drivers/gpu/drm/arc/arcpgu_drv.c

   1 /*
   2  * ARC PGU DRM driver.
   3  *
   4  * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include <linux/clk.h>
  18 #include <drm/drm_crtc_helper.h>
  19 #include <drm/drm_fb_cma_helper.h>
  20 #include <drm/drm_gem_cma_helper.h>
  21 #include <drm/drm_atomic_helper.h>
  22 #include <linux/of_reserved_mem.h>
  23
  24 #include "arcpgu.h"
  25 #include "arcpgu_regs.h"
  26
  27 static void arcpgu_fb_output_poll_changed(struct drm_device *dev)
  28 {
  29         struct arcpgu_drm_private *arcpgu = dev->dev_private;
  30
  31         if (arcpgu->fbdev)
  32                 drm_fbdev_cma_hotplug_event(arcpgu->fbdev);
  33 }
  34
  35 static int arcpgu_atomic_commit(struct drm_device *dev,
  36                                     struct drm_atomic_state *state, bool async)
  37 {
  38         return drm_atomic_helper_commit(dev, state, false);
  39 }
  40
  41 static struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
  42         .fb_create  = drm_fb_cma_create,
  43         .output_poll_changed = arcpgu_fb_output_poll_changed,
  44         .atomic_check = drm_atomic_helper_check,
  45         .atomic_commit = arcpgu_atomic_commit,
  46 };
  47
  48 static void arcpgu_setup_mode_config(struct drm_device *drm)
  49 {
  50         drm_mode_config_init(drm);
  51         drm->mode_config.min_width = 0;
  52         drm->mode_config.min_height = 0;
  53         drm->mode_config.max_width = 1920;
  54         drm->mode_config.max_height = 1080;
  55         drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
  56 }
  57
  58 int arcpgu_gem_mmap(struct file *filp, struct vm_area_struct *vma)
  59 {
  60         int ret;
  61
  62         ret = drm_gem_mmap(filp, vma);
  63         if (ret)
  64                 return ret;
  65
  66         vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
  67         return 0;
  68 }
  69
  70 static const struct file_operations arcpgu_drm_ops = {
  71         .owner = THIS_MODULE,
  72         .open = drm_open,
  73         .release = drm_release,
  74         .unlocked_ioctl = drm_ioctl,
  75 #ifdef CONFIG_COMPAT
  76         .compat_ioctl = drm_compat_ioctl,
  77 #endif
  78         .poll = drm_poll,
  79         .read = drm_read,
  80         .llseek = no_llseek,
  81         .mmap = arcpgu_gem_mmap,
  82 };
  83
  84 static void arcpgu_preclose(struct drm_device *drm, struct drm_file *file)
  85 {
  86         struct arcpgu_drm_private *arcpgu = drm->dev_private;
  87         struct drm_pending_vblank_event *e, *t;
  88         unsigned long flags;
  89
  90         spin_lock_irqsave(&drm->event_lock, flags);
  91         list_for_each_entry_safe(e, t, &arcpgu->event_list, base.link) {
  92                 if (e->base.file_priv != file)
  93                         continue;
  94                 list_del(&e->base.link);
  95                 e->base.destroy(&e->base);
  96         }
  97         spin_unlock_irqrestore(&drm->event_lock, flags);
  98 }
  99
 100 static void arcpgu_lastclose(struct drm_device *drm)
 101 {
 102         struct arcpgu_drm_private *arcpgu = drm->dev_private;
 103
 104         drm_fbdev_cma_restore_mode(arcpgu->fbdev);
 105 }
 106
 107 static int arcpgu_load(struct drm_device *drm)
 108 {
 109         struct platform_device *pdev = to_platform_device(drm->dev);
 110         struct arcpgu_drm_private *arcpgu;
 111         struct device_node *encoder_node;
 112         struct resource *res;
 113         int ret;
 114
 115         arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
 116         if (arcpgu == NULL)
 117                 return -ENOMEM;
 118
 119         drm->dev_private = arcpgu;
 120
 121         arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
 122         if (IS_ERR(arcpgu->clk))
 123                 return PTR_ERR(arcpgu->clk);
 124
 125         INIT_LIST_HEAD(&arcpgu->event_list);
 126
 127         arcpgu_setup_mode_config(drm);
 128
 129         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 130         arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
 131         if (IS_ERR(arcpgu->regs)) {
 132                 dev_err(drm->dev, "Could not remap IO mem\n");
 133                 return PTR_ERR(arcpgu->regs);
 134         }
 135
 136         dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
 137                  arc_pgu_read(arcpgu, ARCPGU_REG_ID));
 138
 139         /* Get the optional framebuffer memory resource */
 140         ret = of_reserved_mem_device_init(drm->dev);
 141         if (ret && ret != -ENODEV)
 142                 return ret;
 143
 144         if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
 145                 return -ENODEV;
 146
 147         if (arc_pgu_setup_crtc(drm) < 0)
