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 struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
  36         .fb_create  = drm_fb_cma_create,
  37         .output_poll_changed = arcpgu_fb_output_poll_changed,
  38         .atomic_check = drm_atomic_helper_check,
  39         .atomic_commit = drm_atomic_helper_commit,
  40 };
  41
  42 static void arcpgu_setup_mode_config(struct drm_device *drm)
  43 {
  44         drm_mode_config_init(drm);
  45         drm->mode_config.min_width = 0;
  46         drm->mode_config.min_height = 0;
  47         drm->mode_config.max_width = 1920;
  48         drm->mode_config.max_height = 1080;
  49         drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
  50 }
  51
  52 int arcpgu_gem_mmap(struct file *filp, struct vm_area_struct *vma)
  53 {
  54         int ret;
  55
  56         ret = drm_gem_mmap(filp, vma);
  57         if (ret)
  58                 return ret;
  59
  60         vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
  61         return 0;
  62 }
  63
  64 static const struct file_operations arcpgu_drm_ops = {
  65         .owner = THIS_MODULE,
  66         .open = drm_open,
  67         .release = drm_release,
  68         .unlocked_ioctl = drm_ioctl,
  69 #ifdef CONFIG_COMPAT
  70         .compat_ioctl = drm_compat_ioctl,
  71 #endif
  72         .poll = drm_poll,
  73         .read = drm_read,
  74         .llseek = no_llseek,
  75         .mmap = arcpgu_gem_mmap,
  76 };
  77
  78 static void arcpgu_lastclose(struct drm_device *drm)
  79 {
  80         struct arcpgu_drm_private *arcpgu = drm->dev_private;
  81
  82         drm_fbdev_cma_restore_mode(arcpgu->fbdev);
  83 }
  84
  85 static int arcpgu_load(struct drm_device *drm)
  86 {
  87         struct platform_device *pdev = to_platform_device(drm->dev);
  88         struct arcpgu_drm_private *arcpgu;
  89         struct device_node *encoder_node;
  90         struct resource *res;
  91         int ret;
  92
  93         arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
  94         if (arcpgu == NULL)
  95                 return -ENOMEM;
  96
  97         drm->dev_private = arcpgu;
  98
  99         arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
 100         if (IS_ERR(arcpgu->clk))
 101                 return PTR_ERR(arcpgu->clk);
 102
 103         arcpgu_setup_mode_config(drm);
 104
 105         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 106         arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
 107         if (IS_ERR(arcpgu->regs)) {
 108                 dev_err(drm->dev, "Could not remap IO mem\n");
 109                 return PTR_ERR(arcpgu->regs);
 110         }
 111
 112         dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
 113                  arc_pgu_read(arcpgu, ARCPGU_REG_ID));
 114
 115         /* Get the optional framebuffer memory resource */
 116         ret = of_reserved_mem_device_init(drm->dev);
 117         if (ret && ret != -ENODEV)
 118                 return ret;
 119
 120         if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
 121                 return -ENODEV;
 122
 123         if (arc_pgu_setup_crtc(drm) < 0)
 124                 return -ENODEV;
 125
 126         /* find the encoder node and initialize it */
 127         encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
 128         if (encoder_node) {
 129                 ret = arcpgu_drm_hdmi_init(drm, encoder_node);
 130                 of_node_put(encoder_node);
 131                 if (ret < 0)
 132                         return ret;
 133         } else {
 134                 ret = arcpgu_drm_sim_init(drm, 0);
 135                 if (ret < 0)
 136                         return ret;
 137         }
 138
 139         drm_mode_config_reset(drm);
 140         drm_kms_helper_poll_init(drm);
 141
 142         arcpgu->fbdev = drm_fbdev_cma_init(drm, 16,
 143                                               drm->mode_config.num_crtc,
 144                                               drm->mode_config.num_connector);
 145         if (IS_ERR(arcpgu->fbdev)) {
 146                 ret = PTR_ERR(arcpgu->fbdev);
 147                 arcpgu->fbdev = NULL;
 148                 return -ENODEV;
 149         }
 150
 151         platform_set_drvdata(pdev, arcpgu);
 152         return 0;
 153 }
 154
 155 int arcpgu_unload(struct drm_device *drm)
 156 {
 157         struct arcpgu_drm_private *arcpgu = drm->dev_private;
 158
 159         if (arcpgu->fbdev) {
 160                 drm_fbdev_cma_fini(arcpgu->fbdev);
 161                 arcpgu->fbdev = NULL;
 162         }
 163         drm_kms_helper_poll_fini(drm);
 164         drm_vblank_cleanup(drm);
 165         drm_mode_config_cleanup(drm);
 166
 167         return 0;
 168 }
 169
 170 static struct drm_driver arcpgu_drm_driver = {
 171         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
 172                            DRIVER_ATOMIC,
 173         .lastclose = arcpgu_lastclose,
 174         .name = "drm-arcpgu",
 175         .desc = "ARC PGU Controller",
 176         .date = "20160219",
 177         .major = 1,
 178         .minor = 0,
 179         .patchlevel = 0,
 180         .fops = &arcpgu_drm_ops,
 181         .dumb_create = drm_gem_cma_dumb_create,
 182         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 183         .dumb_destroy = drm_gem_dumb_destroy,
 184         .get_vblank_counter = drm_vblank_no_hw_counter,
 185         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 186         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 187         .gem_free_object_unlocked = drm_gem_cma_free_object,
 188         .gem_vm_ops = &drm_gem_cma_vm_ops,
 189         .gem_prime_export = drm_gem_prime_export,
 190         .gem_prime_import = drm_gem_prime_import,
 191         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 192         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 193         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 194         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 195         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 196 };
 197
 198 static int arcpgu_probe(struct platform_device *pdev)
 199 {
 200         struct drm_device *drm;
 201         int ret;
 202
 203         drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
 204         if (!drm)
 205                 return -ENOMEM;
 206
 207         ret = arcpgu_load(drm);
 208         if (ret)
 209                 goto err_unref;
 210
 211         ret = drm_dev_register(drm, 0);
 212         if (ret)
 213                 goto err_unload;
 214
 215         return 0;
 216
 217 err_unload:
 218         arcpgu_unload(drm);
 219
 220 err_unref:
 221         drm_dev_unref(drm);
 222
 223         return ret;
 224 }
 225
 226 static int arcpgu_remove(struct platform_device *pdev)
 227 {
 228         struct drm_device *drm = platform_get_drvdata(pdev);
 229
 230         drm_dev_unregister(drm);
 231         arcpgu_unload(drm);
 232         drm_dev_unref(drm);
 233
 234         return 0;
 235 }
 236
 237 static const struct of_device_id arcpgu_of_table[] = {
 238         {.compatible = "snps,arcpgu"},
 239         {}
 240 };
 241
 242 MODULE_DEVICE_TABLE(of, arcpgu_of_table);
 243
 244 static struct platform_driver arcpgu_platform_driver = {
 245         .probe = arcpgu_probe,
 246         .remove = arcpgu_remove,
 247         .driver = {
 248                    .name = "arcpgu",
 249                    .of_match_table = arcpgu_of_table,
 250                    },
 251 };
 252
 253 module_platform_driver(arcpgu_platform_driver);
 254
 255 MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
 256 MODULE_DESCRIPTION("ARC PGU DRM driver");
 257 MODULE_LICENSE("GPL");