1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ZynqMP DisplayPort Subsystem Driver 4 * 5 * Copyright (C) 2017 - 2020 Xilinx, Inc. 6 * 7 * Authors: 8 * - Hyun Woo Kwon <hyun.kwon@xilinx.com> 9 * - Laurent Pinchart <laurent.pinchart@ideasonboard.com> 10 */ 11 12 #include <linux/clk.h> 13 #include <linux/dma-mapping.h> 14 #include <linux/module.h> 15 #include <linux/of_reserved_mem.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_device.h> 21 #include <drm/drm_drv.h> 22 #include <drm/drm_fb_helper.h> 23 #include <drm/drm_fourcc.h> 24 #include <drm/drm_gem_cma_helper.h> 25 #include <drm/drm_gem_framebuffer_helper.h> 26 #include <drm/drm_managed.h> 27 #include <drm/drm_mode_config.h> 28 #include <drm/drm_probe_helper.h> 29 #include <drm/drm_vblank.h> 30 31 #include "zynqmp_disp.h" 32 #include "zynqmp_dp.h" 33 #include "zynqmp_dpsub.h" 34 35 /* ----------------------------------------------------------------------------- 36 * Dumb Buffer & Framebuffer Allocation 37 */ 38 39 static int zynqmp_dpsub_dumb_create(struct drm_file *file_priv, 40 struct drm_device *drm, 41 struct drm_mode_create_dumb *args) 42 { 43 struct zynqmp_dpsub *dpsub = to_zynqmp_dpsub(drm); 44 unsigned int pitch = DIV_ROUND_UP(args->width * args->bpp, 8); 45 46 /* Enforce the alignment constraints of the DMA engine. */ 47 args->pitch = ALIGN(pitch, dpsub->dma_align); 48 49 return drm_gem_cma_dumb_create_internal(file_priv, drm, args); 50 } 51 52 static struct drm_framebuffer * 53 zynqmp_dpsub_fb_create(struct drm_device *drm, struct drm_file *file_priv, 54 const struct drm_mode_fb_cmd2 *mode_cmd) 55 { 56 struct zynqmp_dpsub *dpsub = to_zynqmp_dpsub(drm); 57 struct drm_mode_fb_cmd2 cmd = *mode_cmd; 58 unsigned int i; 59 60 /* Enforce the alignment constraints of the DMA engine. */ 61 for (i = 0; i < ARRAY_SIZE(cmd.pitches); ++i) 62 cmd.pitches[i] = ALIGN(cmd.pitches[i], dpsub->dma_align); 63 64 return drm_gem_fb_create(drm, file_priv, &cmd); 65 } 66 67 static const struct drm_mode_config_funcs zynqmp_dpsub_mode_config_funcs = { 68 .fb_create = zynqmp_dpsub_fb_create, 69 .atomic_check = drm_atomic_helper_check, 70 .atomic_commit = drm_atomic_helper_commit, 71 }; 72 73 /* ----------------------------------------------------------------------------- 74 * DRM/KMS Driver 75 */ 76 77 DEFINE_DRM_GEM_CMA_FOPS(zynqmp_dpsub_drm_fops); 78 79 static const struct drm_driver zynqmp_dpsub_drm_driver = { 80 .driver_features = DRIVER_MODESET | DRIVER_GEM | 81 DRIVER_ATOMIC, 82 83 DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(zynqmp_dpsub_dumb_create), 84 85 .fops = &zynqmp_dpsub_drm_fops, 86 87 .name = "zynqmp-dpsub", 88 .desc = "Xilinx DisplayPort Subsystem Driver", 89 .date = "20130509", 90 .major = 1, 91 .minor = 0, 92 }; 93 94 static int zynqmp_dpsub_drm_init(struct zynqmp_dpsub *dpsub) 95 { 96 struct drm_device *drm = &dpsub->drm; 97 int ret; 98 99 /* Initialize mode config, vblank and the KMS poll helper. */ 100 ret = drmm_mode_config_init(drm); 101 if (ret < 0) 102 return ret; 103 104 drm->mode_config.funcs = &zynqmp_dpsub_mode_config_funcs; 105 drm->mode_config.min_width = 0; 106 drm->mode_config.min_height = 0; 107 drm->mode_config.max_width = ZYNQMP_DISP_MAX_WIDTH; 108 drm->mode_config.max_height = ZYNQMP_DISP_MAX_HEIGHT; 109 110 ret = drm_vblank_init(drm, 1); 111 if (ret) 112 return ret; 113 114 drm->irq_enabled = 1; 115 116 drm_kms_helper_poll_init(drm); 117 118 /* 119 * Initialize the DISP and DP components. This will creates planes, 120 * CRTC, encoder and connector. The DISP should be initialized first as 121 * the DP encoder needs the CRTC. 122 */ 123 ret = zynqmp_disp_drm_init(dpsub); 124 if (ret) 125 goto err_poll_fini; 126 127 ret = zynqmp_dp_drm_init(dpsub); 128 if (ret) 129 goto err_poll_fini; 130 131 /* Reset all components and register the DRM device. */ 132 drm_mode_config_reset(drm); 133 134 ret = drm_dev_register(drm, 0); 135 if (ret < 0) 136 goto err_poll_fini; 137 138 /* Initialize fbdev generic emulation. */ 139 drm_fbdev_generic_setup(drm, 24); 140 141 return 0; 142 143 