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