1 /* 2 * Copyright 2015 Freescale Semiconductor, Inc. 3 * 4 * Freescale DCU drm device driver 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12 #include <linux/clk.h> 13 #include <linux/clk-provider.h> 14 #include <linux/io.h> 15 #include <linux/mfd/syscon.h> 16 #include <linux/mm.h> 17 #include <linux/module.h> 18 #include <linux/of_platform.h> 19 #include <linux/platform_device.h> 20 #include <linux/pm.h> 21 #include <linux/pm_runtime.h> 22 #include <linux/regmap.h> 23 24 #include <drm/drmP.h> 25 #include <drm/drm_crtc_helper.h> 26 #include <drm/drm_gem_cma_helper.h> 27 28 #include "fsl_dcu_drm_crtc.h" 29 #include "fsl_dcu_drm_drv.h" 30 31 static const struct regmap_config fsl_dcu_regmap_config = { 32 .reg_bits = 32, 33 .reg_stride = 4, 34 .val_bits = 32, 35 .cache_type = REGCACHE_RBTREE, 36 }; 37 38 static int fsl_dcu_drm_irq_init(struct drm_device *dev) 39 { 40 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private; 41 unsigned int value; 42 int ret; 43 44 ret = drm_irq_install(dev, fsl_dev->irq); 45 if (ret < 0) 46 dev_err(dev->dev, "failed to install IRQ handler\n"); 47 48 ret = regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0); 49 if (ret) 50 dev_err(dev->dev, "set DCU_INT_STATUS failed\n"); 51 ret = regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value); 52 if (ret) 53 dev_err(dev->dev, "read DCU_INT_MASK failed\n"); 54 value &= DCU_INT_MASK_VBLANK; 55 ret = regmap_write(fsl_dev->regmap, DCU_INT_MASK, value); 56 if (ret) 57 dev_err(dev->dev, "set DCU_INT_MASK failed\n"); 58 ret = regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE, 59 DCU_UPDATE_MODE_READREG); 60 if (ret) 61 dev_err(dev->dev, "set DCU_UPDATE_MODE failed\n"); 62 63 return ret; 64 } 65 66 static int fsl_dcu_load(struct drm_device *drm, unsigned long flags) 67 { 68 struct device *dev = drm->dev; 69 struct fsl_dcu_drm_device *fsl_dev = drm->dev_private; 70 int ret; 71 72 ret = fsl_dcu_drm_modeset_init(fsl_dev); 73 if (ret < 0) { 74 dev_err(dev, "failed to initialize mode setting\n"); 75 return ret; 76 } 77 78 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 79 if (ret < 0) { 80 dev_err(dev, "failed to initialize vblank\n"); 81 goto done; 82 } 83 drm->vblank_disable_allowed = true; 84 85 ret = fsl_dcu_drm_irq_init(drm); 86 if (ret < 0) 87 goto done; 88 drm->irq_enabled = true; 89 90 fsl_dcu_fbdev_init(drm); 91 92 return 0; 93 done: 94 if (ret) { 95 drm_mode_config_cleanup(drm); 96 drm_vblank_cleanup(drm); 97 drm_irq_uninstall(drm); 98 drm->dev_private = NULL; 99 } 100 101 return ret; 102 } 103 104 static int fsl_dcu_unload(struct drm_device *dev) 105 { 106 drm_mode_config_cleanup(dev); 107 drm_vblank_cleanup(dev); 108 drm_irq_uninstall(dev); 109 110 dev->dev_private = NULL; 111 112 return 0; 113 } 114 115 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg) 116 { 117 struct drm_device *dev = arg; 118 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private; 119 unsigned int int_status; 120 int ret; 121 122 ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status); 123 if (ret) 124 dev_err(dev->dev, "set DCU_INT_STATUS failed\n"); 125 if (int_status & DCU_INT_STATUS_VBLANK) 126 drm_handle_vblank(dev, 0); 127 128 ret = regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0xffffffff); 129 if (ret) 130 dev_err(dev->dev, "set DCU_INT_STATUS failed\n"); 131 ret = regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE, 132 DCU_UPDATE_MODE_READREG); 133 if (ret) 134 dev_err(dev->dev, "set DCU_UPDATE_MODE failed\n"); 135 136 return IRQ_HANDLED; 137 } 138 139 static int fsl_dcu_drm_enable_vblank(struct