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/platform_device.h>
  12 #include <linux/dma-mapping.h>
  13 #ifdef CONFIG_DEBUG_FS
  14 #include <linux/debugfs.h>
  15 #include <linux/seq_file.h>
  16 #endif
  17
  18 #include <drm/drm_print.h>
  19
  20 #include "komeda_dev.h"
  21
  22 static int komeda_register_show(struct seq_file *sf, void *x)
  23 {
  24         struct komeda_dev *mdev = sf->private;
  25         int i;
  26
  27         if (mdev->funcs->dump_register)
  28                 mdev->funcs->dump_register(mdev, sf);
  29
  30         for (i = 0; i < mdev->n_pipelines; i++)
  31                 komeda_pipeline_dump_register(mdev->pipelines[i], sf);
  32
  33         return 0;
  34 }
  35
  36 static int komeda_register_open(struct inode *inode, struct file *filp)
  37 {
  38         return single_open(filp, komeda_register_show, inode->i_private);
  39 }
  40
  41 static const struct file_operations komeda_register_fops = {
  42         .owner          = THIS_MODULE,
  43         .open           = komeda_register_open,
  44         .read           = seq_read,
  45         .llseek         = seq_lseek,
  46         .release        = single_release,
  47 };
  48
  49 #ifdef CONFIG_DEBUG_FS
  50 static void komeda_debugfs_init(struct komeda_dev *mdev)
  51 {
  52         if (!debugfs_initialized())
  53                 return;
  54
  55         mdev->debugfs_root = debugfs_create_dir("komeda", NULL);
  56         debugfs_create_file("register", 0444, mdev->debugfs_root,
  57                             mdev, &komeda_register_fops);
  58 }
  59 #endif
  60
  61 static ssize_t
  62 core_id_show(struct device *dev, struct device_attribute *attr, char *buf)
  63 {
  64         struct komeda_dev *mdev = dev_to_mdev(dev);
  65
  66         return snprintf(buf, PAGE_SIZE, "0x%08x\n", mdev->chip.core_id);
  67 }
  68 static DEVICE_ATTR_RO(core_id);
  69
  70 static ssize_t
  71 config_id_show(struct device *dev, struct device_attribute *attr, char *buf)
  72 {
  73         struct komeda_dev *mdev = dev_to_mdev(dev);
  74         struct komeda_pipeline *pipe = mdev->pipelines[0];
  75         union komeda_config_id config_id;
  76         int i;
  77
  78         memset(&config_id, 0, sizeof(config_id));
  79
  80         config_id.max_line_sz = pipe->layers[0]->hsize_in.end;
  81         config_id.n_pipelines = mdev->n_pipelines;
  82         config_id.n_scalers = pipe->n_scalers;
  83         config_id.n_layers = pipe->n_layers;
  84         config_id.n_richs = 0;
  85         for (i = 0; i < pipe->n_layers; i++) {
  86                 if (pipe->layers[i]->layer_type == KOMEDA_FMT_RICH_LAYER)
  87                         config_id.n_richs++;
  88         }
  89         return snprintf(buf, PAGE_SIZE, "0x%08x\n", config_id.value);
  90 }
  91 static DEVICE_ATTR_RO(config_id);
  92
  93 static struct attribute *komeda_sysfs_entries[] = {
  94         &dev_attr_core_id.attr,
  95         &dev_attr_config_id.attr,
  96         NULL,
  97 };
  98
  99 static struct attribute_group komeda_sysfs_attr_group = {
 100         .attrs = komeda_sysfs_entries,
 101 };
 102
 103 static int komeda_parse_pipe_dt(struct komeda_dev *mdev, struct device_node *np)
 104 {
 105         struct komeda_pipeline *pipe;
 106         struct clk *clk;
 107         u32 pipe_id;
 108         int ret = 0;
 109
 110         ret = of_property_read_u32(np, "reg", &pipe_id);
 111         if (ret != 0 || pipe_id >= mdev->n_pipelines)
 112                 return -EINVAL;
 113
 114         pipe = mdev->pipelines[pipe_id];
 115
 116         clk = of_clk_get_by_name(np, "pxclk");
 117         if (IS_ERR(clk)) {
 118                 DRM_ERROR("get pxclk for pipeline %d failed!\n", pipe_id);
 119                 return PTR_ERR(clk);
 120         }
 121         pipe->pxlclk = clk;
 122
 123         /* enum ports */
 124         pipe->of_output_dev =
 125                 of_graph_get_remote_node(np, KOMEDA_OF_PORT_OUTPUT, 0);
 126         pipe->of_output_port =
 127                 of_graph_get_port_by_id(np, KOMEDA_OF_PORT_OUTPUT);
 128
 129         pipe->of_node = np;
 130
 131         return 0;
 132 }
 133
 134 static int komeda_parse_dt(struct device *dev, struct komeda_dev *mdev)
 135 {
 136         struct platform_device *pdev = to_platform_device(dev);
 137         struct device_node *child, *np = dev->of_node;
 138         int ret;
 139
 140         mdev->irq  = platform_get_irq(pdev, 0);
 141         if (mdev->irq < 0) {
 142                 DRM_ERROR("could not get IRQ number.\n");
 143                 return mdev->irq;
 144         }
 145
 146         for_each_available_child_of_node(np, child) {
 147                 if (of_node_cmp(child->name, "pipeline") == 0) {
 148                         ret = komeda_parse_pipe_dt(mdev, child);
 149                         if (ret) {
 150                                 DRM_ERROR("parse pipeline dt error!\n");
 151                                 of_node_put(child);
 152                                 break;
 153                         }
 154                 }
 155         }
 156
 157         return ret;
 158 }
 159
 160 struct komeda_dev *komeda_dev_create(struct device *dev)
