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 * The V3D GPU includes a tiled render (composed of a bin and render 11 * pipelines), the TFU (texture formatting unit), and the CSD (compute 12 * shader dispatch). 13 */ 14 15 #include <linux/clk.h> 16 #include <linux/device.h> 17 #include <linux/dma-mapping.h> 18 #include <linux/io.h> 19 #include <linux/module.h> 20 #include <linux/of_platform.h> 21 #include <linux/platform_device.h> 22 #include <linux/pm_runtime.h> 23 #include <linux/reset.h> 24 25 #include <drm/drm_drv.h> 26 #include <drm/drm_fb_cma_helper.h> 27 #include <drm/drm_fb_helper.h> 28 #include <drm/drm_managed.h> 29 #include <uapi/drm/v3d_drm.h> 30 31 #include "v3d_drv.h" 32 #include "v3d_regs.h" 33 34 #define DRIVER_NAME "v3d" 35 #define DRIVER_DESC "Broadcom V3D graphics" 36 #define DRIVER_DATE "20180419" 37 #define DRIVER_MAJOR 1 38 #define DRIVER_MINOR 0 39 #define DRIVER_PATCHLEVEL 0 40 41 static int v3d_get_param_ioctl(struct drm_device *dev, void *data, 42 struct drm_file *file_priv) 43 { 44 struct v3d_dev *v3d = to_v3d_dev(dev); 45 struct drm_v3d_get_param *args = data; 46 int ret; 47 static const u32 reg_map[] = { 48 [DRM_V3D_PARAM_V3D_UIFCFG] = V3D_HUB_UIFCFG, 49 [DRM_V3D_PARAM_V3D_HUB_IDENT1] = V3D_HUB_IDENT1, 50 [DRM_V3D_PARAM_V3D_HUB_IDENT2] = V3D_HUB_IDENT2, 51 [DRM_V3D_PARAM_V3D_HUB_IDENT3] = V3D_HUB_IDENT3, 52 [DRM_V3D_PARAM_V3D_CORE0_IDENT0] = V3D_CTL_IDENT0, 53 [DRM_V3D_PARAM_V3D_CORE0_IDENT1] = V3D_CTL_IDENT1, 54 [DRM_V3D_PARAM_V3D_CORE0_IDENT2] = V3D_CTL_IDENT2, 55 }; 56 57 if (args->pad != 0) 58 return -EINVAL; 59 60 /* Note that DRM_V3D_PARAM_V3D_CORE0_IDENT0 is 0, so we need 61 * to explicitly allow it in the "the register in our 62 * parameter map" check. 63 */ 64 if (args->param < ARRAY_SIZE(reg_map) && 65 (reg_map[args->param] || 66 args->param == DRM_V3D_PARAM_V3D_CORE0_IDENT0)) { 67 u32 offset = reg_map[args->param]; 68 69 if (args->value != 0) 70 return -EINVAL; 71 72 ret = pm_runtime_get_sync(v3d->drm.dev); 73 if (ret < 0) 74 return ret; 75 if (args->param >= DRM_V3D_PARAM_V3D_CORE0_IDENT0 && 76 args->param <= DRM_V3D_PARAM_V3D_CORE0_IDENT2) { 77 args->value = V3D_CORE_READ(0, offset); 78 } else { 79 args->value = V3D_READ(offset); 80 } 81 pm_runtime_mark_last_busy(v3d->drm.dev); 82 pm_runtime_put_autosuspend(v3d->drm.dev); 83 return 0; 84 } 85 86 87 switch (args->param) { 88 case DRM_V3D_PARAM_SUPPORTS_TFU: 89 args->value = 1; 90 return 0; 91 case DRM_V3D_PARAM_SUPPORTS_CSD: 92 args->value = v3d_has_csd(v3d); 93 return 0; 94 case DRM_V3D_PARAM_SUPPORTS_CACHE_FLUSH: 95 args->value = 1; 96 return 0; 97 default: 98 DRM_DEBUG("Unknown parameter %d\n", args->param); 99 return -EINVAL; 100 } 101 } 102 103 static int 104 v3d_open(struct drm_device *dev, struct drm_file *file) 105 { 106 struct v3d_dev *v3d = to_v3d_dev(dev); 107 struct v3d_file_priv *v3d_priv; 108 struct drm_gpu_scheduler *sched; 109 int i; 110 111 v3d_priv = kzalloc(sizeof(*v3d_priv), GFP_KERNEL); 112 if (!v3d_priv) 113 return -ENOMEM; 114 115 v3d_priv->v3d = v3d; 116 117 for (i = 0; i < V3D_MAX_QUEUES; i++) { 118 sched = &v3d->queue[i].sched; 