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_drv.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_irq.h> 27 #include <drm/drm_modeset_helper.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_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 92 return 0; 93 done: 94 drm_kms_helper_poll_fini(dev); 95 96 drm_mode_config_cleanup(dev); 97 drm_irq_uninstall(dev); 98 dev->dev_private = NULL; 99 100 return ret; 101 } 102 103 static void fsl_dcu_unload(struct drm_device *dev) 104 { 105 drm_atomic_helper_shutdown(dev); 106 drm_kms_helper_poll_fini(dev); 107 108 drm_mode_config_cleanup(dev); 109 drm_irq_uninstall(dev); 110 111 dev->dev_private = NULL; 112 } 113 114 static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg) 115 { 116 struct drm_device *dev = arg; 117 struct fsl_dcu_drm_device *fsl_dev = dev->dev_private; 118 unsigned int int_status; 119 int ret; 120 121 ret = regmap_read(fsl_dev->regmap, DCU_INT_STATUS, &int_status); 122 if (ret) { 123 dev_err(dev->dev, "read DCU_INT_STATUS failed\n"); 124 return IRQ_NONE; 125 } 126 127 if (int_status & DCU_INT_STATUS_VBLANK) 128 drm_handle_vblank(dev, 0); 129 130 regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status); 131 132 return IRQ_HANDLED; 133 } 134 135 DEFINE_DRM_GEM_CMA_FOPS(fsl_dcu_drm_fops); 136 137 static const struct drm_driver fsl_dcu_drm_driver = { 138 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 139 .load = fsl_dcu_load, 140 .unload = fsl_dcu_unload, 141 .irq_handler = fsl_dcu_drm_irq, 142 .irq_preinstall = fsl_dcu_irq_uninstall, 143 .irq_uninstall = fsl_dcu_irq_uninstall, 144 DRM_GEM_CMA_DRIVER_OPS, 145 .fops = &fsl_dcu_drm_fops, 146 .name = "fsl-dcu-drm", 147 .desc = "Freescale DCU DRM", 148 .date = "20160425", 149 .major = 1, 150 .minor = 1, 151 }; 152 153 #ifdef CONFIG_PM_SLEEP 154 static int fsl_dcu_drm_pm_suspend(struct device *dev) 155 { 156 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev); 157 int ret; 158 159 if (!fsl_dev) 160 return 0; 161 162 disable_irq(fsl_dev->irq); 163 164 ret = drm_mode_config_helper_suspend(fsl_dev->drm); 165 if (ret) { 166 enable_irq(fsl_dev->irq); 167 return ret; 168 } 169 170 clk_disable_unprepare(fsl_dev->clk); 171 172 return 0; 173 } 174 175 static int fsl_dcu_drm_pm_resume(struct device *dev) 176 { 177 struct fsl_dcu_drm_device *fsl_dev = dev_get_drvdata(dev); 178 int ret; 179 180 if (!fsl_dev) 181 return 0; 182 183 ret = clk_prepare_enable(fsl_dev->clk); 184 if (ret < 0) { 185 dev_err(dev, "failed to enable dcu clk\n"); 186 return ret; 187 } 188 189 if (fsl_dev->tcon) 190 fsl_tcon_bypass_enable(fsl_dev->tcon); 191 fsl_dcu_drm_init_planes(fsl_dev->drm); 192 enable_irq(fsl_dev->irq); 193 194 drm_mode_config_helper_resume(fsl_dev->drm); 195 196 return 0; 197 } 198 #endif 199 200 static const struct dev_pm_ops fsl_dcu_drm_pm_ops = { 201 SET_SYSTEM_SLEEP_PM_OPS(fsl_dcu_drm_pm_suspend, fsl_dcu_drm_pm_resume) 202 }; 203 204 static const struct fsl_dcu_soc_data fsl_dcu_ls1021a_data = { 205 .name = "ls1021a", 206 .total_layer = 16, 207 .max_layer = 4, 208 .layer_regs = LS1021A_LAYER_REG_NUM, 209 }; 210 211 static const struct fsl_dcu_soc_data fsl_dcu_vf610_data = { 212 .name = "vf610", 213 .total_layer = 64, 214 .max_layer = 6, 215 .layer_regs = VF610_LAYER_REG_NUM, 216 }; 217 218 static const struct of_device_id fsl_dcu_of_match[] = { 219 { 220 .compatible = "fsl,ls1021a-dcu", 221 .data = &fsl_dcu_ls1021a_data, 222 }, { 223 .compatible = "fsl,vf610-dcu", 224 .data = &fsl_dcu_vf610_data, 225 }, { 226 }, 227 }; 228 MODULE_DEVICE_TABLE(of, fsl_dcu_of_match); 