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