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 struct drm_driver zynqmp_dpsub_drm_driver = { 80 .driver_features = DRIVER_MODESET | DRIVER_GEM | 81 DRIVER_ATOMIC, 82 83 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, 84 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, 85 .gem_prime_export = drm_gem_prime_export, 86 .gem_prime_import = drm_gem_prime_import, 87 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table, 88 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table, 89 .gem_prime_vmap = drm_gem_cma_prime_vmap, 90 .gem_prime_vunmap = drm_gem_cma_prime_vunmap, 91 .gem_prime_mmap = drm_gem_cma_prime_mmap, 92 .gem_free_object_unlocked = drm_gem_cma_free_object, 93 .gem_vm_ops = &drm_gem_cma_vm_ops, 94 .dumb_create = zynqmp_dpsub_dumb_create, 95 .dumb_destroy = drm_gem_dumb_destroy, 96 97 .fops = &zynqmp_dpsub_drm_fops, 98 99 .name = "zynqmp-dpsub", 100 .desc = "Xilinx DisplayPort Subsystem Driver", 101 .date = "20130509", 102 .major = 1, 103 .minor = 0, 104 }; 105 106 static int zynqmp_dpsub_drm_init(struct zynqmp_dpsub *dpsub) 107 { 108 struct drm_device *drm = &dpsub->drm; 109 int ret; 110 111 /* Initialize mode config, vblank and the KMS poll helper. */ 112 ret = drmm_mode_config_init(drm); 113 if (ret < 0) 114 goto err_dev_put; 115 116 drm->mode_config.funcs = &zynqmp_dpsub_mode_config_funcs; 117 drm->mode_config.min_width = 0; 118 drm->mode_config.min_height = 0; 119 drm->mode_config.max_width = ZYNQMP_DISP_MAX_WIDTH; 120 drm->mode_config.max_height = ZYNQMP_DISP_MAX_HEIGHT; 121 122 ret = drm_vblank_init(drm, 1); 123 if (ret) 124 goto err_dev_put; 125 126 drm->irq_enabled = 1; 127 128 drm_kms_helper_poll_init(drm); 129 130 /* 131 * Initialize the DISP and DP components. This will creates planes, 132 * CRTC, encoder and connector. The DISP should be initialized first as 133 * the DP encoder needs the CRTC. 134 */ 135 ret = zynqmp_disp_drm_init(dpsub); 136 if (ret) 137 goto err_poll_fini; 138 139 ret = zynqmp_dp_drm_init(dpsub); 140 if (ret) 141 goto err_poll_fini; 142 143 /* Reset all components and register the DRM device. */ 144 drm_mode_config_reset(drm); 145 146 ret = drm_dev_register(drm, 0); 147 if (ret < 0) 148 goto err_poll_fini; 149 150 /* Initialize fbdev generic emulation. */ 151 drm_fbdev_generic_setup(drm, 24); 152 153 return 0; 154 155 err_poll_fini: 156 drm_kms_helper_poll_fini(drm); 157 err_dev_put: 158 drm_dev_put(drm); 159 return ret; 160 } 161 162 /* ----------------------------------------------------------------------------- 163 * Power Management 164 */ 165 166 static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev) 167 { 168 struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev); 169 170 return drm_mode_config_helper_suspend(&dpsub->drm); 171 } 172 173 static int __maybe_unused zynqmp_dpsub_resume(struct device *dev) 174 { 175 struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev); 176 177 return drm_mode_config_helper_resume(&dpsub->drm); 178 } 179 180 static const struct dev_pm_ops zynqmp_dpsub_pm_ops = { 181 SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume) 182 }; 183 184 /* ----------------------------------------------------------------------------- 185 * Probe & Remove 186 */ 187 188 static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub) 189 { 190 int ret; 191 192 dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk"); 