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