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/dma-mapping.h>
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/of_platform.h>
  12
  13 #include <drm/drm_atomic.h>
  14 #include <drm/drm_atomic_helper.h>
  15 #include <drm/drm_debugfs.h>
  16 #include <drm/drm_drv.h>
  17 #include <drm/drm_fbdev_dma.h>
  18 #include <drm/drm_gem_dma_helper.h>
  19 #include <drm/drm_gem_framebuffer_helper.h>
  20 #include <drm/drm_of.h>
  21 #include <drm/drm_probe_helper.h>
  22
  23 #include "sti_drv.h"
  24 #include "sti_plane.h"
  25
  26 #define DRIVER_NAME     "sti"
  27 #define DRIVER_DESC     "STMicroelectronics SoC DRM"
  28 #define DRIVER_DATE     "20140601"
  29 #define DRIVER_MAJOR    1
  30 #define DRIVER_MINOR    0
  31
  32 #define STI_MAX_FB_HEIGHT       4096
  33 #define STI_MAX_FB_WIDTH        4096
  34
  35 static int sti_drm_fps_get(void *data, u64 *val)
  36 {
  37         struct drm_device *drm_dev = data;
  38         struct drm_plane *p;
  39         unsigned int i = 0;
  40
  41         *val = 0;
  42         list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
  43                 struct sti_plane *plane = to_sti_plane(p);
  44
  45                 *val |= plane->fps_info.output << i;
  46                 i++;
  47         }
  48
  49         return 0;
  50 }
  51
  52 static int sti_drm_fps_set(void *data, u64 val)
  53 {
  54         struct drm_device *drm_dev = data;
  55         struct drm_plane *p;
  56         unsigned int i = 0;
  57
  58         list_for_each_entry(p, &drm_dev->mode_config.plane_list, head) {
  59                 struct sti_plane *plane = to_sti_plane(p);
  60
  61                 memset(&plane->fps_info, 0, sizeof(plane->fps_info));
  62                 plane->fps_info.output = (val >> i) & 1;
  63
  64                 i++;
  65         }
  66
  67         return 0;
  68 }
  69
  70 DEFINE_SIMPLE_ATTRIBUTE(sti_drm_fps_fops,
  71                         sti_drm_fps_get, sti_drm_fps_set, "%llu\n");
  72
  73 static int sti_drm_fps_dbg_show(struct seq_file *s, void *data)
  74 {
  75         struct drm_info_node *node = s->private;
  76         struct drm_device *dev = node->minor->dev;
  77         struct drm_plane *p;
  78
  79         list_for_each_entry(p, &dev->mode_config.plane_list, head) {
  80                 struct sti_plane *plane = to_sti_plane(p);
  81
  82                 seq_printf(s, "%s%s\n",
  83                            plane->fps_info.fps_str,
  84                            plane->fps_info.fips_str);
  85         }
  86
  87         return 0;
  88 }
  89
  90 static struct drm_info_list sti_drm_dbg_list[] = {
  91         {"fps_get", sti_drm_fps_dbg_show, 0},
  92 };
  93
  94 static void sti_drm_dbg_init(struct drm_minor *minor)
  95 {
  96         drm_debugfs_create_files(sti_drm_dbg_list,
  97                                  ARRAY_SIZE(sti_drm_dbg_list),
  98                                  minor->debugfs_root, minor);
  99
 100         debugfs_create_file("fps_show", S_IRUGO | S_IWUSR, minor->debugfs_root,
 101                             minor->dev, &sti_drm_fps_fops);
 102
 103         DRM_INFO("%s: debugfs installed\n", DRIVER_NAME);
 104 }
 105
 106 static const struct drm_mode_config_funcs sti_mode_config_funcs = {
 107         .fb_create = drm_gem_fb_create,
 108         .atomic_check = drm_atomic_helper_check,
 109         .atomic_commit = drm_atomic_helper_commit,
 110 };
 111
 112 static void sti_mode_config_init(struct drm_device *dev)
 113 {
 114         dev->mode_config.min_width = 0;
 115         dev->mode_config.min_height = 0;
 116
 117         /*
 118          * set max width and height as default value.
 119          * this value would be used to check framebuffer size limitation
 120          * at drm_mode_addfb().