err_poll_fini: 144 drm_kms_helper_poll_fini(drm); 145 return ret; 146 } 147 148 /* ----------------------------------------------------------------------------- 149 * Power Management 150 */ 151 152 static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev) 153 { 154 struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev); 155 156 return drm_mode_config_helper_suspend(&dpsub->drm); 157 } 158 159 static int __maybe_unused zynqmp_dpsub_resume(struct device *dev) 160 { 161 struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev); 162 163 return drm_mode_config_helper_resume(&dpsub->drm); 164 } 165 166 static const struct dev_pm_ops zynqmp_dpsub_pm_ops = { 167 SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume) 168 }; 169 170 /* ----------------------------------------------------------------------------- 171 * Probe & Remove 172 */ 173 174 static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub) 175 { 176 int ret; 177 178 dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk"); 179 if (IS_ERR(dpsub->apb_clk)) 180 return PTR_ERR(dpsub->apb_clk); 181 182 ret = clk_prepare_enable(dpsub->apb_clk); 183 if (ret) { 184 dev_err(dpsub->dev, "failed to enable the APB clock\n"); 185 return ret; 186 } 187 188 return 0; 189 } 190 191 static int zynqmp_dpsub_probe(struct platform_device *pdev) 192 { 193 struct zynqmp_dpsub *dpsub; 194 int ret; 195 196 /* Allocate private data. */ 197 dpsub = devm_drm_dev_alloc(&pdev->dev, &zynqmp_dpsub_drm_driver, 198 struct zynqmp_dpsub, drm); 199 if (IS_ERR(dpsub)) 200 return PTR_ERR(dpsub); 201 202 dpsub->dev = &pdev->dev; 203 platform_set_drvdata(pdev, dpsub); 204 205 dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT)); 206 207 /* Try the reserved memory. Proceed if there's none. */ 208 of_reserved_mem_device_init(&pdev->dev); 209 210 ret = zynqmp_dpsub_init_clocks(dpsub); 211 if (ret < 0) 212 goto err_mem; 213 214 pm_runtime_enable(&pdev->dev); 215 216 /* 217 * DP should be probed first so that the zynqmp_disp can set the output 218 * format accordingly. 219 */ 220 ret = zynqmp_dp_probe(dpsub, &dpsub->drm); 221 if (ret) 222 goto err_pm; 223 224 ret = zynqmp_disp_probe(dpsub, &dpsub->drm); 225 if (ret) 226 goto err_dp; 227 228 ret = zynqmp_dpsub_drm_init(dpsub); 229 if (ret) 230 goto err_disp; 231 232 dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed"); 233 234 return 0; 235 236 err_disp: 237 zynqmp_disp_remove(dpsub); 238 err_dp: 239 zynqmp_dp_remove(dpsub); 240 err_pm: 241 pm_runtime_disable(&pdev->dev); 242 clk_disable_unprepare(dpsub->apb_clk); 243 err_mem: 244 of_reserved_mem_device_release(&pdev->dev); 245 return ret; 246 } 247 248 static int zynqmp_dpsub_remove(struct platform_device *pdev) 249 { 250 struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); 251 struct drm_device *drm = &dpsub->drm; 252 253 drm_dev_unregister(drm); 254 drm_atomic_helper_shutdown(drm); 255 drm_kms_helper_poll_fini(drm); 256 257 zynqmp_disp_remove(dpsub); 258 zynqmp_dp_remove(dpsub); 259 260 pm_runtime_disable(&pdev->dev); 261 clk_disable_unprepare(dpsub->apb_clk); 262 of_reserved_mem_device_release(&pdev->dev); 263 264 return 0; 265 } 266 267 static void zynqmp_dpsub_shutdown(struct platform_device *pdev) 268 { 269 struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); 270 271 drm_atomic_helper_shutdown(&dpsub->drm); 272 } 273 274 static const struct of_device_id zynqmp_dpsub_of_match[] = { 275 { .compatible = "xlnx,zynqmp-dpsub-1.7", }, 276 { /* end of table */ }, 277 }; 278 MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match); 279 280 static struct platform_driver zynqmp_dpsub_driver = { 281 .probe = zynqmp_dpsub_probe, 282 .remove = zynqmp_dpsub_remove, 283 .shutdown = zynqmp_dpsub_shutdown, 284 .driver = { 285 .name = "zynqmp-dpsub", 286 .pm = &zynqmp_dpsub_pm_ops, 287 .of_match_table = zynqmp_dpsub_of_match, 288 }, 289 }; 290 291 module_platform_driver(zynqmp_dpsub_driver); 292 293 MODULE_AUTHOR("Xilinx, Inc."); 294 MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver"); 295 MODULE_LICENSE("GPL v2"); 296