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_of.h> 39 #include <drm/drm_panel.h> 40 #include <drm/drm_simple_kms_helper.h> 41 42 #include "mxsfb_drv.h" 43 #include "mxsfb_regs.h" 44 45 enum mxsfb_devtype { 46 MXSFB_V3, 47 MXSFB_V4, 48 }; 49 50 static const struct mxsfb_devdata mxsfb_devdata[] = { 51 [MXSFB_V3] = { 52 .transfer_count = LCDC_V3_TRANSFER_COUNT, 53 .cur_buf = LCDC_V3_CUR_BUF, 54 .next_buf = LCDC_V3_NEXT_BUF, 55 .debug0 = LCDC_V3_DEBUG0, 56 .hs_wdth_mask = 0xff, 57 .hs_wdth_shift = 24, 58 .ipversion = 3, 59 }, 60 [MXSFB_V4] = { 61 .transfer_count = LCDC_V4_TRANSFER_COUNT, 62 .cur_buf = LCDC_V4_CUR_BUF, 63 .next_buf = LCDC_V4_NEXT_BUF, 64 .debug0 = LCDC_V4_DEBUG0, 65 .hs_wdth_mask = 0x3fff, 66 .hs_wdth_shift = 18, 67 .ipversion = 4, 68 }, 69 }; 70 71 static const uint32_t mxsfb_formats[] = { 72 DRM_FORMAT_XRGB8888, 73 DRM_FORMAT_RGB565 74 }; 75 76 static struct mxsfb_drm_private * 77 drm_pipe_to_mxsfb_drm_private(struct drm_simple_display_pipe *pipe) 78 { 79 return container_of(pipe, struct mxsfb_drm_private, pipe); 80 } 81 82 void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb) 83 { 84 if (mxsfb->clk_axi) 85 clk_prepare_enable(mxsfb->clk_axi); 86 } 87 88 void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb) 89 { 90 if (mxsfb->clk_axi) 91 clk_disable_unprepare(mxsfb->clk_axi); 92 } 93 94 static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = { 95 .fb_create = drm_fb_cma_create, 96 .atomic_check = drm_atomic_helper_check, 97 .atomic_commit = drm_atomic_helper_commit, 98 }; 99 100 static void mxsfb_pipe_enable(struct drm_simple_display_pipe *pipe, 101 struct drm_crtc_state *crtc_state) 102 { 103 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 104 105 drm_panel_prepare(mxsfb->panel); 106 mxsfb_crtc_enable(mxsfb); 107 drm_panel_enable(mxsfb->panel); 108 } 109 110 static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe) 111 { 112 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 113 114 drm_panel_disable(mxsfb->panel); 115 mxsfb_crtc_disable(mxsfb); 116 drm_panel_unprepare(mxsfb->panel); 117 } 118 119 static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe, 120 struct drm_plane_state *plane_state) 121 { 122 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 123 124 mxsfb_plane_atomic_update(mxsfb, plane_state); 125 } 126 127 static int mxsfb_pipe_prepare_fb(struct drm_simple_display_pipe *pipe, 128 struct drm_plane_state *plane_state) 129 { 130 return drm_fb_cma_prepare_fb(&pipe->plane, plane_state); 131 } 132 133 static struct drm_simple_display_pipe_funcs mxsfb_funcs = { 134 .enable = mxsfb_pipe_enable, 135 .disable = mxsfb_pipe_disable, 136 .update = mxsfb_pipe_update, 137 .prepare_fb = mxsfb_pipe_prepare_fb, 138 }; 139 140 static int mxsfb_load(struct drm_device *drm, unsigned long flags) 141 { 142 struct platform_device *pdev = to_platform_device(drm->dev); 143 struct mxsfb_drm_private *mxsfb; 144 struct resource *res; 145 int ret; 146 147 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL); 148 if (!mxsfb) 149 return -ENOMEM; 150 151 drm->dev_private = mxsfb; 152 mxsfb->devdata = &mxsfb_devdata[pdev->id_entry->driver_data]; 153 154 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 155 mxsfb->base = devm_ioremap_resource(drm->dev, res); 156 if (IS_ERR(mxsfb->base)) 157 return PTR_ERR(mxsfb->base); 158 159 mxsfb->clk = devm_clk_get(drm->dev, NULL); 160 if (IS_ERR(mxsfb->clk)) 161 return PTR_ERR(mxsfb->clk); 162 163 mxsfb->clk_axi = devm_clk_get(drm->dev, "axi"); 164 if (IS_ERR(mxsfb->clk_axi)) 165 mxsfb->clk_axi = NULL; 166 167 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi"); 