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_gem_framebuffer_helper.h>
  22 #include <drm/drm_atomic_helper.h>
  23 #include <linux/of_reserved_mem.h>
  24
  25 #include "arcpgu.h"
  26 #include "arcpgu_regs.h"
  27
  28 static void arcpgu_fb_output_poll_changed(struct drm_device *dev)
  29 {
  30         struct arcpgu_drm_private *arcpgu = dev->dev_private;
  31
  32         drm_fbdev_cma_hotplug_event(arcpgu->fbdev);
  33 }
  34
  35 static const struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
  36         .fb_create  = drm_gem_fb_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 DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);
  53
  54 static void arcpgu_lastclose(struct drm_device *drm)
  55 {
  56         struct arcpgu_drm_private *arcpgu = drm->dev_private;
  57
  58         drm_fbdev_cma_restore_mode(arcpgu->fbdev);
  59 }
  60
  61 static int arcpgu_load(struct drm_device *drm)
  62 {
  63         struct platform_device *pdev = to_platform_device(drm->dev);
  64         struct arcpgu_drm_private *arcpgu;
  65         struct device_node *encoder_node;
  66         struct resource *res;
  67         int ret;
  68
  69         arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
  70         if (arcpgu == NULL)
  71                 return -ENOMEM;
  72
  73         drm->dev_private = arcpgu;
  74
  75         arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
  76         if (IS_ERR(arcpgu->clk))
  77                 return PTR_ERR(arcpgu->clk);
  78
  79         arcpgu_setup_mode_config(drm);
  80
  81         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  82         arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
  83         if (IS_ERR(arcpgu->regs))
  84                 return PTR_ERR(arcpgu->regs);
  85
  86         dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
  87                  arc_pgu_read(arcpgu, ARCPGU_REG_ID));
  88
  89         /* Get the optional framebuffer memory resource */
  90         ret = of_reserved_mem_device_init(drm->dev);
  91         if (ret && ret != -ENODEV)
  92                 return ret;
  93
  94         if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
  95                 return -ENODEV;
  96
  97         if (arc_pgu_setup_crtc(drm) < 0)
  98                 return -ENODEV;
  99
 100         /* find the encoder node and initialize it */
 101         encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
 102         if (encoder_node) {
 103                 ret = arcpgu_drm_hdmi_init(drm, encoder_node);
 104                 of_node_put(encoder_node);
 105                 if (ret < 0)
 106                         return ret;
 107         } else {
 108                 ret = arcpgu_drm_sim_init(drm, NULL);
 109                 if (ret < 0)
 110                         return ret;
 111         }
 112
 113         drm_mode_config_reset(drm);
 114         drm_kms_helper_poll_init(drm);
 115
 116         arcpgu->fbdev = drm_fbdev_cma_init(drm, 16,
 117                                            drm->mode_config.num_connector);
 118         if (IS_ERR(arcpgu->fbdev)) {
 119                 ret = PTR_ERR(arcpgu->fbdev);
 120                 arcpgu->fbdev = NULL;
 121                 return -ENODEV;
 122         }
 123
 124         platform_set_drvdata(pdev, drm);
 125         return 0;
 126 }
 127
 128 static int arcpgu_unload(struct drm_device *drm)
 129 {
 130         struct arcpgu_drm_private *arcpgu = drm->dev_private;
 131
 132         if (arcpgu->fbdev) {
 133                 drm_fbdev_cma_fini(arcpgu->fbdev);
 134                 arcpgu->fbdev = NULL;
 135         }
 136         drm_kms_helper_poll_fini(drm);
 137         drm_mode_config_cleanup(drm);
 138
 139         return 0;
 140 }
 141
 142 #ifdef CONFIG_DEBUG_FS
 143 static int arcpgu_show_pxlclock(struct seq_file *m, void *arg)
 144 {
 145         struct drm_info_node *node = (struct drm_info_node *)m->private;
 146         struct drm_device *drm = node->minor->dev;
 147         struct arcpgu_drm_private *arcpgu = drm->dev_private;
 148         unsigned long clkrate = clk_get_rate(arcpgu->clk);
 149         unsigned long mode_clock = arcpgu->crtc.mode.crtc_clock * 1000;
 150
 151         seq_printf(m, "hw  : %lu\n", clkrate);
 152         seq_printf(m, "mode: %lu\n", mode_clock);
 153         return 0;
 154 }
 155
 156 static struct drm_info_list arcpgu_debugfs_list[] = {
 157         { "clocks", arcpgu_show_pxlclock, 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         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 180         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 181         .gem_free_object_unlocked = drm_gem_cma_free_object,
 182         .gem_print_info = drm_gem_cma_print_info,
 183         .gem_vm_ops = &drm_gem_cma_vm_ops,
 184         .gem_prime_export = drm_gem_prime_export,
 185         .gem_prime_import = drm_gem_prime_import,
 186         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 187         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 188         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 189         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 190         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 191 #ifdef CONFIG_DEBUG_FS
 192         .debugfs_init = arcpgu_debugfs_init,
 193 #endif
 194 };
 195
 196 static int arcpgu_probe(struct platform_device *pdev)
 197 {
 198         struct drm_device *drm;
 199         int ret;
 200
 201         drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
 202         if (IS_ERR(drm))
 203                 return PTR_ERR(drm);
 204
 205         ret = arcpgu_load(drm);
 206         if (ret)
 207                 goto err_unref;
 208
 209         ret = drm_dev_register(drm, 0);
 210         if (ret)
 211                 goto err_unload;
 212
 213         return 0;
 214
 215 err_unload:
 216         arcpgu_unload(drm);
 217
 218 err_unref:
 219         drm_dev_unref(drm);
 220
 221         return ret;
 222 }
 223
 224 static int arcpgu_remove(struct platform_device *pdev)
 225 {
 226         struct drm_device *drm = platform_get_drvdata(pdev);
 227
 228         drm_dev_unregister(drm);
 229         arcpgu_unload(drm);
 230         drm_dev_unref(drm);
 231
 232         return 0;
 233 }
 234
 235 static const struct of_device_id arcpgu_of_table[] = {
 236         {.compatible = "snps,arcpgu"},
 237         {}
 238 };
 239
 240 MODULE_DEVICE_TABLE(of, arcpgu_of_table);
 241
 242 static struct platform_driver arcpgu_platform_driver = {
 243         .probe = arcpgu_probe,
 244         .remove = arcpgu_remove,
 245         .driver = {
 246                    .name = "arcpgu",
 247                    .of_match_table = arcpgu_of_table,
 248                    },
 249 };
 250
 251 module_platform_driver(arcpgu_platform_driver);
 252
 253 MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
 254 MODULE_DESCRIPTION("ARC PGU DRM driver");
 255 MODULE_LICENSE("GPL");