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 DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);
  52
  53 static void arcpgu_lastclose(struct drm_device *drm)
  54 {
  55         struct arcpgu_drm_private *arcpgu = drm->dev_private;
  56
  57         drm_fbdev_cma_restore_mode(arcpgu->fbdev);
  58 }
  59
  60 static int arcpgu_load(struct drm_device *drm)
  61 {
  62         struct platform_device *pdev = to_platform_device(drm->dev);
  63         struct arcpgu_drm_private *arcpgu;
  64         struct device_node *encoder_node;
  65         struct resource *res;
  66         int ret;
  67
  68         arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
  69         if (arcpgu == NULL)
  70                 return -ENOMEM;
  71
  72         drm->dev_private = arcpgu;
  73
  74         arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
  75         if (IS_ERR(arcpgu->clk))
  76                 return PTR_ERR(arcpgu->clk);
  77
  78         arcpgu_setup_mode_config(drm);
  79
  80         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  81         arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
  82         if (IS_ERR(arcpgu->regs))
  83                 return PTR_ERR(arcpgu->regs);
  84
  85         dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
  86                  arc_pgu_read(arcpgu, ARCPGU_REG_ID));
  87
  88         /* Get the optional framebuffer memory resource */
  89         ret = of_reserved_mem_device_init(drm->dev);
  90         if (ret && ret != -ENODEV)
  91                 return ret;
  92
  93         if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
  94                 return -ENODEV;
  95
  96         if (arc_pgu_setup_crtc(drm) < 0)
  97                 return -ENODEV;
  98
  99         /* find the encoder node and initialize it */
 100         encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
 101         if (encoder_node) {
 102                 ret = arcpgu_drm_hdmi_init(drm, encoder_node);
 103                 of_node_put(encoder_node);
 104                 if (ret < 0)
 105                         return ret;
 106         } else {
 107                 ret = arcpgu_drm_sim_init(drm, NULL);
 108                 if (ret < 0)
 109                         return ret;
 110         }
 111
 112         drm_mode_config_reset(drm);
 113         drm_kms_helper_poll_init(drm);
 114
 115         arcpgu->fbdev = drm_fbdev_cma_init(drm, 16,
 116                                            drm->mode_config.num_connector);
 117         if (IS_ERR(arcpgu->fbdev)) {
 118                 ret = PTR_ERR(arcpgu->fbdev);
 119                 arcpgu->fbdev = NULL;
 120                 return -ENODEV;
 121         }
 122
 123         platform_set_drvdata(pdev, arcpgu);
 124         return 0;
 125 }
 126
 127 static int arcpgu_unload(struct drm_device *drm)
 128 {
 129         struct arcpgu_drm_private *arcpgu = drm->dev_private;
 130
 131         if (arcpgu->fbdev) {
 132                 drm_fbdev_cma_fini(arcpgu->fbdev);
 133                 arcpgu->fbdev = NULL;
 134         }
 135         drm_kms_helper_poll_fini(drm);
 136         drm_mode_config_cleanup(drm);
 137
 138         return 0;
 139 }
 140
 141 #ifdef CONFIG_DEBUG_FS
 142 static int arcpgu_show_pxlclock(struct seq_file *m, void *arg)
 143 {
 144         struct drm_info_node *node = (struct drm_info_node *)m->private;
 145         struct drm_device *drm = node->minor->dev;
 146         struct arcpgu_drm_private *arcpgu = drm->dev_private;
 147         unsigned long clkrate = clk_get_rate(arcpgu->clk);
 148         unsigned long mode_clock = arcpgu->crtc.mode.crtc_clock * 1000;
 149
 150         seq_printf(m, "hw  : %lu\n", clkrate);
 151         seq_printf(m, "mode: %lu\n", mode_clock);
 152         return 0;
 153 }
 154
 155 static struct drm_info_list arcpgu_debugfs_list[] = {
 156         { "clocks", arcpgu_show_pxlclock, 0 },
 157         { "fb", drm_fb_cma_debugfs_show, 0 },
 158 };
 159
 160 static int arcpgu_debugfs_init(struct drm_minor *minor)
 161 {
 162         return drm_debugfs_create_files(arcpgu_debugfs_list,
 163                 ARRAY_SIZE(arcpgu_debugfs_list), minor->debugfs_root, minor);
 164 }
 165 #endif
 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 = "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         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 182         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 183         .gem_free_object_unlocked = drm_gem_cma_free_object,
 184         .gem_vm_ops = &drm_gem_cma_vm_ops,
 185         .gem_prime_export = drm_gem_prime_export,
 186         .gem_prime_import = drm_gem_prime_import,
 187         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 188         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 189         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 190         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 191         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 192 #ifdef CONFIG_DEBUG_FS
 193         .debugfs_init = arcpgu_debugfs_init,
 194 #endif
 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 (IS_ERR(drm))
 204                 return PTR_ERR(drm);
 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");