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