drm_device *dev, unsigned int pipe) 140 { 141 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private; 142 unsigned int value; 143 int ret; 144 145 ret = regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value); 146 if (ret) 147 dev_err(dev->dev, "read DCU_INT_MASK failed\n"); 148 value &= ~DCU_INT_MASK_VBLANK; 149 ret = regmap_write(fsl_dev->regmap, DCU_INT_MASK, value); 150 if (ret) 151 dev_err(dev->dev, "set DCU_INT_MASK failed\n"); 152 return 0; 153 } 154 155 static void fsl_dcu_drm_disable_vblank(struct drm_device *dev, 156 unsigned int pipe) 157 { 158 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private; 159 unsigned int value; 160 int ret; 161 162 ret = regmap_read(fsl_dev->regmap, DCU_INT_MASK, &value); 163 if (ret) 164 dev_err(dev->dev, "read DCU_INT_MASK failed\n"); 165 value |= DCU_INT_MASK_VBLANK; 166 ret = regmap_write(fsl_dev->regmap, DCU_INT_MASK, value); 167 if (ret) 168 dev_err(dev->dev, "set DCU_INT_MASK failed\n"); 169 } 170 171 static const struct file_operations fsl_dcu_drm_fops = { 172 .owner = THIS_MODULE, 173 .open = drm_open, 174 .release = drm_release, 175 .unlocked_ioctl = drm_ioctl, 176 #ifdef CONFIG_COMPAT 177 .compat_ioctl = drm_compat_ioctl, 178 #endif 179 .poll = drm_poll, 180 .read = drm_read, 181 .llseek = no_llseek, 182 .mmap = drm_gem_cma_mmap, 183 }; 184 185 static struct drm_driver fsl_dcu_drm_driver = { 186 .driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET 187 | DRIVER_PRIME | DRIVER_ATOMIC, 188 .load = fsl_dcu_load, 189 .unload = fsl_dcu_unload, 190 .irq_handler = fsl_dcu_drm_irq, 191 .get_vblank_counter = drm_vblank_no_hw_counter, 192 .enable_vblank = fsl_dcu_drm_enable_vblank, 193 .disable_vblank = fsl_dcu_drm_disable_vblank, 194 .gem_free_object = drm_gem_cma_free_object, 195 .gem_vm_ops = &drm_gem_cma_vm_ops, 196 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 197 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 198 .gem_prime_import = drm_gem_prime_import, 199 .gem_prime_export = drm_gem_prime_export, 200 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 201 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 202 .gem_prime_vmap = drm_gem_cma_prime_vmap, 203 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 204 .gem_prime_mmap = drm_gem_cma_prime_mmap, 205 .dumb_create = drm_gem_cma_dumb_create, 206 .dumb_map_offset = drm_gem_cma_dumb_map_offset, 207 .dumb_destroy = drm_gem_dumb_destroy, 208 .fops = &fsl_dcu_drm_fops, 209 .name = "fsl-dcu-drm", 210 .desc = "Freescale DCU DRM", 211 .date = "20150213", 212 .major = 1, 213 .minor = 0, 214 }; 215 216 #ifdef CONFIG_PM_SLEEP 217 static int fsl_dcu_drm_pm_suspend(struct device *dev) 218 { 219 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev); 220 221 if (!fsl_dev) 222 return 0; 223 224 drm_kms_helper_poll_disable(fsl_dev->drm); 225 regcache_cache_only(fsl_dev->regmap, true); 226 regcache_mark_dirty(fsl_dev->regmap); 227 clk_disable(fsl_dev->clk); 228 clk_unprepare(fsl_dev->clk); 229 230 return 0; 231 } 232 233 static int fsl_dcu_drm_pm_resume(struct device *dev) 234 { 235 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev); 236 int ret; 237 238 if (!fsl_dev) 239 return 0; 240 241 ret = clk_enable(fsl_dev->clk); 242 if (ret < 0) { 243 dev_err(dev, "failed to enable dcu clk\n"); 244 clk_unprepare(fsl_dev->clk); 245 return ret; 246 } 247 ret = clk_prepare(fsl_dev->clk); 248 if (ret < 0) { 249 dev_err(dev, "failed to prepare dcu clk\n"); 250 return ret; 251 } 252 253 drm_kms_helper_poll_enable(fsl_dev->drm); 254 regcache_cache_only(fsl_dev->regmap, false); 255 regcache_sync(fsl_dev->regmap); 