drivers/gpu/drm/arc/arcpgu_drv.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * ARC PGU DRM driver.
   4  *
   5  * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <drm/drm_atomic_helper.h>
  10 #include <drm/drm_debugfs.h>
  11 #include <drm/drm_device.h>
  12 #include <drm/drm_drv.h>
  13 #include <drm/drm_fb_cma_helper.h>
  14 #include <drm/drm_fb_helper.h>
  15 #include <drm/drm_gem_cma_helper.h>
  16 #include <drm/drm_gem_framebuffer_helper.h>
  17 #include <drm/drm_of.h>
  18 #include <drm/drm_probe_helper.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/module.h>
  21 #include <linux/of_reserved_mem.h>
  22 #include <linux/platform_device.h>
  23
  24 #include "arcpgu.h"
  25 #include "arcpgu_regs.h"
  26
  27 static const struct drm_mode_config_funcs arcpgu_drm_modecfg_funcs = {
  28         .fb_create  = drm_gem_fb_create,
  29         .atomic_check = drm_atomic_helper_check,
  30         .atomic_commit = drm_atomic_helper_commit,
  31 };
  32
  33 static void arcpgu_setup_mode_config(struct drm_device *drm)
  34 {
  35         drm_mode_config_init(drm);
  36         drm->mode_config.min_width = 0;
  37         drm->mode_config.min_height = 0;
  38         drm->mode_config.max_width = 1920;
  39         drm->mode_config.max_height = 1080;
  40         drm->mode_config.funcs = &arcpgu_drm_modecfg_funcs;
  41 }
  42
  43 DEFINE_DRM_GEM_CMA_FOPS(arcpgu_drm_ops);
  44
  45 static int arcpgu_load(struct drm_device *drm)
  46 {
  47         struct platform_device *pdev = to_platform_device(drm->dev);
  48         struct arcpgu_drm_private *arcpgu;
  49         struct device_node *encoder_node = NULL, *endpoint_node = NULL;
  50         struct resource *res;
  51         int ret;
  52
  53         arcpgu = devm_kzalloc(&pdev->dev, sizeof(*arcpgu), GFP_KERNEL);
  54         if (arcpgu == NULL)
  55                 return -ENOMEM;
  56
  57         drm->dev_private = arcpgu;
  58
  59         arcpgu->clk = devm_clk_get(drm->dev, "pxlclk");
  60         if (IS_ERR(arcpgu->clk))
  61                 return PTR_ERR(arcpgu->clk);
  62
  63         arcpgu_setup_mode_config(drm);
  64
  65         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  66         arcpgu->regs = devm_ioremap_resource(&pdev->dev, res);
  67         if (IS_ERR(arcpgu->regs))
  68                 return PTR_ERR(arcpgu->regs);
  69
  70         dev_info(drm->dev, "arc_pgu ID: 0x%x\n",
  71                  arc_pgu_read(arcpgu, ARCPGU_REG_ID));
  72
  73         /* Get the optional framebuffer memory resource */
  74         ret = of_reserved_mem_device_init(drm->dev);
  75         if (ret && ret != -ENODEV)
  76                 return ret;
  77
  78         if (dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)))
  79                 return -ENODEV;
  80
  81         if (arc_pgu_setup_crtc(drm) < 0)
  82                 return -ENODEV;
  83
  84         /*
  85          * There is only one output port inside each device. It is linked with
  86          * encoder endpoint.
