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 };
  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         if (ddev->mode_config.num_connector) {
 112                 ret = drm_fb_cma_fbdev_init(ddev, 16, 0);
 113                 if (ret)
 114                         DRM_DEBUG("Warning: fails to create fbdev\n");
 115         }
 116
 117         platform_set_drvdata(pdev, ddev);
 118
 119         return 0;
 120 err:
 121         drm_mode_config_cleanup(ddev);
 122         return ret;
 123 }
 124
 125 static void drv_unload(struct drm_device *ddev)
 126 {
 127         DRM_DEBUG("%s\n", __func__);
 128
 129         drm_fb_cma_fbdev_fini(ddev);
 130         drm_kms_helper_poll_fini(ddev);
 131         ltdc_unload(ddev);
 132         drm_mode_config_cleanup(ddev);
 133 }
 134
 135 static int stm_drm_platform_probe(struct platform_device *pdev)
 136 {
 137         struct device *dev = &pdev->dev;
 138         struct drm_device *ddev;
 139         int ret;
 140
 141         DRM_DEBUG("%s\n", __func__);
 142
 143         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 144
 145         ddev = drm_dev_alloc(&drv_driver, dev);
 146         if (IS_ERR(ddev))
 147                 return PTR_ERR(ddev);
 148
 149         ret = drv_load(ddev);
 150         if (ret)
 151                 goto err_put;
 152
 153         ret = drm_dev_register(ddev, 0);
 154         if (ret)
 155                 goto err_put;
 156
 157         return 0;
 158
 159 err_put:
 160         drm_dev_put(ddev);
 161
 162         return ret;
 163 }
 164
 165 static int stm_drm_platform_remove(struct platform_device *pdev)
 166 {
 167         struct drm_device *ddev = platform_get_drvdata(pdev);
 168
 169         DRM_DEBUG("%s\n", __func__);
 170
 171         drm_dev_unregister(ddev);
 172         drv_unload(ddev);
 173         drm_dev_put(ddev);
 174
 175         return 0;
 176 }
 177
 178 static const struct of_device_id drv_dt_ids[] = {
 179         { .compatible = "st,stm32-ltdc"},
 180         { /* end node */ },
 181 };
 182 MODULE_DEVICE_TABLE(of, drv_dt_ids);
 183
 184 static struct platform_driver stm_drm_platform_driver = {
 185         .probe = stm_drm_platform_probe,
 186         .remove = stm_drm_platform_remove,
 187         .driver = {
 188                 .name = "stm32-display",
 189                 .of_match_table = drv_dt_ids,
 190         },
 191 };
 192
 193 module_platform_driver(stm_drm_platform_driver);
 194
 195 MODULE_AUTHOR("Philippe Cornu <philippe.cornu@st.com>");
 196 MODULE_AUTHOR("Yannick Fertre <yannick.fertre@st.com>");
 197 MODULE_AUTHOR("Fabien Dessenne <fabien.dessenne@st.com>");
 198 MODULE_AUTHOR("Mickael Reulier <mickael.reulier@st.com>");
 199 MODULE_DESCRIPTION("STMicroelectronics ST DRM LTDC driver");
 200 MODULE_LICENSE("GPL v2");