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_device.h>
  20 #include <drm/drm_debugfs.h>
  21 #include <drm/drm_drv.h>
  22 #include <drm/drm_fb_cma_helper.h>
  23 #include <drm/drm_fb_helper.h>
  24 #include <drm/drm_gem_cma_helper.h>
  25 #include <drm/drm_gem_framebuffer_helper.h>
  26 #include <drm/drm_atomic_helper.h>
  27 #include <linux/dma-mapping.h>
  28 #include <linux/module.h>
  29 #include <linux/of_reserved_mem.h>
  30 #include <linux/platform_device.h>
  31
  32 #include "arcpgu.h"
  33 #include "arcpgu_regs.h"
  34
  35 static const struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
  36         .fb_create  = drm_gem_fb_create,
  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 int arcpgu_load(struct drm_device *drm)
  54 {
  55         struct platform_device *pdev = to_platform_device(drm->dev);
  56         struct arcpgu_drm_private *arcpgu;
  57         struct device_node *encoder_node;
  58         struct resource *res;
  59         int ret;
  60
  61         arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
  62         if (arcpgu == NULL)
  63                 return -ENOMEM;
  64
  65         drm->dev_private = arcpgu;
  66
  67         arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
  68         if (IS_ERR(arcpgu->clk))
  69                 return PTR_ERR(arcpgu->clk);
  70
  71         arcpgu_setup_mode_config(drm);
  72
  73         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  74         arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
  75         if (IS_ERR(arcpgu->regs))
  76                 return PTR_ERR(arcpgu->regs);
  77
  78         dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
  79                  arc_pgu_read(arcpgu, ARCPGU_REG_ID));
  80
  81         /* Get the optional framebuffer memory resource */
  82         ret = of_reserved_mem_device_init(drm->dev);
  83         if (ret && ret != -ENODEV)
  84                 return ret;
  85
  86         if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
  87                 return -ENODEV;
  88
  89         if (arc_pgu_setup_crtc(drm) < 0)
  90                 return -ENODEV;
  91
  92         /* find the encoder node and initialize it */
  93         encoder_node = of_parse_phandle(drm->dev->of_node, "encoder-slave", 0);
  94         if (encoder_node) {
  95                 ret = arcpgu_drm_hdmi_init(drm, encoder_node);
  96                 of_node_put(encoder_node);
  97                 if (ret < 0)
  98                         return ret;
  99         } else {
 100                 ret = arcpgu_drm_sim_init(drm, NULL);
 101                 if (ret < 0)
 102                         return ret;
 103         }
 104
 105         drm_mode_config_reset(drm);
 106         drm_kms_helper_poll_init(drm);
 107
 108         platform_set_drvdata(pdev, drm);
 109         return 0;
 110 }
 111
 112 static int arcpgu_unload(struct drm_device *drm)
 113 {
 114         drm_kms_helper_poll_fini(drm);
 115         drm_atomic_helper_shutdown(drm);
 116         drm_mode_config_cleanup(drm);
 117
 118         return 0;
 119 }
 120
 121 #ifdef CONFIG_DEBUG_FS
 122 static int arcpgu_show_pxlclock(struct seq_file *m, void *arg)
 123 {
 124         struct drm_info_node *node = (struct drm_info_node *)m->private;
 125         struct drm_device *drm = node->minor->dev;
 126         struct arcpgu_drm_private *arcpgu = drm->dev_private;
 127         unsigned long clkrate = clk_get_rate(arcpgu->clk);
 128         unsigned long mode_clock = arcpgu->crtc.mode.crtc_clock * 1000;
 129
 130         seq_printf(m, "hw  : %lu\n", clkrate);
 131         seq_printf(m, "mode: %lu\n", mode_clock);
 132         return 0;
 133 }
 134
 135 static struct drm_info_list arcpgu_debugfs_list[] = {
 136         { "clocks", arcpgu_show_pxlclock, 0 },
 137 };
 138
 139 static int arcpgu_debugfs_init(struct drm_minor *minor)
 140 {
 141         return drm_debugfs_create_files(arcpgu_debugfs_list,
 142                 ARRAY_SIZE(arcpgu_debugfs_list), minor->debugfs_root, minor);
 143 }
 144 #endif
 145
 146 static struct drm_driver arcpgu_drm_driver = {
 147         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
 148                            DRIVER_ATOMIC,
 149         .name = "arcpgu",
 150         .desc = "ARC PGU Controller",
 151         .date = "20160219",
 152         .major = 1,
 153         .minor = 0,
 154         .patchlevel = 0,
 155         .fops = &arcpgu_drm_ops,
 156         .dumb_create = drm_gem_cma_dumb_create,
 157         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 158         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 159         .gem_free_object_unlocked = drm_gem_cma_free_object,
 160         .gem_print_info = drm_gem_cma_print_info,
 161         .gem_vm_ops = &drm_gem_cma_vm_ops,
 162         .gem_prime_export = drm_gem_prime_export,
 163         .gem_prime_import = drm_gem_prime_import,
 164         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 165         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 166         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 167         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 168         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 169 #ifdef CONFIG_DEBUG_FS
 170         .debugfs_init = arcpgu_debugfs_init,
 171 #endif
 172 };
 173
 174 static int arcpgu_probe(struct platform_device *pdev)
 175 {
 176         struct drm_device *drm;
 177         int ret;
 178
 179         drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
 180         if (IS_ERR(drm))
 181                 return PTR_ERR(drm);
 182
 183         ret = arcpgu_load(drm);
 184         if (ret)
 185                 goto err_unref;
 186
 187         ret = drm_dev_register(drm, 0);
 188         if (ret)
 189                 goto err_unload;
 190
 191         drm_fbdev_generic_setup(drm, 16);
 192
 193         return 0;
 194
 195 err_unload:
 196         arcpgu_unload(drm);
 197
 198 err_unref:
 199         drm_dev_put(drm);
 200
 201         return ret;
 202 }
 203
 204 static int arcpgu_remove(struct platform_device *pdev)
 205 {
 206         struct drm_device *drm = platform_get_drvdata(pdev);
 207
 208         drm_dev_unregister(drm);
 209         arcpgu_unload(drm);
 210         drm_dev_put(drm);
 211
 212         return 0;
 213 }
 214
 215 static const struct of_device_id arcpgu_of_table[] = {
 216         {.compatible = "snps,arcpgu"},
 217         {}
 218 };
 219
 220 MODULE_DEVICE_TABLE(of, arcpgu_of_table);
 221
 222 static struct platform_driver arcpgu_platform_driver = {
 223         .probe = arcpgu_probe,
 224         .remove = arcpgu_remove,
 225         .driver = {
 226                    .name = "arcpgu",
 227                    .of_match_table = arcpgu_of_table,
 228                    },
 229 };
 230
 231 module_platform_driver(arcpgu_platform_driver);
 232
 233 MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
 234 MODULE_DESCRIPTION("ARC PGU DRM driver");
 235 MODULE_LICENSE("GPL");