1 /* 2 * Copyright (C) 2016 Marek Vasut <marex@denx.de> 3 * 4 * This code is based on drivers/video/fbdev/mxsfb.c : 5 * Copyright (C) 2010 Juergen Beisert, Pengutronix 6 * Copyright (C) 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved. 7 * Copyright (C) 2008 Embedded Alley Solutions, Inc All Rights Reserved. 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License 11 * as published by the Free Software Foundation; either version 2 12 * of the License, or (at your option) any later version. 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 */ 18 19 #include <linux/module.h> 20 #include <linux/spinlock.h> 21 #include <linux/clk.h> 22 #include <linux/component.h> 23 #include <linux/list.h> 24 #include <linux/of_device.h> 25 #include <linux/of_graph.h> 26 #include <linux/of_reserved_mem.h> 27 #include <linux/pm_runtime.h> 28 #include <linux/reservation.h> 29 30 #include <drm/drmP.h> 31 #include <drm/drm_atomic.h> 32 #include <drm/drm_atomic_helper.h> 33 #include <drm/drm_crtc.h> 34 #include <drm/drm_crtc_helper.h> 35 #include <drm/drm_fb_helper.h> 36 #include <drm/drm_fb_cma_helper.h> 37 #include <drm/drm_gem_cma_helper.h> 38 #include <drm/drm_gem_framebuffer_helper.h> 39 #include <drm/drm_of.h> 40 #include <drm/drm_panel.h> 41 #include <drm/drm_simple_kms_helper.h> 42 43 #include "mxsfb_drv.h" 44 #include "mxsfb_regs.h" 45 46 enum mxsfb_devtype { 47 MXSFB_V3, 48 MXSFB_V4, 49 }; 50 51 static const struct mxsfb_devdata mxsfb_devdata[] = { 52 [MXSFB_V3] = { 53 .transfer_count = LCDC_V3_TRANSFER_COUNT, 54 .cur_buf = LCDC_V3_CUR_BUF, 55 .next_buf = LCDC_V3_NEXT_BUF, 56 .debug0 = LCDC_V3_DEBUG0, 57 .hs_wdth_mask = 0xff, 58 .hs_wdth_shift = 24, 59 .ipversion = 3, 60 }, 61 [MXSFB_V4] = { 62 .transfer_count = LCDC_V4_TRANSFER_COUNT, 63 .cur_buf = LCDC_V4_CUR_BUF, 64 .next_buf = LCDC_V4_NEXT_BUF, 65 .debug0 = LCDC_V4_DEBUG0, 66 .hs_wdth_mask = 0x3fff, 67 .hs_wdth_shift = 18, 68 .ipversion = 4, 69 }, 70 }; 71 72 static const uint32_t mxsfb_formats[] = { 73 DRM_FORMAT_XRGB8888, 74 DRM_FORMAT_RGB565 75 }; 76 77 static struct mxsfb_drm_private * 78 drm_pipe_to_mxsfb_drm_private(struct drm_simple_display_pipe *pipe) 79 { 80 return container_of(pipe, struct mxsfb_drm_private, pipe); 81 } 82 83 void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb) 84 { 85 if (mxsfb->clk_axi) 86 clk_prepare_enable(mxsfb->clk_axi); 87 } 88 89 void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb) 90 { 91 if (mxsfb->clk_axi) 92 clk_disable_unprepare(mxsfb->clk_axi); 93 } 94 95 static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = { 96 .fb_create = drm_gem_fb_create, 97 .atomic_check = drm_atomic_helper_check, 98 .atomic_commit = drm_atomic_helper_commit, 99 }; 100 101 static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = { 102 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 103 }; 104 105 static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe, 106 struct drm_crtc_state *crtc_state, 107 struct drm_plane_state *plane_state) 108 { 109 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 110 struct drm_device *drm = pipe->plane.dev; 111 112 pm_runtime_get_sync(drm->dev); 113 drm_panel_prepare(mxsfb->panel); 114 mxsfb_crtc_enable(mxsfb); 115 drm_panel_enable(mxsfb->panel); 116 } 117 118 static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe) 