linux-nv-oot/drivers/video/tegra/host/capture/capture-support.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Capture support for syncpoint and GoS management
 *
 * SPDX-FileCopyrightText: Copyright (c) 2017-2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
 */

#include <nvidia/conftest.h>

#include "capture-support.h"
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/export.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <soc/tegra/camrtc-capture.h>
#include <linux/version.h>
#include <soc/tegra/fuse.h>
#include <linux/nvhost.h>

int capture_alloc_syncpt(struct platform_device *pdev,
			const char *name,
			uint32_t *syncpt_id)
{
	uint32_t id;

	if (syncpt_id == NULL) {
		dev_err(&pdev->dev, "%s: null argument\n", __func__);
		return -EINVAL;
	}

	id = nvhost_get_syncpt_client_managed(pdev, name);
	if (id == 0) {
		dev_err(&pdev->dev, "%s: syncpt allocation failed\n", __func__);
		return -ENODEV;
	}

	*syncpt_id = id;

	return 0;
}
EXPORT_SYMBOL_GPL(capture_alloc_syncpt);

void capture_release_syncpt(struct platform_device *pdev, uint32_t id)
{
	dev_dbg(&pdev->dev, "%s: id=%u\n", __func__, id);
	nvhost_syncpt_put_ref_ext(pdev, id);
}
EXPORT_SYMBOL_GPL(capture_release_syncpt);

void capture_get_gos_table(struct platform_device *pdev,
				int *gos_count,
				const dma_addr_t **gos_table)
{
	int count = 0;
	dma_addr_t *table = NULL;

	*gos_count = count;
	*gos_table = table;
}
EXPORT_SYMBOL_GPL(capture_get_gos_table);

int capture_get_syncpt_gos_backing(struct platform_device *pdev,
			uint32_t id,
			dma_addr_t *syncpt_addr,
			uint32_t *gos_index,
			uint32_t *gos_offset)
{
	uint32_t index = GOS_INDEX_INVALID;
	uint32_t offset = 0;
	dma_addr_t addr;

	if (id == 0) {
		dev_err(&pdev->dev, "%s: syncpt id is invalid\n", __func__);
		return -EINVAL;
	}

	if (syncpt_addr == NULL || gos_index == NULL || gos_offset == NULL) {
		dev_err(&pdev->dev, "%s: null arguments\n", __func__);
		return -EINVAL;
	}

	addr = nvhost_syncpt_address(pdev, id);

	*syncpt_addr = addr;
	*gos_index = index;
	*gos_offset = offset;

	dev_dbg(&pdev->dev, "%s: id=%u addr=0x%llx gos_idx=%u gos_offset=%u\n",
		__func__, id, addr, index, offset);

	return 0;
}
EXPORT_SYMBOL_GPL(capture_get_syncpt_gos_backing);

static int capture_support_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct nvhost_device_data *info;
	int err = 0;

	info = (void *)of_device_get_match_data(dev);
	if (WARN_ON(info == NULL))
		return -ENODATA;

	info->pdev = pdev;
	mutex_init(&info->lock);
	platform_set_drvdata(pdev, info);

	(void) dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(39));

	err = nvhost_client_device_get_resources(pdev);
	if (err)
		goto error;

	err = nvhost_module_init(pdev);
	if (err)
		goto error;

	err = nvhost_client_device_init(pdev);
	if (err) {
		nvhost_module_deinit(pdev);
		goto error;
	}

	err = nvhost_syncpt_unit_interface_init(pdev);
	if (err)
		goto device_release;

	return 0;

device_release:
	nvhost_client_device_release(pdev);
error:
	if (err != -EPROBE_DEFER)
		dev_err(dev, "probe failed: %d\n", err);
	return err;
}

static int capture_support_remove(struct platform_device *pdev)
{
	return 0;
}

struct nvhost_device_data t19_isp_thi_info = {
	.devfs_name		= "isp-thi",
	.moduleid		= 4, //NVHOST_MODULE_ISP,
};

struct nvhost_device_data t19_vi_thi_info = {
	.devfs_name		= "vi-thi",
	.moduleid		= 2, //NVHOST_MODULE_VI,
};

struct nvhost_device_data t23x_vi0_thi_info = {
	.devfs_name		= "vi0-thi",
	.moduleid		= 2, //NVHOST_MODULE_VI,
};

struct nvhost_device_data t23x_vi1_thi_info = {
	.devfs_name		= "vi1-thi",
	.moduleid		= 3, //NVHOST_MODULE_VI2,
};

static const struct of_device_id capture_support_match[] = {
	{
		.compatible = "nvidia,tegra194-isp-thi",
		.data = &t19_isp_thi_info,
	},
	{
		.compatible = "nvidia,tegra194-vi-thi",
		.data = &t19_vi_thi_info,
	},
	{
		.name = "vi0-thi",
		.compatible = "nvidia,tegra234-vi-thi",
		.data = &t23x_vi0_thi_info,
	},
	{
		.name = "vi1-thi",
		.compatible = "nvidia,tegra234-vi-thi",
		.data = &t23x_vi1_thi_info,
	},
	{ },
};
MODULE_DEVICE_TABLE(of, capture_support_match);

#if defined(NV_PLATFORM_DRIVER_STRUCT_REMOVE_RETURNS_VOID) /* Linux v6.11 */
static void capture_support_remove_wrapper(struct platform_device *pdev)
{
	capture_support_remove(pdev);
}
#else
static int capture_support_remove_wrapper(struct platform_device *pdev)
{
	return capture_support_remove(pdev);
}
#endif

static struct platform_driver capture_support_driver = {
	.probe = capture_support_probe,
	.remove = capture_support_remove_wrapper,
	.driver = {
		/* Only suitable name for dummy falcon driver */
		.name = "scare-pigeon",
		.of_match_table = capture_support_match,
		.pm = &nvhost_module_pm_ops,
	},
};

module_platform_driver(capture_support_driver);
MODULE_LICENSE("GPL");