drivers/gpu/drm/armada/armada_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2012 Russell King
   4  */
   5
   6 #include <linux/clk.h>
   7 #include <linux/component.h>
   8 #include <linux/module.h>
   9 #include <linux/of_graph.h>
  10 #include <linux/platform_device.h>
  11
  12 #include <drm/drm_atomic_helper.h>
  13 #include <drm/drm_drv.h>
  14 #include <drm/drm_ioctl.h>
  15 #include <drm/drm_prime.h>
  16 #include <drm/drm_probe_helper.h>
  17 #include <drm/drm_fb_helper.h>
  18 #include <drm/drm_of.h>
  19 #include <drm/drm_vblank.h>
  20
  21 #include "armada_crtc.h"
  22 #include "armada_drm.h"
  23 #include "armada_gem.h"
  24 #include "armada_fb.h"
  25 #include "armada_hw.h"
  26 #include <drm/armada_drm.h>
  27 #include "armada_ioctlP.h"
  28
  29 static struct drm_ioctl_desc armada_ioctls[] = {
  30         DRM_IOCTL_DEF_DRV(ARMADA_GEM_CREATE, armada_gem_create_ioctl,0),
  31         DRM_IOCTL_DEF_DRV(ARMADA_GEM_MMAP, armada_gem_mmap_ioctl, 0),
  32         DRM_IOCTL_DEF_DRV(ARMADA_GEM_PWRITE, armada_gem_pwrite_ioctl, 0),
  33 };
  34
  35 DEFINE_DRM_GEM_FOPS(armada_drm_fops);
  36
  37 static struct drm_driver armada_drm_driver = {
  38         .lastclose              = drm_fb_helper_lastclose,
  39         .gem_free_object_unlocked = armada_gem_free_object,
  40         .prime_handle_to_fd     = drm_gem_prime_handle_to_fd,
  41         .prime_fd_to_handle     = drm_gem_prime_fd_to_handle,
  42         .gem_prime_export       = armada_gem_prime_export,
  43         .gem_prime_import       = armada_gem_prime_import,
  44         .dumb_create            = armada_gem_dumb_create,
  45         .gem_vm_ops             = &armada_gem_vm_ops,
  46         .major                  = 1,
  47         .minor                  = 0,
  48         .name                   = "armada-drm",
  49         .desc                   = "Armada SoC DRM",
  50         .date                   = "20120730",
  51         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
  52         .ioctls                 = armada_ioctls,
  53         .fops                   = &armada_drm_fops,
  54 };
  55
  56 static const struct drm_mode_config_funcs armada_drm_mode_config_funcs = {
  57         .fb_create              = armada_fb_create,
  58         .output_poll_changed    = drm_fb_helper_output_poll_changed,
  59         .atomic_check           = drm_atomic_helper_check,
  60         .atomic_commit          = drm_atomic_helper_commit,
  61 };
  62
  63 static int armada_drm_bind(struct device *dev)
  64 {
  65         struct armada_private *priv;
  66         struct resource *mem = NULL;
  67         int ret, n;
  68
  69         for (n = 0; ; n++) {
  70                 struct resource *r = platform_get_resource(to_platform_device(dev),
  71                                                            IORESOURCE_MEM, n);
  72                 if (!r)
  73                         break;
  74
  75                 /* Resources above 64K are graphics memory */
  76                 if (resource_size(r) > SZ_64K)
  77                         mem = r;
  78                 else
  79                         return -EINVAL;
  80         }
  81
  82         if (!mem)
  83                 return -ENXIO;
  84
  85         if (!devm_request_mem_region(dev, mem->start, resource_size(mem),
  86                                      "armada-drm"))
  87                 return -EBUSY;
  88
  89         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
  90         if (!priv)
  91                 return -ENOMEM;
  92
  93         /*
  94          * The drm_device structure must be at the start of
  95          * armada_private for drm_dev_put() to work correctly.
