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 sti_init(struct drm_device *ddev)
 148 {
 149         struct sti_private *private;
 150
 151         private = kzalloc(sizeof(*private), GFP_KERNEL);
 152         if (!private)
 153                 return -ENOMEM;
 154
 155         ddev->dev_private = (void *)private;
 156         dev_set_drvdata(ddev->dev, ddev);
 157         private->drm_dev = ddev;
 158
 159         drm_mode_config_init(ddev);
 160
 161         sti_mode_config_init(ddev);
 162
 163         drm_kms_helper_poll_init(ddev);
 164
 165         return 0;
 166 }
 167
 168 static void sti_cleanup(struct drm_device *ddev)
 169 {
 170         struct sti_private *private = ddev->dev_private;
 171
 172         drm_kms_helper_poll_fini(ddev);
 173         drm_atomic_helper_shutdown(ddev);
 174         drm_mode_config_cleanup(ddev);
 175         component_unbind_all(ddev->dev, ddev);
 176         kfree(private);
 177         ddev->dev_private = NULL;
 178 }
 179
 180 static int sti_bind(struct device *dev)
 181 {
 182         struct drm_device *ddev;
 183         int ret;
 184
 185         ddev = drm_dev_alloc(&sti_driver, dev);
 186         if (IS_ERR(ddev))
 187                 return PTR_ERR(ddev);
 188
 189         ret = sti_init(ddev);
 190         if (ret)
 191                 goto err_drm_dev_put;
 192
 193         ret = component_bind_all(ddev->dev, ddev);
 194         if (ret)
 195                 goto err_cleanup;
 196
 197         ret = drm_dev_register(ddev, 0);
 198         if (ret)
 199                 goto err_cleanup;
 200
 201         drm_mode_config_reset(ddev);
 202
 203         drm_fbdev_generic_setup(ddev, 32);
 204
 205         return 0;
 206
 207 err_cleanup:
 208         sti_cleanup(ddev);
 209 err_drm_dev_put:
 210         drm_dev_put(ddev);
 211         return ret;
 212 }
 213
 214 static void sti_unbind(struct device *dev)
 215 {
 216         struct drm_device *ddev = dev_get_drvdata(dev);
 217
 218         drm_dev_unregister(ddev);
 219         sti_cleanup(ddev);
 220         drm_dev_put(ddev);
 221 }
 222
 223 static const struct component_master_ops sti_ops = {
 224         .bind = sti_bind,
 225         .unbind = sti_unbind,
 226 };
 227
 228 static int sti_platform_probe(struct platform_device *pdev)
 229 {
 230         struct device *dev = &pdev->dev;
 231         struct device_node *node = dev->of_node;
 232         struct device_node *child_np;
 233         struct component_match *match = NULL;
 234
 235         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 236
 237         devm_of_platform_populate(dev);
 238
 239         child_np = of_get_next_available_child(node, NULL);
 240
 241         while (child_np) {
 242                 drm_of_component_match_add(dev, &match, component_compare_of,
 243                                            child_np);
 244                 child_np = of_get_next_available_child(node, child_np);
 245         }
 246
 247         return component_master_add_with_match(dev, &sti_ops, match);
 248 }
 249
 250 static int sti_platform_remove(struct platform_device *pdev)
 251 {
 252         component_master_del(&pdev->dev, &sti_ops);
 253
 254         return 0;
 255 }
 256
 257 static const struct of_device_id sti_dt_ids[] = {
 258         { .compatible = "st,sti-display-subsystem", },
 259         { /* end node */ },
 260 };
 261 MODULE_DEVICE_TABLE(of, sti_dt_ids);
 262
 263 static struct platform_driver sti_platform_driver = {
 264         .probe = sti_platform_probe,
 265         .remove = sti_platform_remove,
 266         .driver = {
 267                 .name = DRIVER_NAME,
 268                 .of_match_table = sti_dt_ids,
 269         },
 270 };
 271
 272 static struct platform_driver * const drivers[] = {
 273         &sti_tvout_driver,
 274         &sti_hqvdp_driver,
 275         &sti_hdmi_driver,
 276         &sti_hda_driver,
 277         &sti_dvo_driver,
 278         &sti_vtg_driver,
 279         &sti_compositor_driver,
 280         &sti_platform_driver,
 281 };
 282
 283 static int sti_drm_init(void)
 284 {
 285         if (drm_firmware_drivers_only())
 286                 return -ENODEV;
 287
 288         return platform_register_drivers(drivers, ARRAY_SIZE(drivers));
 289 }
 290 module_init(sti_drm_init);
 291
 292 static void sti_drm_exit(void)
 293 {
 294         platform_unregister_drivers(drivers, ARRAY_SIZE(drivers));
 295 }
 296 module_exit(sti_drm_exit);
 297
 298 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
 299 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
 300 MODULE_LICENSE("GPL");