drivers/gpu/drm/sti/sti_drm_drv.c

   1 /*
   2  * Copyright (C) STMicroelectronics SA 2014
   3  * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics.
   4  * License terms:  GNU General Public License (GPL), version 2
   5  */
   6
   7 #include <drm/drmP.h>
   8
   9 #include <linux/component.h>
  10 #include <linux/debugfs.h>
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/of_platform.h>
  14
  15 #include <drm/drm_crtc_helper.h>
  16 #include <drm/drm_gem_cma_helper.h>
  17 #include <drm/drm_fb_cma_helper.h>
  18
  19 #include "sti_drm_drv.h"
  20 #include "sti_drm_crtc.h"
  21
  22 #define DRIVER_NAME     "sti"
  23 #define DRIVER_DESC     "STMicroelectronics SoC DRM"
  24 #define DRIVER_DATE     "20140601"
  25 #define DRIVER_MAJOR    1
  26 #define DRIVER_MINOR    0
  27
  28 #define STI_MAX_FB_HEIGHT       4096
  29 #define STI_MAX_FB_WIDTH        4096
  30
  31 static struct drm_mode_config_funcs sti_drm_mode_config_funcs = {
  32         .fb_create = drm_fb_cma_create,
  33 };
  34
  35 static void sti_drm_mode_config_init(struct drm_device *dev)
  36 {
  37         dev->mode_config.min_width = 0;
  38         dev->mode_config.min_height = 0;
  39
  40         /*
  41          * set max width and height as default value.
  42          * this value would be used to check framebuffer size limitation
  43          * at drm_mode_addfb().
  44          */
  45         dev->mode_config.max_width = STI_MAX_FB_HEIGHT;
  46         dev->mode_config.max_height = STI_MAX_FB_WIDTH;
  47
  48         dev->mode_config.funcs = &sti_drm_mode_config_funcs;
  49 }
  50
  51 static int sti_drm_load(struct drm_device *dev, unsigned long flags)
  52 {
  53         struct sti_drm_private *private;
  54         int ret;
  55
  56         private = kzalloc(sizeof(struct sti_drm_private), GFP_KERNEL);
  57         if (!private) {
  58                 DRM_ERROR("Failed to allocate private\n");
  59                 return -ENOMEM;
  60         }
  61         dev->dev_private = (void *)private;
  62         private->drm_dev = dev;
  63
  64         drm_mode_config_init(dev);
  65         drm_kms_helper_poll_init(dev);
  66
  67         sti_drm_mode_config_init(dev);
  68
  69         ret = component_bind_all(dev->dev, dev);
  70         if (ret)
  71                 return ret;
  72
  73         drm_helper_disable_unused_functions(dev);
  74
  75 #ifdef CONFIG_DRM_STI_FBDEV
  76         drm_fbdev_cma_init(dev, 32,
  77                    dev->mode_config.num_crtc,
  78                    dev->mode_config.num_connector);
  79 #endif
  80         return 0;
  81 }
  82
  83 static const struct file_operations sti_drm_driver_fops = {
  84         .owner = THIS_MODULE,
  85         .open = drm_open,
  86         .mmap = drm_gem_cma_mmap,
  87         .poll = drm_poll,
  88         .read = drm_read,
  89         .unlocked_ioctl = drm_ioctl,
  90 #ifdef CONFIG_COMPAT
  91         .compat_ioctl = drm_compat_ioctl,
  92 #endif
  93         .release = drm_release,
  94 };
  95
  96 static struct dma_buf *sti_drm_gem_prime_export(struct drm_device *dev,
  97                                                 struct drm_gem_object *obj,
  98                                                 int flags)
  99 {
 100         /* we want to be able to write in mmapped buffer */
 101         flags |= O_RDWR;
 102         return drm_gem_prime_export(dev, obj, flags);
 103 }
 104
 105 static struct drm_driver sti_drm_driver = {
 106         .driver_features = DRIVER_HAVE_IRQ | DRIVER_MODESET |
 107             DRIVER_GEM | DRIVER_PRIME,
 108         .load = sti_drm_load,
 109         .gem_free_object = drm_gem_cma_free_object,
 110         .gem_vm_ops = &drm_gem_cma_vm_ops,
 111         .dumb_create = drm_gem_cma_dumb_create,
 112         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 113         .dumb_destroy = drm_gem_dumb_destroy,
 114         .fops = &sti_drm_driver_fops,
 115
 116         .get_vblank_counter = drm_vblank_count,
 117         .enable_vblank = sti_drm_crtc_enable_vblank,
 118         .disable_vblank = sti_drm_crtc_disable_vblank,
 119
 120         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 121         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 122         .gem_prime_export = sti_drm_gem_prime_export,
