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 static int komeda_register_open(struct inode *inode, struct file *filp)
  45 {
  46         return single_open(filp, komeda_register_show, inode->i_private);
  47 }
  48
  49 static const struct file_operations komeda_register_fops = {
  50         .owner          = THIS_MODULE,
  51         .open           = komeda_register_open,
  52         .read           = seq_read,
  53         .llseek         = seq_lseek,
  54         .release        = single_release,
  55 };
  56
  57 #ifdef CONFIG_DEBUG_FS
  58 static void komeda_debugfs_init(struct komeda_dev *mdev)
  59 {
  60         if (!debugfs_initialized())
  61                 return;
  62
  63         mdev->debugfs_root = debugfs_create_dir("komeda", NULL);
  64         debugfs_create_file("register", 0444, mdev->debugfs_root,
  65                             mdev, &komeda_register_fops);
  66         debugfs_create_x16("err_verbosity", 0664, mdev->debugfs_root,
  67                            &mdev->err_verbosity);
  68 }
  69 #endif
  70
  71 static ssize_t
  72 core_id_show(struct device *dev, struct device_attribute *attr, char *buf)
  73 {
  74         struct komeda_dev *mdev = dev_to_mdev(dev);
  75
  76         return snprintf(buf, PAGE_SIZE, "0x%08x\n", mdev->chip.core_id);
  77 }
  78 static DEVICE_ATTR_RO(core_id);
  79
  80 static ssize_t
  81 config_id_show(struct device *dev, struct device_attribute *attr, char *buf)
  82 {
  83         struct komeda_dev *mdev = dev_to_mdev(dev);
  84         struct komeda_pipeline *pipe = mdev->pipelines[0];
  85         union komeda_config_id config_id;
  86         int i;
  87
  88         memset(&config_id, 0, sizeof(config_id));
  89
  90         config_id.max_line_sz = pipe->layers[0]->hsize_in.end;
  91         config_id.n_pipelines = mdev->n_pipelines;
  92         config_id.n_scalers = pipe->n_scalers;
  93         config_id.n_layers = pipe->n_layers;
  94         config_id.n_richs = 0;
  95         for (i = 0; i < pipe->n_layers; i++) {
  96                 if (pipe->layers[i]->layer_type == KOMEDA_FMT_RICH_LAYER)
  97                         config_id.n_richs++;
  98         }
  99         return snprintf(buf, PAGE_SIZE, "0x%08x\n", config_id.value);
 100 }
 101 static DEVICE_ATTR_RO(config_id);
 102
 103 static ssize_t
 104 aclk_hz_show(struct device *dev, struct device_attribute *attr, char *buf)
 105 {
 106         struct komeda_dev *mdev = dev_to_mdev(dev);
 107
 108         return snprintf(buf, PAGE_SIZE, "%lu\n", clk_get_rate(mdev->aclk));
 109 }
 110 static DEVICE_ATTR_RO(aclk_hz);
 111
 112 static struct attribute *komeda_sysfs_entries[] = {
 113         &dev_attr_core_id.attr,
 114         &dev_attr_config_id.attr,
 115         &dev_attr_aclk_hz.attr,
 116         NULL,
 117 };
 118
 119 static struct attribute_group komeda_sysfs_attr_group = {
 120         .attrs = komeda_sysfs_entries,
 121 };
 122
 123 static int komeda_parse_pipe_dt(struct komeda_pipeline *pipe)
 124 {
 125         struct device_node *np = pipe->of_node;
 126         struct clk *clk;
 127
 128         clk = of_clk_get_by_name(np, "pxclk");
 129         if (IS_ERR(clk)) {
 130                 DRM_ERROR("get pxclk for pipeline %d failed!\n", pipe->id);
 131                 return PTR_ERR(clk);
 132         }
 133         pipe->pxlclk = clk;
 134
 135         /* enum ports */
 136         pipe->of_output_links[0] =
 137                 of_graph_get_remote_node(np, KOMEDA_OF_PORT_OUTPUT, 0);
 138         pipe->of_output_links[1] =
 139                 of_graph_get_remote_node(np, KOMEDA_OF_PORT_OUTPUT, 1);
 140         pipe->of_output_port =
 141                 of_graph_get_port_by_id(np, KOMEDA_OF_PORT_OUTPUT);
 142
