drivers/gpu/drm/armada/armada_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Russell King
   4  */
   5 #include <linux/clk.h>
   6 #include <linux/component.h>
   7 #include <linux/module.h>
   8 #include <linux/of_graph.h>
   9 #include <drm/drm_atomic_helper.h>
  10 #include <drm/drm_probe_helper.h>
  11 #include <drm/drm_fb_helper.h>
  12 #include <drm/drm_of.h>
  13 #include "armada_crtc.h"
  14 #include "armada_drm.h"
  15 #include "armada_gem.h"
  16 #include "armada_fb.h"
  17 #include "armada_hw.h"
  18 #include <drm/armada_drm.h>
  19 #include "armada_ioctlP.h"
  20
  21 static struct drm_ioctl_desc armada_ioctls[] = {
  22         DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,0),
  23         DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl, 0),
  24         DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl, 0),
  25 };
  26
  27 DEFINE_DRM_GEM_FOPS(armada_drm_fops);
  28
  29 static struct drm_driver armada_drm_driver = {
  30         .lastclose              = drm_fb_helper_lastclose,
  31         .gem_free_object_unlocked = armada_gem_free_object,
  32         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
  33         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
  34         .gem_prime_export       = armada_gem_prime_export,
  35         .gem_prime_import       = armada_gem_prime_import,
  36         .dumb_create            = armada_gem_dumb_create,
  37         .gem_vm_ops             = &armada_gem_vm_ops,
  38         .major                  = 1,
  39         .minor                  = 0,
  40         .name                   = "armada-drm",
  41         .desc                   = "Armada SoC DRM",
  42         .date                   = "20120730",
  43         .driver_features        = DRIVER_GEM | DRIVER_MODESET |
  44                                   DRIVER_PRIME | DRIVER_ATOMIC,
  45         .ioctls                 = armada_ioctls,
  46         .fops                   = &armada_drm_fops,
  47 };
  48
  49 static const struct drm_mode_config_funcs armada_drm_mode_config_funcs = {
  50         .fb_create              = armada_fb_create,
  51         .output_poll_changed    = drm_fb_helper_output_poll_changed,
  52         .atomic_check           = drm_atomic_helper_check,
  53         .atomic_commit          = drm_atomic_helper_commit,
  54 };
  55
  56 static int armada_drm_bind(struct device *dev)
  57 {
  58         struct armada_private *priv;
  59         struct resource *mem = NULL;
  60         int ret, n;
  61
  62         for (n = 0; ; n++) {
  63                 struct resource *r = platform_get_resource(to_platform_device(dev),
  64                                                            IORESOURCE_MEM, n);
  65                 if (!r)
  66                         break;
  67
  68                 /* Resources above 64K are graphics memory */
  69                 if (resource_size(r) > SZ_64K)
  70                         mem = r;
  71                 else
  72                         return -EINVAL;
  73         }
  74
  75         if (!mem)
  76                 return -ENXIO;
  77
  78         if (!devm_request_mem_region(dev, mem->start, resource_size(mem),
  79                                      "armada-drm"))
  80                 return -EBUSY;
  81
  82         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  83         if (!priv)
  84                 return -ENOMEM;
  85
  86         /*
  87          * The drm_device structure must be at the start of
  88          * armada_private for drm_dev_put() to work correctly.
  89          */
  90         BUILD_BUG_ON(offsetof(struct armada_private, drm) != 0);
  91
  92         ret = drm_dev_init(&priv->drm, &armada_drm_driver, dev);
  93         if (ret) {
  94                 dev_err(dev, "[" DRM_NAME ":%s] drm_dev_init failed: %d\n",
  95                         __func__, ret);
  96                 kfree(priv);
  97                 return ret;
  98         }
  99
 100         priv->drm.dev_private = priv;
 101
 102         dev_set_drvdata(dev, &priv->drm);
 103
 104         /* Mode setting support */
 105         drm_mode_config_init(&priv->drm);
 106         priv->drm.mode_config.min_width = 320;
 107         priv->drm.mode_config.min_height = 200;
 108
 109         /*
 110          * With vscale enabled, the maximum width is 1920 due to the
 111          * 1920 by 3 lines RAM
 112          */
 113         priv->drm.mode_config.max_width = 1920;
 114         priv->drm.mode_config.max_height = 2048;
 115
 116         priv->drm.mode_config.preferred_depth = 24;
 117         priv->drm.mode_config.funcs = &armada_drm_mode_config_funcs;
 118         drm_mm_init(&priv->linear, mem->start, resource_size(mem));
 119         mutex_init(&priv->linear_lock);
 120
 121         ret = component_bind_all(dev, &priv->drm);
 122         if (ret)
 123                 goto err_kms;
 124
 125         ret = drm_vblank_init(&priv->drm, priv->drm.mode_config.num_crtc);
 126         if (ret)
 127                 goto err_comp;
 128
 129         priv->drm.irq_enabled = true;
 130
 131         drm_mode_config_reset(&priv->drm);
 132
 133         ret = armada_fbdev_init(&priv->drm);
 134         if (ret)
 135                 goto err_comp;
 136
 137         drm_kms_helper_poll_init(&priv->drm);
 138
 139         ret = drm_dev_register(&priv->drm, 0);
 140         if (ret)
 141                 goto err_poll;
 142
 143 #ifdef CONFIG_DEBUG_FS
 144         armada_drm_debugfs_init(priv->drm.primary);
 145 #endif
 146
 147         return 0;
 148
 149  err_poll:
 150         drm_kms_helper_poll_fini(&priv->drm);
