kernel/drivers/gpu/drm/vc4/vc4_drv.c

   1 /*
   2  * Copyright (C) 2014-2015 Broadcom
   3  * Copyright (C) 2013 Red Hat
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 #include <linux/clk.h>
  11 #include <linux/component.h>
  12 #include <linux/device.h>
  13 #include <linux/io.h>
  14 #include <linux/module.h>
  15 #include <linux/of_platform.h>
  16 #include <linux/platform_device.h>
  17 #include "drm_fb_cma_helper.h"
  18
  19 #include "vc4_drv.h"
  20 #include "vc4_regs.h"
  21
  22 #define DRIVER_NAME "vc4"
  23 #define DRIVER_DESC "Broadcom VC4 graphics"
  24 #define DRIVER_DATE "20140616"
  25 #define DRIVER_MAJOR 0
  26 #define DRIVER_MINOR 0
  27 #define DRIVER_PATCHLEVEL 0
  28
  29 /* Helper function for mapping the regs on a platform device. */
  30 void __iomem *vc4_ioremap_regs(struct platform_device *dev, int index)
  31 {
  32         struct resource *res;
  33         void __iomem *map;
  34
  35         res = platform_get_resource(dev, IORESOURCE_MEM, index);
  36         map = devm_ioremap_resource(&dev->dev, res);
  37         if (IS_ERR(map)) {
  38                 DRM_ERROR("Failed to map registers: %ld\n", PTR_ERR(map));
  39                 return map;
  40         }
  41
  42         return map;
  43 }
  44
  45 static void vc4_drm_preclose(struct drm_device *dev, struct drm_file *file)
  46 {
  47         struct drm_crtc *crtc;
  48
  49         list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
  50                 vc4_cancel_page_flip(crtc, file);
  51 }
  52
  53 static void vc4_lastclose(struct drm_device *dev)
  54 {
  55         struct vc4_dev *vc4 = to_vc4_dev(dev);
  56
  57         if (vc4->fbdev)
  58                 drm_fbdev_cma_restore_mode(vc4->fbdev);
  59 }
  60
  61 static const struct file_operations vc4_drm_fops = {
  62         .owner = THIS_MODULE,
  63         .open = drm_open,
  64         .release = drm_release,
  65         .unlocked_ioctl = drm_ioctl,
  66         .mmap = drm_gem_cma_mmap,
  67         .poll = drm_poll,
  68         .read = drm_read,
  69 #ifdef CONFIG_COMPAT
  70         .compat_ioctl = drm_compat_ioctl,
  71 #endif
  72         .llseek = noop_llseek,
  73 };
  74
  75 static const struct drm_ioctl_desc vc4_drm_ioctls[] = {
  76 };
  77
  78 static struct drm_driver vc4_drm_driver = {
  79         .driver_features = (DRIVER_MODESET |
  80                             DRIVER_ATOMIC |
  81                             DRIVER_GEM |
  82                             DRIVER_PRIME),
  83         .lastclose = vc4_lastclose,
  84         .preclose = vc4_drm_preclose,
  85
  86         .enable_vblank = vc4_enable_vblank,
  87         .disable_vblank = vc4_disable_vblank,
  88         .get_vblank_counter = drm_vblank_count,
  89
  90 #if defined(CONFIG_DEBUG_FS)
  91         .debugfs_init = vc4_debugfs_init,
  92         .debugfs_cleanup = vc4_debugfs_cleanup,
  93 #endif
  94
  95         .gem_free_object = drm_gem_cma_free_object,
  96         .gem_vm_ops = &drm_gem_cma_vm_ops,
  97
  98         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
  99         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 100         .gem_prime_import = drm_gem_prime_import,
 101         .gem_prime_export = drm_gem_prime_export,
 102         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 103         .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
 104         .gem_prime_vmap = drm_gem_cma_prime_vmap,
 105         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 106         .gem_prime_mmap = drm_gem_cma_prime_mmap,
 107
 108         .dumb_create = vc4_dumb_create,
 109         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 110         .dumb_destroy = drm_gem_dumb_destroy,
 111
 112         .ioctls = vc4_drm_ioctls,
 113         .num_ioctls = ARRAY_SIZE(vc4_drm_ioctls),
 114         .fops = &vc4_drm_fops,
 115
 116         .name = DRIVER_NAME,
 117         .desc = DRIVER_DESC,
 118         .date = DRIVER_DATE,
 119         .major = DRIVER_MAJOR,
 120         .minor = DRIVER_MINOR,
 121         .patchlevel = DRIVER_PATCHLEVEL,
 122 };
 123
 124 static int compare_dev(struct device *dev, void *data)
 125 {
 126         return dev == data;
 127 }
 128
 129 static void vc4_match_add_drivers(struct device *dev,
 130                                   struct component_match **match,
 131                                   struct platform_driver *const *drivers,
 132                                   int count)
 133 {
 134         int i;
 135
 136         for (i = 0; i < count; i++) {
 137                 struct device_driver *drv = &drivers[i]->driver;
 138                 struct device *p = NULL, *d;
 139
 140                 while ((d = bus_find_device(&platform_bus_type, p, drv,
 141                                             (void *)platform_bus_type.match))) {
 142                         put_device(p);
 143                         component_match_add(dev, match, compare_dev, d);
 144                         p = d;
 145                 }
 146                 put_device(p);
 147         }
 148 }
 149
 150 static int vc4_drm_bind(struct device *dev)
 151 {
 152         struct platform_device *pdev = to_platform_device(dev);
 153         struct drm_device *drm;
 154         struct drm_connector *connector;
 155         struct vc4_dev *vc4;
 156         int ret = 0;
 157
 158         dev->coherent_dma_mask = DMA_BIT_MASK(32);
 159
 160         vc4 = devm_kzalloc(dev, sizeof(*vc4), GFP_KERNEL);
 161         if (!vc4)
 162                 return -ENOMEM;
 163
 164         drm = drm_dev_alloc(&vc4_drm_driver, dev);
 165         if (!drm)
 166                 return -ENOMEM;
 167         platform_set_drvdata(pdev, drm);
 168         vc4->dev = drm;
 169         drm->dev_private = vc4;
 170
 171         drm_dev_set_unique(drm, dev_name(dev));
 172
 173         drm_mode_config_init(drm);
 174         if (ret)
 175                 goto unref;
 176
 177         ret = component_bind_all(dev, drm);
 178         if (ret)
 179                 goto unref;
 180
 181         ret = drm_dev_register(drm, 0);
 182         if (ret < 0)
 183                 goto unbind_all;
 184
 185         /* Connector registration has to occur after DRM device
 186          * registration, because it creates sysfs entries based on the
 187          * DRM device.
