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 void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe, 102 struct drm_crtc_state *crtc_state, 103 struct drm_plane_state *plane_state) 104 { 105 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 106 107 drm_panel_prepare(mxsfb->panel); 108 mxsfb_crtc_enable(mxsfb); 109 drm_panel_enable(mxsfb->panel); 110 } 111 112 static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe) 113 { 114 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 115 116 drm_panel_disable(mxsfb->panel); 117 mxsfb_crtc_disable(mxsfb); 118 drm_panel_unprepare(mxsfb->panel); 119 } 120 121 static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe, 122 struct drm_plane_state *plane_state) 123 { 124 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 125 126 mxsfb_plane_atomic_update(mxsfb, plane_state); 127 } 128 129 static int mxsfb_pipe_enable_vblank(struct drm_simple_display_pipe *pipe) 130 { 131 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 132 133 /* Clear and enable VBLANK IRQ */ 134 mxsfb_enable_axi_clk(mxsfb); 135 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 136 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET); 137 mxsfb_disable_axi_clk(mxsfb); 138 139 return 0; 140 } 141 142 static void mxsfb_pipe_disable_vblank(struct drm_simple_display_pipe *pipe) 143 { 144 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 145 146 /* Disable and clear VBLANK IRQ */ 147 mxsfb_enable_axi_clk(mxsfb); 148 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR); 149 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 150 mxsfb_disable_axi_clk(mxsfb); 151 } 152 153 static struct drm_simple_display_pipe_funcs mxsfb_funcs = { 154 .enable = mxsfb_pipe_enable, 155 .disable = mxsfb_pipe_disable, 156 .update = mxsfb_pipe_update, 157 .prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb, 158 .enable_vblank = mxsfb_pipe_enable_vblank, 159 .disable_vblank = mxsfb_pipe_disable_vblank, 160 }; 161 162 static int mxsfb_load(struct drm_device *drm, unsigned long flags) 163 { 164 struct platform_device *pdev = to_platform_device(drm->dev); 165 struct mxsfb_drm_private *mxsfb; 166 struct resource *res; 167 int ret; 168 169 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL); 170 if (!mxsfb) 171 return -ENOMEM; 172 173 drm->dev_private = mxsfb; 174 mxsfb->devdata = &mxsfb_devdata[pdev->id_entry->driver_data]; 175 176 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 177 mxsfb->base = devm_ioremap_resource(drm->dev, res); 178 if (IS_ERR(mxsfb->base)) 179 return PTR_ERR(mxsfb->base); 180 181 mxsfb->clk = devm_clk_get(drm->dev, NULL); 182 if (IS_ERR(mxsfb->clk)) 183 return PTR_ERR(mxsfb->clk); 184 185 mxsfb->clk_axi = devm_clk_get(drm->dev, "axi"); 186 if (IS_ERR(mxsfb->clk_axi)) 187 mxsfb->clk_axi = NULL; 188 189 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi"); 190 if (IS_ERR(mxsfb->clk_disp_axi)) 191 mxsfb->clk_disp_axi = NULL; 192 193 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); 194 if (ret) 195 return ret; 196 197 pm_runtime_enable(drm->dev); 198 199 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 200 if (ret < 0) { 201 dev_err(drm->dev, "Failed to initialise vblank\n"); 202 goto err_vblank; 203 } 204 205 /* Modeset init */ 206 drm_mode_config_init(drm); 207 208 ret = mxsfb_create_output(drm); 209 if (ret < 0) { 210 dev_err(drm->dev, "Failed to create outputs\n"); 211 goto err_vblank; 212 } 213 214 ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs, 215 mxsfb_formats, ARRAY_SIZE(mxsfb_formats), NULL, 216 &mxsfb->connector); 217 if (ret < 0) { 218 dev_err(drm->dev, "Cannot setup simple display pipe\n"); 219 goto err_vblank; 220 } 221 222 ret = drm_panel_attach(mxsfb->panel, &mxsfb->connector); 223 if (ret) { 224 dev_err(drm->dev, "Cannot connect panel\n"); 225 goto err_vblank; 226 } 227 228 drm->mode_config.min_width = MXSFB_MIN_XRES; 229 drm->mode_config.min_height = MXSFB_MIN_YRES; 230 drm->mode_config.max_width = MXSFB_MAX_XRES; 231 drm->mode_config.max_height = MXSFB_MAX_YRES; 232 drm->mode_config.funcs = &mxsfb_mode_config_funcs; 233 234 drm_mode_config_reset(drm); 235 236 pm_runtime_get_sync(drm->dev); 237 ret = drm_irq_install(drm, platform_get_irq(pdev, 0)); 238 pm_runtime_put_sync(drm->dev); 239 240 if (ret < 0) { 241 dev_err(drm->dev, "Failed to install IRQ handler\n"); 242 goto err_irq; 243 } 244 245 drm_kms_helper_poll_init(drm); 246 247 mxsfb->fbdev = drm_fbdev_cma_init(drm, 32, 248 drm->mode_config.num_connector); 249 if (IS_ERR(mxsfb->fbdev)) { 250 ret = PTR_ERR(mxsfb->fbdev); 251 mxsfb->fbdev = NULL; 252 dev_err(drm->dev, "Failed to init FB CMA area\n"); 253 goto err_cma; 254 } 255 256 