119 drm_sched_entity_init(&v3d_priv->sched_entity[i], 120 DRM_SCHED_PRIORITY_NORMAL, &sched, 121 1, NULL); 122 } 123 124 file->driver_priv = v3d_priv; 125 126 return 0; 127 } 128 129 static void 130 v3d_postclose(struct drm_device *dev, struct drm_file *file) 131 { 132 struct v3d_file_priv *v3d_priv = file->driver_priv; 133 enum v3d_queue q; 134 135 for (q = 0; q < V3D_MAX_QUEUES; q++) { 136 drm_sched_entity_destroy(&v3d_priv->sched_entity[q]); 137 } 138 139 kfree(v3d_priv); 140 } 141 142 DEFINE_DRM_GEM_FOPS(v3d_drm_fops); 143 144 /* DRM_AUTH is required on SUBMIT_CL for now, while we don't have GMP 145 * protection between clients. Note that render nodes would be be 146 * able to submit CLs that could access BOs from clients authenticated 147 * with the master node. The TFU doesn't use the GMP, so it would 148 * need to stay DRM_AUTH until we do buffer size/offset validation. 149 */ 150 static const struct drm_ioctl_desc v3d_drm_ioctls[] = { 151 DRM_IOCTL_DEF_DRV(V3D_SUBMIT_CL, v3d_submit_cl_ioctl, DRM_RENDER_ALLOW | DRM_AUTH), 152 DRM_IOCTL_DEF_DRV(V3D_WAIT_BO, v3d_wait_bo_ioctl, DRM_RENDER_ALLOW), 153 DRM_IOCTL_DEF_DRV(V3D_CREATE_BO, v3d_create_bo_ioctl, DRM_RENDER_ALLOW), 154 DRM_IOCTL_DEF_DRV(V3D_MMAP_BO, v3d_mmap_bo_ioctl, DRM_RENDER_ALLOW), 155 DRM_IOCTL_DEF_DRV(V3D_GET_PARAM, v3d_get_param_ioctl, DRM_RENDER_ALLOW), 156 DRM_IOCTL_DEF_DRV(V3D_GET_BO_OFFSET, v3d_get_bo_offset_ioctl, DRM_RENDER_ALLOW), 157 DRM_IOCTL_DEF_DRV(V3D_SUBMIT_TFU, v3d_submit_tfu_ioctl, DRM_RENDER_ALLOW | DRM_AUTH), 158 DRM_IOCTL_DEF_DRV(V3D_SUBMIT_CSD, v3d_submit_csd_ioctl, DRM_RENDER_ALLOW | DRM_AUTH), 159 }; 160 161 static const struct drm_driver v3d_drm_driver = { 162 .driver_features = (DRIVER_GEM | 163 DRIVER_RENDER | 164 DRIVER_SYNCOBJ), 165 166 .open = v3d_open, 167 .postclose = v3d_postclose, 168 169 #if defined(CONFIG_DEBUG_FS) 170 .debugfs_init = v3d_debugfs_init, 171 #endif 172 173 .gem_create_object = v3d_create_object, 174 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 175 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 176 .gem_prime_import_sg_table = v3d_prime_import_sg_table, 177 .gem_prime_mmap = drm_gem_prime_mmap, 178 179 .ioctls = v3d_drm_ioctls, 180 .num_ioctls = ARRAY_SIZE(v3d_drm_ioctls), 181 .fops = &v3d_drm_fops, 182 183 .name = DRIVER_NAME, 184 .desc = DRIVER_DESC, 185 .date = DRIVER_DATE, 186 .major = DRIVER_MAJOR, 187 .minor = DRIVER_MINOR, 188 .patchlevel = DRIVER_PATCHLEVEL, 189 }; 190 191 static const struct of_device_id v3d_of_match[] = { 192 { .compatible = "brcm,7268-v3d" }, 193 { .compatible = "brcm,7278-v3d" }, 194 {}, 195 }; 196 MODULE_DEVICE_TABLE(of, v3d_of_match); 197 198 static int 199 map_regs(struct v3d_dev *v3d, void __iomem **regs, const char *name) 200 { 201 struct resource *res = 202 platform_get_resource_byname(v3d_to_pdev(v3d), IORESOURCE_MEM, name); 203 204 *regs = devm_ioremap_resource(v3d->drm.dev, res); 205 return PTR_ERR_OR_ZERO(*regs); 206 } 207 208 static int v3d_platform_drm_probe(struct platform_device *pdev) 209 { 210 struct device *dev = &pdev->dev; 211 struct drm_device *drm; 212 