229 230 static int fsl_dcu_drm_probe(struct platform_device *pdev) 231 { 232 struct fsl_dcu_drm_device *fsl_dev; 233 struct drm_device *drm; 234 struct device *dev = &pdev->dev; 235 struct resource *res; 236 void __iomem *base; 237 struct clk *pix_clk_in; 238 char pix_clk_name[32]; 239 const char *pix_clk_in_name; 240 const struct of_device_id *id; 241 int ret; 242 u8 div_ratio_shift = 0; 243 244 fsl_dev = devm_kzalloc(dev, sizeof(*fsl_dev), GFP_KERNEL); 245 if (!fsl_dev) 246 return -ENOMEM; 247 248 id = of_match_node(fsl_dcu_of_match, pdev->dev.of_node); 249 if (!id) 250 return -ENODEV; 251 fsl_dev->soc = id->data; 252 253 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 254 base = devm_ioremap_resource(dev, res); 255 if (IS_ERR(base)) { 256 ret = PTR_ERR(base); 257 return ret; 258 } 259 260 fsl_dev->irq = platform_get_irq(pdev, 0); 261 if (fsl_dev->irq < 0) { 262 dev_err(dev, "failed to get irq\n"); 263 return fsl_dev->irq; 264 } 265 266 fsl_dev->regmap = devm_regmap_init_mmio(dev, base, 267 &fsl_dcu_regmap_config); 268 if (IS_ERR(fsl_dev->regmap)) { 269 dev_err(dev, "regmap init failed\n"); 270 return PTR_ERR(fsl_dev->regmap); 271 } 272 273 fsl_dev->clk = devm_clk_get(dev, "dcu"); 274 if (IS_ERR(fsl_dev->clk)) { 275 dev_err(dev, "failed to get dcu clock\n"); 276 return PTR_ERR(fsl_dev->clk); 277 } 278 ret = clk_prepare_enable(fsl_dev->clk); 279 if (ret < 0) { 280 dev_err(dev, "failed to enable dcu clk\n"); 281 return ret; 282 } 283 284 pix_clk_in = devm_clk_get(dev, "pix"); 285 if (IS_ERR(pix_clk_in)) { 286 /* legancy binding, use dcu clock as pixel clock input */ 287 pix_clk_in = fsl_dev->clk; 288 } 289 290 if (of_property_read_bool(dev->of_node, "big-endian")) 291 div_ratio_shift = 24; 292 293 pix_clk_in_name = __clk_get_name(pix_clk_in); 294 snprintf(pix_clk_name, sizeof(pix_clk_name), "%s_pix", pix_clk_in_name); 295 fsl_dev->pix_clk = clk_register_divider(dev, pix_clk_name, 296 pix_clk_in_name, 0, base + DCU_DIV_RATIO, 297 div_ratio_shift, 8, CLK_DIVIDER_ROUND_CLOSEST, NULL); 298 if (IS_ERR(fsl_dev->pix_clk)) { 299 dev_err(dev, "failed to register pix clk\n"); 300 ret = PTR_ERR(fsl_dev->pix_clk); 301 goto disable_clk; 302 } 303 304 fsl_dev->tcon = fsl_tcon_init(dev); 305 306 drm = drm_dev_alloc(&fsl_dcu_drm_driver, dev); 307 if (IS_ERR(drm)) { 308 ret = PTR_ERR(drm); 309 goto unregister_pix_clk; 310 } 311 312 fsl_dev->dev = dev; 313 fsl_dev->drm = drm; 314 fsl_dev->np = dev->of_node; 315 drm->dev_private = fsl_dev; 316 dev_set_drvdata(dev, fsl_dev); 317 318 ret = drm_dev_register(drm, 0); 319 if (ret < 0) 320 goto put; 321 322 drm_fbdev_generic_setup(drm, legacyfb_depth); 323 324 return 0; 325 326 put: 327 drm_dev_put(drm); 328 unregister_pix_clk: 329 clk_unregister(fsl_dev->pix_clk); 330 disable_clk: 331 clk_disable_unprepare(fsl_dev->clk); 332 return ret; 333 } 334 335 static int fsl_dcu_drm_remove(struct platform_device *pdev) 336 { 337 struct fsl_dcu_drm_device *fsl_dev = platform_get_drvdata(pdev); 338 339 drm_dev_unregister(fsl_dev->drm); 340 drm_dev_put(fsl_dev->drm); 341 clk_disable_unprepare(fsl_dev->clk); 342 clk_unregister(fsl_dev->pix_clk); 343 344 return 0; 345 } 346 347 static struct platform_driver fsl_dcu_drm_platform_driver = { 348 .probe = fsl_dcu_drm_probe, 349 .remove = fsl_dcu_drm_remove, 350 .driver = { 351 .name = "fsl-dcu", 352 .pm = &fsl_dcu_drm_pm_ops, 353 .of_match_table = fsl_dcu_of_match, 354 }, 355 }; 356 357 module_platform_driver(fsl_dcu_drm_platform_driver); 358 359 MODULE_DESCRIPTION("Freescale DCU DRM Driver"); 360 MODULE_LICENSE("GPL"); 361