drivers/gpu/drm/sti/sti_drv.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) STMicroelectronics SA 2014
   4  * Author: Benjamin Gaignard <[email protected]> for STMicroelectronics.
   5  */
   6
   7 #include <linux/component.h>
   8 #include <linux/debugfs.h>
   9 #include <linux/dma-mapping.h>
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/of.h>
  13 #include <linux/of_platform.h>
  14 #include <linux/platform_device.h>
  15
  16 #include <drm/clients/drm_client_setup.h>
  17 #include <drm/drm_atomic.h>
  18 #include <drm/drm_atomic_helper.h>
  19 #include <drm/drm_debugfs.h>
  20 #include <drm/drm_drv.h>
  21 #include <drm/drm_fbdev_dma.h>
  22 #include <drm/drm_gem_dma_helper.h>
  23 #include <drm/drm_gem_framebuffer_helper.h>
  24 #include <drm/drm_of.h>
  25 #include <drm/drm_probe_helper.h>
  26
  27 #include "sti_drv.h"
  28 #include "sti_plane.h"
  29
  30 #define DRIVER_NAME     "sti"
  31 #define DRIVER_DESC     "STMicroelectronics SoC DRM"
  32 #define DRIVER_MAJOR    1
  33 #define DRIVER_MINOR    0
  34
  35 #define STI_MAX_FB_HEIGHT       4096
  36 #define STI_MAX_FB_WIDTH        4096
  37
  38 static int sti_drm_fps_get(void *data, u64 *val)
  39 {
  40         struct drm_device *drm_dev = data;
  41         struct drm_plane *p;
  42         unsigned int i = 0;
  43
  44         *val = 0;
  45         list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
  46                 struct sti_plane *plane = to_sti_plane(p);
  47
  48                 *val |= plane->fps_info.output << i;
  49                 i++;
  50         }
  51
  52         return 0;
  53 }
  54
  55 static int sti_drm_fps_set(void *data, u64 val)
  56 {
  57         struct drm_device *drm_dev = data;
  58         struct drm_plane *p;
  59         unsigned int i = 0;
  60
  61         list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
  62                 struct sti_plane *plane = to_sti_plane(p);
  63
  64                 memset(&plane->fps_info, 0, sizeof(plane->fps_info));
  65                 plane->fps_info.output = (val >> i) & 1;
  66
  67                 i++;
  68         }
  69
  70         return 0;
  71 }
  72
  73 DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops,
  74                         sti_drm_fps_get, sti_drm_fps_set, "%llu\n");
  75
  76 static int sti_drm_fps_dbg_show(struct seq_file *s, void *data)
  77 {
  78         struct drm_info_node *node = s->private;
  79         struct drm_device *dev = node->minor->dev;
  80         struct drm_plane *p;
  81
  82         list_for_each_entry(p, &dev->mode_config.plane_list, head) {
  83                 struct sti_plane *plane = to_sti_plane(p);
  84
  85                 seq_printf(s, "%s%s\n",
  86                            plane->fps_info.fps_str,
  87                            plane->fps_info.fips_str);
  88         }
  89
  90         return 0;
  91 }
  92
  93 static struct drm_info_list sti_drm_dbg_list[] = {
  94         {"fps_get", sti_drm_fps_dbg_show, 0},
  95 };
  96
  97 static void sti_drm_dbg_init(struct drm_minor *minor)
  98 {
  99         drm_debugfs_create_files(sti_drm_dbg_list,
 100                                  ARRAY_SIZE(sti_drm_dbg_list),
 101                                  minor->debugfs_root, minor);
 102
 103         debugfs_create_file("fps_show", S_IRUGO | S_IWUSR, minor->debugfs_root,
 104                             minor->dev, &sti_drm_fps_fops);
 105
 106         DRM_INFO("%s: debugfs installed\n", DRIVER_NAME);
 107 }
 108
 109 static const struct drm_mode_config_funcs sti_mode_config_funcs = {
 110         .fb_create = drm_gem_fb_create,
 111         .atomic_check = drm_atomic_helper_check,
 112         .atomic_commit = drm_atomic_helper_commit,
 113 };
 114
 115 static void sti_mode_config_init(struct drm_device *dev)
 116 {
 117         dev->mode_config.min_width = 0;
 118         dev->mode_config.min_height = 0;
 119
 120         /*
 121          * set max width and height as default value.
 122          * this value would be used to check framebuffer size limitation
 123          * at drm_mode_addfb().
