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/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 case DRM_VC4_PARAM_SUPPORTS_FIXED_RCL_ORDER: 103 case DRM_VC4_PARAM_SUPPORTS_MADVISE: 104 args->value = true; 105 break; 106 default: 107 DRM_DEBUG("Unknown parameter %d\n", args->param); 108 return -EINVAL; 109 } 110 111 return 0; 112 } 113 114 static void vc4_lastclose(struct drm_device *dev) 115 { 116 struct vc4_dev *vc4 = to_vc4_dev(dev); 117 118 drm_fbdev_cma_restore_mode(vc4->fbdev); 119 } 120 121 static const struct vm_operations_struct vc4_vm_ops = { 122 .fault = vc4_fault, 123 .open = drm_gem_vm_open, 124 .close = drm_gem_vm_close, 125 }; 126 127 static const struct file_operations vc4_drm_fops = { 128 .owner = THIS_MODULE, 129 .open = drm_open, 130 .release = drm_release, 131 .unlocked_ioctl = drm_ioctl, 132 .mmap = vc4_mmap, 133 .poll = drm_poll, 134 .read = drm_read, 135 .compat_ioctl = drm_compat_ioctl, 136 .llseek = noop_llseek, 137 }; 138 139 static const struct drm_ioctl_desc vc4_drm_ioctls[] = { 140 DRM_IOCTL_DEF_DRV(VC4_SUBMIT_CL, vc4_submit_cl_ioctl, DRM_RENDER_ALLOW), 141 DRM_IOCTL_DEF_DRV(VC4_WAIT_SEQNO, vc4_wait_seqno_ioctl, DRM_RENDER_ALLOW), 142 DRM_IOCTL_DEF_DRV(VC4_WAIT_BO, vc4_wait_bo_ioctl, DRM_RENDER_ALLOW), 143 DRM_IOCTL_DEF_DRV(VC4_CREATE_BO, vc4_create_bo_ioctl, DRM_RENDER_ALLOW), 144 DRM_IOCTL_DEF_DRV(VC4_MMAP_BO, vc4_mmap_bo_ioctl, DRM_RENDER_ALLOW), 145 DRM_IOCTL_DEF_DRV(VC4_CREATE_SHADER_BO, vc4_create_shader_bo_ioctl, DRM_RENDER_ALLOW), 146 DRM_IOCTL_DEF_DRV(VC4_GET_HANG_STATE, vc4_get_hang_state_ioctl, 147 DRM_ROOT_ONLY), 148 DRM_IOCTL_DEF_DRV(VC4_GET_PARAM, vc4_get_param_ioctl, DRM_RENDER_ALLOW), 149 DRM_IOCTL_DEF_DRV(VC4_SET_TILING, vc4_set_tiling_ioctl, DRM_RENDER_ALLOW), 150 DRM_IOCTL_DEF_DRV(VC4_GET_TILING, vc4_get_tiling_ioctl, DRM_RENDER_ALLOW), 151 DRM_IOCTL_DEF_DRV(VC4_LABEL_BO, vc4_label_bo_ioctl, DRM_RENDER_ALLOW), 152 DRM_IOCTL_DEF_DRV(VC4_GEM_MADVISE, vc4_gem_madvise_ioctl, DRM_RENDER_ALLOW), 153 }; 154 155 static struct drm_driver vc4_drm_driver = { 156 .driver_features = (DRIVER_MODESET | 157 DRIVER_ATOMIC | 158 DRIVER_GEM | 159 DRIVER_HAVE_IRQ | 160 DRIVER_RENDER | 161 DRIVER_PRIME), 162 .lastclose = vc4_lastclose, 163 .irq_handler = vc4_irq, 164 .irq_preinstall = vc4_irq_preinstall, 165 .irq_postinstall = vc4_irq_postinstall, 166 .irq_uninstall = vc4_irq_uninstall, 167 168 .get_scanout_position = vc4_crtc_get_scanoutpos, 169 .get_vblank_timestamp = drm_calc_vbltimestamp_from_scanoutpos, 170 171 #if defined(CONFIG_DEBUG_FS) 172 .debugfs_init = vc4_debugfs_init, 173 #endif 174 175 .gem_create_object = vc4_create_object, 176 .gem_free_object_unlocked = vc4_free_object, 177 .gem_vm_ops = &vc4_vm_ops, 178 179 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 180 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 181 .gem_prime_import = drm_gem_prime_import, 182 .gem_prime_export = vc4_prime_export, 183 .gem_prime_res_obj = vc4_prime_res_obj, 184 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 185 .gem_prime_import_sg_table = vc4_prime_import_sg_table, 186 .gem_prime_vmap = vc4_prime_vmap, 187 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 188 .gem_prime_mmap = vc4_prime_mmap, 189 190 .dumb_create = vc4_dumb_create, 191 192 .ioctls = vc4_drm_ioctls, 193 .num_ioctls = ARRAY_SIZE(vc4_drm_ioctls), 194 .fops = &vc4_drm_fops, 195 196 .name = DRIVER_NAME, 197 .desc = DRIVER_DESC, 198 .date = DRIVER_DATE, 199 .major = DRIVER_MAJOR, 200 .minor = DRIVER_MINOR, 201 .patchlevel = DRIVER_PATCHLEVEL, 202 }; 203 204 static int compare_dev(struct device *dev, void *data) 205 { 206 return dev == data; 207 } 208 209 static void vc4_match_add_drivers(struct device *dev, 210 struct component_match **match, 211 struct platform_driver *const *drivers, 212 int count) 213 { 214 int i; 215 216 for (i = 0; i < count; i++) { 217 struct device_driver *drv = &drivers[i]->driver; 218 struct device *p = NULL, *d; 219 220 while ((d = bus_find_device(&platform_bus_type, p, drv, 221 (void *)platform_bus_type.match))) { 222 put_device(p); 223 component_match_add(dev, match, compare_dev, d); 224 p = d; 225 } 226 put_device(p); 227 } 228 } 229 230 static void vc4_kick_out_firmware_fb(void) 231 { 232 struct apertures_struct *ap; 233 234 ap = alloc_apertures(1); 235 if (!ap) 236 return; 237 238 /* Since VC4 is a UMA device, the simplefb node may have been 239 * located anywhere in memory. 