1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright 2015 Freescale Semiconductor, Inc. 4 * 5 * Freescale DCU drm device driver 6 */ 7 8 #include <linux/clk.h> 9 #include <linux/clk-provider.h> 10 #include <linux/console.h> 11 #include <linux/io.h> 12 #include <linux/mfd/syscon.h> 13 #include <linux/mm.h> 14 #include <linux/module.h> 15 #include <linux/of_platform.h> 16 #include <linux/platform_device.h> 17 #include <linux/pm.h> 18 #include <linux/pm_runtime.h> 19 #include <linux/regmap.h> 20 21 #include <drm/drm_atomic_helper.h> 22 #include <drm/drm_client_setup.h> 23 #include <drm/drm_drv.h> 24 #include <drm/drm_fbdev_dma.h> 25 #include <drm/drm_gem_dma_helper.h> 26 #include <drm/drm_modeset_helper.h> 27 #include <drm/drm_module.h> 28 #include <drm/drm_probe_helper.h> 29 #include <drm/drm_vblank.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_reset(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 irqreturn_t fsl_dcu_drm_irq(int irq, void *arg) 63 { 64 struct drm_device *dev = arg; 65 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private; 66 unsigned int int_status; 67 int ret; 68 69 ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status); 70 if (ret) { 71 dev_err(dev->dev, "read DCU_INT_STATUS failed\n"); 72 return IRQ_NONE; 73 } 74 75 if (int_status & DCU_INT_STATUS_VBLANK) 76 drm_handle_vblank(dev, 0); 77 78 regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status); 79 80 return IRQ_HANDLED; 81 } 82 83 static int fsl_dcu_irq_install(struct drm_device *dev, unsigned int irq) 84 { 85 if (irq == IRQ_NOTCONNECTED) 86 return -ENOTCONN; 87 88 fsl_dcu_irq_reset(dev); 89 90 return request_irq(irq, fsl_dcu_drm_irq, 0, dev->driver->name, dev); 91 } 92 93 static void fsl_dcu_irq_uninstall(struct drm_device *dev) 94 { 95 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private; 96 97 fsl_dcu_irq_reset(dev); 98 free_irq(fsl_dev->irq, dev); 99 } 100 101 static int fsl_dcu_load(struct drm_device *dev, unsigned long flags) 102 { 103 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private; 104 int ret; 105 106 ret = fsl_dcu_drm_modeset_init(fsl_dev); 107 if (ret < 0) { 108 dev_err(dev->dev, "failed to initialize mode setting\n"); 109 return ret; 110 } 111 112 ret = drm_vblank_init(dev, dev->mode_config.num_crtc); 113 if (ret < 0) { 114 dev_err(dev->dev, "failed to initialize vblank\n"); 115 goto done_vblank; 116 } 117 118 ret = fsl_dcu_irq_install(dev, fsl_dev->irq); 119 if (ret < 0) { 120 dev_err(dev->dev, "failed to install IRQ handler\n"); 121 goto done_irq; 122 } 123 124 if (legacyfb_depth != 16 && legacyfb_depth != 24 && 125 legacyfb_depth != 32) { 126 dev_warn(dev->dev, 127 "Invalid legacyfb_depth. Defaulting to 24bpp\n"); 128 legacyfb_depth = 24; 129 } 130 131 return 0; 132 done_irq: 133 drm_kms_helper_poll_fini(dev); 134 135 drm_mode_config_cleanup(dev); 136 done_vblank: 137 dev->dev_private = NULL; 138 139 return ret; 140 } 141 142 static void fsl_dcu_unload(struct drm_device *dev) 143 { 144 drm_atomic_helper_shutdown(dev); 145 drm_kms_helper_poll_fini(dev); 146 147 drm_mode_config_cleanup(dev); 148 fsl_dcu_irq_uninstall(dev); 149 150 dev->dev_private = NULL; 151 } 152 153 DEFINE_DRM_GEM_DMA_FOPS(fsl_dcu_drm_fops); 154 155 static const struct drm_driver fsl_dcu_drm_driver = { 156 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 157 .load = fsl_dcu_load, 158 .unload = fsl_dcu_unload, 159 DRM_GEM_DMA_DRIVER_OPS, 160 DRM_FBDEV_DMA_DRIVER_OPS, 161 .fops = &fsl_dcu_drm_fops, 162 .name = "fsl-dcu-drm", 163 .desc = "Freescale DCU DRM", 164 .date = "20160425", 165 .major = 1, 166 .minor = 1, 167 }; 168 169 #ifdef CONFIG_PM_SLEEP 170 static int fsl_dcu_drm_pm_suspend(struct device *dev) 171 { 172 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev); 173 int ret; 174 175 if (!fsl_dev) 176 return 0; 177 178 disable_irq(fsl_dev->irq); 179 180 ret = drm_mode_config_helper_suspend(fsl_dev->drm); 181 if (ret) { 182 enable_irq(fsl_dev->irq); 183 return ret; 184 } 185 186 clk_disable_unprepare(fsl_dev->clk); 187 188 return 0; 189 } 190 191 static int fsl_dcu_drm_pm_resume(struct device *dev) 192 { 193 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev); 194 int ret; 195 196 if (!fsl_dev) 197 return 0; 198 199 ret = clk_prepare_enable(fsl_dev->clk); 200 if (ret < 0) { 201 dev_err(dev, "failed to enable dcu clk\n"); 202 return ret; 203 } 204 205 if (fsl_dev->tcon) 206 fsl_tcon_bypass_enable(fsl_dev->tcon); 207 fsl_dcu_drm_init_planes(fsl_dev->drm); 208 enable_irq(fsl_dev->irq); 209 210 drm_mode_config_helper_resume(fsl_dev->drm); 211 212 return 0; 213 } 214 #endif 