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_irq.h> 28 #include <drm/drm_mode_config.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 }, 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 }, 63 [MXSFB_V6] = { 64 .transfer_count = LCDC_V4_TRANSFER_COUNT, 65 .cur_buf = LCDC_V4_CUR_BUF, 66 .next_buf = LCDC_V4_NEXT_BUF, 67 .hs_wdth_mask = 0x3fff, 68 .hs_wdth_shift = 18, 69 .has_overlay = true, 70 }, 71 }; 72 73 void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb) 74 { 75 if (mxsfb->clk_axi) 76 clk_prepare_enable(mxsfb->clk_axi); 77 } 78 79 void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb) 80 { 81 if (mxsfb->clk_axi) 82 clk_disable_unprepare(mxsfb->clk_axi); 83 } 84 85 static struct drm_framebuffer * 86 mxsfb_fb_create(struct drm_device *dev, struct drm_file *file_priv, 87 const struct drm_mode_fb_cmd2 *mode_cmd) 88 { 89 const struct drm_format_info *info; 90 91 info = drm_get_format_info(dev, mode_cmd); 92 if (!info) 93 return ERR_PTR(-EINVAL); 94 95 if (mode_cmd->width * info->cpp[0] != mode_cmd->pitches[0]) { 96 dev_dbg(dev->dev, "Invalid pitch: fb width must match pitch\n"); 97 return ERR_PTR(-EINVAL); 98 } 99 100 return drm_gem_fb_create(dev, file_priv, mode_cmd); 101 } 102 103 static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = { 104 .fb_create = mxsfb_fb_create, 105 .atomic_check = drm_atomic_helper_check, 106 .atomic_commit = drm_atomic_helper_commit, 107 }; 108 109 static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = { 110 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 111 }; 112 113 static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb) 114 { 115 struct drm_device *drm = mxsfb->drm; 116 struct drm_connector_list_iter iter; 117 struct drm_panel *panel; 118 struct drm_bridge *bridge; 119 int ret; 120 121 ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel, 122 &bridge); 123 if (ret) 124 return ret; 125 126 if (panel) { 127 bridge = devm_drm_panel_bridge_add_typed(drm->dev, panel, 128 DRM_MODE_CONNECTOR_DPI); 129 if (IS_ERR(bridge)) 130 return PTR_ERR(bridge); 131 } 132 133 if (!bridge) 134 return -ENODEV; 135 136 ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0); 137 if (ret) 138 return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n"); 139 140 mxsfb->bridge = bridge; 141 142 /* 143 * Get hold of the connector. This is a bit of a hack, until the bridge 144 * API gives us bus flags and formats. 145 */ 146 drm_connector_list_iter_begin(drm, &iter); 147 mxsfb->connector = drm_connector_list_iter_next(&iter); 148 drm_connector_list_iter_end(&iter); 149 150 return 0; 151 } 152 153 static int mxsfb_load(struct drm_device *drm, 154 const struct mxsfb_devdata *devdata) 155 { 156 struct platform_device *pdev = to_platform_device(drm->dev); 157 struct mxsfb_drm_private *mxsfb; 158 struct resource *res; 159 int ret; 160 161 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL); 162 if (!mxsfb) 163 return -ENOMEM; 164 165 mxsfb->drm = drm; 166 drm->dev_private = mxsfb; 167 mxsfb->devdata = devdata; 168 169 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 170 mxsfb->base = devm_ioremap_resource(drm->dev, res); 171 if (IS_ERR(mxsfb->base)) 172 return PTR_ERR(mxsfb->base); 173 174 mxsfb->clk = devm_clk_get(drm->dev, NULL); 175 if (IS_ERR(mxsfb->clk)) 176 return PTR_ERR(mxsfb->clk); 177 178 mxsfb->clk_axi = devm_clk_get(drm->dev, "axi"); 179 if (IS_ERR(mxsfb->clk_axi)) 180 mxsfb->clk_axi = NULL; 181 182 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi"); 183 if (IS_ERR(mxsfb->clk_disp_axi)) 184 mxsfb->clk_disp_axi = NULL; 185 186 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); 187 if (ret) 188 return ret; 189 190 pm_runtime_enable(drm->dev); 191 192 /* Modeset init */ 193 drm_mode_config_init(drm); 194 195 ret = mxsfb_kms_init(mxsfb); 196 if (ret < 0) { 197 dev_err(drm->dev, "Failed to initialize KMS pipeline\n"); 198 goto err_vblank; 199 } 200 201 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 202 if (ret < 0) { 203 dev_err(drm->dev, "Failed to initialise vblank\n"); 204 goto err_vblank; 205 } 206 207 /* Start with vertical blanking interrupt reporting disabled. */ 208 drm_crtc_vblank_off(&mxsfb->crtc); 209 210 ret = mxsfb_attach_bridge(mxsfb); 211 if (ret) { 212 if (ret != -EPROBE_DEFER) 213 dev_err(drm->dev, "Cannot connect bridge: %d\n", ret); 214 goto err_vblank; 215 } 216 217 drm->mode_config.min_width = MXSFB_MIN_XRES; 