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