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/console.h> 15 #include <linux/io.h> 16 #include <linux/mfd/syscon.h> 17 #include <linux/mm.h> 18 #include <linux/module.h> 19 #include <linux/of_platform.h> 20 #include <linux/platform_device.h> 21 #include <linux/pm.h> 22 #include <linux/pm_runtime.h> 23 #include <linux/regmap.h> 24 25 #include <drm/drmP.h> 26 #include <drm/drm_atomic_helper.h> 27 #include <drm/drm_crtc_helper.h> 28 #include <drm/drm_fb_cma_helper.h> 29 #include <drm/drm_gem_cma_helper.h> 30 31 #include "fsl_dcu_drm_crtc.h" 32 #include "fsl_dcu_drm_drv.h" 33 #include "fsl_tcon.h" 34 35 static int legacyfb_depth = 24; 36 module_param(legacyfb_depth, int, 0444); 37 38 static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg) 39 { 40 if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE) 41 return true; 42 43 return false; 44 } 45 46 static const struct regmap_config fsl_dcu_regmap_config = { 47 .reg_bits = 32, 48 .reg_stride = 4, 49 .val_bits = 32, 50 51 .volatile_reg = fsl_dcu_drm_is_volatile_reg, 52 }; 53 54 static int fsl_dcu_drm_irq_init(struct drm_device *dev) 55 { 56 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private; 57 int ret; 58 59 ret = drm_irq_install(dev, fsl_dev->irq); 60 if (ret < 0) 61 dev_err(dev->dev, "failed to install IRQ handler\n"); 62 63 regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0); 64 regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0); 65 66 return ret; 67 } 68 69 static int fsl_dcu_load(struct drm_device *dev, unsigned long flags) 70 { 71 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private; 72 int ret; 73 74 ret = fsl_dcu_drm_modeset_init(fsl_dev); 75 if (ret < 0) { 76 dev_err(dev->dev, "failed to initialize mode setting\n"); 77 return ret; 78 } 79 80 ret = drm_vblank_init(dev, dev->mode_config.num_crtc); 81 if (ret < 0) { 82 dev_err(dev->dev, "failed to initialize vblank\n"); 83 goto done; 84 } 85 86 ret = fsl_dcu_drm_irq_init(dev); 87 if (ret < 0) 88 goto done; 89 dev->irq_enabled = true; 90 91 if (legacyfb_depth != 16 && legacyfb_depth != 24 && 92 legacyfb_depth != 32) { 93 dev_warn(dev->dev, 94 "Invalid legacyfb_depth. Defaulting to 24bpp\n"); 95 legacyfb_depth = 24; 96 } 97 fsl_dev->fbdev = drm_fbdev_cma_init(dev, legacyfb_depth, 1); 98 if (IS_ERR(fsl_dev->fbdev)) { 99 ret = PTR_ERR(fsl_dev->fbdev); 100 fsl_dev->fbdev = NULL; 101 goto done; 102 } 103 104 return 0; 105 done: 106 drm_kms_helper_poll_fini(dev); 107 108 if (fsl_dev->fbdev) 109 drm_fbdev_cma_fini(fsl_dev->fbdev); 110 111 drm_mode_config_cleanup(dev); 112 drm_vblank_cleanup(dev); 113 drm_irq_uninstall(dev); 114 dev->dev_private = NULL; 115 116 return ret; 117 } 118 119 static void fsl_dcu_unload(struct drm_device *dev) 120 { 121 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private; 122 123 drm_crtc_force_disable_all(dev); 124 drm_kms_helper_poll_fini(dev); 125 126 if (fsl_dev->fbdev) 127 drm_fbdev_cma_fini(fsl_dev->fbdev); 128 129 drm_mode_config_cleanup(dev); 130 drm_vblank_cleanup(dev); 131 drm_irq_uninstall(dev); 132 133 dev->dev_private = NULL; 134 } 135 136 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg) 137 { 138 struct drm_device *dev = arg; 139 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private; 140 unsigned int int_status; 141 int ret; 142 143 ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status); 144 if (ret) { 145 dev_err(dev->dev, "read DCU_INT_STATUS failed\n"); 146 return IRQ_NONE; 147 } 148 149 if (int_status & DCU_INT_STATUS_VBLANK) 150 drm_handle_vblank(dev, 0); 151 152 regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status); 153 154 return IRQ_HANDLED; 155 } 156 157 static void fsl_dcu_drm_lastclose(struct drm_device *dev) 158 { 159 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private; 160 161 drm_fbdev_cma_restore_mode(fsl_dev->fbdev); 162 } 163 164 DEFINE_DRM_GEM_CMA_FOPS(fsl_dcu_drm_fops); 165 166 static struct drm_driver fsl_dcu_drm_driver = { 167 .driver_features = DRIVER_HAVE_IRQ | DRIVER_GEM | DRIVER_MODESET 168 | DRIVER_PRIME | DRIVER_ATOMIC, 169 .lastclose = fsl_dcu_drm_lastclose, 170 .load = fsl_dcu_load, 171 .unload = fsl_dcu_unload, 172 .irq_handler = fsl_dcu_drm_irq, 173 .gem_free_object_unlocked = drm_gem_cma_free_object, 174 .gem_vm_ops = &drm_gem_cma_vm_ops, 175 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 176 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 177 .gem_prime_import = drm_gem_prime_import, 178 .gem_prime_export = drm_gem_prime_export, 179 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 180 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 181 .gem_prime_vmap = drm_gem_cma_prime_vmap, 182 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 183 .gem_prime_mmap = drm_gem_cma_prime_mmap, 184 .dumb_create = drm_gem_cma_dumb_create, 185 .dumb_map_offset = drm_gem_cma_dumb_map_offset, 186 .dumb_destroy = drm_gem_dumb_destroy, 187 .fops = &fsl_dcu_drm_fops, 188 .name = "fsl-dcu-drm", 189 .desc = "Freescale DCU DRM", 190 .date = "20160425", 191 .major = 1, 192 .minor = 1, 193 }; 194 195 #ifdef CONFIG_PM_SLEEP 196 static int fsl_dcu_drm_pm_suspend(struct device *dev) 197 { 198 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev); 199 200 if (!fsl_dev) 201 return 0; 202 203 disable_irq(fsl_dev->irq); 204 drm_kms_helper_poll_disable(fsl_dev->drm); 205 206 console_lock(); 207 drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 1); 208 console_unlock(); 209 210 fsl_dev->state = drm_atomic_helper_suspend(fsl_dev->drm); 211 if (IS_ERR(fsl_dev->state)) { 212 console_lock(); 213 drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 0); 214 console_unlock(); 215 216 drm_kms_helper_poll_enable(fsl_dev->drm); 217 enable_irq(fsl_dev->irq); 218 return PTR_ERR(fsl_dev->state); 219 } 220 221 clk_disable_unprepare(fsl_dev->pix_clk); 222 clk_disable_unprepare(fsl_dev->clk); 223 224 return 0; 225 } 226 227 static int fsl_dcu_drm_pm_resume(struct device *dev) 228 { 229 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev); 230 int ret; 231 232 if (!fsl_dev) 233 return 0; 234 235 ret = clk_prepare_enable(fsl_dev->clk); 236 if (ret < 0) { 237 dev_err(dev, "failed to enable dcu clk\n"); 238 return ret; 239 } 240 241 if (fsl_dev->tcon) 242 fsl_tcon_bypass_enable(fsl_dev->tcon); 243 fsl_dcu_drm_init_planes(fsl_dev->drm); 244 drm_atomic_helper_resume(fsl_dev->drm, fsl_dev->state); 245 246 console_lock(); 247 drm_fbdev_cma_set_suspend(fsl_dev->fbdev, 0); 248 console_unlock(); 249 250 drm_kms_helper_poll_enable(fsl_dev->drm); 251 enable_irq(fsl_dev->irq); 252 253 return 0; 254 } 255 #endif 256 257 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = { 258 SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume) 259 }; 260 261 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = { 262 .name = "ls1021a", 263 .total_layer = 16, 264 .max_layer = 4, 265 .layer_regs = LS1021A_LAYER_REG_NUM, 266 }; 267 268 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = { 269 .name = "vf610", 270 .total_layer = 64, 271 .max_layer = 6, 272 .layer_regs = VF610_LAYER_REG_NUM, 273 }; 274 275 static const struct of_device_id fsl_dcu_of_match[] = { 276 { 277 .compatible = "fsl,ls1021a-dcu", 278 .data = &fsl_dcu_ls1021a_data, 279 }, { 280 .compatible = "fsl,vf610-dcu", 281 .data = &fsl_dcu_vf610_data, 