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         ret = 0;
 156
 157         for_each_available_child_of_node(np, child) {
 158                 if (of_node_name_eq(child, "pipeline")) {
 159                         of_property_read_u32(child, "reg", &pipe_id);
 160                         if (pipe_id >= mdev->n_pipelines) {
 161                                 DRM_WARN("Skip the redundant DT node: pipeline-%u.\n",
 162                                          pipe_id);
 163                                 continue;
 164                         }
 165                         mdev->pipelines[pipe_id]->of_node = of_node_get(child);
 166                 }
 167         }
 168
 169         for (pipe_id = 0; pipe_id < mdev->n_pipelines; pipe_id++) {
 170                 pipe = mdev->pipelines[pipe_id];
 171
 172                 if (!pipe->of_node) {
 173                         DRM_ERROR("Pipeline-%d doesn't have a DT node.\n",
 174                                   pipe->id);
 175                         return -EINVAL;
 176                 }
 177                 ret = komeda_parse_pipe_dt(pipe);
 178                 if (ret)
 179                         return ret;
 180         }
 181
 182         return 0;
 183 }
 184
 185 struct komeda_dev *komeda_dev_create(struct device *dev)
 186 {
 187         struct platform_device *pdev = to_platform_device(dev);
 188         komeda_identify_func komeda_identify;
 189         struct komeda_dev *mdev;
 190         int err = 0;
 191
 192         komeda_identify = of_device_get_match_data(dev);
 193         if (!komeda_identify)
 194                 return ERR_PTR(-ENODEV);
 195
 196         mdev = devm_kzalloc(dev, sizeof(*mdev), GFP_KERNEL);
 197         if (!mdev)
 198                 return ERR_PTR(-ENOMEM);
 199
 200         mutex_init(&mdev->lock);
 201
 202         mdev->dev = dev;
 203         mdev->reg_base = devm_platform_ioremap_resource(pdev, 0);
 204         if (IS_ERR(mdev->reg_base)) {
 205                 DRM_ERROR("Map register space failed.\n");
 206                 err = PTR_ERR(mdev->reg_base);
 207                 mdev->reg_base = NULL;
 208                 goto err_cleanup;
 209         }
 210
 211         mdev->aclk = devm_clk_get(dev, "aclk");
 212         if (IS_ERR(mdev->aclk)) {
 213                 DRM_ERROR("Get engine clk failed.\n");
 214                 err = PTR_ERR(mdev->aclk);
 215                 mdev->aclk = NULL;
 216                 goto err_cleanup;
 217         }
 218
 219         clk_prepare_enable(mdev->aclk);
 220
 221         mdev->funcs = komeda_identify(mdev->reg_base, &mdev->chip);
 222         if (!mdev->funcs) {
 223                 DRM_ERROR("Failed to identify the HW.\n");
 224                 err = -ENODEV;
 225                 goto disable_clk;
 226         }
 227
 228         DRM_INFO("Found ARM Mali-D%x version r%dp%d\n",
 229                  MALIDP_CORE_ID_PRODUCT_ID(mdev->chip.core_id),
 230                  MALIDP_CORE_ID_MAJOR(mdev->chip.core_id),
 231                  MALIDP_CORE_ID_MINOR(mdev->chip.core_id));
 232
 233         mdev->funcs->init_format_table(mdev);
 234
 235         err = mdev->funcs->enum_resources(mdev);
 236         if (err) {
 237                 DRM_ERROR("enumerate display resource failed.\n");
 238                 goto disable_clk;
 239         }
 240
 241         err = komeda_parse_dt(dev, mdev);
 242         if (err) {
 243                 DRM_ERROR("parse device tree failed.\n");
 244                 goto disable_clk;
 245         }
 246
 247         err = komeda_assemble_pipelines(mdev);
 248         if (err) {
 249                 DRM_ERROR("assemble display pipelines failed.\n");
 250                 goto disable_clk;
 251         }
 252
 253         dma_set_max_seg_size(dev, U32_MAX);
 254
 255         mdev->iommu = iommu_get_domain_for_dev(mdev->dev);
 256         if (!mdev->iommu)
 257                 DRM_INFO("continue without IOMMU support!\n");
 258
 259         clk_disable_unprepare(mdev->aclk);
 260
 261         err = sysfs_create_group(&dev->kobj, &komeda_sysfs_attr_group);
 262         if (err) {
 263                 DRM_ERROR("create sysfs group failed.\n");
 264                 goto err_cleanup;
 265         }
 266
 267         mdev->err_verbosity = KOMEDA_DEV_PRINT_ERR_EVENTS;
 268
 269 #ifdef CONFIG_DEBUG_FS
 270         komeda_debugfs_init(mdev);
 271 #endif
 272
 273         return mdev;
 274
 275 disable_clk:
 276         clk_disable_unprepare(mdev->aclk);
 277 err_cleanup:
 278         komeda_dev_destroy(mdev);
 279         return ERR_PTR(err);
 280 }
 281
 282 void komeda_dev_destroy(struct komeda_dev *mdev)
 283 {
 284         struct device *dev = mdev->dev;
 285         const struct komeda_dev_funcs *funcs = mdev->funcs;
 286         int i;
 287
 288         sysfs_remove_group(&dev->kobj, &komeda_sysfs_attr_group);
 289
 290 #ifdef CONFIG_DEBUG_FS
 291         debugfs_remove_recursive(mdev->debugfs_root);
 292 #endif
 293
 294         if (mdev->aclk)
 295                 clk_prepare_enable(mdev->aclk);
 296
 297         for (i = 0; i < mdev->n_pipelines; i++) {
 298                 komeda_pipeline_destroy(mdev, mdev->pipelines[i]);
 299                 mdev->pipelines[i] = NULL;
 300         }
 301
 302         mdev->n_pipelines = 0;
 303
 304         of_reserved_mem_device_release(dev);
 305
 306         if (funcs && funcs->cleanup)
 307                 funcs->cleanup(mdev);
 308
 309         if (mdev->reg_base) {
 310                 devm_iounmap(dev, mdev->reg_base);
 311                 mdev->reg_base = NULL;
 312         }
 313
 314         if (mdev->aclk) {
 315                 clk_disable_unprepare(mdev->aclk);
 316                 devm_clk_put(dev, mdev->aclk);
 317                 mdev->aclk = NULL;
 318         }
 319
 320         devm_kfree(dev, mdev);
 321 }
 322
 323 int komeda_dev_resume(struct komeda_dev *mdev)
 324 {
 325         clk_prepare_enable(mdev->aclk);
 326
 327         mdev->funcs->enable_irq(mdev);
 328
 329         if (mdev->iommu && mdev->funcs->connect_iommu)
 330                 if (mdev->funcs->connect_iommu(mdev))
 331                         DRM_ERROR("connect iommu failed.\n");
 332
 333         return 0;
 334 }
 335
 336 int komeda_dev_suspend(struct komeda_dev *mdev)
 337 {
 338         if (mdev->iommu && mdev->funcs->disconnect_iommu)
 339                 if (mdev->funcs->disconnect_iommu(mdev))
 340                         DRM_ERROR("disconnect iommu failed.\n");
 341
 342         mdev->funcs->disable_irq(mdev);
 343
 344         clk_disable_unprepare(mdev->aclk);
 345
 346         return 0;
 347 }