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_fb_helper.h> 24 #include <drm/drm_fourcc.h> 25 #include <drm/drm_gem_cma_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 }, 56 [MXSFB_V4] = { 57 .transfer_count = LCDC_V4_TRANSFER_COUNT, 58 .cur_buf = LCDC_V4_CUR_BUF, 59 .next_buf = LCDC_V4_NEXT_BUF, 60 .hs_wdth_mask = 0x3fff, 61 .hs_wdth_shift = 18, 62 .has_overlay = false, 63 .has_ctrl2 = true, 64 }, 65 [MXSFB_V6] = { 66 .transfer_count = LCDC_V4_TRANSFER_COUNT, 67 .cur_buf = LCDC_V4_CUR_BUF, 68 .next_buf = LCDC_V4_NEXT_BUF, 69 .hs_wdth_mask = 0x3fff, 70 .hs_wdth_shift = 18, 71 .has_overlay = true, 72 .has_ctrl2 = true, 73 }, 74 }; 75 76 void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb) 77 { 78 if (mxsfb->clk_axi) 79 clk_prepare_enable(mxsfb->clk_axi); 80 } 81 82 void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb) 83 { 84 if (mxsfb->clk_axi) 85 clk_disable_unprepare(mxsfb->clk_axi); 86 } 87 88 static struct drm_framebuffer * 89 mxsfb_fb_create(struct drm_device *dev, struct drm_file *file_priv, 90 const struct drm_mode_fb_cmd2 *mode_cmd) 91 { 92 const struct drm_format_info *info; 93 94 info = drm_get_format_info(dev, mode_cmd); 95 if (!info) 96 return ERR_PTR(-EINVAL); 97 98 if (mode_cmd->width * info->cpp[0] != mode_cmd->pitches[0]) { 99 dev_dbg(dev->dev, "Invalid pitch: fb width must match pitch\n"); 100 return ERR_PTR(-EINVAL); 101 } 102 103 return drm_gem_fb_create(dev, file_priv, mode_cmd); 104 } 105 106 static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = { 107 .fb_create = mxsfb_fb_create, 108 .atomic_check = drm_atomic_helper_check, 109 .atomic_commit = drm_atomic_helper_commit, 110 }; 111 112 static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = { 113 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 114 }; 115 116 static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb) 117 { 118 struct drm_device *drm = mxsfb->drm; 119 struct drm_connector_list_iter iter; 120 struct drm_panel *panel; 121 struct drm_bridge *bridge; 122 int ret; 123 124 ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel, 125 &bridge); 126 if (ret) 127 return ret; 128 129 if (panel) { 130 bridge = devm_drm_panel_bridge_add_typed(drm->dev, panel, 131 DRM_MODE_CONNECTOR_DPI); 132 if (IS_ERR(bridge)) 133 return PTR_ERR(bridge); 134 } 135 136 if (!bridge) 137 return -ENODEV; 138 139 ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0); 140 if (ret) 141 return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n"); 142 143 mxsfb->bridge = bridge; 144 145 /* 146 * Get hold of the connector. This is a bit of a hack, until the bridge 147 * API gives us bus flags and formats. 148 */ 149 drm_connector_list_iter_begin(drm, &iter); 150 mxsfb->connector = drm_connector_list_iter_next(&iter); 151 drm_connector_list_iter_end(&iter); 152 153 return 0; 154 } 155 156 static irqreturn_t mxsfb_irq_handler(int irq, void *data) 157 { 158 struct drm_device *drm = data; 159 struct mxsfb_drm_private *mxsfb = drm->dev_private; 160 u32 reg; 161 162 reg = readl(mxsfb->base + LCDC_CTRL1); 163 164 if (reg & CTRL1_CUR_FRAME_DONE_IRQ) 165 drm_crtc_handle_vblank(&mxsfb->crtc); 166 167 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 168 169 return IRQ_HANDLED; 170 } 171 172 static void mxsfb_irq_disable(struct