 161 {
 162         struct platform_device *pdev = to_platform_device(dev);
 163         const struct komeda_product_data *product;
 164         struct komeda_dev *mdev;
 165         struct resource *io_res;
 166         int err = 0;
 167
 168         product = of_device_get_match_data(dev);
 169         if (!product)
 170                 return ERR_PTR(-ENODEV);
 171
 172         io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 173         if (!io_res) {
 174                 DRM_ERROR("No registers defined.\n");
 175                 return ERR_PTR(-ENODEV);
 176         }
 177
 178         mdev = devm_kzalloc(dev, sizeof(*mdev), GFP_KERNEL);
 179         if (!mdev)
 180                 return ERR_PTR(-ENOMEM);
 181
 182         mutex_init(&mdev->lock);
 183
 184         mdev->dev = dev;
 185         mdev->reg_base = devm_ioremap_resource(dev, io_res);
 186         if (IS_ERR(mdev->reg_base)) {
 187                 DRM_ERROR("Map register space failed.\n");
 188                 err = PTR_ERR(mdev->reg_base);
 189                 mdev->reg_base = NULL;
 190                 goto err_cleanup;
 191         }
 192
 193         mdev->aclk = devm_clk_get(dev, "aclk");
 194         if (IS_ERR(mdev->aclk)) {
 195                 DRM_ERROR("Get engine clk failed.\n");
 196                 err = PTR_ERR(mdev->aclk);
 197                 mdev->aclk = NULL;
 198                 goto err_cleanup;
 199         }
 200
 201         clk_prepare_enable(mdev->aclk);
 202
 203         mdev->funcs = product->identify(mdev->reg_base, &mdev->chip);
 204         if (!komeda_product_match(mdev, product->product_id)) {
 205                 DRM_ERROR("DT configured %x mismatch with real HW %x.\n",
 206                           product->product_id,
 207                           MALIDP_CORE_ID_PRODUCT_ID(mdev->chip.core_id));
 208                 err = -ENODEV;
 209                 goto err_cleanup;
 210         }
 211
 212         DRM_INFO("Found ARM Mali-D%x version r%dp%d\n",
 213                  MALIDP_CORE_ID_PRODUCT_ID(mdev->chip.core_id),
 214                  MALIDP_CORE_ID_MAJOR(mdev->chip.core_id),
 215                  MALIDP_CORE_ID_MINOR(mdev->chip.core_id));
 216
 217         mdev->funcs->init_format_table(mdev);
 218
 219         err = mdev->funcs->enum_resources(mdev);
 220         if (err) {
 221                 DRM_ERROR("enumerate display resource failed.\n");
 222                 goto err_cleanup;
 223         }
 224
 225         err = komeda_parse_dt(dev, mdev);
 226         if (err) {
 227                 DRM_ERROR("parse device tree failed.\n");
 228                 goto err_cleanup;
 229         }
 230
 231         err = komeda_assemble_pipelines(mdev);
 232         if (err) {
 233                 DRM_ERROR("assemble display pipelines failed.\n");
 234                 goto err_cleanup;
 235         }
 236
 237         dev->dma_parms = &mdev->dma_parms;
 238         dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
 239
 240         mdev->iommu = iommu_get_domain_for_dev(mdev->dev);
 241         if (!mdev->iommu)
 242                 DRM_INFO("continue without IOMMU support!\n");
 243
 244         if (mdev->iommu && mdev->funcs->connect_iommu) {
 245                 err = mdev->funcs->connect_iommu(mdev);
 246                 if (err) {
 247                         mdev->iommu = NULL;
 248                         goto err_cleanup;
 249                 }
 250         }
 251
 252         err = sysfs_create_group(&dev->kobj, &komeda_sysfs_attr_group);
 253         if (err) {
 254                 DRM_ERROR("create sysfs group failed.\n");
 255                 goto err_cleanup;
 256         }
 257
 258 #ifdef CONFIG_DEBUG_FS
 259         komeda_debugfs_init(mdev);
 260 #endif
 261
 262         return mdev;
 263
 264 err_cleanup:
 265         komeda_dev_destroy(mdev);
 266         return ERR_PTR(err);
 267 }
 268
 269 void komeda_dev_destroy(struct komeda_dev *mdev)
 270 {
 271         struct device *dev = mdev->dev;
 272         const struct komeda_dev_funcs *funcs = mdev->funcs;
 273         int i;
 274
 275         sysfs_remove_group(&dev->kobj, &komeda_sysfs_attr_group);
 276
 277 #ifdef CONFIG_DEBUG_FS
 278         debugfs_remove_recursive(mdev->debugfs_root);
 279 #endif
 280
 281         if (mdev->iommu && mdev->funcs->disconnect_iommu)
 282                 mdev->funcs->disconnect_iommu(mdev);
 283         mdev->iommu = NULL;
 284
 285         for (i = 0; i < mdev->n_pipelines; i++) {
 286                 komeda_pipeline_destroy(mdev, mdev->pipelines[i]);
 287                 mdev->pipelines[i] = NULL;
 288         }
 289
 290         mdev->n_pipelines = 0;
 291
 292         if (funcs && funcs->cleanup)
 293                 funcs->cleanup(mdev);
 294
 295         if (mdev->reg_base) {
 296                 devm_iounmap(dev, mdev->reg_base);
 297                 mdev->reg_base = NULL;
 298         }
 299
 300         if (mdev->aclk) {
 301                 clk_disable_unprepare(mdev->aclk);
 302                 devm_clk_put(dev, mdev->aclk);
 303                 mdev->aclk = NULL;
 304         }
 305
 306         devm_kfree(dev, mdev);
 307 }