240 */ 241 ap->ranges[0].base = 0; 242 ap->ranges[0].size = ~0; 243 244 drm_fb_helper_remove_conflicting_framebuffers(ap, "vc4drmfb", false); 245 kfree(ap); 246 } 247 248 static int vc4_drm_bind(struct device *dev) 249 { 250 struct platform_device *pdev = to_platform_device(dev); 251 struct drm_device *drm; 252 struct vc4_dev *vc4; 253 int ret = 0; 254 255 dev->coherent_dma_mask = DMA_BIT_MASK(32); 256 257 vc4 = devm_kzalloc(dev, sizeof(*vc4), GFP_KERNEL); 258 if (!vc4) 259 return -ENOMEM; 260 261 drm = drm_dev_alloc(&vc4_drm_driver, dev); 262 if (IS_ERR(drm)) 263 return PTR_ERR(drm); 264 platform_set_drvdata(pdev, drm); 265 vc4->dev = drm; 266 drm->dev_private = vc4; 267 268 ret = vc4_bo_cache_init(drm); 269 if (ret) 270 goto dev_unref; 271 272 drm_mode_config_init(drm); 273 274 vc4_gem_init(drm); 275 276 ret = component_bind_all(dev, drm); 277 if (ret) 278 goto gem_destroy; 279 280 vc4_kick_out_firmware_fb(); 281 282 ret = drm_dev_register(drm, 0); 283 if (ret < 0) 284 goto unbind_all; 285 286 vc4_kms_load(drm); 287 288 return 0; 289 290 unbind_all: 291 component_unbind_all(dev, drm); 292 gem_destroy: 293 vc4_gem_destroy(drm); 294 vc4_bo_cache_destroy(drm); 295 dev_unref: 296 drm_dev_unref(drm); 297 return ret; 298 } 299 300 static void vc4_drm_unbind(struct device *dev) 301 { 302 struct platform_device *pdev = to_platform_device(dev); 303 struct drm_device *drm = platform_get_drvdata(pdev); 304 struct vc4_dev *vc4 = to_vc4_dev(drm); 305 306 drm_dev_unregister(drm); 307 308 if (vc4->fbdev) 309 drm_fbdev_cma_fini(vc4->fbdev); 310 311 drm_mode_config_cleanup(drm); 312 313 drm_dev_unref(drm); 314 } 315 316 static const struct component_master_ops vc4_drm_ops = { 317 .bind = vc4_drm_bind, 318 .unbind = vc4_drm_unbind, 319 }; 320 321 static struct platform_driver *const component_drivers[] = { 322 &vc4_hdmi_driver, 323 &vc4_vec_driver, 324 &vc4_dpi_driver, 325 &vc4_dsi_driver, 326 &vc4_hvs_driver, 327 &vc4_crtc_driver, 328 &vc4_v3d_driver, 329 }; 330 331 static int vc4_platform_drm_probe(struct platform_device *pdev) 332 { 333 struct component_match *match = NULL; 334 struct device *dev = &pdev->dev; 335 336 vc4_match_add_drivers(dev, &match, 337 component_drivers, ARRAY_SIZE(component_drivers)); 338 339 return component_master_add_with_match(dev, &vc4_drm_ops, match); 340 } 341 342 static int vc4_platform_drm_remove(struct platform_device *pdev) 343 { 344 component_master_del(&pdev->dev, &vc4_drm_ops); 345 346 return 0; 347 } 348 349 static const struct of_device_id vc4_of_match[] = { 350 { .compatible = "brcm,bcm2835-vc4", }, 351 { .compatible = "brcm,cygnus-vc4", }, 352 {}, 353 }; 354 MODULE_DEVICE_TABLE(of, vc4_of_match); 355 356 static struct platform_driver vc4_platform_driver = { 357 .probe = vc4_platform_drm_probe, 358 .remove = vc4_platform_drm_remove, 359 .driver = { 360 .name = "vc4-drm", 361 .of_match_table = vc4_of_match, 362 }, 363 }; 364 365 static int __init vc4_drm_register(void) 366 { 367 int ret; 368 369 ret = platform_register_drivers(component_drivers, 370 ARRAY_SIZE(component_drivers)); 371 if (ret) 372 return ret; 373 374 return platform_driver_register(&vc4_platform_driver); 375 } 376 377 static void __exit vc4_drm_unregister(void) 378 { 379 platform_unregister_drivers(component_drivers, 380 ARRAY_SIZE(component_drivers)); 381 platform_driver_unregister(&vc4_platform_driver); 382 } 383 384 module_init(vc4_drm_register); 385 module_exit(vc4_drm_unregister); 386 387 MODULE_ALIAS("platform:vc4-drm"); 388 MODULE_DESCRIPTION("Broadcom VC4 DRM Driver"); 389 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>"); 390 MODULE_LICENSE("GPL v2"); 391