drm_device *drm) 173 { 174 struct mxsfb_drm_private *mxsfb = drm->dev_private; 175 176 mxsfb_enable_axi_clk(mxsfb); 177 178 /* Disable and clear VBLANK IRQ */ 179 writel(CTRL1_CUR_FRAME_DONE_IRQ_EN, mxsfb->base + LCDC_CTRL1 + REG_CLR); 180 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 181 182 mxsfb_disable_axi_clk(mxsfb); 183 } 184 185 static int mxsfb_irq_install(struct drm_device *dev, int irq) 186 { 187 if (irq == IRQ_NOTCONNECTED) 188 return -ENOTCONN; 189 190 mxsfb_irq_disable(dev); 191 192 return request_irq(irq, mxsfb_irq_handler, 0, dev->driver->name, dev); 193 } 194 195 static void mxsfb_irq_uninstall(struct drm_device *dev) 196 { 197 struct mxsfb_drm_private *mxsfb = dev->dev_private; 198 199 mxsfb_irq_disable(dev); 200 free_irq(mxsfb->irq, dev); 201 } 202 203 static int mxsfb_load(struct drm_device *drm, 204 const struct mxsfb_devdata *devdata) 205 { 206 struct platform_device *pdev = to_platform_device(drm->dev); 207 struct mxsfb_drm_private *mxsfb; 208 struct resource *res; 209 int ret; 210 211 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL); 212 if (!mxsfb) 213 return -ENOMEM; 214 215 mxsfb->drm = drm; 216 drm->dev_private = mxsfb; 217 mxsfb->devdata = devdata; 218 219 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 220 mxsfb->base = devm_ioremap_resource(drm->dev, res); 221 if (IS_ERR(mxsfb->base)) 222 return PTR_ERR(mxsfb->base); 223 224 mxsfb->clk = devm_clk_get(drm->dev, NULL); 225 if (IS_ERR(mxsfb->clk)) 226 return PTR_ERR(mxsfb->clk); 227 228 mxsfb->clk_axi = devm_clk_get(drm->dev, "axi"); 229 if (IS_ERR(mxsfb->clk_axi)) 230 mxsfb->clk_axi = NULL; 231 232 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi"); 233 if (IS_ERR(mxsfb->clk_disp_axi)) 234 mxsfb->clk_disp_axi = NULL; 235 236 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); 237 if (ret) 238 return ret; 239 240 pm_runtime_enable(drm->dev); 241 242 /* Modeset init */ 243 drm_mode_config_init(drm); 244 245 ret = mxsfb_kms_init(mxsfb); 246 if (ret < 0) { 247 dev_err(drm->dev, "Failed to initialize KMS pipeline\n"); 248 goto err_vblank; 249 } 250 251 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 252 if (ret < 0) { 253 dev_err(drm->dev, "Failed to initialise vblank\n"); 254 goto err_vblank; 255 } 256 257 /* Start with vertical blanking interrupt reporting disabled. */ 258 drm_crtc_vblank_off(&mxsfb->crtc); 259 260 ret = mxsfb_attach_bridge(mxsfb); 261 if (ret) { 262 dev_err_probe(drm->dev, ret, "Cannot connect bridge\n"); 263 goto err_vblank; 264 } 265 266 drm->mode_config.min_width = MXSFB_MIN_XRES; 267 drm->mode_config.min_height = MXSFB_MIN_YRES; 268 drm->mode_config.max_width = MXSFB_MAX_XRES; 269 drm->mode_config.max_height = MXSFB_MAX_YRES; 270 drm->mode_config.funcs = &mxsfb_mode_config_funcs; 271 drm->mode_config.helper_private = &mxsfb_mode_config_helpers; 272 273 drm_mode_config_reset(drm); 274 275 ret = platform_get_irq(pdev, 0); 276 if (ret < 0) 277 goto err_vblank; 278 mxsfb->irq = ret; 279 280 pm_runtime_get_sync(drm->dev); 281 ret = mxsfb_irq_install(drm, mxsfb->irq); 282 pm_runtime_put_sync(drm->dev); 283 284 if (ret < 0) { 285 dev_err(drm->dev, "Failed to install IRQ handler\n"); 286 goto err_vblank; 287 } 288 289 drm_kms_helper_poll_init(drm); 290 291 