drivers/cdx/controller/cdx_rpmsg.c

Source file repositories/reference/linux-study-clean/drivers/cdx/controller/cdx_rpmsg.c

File Facts

System
Linux kernel
Corpus path
drivers/cdx/controller/cdx_rpmsg.c
Extension
.c
Size
4596 bytes
Lines
203
Domain
Driver Families
Bucket
drivers/cdx
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * Platform driver for CDX bus.
 *
 * Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
 */

#include <linux/rpmsg.h>
#include <linux/remoteproc.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/cdx/cdx_bus.h>
#include <linux/module.h>

#include "../cdx.h"
#include "cdx_controller.h"
#include "mcdi_functions.h"
#include "mcdid.h"

static struct rpmsg_device_id cdx_rpmsg_id_table[] = {
	{ .name = "mcdi_ipc" },
	{ },
};
MODULE_DEVICE_TABLE(rpmsg, cdx_rpmsg_id_table);

int cdx_rpmsg_send(struct cdx_mcdi *cdx_mcdi,
		   const struct cdx_dword *hdr, size_t hdr_len,
		   const struct cdx_dword *sdu, size_t sdu_len)
{
	unsigned char *send_buf;
	int ret;

	send_buf = kzalloc(hdr_len + sdu_len, GFP_KERNEL);
	if (!send_buf)
		return -ENOMEM;

	memcpy(send_buf, hdr, hdr_len);
	memcpy(send_buf + hdr_len, sdu, sdu_len);

	ret = rpmsg_send(cdx_mcdi->ept, send_buf, hdr_len + sdu_len);
	kfree(send_buf);

	return ret;
}

static int cdx_attach_to_rproc(struct platform_device *pdev)
{
	struct device_node *r5_core_node;
	struct cdx_controller *cdx_c;
	struct cdx_mcdi *cdx_mcdi;
	struct device *dev;
	struct rproc *rp;
	int ret;

	dev = &pdev->dev;
	cdx_c = platform_get_drvdata(pdev);
	cdx_mcdi = cdx_c->priv;

	r5_core_node = of_parse_phandle(dev->of_node, "xlnx,rproc", 0);
	if (!r5_core_node) {
		dev_err(&pdev->dev, "xlnx,rproc: invalid phandle\n");
		return -EINVAL;
	}

	rp = rproc_get_by_phandle(r5_core_node->phandle);
	if (!rp) {
		ret = -EPROBE_DEFER;
		goto pdev_err;
	}

	/* Attach to remote processor */
	ret = rproc_boot(rp);
	if (ret) {
		dev_err(&pdev->dev, "Failed to attach to remote processor\n");
		rproc_put(rp);
		goto pdev_err;
	}

	cdx_mcdi->r5_rproc = rp;
pdev_err:
	of_node_put(r5_core_node);
	return ret;
}

static void cdx_detach_to_r5(struct platform_device *pdev)
{
	struct cdx_controller *cdx_c;
	struct cdx_mcdi *cdx_mcdi;

	cdx_c = platform_get_drvdata(pdev);

Annotation

Implementation Notes