platform_set_drvdata(pdev, drm); 257 258 drm_helper_hpd_irq_event(drm); 259 260 return 0; 261 262 err_cma: 263 drm_irq_uninstall(drm); 264 err_irq: 265 drm_panel_detach(mxsfb->panel); 266 err_vblank: 267 pm_runtime_disable(drm->dev); 268 269 return ret; 270 } 271 272 static void mxsfb_unload(struct drm_device *drm) 273 { 274 struct mxsfb_drm_private *mxsfb = drm->dev_private; 275 276 if (mxsfb->fbdev) 277 drm_fbdev_cma_fini(mxsfb->fbdev); 278 279 drm_kms_helper_poll_fini(drm); 280 drm_mode_config_cleanup(drm); 281 282 pm_runtime_get_sync(drm->dev); 283 drm_irq_uninstall(drm); 284 pm_runtime_put_sync(drm->dev); 285 286 drm->dev_private = NULL; 287 288 pm_runtime_disable(drm->dev); 289 } 290 291 static void mxsfb_lastclose(struct drm_device *drm) 292 { 293 struct mxsfb_drm_private *mxsfb = drm->dev_private; 294 295 drm_fbdev_cma_restore_mode(mxsfb->fbdev); 296 } 297 298 static void mxsfb_irq_preinstall(struct drm_device *drm) 299 { 300 struct mxsfb_drm_private *mxsfb = drm->dev_private; 301 302 mxsfb_pipe_disable_vblank(&mxsfb->pipe); 303 } 304 305 static irqreturn_t mxsfb_irq_handler(int irq, void *data) 306 { 307 struct drm_device *drm = data; 308 struct mxsfb_drm_private *mxsfb = drm->dev_private; 309 u32 reg; 310 311 mxsfb_enable_axi_clk(mxsfb); 312 313 reg = readl(mxsfb->base + LCDC_CTRL1); 314 315 if (reg & CTRL1_CUR_FRAME_DONE_IRQ) 316 drm_crtc_handle_vblank(&mxsfb->pipe.crtc); 317 318 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 319 320 mxsfb_disable_axi_clk(mxsfb); 321 322 return IRQ_HANDLED; 323 } 324 325 DEFINE_DRM_GEM_CMA_FOPS(fops); 326 327 static struct drm_driver mxsfb_driver = { 328 .driver_features = DRIVER_GEM | DRIVER_MODESET | 329 DRIVER_PRIME | DRIVER_ATOMIC | 330 DRIVER_HAVE_IRQ, 331 .lastclose = mxsfb_lastclose, 332 .irq_handler = mxsfb_irq_handler, 333 .irq_preinstall = mxsfb_irq_preinstall, 334 .irq_uninstall = mxsfb_irq_preinstall, 335 .gem_free_object_unlocked = drm_gem_cma_free_object, 336 .gem_vm_ops = &drm_gem_cma_vm_ops, 337 .dumb_create = drm_gem_cma_dumb_create, 338 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 339 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 340 .gem_prime_export = drm_gem_prime_export, 341 .gem_prime_import = drm_gem_prime_import, 342 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 343 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 344 .gem_prime_vmap = drm_gem_cma_prime_vmap, 345 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 346 .gem_prime_mmap = drm_gem_cma_prime_mmap, 347 .fops = &fops, 348 .name = "mxsfb-drm", 349 .desc = "MXSFB Controller DRM", 350 .date = "20160824", 351 .major = 1, 352 .minor = 0, 353 }; 354 355 static const struct platform_device_id mxsfb_devtype[] = { 356 { .name = "imx23-fb", .driver_data = MXSFB_V3, }, 357 { .name = "imx28-fb", .driver_data = MXSFB_V4, }, 358 { .name = "imx6sx-fb", .driver_data = MXSFB_V4, }, 359 { /* sentinel */ } 360 }; 361 MODULE_DEVICE_TABLE(platform, mxsfb_devtype); 362 363 static const struct of_device_id mxsfb_dt_ids[] = { 364 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], }, 365 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], }, 366 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devtype[2], }, 367 { /* sentinel */ } 368 }; 369 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids); 370 371 static int mxsfb_probe(struct platform_device *pdev) 372 { 373 struct drm_device *drm; 374 const struct of_device_id *of_id = 375 of_match_device(mxsfb_dt_ids, &pdev->dev); 376 int ret; 377 378 if (!pdev->dev.of_node) 379 return -ENODEV; 380 381 if (of_id) 382 pdev->id_entry = of_id->data; 383 384 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev); 385 if (IS_ERR(drm)) 386 return PTR_ERR(drm); 387 388 ret = mxsfb_load(drm, 0); 389 if (ret) 390 goto err_free; 391 392 ret = drm_dev_register(drm, 0); 393 if (ret) 394 goto err_unload; 395 396 return 0; 397 398 err_unload: 399 mxsfb_unload(drm); 400 err_free: 401 drm_dev_unref(drm); 402 403 return ret; 404 } 405 406 static int mxsfb_remove(struct platform_device *pdev) 407 { 408 struct drm_device *drm = platform_get_drvdata(pdev); 409 410 drm_dev_unregister(drm); 411 mxsfb_unload(drm); 412 drm_dev_unref(drm); 413 414 return 0; 415 } 416 417 static struct platform_driver mxsfb_platform_driver = { 418 .probe = mxsfb_probe, 419 .remove = mxsfb_remove, 420 .id_table = mxsfb_devtype, 421 .driver = { 422 .name = "mxsfb", 423 .of_match_table = mxsfb_dt_ids, 424 }, 425 }; 426 427 module_platform_driver(mxsfb_platform_driver); 428 429 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 430 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver"); 431 MODULE_LICENSE("GPL"); 432