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 { 104 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 105 106 drm_panel_prepare(mxsfb->panel); 107 mxsfb_crtc_enable(mxsfb); 108 drm_panel_enable(mxsfb->panel); 109 } 110 111 static void mxsfb_pipe_disable(struct drm_simple_display_pipe *pipe) 112 { 113 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 114 115 drm_panel_disable(mxsfb->panel); 116 mxsfb_crtc_disable(mxsfb); 117 drm_panel_unprepare(mxsfb->panel); 118 } 119 120 static void mxsfb_pipe_update(struct drm_simple_display_pipe *pipe, 121 struct drm_plane_state *plane_state) 122 { 123 struct mxsfb_drm_private *mxsfb = drm_pipe_to_mxsfb_drm_private(pipe); 124 125 mxsfb_plane_atomic_update(mxsfb, plane_state); 126 } 127 128 static int mxsfb_pipe_prepare_fb(struct drm_simple_display_pipe *pipe, 129 struct drm_plane_state *plane_state) 130 { 131 return drm_gem_fb_prepare_fb(&pipe->plane, plane_state); 132 } 133 134 static struct drm_simple_display_pipe_funcs mxsfb_funcs = { 135 .enable = mxsfb_pipe_enable, 136 .disable = mxsfb_pipe_disable, 137 .update = mxsfb_pipe_update, 138 .prepare_fb = mxsfb_pipe_prepare_fb, 139 }; 140 141 static int mxsfb_load(struct drm_device *drm, unsigned long flags) 142 { 143 struct platform_device *pdev = to_platform_device(drm->dev); 144 struct mxsfb_drm_private *mxsfb; 145 struct resource *res; 146 int ret; 147 148 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL); 149 if (!mxsfb) 150 return -ENOMEM; 151 152 drm->dev_private = mxsfb; 153 mxsfb->devdata = &mxsfb_devdata[pdev->id_entry->driver_data]; 154 155 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 156 mxsfb->base = devm_ioremap_resource(drm->dev, res); 157 if (IS_ERR(mxsfb->base)) 158 return PTR_ERR(mxsfb->base); 159 160 mxsfb->clk = devm_clk_get(drm->dev, NULL); 161 if (IS_ERR(mxsfb->clk)) 162 return PTR_ERR(mxsfb->clk); 163 164 mxsfb->clk_axi = devm_clk_get(drm->dev, "axi"); 165 if (IS_ERR(mxsfb->clk_axi)) 166 mxsfb->clk_axi = NULL; 167 168 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi"); 169 if (IS_ERR(mxsfb->clk_disp_axi)) 170 mxsfb->clk_disp_axi = NULL; 171 172 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); 173 if (ret) 174 return ret; 175 176 pm_runtime_enable(drm->dev); 177 178 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 179 if (ret < 0) { 180 dev_err(drm->dev, "Failed to initialise vblank\n"); 181 goto err_vblank; 182 } 183 184 /* Modeset init */ 185 drm_mode_config_init(drm); 186 187 ret = mxsfb_create_output(drm); 188 if (ret < 0) { 189 dev_err(drm->dev, "Failed to create outputs\n"); 190 goto err_vblank; 191 } 192 193 ret = drm_simple_display_pipe_init(drm, &mxsfb->pipe, &mxsfb_funcs, 194 mxsfb_formats, ARRAY_SIZE(mxsfb_formats), NULL, 195 &mxsfb->connector); 196 if (ret < 0) { 197 dev_err(drm->dev, "Cannot setup simple display pipe\n"); 198 goto err_vblank; 199 } 200 201 ret = drm_panel_attach(mxsfb->panel, &mxsfb->connector); 202 if (ret) { 203 dev_err(drm->dev, "Cannot connect panel\n"); 204 goto err_vblank; 205 } 206 207 drm->mode_config.min_width = MXSFB_MIN_XRES; 208 drm->mode_config.min_height = MXSFB_MIN_YRES; 209 drm->mode_config.max_width = MXSFB_MAX_XRES; 210 drm->mode_config.max_height = MXSFB_MAX_YRES; 211 drm->mode_config.funcs = &mxsfb_mode_config_funcs; 212 213 drm_mode_config_reset(drm); 214 215 pm_runtime_get_sync(drm->dev); 216 ret = drm_irq_install(drm, platform_get_irq(pdev, 0)); 217 pm_runtime_put_sync(drm->dev); 218 219 if (ret < 0) { 220 dev_err(drm->dev, "Failed to install IRQ handler\n"); 221 goto err_irq; 222 } 223 224 drm_kms_helper_poll_init(drm); 