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- // SPDX-License-Identifier: GPL-2.0
- /*
- * ZynqMP DisplayPort Subsystem Driver
- *
- * Copyright (C) 2017 - 2020 Xilinx, Inc.
- *
- * Authors:
- * - Hyun Woo Kwon <hyun.kwon@xilinx.com>
- * - Laurent Pinchart <laurent.pinchart@ideasonboard.com>
- */
- #include <linux/clk.h>
- #include <linux/dma-mapping.h>
- #include <linux/module.h>
- #include <linux/of_reserved_mem.h>
- #include <linux/platform_device.h>
- #include <linux/pm_runtime.h>
- #include <drm/drm_atomic_helper.h>
- #include <drm/drm_device.h>
- #include <drm/drm_drv.h>
- #include <drm/drm_fb_helper.h>
- #include <drm/drm_fourcc.h>
- #include <drm/drm_gem_cma_helper.h>
- #include <drm/drm_gem_framebuffer_helper.h>
- #include <drm/drm_managed.h>
- #include <drm/drm_mode_config.h>
- #include <drm/drm_probe_helper.h>
- #include <drm/drm_vblank.h>
- #include "zynqmp_disp.h"
- #include "zynqmp_dp.h"
- #include "zynqmp_dpsub.h"
- /* -----------------------------------------------------------------------------
- * Dumb Buffer & Framebuffer Allocation
- */
- static int zynqmp_dpsub_dumb_create(struct drm_file *file_priv,
- struct drm_device *drm,
- struct drm_mode_create_dumb *args)
- {
- struct zynqmp_dpsub *dpsub = to_zynqmp_dpsub(drm);
- unsigned int pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
- /* Enforce the alignment constraints of the DMA engine. */
- args->pitch = ALIGN(pitch, dpsub->dma_align);
- return drm_gem_cma_dumb_create_internal(file_priv, drm, args);
- }
- static struct drm_framebuffer *
- zynqmp_dpsub_fb_create(struct drm_device *drm, struct drm_file *file_priv,
- const struct drm_mode_fb_cmd2 *mode_cmd)
- {
- struct zynqmp_dpsub *dpsub = to_zynqmp_dpsub(drm);
- struct drm_mode_fb_cmd2 cmd = *mode_cmd;
- unsigned int i;
- /* Enforce the alignment constraints of the DMA engine. */
- for (i = 0; i < ARRAY_SIZE(cmd.pitches); ++i)
- cmd.pitches[i] = ALIGN(cmd.pitches[i], dpsub->dma_align);
- return drm_gem_fb_create(drm, file_priv, &cmd);
- }
- static const struct drm_mode_config_funcs zynqmp_dpsub_mode_config_funcs = {
- .fb_create = zynqmp_dpsub_fb_create,
- .atomic_check = drm_atomic_helper_check,
- .atomic_commit = drm_atomic_helper_commit,
- };
- /* -----------------------------------------------------------------------------
- * DRM/KMS Driver
- */
- DEFINE_DRM_GEM_CMA_FOPS(zynqmp_dpsub_drm_fops);
- static struct drm_driver zynqmp_dpsub_drm_driver = {
- .driver_features = DRIVER_MODESET | DRIVER_GEM |
- DRIVER_ATOMIC,
- .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
- .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
- .gem_prime_export = drm_gem_prime_export,
- .gem_prime_import = drm_gem_prime_import,
- .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
- .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
- .gem_prime_vmap = drm_gem_cma_prime_vmap,
- .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
- .gem_prime_mmap = drm_gem_cma_prime_mmap,
- .gem_free_object_unlocked = drm_gem_cma_free_object,
- .gem_vm_ops = &drm_gem_cma_vm_ops,
- .dumb_create = zynqmp_dpsub_dumb_create,
- .dumb_destroy = drm_gem_dumb_destroy,
- .fops = &zynqmp_dpsub_drm_fops,
- .name = "zynqmp-dpsub",
- .desc = "Xilinx DisplayPort Subsystem Driver",
- .date = "20130509",
- .major = 1,
- .minor = 0,
- };
- static int zynqmp_dpsub_drm_init(struct zynqmp_dpsub *dpsub)
- {
- struct drm_device *drm = &dpsub->drm;
- int ret;
- /* Initialize mode config, vblank and the KMS poll helper. */
- ret = drmm_mode_config_init(drm);
- if (ret < 0)
- return ret;
- drm->mode_config.funcs = &zynqmp_dpsub_mode_config_funcs;
- drm->mode_config.min_width = 0;
- drm->mode_config.min_height = 0;
- drm->mode_config.max_width = ZYNQMP_DISP_MAX_WIDTH;
- drm->mode_config.max_height = ZYNQMP_DISP_MAX_HEIGHT;
- ret = drm_vblank_init(drm, 1);
- if (ret)
- return ret;
- drm->irq_enabled = 1;
- drm_kms_helper_poll_init(drm);
- /*
- * Initialize the DISP and DP components. This will creates planes,
- * CRTC, encoder and connector. The DISP should be initialized first as
- * the DP encoder needs the CRTC.
