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