1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2016 Marek Vasut <marex@denx.de> 4 * 5 * This code is based on drivers/video/fbdev/mxsfb.c : 6 * Copyright (C) 2010 Juergen Beisert, Pengutronix 7 * Copyright (C) 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved. 8 * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved. 9 */ 10 11 #include <linux/clk.h> 12 #include <linux/dma-mapping.h> 13 #include <linux/io.h> 14 #include <linux/module.h> 15 #include <linux/of_device.h> 16 #include <linux/platform_device.h> 17 #include <linux/pm_runtime.h> 18 19 #include <drm/drm_atomic_helper.h> 20 #include <drm/drm_bridge.h> 21 #include <drm/drm_connector.h> 22 #include <drm/drm_drv.h> 23 #include <drm/drm_fb_helper.h> 24 #include <drm/drm_fourcc.h> 25 #include <drm/drm_gem_cma_helper.h> 26 #include <drm/drm_gem_framebuffer_helper.h> 27 #include <drm/drm_mode_config.h> 28 #include <drm/drm_module.h> 29 #include <drm/drm_of.h> 30 #include <drm/drm_probe_helper.h> 31 #include <drm/drm_vblank.h> 32 33 #include "mxsfb_drv.h" 34 #include "mxsfb_regs.h" 35 36 enum mxsfb_devtype { 37 MXSFB_V3, 38 MXSFB_V4, 39 /* 40 * Starting at i.MX6 the hardware version register is gone, use the 41 * i.MX family number as the version. 42 */ 43 MXSFB_V6, 44 }; 45 46 static const struct mxsfb_devdata mxsfb_devdata[] = { 47 [MXSFB_V3] = { 48 .transfer_count = LCDC_V3_TRANSFER_COUNT, 49 .cur_buf = LCDC_V3_CUR_BUF, 50 .next_buf = LCDC_V3_NEXT_BUF, 51 .hs_wdth_mask = 0xff, 52 .hs_wdth_shift = 24, 53 .has_overlay = false, 54 .has_ctrl2 = false, 55 .has_crc32 = false, 56 }, 57 [MXSFB_V4] = { 58 .transfer_count = LCDC_V4_TRANSFER_COUNT, 59 .cur_buf = LCDC_V4_CUR_BUF, 60 .next_buf = LCDC_V4_NEXT_BUF, 61 .hs_wdth_mask = 0x3fff, 62 .hs_wdth_shift = 18, 63 .has_overlay = false, 64 .has_ctrl2 = true, 65 .has_crc32 = true, 66 }, 67 [MXSFB_V6] = { 68 .transfer_count = LCDC_V4_TRANSFER_COUNT, 69 .cur_buf = LCDC_V4_CUR_BUF, 70 .next_buf = LCDC_V4_NEXT_BUF, 71 .hs_wdth_mask = 0x3fff, 72 .hs_wdth_shift = 18, 73 .has_overlay = true, 74 .has_ctrl2 = true, 75 .has_crc32 = true, 76 }, 77 }; 78 79 void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb) 80 { 81 if (mxsfb->clk_axi) 82 clk_prepare_enable(mxsfb->clk_axi); 83 } 84 85 void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb) 86 { 87 if (mxsfb->clk_axi) 88 clk_disable_unprepare(mxsfb->clk_axi); 89 } 90 91 static struct drm_framebuffer * 92 mxsfb_fb_create(struct drm_device *dev, struct drm_file *file_priv, 93 const struct drm_mode_fb_cmd2 *mode_cmd) 94 { 95 const struct drm_format_info *info; 96 97 info = drm_get_format_info(dev, mode_cmd); 98 if (!info) 99 return ERR_PTR(-EINVAL); 100 101 if (mode_cmd->width * info->cpp[0] != mode_cmd->pitches[0]) { 102 dev_dbg(dev->dev, "Invalid pitch: fb width must match pitch\n"); 103 return ERR_PTR(-EINVAL); 104 } 105 106 return drm_gem_fb_create(dev, file_priv, mode_cmd); 107 } 108 109 static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = { 110 .fb_create = mxsfb_fb_create, 111 .atomic_check = drm_atomic_helper_check, 112 .atomic_commit = drm_atomic_helper_commit, 113 }; 114 115 static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = { 116 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 117 }; 118 119 static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb) 120 { 121 struct drm_device *drm = mxsfb->drm; 122 struct drm_connector_list_iter iter; 123 struct drm_panel *panel; 124 struct drm_bridge *bridge; 125 int ret; 126 127 ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel, 128 &bridge); 129 if (ret) 130 return ret; 131 132 if (panel) { 133 bridge = devm_drm_panel_bridge_add_typed(drm->dev, panel, 134 DRM_MODE_CONNECTOR_DPI); 135 if (IS_ERR(bridge)) 136 return PTR_ERR(bridge); 137 } 138 139 if (!bridge) 140 return -ENODEV; 141 142 ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0); 143 if (ret) 144 return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n"); 145 146 mxsfb->bridge = bridge; 147 148 /* 149 * Get hold of the connector. This is a bit of a hack, until the bridge 150 * API gives us bus flags and formats. 