  87          */
  88         endpoint_node = of_graph_get_next_endpoint(pdev->dev.of_node, NULL);
  89         if (endpoint_node) {
  90                 encoder_node = of_graph_get_remote_port_parent(endpoint_node);
  91                 of_node_put(endpoint_node);
  92         }
  93
  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                 dev_info(drm->dev, "no encoder found. Assumed virtual LCD on simulation platform\n");
 101                 ret = arcpgu_drm_sim_init(drm, NULL);
 102                 if (ret < 0)
 103                         return ret;
 104         }
 105
 106         drm_mode_config_reset(drm);
 107         drm_kms_helper_poll_init(drm);
 108
 109         platform_set_drvdata(pdev, drm);
 110         return 0;
 111 }
 112
 113 static int arcpgu_unload(struct drm_device *drm)
 114 {
 115         drm_kms_helper_poll_fini(drm);
 116         drm_atomic_helper_shutdown(drm);
 117         drm_mode_config_cleanup(drm);
 118
 119         return 0;
 120 }
 121
 122 #ifdef CONFIG_DEBUG_FS
 123 static int arcpgu_show_pxlclock(struct seq_file *m, void *arg)
 124 {
 125         struct drm_info_node *node = (struct drm_info_node *)m->private;
 126         struct drm_device *drm = node->minor->dev;
 127         struct arcpgu_drm_private *arcpgu = drm->dev_private;
 128         unsigned long clkrate = clk_get_rate(arcpgu->clk);
 129         unsigned long mode_clock = arcpgu->crtc.mode.crtc_clock * 1000;
 130
 131         seq_printf(m, "hw  : %lu\n", clkrate);
 132         seq_printf(m, "mode: %lu\n", mode_clock);
 133         return 0;
 134 }
 135
 136 static struct drm_info_list arcpgu_debugfs_list[] = {
 137         { "clocks", arcpgu_show_pxlclock, 0 },
 138 };
 139
 140 static void arcpgu_debugfs_init(struct drm_minor *minor)
 141 {
 142         drm_debugfs_create_files(arcpgu_debugfs_list,
 143                                  ARRAY_SIZE(arcpgu_debugfs_list),
 144                                  minor->debugfs_root, minor);
 145 }
 146 #endif
 147
 148 static struct drm_driver arcpgu_drm_driver = {
 149         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 150         .name = "arcpgu",
 151         .desc = "ARC PGU Controller",
 152         .date = "20160219",
 153         .major = 1,
 154         .minor = 0,
 155         .patchlevel = 0,
 156         .fops = &arcpgu_drm_ops,
 157         DRM_GEM_CMA_DRIVER_OPS,
 158 #ifdef CONFIG_DEBUG_FS
 159         .debugfs_init = arcpgu_debugfs_init,
 160 #endif
 161 };
 162
 163 static int arcpgu_probe(struct platform_device *pdev)
 164 {
 165         struct drm_device *drm;
 166         int ret;
 167
 168         drm = drm_dev_alloc(&arcpgu_drm_driver, &pdev->dev);
 169         if (IS_ERR(drm))
 170                 return PTR_ERR(drm);
 171
 172         ret = arcpgu_load(drm);
 173         if (ret)
 174                 goto err_unref;
 175
 176         ret = drm_dev_register(drm, 0);
 177         if (ret)
 178                 goto err_unload;
 179
 180         drm_fbdev_generic_setup(drm, 16);
 181
 182         return 0;
 183
 184 err_unload:
 185         arcpgu_unload(drm);
 186
 187 err_unref:
 188         drm_dev_put(drm);
 189
 190         return ret;
 191 }
 192
 193 static int arcpgu_remove(struct platform_device *pdev)
 194 {
 195         struct drm_device *drm = platform_get_drvdata(pdev);
 196
 197         drm_dev_unregister(drm);
 198         arcpgu_unload(drm);
 199         drm_dev_put(drm);
 200
 201         return 0;
 202 }
 203
 204 static const struct of_device_id arcpgu_of_table[] = {
 205         {.compatible = "snps,arcpgu"},
 206         {}
 207 };
 208
 209 MODULE_DEVICE_TABLE(of, arcpgu_of_table);
 210
 211 static struct platform_driver arcpgu_platform_driver = {
 212         .probe = arcpgu_probe,
 213         .remove = arcpgu_remove,
 214         .driver = {
 215                    .name = "arcpgu",
 216                    .of_match_table = arcpgu_of_table,
 217                    },
 218 };
 219
 220 module_platform_driver(arcpgu_platform_driver);
 221
 222 MODULE_AUTHOR("Carlos Palminha <palminha@synopsys.com>");
 223 MODULE_DESCRIPTION("ARC PGU DRM driver");
 224 MODULE_LICENSE("GPL");