drivers/gpu/drm/sprd/sprd_drm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2020 Unisoc Inc.
   4  */
   5
   6 #include <linux/component.h>
   7 #include <linux/dma-mapping.h>
   8 #include <linux/mod_devicetable.h>
   9 #include <linux/module.h>
  10 #include <linux/mutex.h>
  11 #include <linux/of_graph.h>
  12 #include <linux/platform_device.h>
  13
  14 #include <drm/drm_atomic_helper.h>
  15 #include <drm/drm_drv.h>
  16 #include <drm/drm_gem_dma_helper.h>
  17 #include <drm/drm_gem_framebuffer_helper.h>
  18 #include <drm/drm_of.h>
  19 #include <drm/drm_probe_helper.h>
  20 #include <drm/drm_vblank.h>
  21
  22 #include "sprd_drm.h"
  23
  24 #define DRIVER_NAME     "sprd"
  25 #define DRIVER_DESC     "Spreadtrum SoCs' DRM Driver"
  26 #define DRIVER_DATE     "20200201"
  27 #define DRIVER_MAJOR    1
  28 #define DRIVER_MINOR    0
  29
  30 static const struct drm_mode_config_helper_funcs sprd_drm_mode_config_helper = {
  31         .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
  32 };
  33
  34 static const struct drm_mode_config_funcs sprd_drm_mode_config_funcs = {
  35         .fb_create = drm_gem_fb_create,
  36         .atomic_check = drm_atomic_helper_check,
  37         .atomic_commit = drm_atomic_helper_commit,
  38 };
  39
  40 static void sprd_drm_mode_config_init(struct drm_device *drm)
  41 {
  42         drm->mode_config.min_width = 0;
  43         drm->mode_config.min_height = 0;
  44         drm->mode_config.max_width = 8192;
  45         drm->mode_config.max_height = 8192;
  46
  47         drm->mode_config.funcs = &sprd_drm_mode_config_funcs;
  48         drm->mode_config.helper_private = &sprd_drm_mode_config_helper;
  49 }
  50
  51 DEFINE_DRM_GEM_DMA_FOPS(sprd_drm_fops);
  52
  53 static struct drm_driver sprd_drm_drv = {
  54         .driver_features        = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
  55         .fops                   = &sprd_drm_fops,
  56
  57         /* GEM Operations */
  58         DRM_GEM_DMA_DRIVER_OPS,
  59
  60         .name                   = DRIVER_NAME,
  61         .desc                   = DRIVER_DESC,
  62         .date                   = DRIVER_DATE,
  63         .major                  = DRIVER_MAJOR,
  64         .minor                  = DRIVER_MINOR,
  65 };
  66
  67 static int sprd_drm_bind(struct device *dev)
  68 {
  69         struct platform_device *pdev = to_platform_device(dev);
  70         struct drm_device *drm;
  71         struct sprd_drm *sprd;
  72         int ret;
  73
  74         sprd = devm_drm_dev_alloc(dev, &sprd_drm_drv, struct sprd_drm, drm);
  75         if (IS_ERR(sprd))
  76                 return PTR_ERR(sprd);
  77
  78         drm = &sprd->drm;
  79         platform_set_drvdata(pdev, drm);
  80
  81         ret = drmm_mode_config_init(drm);
  82         if (ret)
  83                 return ret;
  84
  85         sprd_drm_mode_config_init(drm);
  86
  87         /* bind and init sub drivers */
  88         ret = component_bind_all(drm->dev, drm);
  89         if (ret) {
  90                 drm_err(drm, "failed to bind all component.\n");
  91                 return ret;
  92         }
  93
  94         /* vblank init */
  95         ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
  96         if (ret) {
  97                 drm_err(drm, "failed to initialize vblank.\n");
  98                 goto err_unbind_all;
  99         }
 100
 101         /* reset all the states of crtc/plane/encoder/connector */
 102         drm_mode_config_reset(drm);
 103
 104         /* init kms poll for handling hpd */
 105         drm_kms_helper_poll_init(drm);
 106
 107         ret = drm_dev_register(drm, 0);
 108         if (ret < 0)
 109                 goto err_kms_helper_poll_fini;
 110
 111         return 0;
 112
 113 err_kms_helper_poll_fini:
 114         drm_kms_helper_poll_fini(drm);
 115 err_unbind_all:
 116         component_unbind_all(drm->dev, drm);
 117         return ret;
 118 }
 119
 120 static void sprd_drm_unbind(struct device *dev)
 121 {
 122         struct drm_device *drm = dev_get_drvdata(dev);
 123
 124         drm_dev_unregister(drm);
 125
 126         drm_kms_helper_poll_fini(drm);
 127
 128         component_unbind_all(drm->dev, drm);
 129 }
 130
 131 static const struct component_master_ops drm_component_ops = {
 132         .bind = sprd_drm_bind,
 133         .unbind = sprd_drm_unbind,
 134 };
 135
 136 static int sprd_drm_probe(struct platform_device *pdev)
 137 {
 138         return drm_of_component_probe(&pdev->dev, component_compare_of, &drm_component_ops);
 139 }
 140
 141 static void sprd_drm_remove(struct platform_device *pdev)
 142 {
 143         component_master_del(&pdev->dev, &drm_component_ops);
 144 }
 145
 146 static void sprd_drm_shutdown(struct platform_device *pdev)
 147 {
 148         struct drm_device *drm = platform_get_drvdata(pdev);
 149
 150         if (!drm) {
 151                 dev_warn(&pdev->dev, "drm device is not available, no shutdown\n");
 152                 return;
 153         }
 154
 155         drm_atomic_helper_shutdown(drm);
 156 }
 157
 158 static const struct of_device_id drm_match_table[] = {
 159         { .compatible = "sprd,display-subsystem", },
 160         { /* sentinel */ },
 161 };
 162 MODULE_DEVICE_TABLE(of, drm_match_table);
 163
 164 static struct platform_driver sprd_drm_driver = {
 165         .probe = sprd_drm_probe,
 166         .remove = sprd_drm_remove,
 167         .shutdown = sprd_drm_shutdown,
 168         .driver = {
 169                 .name = "sprd-drm-drv",
 170                 .of_match_table = drm_match_table,
 171         },
 172 };
 173
 174 static struct platform_driver *sprd_drm_drivers[]  = {
 175         &sprd_drm_driver,
 176         &sprd_dpu_driver,
 177         &sprd_dsi_driver,
 178 };
 179
 180 static int __init sprd_drm_init(void)
 181 {
 182         if (drm_firmware_drivers_only())
 183                 return -ENODEV;
 184
 185         return platform_register_drivers(sprd_drm_drivers,
 186                                         ARRAY_SIZE(sprd_drm_drivers));
 187 }
 188
 189 static void __exit sprd_drm_exit(void)
 190 {
 191         platform_unregister_drivers(sprd_drm_drivers,
 192                                     ARRAY_SIZE(sprd_drm_drivers));
 193 }
 194
 195 module_init(sprd_drm_init);
 196 module_exit(sprd_drm_exit);
 197
 198 MODULE_AUTHOR("Leon He <leon.he@unisoc.com>");
 199 MODULE_AUTHOR("Kevin Tang <kevin.tang@unisoc.com>");
 200 MODULE_DESCRIPTION("Unisoc DRM KMS Master Driver");
 201 MODULE_LICENSE("GPL v2");