 148                 return -ENODEV;
 149
 150         /* find the encoder node and initialize it */
 151         encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
 152         if (!encoder_node) {
 153                 dev_err(drm->dev, "failed to get an encoder slave node\n");
 154                 return -ENODEV;
 155         }
 156
 157         ret = arcpgu_drm_hdmi_init(drm, encoder_node);
 158         if (ret < 0)
 159                 return ret;
 160
 161         drm_mode_config_reset(drm);
 162         drm_kms_helper_poll_init(drm);
 163
 164         arcpgu->fbdev = drm_fbdev_cma_init(drm, 16,
 165                                               drm->mode_config.num_crtc,
 166                                               drm->mode_config.num_connector);
 167         if (IS_ERR(arcpgu->fbdev)) {
 168                 ret = PTR_ERR(arcpgu->fbdev);
 169                 arcpgu->fbdev = NULL;
 170                 return -ENODEV;
 171         }
 172
 173         platform_set_drvdata(pdev, arcpgu);
 174         return 0;
 175 }
 176
 177 int arcpgu_unload(struct drm_device *drm)
 178 {
 179         struct arcpgu_drm_private *arcpgu = drm->dev_private;
 180
 181         if (arcpgu->fbdev) {
 182                 drm_fbdev_cma_fini(arcpgu->fbdev);
 183                 arcpgu->fbdev = NULL;
 184         }
 185         drm_kms_helper_poll_fini(drm);
 186         drm_vblank_cleanup(drm);
 187         drm_mode_config_cleanup(drm);
 188
 189         return 0;
 190 }
 191
 192 static struct drm_driver arcpgu_drm_driver = {
 193         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
 194                            DRIVER_ATOMIC,
 195         .preclose = arcpgu_preclose,
 196         .lastclose = arcpgu_lastclose,
 197         .name = "drm-arcpgu",
 198         .desc = "ARC PGU Controller",
 199         .date = "20160219",
 200         .major = 1,
 201         .minor = 0,
 202         .patchlevel = 0,
 203         .fops = &arcpgu_drm_ops,
 204         .dumb_create = drm_gem_cma_dumb_create,
 205         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 206         .dumb_destroy = drm_gem_dumb_destroy,
 207         .get_vblank_counter = drm_vblank_no_hw_counter,
 208         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 209         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 210         .gem_free_object = drm_gem_cma_free_object,
 211         .gem_vm_ops = &drm_gem_cma_vm_ops,
 212         .gem_prime_export = drm_gem_prime_export,
 213         .gem_prime_import = drm_gem_prime_import,
 214         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 215         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 216         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 217         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 218         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 219 };
 220
 221 static int arcpgu_probe(struct platform_device *pdev)
 222 {
 223         struct drm_device *drm;
 224         int ret;
 225
 226         drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
 227         if (!drm)
 228                 return -ENOMEM;
 229
 230         ret = arcpgu_load(drm);
 231         if (ret)
 232                 goto err_unref;
 233
 234         ret = drm_dev_register(drm, 0);
 235         if (ret)
 236                 goto err_unload;
 237
 238         ret = drm_connector_register_all(drm);
 239         if (ret)
 240                 goto err_unregister;
 241
 242         return 0;
 243
 244 err_unregister:
 245         drm_dev_unregister(drm);
 246
 247 err_unload:
 248         arcpgu_unload(drm);
 249
 250 err_unref:
 251         drm_dev_unref(drm);
 252
 253         return ret;
 254 }
 255
 256 static int arcpgu_remove(struct platform_device *pdev)
 257 {
 258         struct drm_device *drm = platform_get_drvdata(pdev);
 259
 260         drm_connector_unregister_all(drm);
 261         drm_dev_unregister(drm);
 262         arcpgu_unload(drm);
 263         drm_dev_unref(drm);
 264
 265         return 0;
 266 }
 267
 268 static const struct of_device_id arcpgu_of_table[] = {
 269         {.compatible = "snps,arcpgu"},
 270         {}
 271 };
 272
 273 MODULE_DEVICE_TABLE(of, arcpgu_of_table);
 274
 275 static struct platform_driver arcpgu_platform_driver = {
 276         .probe = arcpgu_probe,
 277         .remove = arcpgu_remove,
 278         .driver = {
 279                    .name = "arcpgu",
 280                    .of_match_table = arcpgu_of_table,
 281                    },
 282 };
 283
 284 module_platform_driver(arcpgu_platform_driver);
 285
 286 MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
 287 MODULE_DESCRIPTION("ARC PGU DRM driver");
 288 MODULE_LICENSE("GPL");