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// SPDX-License-Identifier: GPL-2.0
/*
* CDX host controller driver for AMD versal-net platform.
*
* Copyright (C) 2022-2023, Advanced Micro Devices, Inc.
*/
#include <linux/mod_devicetable.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/cdx/cdx_bus.h>
#include "cdx_controller.h"
#include "../cdx.h"
#include "mcdi_functions.h"
#include "mcdi.h"
static unsigned int cdx_mcdi_rpc_timeout(struct cdx_mcdi *cdx, unsigned int cmd)
{
return MCDI_RPC_TIMEOUT;
}
static void cdx_mcdi_request(struct cdx_mcdi *cdx,
const struct cdx_dword *hdr, size_t hdr_len,
const struct cdx_dword *sdu, size_t sdu_len)
{
if (cdx_rpmsg_send(cdx, hdr, hdr_len, sdu, sdu_len))
dev_err(&cdx->rpdev->dev, "Failed to send rpmsg data\n");
}
static const struct cdx_mcdi_ops mcdi_ops = {
.mcdi_rpc_timeout = cdx_mcdi_rpc_timeout,
.mcdi_request = cdx_mcdi_request,
};
void cdx_rpmsg_post_probe(struct cdx_controller *cdx)
{
/* Register CDX controller with CDX bus driver */
if (cdx_register_controller(cdx))
dev_err(cdx->dev, "Failed to register CDX controller\n");
}
void cdx_rpmsg_pre_remove(struct cdx_controller *cdx)
{
cdx_unregister_controller(cdx);
cdx_mcdi_wait_for_quiescence(cdx->priv, MCDI_RPC_TIMEOUT);
}
static int cdx_configure_device(struct cdx_controller *cdx,
u8 bus_num, u8 dev_num,
struct cdx_device_config *dev_config)
{
int ret = 0;
switch (dev_config->type) {
case CDX_DEV_RESET_CONF:
ret = cdx_mcdi_reset_device(cdx->priv, bus_num, dev_num);
break;
case CDX_DEV_BUS_MASTER_CONF:
ret = cdx_mcdi_bus_master_enable(cdx->priv, bus_num, dev_num,
dev_config->bus_master_enable);
break;
default:
ret = -EINVAL;
}
return ret;
}
static int cdx_scan_devices(struct cdx_controller *cdx)
{
struct cdx_mcdi *cdx_mcdi = cdx->priv;
u8 bus_num, dev_num, num_cdx_bus;
int ret;
/* MCDI FW Read: Fetch the number of CDX buses on this controller */
ret = cdx_mcdi_get_num_buses(cdx_mcdi);
if (ret < 0) {
dev_err(cdx->dev,
"Get number of CDX buses failed: %d\n", ret);
return ret;
}
num_cdx_bus = (u8)ret;
for (bus_num = 0; bus_num < num_cdx_bus; bus_num++) {
u8 num_cdx_dev;
/* MCDI FW Read: Fetch the number of devices present */
ret = cdx_mcdi_get_num_devs(cdx_mcdi, bus_num);
if (ret < 0) {
dev_err(cdx->dev,
"Get devices on CDX bus %d failed: %d\n", bus_num, ret);
continue;
}
num_cdx_dev = (u8)ret;
for (dev_num = 0; dev_num < num_cdx_dev; dev_num++) {
struct cdx_dev_params dev_params;
/* MCDI FW: Get the device config */
ret = cdx_mcdi_get_dev_config(cdx_mcdi, bus_num,
dev_num, &dev_params);
if (ret) {
dev_err(cdx->dev,
"CDX device config get failed for %d(bus):%d(dev), %d\n",
bus_num, dev_num, ret);
continue;
}
dev_params.cdx = cdx;
/* Add the device to the cdx bus */
ret = cdx_device_add(&dev_params);
if (ret) {
dev_err(cdx->dev, "registering cdx dev: %d failed: %d\n",
dev_num, ret);
continue;
}
dev_dbg(cdx->dev, "CDX dev: %d on cdx bus: %d created\n",
dev_num, bus_num);
}
}
return 0;
}
static struct cdx_ops cdx_ops = {
.scan = cdx_scan_devices,
.dev_configure = cdx_configure_device,
};
static int xlnx_cdx_probe(struct platform_device *pdev)
{
struct cdx_controller *cdx;
struct cdx_mcdi *cdx_mcdi;
int ret;
cdx_mcdi = kzalloc(sizeof(*cdx_mcdi), GFP_KERNEL);
if (!cdx_mcdi)
return -ENOMEM;
/* Store the MCDI ops */
cdx_mcdi->mcdi_ops = &mcdi_ops;
/* MCDI FW: Initialize the FW path */
ret = cdx_mcdi_init(cdx_mcdi);
if (ret) {
dev_err_probe(&pdev->dev, ret, "MCDI Initialization failed\n");
goto mcdi_init_fail;
}
cdx = kzalloc(sizeof(*cdx), GFP_KERNEL);
if (!cdx) {
ret = -ENOMEM;
goto cdx_alloc_fail;
}
platform_set_drvdata(pdev, cdx);
cdx->dev = &pdev->dev;
cdx->priv = cdx_mcdi;
cdx->ops = &cdx_ops;
ret = cdx_setup_rpmsg(pdev);
if (ret) {
if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev, "Failed to register CDX RPMsg transport\n");
goto cdx_rpmsg_fail;
}
dev_info(&pdev->dev, "Successfully registered CDX controller with RPMsg as transport\n");
return 0;
cdx_rpmsg_fail:
kfree(cdx);
cdx_alloc_fail:
cdx_mcdi_finish(cdx_mcdi);
mcdi_init_fail:
kfree(cdx_mcdi);
return ret;
}
static int xlnx_cdx_remove(struct platform_device *pdev)
{
struct cdx_controller *cdx = platform_get_drvdata(pdev);
struct cdx_mcdi *cdx_mcdi = cdx->priv;
cdx_destroy_rpmsg(pdev);
kfree(cdx);
cdx_mcdi_finish(cdx_mcdi);
kfree(cdx_mcdi);
return 0;
}
static const struct of_device_id cdx_match_table[] = {
{.compatible = "xlnx,versal-net-cdx",},
{ },
};
MODULE_DEVICE_TABLE(of, cdx_match_table);
static struct platform_driver cdx_pdriver = {
.driver = {
.name = "cdx-controller",
.pm = NULL,
.of_match_table = cdx_match_table,
},
.probe = xlnx_cdx_probe,
.remove = xlnx_cdx_remove,
};
static int __init cdx_controller_init(void)
{
int ret;
ret = platform_driver_register(&cdx_pdriver);
if (ret)
pr_err("platform_driver_register() failed: %d\n", ret);
return ret;
}
static void __exit cdx_controller_exit(void)
{
platform_driver_unregister(&cdx_pdriver);
}
module_init(cdx_controller_init);
module_exit(cdx_controller_exit);
MODULE_AUTHOR("AMD Inc.");
MODULE_DESCRIPTION("CDX controller for AMD devices");
MODULE_LICENSE("GPL");
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