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_kms_helper_poll_init(drm); 115 116 /* 117 * Initialize the DISP and DP components. This will creates planes, 118 * CRTC, encoder and connector. The DISP should be initialized first as 119 * the DP encoder needs the CRTC. 120 */ 121 ret = zynqmp_disp_drm_init(dpsub); 122 if (ret) 123 goto err_poll_fini; 124 125 ret = zynqmp_dp_drm_init(dpsub); 126 if (ret) 127 goto err_poll_fini; 128 129 /* Reset all components and register the DRM device. */ 130 drm_mode_config_reset(drm); 131 132 ret = drm_dev_register(drm, 0); 133 if (ret < 0) 134 goto err_poll_fini; 135 136 /* Initialize fbdev generic emulation. */ 137 drm_fbdev_generic_setup(drm, 24); 138 139 return 0; 140 141 err_poll_fini: 142 drm_kms_helper_poll_fini(drm); 143 return ret; 144 } 145 146 /* ----------------------------------------------------------------------------- 147 * Power Management 148 */ 149 150 static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev) 151 { 152 struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev); 153 154 return drm_mode_config_helper_suspend(&dpsub->drm); 155 } 156 157 static int __maybe_unused zynqmp_dpsub_resume(struct device *dev) 158 { 159 struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev); 160 161 return drm_mode_config_helper_resume(&dpsub->drm); 162 } 163 164 static const struct dev_pm_ops zynqmp_dpsub_pm_ops = { 165 SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume) 166 }; 167 168 /* ----------------------------------------------------------------------------- 169 * Probe & Remove 170 */ 171 172 static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub) 173 { 174 int ret; 175 176 dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk"); 177 if (IS_ERR(dpsub->apb_clk)) 178 return PTR_ERR(dpsub->apb_clk); 179 180 ret = clk_prepare_enable(dpsub->apb_clk); 181 if (ret) { 182 dev_err(dpsub->dev, "failed to enable the APB clock\n"); 183 return ret; 184 } 185 186 return 0; 187 } 188 189 static int zynqmp_dpsub_probe(struct platform_device *pdev) 190 { 191 struct zynqmp_dpsub *dpsub; 192 int ret; 193 194 /* Allocate private data. */ 195 dpsub = devm_drm_dev_alloc(&pdev->dev, &zynqmp_dpsub_drm_driver, 196 struct zynqmp_dpsub, drm); 197 if (IS_ERR(dpsub)) 198 return PTR_ERR(dpsub); 199 200 dpsub->dev = &pdev->dev; 201 platform_set_drvdata(pdev, dpsub); 202 203 dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT)); 204 205 /* Try the reserved memory. Proceed if there's none. */ 206 of_reserved_mem_device_init(&pdev->dev); 207 208 ret = zynqmp_dpsub_init_clocks(dpsub); 209 if (ret < 0) 210 goto err_mem; 211 212 pm_runtime_enable(&pdev->dev); 213 214 /* 215 * DP should be probed first so that the zynqmp_disp can set the output 216 * format accordingly. 217 */ 218 ret = zynqmp_dp_probe(dpsub, &dpsub->drm); 219 if (ret) 220 goto err_pm; 221 222 ret = zynqmp_disp_probe(dpsub, &dpsub->drm); 223 if (ret) 224 goto err_dp; 225 226 ret = zynqmp_dpsub_drm_init(dpsub); 227 if (ret) 228 goto err_disp; 229 230 dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed"); 231 232 return 0; 233 234 err_disp: 235 zynqmp_disp_remove(dpsub); 236 err_dp: 237 zynqmp_dp_remove(dpsub); 238 err_pm: 239 pm_runtime_disable(&pdev->dev); 240 clk_disable_unprepare(dpsub->apb_clk); 241 err_mem: 242 of_reserved_mem_device_release(&pdev->dev); 243 return ret; 244 } 245 246 static int zynqmp_dpsub_remove(struct platform_device *pdev) 247 { 248 struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); 249 struct drm_device *drm = &dpsub->drm; 250 251 drm_dev_unregister(drm); 252 drm_atomic_helper_shutdown(drm); 253 drm_kms_helper_poll_fini(drm); 254 255 zynqmp_disp_remove(dpsub); 256 zynqmp_dp_remove(dpsub); 257 258 pm_runtime_disable(&pdev->dev); 259 clk_disable_unprepare(dpsub->apb_clk); 260 of_reserved_mem_device_release(&pdev->dev); 261 262 return 0; 263 } 264 265 static void zynqmp_dpsub_shutdown(struct platform_device *pdev) 266 { 267 struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); 268 269 drm_atomic_helper_shutdown(&dpsub->drm); 270 } 271 272 static const struct of_device_id zynqmp_dpsub_of_match[] = { 273 { .compatible = "xlnx,zynqmp-dpsub-1.7", }, 274 { /* end of table */ }, 275 }; 276 MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match); 277 278 static struct platform_driver zynqmp_dpsub_driver = { 279 .probe = zynqmp_dpsub_probe, 280 .remove = zynqmp_dpsub_remove, 281 .shutdown = zynqmp_dpsub_shutdown, 282 .driver = { 283 .name = "zynqmp-dpsub", 284 .pm = &zynqmp_dpsub_pm_ops, 285 .of_match_table = zynqmp_dpsub_of_match, 286 }, 287 }; 288 289 module_platform_driver(zynqmp_dpsub_driver); 290 291 MODULE_AUTHOR("Xilinx, Inc."); 292 MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver"); 293 MODULE_LICENSE("GPL v2"); 294