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/dma-mapping.h>
  14 #ifdef CONFIG_DEBUG_FS
  15 #include <linux/debugfs.h>
  16 #include <linux/seq_file.h>
  17 #endif
  18
  19 #include <drm/drm_print.h>
  20
  21 #include "komeda_dev.h"
  22
  23 static int komeda_register_show(struct seq_file *sf, void *x)
  24 {
  25         struct komeda_dev *mdev = sf->private;
  26         int i;
  27
  28         if (mdev->funcs->dump_register)
  29                 mdev->funcs->dump_register(mdev, sf);
  30
  31         for (i = 0; i < mdev->n_pipelines; i++)
  32                 komeda_pipeline_dump_register(mdev->pipelines[i], sf);
  33
  34         return 0;
  35 }
  36
  37 static int komeda_register_open(struct inode *inode, struct file *filp)
  38 {
  39         return single_open(filp, komeda_register_show, inode->i_private);
  40 }
  41
  42 static const struct file_operations komeda_register_fops = {
  43         .owner          = THIS_MODULE,
  44         .open           = komeda_register_open,
  45         .read           = seq_read,
  46         .llseek         = seq_lseek,
  47         .release        = single_release,
  48 };
  49
  50 #ifdef CONFIG_DEBUG_FS
  51 static void komeda_debugfs_init(struct komeda_dev *mdev)
  52 {
  53         if (!debugfs_initialized())
  54                 return;
  55
  56         mdev->debugfs_root = debugfs_create_dir("komeda", NULL);
  57         debugfs_create_file("register", 0444, mdev->debugfs_root,
  58                             mdev, &komeda_register_fops);
  59 }
  60 #endif
  61
  62 static ssize_t
  63 core_id_show(struct device *dev, struct device_attribute *attr, char *buf)
  64 {
  65         struct komeda_dev *mdev = dev_to_mdev(dev);
  66
  67         return snprintf(buf, PAGE_SIZE, "0x%08x\n", mdev->chip.core_id);
  68 }
  69 static DEVICE_ATTR_RO(core_id);
  70
  71 static ssize_t
  72 config_id_show(struct device *dev, struct device_attribute *attr, char *buf)
  73 {
  74         struct komeda_dev *mdev = dev_to_mdev(dev);
  75         struct komeda_pipeline *pipe = mdev->pipelines[0];
  76         union komeda_config_id config_id;
  77         int i;
  78
  79         memset(&config_id, 0, sizeof(config_id));
  80
  81         config_id.max_line_sz = pipe->layers[0]->hsize_in.end;
  82         config_id.n_pipelines = mdev->n_pipelines;
  83         config_id.n_scalers = pipe->n_scalers;
  84         config_id.n_layers = pipe->n_layers;
  85         config_id.n_richs = 0;
  86         for (i = 0; i < pipe->n_layers; i++) {
  87                 if (pipe->layers[i]->layer_type == KOMEDA_FMT_RICH_LAYER)
  88                         config_id.n_richs++;
  89         }
  90         return snprintf(buf, PAGE_SIZE, "0x%08x\n", config_id.value);
  91 }
  92 static DEVICE_ATTR_RO(config_id);
  93
  94 static struct attribute *komeda_sysfs_entries[] = {
  95         &dev_attr_core_id.attr,
  96         &dev_attr_config_id.attr,
  97         NULL,
  98 };
  99
 100 static struct attribute_group komeda_sysfs_attr_group = {
 101         .attrs = komeda_sysfs_entries,
 102 };
 103
 104 static int komeda_parse_pipe_dt(struct komeda_dev *mdev, struct device_node *np)
 105 {
 106         struct komeda_pipeline *pipe;
 107         struct clk *clk;
 108         u32 pipe_id;
 109         int ret = 0;
 110
 111         ret = of_property_read_u32(np, "reg", &pipe_id);
 112         if (ret != 0 || pipe_id >= mdev->n_pipelines)
 113                 return -EINVAL;
 114
 115         pipe = mdev->pipelines[pipe_id];
 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_dev =
 126                 of_graph_get_remote_node(np, KOMEDA_OF_PORT_OUTPUT, 0);
 127         pipe->of_output_port =
 128                 of_graph_get_port_by_id(np, KOMEDA_OF_PORT_OUTPUT);
 129
 130         pipe->of_node = np;
 131
 132         return 0;
 133 }
 134
 135 static int komeda_parse_dt(struct device *dev, struct komeda_dev *mdev)
 136 {
 137         struct platform_device *pdev = to_platform_device(dev);
 138         struct device_node *child, *np = dev->of_node;
 139         int ret;
 140
 141         mdev->irq  = platform_get_irq(pdev, 0);
 142         if (mdev->irq < 0) {
 143                 DRM_ERROR("could not get IRQ number.\n");
 144                 return mdev->irq;
 145         }
 146
 147         /* Get the optional framebuffer memory resource */
 148         ret = of_reserved_mem_device_init(dev);
 149         if (ret && ret != -ENODEV)
 150                 return ret;
 151         ret = 0;
 152
 153         for_each_available_child_of_node(np, child) {
 154                 if (of_node_cmp(child->name, "pipeline") == 0) {
 155                         ret = komeda_parse_pipe_dt(mdev, child);
 156                         if (ret) {
 157                                 DRM_ERROR("parse pipeline dt error!\n");
 158                                 of_node_put(child);
 159                                 break;
 160                         }
 161                 }
 162         }
 163
 164         return ret;
 165 }
 166
 167 struct komeda_dev *komeda_dev_create(struct device *dev)
 168 {
 169         struct platform_device *pdev = to_platform_device(dev);