215 216 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = { 217 SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume) 218 }; 219 220 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = { 221 .name = "ls1021a", 222 .total_layer = 16, 223 .max_layer = 4, 224 .layer_regs = LS1021A_LAYER_REG_NUM, 225 }; 226 227 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = { 228 .name = "vf610", 229 .total_layer = 64, 230 .max_layer = 6, 231 .layer_regs = VF610_LAYER_REG_NUM, 232 }; 233 234 static const struct of_device_id fsl_dcu_of_match[] = { 235 { 236 .compatible = "fsl,ls1021a-dcu", 237 .data = &fsl_dcu_ls1021a_data, 238 }, { 239 .compatible = "fsl,vf610-dcu", 240 .data = &fsl_dcu_vf610_data, 241 }, { 242 }, 243 }; 244 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match); 245 246 static int fsl_dcu_drm_probe(struct platform_device *pdev) 247 { 248 struct fsl_dcu_drm_device *fsl_dev; 249 struct drm_device *drm; 250 struct device *dev = &pdev->dev; 251 struct resource *res; 252 void __iomem *base; 253 struct clk *pix_clk_in; 254 char pix_clk_name[32]; 255 const char *pix_clk_in_name; 256 const struct of_device_id *id; 257 int ret; 258 u8 div_ratio_shift = 0; 259 260 fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL); 261 if (!fsl_dev) 262 return -ENOMEM; 263 264 id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node); 265 if (!id) 266 return -ENODEV; 267 fsl_dev->soc = id->data; 268 269 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 270 base = devm_ioremap_resource(dev, res); 271 if (IS_ERR(base)) { 272 ret = PTR_ERR(base); 273 return ret; 274 } 275 276 fsl_dev->irq = platform_get_irq(pdev, 0); 277 if (fsl_dev->irq < 0) { 278 dev_err(dev, "failed to get irq\n"); 279 return fsl_dev->irq; 280 } 281 282 fsl_dev->regmap = devm_regmap_init_mmio(dev, base, 283 &fsl_dcu_regmap_config); 284 if (IS_ERR(fsl_dev->regmap)) { 285 dev_err(dev, "regmap init failed\n"); 286 return PTR_ERR(fsl_dev->regmap); 287 } 288 289 fsl_dev->clk = devm_clk_get(dev, "dcu"); 290 if (IS_ERR(fsl_dev->clk)) { 291 dev_err(dev, "failed to get dcu clock\n"); 292 return PTR_ERR(fsl_dev->clk); 293 } 294 ret = clk_prepare_enable(fsl_dev->clk); 295 if (ret < 0) { 296 dev_err(dev, "failed to enable dcu clk\n"); 297 return ret; 298 } 299 300 pix_clk_in = devm_clk_get(dev, "pix"); 301 if (IS_ERR(pix_clk_in)) { 302 /* legancy binding, use dcu clock as pixel clock input */ 303 pix_clk_in = fsl_dev->clk; 304 } 305 306 if (of_property_read_bool(dev->of_node, "big-endian")) 307 div_ratio_shift = 24; 308 309 pix_clk_in_name = __clk_get_name(pix_clk_in); 310 snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name); 311 fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name, 312 pix_clk_in_name, 0, base + DCU_DIV_RATIO, 313 div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL); 314 if (IS_ERR(fsl_dev->pix_clk)) { 315 dev_err(dev, "failed to register pix clk\n"); 316 ret = PTR_ERR(fsl_dev->pix_clk); 317 goto disable_clk; 318 } 319 320 fsl_dev->tcon = fsl_tcon_init(dev); 321 322 drm = drm_dev_alloc(&fsl_dcu_drm_driver, dev); 323 if (IS_ERR(drm)) { 324 ret = PTR_ERR(drm); 325 goto unregister_pix_clk; 326 } 327 328 fsl_dev->dev = dev; 329 fsl_dev->drm = drm; 330 fsl_dev->np = dev->of_node; 331 drm->dev_private = fsl_dev; 332 dev_set_drvdata(dev, fsl_dev); 333 334 ret = drm_dev_register(drm, 0); 335 if (ret < 0) 336 goto put; 337 338 drm_client_setup_with_color_mode(drm, legacyfb_depth); 339 340 return 0; 341 342 put: 343 drm_dev_put(drm); 344 unregister_pix_clk: 345 clk_unregister(fsl_dev->pix_clk); 346 disable_clk: 347 clk_disable_unprepare(fsl_dev->clk); 348 return ret; 349 } 350 351 static void fsl_dcu_drm_remove(struct platform_device *pdev) 352 { 353 struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev); 354 355 drm_dev_unregister(fsl_dev->drm); 356 drm_dev_put(fsl_dev->drm); 357 clk_disable_unprepare(fsl_dev->clk); 358 clk_unregister(fsl_dev->pix_clk); 359 } 360 361 static void fsl_dcu_drm_shutdown(struct platform_device *pdev) 362 { 363 struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev); 364 365 drm_atomic_helper_shutdown(fsl_dev->drm); 366 } 367 368 static struct platform_driver fsl_dcu_drm_platform_driver = { 369 .probe = fsl_dcu_drm_probe, 370 .remove_new = fsl_dcu_drm_remove, 371 .shutdown = fsl_dcu_drm_shutdown, 372 .driver = { 373 .name = "fsl-dcu", 374 .pm = &fsl_dcu_drm_pm_ops, 375 .of_match_table = fsl_dcu_of_match, 376 }, 377 }; 378 379 drm_module_platform_driver(fsl_dcu_drm_platform_driver); 380 381 MODULE_DESCRIPTION("Freescale DCU DRM Driver"); 382 MODULE_LICENSE("GPL"); 383