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         drm_fbdev_cma_hotplug_event(arcpgu->fbdev);
  32 }
  33
  34 static struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
  35         .fb_create  = drm_fb_cma_create,
  36         .output_poll_changed = arcpgu_fb_output_poll_changed,
  37         .atomic_check = drm_atomic_helper_check,
  38         .atomic_commit = drm_atomic_helper_commit,
  39 };
  40
  41 static void arcpgu_setup_mode_config(struct drm_device *drm)
  42 {
  43         drm_mode_config_init(drm);
  44         drm->mode_config.min_width = 0;
  45         drm->mode_config.min_height = 0;
  46         drm->mode_config.max_width = 1920;
  47         drm->mode_config.max_height = 1080;
  48         drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
  49 }
  50
  51 static int arcpgu_gem_mmap(struct file *filp, struct vm_area_struct *vma)
  52 {
  53         int ret;
  54
  55         ret = drm_gem_mmap(filp, vma);
  56         if (ret)
  57                 return ret;
  58
  59         vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
  60         return 0;
  61 }
  62
  63 static const struct file_operations arcpgu_drm_ops = {
  64         .owner = THIS_MODULE,
  65         .open = drm_open,
  66         .release = drm_release,
  67         .unlocked_ioctl = drm_ioctl,
  68 #ifdef CONFIG_COMPAT
  69         .compat_ioctl = drm_compat_ioctl,
  70 #endif
  71         .poll = drm_poll,
  72         .read = drm_read,
  73         .llseek = no_llseek,
  74         .mmap = arcpgu_gem_mmap,
  75 };
  76
  77 static void arcpgu_lastclose(struct drm_device *drm)
  78 {
  79         struct arcpgu_drm_private *arcpgu = drm->dev_private;
  80
  81         drm_fbdev_cma_restore_mode(arcpgu->fbdev);
  82 }
  83
  84 static int arcpgu_load(struct drm_device *drm)
  85 {
  86         struct platform_device *pdev = to_platform_device(drm->dev);
  87         struct arcpgu_drm_private *arcpgu;
  88         struct device_node *encoder_node;
  89         struct resource *res;
  90         int ret;
  91
  92         arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
  93         if (arcpgu == NULL)
  94                 return -ENOMEM;
  95
  96         drm->dev_private = arcpgu;
  97
  98         arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
  99         if (IS_ERR(arcpgu->clk))
 100                 return PTR_ERR(arcpgu->clk);
 101
 102         arcpgu_setup_mode_config(drm);
 103
 104         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 105         arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
 106         if (IS_ERR(arcpgu->regs))
 107                 return PTR_ERR(arcpgu->regs);
 108
 109         dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
 110                  arc_pgu_read(arcpgu, ARCPGU_REG_ID));
 111
 112         /* Get the optional framebuffer memory resource */
 113         ret = of_reserved_mem_device_init(drm->dev);
 114         if (ret && ret != -ENODEV)
 115                 return ret;
 116
 117         if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
 118                 return -ENODEV;
 119
 120         if (arc_pgu_setup_crtc(drm) < 0)
 121                 return -ENODEV;
 122
 123         /* find the encoder node and initialize it */
 124         encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
 125         if (encoder_node) {
 126                 ret = arcpgu_drm_hdmi_init(drm, encoder_node);
 127                 of_node_put(encoder_node);
 128                 if (ret < 0)
 129                         return ret;
 130         } else {
 131                 ret = arcpgu_drm_sim_init(drm, NULL);
 132                 if (ret < 0)
 133                         return ret;
 134         }
 135
 136         drm_mode_config_reset(drm);
 137         drm_kms_helper_poll_init(drm);
 138
 139         arcpgu->fbdev = drm_fbdev_cma_init(drm, 16,
 140                                               drm->mode_config.num_crtc,
 141                                               drm->mode_config.num_connector);
 142         if (IS_ERR(arcpgu->fbdev)) {
 143                 ret = PTR_ERR(arcpgu->fbdev);
 144                 arcpgu->fbdev = NULL;
 145                 return -ENODEV;
 146         }
 147
 148         platform_set_drvdata(pdev, arcpgu);
 149         return 0;
 150 }
 151
 152 static int arcpgu_unload(struct drm_device *drm)
 153 {
 154         struct arcpgu_drm_private *arcpgu = drm->dev_private;
 155
 156         if (arcpgu->fbdev) {
 157                 drm_fbdev_cma_fini(arcpgu->fbdev);
 158                 arcpgu->fbdev = NULL;
 159         }
 160         drm_kms_helper_poll_fini(drm);
 161         drm_vblank_cleanup(drm);
 162         drm_mode_config_cleanup(drm);
 163
 164         return 0;
 165 }
 166
 167 static struct drm_driver arcpgu_drm_driver = {
 168         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
 169                            DRIVER_ATOMIC,
 170         .lastclose = arcpgu_lastclose,
 171         .name = "drm-arcpgu",
 172         .desc = "ARC PGU Controller",
 173         .date = "20160219",
 174         .major = 1,
 175         .minor = 0,
 176         .patchlevel = 0,
 177         .fops = &arcpgu_drm_ops,
 178         .dumb_create = drm_gem_cma_dumb_create,
 179         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 180         .dumb_destroy = drm_gem_dumb_destroy,
 181         .get_vblank_counter = drm_vblank_no_hw_counter,
 182         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 183         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 184         .gem_free_object_unlocked = drm_gem_cma_free_object,
 185         .gem_vm_ops = &drm_gem_cma_vm_ops,
 186         .gem_prime_export = drm_gem_prime_export,
 187         .gem_prime_import = drm_gem_prime_import,
 188         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 189         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 190         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 191         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 192         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 193 };
 194
 195 static int arcpgu_probe(struct platform_device *pdev)
 196 {
 197         struct drm_device *drm;
 198         int ret;
 199
 200         drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
 201         if (!drm)
 202                 return -ENOMEM;
 203
 204         ret = arcpgu_load(drm);
 205         if (ret)
 206                 goto err_unref;
 207
 208         ret = drm_dev_register(drm, 0);
 209         if (ret)
 210                 goto err_unload;
 211
 212         return 0;
 213
 214 err_unload:
 215         arcpgu_unload(drm);
 216
 217 err_unref:
 218         drm_dev_unref(drm);
 219
 220         return ret;
 221 }
 222
 223 static int arcpgu_remove(struct platform_device *pdev)
 224 {
 225         struct drm_device *drm = platform_get_drvdata(pdev);
 226
 227         drm_dev_unregister(drm);
 228         arcpgu_unload(drm);
 229         drm_dev_unref(drm);
 230
 231         return 0;
 232 }
 233
 234 static const struct of_device_id arcpgu_of_table[] = {
 235         {.compatible = "snps,arcpgu"},
 236         {}
 237 };
 238
 239 MODULE_DEVICE_TABLE(of, arcpgu_of_table);
 240
 241 static struct platform_driver arcpgu_platform_driver = {
 242         .probe = arcpgu_probe,
 243         .remove = arcpgu_remove,
 244         .driver = {
 245                    .name = "arcpgu",
 246                    .of_match_table = arcpgu_of_table,
 247                    },
 248 };
 249
 250 module_platform_driver(arcpgu_platform_driver);
 251
 252 MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
 253 MODULE_DESCRIPTION("ARC PGU DRM driver");
 254 MODULE_LICENSE("GPL");