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_fbdev_dma.h> 24 #include <drm/drm_fourcc.h> 25 #include <drm/drm_gem_dma_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 clk_prepare_enable(mxsfb->clk_axi); 82 } 83 84 void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb) 85 { 86 clk_disable_unprepare(mxsfb->clk_axi); 87 } 88 89 static struct drm_framebuffer * 90 mxsfb_fb_create(struct drm_device *dev, struct drm_file *file_priv, 91 const struct drm_mode_fb_cmd2 *mode_cmd) 92 { 93 const struct drm_format_info *info; 94 95 info = drm_get_format_info(dev, mode_cmd); 96 if (!info) 97 return ERR_PTR(-EINVAL); 98 99 if (mode_cmd->width * info->cpp[0] != mode_cmd->pitches[0]) { 100 dev_dbg(dev->dev, "Invalid pitch: fb width must match pitch\n"); 101 return ERR_PTR(-EINVAL); 102 } 103 104 return drm_gem_fb_create(dev, file_priv, mode_cmd); 105 } 106 107 static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = { 108 .fb_create = mxsfb_fb_create, 109 .atomic_check = drm_atomic_helper_check, 110 .atomic_commit = drm_atomic_helper_commit, 111 }; 112 113 static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = { 114 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 115 }; 116 117 static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb) 118 { 119 struct drm_device *drm = mxsfb->drm; 120 struct drm_connector_list_iter iter; 121 struct drm_panel *panel; 122 struct drm_bridge *bridge; 123 int ret; 124 125 ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel, 126 &bridge); 127 if (ret) 128 return ret; 129 130 if (panel) { 131 bridge = devm_drm_panel_bridge_add_typed(drm->dev, panel, 132 DRM_MODE_CONNECTOR_DPI); 133 if (IS_ERR(bridge)) 134 return PTR_ERR(bridge); 135 } 136 137 if (!bridge) 138 return -ENODEV; 139 140 ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0); 141 if (ret) 142 return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n"); 143 144 mxsfb->bridge = bridge; 145 146 /* 147 * Get hold of the connector. This is a bit of a hack, until the bridge 148 * API gives us bus flags and formats. 149 */ 150 drm_connector_list_iter_begin(drm, &iter); 151 mxsfb->connector = drm_connector_list_iter_next(&iter); 152 drm_connector_list_iter_end(&iter); 153 154 return 0; 155 } 156 157 static irqreturn_t mxsfb_irq_handler(int irq, void *data) 158 { 159 struct drm_device *drm = data; 160 struct mxsfb_drm_private *mxsfb = drm->dev_private; 161 u32 reg, crc; 162 u64 vbc; 163 164 reg = readl(mxsfb->base + LCDC_CTRL1); 165 166 if (reg & CTRL1_CUR_FRAME_DONE_IRQ) { 167 drm_crtc_handle_vblank(&mxsfb->crtc); 168 if (mxsfb->crc_active) { 169 crc = readl(mxsfb->base + LCDC_V4_CRC_STAT); 170 vbc = drm_crtc_accurate_vblank_count(&mxsfb->crtc); 171 drm_crtc_add_crc_entry(&mxsfb->crtc, true, vbc, &crc); 172 } 173 } 174 175 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 176 177 return IRQ_HANDLED; 178 } 179 180 static void mxsfb_irq_disable(struct drm_device *drm) 181 { 182 struct mxsfb_drm_private *mxsfb = drm->dev_private; 183 184 mxsfb_enable_axi_clk(mxsfb); 185 186 /* Disable and clear VBLANK IRQ */ 187 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR); 188 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 189 190 mxsfb_disable_axi_clk(mxsfb); 191 } 192 193 static int mxsfb_irq_install(struct drm_device *dev, int irq) 194 { 195 if (irq == IRQ_NOTCONNECTED) 196 return -ENOTCONN; 197 198 mxsfb_irq_disable(dev); 199 200 return request_irq(irq, mxsfb_irq_handler, 0, dev->driver->name, dev); 201 } 202 203 static void mxsfb_irq_uninstall(struct drm_device *dev) 204 { 205 struct mxsfb_drm_private *mxsfb = dev->dev_private; 206 207 mxsfb_irq_disable(dev); 208 free_irq(mxsfb->irq, dev); 209 } 210 211 static int mxsfb_load(struct drm_device *drm, 212 const struct mxsfb_devdata *devdata) 213 { 214 struct platform_device *pdev = to_platform_device(drm->dev); 215 struct mxsfb_drm_private *mxsfb; 216 struct resource *res; 217 int ret; 218 219 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL); 220 if (!mxsfb) 221 return -ENOMEM; 222 223 mxsfb->drm = drm; 224 drm->dev_private = mxsfb; 225 mxsfb->devdata = devdata; 226 227 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 228 mxsfb->base = devm_ioremap_resource(drm->dev, res); 229 if (IS_ERR(mxsfb->base)) 230 return PTR_ERR(mxsfb->base); 231 232 mxsfb->clk = devm_clk_get(drm->dev, NULL); 233 if (IS_ERR(mxsfb->clk)) 234 return PTR_ERR(mxsfb->clk); 235 236 mxsfb->clk_axi = devm_clk_get_optional(drm->dev, "axi"); 237 if (IS_ERR(mxsfb->clk_axi)) 238 return PTR_ERR(mxsfb->clk_axi); 239 240 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi"); 241 if (IS_ERR(mxsfb->clk_disp_axi)) 242 mxsfb->clk_disp_axi = NULL; 243 244 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); 