  96          */
  97         BUILD_BUG_ON(offsetof(struct armada_private, drm) != 0);
  98
  99         ret = drm_dev_init(&priv->drm, &armada_drm_driver, dev);
 100         if (ret) {
 101                 dev_err(dev, "[" DRM_NAME ":%s] drm_dev_init failed: %d\n",
 102                         __func__, ret);
 103                 kfree(priv);
 104                 return ret;
 105         }
 106
 107         /* Remove early framebuffers */
 108         ret = drm_fb_helper_remove_conflicting_framebuffers(NULL,
 109                                                             "armada-drm-fb",
 110                                                             false);
 111         if (ret) {
 112                 dev_err(dev, "[" DRM_NAME ":%s] can't kick out simple-fb: %d\n",
 113                         __func__, ret);
 114                 kfree(priv);
 115                 return ret;
 116         }
 117
 118         priv->drm.dev_private = priv;
 119
 120         dev_set_drvdata(dev, &priv->drm);
 121
 122         /* Mode setting support */
 123         drm_mode_config_init(&priv->drm);
 124         priv->drm.mode_config.min_width = 320;
 125         priv->drm.mode_config.min_height = 200;
 126
 127         /*
 128          * With vscale enabled, the maximum width is 1920 due to the
 129          * 1920 by 3 lines RAM
 130          */
 131         priv->drm.mode_config.max_width = 1920;
 132         priv->drm.mode_config.max_height = 2048;
 133
 134         priv->drm.mode_config.preferred_depth = 24;
 135         priv->drm.mode_config.funcs = &armada_drm_mode_config_funcs;
 136         drm_mm_init(&priv->linear, mem->start, resource_size(mem));
 137         mutex_init(&priv->linear_lock);
 138
 139         ret = component_bind_all(dev, &priv->drm);
 140         if (ret)
 141                 goto err_kms;
 142
 143         ret = drm_vblank_init(&priv->drm, priv->drm.mode_config.num_crtc);
 144         if (ret)
 145                 goto err_comp;
 146
 147         priv->drm.irq_enabled = true;
 148
 149         drm_mode_config_reset(&priv->drm);
 150
 151         ret = armada_fbdev_init(&priv->drm);
 152         if (ret)
 153                 goto err_comp;
 154
 155         drm_kms_helper_poll_init(&priv->drm);
 156
 157         ret = drm_dev_register(&priv->drm, 0);
 158         if (ret)
 159                 goto err_poll;
 160
 161 #ifdef CONFIG_DEBUG_FS
 162         armada_drm_debugfs_init(priv->drm.primary);
 163 #endif
 164
 165         return 0;
 166
 167  err_poll:
 168         drm_kms_helper_poll_fini(&priv->drm);
 169         armada_fbdev_fini(&priv->drm);
 170  err_comp:
 171         component_unbind_all(dev, &priv->drm);
 172  err_kms:
 173         drm_mode_config_cleanup(&priv->drm);
 174         drm_mm_takedown(&priv->linear);
 175         drm_dev_put(&priv->drm);
 176         return ret;
 177 }
 178
 179 static void armada_drm_unbind(struct device *dev)
 180 {
 181         struct drm_device *drm = dev_get_drvdata(dev);
 182         struct armada_private *priv = drm->dev_private;
 183
 184         drm_kms_helper_poll_fini(&priv->drm);
 185         armada_fbdev_fini(&priv->drm);
 186
 187         drm_dev_unregister(&priv->drm);
 188
 189         drm_atomic_helper_shutdown(&priv->drm);
 190
 191         component_unbind_all(dev, &priv->drm);
 192
 193         drm_mode_config_cleanup(&priv->drm);
 194         drm_mm_takedown(&priv->linear);
 195
 196         drm_dev_put(&priv->drm);
 197 }
 198
 199 static int compare_of(struct device *dev, void *data)
 200 {
 201         return dev->of_node == data;
 202 }
 203
 204 static int compare_dev_name(struct device *dev, void *data)
 205 {
 206         const char *name = data;
 207         return !strcmp(dev_name(dev), name);
 208 }
 209
 210 static void armada_add_endpoints(struct device *dev,
 211         struct component_match **match, struct device_node *dev_node)
