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                 drm_kms_helper_poll_fini(dev);
  72                 drm_mode_config_cleanup(dev);
  73                 kfree(private);
  74                 return ret;
  75         }
  76
  77         drm_helper_disable_unused_functions(dev);
  78
  79 #ifdef CONFIG_DRM_STI_FBDEV
  80         drm_fbdev_cma_init(dev, 32,
  81                    dev->mode_config.num_crtc,
  82                    dev->mode_config.num_connector);
  83 #endif
  84         return 0;
  85 }
  86
  87 static const struct file_operations sti_drm_driver_fops = {
  88         .owner = THIS_MODULE,
  89         .open = drm_open,
  90         .mmap = drm_gem_cma_mmap,
  91         .poll = drm_poll,
  92         .read = drm_read,
  93         .unlocked_ioctl = drm_ioctl,
  94 #ifdef CONFIG_COMPAT
  95         .compat_ioctl = drm_compat_ioctl,
  96 #endif
  97         .release = drm_release,
  98 };
  99
 100 static struct dma_buf *sti_drm_gem_prime_export(struct drm_device *dev,
 101                                                 struct drm_gem_object *obj,
 102                                                 int flags)
 103 {
 104         /* we want to be able to write in mmapped buffer */
 105         flags |= O_RDWR;
 106         return drm_gem_prime_export(dev, obj, flags);
 107 }
 108
 109 static struct drm_driver sti_drm_driver = {
 110         .driver_features = DRIVER_HAVE_IRQ | DRIVER_MODESET |
 111             DRIVER_GEM | DRIVER_PRIME,
 112         .load = sti_drm_load,
 113         .gem_free_object = drm_gem_cma_free_object,
 114         .gem_vm_ops = &drm_gem_cma_vm_ops,
 115         .dumb_create = drm_gem_cma_dumb_create,
 116         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 117         .dumb_destroy = drm_gem_dumb_destroy,
 118         .fops = &sti_drm_driver_fops,
 119
 120         .get_vblank_counter = drm_vblank_count,
 121         .enable_vblank = sti_drm_crtc_enable_vblank,
 122         .disable_vblank = sti_drm_crtc_disable_vblank,
 123
 124         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 125         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 126         .gem_prime_export = sti_drm_gem_prime_export,
 127         .gem_prime_import = drm_gem_prime_import,
 128         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 129         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 130         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 131         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 132         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 133
 134         .name = DRIVER_NAME,
 135         .desc = DRIVER_DESC,
 136         .date = DRIVER_DATE,
 137         .major = DRIVER_MAJOR,
 138         .minor = DRIVER_MINOR,
 139 };
 140
 141 static int compare_of(struct device *dev, void *data)
 142 {
 143         return dev->of_node == data;
 144 }
 145
 146 static int sti_drm_bind(struct device *dev)
 147 {
 148         return drm_platform_init(&sti_drm_driver, to_platform_device(dev));
 149 }
 150
 151 static void sti_drm_unbind(struct device *dev)
 152 {
 153         drm_put_dev(dev_get_drvdata(dev));
 154 }
 155
 156 static const struct component_master_ops sti_drm_ops = {
 157         .bind = sti_drm_bind,
 158         .unbind = sti_drm_unbind,
 159 };
 160
 161 static int sti_drm_master_probe(struct platform_device *pdev)
 162 {
 163         struct device *dev = &pdev->dev;
 164         struct device_node *node = dev->parent->of_node;
 165         struct device_node *child_np;
 166         struct component_match *match = NULL;
 167
 168         dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
 169
 170         child_np = of_get_next_available_child(node, NULL);
 171
 172         while (child_np) {
 173                 component_match_add(dev, &match, compare_of, child_np);
 174                 of_node_put(child_np);
 175                 child_np = of_get_next_available_child(node, child_np);
 176         }
 177
 178         return component_master_add_with_match(dev, &sti_drm_ops, match);
 179 }
 180
 181 static int sti_drm_master_remove(struct platform_device *pdev)
 182 {
 183         component_master_del(&pdev->dev, &sti_drm_ops);
 184         return 0;
 185 }
 186
 187 static struct platform_driver sti_drm_master_driver = {
 188         .probe = sti_drm_master_probe,
 189         .remove = sti_drm_master_remove,
 190         .driver = {
 191                 .name = DRIVER_NAME "__master",
 192         },
 193 };
 194
 195 static int sti_drm_platform_probe(struct platform_device *pdev)
 196 {
 197         struct device *dev = &pdev->dev;
 198         struct device_node *node = dev->of_node;
 199         struct platform_device *master;
 200
 201         of_platform_populate(node, NULL, NULL, dev);
 202
 203         platform_driver_register(&sti_drm_master_driver);
 204         master = platform_device_register_resndata(dev,
 205                         DRIVER_NAME "__master", -1,
 206                         NULL, 0, NULL, 0);
 207         if (IS_ERR(master))
 208                return PTR_ERR(master);
 209
 210         platform_set_drvdata(pdev, master);
 211         return 0;
 212 }
 213
 214 static int sti_drm_platform_remove(struct platform_device *pdev)
 215 {
 216         struct platform_device *master = platform_get_drvdata(pdev);
 217
 218         of_platform_depopulate(&pdev->dev);
 219         platform_device_unregister(master);
 220         platform_driver_unregister(&sti_drm_master_driver);
 221         return 0;
 222 }
 223
 224 static const struct of_device_id sti_drm_dt_ids[] = {
 225         { .compatible = "st,sti-display-subsystem", },
 226         { /* end node */ },
 227 };
 228 MODULE_DEVICE_TABLE(of, sti_drm_dt_ids);
 229
 230 static struct platform_driver sti_drm_platform_driver = {
 231         .probe = sti_drm_platform_probe,
 232         .remove = sti_drm_platform_remove,
 233         .driver = {
 234                 .name = DRIVER_NAME,
 235                 .of_match_table = sti_drm_dt_ids,
 236         },
 237 };
 238
 239 module_platform_driver(sti_drm_platform_driver);
 240
 241 MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
 242 MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
 243 MODULE_LICENSE("GPL");