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  * is supported.  The TFU (texture formatting unit) and V3D 4.x's CSD
  12  * (compute shader dispatch) are 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 <drm/drm_fb_cma_helper.h>
  23 #include <drm/drm_fb_helper.h>
  24
  25 #include "uapi/drm/v3d_drm.h"
  26 #include "v3d_drv.h"
  27 #include "v3d_regs.h"
  28
  29 #define DRIVER_NAME "v3d"
  30 #define DRIVER_DESC "Broadcom V3D graphics"
  31 #define DRIVER_DATE "20180419"
  32 #define DRIVER_MAJOR 1
  33 #define DRIVER_MINOR 0
  34 #define DRIVER_PATCHLEVEL 0
  35
  36 #ifdef CONFIG_PM
  37 static int v3d_runtime_suspend(struct device *dev)
  38 {
  39         struct drm_device *drm = dev_get_drvdata(dev);
  40         struct v3d_dev *v3d = to_v3d_dev(drm);
  41
  42         v3d_irq_disable(v3d);
  43
  44         clk_disable_unprepare(v3d->clk);
  45
  46         return 0;
  47 }
  48
  49 static int v3d_runtime_resume(struct device *dev)
  50 {
  51         struct drm_device *drm = dev_get_drvdata(dev);
  52         struct v3d_dev *v3d = to_v3d_dev(drm);
  53         int ret;
  54
  55         ret = clk_prepare_enable(v3d->clk);
  56         if (ret != 0)
  57                 return ret;
  58
  59         /* XXX: VPM base */
  60
  61         v3d_mmu_set_page_table(v3d);
  62         v3d_irq_enable(v3d);
  63
  64         return 0;
  65 }
  66 #endif
  67
  68 static const struct dev_pm_ops v3d_v3d_pm_ops = {
  69         SET_RUNTIME_PM_OPS(v3d_runtime_suspend, v3d_runtime_resume, NULL)
  70 };
  71
  72 static int v3d_get_param_ioctl(struct drm_device *dev, void *data,
  73                                struct drm_file *file_priv)
  74 {
  75         struct v3d_dev *v3d = to_v3d_dev(dev);
  76         struct drm_v3d_get_param *args = data;
  77         int ret;
  78         static const u32 reg_map[] = {
  79                 [DRM_V3D_PARAM_V3D_UIFCFG] = V3D_HUB_UIFCFG,
  80                 [DRM_V3D_PARAM_V3D_HUB_IDENT1] = V3D_HUB_IDENT1,
  81                 [DRM_V3D_PARAM_V3D_HUB_IDENT2] = V3D_HUB_IDENT2,
  82                 [DRM_V3D_PARAM_V3D_HUB_IDENT3] = V3D_HUB_IDENT3,
  83                 [DRM_V3D_PARAM_V3D_CORE0_IDENT0] = V3D_CTL_IDENT0,
  84                 [DRM_V3D_PARAM_V3D_CORE0_IDENT1] = V3D_CTL_IDENT1,
  85                 [DRM_V3D_PARAM_V3D_CORE0_IDENT2] = V3D_CTL_IDENT2,
  86         };
  87
  88         if (args->pad != 0)
  89                 return -EINVAL;
  90
  91         /* Note that DRM_V3D_PARAM_V3D_CORE0_IDENT0 is 0, so we need
  92          * to explicitly allow it in the "the register in our
  93          * parameter map" check.
  94          */
  95         if (args->param < ARRAY_SIZE(reg_map) &&
  96             (reg_map[args->param] ||
  97              args->param == DRM_V3D_PARAM_V3D_CORE0_IDENT0)) {
  98                 u32 offset = reg_map[args->param];
  99
 100                 if (args->value != 0)
 101                         return -EINVAL;
 102
 103                 ret = pm_runtime_get_sync(v3d->dev);
 104                 if (args->param >= DRM_V3D_PARAM_V3D_CORE0_IDENT0 &&
 105                     args->param <= DRM_V3D_PARAM_V3D_CORE0_IDENT2) {
 106                         args->value = V3D_CORE_READ(0, offset);
 107                 } else {
 108                         args->value = V3D_READ(offset);
 109                 }
 110                 pm_runtime_mark_last_busy(v3d->dev);
 111                 pm_runtime_put_autosuspend(v3d->dev);
 112                 return 0;
 113         }
 114
 115         /* Any params that aren't just register reads would go here. */
 116
 117         DRM_DEBUG("Unknown parameter %d\n", args->param);
 118         return -EINVAL;
 119 }
 120
 121 static int
 122 v3d_open(struct drm_device *dev, struct drm_file *file)
 123 {
 124         struct v3d_dev *v3d = to_v3d_dev(dev);
 125         struct v3d_file_priv *v3d_priv;
 126         int i;
 127
 128         v3d_priv = kzalloc(sizeof(*v3d_priv), GFP_KERNEL);
 129         if (!v3d_priv)
 130                 return -ENOMEM;
 131
 132         v3d_priv->v3d = v3d;
 133
 134         for (i = 0; i < V3D_MAX_QUEUES; i++) {
