drivers/gpu/drm/v3d/v3d_drv.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /* Copyright (C) 2014-2018 Broadcom */
   3
   4 /**
   5  * DOC: Broadcom V3D Graphics Driver
   6  *
   7  * This driver supports the Broadcom V3D 3.3 and 4.1 OpenGL ES GPUs.
   8  * For V3D 2.x support, see the VC4 driver.
   9  *
  10  * Currently only single-core rendering using the binner and renderer,
  11  * along with TFU (texture formatting unit) rendering is supported.
  12  * V3D 4.x's CSD (compute shader dispatch) is not yet supported.
  13  */
  14
  15 #include <linux/clk.h>
  16 #include <linux/device.h>
  17 #include <linux/io.h>
  18 #include <linux/module.h>
  19 #include <linux/of_platform.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/pm_runtime.h>
  22 #include <linux/reset.h>
  23 #include <drm/drm_fb_cma_helper.h>
  24 #include <drm/drm_fb_helper.h>
  25
  26 #include "uapi/drm/v3d_drm.h"
  27 #include "v3d_drv.h"
  28 #include "v3d_regs.h"
  29
  30 #define DRIVER_NAME "v3d"
  31 #define DRIVER_DESC "Broadcom V3D graphics"
  32 #define DRIVER_DATE "20180419"
  33 #define DRIVER_MAJOR 1
  34 #define DRIVER_MINOR 0
  35 #define DRIVER_PATCHLEVEL 0
  36
  37 #ifdef CONFIG_PM
  38 static int v3d_runtime_suspend(struct device *dev)
  39 {
  40         struct drm_device *drm = dev_get_drvdata(dev);
  41         struct v3d_dev *v3d = to_v3d_dev(drm);
  42
  43         v3d_irq_disable(v3d);
  44
  45         clk_disable_unprepare(v3d->clk);
  46
  47         return 0;
  48 }
  49
  50 static int v3d_runtime_resume(struct device *dev)
  51 {
  52         struct drm_device *drm = dev_get_drvdata(dev);
  53         struct v3d_dev *v3d = to_v3d_dev(drm);
  54         int ret;
  55
  56         ret = clk_prepare_enable(v3d->clk);
  57         if (ret != 0)
  58                 return ret;
  59
  60         /* XXX: VPM base */
  61
  62         v3d_mmu_set_page_table(v3d);
  63         v3d_irq_enable(v3d);
  64
  65         return 0;
  66 }
  67 #endif
  68
  69 static const struct dev_pm_ops v3d_v3d_pm_ops = {
  70         SET_RUNTIME_PM_OPS(v3d_runtime_suspend, v3d_runtime_resume, NULL)
  71 };
  72
  73 static int v3d_get_param_ioctl(struct drm_device *dev, void *data,
  74                                struct drm_file *file_priv)
  75 {
  76         struct v3d_dev *v3d = to_v3d_dev(dev);
  77         struct drm_v3d_get_param *args = data;
  78         int ret;
  79         static const u32 reg_map[] = {
  80                 [DRM_V3D_PARAM_V3D_UIFCFG] = V3D_HUB_UIFCFG,
  81                 [DRM_V3D_PARAM_V3D_HUB_IDENT1] = V3D_HUB_IDENT1,
  82                 [DRM_V3D_PARAM_V3D_HUB_IDENT2] = V3D_HUB_IDENT2,
  83                 [DRM_V3D_PARAM_V3D_HUB_IDENT3] = V3D_HUB_IDENT3,
  84                 [DRM_V3D_PARAM_V3D_CORE0_IDENT0] = V3D_CTL_IDENT0,
  85                 [DRM_V3D_PARAM_V3D_CORE0_IDENT1] = V3D_CTL_IDENT1,
  86                 [DRM_V3D_PARAM_V3D_CORE0_IDENT2] = V3D_CTL_IDENT2,
  87         };
  88
  89         if (args->pad != 0)
  90                 return -EINVAL;
  91
  92         /* Note that DRM_V3D_PARAM_V3D_CORE0_IDENT0 is 0, so we need
  93          * to explicitly allow it in the "the register in our
  94          * parameter map" check.
