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_of.h> 29 #include <drm/drm_probe_helper.h> 30 #include <drm/drm_vblank.h> 31 32 #include "mxsfb_drv.h" 33 #include "mxsfb_regs.h" 34 35 enum mxsfb_devtype { 36 MXSFB_V3, 37 MXSFB_V4, 38 /* 39 * Starting at i.MX6 the hardware version register is gone, use the 40 * i.MX family number as the version. 41 */ 42 MXSFB_V6, 43 }; 44 45 static const struct mxsfb_devdata mxsfb_devdata[] = { 46 [MXSFB_V3] = { 47 .transfer_count = LCDC_V3_TRANSFER_COUNT, 48 .cur_buf = LCDC_V3_CUR_BUF, 49 .next_buf = LCDC_V3_NEXT_BUF, 50 .hs_wdth_mask = 0xff, 51 .hs_wdth_shift = 24, 52 .has_overlay = false, 53 .has_ctrl2 = false, 54 }, 55 [MXSFB_V4] = { 56 .transfer_count = LCDC_V4_TRANSFER_COUNT, 57 .cur_buf = LCDC_V4_CUR_BUF, 58 .next_buf = LCDC_V4_NEXT_BUF, 59 .hs_wdth_mask = 0x3fff, 60 .hs_wdth_shift = 18, 61 .has_overlay = false, 62 .has_ctrl2 = true, 63 }, 64 [MXSFB_V6] = { 65 .transfer_count = LCDC_V4_TRANSFER_COUNT, 66 .cur_buf = LCDC_V4_CUR_BUF, 67 .next_buf = LCDC_V4_NEXT_BUF, 68 .hs_wdth_mask = 0x3fff, 69 .hs_wdth_shift = 18, 70 .has_overlay = true, 71 .has_ctrl2 = true, 72 }, 73 }; 74 75 void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb) 76 { 77 if (mxsfb->clk_axi) 78 clk_prepare_enable(mxsfb->clk_axi); 79 } 80 81 void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb) 82 { 83 if (mxsfb->clk_axi) 84 clk_disable_unprepare(mxsfb->clk_axi); 85 } 86 87 static struct drm_framebuffer * 88 mxsfb_fb_create(struct drm_device *dev, struct drm_file *file_priv, 89 const struct drm_mode_fb_cmd2 *mode_cmd) 90 { 91 const struct drm_format_info *info; 92 93 info = drm_get_format_info(dev, mode_cmd); 94 if (!info) 95 return ERR_PTR(-EINVAL); 96 97 if (mode_cmd->width * info->cpp[0] != mode_cmd->pitches[0]) { 98 dev_dbg(dev->dev, "Invalid pitch: fb width must match pitch\n"); 99 return ERR_PTR(-EINVAL); 100 } 101 102 return drm_gem_fb_create(dev, file_priv, mode_cmd); 103 } 104 105 static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = { 106 .fb_create = mxsfb_fb_create, 107 .atomic_check = drm_atomic_helper_check, 108 .atomic_commit = drm_atomic_helper_commit, 109 }; 110 111 static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = { 112 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 113 }; 114 115 static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb) 116 { 117 struct drm_device *drm = mxsfb->drm; 118 struct drm_connector_list_iter iter; 119 struct drm_panel *panel; 120 struct drm_bridge *bridge; 121 int ret; 122 123 ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel, 124 &bridge); 125 if (ret) 126 return ret; 127 128 if (panel) { 129 bridge = devm_drm_panel_bridge_add_typed(drm->dev, panel, 130 DRM_MODE_CONNECTOR_DPI); 131 if (IS_ERR(bridge)) 132 return PTR_ERR(bridge); 133 } 134 135 if (!bridge) 136 return -ENODEV; 137 138 ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0); 139 if (ret) 140 return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n"); 141 142 mxsfb->bridge = bridge; 143 144 /* 145 * Get hold of the connector. This is a bit of a hack, until the bridge 146 * API gives us bus flags and formats. 