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                 dev_err(drm->dev, "Could not remap IO mem\n");
 108                 return PTR_ERR(arcpgu->regs);
 109         }
 110
 111         dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
 112                  arc_pgu_read(arcpgu, ARCPGU_REG_ID));
 113
 114         /* Get the optional framebuffer memory resource */
 115         ret = of_reserved_mem_device_init(drm->dev);
 116         if (ret && ret != -ENODEV)
 117                 return ret;
 118
 119         if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
 120                 return -ENODEV;
 121
 122         if (arc_pgu_setup_crtc(drm) < 0)
 123                 return -ENODEV;
 124
 125         /* find the encoder node and initialize it */
 126         encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
 127         if (encoder_node) {
 128                 ret = arcpgu_drm_hdmi_init(drm, encoder_node);
 129                 of_node_put(encoder_node);
 130                 if (ret < 0)
 131                         return ret;
 132         } else {
 133                 ret = arcpgu_drm_sim_init(drm, NULL);
 134                 if (ret < 0)
 135                         return ret;
 136         }
 137
 138         drm_mode_config_reset(drm);
 139         drm_kms_helper_poll_init(drm);
 140
 141         arcpgu->fbdev = drm_fbdev_cma_init(drm, 16,
 142                                               drm->mode_config.num_crtc,
 143                                               drm->mode_config.num_connector);
 144         if (IS_ERR(arcpgu->fbdev)) {
 145                 ret = PTR_ERR(arcpgu->fbdev);
 146                 arcpgu->fbdev = NULL;
 147                 return -ENODEV;
 148         }
 149
 150         platform_set_drvdata(pdev, arcpgu);
 151         return 0;
 152 }
 153
 154 static int arcpgu_unload(struct drm_device *drm)
 155 {
 156         struct arcpgu_drm_private *arcpgu = drm->dev_private;
 157
 158         if (arcpgu->fbdev) {
 159                 drm_fbdev_cma_fini(arcpgu->fbdev);
 160                 arcpgu->fbdev = NULL;
 161         }
 162         drm_kms_helper_poll_fini(drm);
 163         drm_vblank_cleanup(drm);
 164         drm_mode_config_cleanup(drm);
 165
 166         return 0;
 167 }
 168
 169 static struct drm_driver arcpgu_drm_driver = {
 170         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
 171                            DRIVER_ATOMIC,
 172         .lastclose = arcpgu_lastclose,
 173         .name = "drm-arcpgu",
 174         .desc = "ARC PGU Controller",
 175         .date = "20160219",
 176         .major = 1,
 177         .minor = 0,
 178         .patchlevel = 0,
 179         .fops = &arcpgu_drm_ops,
 180         .dumb_create = drm_gem_cma_dumb_create,
 181         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 182         .dumb_destroy = drm_gem_dumb_destroy,
 183         .get_vblank_counter = drm_vblank_no_hw_counter,
 184         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 185         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 186         .gem_free_object_unlocked = drm_gem_cma_free_object,
 187         .gem_vm_ops = &drm_gem_cma_vm_ops,
 188         .gem_prime_export = drm_gem_prime_export,
 189         .gem_prime_import = drm_gem_prime_import,
 190         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 191         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 192         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 193         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 194         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 195 };
 196
 197 static int arcpgu_probe(struct platform_device *pdev)
 198 {
 199         struct drm_device *drm;
 200         int ret;
 201
 202         drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
 203         if (!drm)
 204                 return -ENOMEM;
 205
 206         ret = arcpgu_load(drm);
 207         if (ret)
 208                 goto err_unref;
 209
 210         ret = drm_dev_register(drm, 0);
 211         if (ret)
 212                 goto err_unload;
 213
 214         return 0;
 215
 216 err_unload:
 217         arcpgu_unload(drm);
 218
 219 err_unref:
 220         drm_dev_unref(drm);
 221
 222         return ret;
 223 }
 224
 225 static int arcpgu_remove(struct platform_device *pdev)
 226 {
 227         struct drm_device *drm = platform_get_drvdata(pdev);
 228
 229         drm_dev_unregister(drm);
 230         arcpgu_unload(drm);
 231         drm_dev_unref(drm);
 232
 233         return 0;
 234 }
 235
 236 static const struct of_device_id arcpgu_of_table[] = {
 237         {.compatible = "snps,arcpgu"},
 238         {}
 239 };
 240
 241 MODULE_DEVICE_TABLE(of, arcpgu_of_table);
 242
 243 static struct platform_driver arcpgu_platform_driver = {
 244         .probe = arcpgu_probe,
 245         .remove = arcpgu_remove,
 246         .driver = {
 247                    .name = "arcpgu",
 248                    .of_match_table = arcpgu_of_table,
 249                    },
 250 };
 251
 252 module_platform_driver(arcpgu_platform_driver);
 253
 254 MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
 255 MODULE_DESCRIPTION("ARC PGU DRM driver");
 256 MODULE_LICENSE("GPL");