 143         pipe->dual_link = pipe->of_output_links[0] && pipe->of_output_links[1];
 144
 145         return 0;
 146 }
 147
 148 static int komeda_parse_dt(struct device *dev, struct komeda_dev *mdev)
 149 {
 150         struct platform_device *pdev = to_platform_device(dev);
 151         struct device_node *child, *np = dev->of_node;
 152         struct komeda_pipeline *pipe;
 153         u32 pipe_id = U32_MAX;
 154         int ret = -1;
 155
 156         mdev->irq  = platform_get_irq(pdev, 0);
 157         if (mdev->irq < 0) {
 158                 DRM_ERROR("could not get IRQ number.\n");
 159                 return mdev->irq;
 160         }
 161
 162         /* Get the optional framebuffer memory resource */
 163         ret = of_reserved_mem_device_init(dev);
 164         if (ret && ret != -ENODEV)
 165                 return ret;
 166         ret = 0;
 167
 168         for_each_available_child_of_node(np, child) {
 169                 if (of_node_name_eq(child, "pipeline")) {
 170                         of_property_read_u32(child, "reg", &pipe_id);
 171                         if (pipe_id >= mdev->n_pipelines) {
 172                                 DRM_WARN("Skip the redundant DT node: pipeline-%u.\n",
 173                                          pipe_id);
 174                                 continue;
 175                         }
 176                         mdev->pipelines[pipe_id]->of_node = of_node_get(child);
 177                 }
 178         }
 179
 180         for (pipe_id = 0; pipe_id < mdev->n_pipelines; pipe_id++) {
 181                 pipe = mdev->pipelines[pipe_id];
 182
 183                 if (!pipe->of_node) {
 184                         DRM_ERROR("Pipeline-%d doesn't have a DT node.\n",
 185                                   pipe->id);
 186                         return -EINVAL;
 187                 }
 188                 ret = komeda_parse_pipe_dt(pipe);
 189                 if (ret)
 190                         return ret;
 191         }
 192
 193         return 0;
 194 }
 195
 196 struct komeda_dev *komeda_dev_create(struct device *dev)
 197 {
 198         struct platform_device *pdev = to_platform_device(dev);
 199         komeda_identify_func komeda_identify;
 200         struct komeda_dev *mdev;
 201         int err = 0;
 202
 203         komeda_identify = of_device_get_match_data(dev);
 204         if (!komeda_identify)
 205                 return ERR_PTR(-ENODEV);
 206
 207         mdev = devm_kzalloc(dev, sizeof(*mdev), GFP_KERNEL);
 208         if (!mdev)
 209                 return ERR_PTR(-ENOMEM);
 210
 211         mutex_init(&mdev->lock);
 212
 213         mdev->dev = dev;
 214         mdev->reg_base = devm_platform_ioremap_resource(pdev, 0);
 215         if (IS_ERR(mdev->reg_base)) {
 216                 DRM_ERROR("Map register space failed.\n");
 217                 err = PTR_ERR(mdev->reg_base);
 218                 mdev->reg_base = NULL;
 219                 goto err_cleanup;
 220         }
 221
 222         mdev->aclk = devm_clk_get(dev, "aclk");
 223         if (IS_ERR(mdev->aclk)) {
 224                 DRM_ERROR("Get engine clk failed.\n");
 225                 err = PTR_ERR(mdev->aclk);
 226                 mdev->aclk = NULL;
 227                 goto err_cleanup;
 228         }
 229
 230         clk_prepare_enable(mdev->aclk);
 231
 232         mdev->funcs = komeda_identify(mdev->reg_base, &mdev->chip);
 233         if (!mdev->funcs) {
 234                 DRM_ERROR("Failed to identify the HW.\n");
 235                 err = -ENODEV;
 236                 goto disable_clk;
 237         }
 238
 239         DRM_INFO("Found ARM Mali-D%x version r%dp%d\n",
 240                  MALIDP_CORE_ID_PRODUCT_ID(mdev->chip.core_id),
