drivers/gpu/drm/xlnx/zynqmp_dpsub.c

   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");