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