 188          */
 189         list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
 190                 ret = drm_connector_register(connector);
 191                 if (ret)
 192                         goto unregister;
 193         }
 194
 195         vc4_kms_load(drm);
 196
 197         return 0;
 198
 199 unregister:
 200         drm_dev_unregister(drm);
 201 unbind_all:
 202         component_unbind_all(dev, drm);
 203 unref:
 204         drm_dev_unref(drm);
 205         return ret;
 206 }
 207
 208 static void vc4_drm_unbind(struct device *dev)
 209 {
 210         struct platform_device *pdev = to_platform_device(dev);
 211         struct drm_device *drm = platform_get_drvdata(pdev);
 212         struct vc4_dev *vc4 = to_vc4_dev(drm);
 213
 214         if (vc4->fbdev)
 215                 drm_fbdev_cma_fini(vc4->fbdev);
 216
 217         drm_mode_config_cleanup(drm);
 218
 219         drm_put_dev(drm);
 220 }
 221
 222 static const struct component_master_ops vc4_drm_ops = {
 223         .bind = vc4_drm_bind,
 224         .unbind = vc4_drm_unbind,
 225 };
 226
 227 static struct platform_driver *const component_drivers[] = {
 228         &vc4_hdmi_driver,
 229         &vc4_crtc_driver,
 230         &vc4_hvs_driver,
 231 };
 232
 233 static int vc4_platform_drm_probe(struct platform_device *pdev)
 234 {
 235         struct component_match *match = NULL;
 236         struct device *dev = &pdev->dev;
 237
 238         vc4_match_add_drivers(dev, &match,
 239                               component_drivers, ARRAY_SIZE(component_drivers));
 240
 241         return component_master_add_with_match(dev, &vc4_drm_ops, match);
 242 }
 243
 244 static int vc4_platform_drm_remove(struct platform_device *pdev)
 245 {
 246         component_master_del(&pdev->dev, &vc4_drm_ops);
 247
 248         return 0;
 249 }
 250
 251 static const struct of_device_id vc4_of_match[] = {
 252         { .compatible = "brcm,bcm2835-vc4", },
 253         {},
 254 };
 255 MODULE_DEVICE_TABLE(of, vc4_of_match);
 256
 257 static struct platform_driver vc4_platform_driver = {
 258         .probe          = vc4_platform_drm_probe,
 259         .remove         = vc4_platform_drm_remove,
 260         .driver         = {
 261                 .name   = "vc4-drm",
 262                 .of_match_table = vc4_of_match,
 263         },
 264 };
 265
 266 static int __init vc4_drm_register(void)
 267 {
 268         int i, ret;
 269
 270         for (i = 0; i < ARRAY_SIZE(component_drivers); i++) {
 271                 ret = platform_driver_register(component_drivers[i]);
 272                 if (ret) {
 273                         while (--i >= 0)
 274                                 platform_driver_unregister(component_drivers[i]);
 275                         return ret;
 276                 }
 277         }
 278         return platform_driver_register(&vc4_platform_driver);
 279 }
 280
 281 static void __exit vc4_drm_unregister(void)
 282 {
 283         int i;
 284
 285         for (i = ARRAY_SIZE(component_drivers) - 1; i >= 0; i--)
 286                 platform_driver_unregister(component_drivers[i]);
 287
 288         platform_driver_unregister(&vc4_platform_driver);
 289 }
 290
 291 module_init(vc4_drm_register);
 292 module_exit(vc4_drm_unregister);
 293
 294 MODULE_ALIAS("platform:vc4-drm");
 295 MODULE_DESCRIPTION("Broadcom VC4 DRM Driver");
 296 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
 297 MODULE_LICENSE("GPL v2");