 121          */
 122         dev->mode_config.max_width = STI_MAX_FB_WIDTH;
 123         dev->mode_config.max_height = STI_MAX_FB_HEIGHT;
 124
 125         dev->mode_config.funcs = &sti_mode_config_funcs;
 126
 127         dev->mode_config.normalize_zpos = true;
 128 }
 129
 130 DEFINE_DRM_GEM_DMA_FOPS(sti_driver_fops);
 131
 132 static const struct drm_driver sti_driver = {
 133         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 134         .fops = &sti_driver_fops,
 135         DRM_GEM_DMA_DRIVER_OPS,
 136
 137         .debugfs_init = sti_drm_dbg_init,
 138
 139         .name = DRIVER_NAME,
 140         .desc = DRIVER_DESC,
 141         .date = DRIVER_DATE,
 142         .major = DRIVER_MAJOR,
 143         .minor = DRIVER_MINOR,
 144 };
 145
 146 static int sti_init(struct drm_device *ddev)
 147 {
 148         struct sti_private *private;
 149
 150         private = kzalloc(sizeof(*private), GFP_KERNEL);
 151         if (!private)
 152                 return -ENOMEM;
 153
 154         ddev->dev_private = (void *)private;
 155         dev_set_drvdata(ddev->dev, ddev);
 156         private->drm_dev = ddev;
 157
 158         drm_mode_config_init(ddev);
 159
 160         sti_mode_config_init(ddev);
 161
 162         drm_kms_helper_poll_init(ddev);
 163
 164         return 0;
 165 }
 166
 167 static void sti_cleanup(struct drm_device *ddev)
 168 {
 169         struct sti_private *private = ddev->dev_private;
 170
 171         drm_kms_helper_poll_fini(ddev);
 172         drm_atomic_helper_shutdown(ddev);
 173         drm_mode_config_cleanup(ddev);
 174         component_unbind_all(ddev->dev, ddev);
 175         kfree(private);
 176         ddev->dev_private = NULL;
 177 }
 178
 179 static int sti_bind(struct device *dev)
 180 {
 181         struct drm_device *ddev;
 182         int ret;
 183
 184         ddev = drm_dev_alloc(&sti_driver, dev);
 185         if (IS_ERR(ddev))
 186                 return PTR_ERR(ddev);
 187
 188         ret = sti_init(ddev);
 189         if (ret)
 190                 goto err_drm_dev_put;
 191
 192         ret = component_bind_all(ddev->dev, ddev);
 193         if (ret)
 194                 goto err_cleanup;
 195
 196         ret = drm_dev_register(ddev, 0);
 197         if (ret)
 198                 goto err_cleanup;
 199
 200         drm_mode_config_reset(ddev);
 201
 202         drm_fbdev_dma_setup(ddev, 32);
 203
 204         return 0;
 205
 206 err_cleanup:
 207         sti_cleanup(ddev);
 208 err_drm_dev_put:
 209         drm_dev_put(ddev);
 210         return ret;
 211 }
 212
 213 static void sti_unbind(struct device *dev)
 214 {
 215         struct drm_device *ddev = dev_get_drvdata(dev);
 216
 217         drm_dev_unregister(ddev);
 218         sti_cleanup(ddev);
 219         drm_dev_put(ddev);
 220 }
 221
 222 static const struct component_master_ops sti_ops = {
 223         .bind = sti_bind,
 224         .unbind = sti_unbind,
 225 };
 226
 227 static int sti_platform_probe(struct platform_device *pdev)
 228 {
 229         struct device *dev = &pdev->dev;
 230         struct device_node *node = dev->of_node;
 231         struct device_node *child_np;
 232         struct component_match *match = NULL;
 233
 234         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 235
 236         devm_of_platform_populate(dev);
 237
 238         child_np = of_get_next_available_child(node, NULL);
 239
 240         while (child_np) {
 241                 drm_of_component_match_add(dev, &match, component_compare_of,
 242                                            child_np);
 243                 child_np = of_get_next_available_child(node, child_np);
 244         }
 245
 246         return component_master_add_with_match(dev, &sti_ops, match);
 247 }
 248
 249 static int sti_platform_remove(struct platform_device *pdev)
 250 {
 251         component_master_del(&pdev->dev, &sti_ops);
 252
 253         return 0;
 254 }
 255
 256 static const struct of_device_id sti_dt_ids[] = {
 257         { .compatible = "st,sti-display-subsystem", },
 258         { /* end node */ },
 259 };
 260 MODULE_DEVICE_TABLE(of, sti_dt_ids);
 261
 262 static struct platform_driver sti_platform_driver = {
 263         .probe = sti_platform_probe,
 264         .remove = sti_platform_remove,
 265         .driver = {
 266                 .name = DRIVER_NAME,
 267                 .of_match_table = sti_dt_ids,
 268         },
 269 };
 270
 271 static struct platform_driver * const drivers[] = {
 272         &sti_tvout_driver,
 273         &sti_hqvdp_driver,
 274         &sti_hdmi_driver,
 275         &sti_hda_driver,
 276         &sti_dvo_driver,
 277         &sti_vtg_driver,
 278         &sti_compositor_driver,
 279         &sti_platform_driver,
 280 };
 281
 282 static int sti_drm_init(void)
 283 {
 284         if (drm_firmware_drivers_only())
 285                 return -ENODEV;
 286
 287         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 288 }
 289 module_init(sti_drm_init);
 290
 291 static void sti_drm_exit(void)
 292 {
 293         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 294 }
 295 module_exit(sti_drm_exit);
 296
 297 MODULE_AUTHOR("Benjamin Gaignard <[email protected]>");
 298 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
 299 MODULE_LICENSE("GPL");