diff options
| -rw-r--r-- | drivers/rng/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/rng/Makefile | 1 | ||||
| -rw-r--r-- | drivers/rng/mpfs_rng.c | 101 |
3 files changed, 109 insertions, 0 deletions
diff --git a/drivers/rng/Kconfig b/drivers/rng/Kconfig index 19b2b707677..bacb026308b 100644 --- a/drivers/rng/Kconfig +++ b/drivers/rng/Kconfig @@ -23,6 +23,13 @@ config RNG_MESON Enable support for hardware random number generator of Amlogic Meson SoCs. +config RNG_MPFS + bool "Microchip PolarFire SoC Random Number Generator support" + depends on DM_RNG && MPFS_SYSCONTROLLER + help + Enable support for hardware random number generator + of Microchip's PolarFire SoCs. + config RNG_SANDBOX bool "Sandbox random number generator" depends on SANDBOX diff --git a/drivers/rng/Makefile b/drivers/rng/Makefile index 30c58272d41..50622d4705f 100644 --- a/drivers/rng/Makefile +++ b/drivers/rng/Makefile @@ -5,6 +5,7 @@ obj-$(CONFIG_$(PHASE_)DM_RNG) += rng-uclass.o obj-$(CONFIG_RNG_MESON) += meson-rng.o +obj-$(CONFIG_RNG_MPFS) += mpfs_rng.o obj-$(CONFIG_RNG_SANDBOX) += sandbox_rng.o obj-$(CONFIG_RNG_MSM) += msm_rng.o obj-$(CONFIG_RNG_NPCM) += npcm_rng.o diff --git a/drivers/rng/mpfs_rng.c b/drivers/rng/mpfs_rng.c new file mode 100644 index 00000000000..820103a0202 --- /dev/null +++ b/drivers/rng/mpfs_rng.c @@ -0,0 +1,101 @@ +// 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, +}; |