168 if (IS_ERR(mxsfb->clk_disp_axi)) 169 mxsfb->clk_disp_axi = NULL; 170 171 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); 172 if (ret) 173 return ret; 174 175 pm_runtime_enable(drm->dev); 176 177 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 178 if (ret < 0) { 179 dev_err(drm->dev, "Failed to initialise vblank\n"); 180 goto err_vblank; 181 } 182 183 /* Modeset init */ 184 drm_mode_config_init(drm); 185 186 ret = mxsfb_create_output(drm); 187 if (ret < 0) { 188 dev_err(drm->dev, "Failed to create outputs\n"); 189 goto err_vblank; 190 } 191 192 ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs, 193 mxsfb_formats, ARRAY_SIZE(mxsfb_formats), 194 &mxsfb->connector); 195 if (ret < 0) { 196 dev_err(drm->dev, "Cannot setup simple display pipe\n"); 197 goto err_vblank; 198 } 199 200 ret = drm_panel_attach(mxsfb->panel, &mxsfb->connector); 201 if (ret) { 202 dev_err(drm->dev, "Cannot connect panel\n"); 203 goto err_vblank; 204 } 205 206 drm->mode_config.min_width = MXSFB_MIN_XRES; 207 drm->mode_config.min_height = MXSFB_MIN_YRES; 208 drm->mode_config.max_width = MXSFB_MAX_XRES; 209 drm->mode_config.max_height = MXSFB_MAX_YRES; 210 drm->mode_config.funcs = &mxsfb_mode_config_funcs; 211 212 drm_mode_config_reset(drm); 213 214 pm_runtime_get_sync(drm->dev); 215 ret = drm_irq_install(drm, platform_get_irq(pdev, 0)); 216 pm_runtime_put_sync(drm->dev); 217 218 if (ret < 0) { 219 dev_err(drm->dev, "Failed to install IRQ handler\n"); 220 goto err_irq; 221 } 222 223 drm_kms_helper_poll_init(drm); 224 225 mxsfb->fbdev = drm_fbdev_cma_init(drm, 32, 226 drm->mode_config.num_connector); 227 if (IS_ERR(mxsfb->fbdev)) { 228 ret = PTR_ERR(mxsfb->fbdev); 229 mxsfb->fbdev = NULL; 230 dev_err(drm->dev, "Failed to init FB CMA area\n"); 231 goto err_cma; 232 } 233 234 platform_set_drvdata(pdev, drm); 235 236 drm_helper_hpd_irq_event(drm); 237 238 return 0; 239 240 err_cma: 241 drm_irq_uninstall(drm); 242 err_irq: 243 drm_panel_detach(mxsfb->panel); 244 err_vblank: 245 pm_runtime_disable(drm->dev); 246 247 return ret; 248 } 249 250 static void mxsfb_unload(struct drm_device *drm) 251 { 252 struct mxsfb_drm_private *mxsfb = drm->dev_private; 253 254 if (mxsfb->fbdev) 255 drm_fbdev_cma_fini(mxsfb->fbdev); 256 257 drm_kms_helper_poll_fini(drm); 258 drm_mode_config_cleanup(drm); 259 drm_vblank_cleanup(drm); 260 261 pm_runtime_get_sync(drm->dev); 262 drm_irq_uninstall(drm); 263 pm_runtime_put_sync(drm->dev); 264 265 drm->dev_private = NULL; 266 267 pm_runtime_disable(drm->dev); 268 } 269 270 static void mxsfb_lastclose(struct drm_device *drm) 271 { 272 struct mxsfb_drm_private *mxsfb = drm->dev_private; 273 274 drm_fbdev_cma_restore_mode(mxsfb->fbdev); 275 } 276 277 static int mxsfb_enable_vblank(struct drm_device *drm, unsigned int crtc) 278 { 279 struct mxsfb_drm_private *mxsfb = drm->dev_private; 280 281 /* Clear and enable VBLANK IRQ */ 282 mxsfb_enable_axi_clk(mxsfb); 283 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 284 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_SET); 285 mxsfb_disable_axi_clk(mxsfb); 286 287 return 0; 288 } 289 290 static void mxsfb_disable_vblank(struct drm_device *drm, unsigned int crtc) 291 { 292 struct mxsfb_drm_private *mxsfb = drm->dev_private; 293 294 /* Disable and clear VBLANK IRQ */ 295 mxsfb_enable_axi_clk(mxsfb); 296 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR); 297 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 298 mxsfb_disable_axi_clk(mxsfb); 299 } 300 301 static void mxsfb_irq_preinstall(struct drm_device *drm) 302 { 303 mxsfb_disable_vblank(drm, 0); 304 } 305 306 static