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 /**
  11  * DOC: Broadcom VC4 Graphics Driver
  12  *
  13  * The Broadcom VideoCore 4 (present in the Raspberry Pi) contains a
  14  * OpenGL ES 2.0-compatible 3D engine called V3D, and a highly
  15  * configurable display output pipeline that supports HDMI, DSI, DPI,
  16  * and Composite TV output.
  17  *
  18  * The 3D engine also has an interface for submitting arbitrary
  19  * compute shader-style jobs using the same shader processor as is
  20  * used for vertex and fragment shaders in GLES 2.0.  However, given
  21  * that the hardware isn't able to expose any standard interfaces like
  22  * OpenGL compute shaders or OpenCL, it isn't supported by this
  23  * driver.
  24  */
  25
  26 #include <linux/clk.h>
  27 #include <linux/component.h>
  28 #include <linux/device.h>
  29 #include <linux/io.h>
  30 #include <linux/module.h>
  31 #include <linux/of_platform.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/pm_runtime.h>
  34 #include "drm_fb_cma_helper.h"
  35 #include <drm/drm_fb_helper.h>
  36
  37 #include "uapi/drm/vc4_drm.h"
  38 #include "vc4_drv.h"
  39 #include "vc4_regs.h"
  40
  41 #define DRIVER_NAME "vc4"
  42 #define DRIVER_DESC "Broadcom VC4 graphics"
  43 #define DRIVER_DATE "20140616"
  44 #define DRIVER_MAJOR 0
  45 #define DRIVER_MINOR 0
  46 #define DRIVER_PATCHLEVEL 0
  47
  48 /* Helper function for mapping the regs on a platform device. */
  49 void __iomem *vc4_ioremap_regs(struct platform_device *dev, int index)
  50 {
  51         struct resource *res;
  52         void __iomem *map;
  53
  54         res = platform_get_resource(dev, IORESOURCE_MEM, index);
  55         map = devm_ioremap_resource(&dev->dev, res);
  56         if (IS_ERR(map)) {
  57                 DRM_ERROR("Failed to map registers: %ld\n", PTR_ERR(map));
  58                 return map;
  59         }
  60
  61         return map;
  62 }
  63
  64 static int vc4_get_param_ioctl(struct drm_device *dev, void *data,
  65                                struct drm_file *file_priv)
  66 {
  67         struct vc4_dev *vc4 = to_vc4_dev(dev);
  68         struct drm_vc4_get_param *args = data;
  69         int ret;
  70
  71         if (args->pad != 0)
  72                 return -EINVAL;
  73
  74         switch (args->param) {
  75         case DRM_VC4_PARAM_V3D_IDENT0:
  76                 ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);
  77                 if (ret < 0)
  78                         return ret;
  79                 args->value = V3D_READ(V3D_IDENT0);
  80                 pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev);
  81                 pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev);
  82                 break;
  83         case DRM_VC4_PARAM_V3D_IDENT1:
  84                 ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);
  85                 if (ret < 0)
  86                         return ret;
  87                 args->value = V3D_READ(V3D_IDENT1);
  88                 pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev);
  89                 pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev);
  90                 break;
  91         case DRM_VC4_PARAM_V3D_IDENT2:
  92                 ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);
  93                 if (ret < 0)
  94                         return ret;
  95                 args->value = V3D_READ(V3D_IDENT2);
  96                 pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev);
  97                 pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev);
  98                 break;
  99         case DRM_VC4_PARAM_SUPPORTS_BRANCHES:
 100         case DRM_VC4_PARAM_SUPPORTS_ETC1:
 101         case DRM_VC4_PARAM_SUPPORTS_THREADED_FS:
 102                 args->value = true;
 103                 break;
 104         default:
 105                 DRM_DEBUG("Unknown parameter %d\n", args->param);
 106                 return -EINVAL;
 107         }
 108
 109         return 0;
 110 }
 111
 112 static void vc4_lastclose(struct drm_device *dev)
 113 {
 114         struct vc4_dev *vc4 = to_vc4_dev(dev);
 115
 116         drm_fbdev_cma_restore_mode(vc4->fbdev);
 117 }
 118
 119 static const struct file_operations vc4_drm_fops = {
 120         .owner = THIS_MODULE,
 121         .open = drm_open,
 122         .release = drm_release,
