1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2022 Marek Vasut <marex@denx.de> 4 * 5 * This code is based on drivers/gpu/drm/mxsfb/mxsfb* 6 */ 7 8 #include <linux/clk.h> 9 #include <linux/dma-mapping.h> 10 #include <linux/io.h> 11 #include <linux/module.h> 12 #include <linux/of_device.h> 13 #include <linux/platform_device.h> 14 #include <linux/pm_runtime.h> 15 16 #include <drm/drm_atomic_helper.h> 17 #include <drm/drm_bridge.h> 18 #include <drm/drm_drv.h> 19 #include <drm/drm_fbdev_dma.h> 20 #include <drm/drm_gem_dma_helper.h> 21 #include <drm/drm_gem_framebuffer_helper.h> 22 #include <drm/drm_mode_config.h> 23 #include <drm/drm_module.h> 24 #include <drm/drm_of.h> 25 #include <drm/drm_probe_helper.h> 26 #include <drm/drm_vblank.h> 27 28 #include "lcdif_drv.h" 29 #include "lcdif_regs.h" 30 31 static const struct drm_mode_config_funcs lcdif_mode_config_funcs = { 32 .fb_create = drm_gem_fb_create, 33 .atomic_check = drm_atomic_helper_check, 34 .atomic_commit = drm_atomic_helper_commit, 35 }; 36 37 static const struct drm_mode_config_helper_funcs lcdif_mode_config_helpers = { 38 .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm, 39 }; 40 41 static int lcdif_attach_bridge(struct lcdif_drm_private *lcdif) 42 { 43 struct drm_device *drm = lcdif->drm; 44 struct drm_bridge *bridge; 45 int ret; 46 47 bridge = devm_drm_of_get_bridge(drm->dev, drm->dev->of_node, 0, 0); 48 if (IS_ERR(bridge)) 49 return PTR_ERR(bridge); 50 51 ret = drm_bridge_attach(&lcdif->encoder, bridge, NULL, 0); 52 if (ret) 53 return dev_err_probe(drm->dev, ret, "Failed to attach bridge\n"); 54 55 return 0; 56 } 57 58 static irqreturn_t lcdif_irq_handler(int irq, void *data) 59 { 60 struct drm_device *drm = data; 61 struct lcdif_drm_private *lcdif = drm->dev_private; 62 u32 reg, stat; 63 64 stat = readl(lcdif->base + LCDC_V8_INT_STATUS_D0); 65 if (!stat) 66 return IRQ_NONE; 67 68 if (stat & INT_STATUS_D0_VS_BLANK) { 69 reg = readl(lcdif->base + LCDC_V8_CTRLDESCL0_5); 70 if (!(reg & CTRLDESCL0_5_SHADOW_LOAD_EN)) 71 drm_crtc_handle_vblank(&lcdif->crtc); 72 } 73 74 writel(stat, lcdif->base + LCDC_V8_INT_STATUS_D0); 75 76 return IRQ_HANDLED; 77 } 78 79 static int lcdif_load(struct drm_device *drm) 80 { 81 struct platform_device *pdev = to_platform_device(drm->dev); 82 struct lcdif_drm_private *lcdif; 83 struct resource *res; 84 int ret; 85 86 lcdif = devm_kzalloc(&pdev->dev, sizeof(*lcdif), GFP_KERNEL); 87 if (!lcdif) 88 return -ENOMEM; 89 90 lcdif->drm = drm; 91 drm->dev_private = lcdif; 92 93 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 94 lcdif->base = devm_ioremap_resource(drm->dev, res); 95 if (IS_ERR(lcdif->base)) 96 return PTR_ERR(lcdif->base); 97 98 lcdif->clk = devm_clk_get(drm->dev, "pix"); 99 if (IS_ERR(lcdif->clk)) 100 return PTR_ERR(lcdif->clk); 101 102 lcdif->clk_axi = devm_clk_get(drm->dev, "axi"); 103 if (IS_ERR(lcdif->clk_axi)) 