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// 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 "mcdi.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);
cdx_mcdi = cdx_c->priv;
rproc_detach(cdx_mcdi->r5_rproc);
rproc_put(cdx_mcdi->r5_rproc);
}
static int cdx_rpmsg_cb(struct rpmsg_device *rpdev, void *data,
int len, void *priv, u32 src)
{
struct cdx_controller *cdx_c = dev_get_drvdata(&rpdev->dev);
struct cdx_mcdi *cdx_mcdi = cdx_c->priv;
if (len > MCDI_BUF_LEN)
return -EINVAL;
cdx_mcdi_process_cmd(cdx_mcdi, (struct cdx_dword *)data, len);
return 0;
}
static void cdx_rpmsg_post_probe_work(struct work_struct *work)
{
struct cdx_controller *cdx_c;
struct cdx_mcdi *cdx_mcdi;
cdx_mcdi = container_of(work, struct cdx_mcdi, work);
cdx_c = dev_get_drvdata(&cdx_mcdi->rpdev->dev);
cdx_rpmsg_post_probe(cdx_c);
}
static int cdx_rpmsg_probe(struct rpmsg_device *rpdev)
{
struct rpmsg_channel_info chinfo = {0};
struct cdx_controller *cdx_c;
struct cdx_mcdi *cdx_mcdi;
cdx_c = (struct cdx_controller *)cdx_rpmsg_id_table[0].driver_data;
cdx_mcdi = cdx_c->priv;
chinfo.src = RPMSG_ADDR_ANY;
chinfo.dst = rpdev->dst;
strscpy(chinfo.name, cdx_rpmsg_id_table[0].name,
strlen(cdx_rpmsg_id_table[0].name));
cdx_mcdi->ept = rpmsg_create_ept(rpdev, cdx_rpmsg_cb, NULL, chinfo);
if (!cdx_mcdi->ept) {
dev_err_probe(&rpdev->dev, -ENXIO,
"Failed to create ept for channel %s\n",
chinfo.name);
return -EINVAL;
}
cdx_mcdi->rpdev = rpdev;
dev_set_drvdata(&rpdev->dev, cdx_c);
schedule_work(&cdx_mcdi->work);
return 0;
}
static void cdx_rpmsg_remove(struct rpmsg_device *rpdev)
{
struct cdx_controller *cdx_c = dev_get_drvdata(&rpdev->dev);
struct cdx_mcdi *cdx_mcdi = cdx_c->priv;
flush_work(&cdx_mcdi->work);
cdx_rpmsg_pre_remove(cdx_c);
rpmsg_destroy_ept(cdx_mcdi->ept);
dev_set_drvdata(&rpdev->dev, NULL);
}
static struct rpmsg_driver cdx_rpmsg_driver = {
.drv.name = KBUILD_MODNAME,
.id_table = cdx_rpmsg_id_table,
.probe = cdx_rpmsg_probe,
.remove = cdx_rpmsg_remove,
.callback = cdx_rpmsg_cb,
};
int cdx_setup_rpmsg(struct platform_device *pdev)
{
struct cdx_controller *cdx_c;
struct cdx_mcdi *cdx_mcdi;
int ret;
/* Attach to remote processor */
ret = cdx_attach_to_rproc(pdev);
if (ret)
return ret;
cdx_c = platform_get_drvdata(pdev);
cdx_mcdi = cdx_c->priv;
/* Register RPMsg driver */
cdx_rpmsg_id_table[0].driver_data = (kernel_ulong_t)cdx_c;
INIT_WORK(&cdx_mcdi->work, cdx_rpmsg_post_probe_work);
ret = register_rpmsg_driver(&cdx_rpmsg_driver);
if (ret) {
dev_err(&pdev->dev,
"Failed to register cdx RPMsg driver: %d\n", ret);
cdx_detach_to_r5(pdev);
}
return ret;
}
void cdx_destroy_rpmsg(struct platform_device *pdev)
{
unregister_rpmsg_driver(&cdx_rpmsg_driver);
cdx_detach_to_r5(pdev);
}
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