245 if (ret) 246 return ret; 247 248 pm_runtime_enable(drm->dev); 249 250 /* Modeset init */ 251 drm_mode_config_init(drm); 252 253 ret = mxsfb_kms_init(mxsfb); 254 if (ret < 0) { 255 dev_err(drm->dev, "Failed to initialize KMS pipeline\n"); 256 goto err_vblank; 257 } 258 259 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 260 if (ret < 0) { 261 dev_err(drm->dev, "Failed to initialise vblank\n"); 262 goto err_vblank; 263 } 264 265 /* Start with vertical blanking interrupt reporting disabled. */ 266 drm_crtc_vblank_off(&mxsfb->crtc); 267 268 ret = mxsfb_attach_bridge(mxsfb); 269 if (ret) { 270 dev_err_probe(drm->dev, ret, "Cannot connect bridge\n"); 271 goto err_vblank; 272 } 273 274 drm->mode_config.min_width = MXSFB_MIN_XRES; 275 drm->mode_config.min_height = MXSFB_MIN_YRES; 276 drm->mode_config.max_width = MXSFB_MAX_XRES; 277 drm->mode_config.max_height = MXSFB_MAX_YRES; 278 drm->mode_config.funcs = &mxsfb_mode_config_funcs; 279 drm->mode_config.helper_private = &mxsfb_mode_config_helpers; 280 281 drm_mode_config_reset(drm); 282 283 ret = platform_get_irq(pdev, 0); 284 if (ret < 0) 285 goto err_vblank; 286 mxsfb->irq = ret; 287 288 pm_runtime_get_sync(drm->dev); 289 ret = mxsfb_irq_install(drm, mxsfb->irq); 290 pm_runtime_put_sync(drm->dev); 291 292 if (ret < 0) { 293 dev_err(drm->dev, "Failed to install IRQ handler\n"); 294 goto err_vblank; 295 } 296 297 drm_kms_helper_poll_init(drm); 298 299 platform_set_drvdata(pdev, drm); 300 301 drm_helper_hpd_irq_event(drm); 302 303 return 0; 304 305 err_vblank: 306 pm_runtime_disable(drm->dev); 307 308 return ret; 309 } 310 311 static void mxsfb_unload(struct drm_device *drm) 312 { 313 drm_kms_helper_poll_fini(drm); 314 drm_mode_config_cleanup(drm); 315 316 pm_runtime_get_sync(drm->dev); 317 mxsfb_irq_uninstall(drm); 318 pm_runtime_put_sync(drm->dev); 319 320 drm->dev_private = NULL; 321 322 pm_runtime_disable(drm->dev); 323 } 324 325 DEFINE_DRM_GEM_DMA_FOPS(fops); 326 327 static const struct drm_driver mxsfb_driver = { 328 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 329 DRM_GEM_DMA_DRIVER_OPS, 330 .fops = &fops, 331 .name = "mxsfb-drm", 332 .desc = "MXSFB Controller DRM", 333 .date = "20160824", 334 .major = 1, 335 .minor = 0, 336 }; 337 338 static const struct of_device_id mxsfb_dt_ids[] = { 339 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devdata[MXSFB_V3], }, 340 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devdata[MXSFB_V4], }, 341 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devdata[MXSFB_V6], }, 342 { /* sentinel */ } 343 }; 344 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids); 345 346 static int mxsfb_probe(struct platform_device *pdev) 347 { 348 struct drm_device *drm; 349 const struct of_device_id *of_id = 350 of_match_device(mxsfb_dt_ids, &pdev->dev); 351 int ret; 352 353 if (!pdev->dev.of_node) 354 return -ENODEV; 355 356 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev); 357 if (IS_ERR(drm)) 358 return PTR_ERR(drm); 359 360 ret = mxsfb_load(drm, of_id->data); 361 if (ret) 362 goto err_free; 363 364 ret = drm_dev_register(drm, 0); 365 if (ret) 366 goto err_unload; 367 368 drm_fbdev_dma_setup(drm, 32); 369 370 return 0; 371 372 err_unload: 373 mxsfb_unload(drm); 374 err_free: 375 drm_dev_put(drm); 376 377 return ret; 378 } 379 380 static void mxsfb_remove(struct platform_device *pdev) 381 { 382 struct drm_device *drm = platform_get_drvdata(pdev); 383 384 drm_dev_unregister(drm); 385 drm_atomic_helper_shutdown(drm); 386 mxsfb_unload(drm); 387 drm_dev_put(drm); 388 } 389 390 static void mxsfb_shutdown(struct platform_device *pdev) 391 { 392 struct drm_device *drm = platform_get_drvdata(pdev); 393 394 drm_atomic_helper_shutdown(drm); 395 } 396 397 #ifdef CONFIG_PM_SLEEP 398 static int mxsfb_suspend(struct device *dev) 399 { 400 struct drm_device *drm = dev_get_drvdata(dev); 401 402 return drm_mode_config_helper_suspend(drm); 403 } 404 405 static int mxsfb_resume(struct device *dev) 406 { 407 struct drm_device *drm = dev_get_drvdata(dev); 408 409 return drm_mode_config_helper_resume(drm); 410 } 411 #endif 412 413 static const struct dev_pm_ops mxsfb_pm_ops = { 414 SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume) 415 }; 416 417 static struct platform_driver mxsfb_platform_driver = { 418 .probe = mxsfb_probe, 419 .remove_new = mxsfb_remove, 420 .shutdown = mxsfb_shutdown, 421 .driver = { 422 .name = "mxsfb", 423 .of_match_table = mxsfb_dt_ids, 424 .pm = &mxsfb_pm_ops, 425 }, 426 }; 427 428 drm_module_platform_driver(mxsfb_platform_driver); 429 430 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 431 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver"); 432 MODULE_LICENSE("GPL"); 433