104 return PTR_ERR(lcdif->clk_axi); 105 106 lcdif->clk_disp_axi = devm_clk_get(drm->dev, "disp_axi"); 107 if (IS_ERR(lcdif->clk_disp_axi)) 108 return PTR_ERR(lcdif->clk_disp_axi); 109 110 platform_set_drvdata(pdev, drm); 111 112 ret = dma_set_mask_and_coherent(drm->dev, DMA_BIT_MASK(36)); 113 if (ret) 114 return ret; 115 116 /* Modeset init */ 117 drm_mode_config_init(drm); 118 119 ret = lcdif_kms_init(lcdif); 120 if (ret < 0) { 121 dev_err(drm->dev, "Failed to initialize KMS pipeline\n"); 122 return ret; 123 } 124 125 ret = drm_vblank_init(drm, drm->mode_config.num_crtc); 126 if (ret < 0) { 127 dev_err(drm->dev, "Failed to initialise vblank\n"); 128 return ret; 129 } 130 131 /* Start with vertical blanking interrupt reporting disabled. */ 132 drm_crtc_vblank_off(&lcdif->crtc); 133 134 ret = lcdif_attach_bridge(lcdif); 135 if (ret) 136 return dev_err_probe(drm->dev, ret, "Cannot connect bridge\n"); 137 138 drm->mode_config.min_width = LCDIF_MIN_XRES; 139 drm->mode_config.min_height = LCDIF_MIN_YRES; 140 drm->mode_config.max_width = LCDIF_MAX_XRES; 141 drm->mode_config.max_height = LCDIF_MAX_YRES; 142 drm->mode_config.funcs = &lcdif_mode_config_funcs; 143 drm->mode_config.helper_private = &lcdif_mode_config_helpers; 144 145 drm_mode_config_reset(drm); 146 147 ret = platform_get_irq(pdev, 0); 148 if (ret < 0) 149 return ret; 150 lcdif->irq = ret; 151 152 ret = devm_request_irq(drm->dev, lcdif->irq, lcdif_irq_handler, 0, 153 drm->driver->name, drm); 154 if (ret < 0) { 155 dev_err(drm->dev, "Failed to install IRQ handler\n"); 156 return ret; 157 } 158 159 drm_kms_helper_poll_init(drm); 160 161 drm_helper_hpd_irq_event(drm); 162 163 pm_runtime_enable(drm->dev); 164 165 return 0; 166 } 167 168 static void lcdif_unload(struct drm_device *drm) 169 { 170 struct lcdif_drm_private *lcdif = drm->dev_private; 171 172 pm_runtime_get_sync(drm->dev); 173 174 drm_crtc_vblank_off(&lcdif->crtc); 175 176 drm_kms_helper_poll_fini(drm); 177 drm_mode_config_cleanup(drm); 178 179 pm_runtime_put_sync(drm->dev); 180 pm_runtime_disable(drm->dev); 181 182 drm->dev_private = NULL; 183 } 184 185 DEFINE_DRM_GEM_DMA_FOPS(fops); 186 187 static const struct drm_driver lcdif_driver = { 188 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, 189 DRM_GEM_DMA_DRIVER_OPS, 190 .fops = &fops, 191 .name = "imx-lcdif", 192 .desc = "i.MX LCDIF Controller DRM", 193 .date = "20220417", 194 .major = 1, 195 .minor = 0, 196 }; 197 198 static const struct of_device_id lcdif_dt_ids[] = { 199 { .compatible = "fsl,imx8mp-lcdif" }, 200 { /* sentinel */ } 201 }; 202 MODULE_DEVICE_TABLE(of, lcdif_dt_ids); 203 204 static int lcdif_probe(struct platform_device *pdev) 205 { 206 struct drm_device *drm; 207 int ret; 208 209 drm = drm_dev_alloc(&lcdif_driver, &pdev->dev); 210 if (IS_ERR(drm)) 211 return PTR_ERR(drm); 212 213 ret = lcdif_load(drm); 214 if (ret) 215 goto