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_gem_cma_helper.h> 25 #include <drm/drm_gem_framebuffer_helper.h> 26 #include <drm/drm_irq.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 }, 54 [MXSFB_V4] = { 55 .transfer_count = LCDC_V4_TRANSFER_COUNT, 56 .cur_buf = LCDC_V4_CUR_BUF, 57 .next_buf = LCDC_V4_NEXT_BUF, 58 .hs_wdth_mask = 0x3fff, 59 .hs_wdth_shift = 18, 60 .has_overlay = false, 61 }, 62 [MXSFB_V6] = { 63 .transfer_count = LCDC_V4_TRANSFER_COUNT, 64 .cur_buf = LCDC_V4_CUR_BUF, 65 .next_buf = LCDC_V4_NEXT_BUF, 66 .hs_wdth_mask = 0x3fff, 67 .hs_wdth_shift = 18, 68 .has_overlay = true, 69 }, 70 }; 71 72 void mxsfb_enable_axi_clk(struct mxsfb_drm_private *mxsfb) 73 { 74 if (mxsfb->clk_axi) 75 clk_prepare_enable(mxsfb->clk_axi); 76 } 77 78 void mxsfb_disable_axi_clk(struct mxsfb_drm_private *mxsfb) 79 { 80 if (mxsfb->clk_axi) 81 clk_disable_unprepare(mxsfb->clk_axi); 82 } 83 84 static const struct drm_mode_config_funcs mxsfb_mode_config_funcs = { 85 .fb_create = drm_gem_fb_create, 86 .atomic_check = drm_atomic_helper_check, 87 .atomic_commit = drm_atomic_helper_commit, 88 }; 89 90 static const struct drm_mode_config_helper_funcs mxsfb_mode_config_helpers = { 91 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 92 }; 93 94 static int mxsfb_attach_bridge(struct mxsfb_drm_private *mxsfb) 95 { 96 struct drm_device *drm = mxsfb->drm; 97 struct drm_connector_list_iter iter; 98 struct drm_panel *panel; 99 struct drm_bridge *bridge; 100 int ret; 101 102 ret = drm_of_find_panel_or_bridge(drm->dev->of_node, 0, 0, &panel, 103 &bridge); 104 if (ret) 105 return ret; 106 107 if (panel) { 108 bridge = devm_drm_panel_bridge_add_typed(drm->dev, panel, 109 DRM_MODE_CONNECTOR_DPI); 110 if (IS_ERR(bridge)) 111 return PTR_ERR(bridge); 112 } 113 114 if (!bridge) 115 return -ENODEV; 116 117 ret = drm_bridge_attach(&mxsfb->encoder, bridge, NULL, 0); 118 if (ret) { 119 DRM_DEV_ERROR(drm->dev, 120 "failed to attach bridge: %d\n", ret); 121 return ret; 122 } 123 124 mxsfb->bridge = bridge; 125 126 /* 127 * Get hold of the connector. This is a bit of a hack, until the bridge 128 * API gives us bus flags and formats. 129 */ 130 drm_connector_list_iter_begin(drm, &iter); 131 mxsfb->connector = drm_connector_list_iter_next(&iter); 132 drm_connector_list_iter_end(&iter); 133 134 return 0; 135 } 136 137 static int mxsfb_load(struct drm_device *drm, 138 const struct mxsfb_devdata *devdata) 139 { 140 struct platform_device *pdev = to_platform_device(drm->dev); 141 struct mxsfb_drm_private *mxsfb; 142 struct resource *res; 143 int ret; 144 145 mxsfb = devm_kzalloc(&pdev->dev, sizeof(*mxsfb), GFP_KERNEL); 146 if (!mxsfb) 147 return -ENOMEM; 148 149 mxsfb->drm = drm; 150 drm->dev_private = mxsfb; 151 mxsfb->devdata = devdata; 152 153 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 154 