225 226 mxsfb->fbdev = drm_fbdev_cma_init(drm, 32, 227 drm->mode_config.num_connector); 228 if (IS_ERR(mxsfb->fbdev)) { 229 ret = PTR_ERR(mxsfb->fbdev); 230 mxsfb->fbdev = NULL; 231 dev_err(drm->dev, "Failed to init FB CMA area\n"); 232 goto err_cma; 233 } 234 235 platform_set_drvdata(pdev, drm); 236 237 drm_helper_hpd_irq_event(drm); 238 239 return 0; 240 241 err_cma: 242 drm_irq_uninstall(drm); 243 err_irq: 244 drm_panel_detach(mxsfb->panel); 245 err_vblank: 246 pm_runtime_disable(drm->dev); 247 248 return ret; 249 } 250 251 static void mxsfb_unload(struct drm_device *drm) 252 { 253 struct mxsfb_drm_private *mxsfb = drm->dev_private; 254 255 if (mxsfb->fbdev) 256 drm_fbdev_cma_fini(mxsfb->fbdev); 257 258 drm_kms_helper_poll_fini(drm); 259 drm_mode_config_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_unlocked = drm_gem_cma_free_object, 339 .gem_vm_ops = &drm_gem_cma_vm_ops, 340 .dumb_create = drm_gem_cma_dumb_create, 341 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 342 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 343 .gem_prime_export = drm_gem_prime_export, 344 .gem_prime_import = drm_gem_prime_import, 345 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 346 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 347 .gem_prime_vmap = drm_gem_cma_prime_vmap, 348 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 349 .gem_prime_mmap = drm_gem_cma_prime_mmap, 350 .fops = &fops, 351 .name = "mxsfb-drm", 352 .desc = "MXSFB Controller DRM", 353 .date = "20160824", 354 .major = 1, 355 .minor = 0, 356 }; 357 358 static const struct platform_device_id mxsfb_devtype[] = { 359 { .name = "imx23-fb", .driver_data = MXSFB_V3, }, 360 { .name = "imx28-fb", .driver_data = MXSFB_V4, }, 361 { .name = "imx6sx-fb", .driver_data = MXSFB_V4, }, 362 { /* sentinel */ } 363 }; 364 MODULE_DEVICE_TABLE(platform, mxsfb_devtype); 365 366 static const struct of_device_id mxsfb_dt_ids[] = { 367 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devtype[0], }, 368 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devtype[1], }, 369 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devtype[2], }, 370 { /* sentinel */ } 371 }; 372 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids); 373 374 static int mxsfb_probe(struct platform_device *pdev) 375 { 376 struct drm_device *drm; 377 const struct of_device_id *of_id = 378 of_match_device(mxsfb_dt_ids, &pdev->dev); 379 int ret; 380 381 if (!pdev->dev.of_node) 382 return -ENODEV; 383 384 if (of_id) 385 pdev->id_entry = of_id->data; 386 387 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev); 388 if (IS_ERR(drm)) 389 return PTR_ERR(drm); 390 391 ret = mxsfb_load(drm, 0); 392 if (ret) 393 goto err_free; 394 395 ret = drm_dev_register(drm, 0); 396 if (ret) 397 goto err_unload; 398 399 return 0; 400 401 err_unload: 402 mxsfb_unload(drm); 403 err_free: 404 drm_dev_unref(drm); 405 406 return ret; 407 } 408 409 static int mxsfb_remove(struct platform_device *pdev) 410 { 411 struct drm_device *drm = platform_get_drvdata(pdev); 412 413 drm_dev_unregister(drm); 414 mxsfb_unload(drm); 415 drm_dev_unref(drm); 416 417 return 0; 418 } 419 420 static struct platform_driver mxsfb_platform_driver = { 421 .probe = mxsfb_probe, 422 .remove = mxsfb_remove, 423 .id_table = mxsfb_devtype, 424 .driver = { 425 .name = "mxsfb", 426 .of_match_table = mxsfb_dt_ids, 427 }, 428 }; 429 430 module_platform_driver(mxsfb_platform_driver); 431 432 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 433 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver"); 434 MODULE_LICENSE("GPL"); 435