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