151 */ 152 drm_connector_list_iter_begin(drm, &iter); 153 mxsfb->connector = drm_connector_list_iter_next(&iter); 154 drm_connector_list_iter_end(&iter); 155 156 return 0; 157 } 158 159 static irqreturn_t mxsfb_irq_handler(int irq, void *data) 160 { 161 struct drm_device *drm = data; 162 struct mxsfb_drm_private *mxsfb = drm->dev_private; 163 u32 reg, crc; 164 u64 vbc; 165 166 reg = readl(mxsfb->base + LCDC_CTRL1); 167 168 if (reg & CTRL1_CUR_FRAME_DONE_IRQ) { 169 drm_crtc_handle_vblank(&mxsfb->crtc); 170 if (mxsfb->crc_active) { 171 crc = readl(mxsfb->base + LCDC_V4_CRC_STAT); 172 vbc = drm_crtc_accurate_vblank_count(&mxsfb->crtc); 173 drm_crtc_add_crc_entry(&mxsfb->crtc, true, vbc, &crc); 174 } 175 } 176 177 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 178 179 return IRQ_HANDLED; 180 } 181 182 static void mxsfb_irq_disable(struct drm_device *drm) 183 { 184 struct mxsfb_drm_private *mxsfb = drm->dev_private; 185 186 mxsfb_enable_axi_clk(mxsfb); 187 188 /* Disable and clear VBLANK IRQ */ 189 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR); 190 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 191 192 mxsfb_disable_axi_clk(mxsfb); 193 } 194 195 static int mxsfb_irq_install(struct drm_device *dev, int irq) 196 { 197 if (irq == IRQ_NOTCONNECTED) 198 return -ENOTCONN; 199 200 mxsfb_irq_disable(dev); 201 202 return request_irq(irq, mxsfb_irq_handler, 0, dev->driver->name, dev); 203 } 204 205 static void mxsfb_irq_uninstall(struct drm_device *dev) 206 { 207 struct mxsfb_drm_private *mxsfb = dev->dev_private; 208 209 mxsfb_irq_disable(dev); 210 free_irq(mxsfb->irq, dev); 211 } 212 213 static int mxsfb_load(struct drm_device *drm, 214 const struct mxsfb_devdata *devdata) 215 { 216 struct platform_device *pdev = to_platform_device(drm->dev); 217 struct mxsfb_drm_private *mxsfb; 218 struct resource *res; 219 int ret; 220 221 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL); 222 if (!mxsfb) 223 return -ENOMEM; 224 225 mxsfb->drm = drm; 226 drm->dev_private = mxsfb; 227 mxsfb->devdata = devdata; 228 229 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 230 mxsfb->base = devm_ioremap_resource(drm->dev, res); 231 if (IS_ERR(mxsfb->base)) 232 return PTR_ERR(mxsfb->base); 233 234 mxsfb->clk = devm_clk_get(drm->dev, NULL); 235 if (IS_ERR(mxsfb->clk)) 236 return PTR_ERR(mxsfb->clk); 237 238 mxsfb->clk_axi = devm_clk_get(drm->dev, "axi"); 239 if (IS_ERR(mxsfb->clk_axi)) 240 mxsfb->clk_axi = NULL; 241 242 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi"); 243 if (IS_ERR(mxsfb->clk_disp_axi)) 244 mxsfb->clk_disp_axi = NULL; 245 246 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); 247 if (ret) 248 return ret; 249 250 pm_runtime_enable(drm->dev); 251 252 /* Modeset init */ 253 drm_mode_config_init(drm); 254 255 ret = mxsfb_kms_init(mxsfb); 256 if (ret < 0) { 257 dev_err(drm->dev, "Failed to initialize KMS pipeline\n"); 258 goto err_vblank; 259 } 260 261 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 262 if (ret < 0) { 263 dev_err(drm->dev, "Failed to initialise vblank\n"); 264 goto err_vblank; 265 } 266 267 /* Start with vertical blanking interrupt reporting disabled. */ 268 drm_crtc_vblank_off(&mxsfb->crtc); 269 270 ret = mxsfb_attach_bridge(mxsfb); 271 if (ret) { 272 dev_err_probe(drm->dev, ret, "Cannot connect bridge\n"); 273 goto err_vblank; 274 } 275 276 drm->mode_config.min_width = MXSFB_MIN_XRES; 277 drm->mode_config.min_height = MXSFB_MIN_YRES; 278 drm->mode_config.max_width = MXSFB_MAX_XRES; 279 drm->mode_config.max_height = MXSFB_MAX_YRES; 