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 #include <linux/clk.h> 11 #include <linux/component.h> 12 #include <linux/device.h> 13 #include <linux/io.h> 14 #include <linux/module.h> 15 #include <linux/of_platform.h> 16 #include <linux/platform_device.h> 17 #include "drm_fb_cma_helper.h" 18 19 #include "vc4_drv.h" 20 #include "vc4_regs.h" 21 22 #define DRIVER_NAME "vc4" 23 #define DRIVER_DESC "Broadcom VC4 graphics" 24 #define DRIVER_DATE "20140616" 25 #define DRIVER_MAJOR 0 26 #define DRIVER_MINOR 0 27 #define DRIVER_PATCHLEVEL 0 28 29 /* Helper function for mapping the regs on a platform device. */ 30 void __iomem *vc4_ioremap_regs(struct platform_device *dev, int index) 31 { 32 struct resource *res; 33 void __iomem *map; 34 35 res = platform_get_resource(dev, IORESOURCE_MEM, index); 36 map = devm_ioremap_resource(&dev->dev, res); 37 if (IS_ERR(map)) { 38 DRM_ERROR("Failed to map registers: %ld\n", PTR_ERR(map)); 39 return map; 40 } 41 42 return map; 43 } 44 45 static void vc4_drm_preclose(struct drm_device *dev, struct drm_file *file) 46 { 47 struct drm_crtc *crtc; 48 49 list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) 50 vc4_cancel_page_flip(crtc, file); 51 } 52 53 static void vc4_lastclose(struct drm_device *dev) 54 { 55 struct vc4_dev *vc4 = to_vc4_dev(dev); 56 57 if (vc4->fbdev) 58 drm_fbdev_cma_restore_mode(vc4->fbdev); 59 } 60 61 static const struct file_operations vc4_drm_fops = { 62 .owner = THIS_MODULE, 63 .open = drm_open, 64 .release = drm_release, 65 .unlocked_ioctl = drm_ioctl, 66 .mmap = drm_gem_cma_mmap, 67 .poll = drm_poll, 68 .read = drm_read, 69 #ifdef CONFIG_COMPAT 70 .compat_ioctl = drm_compat_ioctl, 71 #endif 72 .llseek = noop_llseek, 73 }; 74 75 static const struct drm_ioctl_desc vc4_drm_ioctls[] = { 76 }; 77 78 static struct drm_driver vc4_drm_driver = { 79 .driver_features = (DRIVER_MODESET | 80 DRIVER_ATOMIC | 81 DRIVER_GEM | 82 DRIVER_PRIME), 83 .lastclose = vc4_lastclose, 84 .preclose = vc4_drm_preclose, 85 86 .enable_vblank = vc4_enable_vblank, 87 .disable_vblank = vc4_disable_vblank, 88 .get_vblank_counter = drm_vblank_count, 89 90 #if defined(CONFIG_DEBUG_FS) 91 .debugfs_init = vc4_debugfs_init, 92 .debugfs_cleanup = vc4_debugfs_cleanup, 93 #endif 94 95 .gem_free_object = drm_gem_cma_free_object, 96 .gem_vm_ops = &drm_gem_cma_vm_ops, 97 98 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 99 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 100 .gem_prime_import = drm_gem_prime_import, 101 .gem_prime_export = drm_gem_prime_export, 102 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 103 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 104 .gem_prime_vmap = drm_gem_cma_prime_vmap, 105 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 106 .gem_prime_mmap = drm_gem_cma_prime_mmap, 107 108 .dumb_create = vc4_dumb_create, 109 .dumb_map_offset = drm_gem_cma_dumb_map_offset, 110 .dumb_destroy = drm_gem_dumb_destroy, 111 112 .ioctls = vc4_drm_ioctls, 113 .num_ioctls = ARRAY_SIZE(vc4_drm_ioctls), 114 .fops = &vc4_drm_fops, 115 116 .name = DRIVER_NAME, 117 .desc = DRIVER_DESC, 118 .date = DRIVER_DATE, 119 .major = DRIVER_MAJOR, 120 .minor = DRIVER_MINOR, 121 .patchlevel = DRIVER_PATCHLEVEL, 122 }; 123 124 static int compare_dev(struct device *dev, void *data) 125 { 126 return dev == data; 127 } 128 129 static void vc4_match_add_drivers(struct device *dev, 130 struct component_match **match, 131 struct platform_driver *const *drivers, 132 int count) 133 { 134 int i; 135 136 for (i = 0; i < count; i++) { 137 struct device_driver *drv = &drivers[i]->driver; 138 struct device *p = NULL, *d; 139 140 while ((d = bus_find_device(&platform_bus_type, p, drv, 141 (void *)platform_bus_type.match))) { 142 put_device(p); 143 component_match_add(dev, match, compare_dev, d); 