 151         armada_fbdev_fini(&priv->drm);
 152  err_comp:
 153         component_unbind_all(dev, &priv->drm);
 154  err_kms:
 155         drm_mode_config_cleanup(&priv->drm);
 156         drm_mm_takedown(&priv->linear);
 157         drm_dev_put(&priv->drm);
 158         return ret;
 159 }
 160
 161 static void armada_drm_unbind(struct device *dev)
 162 {
 163         struct drm_device *drm = dev_get_drvdata(dev);
 164         struct armada_private *priv = drm->dev_private;
 165
 166         drm_kms_helper_poll_fini(&priv->drm);
 167         armada_fbdev_fini(&priv->drm);
 168
 169         drm_dev_unregister(&priv->drm);
 170
 171         component_unbind_all(dev, &priv->drm);
 172
 173         drm_mode_config_cleanup(&priv->drm);
 174         drm_mm_takedown(&priv->linear);
 175
 176         drm_dev_put(&priv->drm);
 177 }
 178
 179 static int compare_of(struct device *dev, void *data)
 180 {
 181         return dev->of_node == data;
 182 }
 183
 184 static int compare_dev_name(struct device *dev, void *data)
 185 {
 186         const char *name = data;
 187         return !strcmp(dev_name(dev), name);
 188 }
 189
 190 static void armada_add_endpoints(struct device *dev,
 191         struct component_match **match, struct device_node *port)
 192 {
 193         struct device_node *ep, *remote;
 194
 195         for_each_child_of_node(port, ep) {
 196                 remote = of_graph_get_remote_port_parent(ep);
 197                 if (!remote || !of_device_is_available(remote)) {
 198                         of_node_put(remote);
 199                         continue;
 200                 } else if (!of_device_is_available(remote->parent)) {
 201                         dev_warn(dev, "parent device of %pOF is not available\n",
 202                                  remote);
 203                         of_node_put(remote);
 204                         continue;
 205                 }
 206
 207                 drm_of_component_match_add(dev, match, compare_of, remote);
 208                 of_node_put(remote);
 209         }
 210 }
 211
 212 static const struct component_master_ops armada_master_ops = {
 213         .bind = armada_drm_bind,
 214         .unbind = armada_drm_unbind,
 215 };
 216
 217 static int armada_drm_probe(struct platform_device *pdev)
 218 {
 219         struct component_match *match = NULL;
 220         struct device *dev = &pdev->dev;
 221         int ret;
 222
 223         ret = drm_of_component_probe(dev, compare_dev_name, &armada_master_ops);
 224         if (ret != -EINVAL)
 225                 return ret;
 226
 227         if (dev->platform_data) {
 228                 char **devices = dev->platform_data;
 229                 struct device_node *port;
 230                 struct device *d;
 231                 int i;
 232
 233                 for (i = 0; devices[i]; i++)
 234                         component_match_add(dev, &match, compare_dev_name,
 235                                             devices[i]);
 236
 237                 if (i == 0) {
 238                         dev_err(dev, "missing 'ports' property\n");
 239                         return -ENODEV;
 240                 }
 241
 242                 for (i = 0; devices[i]; i++) {
 243                         d = bus_find_device_by_name(&platform_bus_type, NULL,
 244                                                     devices[i]);
 245                         if (d && d->of_node) {
 246                                 for_each_child_of_node(d->of_node, port)
 247                                         armada_add_endpoints(dev, &match, port);
 248                         }
 249                         put_device(d);
 250                 }
 251         }
 252
 253         return component_master_add_with_match(&pdev->dev, &armada_master_ops,
 254                                                match);
 255 }
 256
 257 static int armada_drm_remove(struct platform_device *pdev)
 258 {
 259         component_master_del(&pdev->dev, &armada_master_ops);
 260         return 0;
 261 }
 262
 263 static const struct platform_device_id armada_drm_platform_ids[] = {
 264         {
 265                 .name           = "armada-drm",
 266         }, {
 267                 .name           = "armada-510-drm",
 268         },
 269         { },
 270 };
 271 MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
 272
 273 static struct platform_driver armada_drm_platform_driver = {
 274         .probe  = armada_drm_probe,
 275         .remove = armada_drm_remove,
 276         .driver = {
 277                 .name   = "armada-drm",
 278         },
 279         .id_table = armada_drm_platform_ids,
 280 };
 281
 282 static int __init armada_drm_init(void)
 283 {
 284         int ret;
 285
 286         armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls);
 287
 288         ret = platform_driver_register(&armada_lcd_platform_driver);
 289         if (ret)
 290                 return ret;
 291         ret = platform_driver_register(&armada_drm_platform_driver);
 292         if (ret)
 293                 platform_driver_unregister(&armada_lcd_platform_driver);
 294         return ret;
 295 }
 296 module_init(armada_drm_init);
 297
 298 static void __exit armada_drm_exit(void)
 299 {
 300         platform_driver_unregister(&armada_drm_platform_driver);
 301         platform_driver_unregister(&armada_lcd_platform_driver);
 302 }
 303 module_exit(armada_drm_exit);
 304
 305 MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
 306 MODULE_DESCRIPTION("Armada DRM Driver");
 307 MODULE_LICENSE("GPL");
 308 MODULE_ALIAS("platform:armada-drm");