 241                  MALIDP_CORE_ID_MAJOR(mdev->chip.core_id),
 242                  MALIDP_CORE_ID_MINOR(mdev->chip.core_id));
 243
 244         mdev->funcs->init_format_table(mdev);
 245
 246         err = mdev->funcs->enum_resources(mdev);
 247         if (err) {
 248                 DRM_ERROR("enumerate display resource failed.\n");
 249                 goto disable_clk;
 250         }
 251
 252         err = komeda_parse_dt(dev, mdev);
 253         if (err) {
 254                 DRM_ERROR("parse device tree failed.\n");
 255                 goto disable_clk;
 256         }
 257
 258         err = komeda_assemble_pipelines(mdev);
 259         if (err) {
 260                 DRM_ERROR("assemble display pipelines failed.\n");
 261                 goto disable_clk;
 262         }
 263
 264         dev->dma_parms = &mdev->dma_parms;
 265         dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
 266
 267         mdev->iommu = iommu_get_domain_for_dev(mdev->dev);
 268         if (!mdev->iommu)
 269                 DRM_INFO("continue without IOMMU support!\n");
 270
 271         clk_disable_unprepare(mdev->aclk);
 272
 273         err = sysfs_create_group(&dev->kobj, &komeda_sysfs_attr_group);
 274         if (err) {
 275                 DRM_ERROR("create sysfs group failed.\n");
 276                 goto err_cleanup;
 277         }
 278
 279         mdev->err_verbosity = KOMEDA_DEV_PRINT_ERR_EVENTS;
 280
 281 #ifdef CONFIG_DEBUG_FS
 282         komeda_debugfs_init(mdev);
 283 #endif
 284
 285         return mdev;
 286
 287 disable_clk:
 288         clk_disable_unprepare(mdev->aclk);
 289 err_cleanup:
 290         komeda_dev_destroy(mdev);
 291         return ERR_PTR(err);
 292 }
 293
 294 void komeda_dev_destroy(struct komeda_dev *mdev)
 295 {
 296         struct device *dev = mdev->dev;
 297         const struct komeda_dev_funcs *funcs = mdev->funcs;
 298         int i;
 299
 300         sysfs_remove_group(&dev->kobj, &komeda_sysfs_attr_group);
 301
 302 #ifdef CONFIG_DEBUG_FS
 303         debugfs_remove_recursive(mdev->debugfs_root);
 304 #endif
 305
 306         if (mdev->aclk)
 307                 clk_prepare_enable(mdev->aclk);
 308
 309         for (i = 0; i < mdev->n_pipelines; i++) {
 310                 komeda_pipeline_destroy(mdev, mdev->pipelines[i]);
 311                 mdev->pipelines[i] = NULL;
 312         }
 313
 314         mdev->n_pipelines = 0;
 315
 316         of_reserved_mem_device_release(dev);
 317
 318         if (funcs && funcs->cleanup)
 319                 funcs->cleanup(mdev);
 320
 321         if (mdev->reg_base) {
 322                 devm_iounmap(dev, mdev->reg_base);
 323                 mdev->reg_base = NULL;
 324         }
 325
 326         if (mdev->aclk) {
 327                 clk_disable_unprepare(mdev->aclk);
 328                 devm_clk_put(dev, mdev->aclk);
 329                 mdev->aclk = NULL;
 330         }
 331
 332         devm_kfree(dev, mdev);
 333 }
 334
 335 int komeda_dev_resume(struct komeda_dev *mdev)
 336 {
 337         clk_prepare_enable(mdev->aclk);
 338
 339         mdev->funcs->enable_irq(mdev);
 340
 341         if (mdev->iommu && mdev->funcs->connect_iommu)
 342                 if (mdev->funcs->connect_iommu(mdev))
 343                         DRM_ERROR("connect iommu failed.\n");
 344
 345         return 0;
 346 }
 347
 348 int komeda_dev_suspend(struct komeda_dev *mdev)
 349 {
 350         if (mdev->iommu && mdev->funcs->disconnect_iommu)
 351                 if (mdev->funcs->disconnect_iommu(mdev))
 352                         DRM_ERROR("disconnect iommu failed.\n");
 353
 354         mdev->funcs->disable_irq(mdev);
 355
 356         clk_disable_unprepare(mdev->aclk);
 357
 358         return 0;
 359 }