 212 {
 213         struct device_node *ep, *remote;
 214
 215         for_each_endpoint_of_node(dev_node, ep) {
 216                 remote = of_graph_get_remote_port_parent(ep);
 217                 if (remote && of_device_is_available(remote))
 218                         drm_of_component_match_add(dev, match, compare_of,
 219                                                    remote);
 220                 of_node_put(remote);
 221         }
 222 }
 223
 224 static const struct component_master_ops armada_master_ops = {
 225         .bind = armada_drm_bind,
 226         .unbind = armada_drm_unbind,
 227 };
 228
 229 static int armada_drm_probe(struct platform_device *pdev)
 230 {
 231         struct component_match *match = NULL;
 232         struct device *dev = &pdev->dev;
 233         int ret;
 234
 235         ret = drm_of_component_probe(dev, compare_dev_name, &armada_master_ops);
 236         if (ret != -EINVAL)
 237                 return ret;
 238
 239         if (dev->platform_data) {
 240                 char **devices = dev->platform_data;
 241                 struct device *d;
 242                 int i;
 243
 244                 for (i = 0; devices[i]; i++)
 245                         component_match_add(dev, &match, compare_dev_name,
 246                                             devices[i]);
 247
 248                 if (i == 0) {
 249                         dev_err(dev, "missing 'ports' property\n");
 250                         return -ENODEV;
 251                 }
 252
 253                 for (i = 0; devices[i]; i++) {
 254                         d = bus_find_device_by_name(&platform_bus_type, NULL,
 255                                                     devices[i]);
 256                         if (d && d->of_node)
 257                                 armada_add_endpoints(dev, &match, d->of_node);
 258                         put_device(d);
 259                 }
 260         }
 261
 262         return component_master_add_with_match(&pdev->dev, &armada_master_ops,
 263                                                match);
 264 }
 265
 266 static int armada_drm_remove(struct platform_device *pdev)
 267 {
 268         component_master_del(&pdev->dev, &armada_master_ops);
 269         return 0;
 270 }
 271
 272 static const struct platform_device_id armada_drm_platform_ids[] = {
 273         {
 274                 .name           = "armada-drm",
 275         }, {
 276                 .name           = "armada-510-drm",
 277         },
 278         { },
 279 };
 280 MODULE_DEVICE_TABLE(platform, armada_drm_platform_ids);
 281
 282 static struct platform_driver armada_drm_platform_driver = {
 283         .probe  = armada_drm_probe,
 284         .remove = armada_drm_remove,
 285         .driver = {
 286                 .name   = "armada-drm",
 287         },
 288         .id_table = armada_drm_platform_ids,
 289 };
 290
 291 static int __init armada_drm_init(void)
 292 {
 293         int ret;
 294
 295         armada_drm_driver.num_ioctls = ARRAY_SIZE(armada_ioctls);
 296
 297         ret = platform_driver_register(&armada_lcd_platform_driver);
 298         if (ret)
 299                 return ret;
 300         ret = platform_driver_register(&armada_drm_platform_driver);
 301         if (ret)
 302                 platform_driver_unregister(&armada_lcd_platform_driver);
 303         return ret;
 304 }
 305 module_init(armada_drm_init);
 306
 307 static void __exit armada_drm_exit(void)
 308 {
 309         platform_driver_unregister(&armada_drm_platform_driver);
 310         platform_driver_unregister(&armada_lcd_platform_driver);
 311 }
 312 module_exit(armada_drm_exit);
 313
 314 MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>");
 315 MODULE_DESCRIPTION("Armada DRM Driver");
 316 MODULE_LICENSE("GPL");
 317 MODULE_ALIAS("platform:armada-drm");