147 */ 148 drm_connector_list_iter_begin(drm, &iter); 149 mxsfb->connector = drm_connector_list_iter_next(&iter); 150 drm_connector_list_iter_end(&iter); 151 152 return 0; 153 } 154 155 static irqreturn_t mxsfb_irq_handler(int irq, void *data) 156 { 157 struct drm_device *drm = data; 158 struct mxsfb_drm_private *mxsfb = drm->dev_private; 159 u32 reg; 160 161 reg = readl(mxsfb->base + LCDC_CTRL1); 162 163 if (reg & CTRL1_CUR_FRAME_DONE_IRQ) 164 drm_crtc_handle_vblank(&mxsfb->crtc); 165 166 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 167 168 return IRQ_HANDLED; 169 } 170 171 static void mxsfb_irq_disable(struct drm_device *drm) 172 { 173 struct mxsfb_drm_private *mxsfb = drm->dev_private; 174 175 mxsfb_enable_axi_clk(mxsfb); 176 mxsfb->crtc.funcs->disable_vblank(&mxsfb->crtc); 177 mxsfb_disable_axi_clk(mxsfb); 178 } 179 180 static int mxsfb_irq_install(struct drm_device *dev, int irq) 181 { 182 if (irq == IRQ_NOTCONNECTED) 183 return -ENOTCONN; 184 185 mxsfb_irq_disable(dev); 186 187 return request_irq(irq, mxsfb_irq_handler, 0, dev->driver->name, dev); 188 } 189 190 static void mxsfb_irq_uninstall(struct drm_device *dev) 191 { 192 struct mxsfb_drm_private *mxsfb = dev->dev_private; 193 194 mxsfb_irq_disable(dev); 195 free_irq(mxsfb->irq, dev); 196 } 197 198 static int mxsfb_load(struct drm_device *drm, 199 const struct mxsfb_devdata *devdata) 200 { 201 struct platform_device *pdev = to_platform_device(drm->dev); 202 struct mxsfb_drm_private *mxsfb; 203 struct resource *res; 204 int ret; 205 206 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL); 207 if (!mxsfb) 208 return -ENOMEM; 209 210 mxsfb->drm = drm; 211 drm->dev_private = mxsfb; 212 mxsfb->devdata = devdata; 213 214 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 215 mxsfb->base = devm_ioremap_resource(drm->dev, res); 216 if (IS_ERR(mxsfb->base)) 217 return PTR_ERR(mxsfb->base); 218 219 mxsfb->clk = devm_clk_get(drm->dev, NULL); 220 if (IS_ERR(mxsfb->clk)) 221 return PTR_ERR(mxsfb->clk); 222 223 mxsfb->clk_axi = devm_clk_get(drm->dev, "axi"); 224 if (IS_ERR(mxsfb->clk_axi)) 225 mxsfb->clk_axi = NULL; 226 227 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi"); 228 if (IS_ERR(mxsfb->clk_disp_axi)) 229 mxsfb->clk_disp_axi = NULL; 230 231 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); 232 if (ret) 233 return ret; 234 235 pm_runtime_enable(drm->dev); 236 237 /* Modeset init */ 238 drm_mode_config_init(drm); 239 240 ret = mxsfb_kms_init(mxsfb); 241 if (ret < 0) { 242 dev_err(drm->dev, "Failed to initialize KMS pipeline\n"); 243 goto err_vblank; 244 } 245 246 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 247 if (ret < 0) { 248 dev_err(drm->dev, "Failed to initialise vblank\n"); 249 goto err_vblank; 250 } 251 252 /* Start with vertical blanking interrupt reporting disabled. */ 253 drm_crtc_vblank_off(&mxsfb->crtc); 254 255 ret = mxsfb_attach_bridge(mxsfb); 256 if (ret) { 257 if (ret != -EPROBE_DEFER) 258 dev_err(drm->dev, "Cannot connect bridge: %d\n", ret); 259 goto err_vblank; 260 } 261 262 drm->mode_config.min_width = MXSFB_MIN_XRES; 263 drm->mode_config.min_height = MXSFB_MIN_YRES; 264 drm->mode_config.max_width = MXSFB_MAX_XRES; 265 drm->mode_config.max_height = MXSFB_MAX_YRES; 266 drm->mode_config.funcs = &mxsfb_mode_config_funcs; 267 drm->mode_config.helper_private = &mxsfb_mode_config_helpers; 268 269 drm_mode_config_reset(drm); 270 271 ret = platform_get_irq(pdev, 0); 272 if (ret < 0) 273 goto err_vblank; 274 mxsfb->irq = ret; 