280 drm->mode_config.funcs = &mxsfb_mode_config_funcs; 281 drm->mode_config.helper_private = &mxsfb_mode_config_helpers; 282 283 drm_mode_config_reset(drm); 284 285 ret = platform_get_irq(pdev, 0); 286 if (ret < 0) 287 goto err_vblank; 288 mxsfb->irq = ret; 289 290 pm_runtime_get_sync(drm->dev); 291 ret = mxsfb_irq_install(drm, mxsfb->irq); 292 pm_runtime_put_sync(drm->dev); 293 294 if (ret < 0) { 295 dev_err(drm->dev, "Failed to install IRQ handler\n"); 296 goto err_vblank; 297 } 298 299 drm_kms_helper_poll_init(drm); 300 301 platform_set_drvdata(pdev, drm); 302 303 drm_helper_hpd_irq_event(drm); 304 305 return 0; 306 307 err_vblank: 308 pm_runtime_disable(drm->dev); 309 310 return ret; 311 } 312 313 static void mxsfb_unload(struct drm_device *drm) 314 { 315 drm_kms_helper_poll_fini(drm); 316 drm_mode_config_cleanup(drm); 317 318 pm_runtime_get_sync(drm->dev); 319 mxsfb_irq_uninstall(drm); 320 pm_runtime_put_sync(drm->dev); 321 322 drm->dev_private = NULL; 323 324 pm_runtime_disable(drm->dev); 325 } 326 327 DEFINE_DRM_GEM_CMA_FOPS(fops); 328 329 static const struct drm_driver mxsfb_driver = { 330 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 331 DRM_GEM_CMA_DRIVER_OPS, 332 .fops = &fops, 333 .name = "mxsfb-drm", 334 .desc = "MXSFB Controller DRM", 335 .date = "20160824", 336 .major = 1, 337 .minor = 0, 338 }; 339 340 static const struct of_device_id mxsfb_dt_ids[] = { 341 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devdata[MXSFB_V3], }, 342 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devdata[MXSFB_V4], }, 343 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devdata[MXSFB_V6], }, 344 { /* sentinel */ } 345 }; 346 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids); 347 348 static int mxsfb_probe(struct platform_device *pdev) 349 { 350 struct drm_device *drm; 351 const struct of_device_id *of_id = 352 of_match_device(mxsfb_dt_ids, &pdev->dev); 353 int ret; 354 355 if (!pdev->dev.of_node) 356 return -ENODEV; 357 358 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev); 359 if (IS_ERR(drm)) 360 return PTR_ERR(drm); 361 362 ret = mxsfb_load(drm, of_id->data); 363 if (ret) 364 goto err_free; 365 366 ret = drm_dev_register(drm, 0); 367 if (ret) 368 goto err_unload; 369 370 drm_fbdev_generic_setup(drm, 32); 371 372 return 0; 373 374 err_unload: 375 mxsfb_unload(drm); 376 err_free: 377 drm_dev_put(drm); 378 379 return ret; 380 } 381 382 static int mxsfb_remove(struct platform_device *pdev) 383 { 384 struct drm_device *drm = platform_get_drvdata(pdev); 385 386 drm_dev_unregister(drm); 387 drm_atomic_helper_shutdown(drm); 388 mxsfb_unload(drm); 389 drm_dev_put(drm); 390 391 return 0; 392 } 393 394 static void mxsfb_shutdown(struct platform_device *pdev) 395 { 396 struct drm_device *drm = platform_get_drvdata(pdev); 397 398 drm_atomic_helper_shutdown(drm); 399 } 400 401 #ifdef CONFIG_PM_SLEEP 402 static int mxsfb_suspend(struct device *dev) 403 { 404 struct drm_device *drm = dev_get_drvdata(dev); 405 406 return drm_mode_config_helper_suspend(drm); 407 } 408 409 static int mxsfb_resume(struct device *dev) 410 { 411 struct drm_device *drm = dev_get_drvdata(dev); 412 413 return drm_mode_config_helper_resume(drm); 414 } 415 #endif 416 417 static const struct dev_pm_ops mxsfb_pm_ops = { 418 SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume) 419 }; 420 421 static struct platform_driver mxsfb_platform_driver = { 422 .probe = mxsfb_probe, 423 .remove = mxsfb_remove, 424 .shutdown = mxsfb_shutdown, 425 .driver = { 426 .name = "mxsfb", 427 .of_match_table = mxsfb_dt_ids, 428 .pm = &mxsfb_pm_ops, 429 }, 430 }; 431 432 drm_module_platform_driver(mxsfb_platform_driver); 433 434 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 435 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver"); 436 MODULE_LICENSE("GPL"); 437