err_free; 216 217 ret = drm_dev_register(drm, 0); 218 if (ret) 219 goto err_unload; 220 221 drm_fbdev_dma_setup(drm, 32); 222 223 return 0; 224 225 err_unload: 226 lcdif_unload(drm); 227 err_free: 228 drm_dev_put(drm); 229 230 return ret; 231 } 232 233 static int lcdif_remove(struct platform_device *pdev) 234 { 235 struct drm_device *drm = platform_get_drvdata(pdev); 236 237 drm_dev_unregister(drm); 238 drm_atomic_helper_shutdown(drm); 239 lcdif_unload(drm); 240 drm_dev_put(drm); 241 242 return 0; 243 } 244 245 static void lcdif_shutdown(struct platform_device *pdev) 246 { 247 struct drm_device *drm = platform_get_drvdata(pdev); 248 249 drm_atomic_helper_shutdown(drm); 250 } 251 252 static int __maybe_unused lcdif_rpm_suspend(struct device *dev) 253 { 254 struct drm_device *drm = dev_get_drvdata(dev); 255 struct lcdif_drm_private *lcdif = drm->dev_private; 256 257 /* These clock supply the DISPLAY CLOCK Domain */ 258 clk_disable_unprepare(lcdif->clk); 259 /* These clock supply the System Bus, AXI, Write Path, LFIFO */ 260 clk_disable_unprepare(lcdif->clk_disp_axi); 261 /* These clock supply the Control Bus, APB, APBH Ctrl Registers */ 262 clk_disable_unprepare(lcdif->clk_axi); 263 264 return 0; 265 } 266 267 static int __maybe_unused lcdif_rpm_resume(struct device *dev) 268 { 269 struct drm_device *drm = dev_get_drvdata(dev); 270 struct lcdif_drm_private *lcdif = drm->dev_private; 271 272 /* These clock supply the Control Bus, APB, APBH Ctrl Registers */ 273 clk_prepare_enable(lcdif->clk_axi); 274 /* These clock supply the System Bus, AXI, Write Path, LFIFO */ 275 clk_prepare_enable(lcdif->clk_disp_axi); 276 /* These clock supply the DISPLAY CLOCK Domain */ 277 clk_prepare_enable(lcdif->clk); 278 279 return 0; 280 } 281 282 static int __maybe_unused lcdif_suspend(struct device *dev) 283 { 284 struct drm_device *drm = dev_get_drvdata(dev); 285 int ret; 286 287 ret = drm_mode_config_helper_suspend(drm); 288 if (ret) 289 return ret; 290 291 return lcdif_rpm_suspend(dev); 292 } 293 294 static int __maybe_unused lcdif_resume(struct device *dev) 295 { 296 struct drm_device *drm = dev_get_drvdata(dev); 297 298 lcdif_rpm_resume(dev); 299 300 return drm_mode_config_helper_resume(drm); 301 } 302 303 static const struct dev_pm_ops lcdif_pm_ops = { 304 SET_SYSTEM_SLEEP_PM_OPS(lcdif_suspend, lcdif_resume) 305 SET_RUNTIME_PM_OPS(lcdif_rpm_suspend, lcdif_rpm_resume, NULL) 306 }; 307 308 static struct platform_driver lcdif_platform_driver = { 309 .probe = lcdif_probe, 310 .remove = lcdif_remove, 311 .shutdown = lcdif_shutdown, 312 .driver = { 313 .name = "imx-lcdif", 314 .of_match_table = lcdif_dt_ids, 315 .pm = &lcdif_pm_ops, 316 }, 317 }; 318 319 drm_module_platform_driver(lcdif_platform_driver); 320 321 MODULE_AUTHOR("Marek Vasut <marex@denx.de>"); 322 MODULE_DESCRIPTION("Freescale LCDIF DRM/KMS driver"); 323 MODULE_LICENSE("GPL"); 324