 123         .unlocked_ioctl = drm_ioctl,
 124         .mmap = vc4_mmap,
 125         .poll = drm_poll,
 126         .read = drm_read,
 127         .compat_ioctl = drm_compat_ioctl,
 128         .llseek = noop_llseek,
 129 };
 130
 131 static const struct drm_ioctl_desc vc4_drm_ioctls[] = {
 132         DRM_IOCTL_DEF_DRV(VC4_SUBMIT_CL, vc4_submit_cl_ioctl, DRM_RENDER_ALLOW),
 133         DRM_IOCTL_DEF_DRV(VC4_WAIT_SEQNO, vc4_wait_seqno_ioctl, DRM_RENDER_ALLOW),
 134         DRM_IOCTL_DEF_DRV(VC4_WAIT_BO, vc4_wait_bo_ioctl, DRM_RENDER_ALLOW),
 135         DRM_IOCTL_DEF_DRV(VC4_CREATE_BO, vc4_create_bo_ioctl, DRM_RENDER_ALLOW),
 136         DRM_IOCTL_DEF_DRV(VC4_MMAP_BO, vc4_mmap_bo_ioctl, DRM_RENDER_ALLOW),
 137         DRM_IOCTL_DEF_DRV(VC4_CREATE_SHADER_BO, vc4_create_shader_bo_ioctl, DRM_RENDER_ALLOW),
 138         DRM_IOCTL_DEF_DRV(VC4_GET_HANG_STATE, vc4_get_hang_state_ioctl,
 139                           DRM_ROOT_ONLY),
 140         DRM_IOCTL_DEF_DRV(VC4_GET_PARAM, vc4_get_param_ioctl, DRM_RENDER_ALLOW),
 141 };
 142
 143 static struct drm_driver vc4_drm_driver = {
 144         .driver_features = (DRIVER_MODESET |
 145                             DRIVER_ATOMIC |
 146                             DRIVER_GEM |
 147                             DRIVER_HAVE_IRQ |
 148                             DRIVER_RENDER |
 149                             DRIVER_PRIME),
 150         .lastclose = vc4_lastclose,
 151         .irq_handler = vc4_irq,
 152         .irq_preinstall = vc4_irq_preinstall,
 153         .irq_postinstall = vc4_irq_postinstall,
 154         .irq_uninstall = vc4_irq_uninstall,
 155
 156         .get_scanout_position = vc4_crtc_get_scanoutpos,
 157         .get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos,
 158
 159 #if defined(CONFIG_DEBUG_FS)
 160         .debugfs_init = vc4_debugfs_init,
 161 #endif
 162
 163         .gem_create_object = vc4_create_object,
 164         .gem_free_object_unlocked = vc4_free_object,
 165         .gem_vm_ops = &drm_gem_cma_vm_ops,
 166
 167         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 168         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 169         .gem_prime_import = drm_gem_prime_import,
 170         .gem_prime_export = vc4_prime_export,
 171         .gem_prime_res_obj = vc4_prime_res_obj,
 172         .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
 173         .gem_prime_import_sg_table = vc4_prime_import_sg_table,
 174         .gem_prime_vmap = vc4_prime_vmap,
 175         .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
 176         .gem_prime_mmap = vc4_prime_mmap,
 177
 178         .dumb_create = vc4_dumb_create,
 179         .dumb_map_offset = drm_gem_cma_dumb_map_offset,
 180         .dumb_destroy = drm_gem_dumb_destroy,
 181
 182         .ioctls = vc4_drm_ioctls,
 183         .num_ioctls = ARRAY_SIZE(vc4_drm_ioctls),
 184         .fops = &vc4_drm_fops,
 185
 186         .name = DRIVER_NAME,
 187         .desc = DRIVER_DESC,
 188         .date = DRIVER_DATE,
 189         .major = DRIVER_MAJOR,
 190         .minor = DRIVER_MINOR,
 191         .patchlevel = DRIVER_PATCHLEVEL,
 192 };
 193
 194 static int compare_dev(struct device *dev, void *data)
 195 {
 196         return dev == data;
 197 }
 198
 199 static void vc4_match_add_drivers(struct device *dev,
 200                                   struct component_match **match,
 201                                   struct platform_driver *const *drivers,
 202                                   int count)
 203 {
 204         int i;
 205
 206         for (i = 0; i < count; i++) {
 207                 struct device_driver *drv = &drivers[i]->driver;
 208                 struct device *p = NULL, *d;
 209
 210                 while ((d = bus_find_device(&platform_bus_type, p, drv,
 211                                             (void *)platform_bus_type.match))) {
 212                         put_device(p);
 213                         component_match_add(dev, match, compare_dev, d);
 214                         p = d;
 215                 }
 216                 put_device(p);
 217         }
 218 }
 219
 220 static void vc4_kick_out_firmware_fb(void)
 221 {
 222         struct apertures_struct *ap;
 223
 224         ap = alloc_apertures(1);
 225         if (!ap)
 226                 return;
 227
 228         /* Since VC4 is a UMA device, the simplefb node may have been
 229          * located anywhere in memory.
