drivers/gpu/drm/stm/drv.c

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