144 p = d; 145 } 146 put_device(p); 147 } 148 } 149 150 static int vc4_drm_bind(struct device *dev) 151 { 152 struct platform_device *pdev = to_platform_device(dev); 153 struct drm_device *drm; 154 struct drm_connector *connector; 155 struct vc4_dev *vc4; 156 int ret = 0; 157 158 dev->coherent_dma_mask = DMA_BIT_MASK(32); 159 160 vc4 = devm_kzalloc(dev, sizeof(*vc4), GFP_KERNEL); 161 if (!vc4) 162 return -ENOMEM; 163 164 drm = drm_dev_alloc(&vc4_drm_driver, dev); 165 if (!drm) 166 return -ENOMEM; 167 platform_set_drvdata(pdev, drm); 168 vc4->dev = drm; 169 drm->dev_private = vc4; 170 171 drm_dev_set_unique(drm, dev_name(dev)); 172 173 drm_mode_config_init(drm); 174 if (ret) 175 goto unref; 176 177 ret = component_bind_all(dev, drm); 178 if (ret) 179 goto unref; 180 181 ret = drm_dev_register(drm, 0); 182 if (ret < 0) 183 goto unbind_all; 184 185 /* Connector registration has to occur after DRM device 186 * registration, because it creates sysfs entries based on the 187 * DRM device. 188 */ 189 list_for_each_entry(connector, &drm->mode_config.connector_list, head) { 190 ret = drm_connector_register(connector); 191 if (ret) 192 goto unregister; 193 } 194 195 vc4_kms_load(drm); 196 197 return 0; 198 199 unregister: 200 drm_dev_unregister(drm); 201 unbind_all: 202 component_unbind_all(dev, drm); 203 unref: 204 drm_dev_unref(drm); 205 return ret; 206 } 207 208 static void vc4_drm_unbind(struct device *dev) 209 { 210 struct platform_device *pdev = to_platform_device(dev); 211 struct drm_device *drm = platform_get_drvdata(pdev); 212 struct vc4_dev *vc4 = to_vc4_dev(drm); 213 214 if (vc4->fbdev) 215 drm_fbdev_cma_fini(vc4->fbdev); 216 217 drm_mode_config_cleanup(drm); 218 219 drm_put_dev(drm); 220 } 221 222 static const struct component_master_ops vc4_drm_ops = { 223 .bind = vc4_drm_bind, 224 .unbind = vc4_drm_unbind, 225 }; 226 227 static struct platform_driver *const component_drivers[] = { 228 &vc4_hdmi_driver, 229 &vc4_crtc_driver, 230 &vc4_hvs_driver, 231 }; 232 233 static int vc4_platform_drm_probe(struct platform_device *pdev) 234 { 235 struct component_match *match = NULL; 236 struct device *dev = &pdev->dev; 237 238 vc4_match_add_drivers(dev, &match, 239 component_drivers, ARRAY_SIZE(component_drivers)); 240 241 return component_master_add_with_match(dev, &vc4_drm_ops, match); 242 } 243 244 static int vc4_platform_drm_remove(struct platform_device *pdev) 245 { 246 component_master_del(&pdev->dev, &vc4_drm_ops); 247 248 return 0; 249 } 250 251 static const struct of_device_id vc4_of_match[] = { 252 { .compatible = "brcm,bcm2835-vc4", }, 253 {}, 254 }; 255 MODULE_DEVICE_TABLE(of, vc4_of_match); 256 257 static struct platform_driver vc4_platform_driver = { 258 .probe = vc4_platform_drm_probe, 259 .remove = vc4_platform_drm_remove, 260 .driver = { 261 .name = "vc4-drm", 262 .owner = THIS_MODULE, 263 .of_match_table = vc4_of_match, 264 }, 265 }; 266 267 static int __init vc4_drm_register(void) 268 { 269 int i, ret; 270 271 for (i = 0; i < ARRAY_SIZE(component_drivers); i++) { 272 ret = platform_driver_register(component_drivers[i]); 273 if (ret) { 274 while (--i >= 0) 275 platform_driver_unregister(component_drivers[i]); 276 return ret; 277 } 278 } 279 return platform_driver_register(&vc4_platform_driver); 280 } 281 282 static void __exit vc4_drm_unregister(void) 283 { 284 int i; 285 286 for (i = ARRAY_SIZE(component_drivers) - 1; i >= 0; i--) 287 platform_driver_unregister(component_drivers[i]); 288 289 platform_driver_unregister(&vc4_platform_driver); 290 } 291 292 module_init(vc4_drm_register); 293 module_exit(vc4_drm_unregister); 294 295 MODULE_ALIAS("platform:vc4-drm"); 296 MODULE_DESCRIPTION("Broadcom VC4 DRM Driver"); 297 MODULE_AUTHOR("Eric Anholt <eric@anholt.net>"); 298 MODULE_LICENSE("GPL v2"); 299