struct v3d_dev *v3d; 213 int ret; 214 u32 mmu_debug; 215 u32 ident1; 216 217 218 v3d = devm_drm_dev_alloc(dev, &v3d_drm_driver, struct v3d_dev, drm); 219 if (IS_ERR(v3d)) 220 return PTR_ERR(v3d); 221 222 drm = &v3d->drm; 223 224 platform_set_drvdata(pdev, drm); 225 226 ret = map_regs(v3d, &v3d->hub_regs, "hub"); 227 if (ret) 228 return ret; 229 230 ret = map_regs(v3d, &v3d->core_regs[0], "core0"); 231 if (ret) 232 return ret; 233 234 mmu_debug = V3D_READ(V3D_MMU_DEBUG_INFO); 235 dma_set_mask_and_coherent(dev, 236 DMA_BIT_MASK(30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_PA_WIDTH))); 237 v3d->va_width = 30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_VA_WIDTH); 238 239 ident1 = V3D_READ(V3D_HUB_IDENT1); 240 v3d->ver = (V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_TVER) * 10 + 241 V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_REV)); 242 v3d->cores = V3D_GET_FIELD(ident1, V3D_HUB_IDENT1_NCORES); 243 WARN_ON(v3d->cores > 1); /* multicore not yet implemented */ 244 245 v3d->reset = devm_reset_control_get_exclusive(dev, NULL); 246 if (IS_ERR(v3d->reset)) { 247 ret = PTR_ERR(v3d->reset); 248 249 if (ret == -EPROBE_DEFER) 250 return ret; 251 252 v3d->reset = NULL; 253 ret = map_regs(v3d, &v3d->bridge_regs, "bridge"); 254 if (ret) { 255 dev_err(dev, 256 "Failed to get reset control or bridge regs\n"); 257 return ret; 258 } 259 } 260 261 if (v3d->ver < 41) { 262 ret = map_regs(v3d, &v3d->gca_regs, "gca"); 263 if (ret) 264 return ret; 265 } 266 267 v3d->mmu_scratch = dma_alloc_wc(dev, 4096, &v3d->mmu_scratch_paddr, 268 GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO); 269 if (!v3d->mmu_scratch) { 270 dev_err(dev, "Failed to allocate MMU scratch page\n"); 271 return -ENOMEM; 272 } 273 274 pm_runtime_use_autosuspend(dev); 275 pm_runtime_set_autosuspend_delay(dev, 50); 276 pm_runtime_enable(dev); 277 278 ret = v3d_gem_init(drm); 279 if (ret) 280 goto dma_free; 281 282 ret = v3d_irq_init(v3d); 283 if (ret) 284 goto gem_destroy; 285 286 ret = drm_dev_register(drm, 0); 287 if (ret) 288 goto irq_disable; 289 290 return 0; 291 292 irq_disable: 293 v3d_irq_disable(v3d); 294 gem_destroy: 295 v3d_gem_destroy(drm); 296 dma_free: 297 dma_free_wc(dev, 4096, v3d->mmu_scratch, v3d->mmu_scratch_paddr); 298 return ret; 299 } 300 301 static int v3d_platform_drm_remove(struct platform_device *pdev) 302 { 303 struct drm_device *drm = platform_get_drvdata(pdev); 304 struct v3d_dev *v3d = to_v3d_dev(drm); 305 306 drm_dev_unregister(drm); 307 308 v3d_gem_destroy(drm); 309 310 dma_free_wc(v3d->drm.dev, 4096, v3d->mmu_scratch, 311 v3d->mmu_scratch_paddr); 312 313 return 0; 314 } 315 316 static struct platform_driver v3d_platform_driver = { 317 .probe = v3d_platform_drm_probe, 318 .remove = v3d_platform_drm_remove, 319 .driver = { 320 .name = "v3d", 321 .of_match_table = v3d_of_match, 322 }, 323 }; 324 325 module_platform_driver(v3d_platform_driver); 326 327 MODULE_ALIAS("platform:v3d-drm"); 328 MODULE_DESCRIPTION("Broadcom V3D DRM Driver"); 329 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>"); 330 MODULE_LICENSE("GPL v2"); 331