drivers/gpu/drm/stm/drv.c

   1 /*
   2  * Copyright (C) STMicroelectronics SA 2017
   3  *
   4  * Authors: Philippe Cornu <philippe.cornu@st.com>
   5  *          Yannick Fertre <yannick.fertre@st.com>
   6  *          Fabien Dessenne <fabien.dessenne@st.com>
   7  *          Mickael Reulier <mickael.reulier@st.com>
   8  *
   9  * License terms:  GNU General Public License (GPL), version 2
  10  */
  11
  12 #include <linux/component.h>
  13 #include <linux/of_platform.h>
  14
  15 #include <drm/drm_atomic.h>
  16 #include <drm/drm_atomic_helper.h>
  17 #include <drm/drm_crtc_helper.h>
  18 #include <drm/drm_fb_cma_helper.h>
  19 #include <drm/drm_gem_cma_helper.h>
  20
  21 #include "ltdc.h"
  22
  23 #define DRIVER_NAME             "stm"
  24 #define DRIVER_DESC             "STMicroelectronics SoC DRM"
  25 #define DRIVER_DATE             "20170330"
  26 #define DRIVER_MAJOR            1
  27 #define DRIVER_MINOR            0
  28 #define DRIVER_PATCH_LEVEL      0
  29
  30 #define STM_MAX_FB_WIDTH        2048
  31 #define STM_MAX_FB_HEIGHT       2048 /* same as width to handle orientation */
  32
  33 static void drv_output_poll_changed(struct drm_device *ddev)
  34 {
  35         struct ltdc_device *ldev = ddev->dev_private;
  36
  37         drm_fbdev_cma_hotplug_event(ldev->fbdev);
  38 }
  39
  40 static const struct drm_mode_config_funcs drv_mode_config_funcs = {
  41         .fb_create = drm_fb_cma_create,
  42         .output_poll_changed = drv_output_poll_changed,
  43         .atomic_check = drm_atomic_helper_check,
  44         .atomic_commit = drm_atomic_helper_commit,
  45 };
  46
  47 static void drv_lastclose(struct drm_device *ddev)
  48 {
  49         struct ltdc_device *ldev = ddev->dev_private;
  50
  51         DRM_DEBUG("%s\n", __func__);
  52
  53         drm_fbdev_cma_restore_mode(ldev->fbdev);
  54 }
  55
  56 DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
  57
  58 static struct drm_driver drv_driver = {
  59         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
  60                            DRIVER_ATOMIC,
  61         .lastclose = drv_lastclose,
  62         .name = DRIVER_NAME,
  63         .desc = DRIVER_DESC,
  64         .date = DRIVER_DATE,
  65         .major = DRIVER_MAJOR,
  66         .minor = DRIVER_MINOR,
  67         .patchlevel = DRIVER_PATCH_LEVEL,
  68         .fops = &drv_driver_fops,
  69         .dumb_create = drm_gem_cma_dumb_create,
  70         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
  71         .dumb_destroy = drm_gem_dumb_destroy,
  72         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
  73         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
  74         .gem_free_object_unlocked = drm_gem_cma_free_object,
  75         .gem_vm_ops = &drm_gem_cma_vm_ops,
  76         .gem_prime_export = drm_gem_prime_export,
  77         .gem_prime_import = drm_gem_prime_import,
  78         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  79         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  80         .gem_prime_vmap = drm_gem_cma_prime_vmap,
  81         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
  82         .gem_prime_mmap = drm_gem_cma_prime_mmap,
  83         .enable_vblank = ltdc_crtc_enable_vblank,
  84         .disable_vblank = ltdc_crtc_disable_vblank,
  85 };
  86
  87 static int drv_load(struct drm_device *ddev)
  88 {
  89         struct platform_device *pdev = to_platform_device(ddev->dev);
  90         struct drm_fbdev_cma *fbdev;
  91         struct ltdc_device *ldev;
  92         int ret;
  93
  94         DRM_DEBUG("%s\n", __func__);
  95
  96         ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
  97         if (!ldev)
  98                 return -ENOMEM;
  99
 100         ddev->dev_private = (void *)ldev;
 101
 102         drm_mode_config_init(ddev);
 103
 104         /*
 105          * set max width and height as default value.