 124          */
 125         dev->mode_config.max_width = STI_MAX_FB_WIDTH;
 126         dev->mode_config.max_height = STI_MAX_FB_HEIGHT;
 127
 128         dev->mode_config.funcs = &sti_mode_config_funcs;
 129
 130         dev->mode_config.normalize_zpos = true;
 131 }
 132
 133 DEFINE_DRM_GEM_DMA_FOPS(sti_driver_fops);
 134
 135 static const struct drm_driver sti_driver = {
 136         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 137         .fops = &sti_driver_fops,
 138         DRM_GEM_DMA_DRIVER_OPS,
 139         DRM_FBDEV_DMA_DRIVER_OPS,
 140
 141         .debugfs_init = sti_drm_dbg_init,
 142
 143         .name = DRIVER_NAME,
 144         .desc = DRIVER_DESC,
 145         .major = DRIVER_MAJOR,
 146         .minor = DRIVER_MINOR,
 147 };
 148
 149 static int sti_init(struct drm_device *ddev)
 150 {
 151         struct sti_private *private;
 152
 153         private = kzalloc(sizeof(*private), GFP_KERNEL);
 154         if (!private)
 155                 return -ENOMEM;
 156
 157         ddev->dev_private = (void *)private;
 158         dev_set_drvdata(ddev->dev, ddev);
 159         private->drm_dev = ddev;
 160
 161         drm_mode_config_init(ddev);
 162
 163         sti_mode_config_init(ddev);
 164
 165         drm_kms_helper_poll_init(ddev);
 166
 167         return 0;
 168 }
 169
 170 static void sti_cleanup(struct drm_device *ddev)
 171 {
 172         struct sti_private *private = ddev->dev_private;
 173
 174         drm_kms_helper_poll_fini(ddev);
 175         drm_atomic_helper_shutdown(ddev);
 176         drm_mode_config_cleanup(ddev);
 177         component_unbind_all(ddev->dev, ddev);
 178         dev_set_drvdata(ddev->dev, NULL);
 179         kfree(private);
 180         ddev->dev_private = NULL;
 181 }
 182
 183 static int sti_bind(struct device *dev)
 184 {
 185         struct drm_device *ddev;
 186         int ret;
 187
 188         ddev = drm_dev_alloc(&sti_driver, dev);
 189         if (IS_ERR(ddev))
 190                 return PTR_ERR(ddev);
 191
 192         ret = sti_init(ddev);
 193         if (ret)
 194                 goto err_drm_dev_put;
 195
 196         ret = component_bind_all(ddev->dev, ddev);
 197         if (ret)
 198                 goto err_cleanup;
 199
 200         ret = drm_dev_register(ddev, 0);
 201         if (ret)
 202                 goto err_cleanup;
 203
 204         drm_mode_config_reset(ddev);
 205
 206         drm_client_setup(ddev, NULL);
 207
 208         return 0;
 209
 210 err_cleanup:
 211         sti_cleanup(ddev);
 212 err_drm_dev_put:
 213         drm_dev_put(ddev);
 214         return ret;
 215 }
 216
 217 static void sti_unbind(struct device *dev)
 218 {
 219         struct drm_device *ddev = dev_get_drvdata(dev);
 220
 221         drm_dev_unregister(ddev);
 222         sti_cleanup(ddev);
 223         drm_dev_put(ddev);
 224 }
 225
 226 static const struct component_master_ops sti_ops = {
 227         .bind = sti_bind,
 228         .unbind = sti_unbind,
 229 };
 230
 231 static int sti_platform_probe(struct platform_device *pdev)
 232 {
 233         struct device *dev = &pdev->dev;
 234         struct device_node *node = dev->of_node;
 235         struct device_node *child_np;
 236         struct component_match *match = NULL;
 237
 238         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 239
 240         devm_of_platform_populate(dev);
 241
 242         child_np = of_get_next_available_child(node, NULL);
 243
 244         while (child_np) {
 245                 drm_of_component_match_add(dev, &match, component_compare_of,
 246                                            child_np);
 247                 child_np = of_get_next_available_child(node, child_np);
 248         }
 249
 250         return component_master_add_with_match(dev, &sti_ops, match);
 251 }
 252
 253 static void sti_platform_remove(struct platform_device *pdev)
 254 {
 255         component_master_del(&pdev->dev, &sti_ops);
 256 }
 257
 258 static void sti_platform_shutdown(struct platform_device *pdev)
 259 {
 260         drm_atomic_helper_shutdown(platform_get_drvdata(pdev));
 261 }
 262
 263 static const struct of_device_id sti_dt_ids[] = {
 264         { .compatible = "st,sti-display-subsystem", },
 265         { /* end node */ },
 266 };
 267 MODULE_DEVICE_TABLE(of, sti_dt_ids);
 268
 269 static struct platform_driver sti_platform_driver = {
 270         .probe = sti_platform_probe,
 271         .remove = sti_platform_remove,
 272         .shutdown = sti_platform_shutdown,
 273         .driver = {
 274                 .name = DRIVER_NAME,
 275                 .of_match_table = sti_dt_ids,
 276         },
 277 };
 278
 279 static struct platform_driver * const drivers[] = {
 280         &sti_tvout_driver,
 281         &sti_hqvdp_driver,
 282         &sti_hdmi_driver,
 283         &sti_hda_driver,
 284         &sti_dvo_driver,
 285         &sti_vtg_driver,
 286         &sti_compositor_driver,
 287         &sti_platform_driver,
 288 };
 289
 290 static int sti_drm_init(void)
 291 {
 292         if (drm_firmware_drivers_only())
 293                 return -ENODEV;
 294
 295         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 296 }
 297 module_init(sti_drm_init);
 298
 299 static void sti_drm_exit(void)
 300 {
 301         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 302 }
 303 module_exit(sti_drm_exit);
 304
 305 MODULE_AUTHOR("Benjamin Gaignard <[email protected]>");
 306 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
 307 MODULE_LICENSE("GPL");