 135                 drm_sched_entity_init(&v3d->queue[i].sched,
 136                                       &v3d_priv->sched_entity[i],
 137                                       &v3d->queue[i].sched.sched_rq[DRM_SCHED_PRIORITY_NORMAL],
 138                                       NULL);
 139         }
 140
 141         file->driver_priv = v3d_priv;
 142
 143         return 0;
 144 }
 145
 146 static void
 147 v3d_postclose(struct drm_device *dev, struct drm_file *file)
 148 {
 149         struct v3d_dev *v3d = to_v3d_dev(dev);
 150         struct v3d_file_priv *v3d_priv = file->driver_priv;
 151         enum v3d_queue q;
 152
 153         for (q = 0; q < V3D_MAX_QUEUES; q++) {
 154                 drm_sched_entity_fini(&v3d->queue[q].sched,
 155                                       &v3d_priv->sched_entity[q]);
 156         }
 157
 158         kfree(v3d_priv);
 159 }
 160
 161 static const struct file_operations v3d_drm_fops = {
 162         .owner = THIS_MODULE,
 163         .open = drm_open,
 164         .release = drm_release,
 165         .unlocked_ioctl = drm_ioctl,
 166         .mmap = v3d_mmap,
 167         .poll = drm_poll,
 168         .read = drm_read,
 169         .compat_ioctl = drm_compat_ioctl,
 170         .llseek = noop_llseek,
 171 };
 172
 173 /* DRM_AUTH is required on SUBMIT_CL for now, while we don't have GMP
 174  * protection between clients.  Note that render nodes would be be
 175  * able to submit CLs that could access BOs from clients authenticated
 176  * with the master node.
 177  */
 178 static const struct drm_ioctl_desc v3d_drm_ioctls[] = {
 179         DRM_IOCTL_DEF_DRV(V3D_SUBMIT_CL, v3d_submit_cl_ioctl, DRM_RENDER_ALLOW | DRM_AUTH),
 180         DRM_IOCTL_DEF_DRV(V3D_WAIT_BO, v3d_wait_bo_ioctl, DRM_RENDER_ALLOW),
 181         DRM_IOCTL_DEF_DRV(V3D_CREATE_BO, v3d_create_bo_ioctl, DRM_RENDER_ALLOW),
 182         DRM_IOCTL_DEF_DRV(V3D_MMAP_BO, v3d_mmap_bo_ioctl, DRM_RENDER_ALLOW),
 183         DRM_IOCTL_DEF_DRV(V3D_GET_PARAM, v3d_get_param_ioctl, DRM_RENDER_ALLOW),
 184         DRM_IOCTL_DEF_DRV(V3D_GET_BO_OFFSET, v3d_get_bo_offset_ioctl, DRM_RENDER_ALLOW),
 185 };
 186
 187 static const struct vm_operations_struct v3d_vm_ops = {
 188         .fault = v3d_gem_fault,
 189         .open = drm_gem_vm_open,
 190         .close = drm_gem_vm_close,
 191 };
 192
 193 static struct drm_driver v3d_drm_driver = {
 194         .driver_features = (DRIVER_GEM |
 195                             DRIVER_RENDER |
 196                             DRIVER_PRIME |
 197                             DRIVER_SYNCOBJ),
 198
 199         .open = v3d_open,
 200         .postclose = v3d_postclose,
 201
 202 #if defined(CONFIG_DEBUG_FS)
 203         .debugfs_init = v3d_debugfs_init,
 204 #endif
 205
 206         .gem_free_object_unlocked = v3d_free_object,
 207         .gem_vm_ops = &v3d_vm_ops,
 208
 209         .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 210         .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 211         .gem_prime_import = drm_gem_prime_import,
 212         .gem_prime_export = drm_gem_prime_export,
 213         .gem_prime_res_obj = v3d_prime_res_obj,
 214         .gem_prime_get_sg_table = v3d_prime_get_sg_table,
 215         .gem_prime_import_sg_table = v3d_prime_import_sg_table,
 216         .gem_prime_mmap = v3d_prime_mmap,
 217
 218         .ioctls = v3d_drm_ioctls,
 219         .num_ioctls = ARRAY_SIZE(v3d_drm_ioctls),
 220         .fops = &v3d_drm_fops,
 221
 222         .name = DRIVER_NAME,
 223         .desc = DRIVER_DESC,
 224         .date = DRIVER_DATE,
 225         .major = DRIVER_MAJOR,
 226         .minor = DRIVER_MINOR,
 227         .patchlevel = DRIVER_PATCHLEVEL,
 228 };
 229
 230 static const struct of_device_id v3d_of_match[] = {
 231         { .compatible = "brcm,7268-v3d" },
 232         { .compatible = "brcm,7278-v3d" },
 233         {},
 234 };
 235 MODULE_DEVICE_TABLE(of, v3d_of_match);
 236
 237 static int
 238 map_regs(struct v3d_dev *v3d, void __iomem **regs, const char *name)
 239 {
 240         struct resource *res =
 241                 platform_get_resource_byname(v3d->pdev, IORESOURCE_MEM, name);
 242