119 { 120 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 121 struct drm_device *drm = pipe->plane.dev; 122 struct drm_crtc *crtc = &pipe->crtc; 123 struct drm_pending_vblank_event *event; 124 125 drm_panel_disable(mxsfb->panel); 126 mxsfb_crtc_disable(mxsfb); 127 drm_panel_unprepare(mxsfb->panel); 128 pm_runtime_put_sync(drm->dev); 129 130 spin_lock_irq(&drm->event_lock); 131 event = crtc->state->event; 132 if (event) { 133 crtc->state->event = NULL; 134 drm_crtc_send_vblank_event(crtc, event); 135 } 136 spin_unlock_irq(&drm->event_lock); 137 } 138 139 static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe, 140 struct drm_plane_state *plane_state) 141 { 142 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 143 144 mxsfb_plane_atomic_update(mxsfb, plane_state); 145 } 146 147 static int mxsfb_pipe_enable_vblank(struct drm_simple_display_pipe *pipe) 148 { 149 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 150 151 /* Clear and enable VBLANK IRQ */ 152 mxsfb_enable_axi_clk(mxsfb); 153 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 154 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET); 155 mxsfb_disable_axi_clk(mxsfb); 156 157 return 0; 158 } 159 160 static void mxsfb_pipe_disable_vblank(struct drm_simple_display_pipe *pipe) 161 { 162 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 163 164 /* Disable and clear VBLANK IRQ */ 165 mxsfb_enable_axi_clk(mxsfb); 166 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR); 167 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 168 mxsfb_disable_axi_clk(mxsfb); 169 } 170 171 static struct drm_simple_display_pipe_funcs mxsfb_funcs = { 172 .enable = mxsfb_pipe_enable, 173 .disable = mxsfb_pipe_disable, 174 .update = mxsfb_pipe_update, 175 .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb, 176 .enable_vblank = mxsfb_pipe_enable_vblank, 177 .disable_vblank = mxsfb_pipe_disable_vblank, 178 }; 179 180 static int mxsfb_load(struct drm_device *drm, unsigned long flags) 181 { 182 struct platform_device *pdev = to_platform_device(drm->dev); 183 struct mxsfb_drm_private *mxsfb; 184 struct resource *res; 185 int ret; 186 187 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL); 188 if (!mxsfb) 189 return -ENOMEM; 190 191 drm->dev_private = mxsfb; 192 mxsfb->devdata = &mxsfb_devdata[pdev->id_entry->driver_data]; 193 194 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 195 mxsfb->base = devm_ioremap_resource(drm->dev, res); 196 if (IS_ERR(mxsfb->base)) 197 return PTR_ERR(mxsfb->base); 198 199 mxsfb->clk = devm_clk_get(drm->dev, NULL); 200 if (IS_ERR(mxsfb->clk)) 201 return PTR_ERR(mxsfb->clk); 202 203 mxsfb->clk_axi = devm_clk_get(drm->dev, "axi"); 204 if (IS_ERR(mxsfb->clk_axi)) 205 mxsfb->clk_axi = NULL; 206 207 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi"); 208 if (IS_ERR(mxsfb->clk_disp_axi)) 209 mxsfb->clk_disp_axi = NULL; 210 211 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); 212 if (ret) 213 return ret; 214 215 pm_runtime_enable(drm->dev); 216 217 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 218 if (ret < 0) { 219 dev_err(drm->dev, "Failed to initialise vblank\n"); 220 goto err_vblank; 221 } 222 223 /* Modeset init */ 224 drm_mode_config_init(drm); 225 226 ret = mxsfb_create_output(drm); 227 