193 if (IS_ERR(dpsub->apb_clk)) 194 return PTR_ERR(dpsub->apb_clk); 195 196 ret = clk_prepare_enable(dpsub->apb_clk); 197 if (ret) { 198 dev_err(dpsub->dev, "failed to enable the APB clock\n"); 199 return ret; 200 } 201 202 return 0; 203 } 204 205 static int zynqmp_dpsub_probe(struct platform_device *pdev) 206 { 207 struct zynqmp_dpsub *dpsub; 208 int ret; 209 210 /* Allocate private data. */ 211 dpsub = kzalloc(sizeof(*dpsub), GFP_KERNEL); 212 if (!dpsub) 213 return -ENOMEM; 214 215 dpsub->dev = &pdev->dev; 216 platform_set_drvdata(pdev, dpsub); 217 218 dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT)); 219 220 /* 221 * Initialize the DRM device early, as the DRM core mandates usage of 222 * the managed memory helpers tied to the DRM device. 223 */ 224 ret = drm_dev_init(&dpsub->drm, &zynqmp_dpsub_drm_driver, &pdev->dev); 225 if (ret < 0) { 226 kfree(dpsub); 227 return ret; 228 } 229 230 drmm_add_final_kfree(&dpsub->drm, dpsub); 231 232 /* Try the reserved memory. Proceed if there's none. */ 233 of_reserved_mem_device_init(&pdev->dev); 234 235 ret = zynqmp_dpsub_init_clocks(dpsub); 236 if (ret < 0) 237 goto err_mem; 238 239 pm_runtime_enable(&pdev->dev); 240 241 /* 242 * DP should be probed first so that the zynqmp_disp can set the output 243 * format accordingly. 244 */ 245 ret = zynqmp_dp_probe(dpsub, &dpsub->drm); 246 if (ret) 247 goto err_pm; 248 249 ret = zynqmp_disp_probe(dpsub, &dpsub->drm); 250 if (ret) 251 goto err_dp; 252 253 ret = zynqmp_dpsub_drm_init(dpsub); 254 if (ret) 255 goto err_disp; 256 257 dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed"); 258 259 return 0; 260 261 err_disp: 262 zynqmp_disp_remove(dpsub); 263 err_dp: 264 zynqmp_dp_remove(dpsub); 265 err_pm: 266 pm_runtime_disable(&pdev->dev); 267 clk_disable_unprepare(dpsub->apb_clk); 268 err_mem: 269 of_reserved_mem_device_release(&pdev->dev); 270 return ret; 271 } 272 273 static int zynqmp_dpsub_remove(struct platform_device *pdev) 274 { 275 struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); 276 struct drm_device *drm = &dpsub->drm; 277 278 drm_dev_unregister(drm); 279 drm_atomic_helper_shutdown(drm); 280 drm_kms_helper_poll_fini(drm); 281 282 zynqmp_disp_remove(dpsub); 283 zynqmp_dp_remove(dpsub); 284 285 pm_runtime_disable(&pdev->dev); 286 clk_disable_unprepare(dpsub->apb_clk); 287 of_reserved_mem_device_release(&pdev->dev); 288 289 drm_dev_put(drm); 290 291 return 0; 292 } 293 294 static void zynqmp_dpsub_shutdown(struct platform_device *pdev) 295 { 296 struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); 297 298 drm_atomic_helper_shutdown(&dpsub->drm); 299 } 300 301 static const struct of_device_id zynqmp_dpsub_of_match[] = { 302 { .compatible = "xlnx,zynqmp-dpsub-1.7", }, 303 { /* end of table */ }, 304 }; 305 MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match); 306 307 static struct platform_driver zynqmp_dpsub_driver = { 308 .probe = zynqmp_dpsub_probe, 309 .remove = zynqmp_dpsub_remove, 310 .shutdown = zynqmp_dpsub_shutdown, 311 .driver = { 312 .name = "zynqmp-dpsub", 313 .pm = &zynqmp_dpsub_pm_ops, 314 .of_match_table = zynqmp_dpsub_of_match, 315 }, 316 }; 317 318 module_platform_driver(zynqmp_dpsub_driver); 319 320 MODULE_AUTHOR("Xilinx, Inc."); 321 MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver"); 322 MODULE_LICENSE("GPL v2"); 323