 243         *regs = devm_ioremap_resource(v3d->dev, res);
 244         return PTR_ERR_OR_ZERO(*regs);
 245 }
 246
 247 static int v3d_platform_drm_probe(struct platform_device *pdev)
 248 {
 249         struct device *dev = &pdev->dev;
 250         struct drm_device *drm;
 251         struct v3d_dev *v3d;
 252         int ret;
 253         u32 ident1;
 254
 255         dev->coherent_dma_mask = DMA_BIT_MASK(36);
 256
 257         v3d = kzalloc(sizeof(*v3d), GFP_KERNEL);
 258         if (!v3d)
 259                 return -ENOMEM;
 260         v3d->dev = dev;
 261         v3d->pdev = pdev;
 262         drm = &v3d->drm;
 263
 264         ret = map_regs(v3d, &v3d->bridge_regs, "bridge");
 265         if (ret)
 266                 goto dev_free;
 267
 268         ret = map_regs(v3d, &v3d->hub_regs, "hub");
 269         if (ret)
 270                 goto dev_free;
 271
 272         ret = map_regs(v3d, &v3d->core_regs[0], "core0");
 273         if (ret)
 274                 goto dev_free;
 275
 276         ident1 = V3D_READ(V3D_HUB_IDENT1);
 277         v3d->ver = (V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_TVER) * 10 +
 278                     V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_REV));
 279         v3d->cores = V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_NCORES);
 280         WARN_ON(v3d->cores > 1); /* multicore not yet implemented */
 281
 282         if (v3d->ver < 41) {
 283                 ret = map_regs(v3d, &v3d->gca_regs, "gca");
 284                 if (ret)
 285                         goto dev_free;
 286         }
 287
 288         v3d->mmu_scratch = dma_alloc_wc(dev, 4096, &v3d->mmu_scratch_paddr,
 289                                         GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO);
 290         if (!v3d->mmu_scratch) {
 291                 dev_err(dev, "Failed to allocate MMU scratch page\n");
 292                 ret = -ENOMEM;
 293                 goto dev_free;
 294         }
 295
 296         pm_runtime_use_autosuspend(dev);
 297         pm_runtime_set_autosuspend_delay(dev, 50);
 298         pm_runtime_enable(dev);
 299
 300         ret = drm_dev_init(&v3d->drm, &v3d_drm_driver, dev);
 301         if (ret)
 302                 goto dma_free;
 303
 304         platform_set_drvdata(pdev, drm);
 305         drm->dev_private = v3d;
 306
 307         ret = v3d_gem_init(drm);
 308         if (ret)
 309                 goto dev_destroy;
 310
 311         v3d_irq_init(v3d);
 312
 313         ret = drm_dev_register(drm, 0);
 314         if (ret)
 315                 goto gem_destroy;
 316
 317         return 0;
 318
 319 gem_destroy:
 320         v3d_gem_destroy(drm);
 321 dev_destroy:
 322         drm_dev_put(drm);
 323 dma_free:
 324         dma_free_wc(dev, 4096, v3d->mmu_scratch, v3d->mmu_scratch_paddr);
 325 dev_free:
 326         kfree(v3d);
 327         return ret;
 328 }
 329
 330 static int v3d_platform_drm_remove(struct platform_device *pdev)
 331 {
 332         struct drm_device *drm = platform_get_drvdata(pdev);
 333         struct v3d_dev *v3d = to_v3d_dev(drm);
 334
 335         drm_dev_unregister(drm);
 336
 337         v3d_gem_destroy(drm);
 338
 339         drm_dev_put(drm);
 340
 341         dma_free_wc(v3d->dev, 4096, v3d->mmu_scratch, v3d->mmu_scratch_paddr);
 342
 343         return 0;
 344 }
 345
 346 static struct platform_driver v3d_platform_driver = {
 347         .probe          = v3d_platform_drm_probe,
 348         .remove         = v3d_platform_drm_remove,
 349         .driver         = {
 350                 .name   = "v3d",
 351                 .of_match_table = v3d_of_match,
 352         },
 353 };
 354
 355 static int __init v3d_drm_register(void)
 356 {
 357         return platform_driver_register(&v3d_platform_driver);
 358 }
 359
 360 static void __exit v3d_drm_unregister(void)
 361 {
 362         platform_driver_unregister(&v3d_platform_driver);
 363 }
 364
 365 module_init(v3d_drm_register);
 366 module_exit(v3d_drm_unregister);
 367
 368 MODULE_ALIAS("platform:v3d-drm");
 369 MODULE_DESCRIPTION("Broadcom V3D DRM Driver");
 370 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
 371 MODULE_LICENSE("GPL v2");