256 257 return 0; 258 } 259 #endif 260 261 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = { 262 SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume) 263 }; 264 265 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = { 266 .name = "ls1021a", 267 .total_layer = 16, 268 .max_layer = 4, 269 }; 270 271 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = { 272 .name = "vf610", 273 .total_layer = 64, 274 .max_layer = 6, 275 }; 276 277 static const struct of_device_id fsl_dcu_of_match[] = { 278 { 279 .compatible = "fsl,ls1021a-dcu", 280 .data = &fsl_dcu_ls1021a_data, 281 }, { 282 .compatible = "fsl,vf610-dcu", 283 .data = &fsl_dcu_vf610_data, 284 }, { 285 }, 286 }; 287 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match); 288 289 static int fsl_dcu_drm_probe(struct platform_device *pdev) 290 { 291 struct fsl_dcu_drm_device *fsl_dev; 292 struct drm_device *drm; 293 struct device *dev = &pdev->dev; 294 struct resource *res; 295 void __iomem *base; 296 struct drm_driver *driver = &fsl_dcu_drm_driver; 297 const struct of_device_id *id; 298 int ret; 299 300 fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL); 301 if (!fsl_dev) 302 return -ENOMEM; 303 304 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 305 if (!res) { 306 dev_err(dev, "could not get memory IO resource\n"); 307 return -ENODEV; 308 } 309 310 base = devm_ioremap_resource(dev, res); 311 if (IS_ERR(base)) { 312 ret = PTR_ERR(base); 313 return ret; 314 } 315 316 fsl_dev->irq = platform_get_irq(pdev, 0); 317 if (fsl_dev->irq < 0) { 318 dev_err(dev, "failed to get irq\n"); 319 return -ENXIO; 320 } 321 322 fsl_dev->clk = devm_clk_get(dev, "dcu"); 323 if (IS_ERR(fsl_dev->clk)) { 324 ret = PTR_ERR(fsl_dev->clk); 325 dev_err(dev, "failed to get dcu clock\n"); 326 return ret; 327 } 328 ret = clk_prepare(fsl_dev->clk); 329 if (ret < 0) { 330 dev_err(dev, "failed to prepare dcu clk\n"); 331 return ret; 332 } 333 ret = clk_enable(fsl_dev->clk); 334 if (ret < 0) { 335 dev_err(dev, "failed to enable dcu clk\n"); 336 clk_unprepare(fsl_dev->clk); 337 return ret; 338 } 339 340 fsl_dev->regmap = devm_regmap_init_mmio(dev, base, 341 &fsl_dcu_regmap_config); 342 if (IS_ERR(fsl_dev->regmap)) { 343 dev_err(dev, "regmap init failed\n"); 344 return PTR_ERR(fsl_dev->regmap); 345 } 346 347 id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node); 348 if (!id) 349 return -ENODEV; 350 fsl_dev->soc = id->data; 351 352 drm = drm_dev_alloc(driver, dev); 353 if (!drm) 354 return -ENOMEM; 355 356 fsl_dev->dev = dev; 357 fsl_dev->drm = drm; 358 fsl_dev->np = dev->of_node; 359 drm->dev_private = fsl_dev; 360 dev_set_drvdata(dev, fsl_dev); 361 362 ret = drm_dev_register(drm, 0); 363 if (ret < 0) 364 goto unref; 365 366 DRM_INFO("Initialized %s %d.%d.%d %s on minor %d\n", driver->name, 367 driver->major, driver->minor, driver->patchlevel, 368 driver->date, drm->primary->index); 369 370 return 0; 371 372 unref: 373 drm_dev_unref(drm); 374 return ret; 375 } 376 377 static int fsl_dcu_drm_remove(struct platform_device *pdev) 378 { 379 struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev); 380 381 drm_put_dev(fsl_dev->drm); 382 383 return 0; 384 } 385 386 static struct platform_driver fsl_dcu_drm_platform_driver = { 387 .probe = fsl_dcu_drm_probe, 388 .remove = fsl_dcu_drm_remove, 389 .driver = { 390 .name = "fsl-dcu", 391 .pm = &fsl_dcu_drm_pm_ops, 392 .of_match_table = fsl_dcu_of_match, 393 }, 394 }; 395 396 module_platform_driver(fsl_dcu_drm_platform_driver); 397 398 MODULE_DESCRIPTION("Freescale DCU DRM Driver"); 399 MODULE_LICENSE("GPL"); 400