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 return ret; 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 return ret; 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 return ret; 158 } 159 160 /* ----------------------------------------------------------------------------- 161 * Power Management 162 */ 163 164 static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev) 165 { 166 struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev); 167 168 return drm_mode_config_helper_suspend(&dpsub->drm); 169 } 170 171 static int __maybe_unused zynqmp_dpsub_resume(struct device *dev) 172 { 173 struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev); 174 175 return drm_mode_config_helper_resume(&dpsub->drm); 176 } 177 178 static const struct dev_pm_ops zynqmp_dpsub_pm_ops = { 179 SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume) 180 }; 181 182 /* ----------------------------------------------------------------------------- 183 * Probe & Remove 184 */ 185 186 static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub) 187 { 188 int ret; 189 190 dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk"); 191 if (IS_ERR(dpsub->apb_clk)) 192 return PTR_ERR(dpsub->apb_clk); 193 194 ret = clk_prepare_enable(dpsub->apb_clk); 195 if (ret) { 196 dev_err(dpsub->dev, "failed to enable the APB clock\n"); 197 return ret; 198 } 199 200 return 0; 201 } 202 203 static int zynqmp_dpsub_probe(struct platform_device *pdev) 204 { 205 struct zynqmp_dpsub *dpsub; 206 int ret; 207 208 /* Allocate private data. */ 209 dpsub = devm_drm_dev_alloc(&pdev->dev, &zynqmp_dpsub_drm_driver, 210 struct zynqmp_dpsub, drm); 211 if (IS_ERR(dpsub)) 212 return PTR_ERR(dpsub); 213 214 dpsub->dev = &pdev->dev; 215 platform_set_drvdata(pdev, dpsub); 216 217 dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT)); 218 219 /* Try the reserved memory. Proceed if there's none. */ 220 of_reserved_mem_device_init(&pdev->dev); 221 222 ret = zynqmp_dpsub_init_clocks(dpsub); 223 if (ret < 0) 224 goto err_mem; 225 226 pm_runtime_enable(&pdev->dev); 227 228 /* 229 * DP should be probed first so that the zynqmp_disp can set the output 230 * format accordingly. 231 */ 232 ret = zynqmp_dp_probe(dpsub, &dpsub->drm); 233 if (ret) 234 goto err_pm; 235 236 ret = zynqmp_disp_probe(dpsub, &dpsub->drm); 237 if (ret) 238 goto err_dp; 239 240 ret = zynqmp_dpsub_drm_init(dpsub); 241 if (ret) 242 goto err_disp; 243 244 dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed"); 245 246 return 0; 247 248 err_disp: 249 zynqmp_disp_remove(dpsub); 250 err_dp: 251 zynqmp_dp_remove(dpsub); 252 err_pm: 253 pm_runtime_disable(&pdev->dev); 254 clk_disable_unprepare(dpsub->apb_clk); 255 err_mem: 256 of_reserved_mem_device_release(&pdev->dev); 257 return ret; 258 } 259 260 static int zynqmp_dpsub_remove(struct platform_device *pdev) 261 { 262 struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); 263 struct drm_device *drm = &dpsub->drm; 264 265 drm_dev_unregister(drm); 266 drm_atomic_helper_shutdown(drm); 267 drm_kms_helper_poll_fini(drm); 268 269 zynqmp_disp_remove(dpsub); 270 zynqmp_dp_remove(dpsub); 271 272 pm_runtime_disable(&pdev->dev); 273 clk_disable_unprepare(dpsub->apb_clk); 274 of_reserved_mem_device_release(&pdev->dev); 275 276 return 0; 277 } 278 279 static void zynqmp_dpsub_shutdown(struct platform_device *pdev) 280 { 281 struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev); 282 283 drm_atomic_helper_shutdown(&dpsub->drm); 284 } 285 286 static const struct of_device_id zynqmp_dpsub_of_match[] = { 287 { .compatible = "xlnx,zynqmp-dpsub-1.7", }, 288 { /* end of table */ }, 289 }; 290 MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match); 291 292 static struct platform_driver zynqmp_dpsub_driver = { 293 .probe = zynqmp_dpsub_probe, 294 .remove = zynqmp_dpsub_remove, 295 .shutdown = zynqmp_dpsub_shutdown, 296 .driver = { 297 .name = "zynqmp-dpsub", 298 .pm = &zynqmp_dpsub_pm_ops, 299 .of_match_table = zynqmp_dpsub_of_match, 300 }, 301 }; 302 303 module_platform_driver(zynqmp_dpsub_driver); 304 305 MODULE_AUTHOR("Xilinx, Inc."); 306 MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver"); 307 MODULE_LICENSE("GPL v2"); 308