 106          * this value would be used to check framebuffer size limitation
 107          * at drm_mode_addfb().
 108          */
 109         ddev->mode_config.min_width = 0;
 110         ddev->mode_config.min_height = 0;
 111         ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
 112         ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
 113         ddev->mode_config.funcs = &drv_mode_config_funcs;
 114
 115         ret = ltdc_load(ddev);
 116         if (ret)
 117                 goto err;
 118
 119         drm_mode_config_reset(ddev);
 120         drm_kms_helper_poll_init(ddev);
 121
 122         if (ddev->mode_config.num_connector) {
 123                 ldev = ddev->dev_private;
 124                 fbdev = drm_fbdev_cma_init(ddev, 16,
 125                                            ddev->mode_config.num_connector);
 126                 if (IS_ERR(fbdev)) {
 127                         DRM_DEBUG("Warning: fails to create fbdev\n");
 128                         fbdev = NULL;
 129                 }
 130                 ldev->fbdev = fbdev;
 131         }
 132
 133         platform_set_drvdata(pdev, ddev);
 134
 135         return 0;
 136 err:
 137         drm_mode_config_cleanup(ddev);
 138         return ret;
 139 }
 140
 141 static void drv_unload(struct drm_device *ddev)
 142 {
 143         struct ltdc_device *ldev = ddev->dev_private;
 144
 145         DRM_DEBUG("%s\n", __func__);
 146
 147         if (ldev->fbdev) {
 148                 drm_fbdev_cma_fini(ldev->fbdev);
 149                 ldev->fbdev = NULL;
 150         }
 151         drm_kms_helper_poll_fini(ddev);
 152         ltdc_unload(ddev);
 153         drm_mode_config_cleanup(ddev);
 154 }
 155
 156 static int stm_drm_platform_probe(struct platform_device *pdev)
 157 {
 158         struct device *dev = &pdev->dev;
 159         struct drm_device *ddev;
 160         int ret;
 161
 162         DRM_DEBUG("%s\n", __func__);
 163
 164         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 165
 166         ddev = drm_dev_alloc(&drv_driver, dev);
 167         if (IS_ERR(ddev))
 168                 return PTR_ERR(ddev);
 169
 170         ret = drv_load(ddev);
 171         if (ret)
 172                 goto err_unref;
 173
 174         ret = drm_dev_register(ddev, 0);
 175         if (ret)
 176                 goto err_unref;
 177
 178         return 0;
 179
 180 err_unref:
 181         drm_dev_unref(ddev);
 182
 183         return ret;
 184 }
 185
 186 static int stm_drm_platform_remove(struct platform_device *pdev)
 187 {
 188         struct drm_device *ddev = platform_get_drvdata(pdev);
 189
 190         DRM_DEBUG("%s\n", __func__);
 191
 192         drm_dev_unregister(ddev);
 193         drv_unload(ddev);
 194         drm_dev_unref(ddev);
 195
 196         return 0;
 197 }
 198
 199 static const struct of_device_id drv_dt_ids[] = {
 200         { .compatible = "st,stm32-ltdc"},
 201         { /* end node */ },
 202 };
 203 MODULE_DEVICE_TABLE(of, drv_dt_ids);
 204
 205 static struct platform_driver stm_drm_platform_driver = {
 206         .probe = stm_drm_platform_probe,
 207         .remove = stm_drm_platform_remove,
 208         .driver = {
 209                 .name = DRIVER_NAME,
 210                 .of_match_table = drv_dt_ids,
 211         },
 212 };
 213
 214 module_platform_driver(stm_drm_platform_driver);
 215
 216 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
 217 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
 218 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
 219 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
 220 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 221 MODULE_LICENSE("GPL v2");