 230          */
 231         ap->ranges[0].base = 0;
 232         ap->ranges[0].size = ~0;
 233
 234         drm_fb_helper_remove_conflicting_framebuffers(ap, "vc4drmfb", false);
 235         kfree(ap);
 236 }
 237
 238 static int vc4_drm_bind(struct device *dev)
 239 {
 240         struct platform_device *pdev = to_platform_device(dev);
 241         struct drm_device *drm;
 242         struct vc4_dev *vc4;
 243         int ret = 0;
 244
 245         dev->coherent_dma_mask = DMA_BIT_MASK(32);
 246
 247         vc4 = devm_kzalloc(dev, sizeof(*vc4), GFP_KERNEL);
 248         if (!vc4)
 249                 return -ENOMEM;
 250
 251         drm = drm_dev_alloc(&vc4_drm_driver, dev);
 252         if (IS_ERR(drm))
 253                 return PTR_ERR(drm);
 254         platform_set_drvdata(pdev, drm);
 255         vc4->dev = drm;
 256         drm->dev_private = vc4;
 257
 258         vc4_bo_cache_init(drm);
 259
 260         drm_mode_config_init(drm);
 261
 262         vc4_gem_init(drm);
 263
 264         ret = component_bind_all(dev, drm);
 265         if (ret)
 266                 goto gem_destroy;
 267
 268         vc4_kick_out_firmware_fb();
 269
 270         ret = drm_dev_register(drm, 0);
 271         if (ret < 0)
 272                 goto unbind_all;
 273
 274         vc4_kms_load(drm);
 275
 276         return 0;
 277
 278 unbind_all:
 279         component_unbind_all(dev, drm);
 280 gem_destroy:
 281         vc4_gem_destroy(drm);
 282         drm_dev_unref(drm);
 283         vc4_bo_cache_destroy(drm);
 284         return ret;
 285 }
 286
 287 static void vc4_drm_unbind(struct device *dev)
 288 {
 289         struct platform_device *pdev = to_platform_device(dev);
 290         struct drm_device *drm = platform_get_drvdata(pdev);
 291         struct vc4_dev *vc4 = to_vc4_dev(drm);
 292
 293         drm_dev_unregister(drm);
 294
 295         if (vc4->fbdev)
 296                 drm_fbdev_cma_fini(vc4->fbdev);
 297
 298         drm_mode_config_cleanup(drm);
 299
 300         drm_dev_unref(drm);
 301 }
 302
 303 static const struct component_master_ops vc4_drm_ops = {
 304         .bind = vc4_drm_bind,
 305         .unbind = vc4_drm_unbind,
 306 };
 307
 308 static struct platform_driver *const component_drivers[] = {
 309         &vc4_hdmi_driver,
 310         &vc4_vec_driver,
 311         &vc4_dpi_driver,
 312         &vc4_dsi_driver,
 313         &vc4_hvs_driver,
 314         &vc4_crtc_driver,
 315         &vc4_v3d_driver,
 316 };
 317
 318 static int vc4_platform_drm_probe(struct platform_device *pdev)
 319 {
 320         struct component_match *match = NULL;
 321         struct device *dev = &pdev->dev;
 322
 323         vc4_match_add_drivers(dev, &match,
 324                               component_drivers, ARRAY_SIZE(component_drivers));
 325
 326         return component_master_add_with_match(dev, &vc4_drm_ops, match);
 327 }
 328
 329 static int vc4_platform_drm_remove(struct platform_device *pdev)
 330 {
 331         component_master_del(&pdev->dev, &vc4_drm_ops);
 332
 333         return 0;
 334 }
 335
 336 static const struct of_device_id vc4_of_match[] = {
 337         { .compatible = "brcm,bcm2835-vc4", },
 338         { .compatible = "brcm,cygnus-vc4", },
 339         {},
 340 };
 341 MODULE_DEVICE_TABLE(of, vc4_of_match);
 342
 343 static struct platform_driver vc4_platform_driver = {
 344         .probe          = vc4_platform_drm_probe,
 345         .remove         = vc4_platform_drm_remove,
 346         .driver         = {
 347                 .name   = "vc4-drm",
 348                 .of_match_table = vc4_of_match,
 349         },
 350 };
 351
 352 static int __init vc4_drm_register(void)
 353 {
 354         int ret;
 355
 356         ret = platform_register_drivers(component_drivers,
 357                                         ARRAY_SIZE(component_drivers));
 358         if (ret)
 359                 return ret;
 360
 361         return platform_driver_register(&vc4_platform_driver);
 362 }
 363
 364 static void __exit vc4_drm_unregister(void)
 365 {
 366         platform_unregister_drivers(component_drivers,
 367                                     ARRAY_SIZE(component_drivers));
 368         platform_driver_unregister(&vc4_platform_driver);
 369 }
 370
 371 module_init(vc4_drm_register);
 372 module_exit(vc4_drm_unregister);
 373
 374 MODULE_ALIAS("platform:vc4-drm");
 375 MODULE_DESCRIPTION("Broadcom VC4 DRM Driver");
 376 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
 377 MODULE_LICENSE("GPL v2");