  95          */
  96         if (args->param < ARRAY_SIZE(reg_map) &&
  97             (reg_map[args->param] ||
  98              args->param == DRM_V3D_PARAM_V3D_CORE0_IDENT0)) {
  99                 u32 offset = reg_map[args->param];
 100
 101                 if (args->value != 0)
 102                         return -EINVAL;
 103
 104                 ret = pm_runtime_get_sync(v3d->dev);
 105                 if (ret < 0)
 106                         return ret;
 107                 if (args->param >= DRM_V3D_PARAM_V3D_CORE0_IDENT0 &&
 108                     args->param <= DRM_V3D_PARAM_V3D_CORE0_IDENT2) {
 109                         args->value = V3D_CORE_READ(0, offset);
 110                 } else {
 111                         args->value = V3D_READ(offset);
 112                 }
 113                 pm_runtime_mark_last_busy(v3d->dev);
 114                 pm_runtime_put_autosuspend(v3d->dev);
 115                 return 0;
 116         }
 117
 118
 119         switch (args->param) {
 120         case DRM_V3D_PARAM_SUPPORTS_TFU:
 121                 args->value = 1;
 122                 return 0;
 123         default:
 124                 DRM_DEBUG("Unknown parameter %d\n", args->param);
 125                 return -EINVAL;
 126         }
 127 }
 128
 129 static int
 130 v3d_open(struct drm_device *dev, struct drm_file *file)
 131 {
 132         struct v3d_dev *v3d = to_v3d_dev(dev);
 133         struct v3d_file_priv *v3d_priv;
 134         struct drm_sched_rq *rq;
 135         int i;
 136
 137         v3d_priv = kzalloc(sizeof(*v3d_priv), GFP_KERNEL);
 138         if (!v3d_priv)
 139                 return -ENOMEM;
 140
 141         v3d_priv->v3d = v3d;
 142
 143         for (i = 0; i < V3D_MAX_QUEUES; i++) {
 144                 rq = &v3d->queue[i].sched.sched_rq[DRM_SCHED_PRIORITY_NORMAL];
 145                 drm_sched_entity_init(&v3d_priv->sched_entity[i], &rq, 1, NULL);
 146         }
 147
 148         file->driver_priv = v3d_priv;
 149
 150         return 0;
 151 }
 152
 153 static void
 154 v3d_postclose(struct drm_device *dev, struct drm_file *file)
 155 {
 156         struct v3d_file_priv *v3d_priv = file->driver_priv;
 157         enum v3d_queue q;
 158
 159         for (q = 0; q < V3D_MAX_QUEUES; q++) {
 160                 drm_sched_entity_destroy(&v3d_priv->sched_entity[q]);
 161         }
 162
 163         kfree(v3d_priv);
 164 }
 165
 166 DEFINE_DRM_GEM_SHMEM_FOPS(v3d_drm_fops);
 167
 168 /* DRM_AUTH is required on SUBMIT_CL for now, while we don't have GMP
 169  * protection between clients.  Note that render nodes would be be
 170  * able to submit CLs that could access BOs from clients authenticated
 171  * with the master node.  The TFU doesn't use the GMP, so it would
 172  * need to stay DRM_AUTH until we do buffer size/offset validation.
