drivers/gpu/drm/stm/drv.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) STMicroelectronics SA 2017
   4  *
   5  * Authors: Philippe Cornu <philippe.cornu@st.com>
   6  *          Yannick Fertre <yannick.fertre@st.com>
   7  *          Fabien Dessenne <fabien.dessenne@st.com>
   8  *          Mickael Reulier <mickael.reulier@st.com>
   9  */
  10
  11 #include <linux/component.h>
  12 #include <linux/of_platform.h>
  13
  14 #include <drm/drm_atomic.h>
  15 #include <drm/drm_atomic_helper.h>
  16 #include <drm/drm_crtc_helper.h>
  17 #include <drm/drm_fb_helper.h>
  18 #include <drm/drm_fb_cma_helper.h>
  19 #include <drm/drm_gem_cma_helper.h>
  20 #include <drm/drm_gem_framebuffer_helper.h>
  21
  22 #include "ltdc.h"
  23
  24 #define STM_MAX_FB_WIDTH        2048
  25 #define STM_MAX_FB_HEIGHT       2048 /* same as width to handle orientation */
  26
  27 static const struct drm_mode_config_funcs drv_mode_config_funcs = {
  28         .fb_create = drm_gem_fb_create,
  29         .output_poll_changed = drm_fb_helper_output_poll_changed,
  30         .atomic_check = drm_atomic_helper_check,
  31         .atomic_commit = drm_atomic_helper_commit,
  32 };
  33
  34 DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
  35
  36 static struct drm_driver drv_driver = {
  37         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
  38                            DRIVER_ATOMIC,
  39         .lastclose = drm_fb_helper_lastclose,
  40         .name = "stm",
  41         .desc = "STMicroelectronics SoC DRM",
  42         .date = "20170330",
  43         .major = 1,
  44         .minor = 0,
  45         .patchlevel = 0,
  46         .fops = &drv_driver_fops,
  47         .dumb_create = drm_gem_cma_dumb_create,
  48         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
  49         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
  50         .gem_free_object_unlocked = drm_gem_cma_free_object,
  51         .gem_vm_ops = &drm_gem_cma_vm_ops,
  52         .gem_prime_export = drm_gem_prime_export,
  53         .gem_prime_import = drm_gem_prime_import,
  54         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  55         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  56         .gem_prime_vmap = drm_gem_cma_prime_vmap,
  57         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
  58         .gem_prime_mmap = drm_gem_cma_prime_mmap,
  59         .enable_vblank = ltdc_crtc_enable_vblank,
  60         .disable_vblank = ltdc_crtc_disable_vblank,
  61 };
  62
  63 static int drv_load(struct drm_device *ddev)
  64 {
  65         struct platform_device *pdev = to_platform_device(ddev->dev);
  66         struct ltdc_device *ldev;
  67         int ret;
  68
  69         DRM_DEBUG("%s\n", __func__);
  70
  71         ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
  72         if (!ldev)
  73                 return -ENOMEM;
  74
  75         ddev->dev_private = (void *)ldev;
  76
  77         drm_mode_config_init(ddev);
  78
  79         /*
  80          * set max width and height as default value.
  81          * this value would be used to check framebuffer size limitation
  82          * at drm_mode_addfb().
  83          */
  84         ddev->mode_config.min_width = 0;
  85         ddev->mode_config.min_height = 0;
  86         ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
  87         ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
  88         ddev->mode_config.funcs = &drv_mode_config_funcs;
  89
  90         ret = ltdc_load(ddev);
  91         if (ret)
  92                 goto err;
  93
  94         drm_mode_config_reset(ddev);
  95         drm_kms_helper_poll_init(ddev);
  96
  97         if (ddev->mode_config.num_connector) {
  98                 ret = drm_fb_cma_fbdev_init(ddev, 16, 0);
  99                 if (ret)
 100                         DRM_DEBUG("Warning: fails to create fbdev\n");
 101         }
 102
 103         platform_set_drvdata(pdev, ddev);
 104
 105         return 0;
 106 err:
 107         drm_mode_config_cleanup(ddev);
 108         return ret;
 109 }
 110
 111 static void drv_unload(struct drm_device *ddev)
 112 {
 113         DRM_DEBUG("%s\n", __func__);
 114
 115         drm_fb_cma_fbdev_fini(ddev);
 116         drm_kms_helper_poll_fini(ddev);
 117         ltdc_unload(ddev);
 118         drm_mode_config_cleanup(ddev);
 119 }
 120
 121 static int stm_drm_platform_probe(struct platform_device *pdev)
 122 {
 123         struct device *dev = &pdev->dev;
 124         struct drm_device *ddev;
 125         int ret;
 126
 127         DRM_DEBUG("%s\n", __func__);
 128
 129         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 130
 131         ddev = drm_dev_alloc(&drv_driver, dev);
 132         if (IS_ERR(ddev))
 133                 return PTR_ERR(ddev);
 134
 135         ret = drv_load(ddev);
 136         if (ret)
 137                 goto err_unref;
 138
 139         ret = drm_dev_register(ddev, 0);
 140         if (ret)
 141                 goto err_unref;
 142
 143         return 0;
 144
 145 err_unref:
 146         drm_dev_unref(ddev);
 147
 148         return ret;
 149 }
 150
 151 static int stm_drm_platform_remove(struct platform_device *pdev)
 152 {
 153         struct drm_device *ddev = platform_get_drvdata(pdev);
 154
 155         DRM_DEBUG("%s\n", __func__);
 156
 157         drm_dev_unregister(ddev);
 158         drv_unload(ddev);
 159         drm_dev_unref(ddev);
 160
 161         return 0;
 162 }
 163
 164 static const struct of_device_id drv_dt_ids[] = {
 165         { .compatible = "st,stm32-ltdc"},
 166         { /* end node */ },
 167 };
 168 MODULE_DEVICE_TABLE(of, drv_dt_ids);
 169
 170 static struct platform_driver stm_drm_platform_driver = {
 171         .probe = stm_drm_platform_probe,
 172         .remove = stm_drm_platform_remove,
 173         .driver = {
 174                 .name = "stm32-display",
 175                 .of_match_table = drv_dt_ids,
 176         },
 177 };
 178
 179 module_platform_driver(stm_drm_platform_driver);
 180
 181 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
 182 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
 183 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
 184 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
 185 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 186 MODULE_LICENSE("GPL v2");