(mdev->debugfs_root);
 291 #endif
 292
 293         if (mdev->aclk)
 294                 clk_prepare_enable(mdev->aclk);
 295
 296         for (i = 0; i < mdev->n_pipelines; i++) {
 297                 komeda_pipeline_destroy(mdev, mdev->pipelines[i]);
 298                 mdev->pipelines[i] = NULL;
 299         }
 300
 301         mdev->n_pipelines = 0;
 302
 303         of_reserved_mem_device_release(dev);
 304
 305         if (funcs && funcs->cleanup)
 306                 funcs->cleanup(mdev);
 307
 308         if (mdev->reg_base) {
 309                 devm_iounmap(dev, mdev->reg_base);
 310                 mdev->reg_base = NULL;
 311         }
 312
 313         if (mdev->aclk) {
 314                 clk_disable_unprepare(mdev->aclk);
 315                 devm_clk_put(dev, mdev->aclk);
 316                 mdev->aclk = NULL;
 317         }
 318
 319         devm_kfree(dev, mdev);
 320 }
 321
 322 int komeda_dev_resume(struct komeda_dev *mdev)
 323 {
 324         clk_prepare_enable(mdev->aclk);
 325
 326         mdev->funcs->enable_irq(mdev);
 327
 328         if (mdev->iommu && mdev->funcs->connect_iommu)
 329                 if (mdev->funcs->connect_iommu(mdev))
 330                         DRM_ERROR("connect iommu failed.\n");
 331
 332         return 0;
 333 }
 334
 335 int komeda_dev_suspend(struct komeda_dev *mdev)
 336 {
 337         if (mdev->iommu && mdev->funcs->disconnect_iommu)
 338                 if (mdev->funcs->disconnect_iommu(mdev))
 339                         DRM_ERROR("disconnect iommu failed.\n");
 340
 341         mdev->funcs->disable_irq(mdev);
 342
 343         clk_disable_unprepare(mdev->aclk);
 344
 345         return 0;
 346 }