 173  */
 174 static const struct drm_ioctl_desc v3d_drm_ioctls[] = {
 175         DRM_IOCTL_DEF_DRV(V3D_SUBMIT_CL, v3d_submit_cl_ioctl, DRM_RENDER_ALLOW | DRM_AUTH),
 176         DRM_IOCTL_DEF_DRV(V3D_WAIT_BO, v3d_wait_bo_ioctl, DRM_RENDER_ALLOW),
 177         DRM_IOCTL_DEF_DRV(V3D_CREATE_BO, v3d_create_bo_ioctl, DRM_RENDER_ALLOW),
 178         DRM_IOCTL_DEF_DRV(V3D_MMAP_BO, v3d_mmap_bo_ioctl, DRM_RENDER_ALLOW),
 179         DRM_IOCTL_DEF_DRV(V3D_GET_PARAM, v3d_get_param_ioctl, DRM_RENDER_ALLOW),
 180         DRM_IOCTL_DEF_DRV(V3D_GET_BO_OFFSET, v3d_get_bo_offset_ioctl, DRM_RENDER_ALLOW),
 181         DRM_IOCTL_DEF_DRV(V3D_SUBMIT_TFU, v3d_submit_tfu_ioctl, DRM_RENDER_ALLOW | DRM_AUTH),
 182 };
 183
 184 static struct drm_driver v3d_drm_driver = {
 185         .driver_features = (DRIVER_GEM |
 186                             DRIVER_RENDER |
 187                             DRIVER_PRIME |
 188                             DRIVER_SYNCOBJ),
 189
 190         .open = v3d_open,
 191         .postclose = v3d_postclose,
 192
 193 #if defined(CONFIG_DEBUG_FS)
 194         .debugfs_init = v3d_debugfs_init,
 195 #endif
 196
 197         .gem_create_object = v3d_create_object,
 198         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 199         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 200         .gem_prime_import_sg_table = v3d_prime_import_sg_table,
 201         .gem_prime_mmap = drm_gem_prime_mmap,
 202
 203         .ioctls = v3d_drm_ioctls,
 204         .num_ioctls = ARRAY_SIZE(v3d_drm_ioctls),
 205         .fops = &v3d_drm_fops,
 206
 207         .name = DRIVER_NAME,
 208         .desc = DRIVER_DESC,
 209         .date = DRIVER_DATE,
 210         .major = DRIVER_MAJOR,
 211         .minor = DRIVER_MINOR,
 212         .patchlevel = DRIVER_PATCHLEVEL,
 213 };
 214
 215 static const struct of_device_id v3d_of_match[] = {
 216         { .compatible = "brcm,7268-v3d" },
 217         { .compatible = "brcm,7278-v3d" },
 218         {},
 219 };
 220 MODULE_DEVICE_TABLE(of, v3d_of_match);
 221
 222 static int
 223 map_regs(struct v3d_dev *v3d, void __iomem **regs, const char *name)
 224 {
 225         struct resource *res =
 226                 platform_get_resource_byname(v3d->pdev, IORESOURCE_MEM, name);
 227
 228         *regs = devm_ioremap_resource(v3d->dev, res);
 229         return PTR_ERR_OR_ZERO(*regs);
 230 }
 231
 232 static int v3d_platform_drm_probe(struct platform_device *pdev)
 233 {
 234         struct device *dev = &pdev->dev;
 235         struct drm_device *drm;
 236         struct v3d_dev *v3d;
 237         int ret;
 238         u32 ident1;
 239
 240         dev->coherent_dma_mask = DMA_BIT_MASK(36);
 241
 242         v3d = kzalloc(sizeof(*v3d), GFP_KERNEL);
 243         if (!v3d)
 244                 return -ENOMEM;
 245         v3d->dev = dev;
 246         v3d->pdev = pdev;
 247         drm = &v3d->drm;
 248
 249         ret = map_regs(v3d, &v3d->hub_regs, "hub");
 250         if (ret)
 251                 goto dev_free;
 252
 253         ret = map_regs(v3d, &v3d->core_regs[0], "core0");
 254         if (ret)
 255                 goto dev_free;
 256
 257         ident1 = V3D_READ(V3D_HUB_IDENT1);
 258         v3d->ver = (V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_TVER) * 10 +
 259                     V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_REV));
 260         v3d->cores = V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_NCORES);
 261         WARN_ON(v3d->cores > 1); /* multicore not yet implemented */