282 }, { 283 }, 284 }; 285 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match); 286 287 static int fsl_dcu_drm_probe(struct platform_device *pdev) 288 { 289 struct fsl_dcu_drm_device *fsl_dev; 290 struct drm_device *drm; 291 struct device *dev = &pdev->dev; 292 struct resource *res; 293 void __iomem *base; 294 struct drm_driver *driver = &fsl_dcu_drm_driver; 295 struct clk *pix_clk_in; 296 char pix_clk_name[32]; 297 const char *pix_clk_in_name; 298 const struct of_device_id *id; 299 int ret; 300 u8 div_ratio_shift = 0; 301 302 fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL); 303 if (!fsl_dev) 304 return -ENOMEM; 305 306 id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node); 307 if (!id) 308 return -ENODEV; 309 fsl_dev->soc = id->data; 310 311 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 312 base = devm_ioremap_resource(dev, res); 313 if (IS_ERR(base)) { 314 ret = PTR_ERR(base); 315 return ret; 316 } 317 318 fsl_dev->irq = platform_get_irq(pdev, 0); 319 if (fsl_dev->irq < 0) { 320 dev_err(dev, "failed to get irq\n"); 321 return fsl_dev->irq; 322 } 323 324 fsl_dev->regmap = devm_regmap_init_mmio(dev, base, 325 &fsl_dcu_regmap_config); 326 if (IS_ERR(fsl_dev->regmap)) { 327 dev_err(dev, "regmap init failed\n"); 328 return PTR_ERR(fsl_dev->regmap); 329 } 330 331 fsl_dev->clk = devm_clk_get(dev, "dcu"); 332 if (IS_ERR(fsl_dev->clk)) { 333 dev_err(dev, "failed to get dcu clock\n"); 334 return PTR_ERR(fsl_dev->clk); 335 } 336 ret = clk_prepare_enable(fsl_dev->clk); 337 if (ret < 0) { 338 dev_err(dev, "failed to enable dcu clk\n"); 339 return ret; 340 } 341 342 pix_clk_in = devm_clk_get(dev, "pix"); 343 if (IS_ERR(pix_clk_in)) { 344 /* legancy binding, use dcu clock as pixel clock input */ 345 pix_clk_in = fsl_dev->clk; 346 } 347 348 if (of_property_read_bool(dev->of_node, "big-endian")) 349 div_ratio_shift = 24; 350 351 pix_clk_in_name = __clk_get_name(pix_clk_in); 352 snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name); 353 fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name, 354 pix_clk_in_name, 0, base + DCU_DIV_RATIO, 355 div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL); 356 if (IS_ERR(fsl_dev->pix_clk)) { 357 dev_err(dev, "failed to register pix clk\n"); 358 ret = PTR_ERR(fsl_dev->pix_clk); 359 goto disable_clk; 360 } 361 362 fsl_dev->tcon = fsl_tcon_init(dev); 363 364 drm = drm_dev_alloc(driver, dev); 365 if (IS_ERR(drm)) { 366 ret = PTR_ERR(drm); 367 goto unregister_pix_clk; 368 } 369 370 fsl_dev->dev = dev; 371 fsl_dev->drm = drm; 372 fsl_dev->np = dev->of_node; 373 drm->dev_private = fsl_dev; 374 dev_set_drvdata(dev, fsl_dev); 375 376 ret = drm_dev_register(drm, 0); 377 if (ret < 0) 378 goto unref; 379 380 return 0; 381 382 unref: 383 drm_dev_unref(drm); 384 unregister_pix_clk: 385 clk_unregister(fsl_dev->pix_clk); 386 disable_clk: 387 clk_disable_unprepare(fsl_dev->clk); 388 return ret; 389 } 390 391 static int fsl_dcu_drm_remove(struct platform_device *pdev) 392 { 393 struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev); 394 395 drm_dev_unregister(fsl_dev->drm); 396 drm_dev_unref(fsl_dev->drm); 397 clk_disable_unprepare(fsl_dev->clk); 398 clk_unregister(fsl_dev->pix_clk); 399 400 return 0; 401 } 402 403 static struct platform_driver fsl_dcu_drm_platform_driver = { 404 .probe = fsl_dcu_drm_probe, 405 .remove = fsl_dcu_drm_remove, 406 .driver = { 407 .name = "fsl-dcu", 408 .pm = &fsl_dcu_drm_pm_ops, 409 .of_match_table = fsl_dcu_of_match, 410 }, 411 }; 412 413 module_platform_driver(fsl_dcu_drm_platform_driver); 414 415 MODULE_DESCRIPTION("Freescale DCU DRM Driver"); 416 MODULE_LICENSE("GPL"); 417