if (ret < 0) { 228 dev_err(drm->dev, "Failed to create outputs\n"); 229 goto err_vblank; 230 } 231 232 ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs, 233 mxsfb_formats, ARRAY_SIZE(mxsfb_formats), NULL, 234 &mxsfb->connector); 235 if (ret < 0) { 236 dev_err(drm->dev, "Cannot setup simple display pipe\n"); 237 goto err_vblank; 238 } 239 240 ret = drm_panel_attach(mxsfb->panel, &mxsfb->connector); 241 if (ret) { 242 dev_err(drm->dev, "Cannot connect panel\n"); 243 goto err_vblank; 244 } 245 246 drm->mode_config.min_width = MXSFB_MIN_XRES; 247 drm->mode_config.min_height = MXSFB_MIN_YRES; 248 drm->mode_config.max_width = MXSFB_MAX_XRES; 249 drm->mode_config.max_height = MXSFB_MAX_YRES; 250 drm->mode_config.funcs = &mxsfb_mode_config_funcs; 251 drm->mode_config.helper_private = &mxsfb_mode_config_helpers; 252 253 drm_mode_config_reset(drm); 254 255 pm_runtime_get_sync(drm->dev); 256 ret = drm_irq_install(drm, platform_get_irq(pdev, 0)); 257 pm_runtime_put_sync(drm->dev); 258 259 if (ret < 0) { 260 dev_err(drm->dev, "Failed to install IRQ handler\n"); 261 goto err_irq; 262 } 263 264 drm_kms_helper_poll_init(drm); 265 266 mxsfb->fbdev = drm_fbdev_cma_init(drm, 32, 267 drm->mode_config.num_connector); 268 if (IS_ERR(mxsfb->fbdev)) { 269 ret = PTR_ERR(mxsfb->fbdev); 270 mxsfb->fbdev = NULL; 271 dev_err(drm->dev, "Failed to init FB CMA area\n"); 272 goto err_cma; 273 } 274 275 platform_set_drvdata(pdev, drm); 276 277 drm_helper_hpd_irq_event(drm); 278 279 return 0; 280 281 err_cma: 282 drm_irq_uninstall(drm); 283 err_irq: 284 drm_panel_detach(mxsfb->panel); 285 err_vblank: 286 pm_runtime_disable(drm->dev); 287 288 return ret; 289 } 290 291 static void mxsfb_unload(struct drm_device *drm) 292 { 293 struct mxsfb_drm_private *mxsfb = drm->dev_private; 294 295 if (mxsfb->fbdev) 296 drm_fbdev_cma_fini(mxsfb->fbdev); 297 298 drm_kms_helper_poll_fini(drm); 299 drm_mode_config_cleanup(drm); 300 301 pm_runtime_get_sync(drm->dev); 302 drm_irq_uninstall(drm); 303 pm_runtime_put_sync(drm->dev); 304 305 drm->dev_private = NULL; 306 307 pm_runtime_disable(drm->dev); 308 } 309 310 static void mxsfb_lastclose(struct drm_device *drm) 311 { 312 struct mxsfb_drm_private *mxsfb = drm->dev_private; 313 314 drm_fbdev_cma_restore_mode(mxsfb->fbdev); 315 } 316 317 static void mxsfb_irq_preinstall(struct drm_device *drm) 318 { 319 struct mxsfb_drm_private *mxsfb = drm->dev_private; 320 321 mxsfb_pipe_disable_vblank(&mxsfb->pipe); 322 } 323 324 static irqreturn_t mxsfb_irq_handler(int irq, void *data) 325 { 326 struct drm_device *drm = data; 327 struct mxsfb_drm_private *mxsfb = drm->dev_private; 328 u32 reg; 329 330 mxsfb_enable_axi_clk(mxsfb); 331 332 reg = readl(mxsfb->base + LCDC_CTRL1); 333 334 if (reg & CTRL1_CUR_FRAME_DONE_IRQ) 335 drm_crtc_handle_vblank(&mxsfb->pipe.crtc); 336 337 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 338 339 mxsfb_disable_axi_clk(mxsfb); 340 341 return IRQ_HANDLED; 342 } 343 344 DEFINE_DRM_GEM_CMA_FOPS(fops); 345 346 static struct drm_driver mxsfb_driver = { 347 .driver_features = DRIVER_GEM | DRIVER_MODESET | 348 DRIVER_PRIME | DRIVER_ATOMIC | 349 DRIVER_HAVE_IRQ, 350 .lastclose = mxsfb_lastclose, 351 .irq_handler = mxsfb_irq_handler, 352 .irq_preinstall = mxsfb_irq_preinstall, 353 .irq_uninstall = mxsfb_irq_preinstall, 