 123         .gem_prime_import = drm_gem_prime_import,
 124         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 125         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 126         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 127         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 128         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 129
 130         .name = DRIVER_NAME,
 131         .desc = DRIVER_DESC,
 132         .date = DRIVER_DATE,
 133         .major = DRIVER_MAJOR,
 134         .minor = DRIVER_MINOR,
 135 };
 136
 137 static int compare_of(struct device *dev, void *data)
 138 {
 139         return dev->of_node == data;
 140 }
 141
 142 static int sti_drm_bind(struct device *dev)
 143 {
 144         return drm_platform_init(&sti_drm_driver, to_platform_device(dev));
 145 }
 146
 147 static void sti_drm_unbind(struct device *dev)
 148 {
 149         drm_put_dev(dev_get_drvdata(dev));
 150 }
 151
 152 static const struct component_master_ops sti_drm_ops = {
 153         .bind = sti_drm_bind,
 154         .unbind = sti_drm_unbind,
 155 };
 156
 157 static int sti_drm_master_probe(struct platform_device *pdev)
 158 {
 159         struct device *dev = &pdev->dev;
 160         struct device_node *node = dev->parent->of_node;
 161         struct device_node *child_np;
 162         struct component_match *match = NULL;
 163
 164         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 165
 166         child_np = of_get_next_available_child(node, NULL);
 167
 168         while (child_np) {
 169                 component_match_add(dev, &match, compare_of, child_np);
 170                 of_node_put(child_np);
 171                 child_np = of_get_next_available_child(node, child_np);
 172         }
 173
 174         return component_master_add_with_match(dev, &sti_drm_ops, match);
 175 }
 176
 177 static int sti_drm_master_remove(struct platform_device *pdev)
 178 {
 179         component_master_del(&pdev->dev, &sti_drm_ops);
 180         return 0;
 181 }
 182
 183 static struct platform_driver sti_drm_master_driver = {
 184         .probe = sti_drm_master_probe,
 185         .remove = sti_drm_master_remove,
 186         .driver = {
 187                 .owner = THIS_MODULE,
 188                 .name = DRIVER_NAME "__master",
 189         },
 190 };
 191
 192 static int sti_drm_platform_probe(struct platform_device *pdev)
 193 {
 194         struct device *dev = &pdev->dev;
 195         struct device_node *node = dev->of_node;
 196         struct platform_device *master;
 197
 198         of_platform_populate(node, NULL, NULL, dev);
 199
 200         platform_driver_register(&sti_drm_master_driver);
 201         master = platform_device_register_resndata(dev,
 202                         DRIVER_NAME "__master", -1,
 203                         NULL, 0, NULL, 0);
 204         if (!master)
 205                 return -EINVAL;
 206
 207         platform_set_drvdata(pdev, master);
 208         return 0;
 209 }
 210
 211 static int sti_drm_platform_remove(struct platform_device *pdev)
 212 {
 213         struct platform_device *master = platform_get_drvdata(pdev);
 214
 215         of_platform_depopulate(&pdev->dev);
 216         platform_device_unregister(master);
 217         platform_driver_unregister(&sti_drm_master_driver);
 218         return 0;
 219 }
 220
 221 static const struct of_device_id sti_drm_dt_ids[] = {
 222         { .compatible = "st,sti-display-subsystem", },
 223         { /* end node */ },
 224 };
 225 MODULE_DEVICE_TABLE(of, sti_drm_dt_ids);
 226
 227 static struct platform_driver sti_drm_platform_driver = {
 228         .probe = sti_drm_platform_probe,
 229         .remove = sti_drm_platform_remove,
 230         .driver = {
 231                 .owner = THIS_MODULE,
 232                 .name = DRIVER_NAME,
 233                 .of_match_table = sti_drm_dt_ids,
 234         },
 235 };
 236
 237 module_platform_driver(sti_drm_platform_driver);
 238
 239 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
 240 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
 241 MODULE_LICENSE("GPL");