- */
- ret = zynqmp_disp_drm_init(dpsub);
- if (ret)
- goto err_poll_fini;
- ret = zynqmp_dp_drm_init(dpsub);
- if (ret)
- goto err_poll_fini;
- /* Reset all components and register the DRM device. */
- drm_mode_config_reset(drm);
- ret = drm_dev_register(drm, 0);
- if (ret < 0)
- goto err_poll_fini;
- /* Initialize fbdev generic emulation. */
- drm_fbdev_generic_setup(drm, 24);
- return 0;
- err_poll_fini:
- drm_kms_helper_poll_fini(drm);
- return ret;
- }
- /* -----------------------------------------------------------------------------
- * Power Management
- */
- static int __maybe_unused zynqmp_dpsub_suspend(struct device *dev)
- {
- struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
- return drm_mode_config_helper_suspend(&dpsub->drm);
- }
- static int __maybe_unused zynqmp_dpsub_resume(struct device *dev)
- {
- struct zynqmp_dpsub *dpsub = dev_get_drvdata(dev);
- return drm_mode_config_helper_resume(&dpsub->drm);
- }
- static const struct dev_pm_ops zynqmp_dpsub_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(zynqmp_dpsub_suspend, zynqmp_dpsub_resume)
- };
- /* -----------------------------------------------------------------------------
- * Probe & Remove
- */
- static int zynqmp_dpsub_init_clocks(struct zynqmp_dpsub *dpsub)
- {
- int ret;
- dpsub->apb_clk = devm_clk_get(dpsub->dev, "dp_apb_clk");
- if (IS_ERR(dpsub->apb_clk))
- return PTR_ERR(dpsub->apb_clk);
- ret = clk_prepare_enable(dpsub->apb_clk);
- if (ret) {
- dev_err(dpsub->dev, "failed to enable the APB clock\n");
- return ret;
- }
- return 0;
- }
- static int zynqmp_dpsub_probe(struct platform_device *pdev)
- {
- struct zynqmp_dpsub *dpsub;
- int ret;
- /* Allocate private data. */
- dpsub = devm_drm_dev_alloc(&pdev->dev, &zynqmp_dpsub_drm_driver,
- struct zynqmp_dpsub, drm);
- if (IS_ERR(dpsub))
- return PTR_ERR(dpsub);
- dpsub->dev = &pdev->dev;
- platform_set_drvdata(pdev, dpsub);
- dma_set_mask(dpsub->dev, DMA_BIT_MASK(ZYNQMP_DISP_MAX_DMA_BIT));
- /* Try the reserved memory. Proceed if there's none. */
- of_reserved_mem_device_init(&pdev->dev);
- ret = zynqmp_dpsub_init_clocks(dpsub);
- if (ret < 0)
- goto err_mem;
- pm_runtime_enable(&pdev->dev);
- /*
- * DP should be probed first so that the zynqmp_disp can set the output
- * format accordingly.
- */
- ret = zynqmp_dp_probe(dpsub, &dpsub->drm);
- if (ret)
- goto err_pm;
- ret = zynqmp_disp_probe(dpsub, &dpsub->drm);
- if (ret)
- goto err_dp;
- ret = zynqmp_dpsub_drm_init(dpsub);
- if (ret)
- goto err_disp;
- dev_info(&pdev->dev, "ZynqMP DisplayPort Subsystem driver probed");
- return 0;
- err_disp:
- zynqmp_disp_remove(dpsub);
- err_dp:
- zynqmp_dp_remove(dpsub);
- err_pm:
- pm_runtime_disable(&pdev->dev);
- clk_disable_unprepare(dpsub->apb_clk);
- err_mem:
- of_reserved_mem_device_release(&pdev->dev);
- return ret;
- }
- static int zynqmp_dpsub_remove(struct platform_device *pdev)
- {
- struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
- struct drm_device *drm = &dpsub->drm;
- drm_dev_unregister(drm);
- drm_atomic_helper_shutdown(drm);
- drm_kms_helper_poll_fini(drm);
- zynqmp_disp_remove(dpsub);
- zynqmp_dp_remove(dpsub);
- pm_runtime_disable(&pdev->dev);
- clk_disable_unprepare(dpsub->apb_clk);
- of_reserved_mem_device_release(&pdev->dev);
- return 0;
- }
- static void zynqmp_dpsub_shutdown(struct platform_device *pdev)
- {
- struct zynqmp_dpsub *dpsub = platform_get_drvdata(pdev);
- drm_atomic_helper_shutdown(&dpsub->drm);
- }
- static const struct of_device_id zynqmp_dpsub_of_match[] = {
- { .compatible = "xlnx,zynqmp-dpsub-1.7", },
- { /* end of table */ },
- };
- MODULE_DEVICE_TABLE(of, zynqmp_dpsub_of_match);
- static struct platform_driver zynqmp_dpsub_driver = {
- .probe = zynqmp_dpsub_probe,
- .remove = zynqmp_dpsub_remove,
- .shutdown = zynqmp_dpsub_shutdown,
- .driver = {
- .name = "zynqmp-dpsub",
- .pm = &zynqmp_dpsub_pm_ops,
- .of_match_table = zynqmp_dpsub_of_match,
- },
- };
- module_platform_driver(zynqmp_dpsub_driver);
- MODULE_AUTHOR("Xilinx, Inc.");
- MODULE_DESCRIPTION("ZynqMP DP Subsystem Driver");
- MODULE_LICENSE("GPL v2");
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