irqreturn_t mxsfb_irq_handler(int irq, void *data) 307 { 308 struct drm_device *drm = data; 309 struct mxsfb_drm_private *mxsfb = drm->dev_private; 310 u32 reg; 311 312 mxsfb_enable_axi_clk(mxsfb); 313 314 reg = readl(mxsfb->base + LCDC_CTRL1); 315 316 if (reg & CTRL1_CUR_FRAME_DONE_IRQ) 317 drm_crtc_handle_vblank(&mxsfb->pipe.crtc); 318 319 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 320 321 mxsfb_disable_axi_clk(mxsfb); 322 323 return IRQ_HANDLED; 324 } 325 326 DEFINE_DRM_GEM_CMA_FOPS(fops); 327 328 static struct drm_driver mxsfb_driver = { 329 .driver_features = DRIVER_GEM | DRIVER_MODESET | 330 DRIVER_PRIME | DRIVER_ATOMIC | 331 DRIVER_HAVE_IRQ, 332 .lastclose = mxsfb_lastclose, 333 .irq_handler = mxsfb_irq_handler, 334 .irq_preinstall = mxsfb_irq_preinstall, 335 .irq_uninstall = mxsfb_irq_preinstall, 336 .enable_vblank = mxsfb_enable_vblank, 337 .disable_vblank = mxsfb_disable_vblank, 338 .gem_free_object = drm_gem_cma_free_object, 339 .gem_vm_ops = &drm_gem_cma_vm_ops, 340 .dumb_create = drm_gem_cma_dumb_create, 341 .dumb_map_offset = drm_gem_cma_dumb_map_offset, 342 .dumb_destroy = drm_gem_dumb_destroy, 343 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 344 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 345 .gem_prime_export = drm_gem_prime_export, 346 .gem_prime_import = drm_gem_prime_import, 347 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 348 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 349 .gem_prime_vmap = drm_gem_cma_prime_vmap, 350 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 351 .gem_prime_mmap = drm_gem_cma_prime_mmap, 352 .fops = &fops, 353 .name = "mxsfb-drm", 354 .desc = "MXSFB Controller DRM", 355 .date = "20160824", 356 .major = 1, 357 .minor = 0, 358 }; 359 360 static const struct platform_device_id mxsfb_devtype[] = { 361 { .name = "imx23-fb", .driver_data = MXSFB_V3, }, 362 { .name = "imx28-fb", .driver_data = MXSFB_V4, }, 363 { .name = "imx6sx-fb", .driver_data = MXSFB_V4, }, 364 { /* sentinel */ } 365 }; 366 MODULE_DEVICE_TABLE(platform, mxsfb_devtype); 367 368 static const struct of_device_id mxsfb_dt_ids[] = { 369 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], }, 370 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], }, 371 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devtype[2], }, 372 { /* sentinel */ } 373 }; 374 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids); 375 376 static int mxsfb_probe(struct platform_device *pdev) 377 { 378 struct drm_device *drm; 379 const struct of_device_id *of_id = 380 of_match_device(mxsfb_dt_ids, &pdev->dev); 381 int ret; 382 383 if (!pdev->dev.of_node) 384 return -ENODEV; 385 386 if (of_id) 387 pdev->id_entry = of_id->data; 388 389 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev); 390 if (IS_ERR(drm)) 391 return PTR_ERR(drm); 392 393 ret = mxsfb_load(drm, 0); 394 if (ret) 395 goto err_free; 396 397 ret = drm_dev_register(drm, 0); 398 if (ret) 399 goto err_unload; 400 401 return 0; 402 403 err_unload: 404 mxsfb_unload(drm); 405 err_free: 406 drm_dev_unref(drm); 407 408 return ret; 409 } 410 411 static int mxsfb_remove(struct platform_device *pdev) 412 { 413 struct drm_device *drm = platform_get_drvdata(pdev); 414 415 drm_dev_unregister(drm); 416 mxsfb_unload(drm); 417 drm_dev_unref(drm); 418 419 return 0; 420 } 421 422 static struct platform_driver mxsfb_platform_driver = { 423 .probe = mxsfb_probe, 424 .remove = mxsfb_remove, 425 .id_table = mxsfb_devtype, 426 .driver = { 427 .name = "mxsfb", 428 .of_match_table = mxsfb_dt_ids, 429 }, 430 }; 431 432 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