275 276 pm_runtime_get_sync(drm->dev); 277 ret = mxsfb_irq_install(drm, mxsfb->irq); 278 pm_runtime_put_sync(drm->dev); 279 280 if (ret < 0) { 281 dev_err(drm->dev, "Failed to install IRQ handler\n"); 282 goto err_vblank; 283 } 284 285 drm_kms_helper_poll_init(drm); 286 287 platform_set_drvdata(pdev, drm); 288 289 drm_helper_hpd_irq_event(drm); 290 291 return 0; 292 293 err_vblank: 294 pm_runtime_disable(drm->dev); 295 296 return ret; 297 } 298 299 static void mxsfb_unload(struct drm_device *drm) 300 { 301 drm_kms_helper_poll_fini(drm); 302 drm_mode_config_cleanup(drm); 303 304 pm_runtime_get_sync(drm->dev); 305 mxsfb_irq_uninstall(drm); 306 pm_runtime_put_sync(drm->dev); 307 308 drm->dev_private = NULL; 309 310 pm_runtime_disable(drm->dev); 311 } 312 313 DEFINE_DRM_GEM_CMA_FOPS(fops); 314 315 static const struct drm_driver mxsfb_driver = { 316 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 317 DRM_GEM_CMA_DRIVER_OPS, 318 .fops = &fops, 319 .name = "mxsfb-drm", 320 .desc = "MXSFB Controller DRM", 321 .date = "20160824", 322 .major = 1, 323 .minor = 0, 324 }; 325 326 static const struct of_device_id mxsfb_dt_ids[] = { 327 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devdata[MXSFB_V3], }, 328 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devdata[MXSFB_V4], }, 329 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devdata[MXSFB_V6], }, 330 { /* sentinel */ } 331 }; 332 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids); 333 334 static int mxsfb_probe(struct platform_device *pdev) 335 { 336 struct drm_device *drm; 337 const struct of_device_id *of_id = 338 of_match_device(mxsfb_dt_ids, &pdev->dev); 339 int ret; 340 341 if (!pdev->dev.of_node) 342 return -ENODEV; 343 344 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev); 345 if (IS_ERR(drm)) 346 return PTR_ERR(drm); 347 348 ret = mxsfb_load(drm, of_id->data); 349 if (ret) 350 goto err_free; 351 352 ret = drm_dev_register(drm, 0); 353 if (ret) 354 goto err_unload; 355 356 drm_fbdev_generic_setup(drm, 32); 357 358 return 0; 359 360 err_unload: 361 mxsfb_unload(drm); 362 err_free: 363 drm_dev_put(drm); 364 365 return ret; 366 } 367 368 static int mxsfb_remove(struct platform_device *pdev) 369 { 370 struct drm_device *drm = platform_get_drvdata(pdev); 371 372 drm_dev_unregister(drm); 373 mxsfb_unload(drm); 374 drm_dev_put(drm); 375 376 return 0; 377 } 378 379 #ifdef CONFIG_PM_SLEEP 380 static int mxsfb_suspend(struct device *dev) 381 { 382 struct drm_device *drm = dev_get_drvdata(dev); 383 384 return drm_mode_config_helper_suspend(drm); 385 } 386 387 static int mxsfb_resume(struct device *dev) 388 { 389 struct drm_device *drm = dev_get_drvdata(dev); 390 391 return drm_mode_config_helper_resume(drm); 392 } 393 #endif 394 395 static const struct dev_pm_ops mxsfb_pm_ops = { 396 SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume) 397 }; 398 399 static struct platform_driver mxsfb_platform_driver = { 400 .probe = mxsfb_probe, 401 .remove = mxsfb_remove, 402 .driver = { 403 .name = "mxsfb", 404 .of_match_table = mxsfb_dt_ids, 405 .pm = &mxsfb_pm_ops, 406 }, 407 }; 408 409 module_platform_driver(mxsfb_platform_driver); 410 411 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 412 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver"); 413 MODULE_LICENSE("GPL"); 414