 262
 263         v3d->reset = devm_reset_control_get_exclusive(dev, NULL);
 264         if (IS_ERR(v3d->reset)) {
 265                 ret = PTR_ERR(v3d->reset);
 266
 267                 if (ret == -EPROBE_DEFER)
 268                         goto dev_free;
 269
 270                 v3d->reset = NULL;
 271                 ret = map_regs(v3d, &v3d->bridge_regs, "bridge");
 272                 if (ret) {
 273                         dev_err(dev,
 274                                 "Failed to get reset control or bridge regs\n");
 275                         goto dev_free;
 276                 }
 277         }
 278
 279         if (v3d->ver < 41) {
 280                 ret = map_regs(v3d, &v3d->gca_regs, "gca");
 281                 if (ret)
 282                         goto dev_free;
 283         }
 284
 285         v3d->mmu_scratch = dma_alloc_wc(dev, 4096, &v3d->mmu_scratch_paddr,
 286                                         GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO);
 287         if (!v3d->mmu_scratch) {
 288                 dev_err(dev, "Failed to allocate MMU scratch page\n");
 289                 ret = -ENOMEM;
 290                 goto dev_free;
 291         }
 292
 293         pm_runtime_use_autosuspend(dev);
 294         pm_runtime_set_autosuspend_delay(dev, 50);
 295         pm_runtime_enable(dev);
 296
 297         ret = drm_dev_init(&v3d->drm, &v3d_drm_driver, dev);
 298         if (ret)
 299                 goto dma_free;
 300
 301         platform_set_drvdata(pdev, drm);
 302         drm->dev_private = v3d;
 303
 304         ret = v3d_gem_init(drm);
 305         if (ret)
 306                 goto dev_destroy;
 307
 308         ret = v3d_irq_init(v3d);
 309         if (ret)
 310                 goto gem_destroy;
 311
 312         ret = drm_dev_register(drm, 0);
 313         if (ret)
 314                 goto irq_disable;
 315
 316         return 0;
 317
 318 irq_disable:
 319         v3d_irq_disable(v3d);
 320 gem_destroy:
 321         v3d_gem_destroy(drm);
 322 dev_destroy:
 323         drm_dev_put(drm);
 324 dma_free:
 325         dma_free_wc(dev, 4096, v3d->mmu_scratch, v3d->mmu_scratch_paddr);
 326 dev_free:
 327         kfree(v3d);
 328         return ret;
 329 }
 330
 331 static int v3d_platform_drm_remove(struct platform_device *pdev)
 332 {
 333         struct drm_device *drm = platform_get_drvdata(pdev);
 334         struct v3d_dev *v3d = to_v3d_dev(drm);
 335
 336         drm_dev_unregister(drm);
 337
 338         v3d_gem_destroy(drm);
 339
 340         drm_dev_put(drm);
 341
 342         dma_free_wc(v3d->dev, 4096, v3d->mmu_scratch, v3d->mmu_scratch_paddr);
 343
 344         return 0;
 345 }
 346
 347 static struct platform_driver v3d_platform_driver = {
 348         .probe          = v3d_platform_drm_probe,
 349         .remove         = v3d_platform_drm_remove,
 350         .driver         = {
 351                 .name   = "v3d",
 352                 .of_match_table = v3d_of_match,
 353         },
 354 };
 355
 356 static int __init v3d_drm_register(void)
 357 {
 358         return platform_driver_register(&v3d_platform_driver);
 359 }
 360
 361 static void __exit v3d_drm_unregister(void)
 362 {
 363         platform_driver_unregister(&v3d_platform_driver);
 364 }
 365
 366 module_init(v3d_drm_register);
 367 module_exit(v3d_drm_unregister);
 368
 369 MODULE_ALIAS("platform:v3d-drm");
 370 MODULE_DESCRIPTION("Broadcom V3D DRM Driver");
 371 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
 372 MODULE_LICENSE("GPL v2");