 170         const struct komeda_product_data *product;
 171         struct komeda_dev *mdev;
 172         struct resource *io_res;
 173         int err = 0;
 174
 175         product = of_device_get_match_data(dev);
 176         if (!product)
 177                 return ERR_PTR(-ENODEV);
 178
 179         io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 180         if (!io_res) {
 181                 DRM_ERROR("No registers defined.\n");
 182                 return ERR_PTR(-ENODEV);
 183         }
 184
 185         mdev = devm_kzalloc(dev, sizeof(*mdev), GFP_KERNEL);
 186         if (!mdev)
 187                 return ERR_PTR(-ENOMEM);
 188
 189         mutex_init(&mdev->lock);
 190
 191         mdev->dev = dev;
 192         mdev->reg_base = devm_ioremap_resource(dev, io_res);
 193         if (IS_ERR(mdev->reg_base)) {
 194                 DRM_ERROR("Map register space failed.\n");
 195                 err = PTR_ERR(mdev->reg_base);
 196                 mdev->reg_base = NULL;
 197                 goto err_cleanup;
 198         }
 199
 200         mdev->aclk = devm_clk_get(dev, "aclk");
 201         if (IS_ERR(mdev->aclk)) {
 202                 DRM_ERROR("Get engine clk failed.\n");
 203                 err = PTR_ERR(mdev->aclk);
 204                 mdev->aclk = NULL;
 205                 goto err_cleanup;
 206         }
 207
 208         clk_prepare_enable(mdev->aclk);
 209
 210         mdev->funcs = product->identify(mdev->reg_base, &mdev->chip);
 211         if (!komeda_product_match(mdev, product->product_id)) {
 212                 DRM_ERROR("DT configured %x mismatch with real HW %x.\n",
 213                           product->product_id,
 214                           MALIDP_CORE_ID_PRODUCT_ID(mdev->chip.core_id));
 215                 err = -ENODEV;
 216                 goto err_cleanup;
 217         }
 218
 219         DRM_INFO("Found ARM Mali-D%x version r%dp%d\n",
 220                  MALIDP_CORE_ID_PRODUCT_ID(mdev->chip.core_id),
 221                  MALIDP_CORE_ID_MAJOR(mdev->chip.core_id),
 222                  MALIDP_CORE_ID_MINOR(mdev->chip.core_id));
 223
 224         mdev->funcs->init_format_table(mdev);
 225
 226         err = mdev->funcs->enum_resources(mdev);
 227         if (err) {
 228                 DRM_ERROR("enumerate display resource failed.\n");
 229                 goto err_cleanup;
 230         }
 231
 232         err = komeda_parse_dt(dev, mdev);
 233         if (err) {
 234                 DRM_ERROR("parse device tree failed.\n");
 235                 goto err_cleanup;
 236         }
 237
 238         err = komeda_assemble_pipelines(mdev);
 239         if (err) {
 240                 DRM_ERROR("assemble display pipelines failed.\n");
 241                 goto err_cleanup;
 242         }
 243
 244         dev->dma_parms = &mdev->dma_parms;
 245         dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
 246
 247         mdev->iommu = iommu_get_domain_for_dev(mdev->dev);
 248         if (!mdev->iommu)
 249                 DRM_INFO("continue without IOMMU support!\n");
 250
 251         if (mdev->iommu && mdev->funcs->connect_iommu) {
 252                 err = mdev->funcs->connect_iommu(mdev);
 253                 if (err) {
 254                         mdev->iommu = NULL;
 255                         goto err_cleanup;
 256                 }
 257         }
 258
 259         err = sysfs_create_group(&dev->kobj, &komeda_sysfs_attr_group);
 260         if (err) {
 261                 DRM_ERROR("create sysfs group failed.\n");
 262                 goto err_cleanup;
 263         }
 264
 265 #ifdef CONFIG_DEBUG_FS
 266         komeda_debugfs_init(mdev);
 267 #endif
 268
 269         return mdev;
 270
 271 err_cleanup:
 272         komeda_dev_destroy(mdev);
 273         return ERR_PTR(err);
 274 }
 275
 276 void komeda_dev_destroy(struct komeda_dev *mdev)
 277 {
 278         struct device *dev = mdev->dev;
 279         const struct komeda_dev_funcs *funcs = mdev->funcs;
 280         int i;
 281
 282         sysfs_remove_group(&dev->kobj, &komeda_sysfs_attr_group);
 283
 284 #ifdef CONFIG_DEBUG_FS
 285         debugfs_remove_recursive(mdev->debugfs_root);
 286 #endif
 287
 288         if (mdev->iommu && mdev->funcs->disconnect_iommu)
 289                 mdev->funcs->disconnect_iommu(mdev);
 290         mdev->iommu = NULL;
 291
 292         for (i = 0; i < mdev->n_pipelines; i++) {
 293                 komeda_pipeline_destroy(mdev, mdev->pipelines[i]);
 294                 mdev->pipelines[i] = NULL;
 295         }
 296
 297         mdev->n_pipelines = 0;
 298
 299         of_reserved_mem_device_release(dev);
 300
 301         if (funcs && funcs->cleanup)
 302                 funcs->cleanup(mdev);
 303
 304         if (mdev->reg_base) {
 305                 devm_iounmap(dev, mdev->reg_base);
 306                 mdev->reg_base = NULL;
 307         }
 308
 309         if (mdev->aclk) {
 310                 clk_disable_unprepare(mdev->aclk);
 311                 devm_clk_put(dev, mdev->aclk);
 312                 mdev->aclk = NULL;
 313         }
 314
 315         devm_kfree(dev, mdev);
 316 }