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