mxsfb->base = devm_ioremap_resource(drm->dev, res); 155 if (IS_ERR(mxsfb->base)) 156 return PTR_ERR(mxsfb->base); 157 158 mxsfb->clk = devm_clk_get(drm->dev, NULL); 159 if (IS_ERR(mxsfb->clk)) 160 return PTR_ERR(mxsfb->clk); 161 162 mxsfb->clk_axi = devm_clk_get(drm->dev, "axi"); 163 if (IS_ERR(mxsfb->clk_axi)) 164 mxsfb->clk_axi = NULL; 165 166 mxsfb->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi"); 167 if (IS_ERR(mxsfb->clk_disp_axi)) 168 mxsfb->clk_disp_axi = NULL; 169 170 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(32)); 171 if (ret) 172 return ret; 173 174 pm_runtime_enable(drm->dev); 175 176 /* Modeset init */ 177 drm_mode_config_init(drm); 178 179 ret = mxsfb_kms_init(mxsfb); 180 if (ret < 0) { 181 dev_err(drm->dev, "Failed to initialize KMS pipeline\n"); 182 goto err_vblank; 183 } 184 185 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 186 if (ret < 0) { 187 dev_err(drm->dev, "Failed to initialise vblank\n"); 188 goto err_vblank; 189 } 190 191 /* Start with vertical blanking interrupt reporting disabled. */ 192 drm_crtc_vblank_off(&mxsfb->crtc); 193 194 ret = mxsfb_attach_bridge(mxsfb); 195 if (ret) { 196 dev_err(drm->dev, "Cannot connect bridge: %d\n", ret); 197 goto err_vblank; 198 } 199 200 drm->mode_config.min_width = MXSFB_MIN_XRES; 201 drm->mode_config.min_height = MXSFB_MIN_YRES; 202 drm->mode_config.max_width = MXSFB_MAX_XRES; 203 drm->mode_config.max_height = MXSFB_MAX_YRES; 204 drm->mode_config.funcs = &mxsfb_mode_config_funcs; 205 drm->mode_config.helper_private = &mxsfb_mode_config_helpers; 206 207 drm_mode_config_reset(drm); 208 209 pm_runtime_get_sync(drm->dev); 210 ret = drm_irq_install(drm, platform_get_irq(pdev, 0)); 211 pm_runtime_put_sync(drm->dev); 212 213 if (ret < 0) { 214 dev_err(drm->dev, "Failed to install IRQ handler\n"); 215 goto err_vblank; 216 } 217 218 drm_kms_helper_poll_init(drm); 219 220 platform_set_drvdata(pdev, drm); 221 222 drm_helper_hpd_irq_event(drm); 223 224 return 0; 225 226 err_vblank: 227 pm_runtime_disable(drm->dev); 228 229 return ret; 230 } 231 232 static void mxsfb_unload(struct drm_device *drm) 233 { 234 drm_kms_helper_poll_fini(drm); 235 drm_mode_config_cleanup(drm); 236 237 pm_runtime_get_sync(drm->dev); 238 drm_irq_uninstall(drm); 239 pm_runtime_put_sync(drm->dev); 240 241 drm->dev_private = NULL; 242 243 pm_runtime_disable(drm->dev); 244 } 245 246 static void mxsfb_irq_disable(struct drm_device *drm) 247 { 248 struct mxsfb_drm_private *mxsfb = drm->dev_private; 249 250 mxsfb_enable_axi_clk(mxsfb); 251 mxsfb->crtc.funcs->disable_vblank(&mxsfb->crtc); 252 mxsfb_disable_axi_clk(mxsfb); 253 } 254 255 static irqreturn_t mxsfb_irq_handler(int irq, void *data) 256 { 257 struct drm_device *drm = data; 258 struct mxsfb_drm_private *mxsfb = drm->dev_private; 259 u32 reg; 260 261 reg = readl(mxsfb->base + LCDC_CTRL1); 262 263 if (reg & CTRL1_CUR_FRAME_DONE_IRQ) 264 drm_crtc_handle_vblank(&mxsfb->crtc); 265 266 writel(CTRL1_CUR_FRAME_DONE_IRQ, mxsfb->base + LCDC_CTRL1 + REG_CLR); 267 268 return IRQ_HANDLED; 269 } 270 271 DEFINE_DRM_GEM_CMA_FOPS(fops); 272 273 static struct drm_driver mxsfb_driver = { 274 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 275 .irq_handler = mxsfb_irq_handler, 276 .irq_preinstall = mxsfb_irq_disable, 277 .irq_uninstall = mxsfb_irq_disable, 278 DRM_GEM_CMA_DRIVER_OPS, 279 .fops = &fops, 280 .name = "mxsfb-drm", 281 .desc = "MXSFB Controller DRM", 282 .date = "20160824", 283 .major = 1, 284 .minor = 0, 285 }; 286 287 static const struct of_device_id mxsfb_dt_ids[] = { 288 { .compatible = "fsl,imx23-lcdif", .data = &mxsfb_devdata[MXSFB_V3], }, 289 { .compatible = "fsl,imx28-lcdif", .data = &mxsfb_devdata[MXSFB_V4], }, 290 { .compatible = "fsl,imx6sx-lcdif", .data = &mxsfb_devdata[MXSFB_V6], }, 291 { /* sentinel */ } 292 }; 293 MODULE_DEVICE_TABLE(of, mxsfb_dt_ids); 294 295 static int mxsfb_probe(struct platform_device *pdev) 296 { 297 struct drm_device *drm; 298 const struct of_device_id *of_id = 299 of_match_device(mxsfb_dt_ids, &pdev->dev); 300 int ret; 301 302 if (!pdev->dev.of_node) 303 return -ENODEV; 304 305 drm = drm_dev_alloc(&mxsfb_driver, &pdev->dev); 306 if (IS_ERR(drm)) 307 return PTR_ERR(drm); 308 309 ret = mxsfb_load(drm, of_id->data); 310 if (ret) 311 goto err_free; 312 313 ret = drm_dev_register(drm, 0); 314 if (ret) 315 goto err_unload; 316 317 drm_fbdev_generic_setup(drm, 32); 318 319 return 0; 320 321 err_unload: 322 mxsfb_unload(drm); 323 err_free: 324 drm_dev_put(drm); 325 326 return ret; 327 } 328 329 static int mxsfb_remove(struct platform_device *pdev) 330 { 331 struct drm_device *drm = platform_get_drvdata(pdev); 332 333 drm_dev_unregister(drm); 334 mxsfb_unload(drm); 335 drm_dev_put(drm); 336 337 return 0; 338 } 339 340 #ifdef CONFIG_PM_SLEEP 341 static int mxsfb_suspend(struct device *dev) 342 { 343 struct drm_device *drm = dev_get_drvdata(dev); 344 345 return drm_mode_config_helper_suspend(drm); 346 } 347 348 static int mxsfb_resume(struct device *dev) 349 { 350 struct drm_device *drm = dev_get_drvdata(dev); 351 352 return drm_mode_config_helper_resume(drm); 353 } 354 #endif 355 356 static const struct dev_pm_ops mxsfb_pm_ops = { 357 SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume) 358 }; 359 360 static struct platform_driver mxsfb_platform_driver = { 361 .probe = mxsfb_probe, 362 .remove = mxsfb_remove, 363 .driver = { 364 .name = "mxsfb", 365 .of_match_table = mxsfb_dt_ids, 366 .pm = &mxsfb_pm_ops, 367 }, 368 }; 369 370 module_platform_driver(mxsfb_platform_driver); 371 372 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 373 MODULE_DESCRIPTION("Freescale MXS DRM/KMS driver"); 374 MODULE_LICENSE("GPL"); 375