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// SPDX-License-Identifier: GPL-2.0+
/*
* Microchip's PolarFire SoC (MPFS) System Controller Driver
*
* Copyright (C) 2026 Microchip Technology Inc. All rights reserved.
*
* Author: Jamie Gibbons <[email protected]>
*
*/
#include <dm.h>
#include <dm/device.h>
#include <dm/device_compat.h>
#include <dm/devres.h>
#include <linux/err.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/printk.h>
#include <mailbox.h>
#include <malloc.h>
#include <mpfs-mailbox.h>
#include <rng.h>
#include <string.h>
#define CMD_OPCODE 0x21
#define CMD_DATA_SIZE 0U
#define CMD_DATA NULL
#define MBOX_OFFSET 0U
#define RESP_OFFSET 0U
#define RNG_RESP_BYTES 32U
/**
* struct mpfs_rng_priv - Structure representing System Controller data.
* @mpfs_syscontroller_priv: System Controller
*/
struct mpfs_rng_priv {
struct mpfs_syscontroller_priv *sys_controller;
};
static int mpfs_rng_read(struct udevice *dev, void *data, size_t len)
{
struct mpfs_rng_priv *rng_priv = dev_get_priv(dev);
u32 response_msg[RNG_RESP_BYTES / sizeof(u32)];
size_t count = 0, copy_size;
int ret;
struct mpfs_mss_response response = {
.resp_status = 0U,
.resp_msg = (u32 *)response_msg,
.resp_size = RNG_RESP_BYTES,
};
struct mpfs_mss_msg msg = {
.cmd_opcode = CMD_OPCODE,
.cmd_data_size = CMD_DATA_SIZE,
.response = &response,
.cmd_data = CMD_DATA,
.mbox_offset = MBOX_OFFSET,
.resp_offset = RESP_OFFSET,
};
while (count < len) {
ret = mpfs_syscontroller_run_service(rng_priv->sys_controller, &msg);
if (ret)
return ret;
ret = mpfs_syscontroller_recv_response(rng_priv->sys_controller, &msg, 1000);
if (ret)
return ret;
copy_size = (len - count > RNG_RESP_BYTES) ? RNG_RESP_BYTES : (len - count);
memcpy((u8 *)data + count, response_msg, copy_size);
count += copy_size;
}
return 0;
}
static int mpfs_rng_probe(struct udevice *dev)
{
struct mpfs_rng_priv *rng_priv = dev_get_priv(dev);
rng_priv->sys_controller = mpfs_syscontroller_get(dev->parent);
if (IS_ERR(rng_priv->sys_controller)) {
dev_err(dev, "Failed to get system controller\n");
return PTR_ERR(rng_priv->sys_controller);
}
return 0;
}
static const struct dm_rng_ops mpfs_rng_ops = {
.read = mpfs_rng_read,
};
U_BOOT_DRIVER(mpfs_rng) = {
.name = "mpfs_rng",
.id = UCLASS_RNG,
.probe = mpfs_rng_probe,
.priv_auto = sizeof(struct mpfs_rng_priv),
.ops = &mpfs_rng_ops,
};
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