218 drm->mode_config.min_height = MXSFB_MIN_YRES; 219 drm->mode_config.max_width = MXSFB_MAX_XRES; 220 drm->mode_config.max_height = MXSFB_MAX_YRES; 221 drm->mode_config.funcs = &mxsfb_mode_config_funcs; 222 drm->mode_config.helper_private = &mxsfb_mode_config_helpers; 223 224 drm_mode_config_reset(drm); 225 226 pm_runtime_get_sync(drm->dev); 227 ret = drm_irq_install(drm, platform_get_irq(pdev, 0)); 228 pm_runtime_put_sync(drm->dev); 229 230 if (ret < 0) { 231 dev_err(drm->dev, "Failed to install IRQ handler\n"); 232 goto err_vblank; 233 } 234 235 drm_kms_helper_poll_init(drm); 236 237 platform_set_drvdata(pdev, drm); 238 239 drm_helper_hpd_irq_event(drm); 240 241 return 0; 242 243 err_vblank: 244 pm_runtime_disable(drm->dev); 245 246 return ret; 247 } 248 249 static void mxsfb_unload(struct drm_device *drm) 250 { 251 drm_kms_helper_poll_fini(drm); 252 drm_mode_config_cleanup(drm); 253 254 pm_runtime_get_sync(drm->dev); 255 drm_irq_uninstall(drm); 256 pm_runtime_put_sync(drm->dev); 257 258 drm->dev_private = NULL; 259 260 pm_runtime_disable(drm->dev); 261 } 262 263 static void mxsfb_irq_disable(struct drm_device *drm) 264 { 265 struct mxsfb_drm_private *mxsfb = drm->dev_private; 266 267 mxsfb_enable_axi_clk(mxsfb); 268 mxsfb->crtc.funcs->disable_vblank(&mxsfb->crtc); 269 mxsfb_disable_axi_clk(mxsfb); 270 } 271 272 static irqreturn_t mxsfb_irq_handler(int irq, void *data) 273 { 274 struct drm_device *drm = data; 275 struct mxsfb_drm_private *mxsfb = drm->dev_private; 276 u32 reg; 277 278 reg = readl(mxsfb->base + LCDC_CTRL1); 279 280 if (reg & CTRL1_CUR_FRAME_DONE_IRQ) 281 drm_crtc_handle_vblank(&mxsfb->crtc); 282 283 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 284 285 return IRQ_HANDLED; 286 } 287 288 DEFINE_DRM_GEM_CMA_FOPS(fops); 289 290 static const struct drm_driver mxsfb_driver = { 291 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 292 .irq_handler = mxsfb_irq_handler, 293 .irq_preinstall = mxsfb_irq_disable, 294 .irq_uninstall = mxsfb_irq_disable, 295 DRM_GEM_CMA_DRIVER_OPS, 296 .fops = &fops, 297 .name = "mxsfb-drm", 298 .desc = "MXSFB Controller DRM", 299 .date = "20160824", 300 .major = 1, 301 .minor = 0, 302 }; 303 304 static const struct of_device_id mxsfb_dt_ids[] = { 305 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devdata[MXSFB_V3], }, 306 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devdata[MXSFB_V4], }, 307 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devdata[MXSFB_V6], }, 308 { /* sentinel */ } 309 }; 310 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids); 311 312 static int mxsfb_probe(struct platform_device *pdev) 313 { 314 struct drm_device *drm; 315 const struct of_device_id *of_id = 316 of_match_device(mxsfb_dt_ids, &pdev->dev); 317 int ret; 318 319 if (!pdev->dev.of_node) 320 return -ENODEV; 321 322 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev); 323 if (IS_ERR(drm)) 324 return PTR_ERR(drm); 325 326 ret = mxsfb_load(drm, of_id->data); 327 if (ret) 328 goto err_free; 329 330 ret = drm_dev_register(drm, 0); 331 if (ret) 332 goto err_unload; 333 334 drm_fbdev_generic_setup(drm, 32); 335 336 return 0; 337 338 err_unload: 339 mxsfb_unload(drm); 340 err_free: 341 drm_dev_put(drm); 342 343 return ret; 344 } 345 346 static int mxsfb_remove(struct platform_device *pdev) 347 { 348 struct drm_device *drm = platform_get_drvdata(pdev); 349 350 drm_dev_unregister(drm); 351 mxsfb_unload(drm); 352 drm_dev_put(drm); 353 354 return 0; 355 } 356 357 #ifdef CONFIG_PM_SLEEP 358 static int mxsfb_suspend(struct device *dev) 359 { 360 struct drm_device *drm = dev_get_drvdata(dev); 361 362 return drm_mode_config_helper_suspend(drm); 363 } 364 365 static int mxsfb_resume(struct device *dev) 366 { 367 struct drm_device *drm = dev_get_drvdata(dev); 368 369 return drm_mode_config_helper_resume(drm); 370 } 371 #endif 372 373 static const struct dev_pm_ops mxsfb_pm_ops = { 374 SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume) 375 }; 376 377 static struct platform_driver mxsfb_platform_driver = { 378 .probe = mxsfb_probe, 379 .remove = mxsfb_remove, 380 .driver = { 381 .name = "mxsfb", 382 .of_match_table = mxsfb_dt_ids, 383 .pm = &mxsfb_pm_ops, 384 }, 385 }; 386 387 module_platform_driver(mxsfb_platform_driver); 388 389 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 390 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver"); 391 MODULE_LICENSE("GPL"); 392