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/dma-mapping.h>
  13 #include <linux/module.h>
  14 #include <linux/of_platform.h>
  15
  16 #include <drm/drm_atomic.h>
  17 #include <drm/drm_atomic_helper.h>
  18 #include <drm/drm_drv.h>
  19 #include <drm/drm_fb_cma_helper.h>
  20 #include <drm/drm_fb_helper.h>
  21 #include <drm/drm_gem_cma_helper.h>
  22 #include <drm/drm_gem_framebuffer_helper.h>
  23 #include <drm/drm_probe_helper.h>
  24 #include <drm/drm_vblank.h>
  25
  26 #include "ltdc.h"
  27
  28 #define STM_MAX_FB_WIDTH        2048
  29 #define STM_MAX_FB_HEIGHT       2048 /* same as width to handle orientation */
  30
  31 static const struct drm_mode_config_funcs drv_mode_config_funcs = {
  32         .fb_create = drm_gem_fb_create,
  33         .atomic_check = drm_atomic_helper_check,
  34         .atomic_commit = drm_atomic_helper_commit,
  35 };
  36
  37 static int stm_gem_cma_dumb_create(struct drm_file *file,
  38                                    struct drm_device *dev,
  39                                    struct drm_mode_create_dumb *args)
  40 {
  41         unsigned int min_pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
  42
  43         /*
  44          * in order to optimize data transfer, pitch is aligned on
  45          * 128 bytes, height is aligned on 4 bytes
  46          */
  47         args->pitch = roundup(min_pitch, 128);
  48         args->height = roundup(args->height, 4);
  49
  50         return drm_gem_cma_dumb_create_internal(file, dev, args);
  51 }
  52
  53 DEFINE_DRM_GEM_CMA_FOPS(drv_driver_fops);
  54
  55 static struct drm_driver drv_driver = {
  56         .driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME |
  57                            DRIVER_ATOMIC,
  58         .name = "stm",
  59         .desc = "STMicroelectronics SoC DRM",
  60         .date = "20170330",
  61         .major = 1,
  62         .minor = 0,
  63         .patchlevel = 0,
  64         .fops = &drv_driver_fops,
  65         .dumb_create = stm_gem_cma_dumb_create,
  66         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
  67         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
  68         .gem_free_object_unlocked = drm_gem_cma_free_object,
  69         .gem_vm_ops = &drm_gem_cma_vm_ops,
  70         .gem_prime_export = drm_gem_prime_export,
  71         .gem_prime_import = drm_gem_prime_import,
  72         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
  73         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
  74         .gem_prime_vmap = drm_gem_cma_prime_vmap,
  75         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
  76         .gem_prime_mmap = drm_gem_cma_prime_mmap,
  77         .get_scanout_position = ltdc_crtc_scanoutpos,
  78         .get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
  79 };
  80
  81 static int drv_load(struct drm_device *ddev)
  82 {
  83         struct platform_device *pdev = to_platform_device(ddev->dev);
  84         struct ltdc_device *ldev;
  85         int ret;
  86
  87         DRM_DEBUG("%s\n", __func__);
  88
  89         ldev = devm_kzalloc(ddev->dev, sizeof(*ldev), GFP_KERNEL);
  90         if (!ldev)
  91                 return -ENOMEM;
  92
  93         ddev->dev_private = (void *)ldev;
  94
  95         drm_mode_config_init(ddev);
  96
  97         /*
  98          * set max width and height as default value.
  99          * this value would be used to check framebuffer size limitation
 100          * at drm_mode_addfb().
 101          */
 102         ddev->mode_config.min_width = 0;
 103         ddev->mode_config.min_height = 0;
 104         ddev->mode_config.max_width = STM_MAX_FB_WIDTH;
 105         ddev->mode_config.max_height = STM_MAX_FB_HEIGHT;
 106         ddev->mode_config.funcs = &drv_mode_config_funcs;
 107
 108         ret = ltdc_load(ddev);
 109         if (ret)
 110                 goto err;
 111
 112         drm_mode_config_reset(ddev);
 113         drm_kms_helper_poll_init(ddev);
 114
 115         platform_set_drvdata(pdev, ddev);
 116
 117         return 0;
 118 err:
 119         drm_mode_config_cleanup(ddev);
 120         return ret;
 121 }
 122
 123 static void drv_unload(struct drm_device *ddev)
 124 {
 125         DRM_DEBUG("%s\n", __func__);
 126
 127         drm_kms_helper_poll_fini(ddev);
 128         ltdc_unload(ddev);
 129         drm_mode_config_cleanup(ddev);
 130 }
 131
 132 static int stm_drm_platform_probe(struct platform_device *pdev)
 133 {
 134         struct device *dev = &pdev->dev;
 135         struct drm_device *ddev;
 136         int ret;
 137
 138         DRM_DEBUG("%s\n", __func__);
 139
 140         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 141
 142         ddev = drm_dev_alloc(&drv_driver, dev);
 143         if (IS_ERR(ddev))
 144                 return PTR_ERR(ddev);
 145
 146         ret = drv_load(ddev);
 147         if (ret)
 148                 goto err_put;
 149
 150         ret = drm_dev_register(ddev, 0);
 151         if (ret)
 152                 goto err_put;
 153
 154         drm_fbdev_generic_setup(ddev, 16);
 155
 156         return 0;
 157
 158 err_put:
 159         drm_dev_put(ddev);
 160
 161         return ret;
 162 }
 163
 164 static int stm_drm_platform_remove(struct platform_device *pdev)
 165 {
 166         struct drm_device *ddev = platform_get_drvdata(pdev);
 167
 168         DRM_DEBUG("%s\n", __func__);
 169
 170         drm_dev_unregister(ddev);
 171         drv_unload(ddev);
 172         drm_dev_put(ddev);
 173
 174         return 0;
 175 }
 176
 177 static const struct of_device_id drv_dt_ids[] = {
 178         { .compatible = "st,stm32-ltdc"},
 179         { /* end node */ },
 180 };
 181 MODULE_DEVICE_TABLE(of, drv_dt_ids);
 182
 183 static struct platform_driver stm_drm_platform_driver = {
 184         .probe = stm_drm_platform_probe,
 185         .remove = stm_drm_platform_remove,
 186         .driver = {
 187                 .name = "stm32-display",
 188                 .of_match_table = drv_dt_ids,
 189         },
 190 };
 191
 192 module_platform_driver(stm_drm_platform_driver);
 193
 194 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
 195 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
 196 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
 197 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
 198 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 199 MODULE_LICENSE("GPL v2");