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 static int stm_gem_cma_dumb_create(struct drm_file *file,
  35                                    struct drm_device *dev,
  36                                    struct drm_mode_create_dumb *args)
  37 {
  38         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
  39
  40         /*
  41          * in order to optimize data transfer, pitch is aligned on
  42          * 128 bytes, height is aligned on 4 bytes
  43          */
  44         args->pitch = roundup(min_pitch, 128);
  45         args->height = roundup(args->height, 4);
  46
  47         return drm_gem_cma_dumb_create_internal(file, dev, args);
  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 = drm_fb_helper_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 = stm_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         .get_scanout_position = ltdc_crtc_scanoutpos,
  76         .get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
  77 };
  78
  79 static int drv_load(struct drm_device *ddev)
  80 {
  81         struct platform_device *pdev = to_platform_device(ddev->dev);
  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                 ret = drm_fb_cma_fbdev_init(ddev, 16, 0);
 115                 if (ret)
 116                         DRM_DEBUG("Warning: fails to create fbdev\n");
 117         }
 118
 119         platform_set_drvdata(pdev, ddev);
 120
 121         return 0;
 122 err:
 123         drm_mode_config_cleanup(ddev);
 124         return ret;
 125 }
 126
 127 static void drv_unload(struct drm_device *ddev)
 128 {
 129         DRM_DEBUG("%s\n", __func__);
 130
 131         drm_fb_cma_fbdev_fini(ddev);
 132         drm_kms_helper_poll_fini(ddev);
 133         ltdc_unload(ddev);
 134         drm_mode_config_cleanup(ddev);
 135 }
 136
 137 static int stm_drm_platform_probe(struct platform_device *pdev)
 138 {
 139         struct device *dev = &pdev->dev;
 140         struct drm_device *ddev;
 141         int ret;
 142
 143         DRM_DEBUG("%s\n", __func__);
 144
 145         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 146
 147         ddev = drm_dev_alloc(&drv_driver, dev);
 148         if (IS_ERR(ddev))
 149                 return PTR_ERR(ddev);
 150
 151         ret = drv_load(ddev);
 152         if (ret)
 153                 goto err_put;
 154
 155         ret = drm_dev_register(ddev, 0);
 156         if (ret)
 157                 goto err_put;
 158
 159         return 0;
 160
 161 err_put:
 162         drm_dev_put(ddev);
 163
 164         return ret;
 165 }
 166
 167 static int stm_drm_platform_remove(struct platform_device *pdev)
 168 {
 169         struct drm_device *ddev = platform_get_drvdata(pdev);
 170
 171         DRM_DEBUG("%s\n", __func__);
 172
 173         drm_dev_unregister(ddev);
 174         drv_unload(ddev);
 175         drm_dev_put(ddev);
 176
 177         return 0;
 178 }
 179
 180 static const struct of_device_id drv_dt_ids[] = {
 181         { .compatible = "st,stm32-ltdc"},
 182         { /* end node */ },
 183 };
 184 MODULE_DEVICE_TABLE(of, drv_dt_ids);
 185
 186 static struct platform_driver stm_drm_platform_driver = {
 187         .probe = stm_drm_platform_probe,
 188         .remove = stm_drm_platform_remove,
 189         .driver = {
 190                 .name = "stm32-display",
 191                 .of_match_table = drv_dt_ids,
 192         },
 193 };
 194
 195 module_platform_driver(stm_drm_platform_driver);
 196
 197 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
 198 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
 199 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
 200 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
 201 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 202 MODULE_LICENSE("GPL v2");