platform_set_drvdata(pdev, drm); 292 293 drm_helper_hpd_irq_event(drm); 294 295 return 0; 296 297 err_vblank: 298 pm_runtime_disable(drm->dev); 299 300 return ret; 301 } 302 303 static void mxsfb_unload(struct drm_device *drm) 304 { 305 drm_kms_helper_poll_fini(drm); 306 drm_mode_config_cleanup(drm); 307 308 pm_runtime_get_sync(drm->dev); 309 mxsfb_irq_uninstall(drm); 310 pm_runtime_put_sync(drm->dev); 311 312 drm->dev_private = NULL; 313 314 pm_runtime_disable(drm->dev); 315 } 316 317 DEFINE_DRM_GEM_CMA_FOPS(fops); 318 319 static const struct drm_driver mxsfb_driver = { 320 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 321 DRM_GEM_CMA_DRIVER_OPS, 322 .fops = &fops, 323 .name = "mxsfb-drm", 324 .desc = "MXSFB Controller DRM", 325 .date = "20160824", 326 .major = 1, 327 .minor = 0, 328 }; 329 330 static const struct of_device_id mxsfb_dt_ids[] = { 331 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devdata[MXSFB_V3], }, 332 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devdata[MXSFB_V4], }, 333 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devdata[MXSFB_V6], }, 334 { /* sentinel */ } 335 }; 336 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids); 337 338 static int mxsfb_probe(struct platform_device *pdev) 339 { 340 struct drm_device *drm; 341 const struct of_device_id *of_id = 342 of_match_device(mxsfb_dt_ids, &pdev->dev); 343 int ret; 344 345 if (!pdev->dev.of_node) 346 return -ENODEV; 347 348 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev); 349 if (IS_ERR(drm)) 350 return PTR_ERR(drm); 351 352 ret = mxsfb_load(drm, of_id->data); 353 if (ret) 354 goto err_free; 355 356 ret = drm_dev_register(drm, 0); 357 if (ret) 358 goto err_unload; 359 360 drm_fbdev_generic_setup(drm, 32); 361 362 return 0; 363 364 err_unload: 365 mxsfb_unload(drm); 366 err_free: 367 drm_dev_put(drm); 368 369 return ret; 370 } 371 372 static int mxsfb_remove(struct platform_device *pdev) 373 { 374 struct drm_device *drm = platform_get_drvdata(pdev); 375 376 drm_dev_unregister(drm); 377 drm_atomic_helper_shutdown(drm); 378 mxsfb_unload(drm); 379 drm_dev_put(drm); 380 381 return 0; 382 } 383 384 static void mxsfb_shutdown(struct platform_device *pdev) 385 { 386 struct drm_device *drm = platform_get_drvdata(pdev); 387 388 drm_atomic_helper_shutdown(drm); 389 } 390 391 #ifdef CONFIG_PM_SLEEP 392 static int mxsfb_suspend(struct device *dev) 393 { 394 struct drm_device *drm = dev_get_drvdata(dev); 395 396 return drm_mode_config_helper_suspend(drm); 397 } 398 399 static int mxsfb_resume(struct device *dev) 400 { 401 struct drm_device *drm = dev_get_drvdata(dev); 402 403 return drm_mode_config_helper_resume(drm); 404 } 405 #endif 406 407 static const struct dev_pm_ops mxsfb_pm_ops = { 408 SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume) 409 }; 410 411 static struct platform_driver mxsfb_platform_driver = { 412 .probe = mxsfb_probe, 413 .remove = mxsfb_remove, 414 .shutdown = mxsfb_shutdown, 415 .driver = { 416 .name = "mxsfb", 417 .of_match_table = mxsfb_dt_ids, 418 .pm = &mxsfb_pm_ops, 419 }, 420 }; 421 422 drm_module_platform_driver(mxsfb_platform_driver); 423 424 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 425 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver"); 426 MODULE_LICENSE("GPL"); 427