drivers/gpu/drm/armada/armada_drv.c

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