354 .gem_free_object_unlocked = drm_gem_cma_free_object, 355 .gem_vm_ops = &drm_gem_cma_vm_ops, 356 .dumb_create = drm_gem_cma_dumb_create, 357 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 358 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 359 .gem_prime_export = drm_gem_prime_export, 360 .gem_prime_import = drm_gem_prime_import, 361 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 362 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 363 .gem_prime_vmap = drm_gem_cma_prime_vmap, 364 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 365 .gem_prime_mmap = drm_gem_cma_prime_mmap, 366 .fops = &fops, 367 .name = "mxsfb-drm", 368 .desc = "MXSFB Controller DRM", 369 .date = "20160824", 370 .major = 1, 371 .minor = 0, 372 }; 373 374 static const struct platform_device_id mxsfb_devtype[] = { 375 { .name = "imx23-fb", .driver_data = MXSFB_V3, }, 376 { .name = "imx28-fb", .driver_data = MXSFB_V4, }, 377 { .name = "imx6sx-fb", .driver_data = MXSFB_V4, }, 378 { /* sentinel */ } 379 }; 380 MODULE_DEVICE_TABLE(platform, mxsfb_devtype); 381 382 static const struct of_device_id mxsfb_dt_ids[] = { 383 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], }, 384 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], }, 385 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devtype[2], }, 386 { /* sentinel */ } 387 }; 388 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids); 389 390 static int mxsfb_probe(struct platform_device *pdev) 391 { 392 struct drm_device *drm; 393 const struct of_device_id *of_id = 394 of_match_device(mxsfb_dt_ids, &pdev->dev); 395 int ret; 396 397 if (!pdev->dev.of_node) 398 return -ENODEV; 399 400 if (of_id) 401 pdev->id_entry = of_id->data; 402 403 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev); 404 if (IS_ERR(drm)) 405 return PTR_ERR(drm); 406 407 ret = mxsfb_load(drm, 0); 408 if (ret) 409 goto err_free; 410 411 ret = drm_dev_register(drm, 0); 412 if (ret) 413 goto err_unload; 414 415 return 0; 416 417 err_unload: 418 mxsfb_unload(drm); 419 err_free: 420 drm_dev_put(drm); 421 422 return ret; 423 } 424 425 static int mxsfb_remove(struct platform_device *pdev) 426 { 427 struct drm_device *drm = platform_get_drvdata(pdev); 428 429 drm_dev_unregister(drm); 430 mxsfb_unload(drm); 431 drm_dev_put(drm); 432 433 return 0; 434 } 435 436 #ifdef CONFIG_PM_SLEEP 437 static int mxsfb_suspend(struct device *dev) 438 { 439 struct drm_device *drm = dev_get_drvdata(dev); 440 441 return drm_mode_config_helper_suspend(drm); 442 } 443 444 static int mxsfb_resume(struct device *dev) 445 { 446 struct drm_device *drm = dev_get_drvdata(dev); 447 448 return drm_mode_config_helper_resume(drm); 449 } 450 #endif 451 452 static const struct dev_pm_ops mxsfb_pm_ops = { 453 SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume) 454 }; 455 456 static struct platform_driver mxsfb_platform_driver = { 457 .probe = mxsfb_probe, 458 .remove = mxsfb_remove, 459 .id_table = mxsfb_devtype, 460 .driver = { 461 .name = "mxsfb", 462 .of_match_table = mxsfb_dt_ids, 463 .pm = &mxsfb_pm_ops, 464 }, 465 }; 466 467 module_platform_driver(mxsfb_platform_driver); 468 469 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 470 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver"); 471 MODULE_LICENSE("GPL"); 472