[PATCH v2] xilinx: zynqmp: Extract aes operation into new file

[Michal Simek]

On 7/10/23 16:09, christian.taedcke-oss at weidmueller.com wrote:
> From: Christian Taedcke <christian.taedcke at weidmueller.com>
> 
> This moves the aes operation that is performed by the pmu into a
> separate file. This way it can be called not just from the shell
> command, but also e.g. from board initialization code.
> 
> Signed-off-by: Christian Taedcke <christian.taedcke at weidmueller.com>
> ---
> 
> Changes in v2:
> - convert doxygen comments to kernel-doc
> - fix typos
> - fix header license
> - fix do_zynqmp_aes() return value
> 
>   arch/arm/mach-zynqmp/Makefile                 |  3 +-
>   arch/arm/mach-zynqmp/aes.c                    | 58 +++++++++++++++++++
>   .../arm/mach-zynqmp/include/mach/zynqmp_aes.h | 32 ++++++++++
>   board/xilinx/zynqmp/cmds.c                    | 43 +-------------
>   4 files changed, 94 insertions(+), 42 deletions(-)
>   create mode 100644 arch/arm/mach-zynqmp/aes.c
>   create mode 100644 arch/arm/mach-zynqmp/include/mach/zynqmp_aes.h
> 
> diff --git a/arch/arm/mach-zynqmp/Makefile b/arch/arm/mach-zynqmp/Makefile
> index bb1830c846..1a76493bef 100644
> --- a/arch/arm/mach-zynqmp/Makefile
> +++ b/arch/arm/mach-zynqmp/Makefile
> @@ -3,8 +3,7 @@
>   # (C) Copyright 2014 - 2015 Xilinx, Inc.
>   # Michal Simek <michal.simek at xilinx.com>
>   
> -obj-y	+= clk.o
> -obj-y	+= cpu.o
> +obj-y	+= aes.o clk.o cpu.o
>   obj-$(CONFIG_MP)	+= mp.o
>   obj-$(CONFIG_SPL_BUILD) += spl.o handoff.o psu_spl_init.o
>   obj-$(CONFIG_SPL_ZYNQMP_DRAM_ECC_INIT) += ecc_spl_init.o
> diff --git a/arch/arm/mach-zynqmp/aes.c b/arch/arm/mach-zynqmp/aes.c
> new file mode 100644
> index 0000000000..115bca8338
> --- /dev/null
> +++ b/arch/arm/mach-zynqmp/aes.c
> @@ -0,0 +1,58 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * (C) Copyright 2018 Xilinx, Inc.
> + * Siva Durga Prasad Paladugu <siva.durga.paladugu at xilinx.com>
> + *
> + * Copyright (C) 2023 Weidmueller Interface GmbH & Co. KG <oss at weidmueller.com>
> + * Christian Taedcke <christian.taedcke at weidmueller.com>
> + */
> +
> +#include <common.h>
> +#include <mach/zynqmp_aes.h>
> +
> +#include <asm/arch/sys_proto.h>
> +#include <cpu_func.h>
> +#include <memalign.h>
> +#include <zynqmp_firmware.h>
> +
> +int zynqmp_aes_operation(struct zynqmp_aes *aes)
> +{
> +	u32 ret_payload[PAYLOAD_ARG_CNT];
> +	int ret;
> +
> +	if (zynqmp_firmware_version() <= PMUFW_V1_0)
> +		return -ENOENT;
> +
> +	if (aes->srcaddr && aes->ivaddr && aes->dstaddr) {
> +		flush_dcache_range(aes->srcaddr,
> +				   (aes->srcaddr +
> +				    roundup(aes->len, ARCH_DMA_MINALIGN)));
> +		flush_dcache_range(aes->ivaddr,
> +				   (aes->ivaddr +
> +				    roundup(IV_SIZE, ARCH_DMA_MINALIGN)));
> +		flush_dcache_range(aes->dstaddr,
> +				   (aes->dstaddr +
> +				    roundup(aes->len, ARCH_DMA_MINALIGN)));
> +	}
> +
> +	if (aes->keysrc == 0) {
> +		if (aes->keyaddr == 0)
> +			return -EINVAL;
> +
> +		flush_dcache_range(aes->keyaddr, (aes->keyaddr +
> +						   roundup(KEY_PTR_LEN, ARCH_DMA_MINALIGN)));
> +	}
> +
> +	flush_dcache_range((ulong)aes, (ulong)(aes) +
> +			   roundup(sizeof(struct zynqmp_aes), ARCH_DMA_MINALIGN));
> +
> +	ret = xilinx_pm_request(PM_SECURE_AES, upper_32_bits((ulong)aes),
> +				lower_32_bits((ulong)aes), 0, 0, ret_payload);
> +	if (ret || ret_payload[1]) {
> +		printf("Failed: AES op status:0x%x, errcode:0x%x\n",
> +		       ret, ret_payload[1]);
> +		return -EIO;
> +	}
> +
> +	return 0;
> +}
> diff --git a/arch/arm/mach-zynqmp/include/mach/zynqmp_aes.h b/arch/arm/mach-zynqmp/include/mach/zynqmp_aes.h
> new file mode 100644
> index 0000000000..5bffb6b64c
> --- /dev/null
> +++ b/arch/arm/mach-zynqmp/include/mach/zynqmp_aes.h
> @@ -0,0 +1,32 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2023 Weidmueller Interface GmbH & Co. KG <oss at weidmueller.com>
> + * Christian Taedcke <christian.taedcke at weidmueller.com>
> + *
> + * Declaration of AES operation functionality for ZynqMP.
> + */
> +
> +#ifndef ZYNQMP_AES_H
> +#define ZYNQMP_AES_H
> +
> +struct zynqmp_aes {
> +	u64 srcaddr;
> +	u64 ivaddr;
> +	u64 keyaddr;
> +	u64 dstaddr;
> +	u64 len;
> +	u64 op;
> +	u64 keysrc;
> +};
> +
> +/*

Should start with /**

> + * Performs an aes operation using the pmu firmware
> + *
> + * @aes The aes operation buffer that must have been allocated using
> + *      ALLOC_CACHE_ALIGN_BUFFER(struct zynqmp_aes, aes, 1).
> + *
> + * Return: 0 in case of success, in case of an error any other value
> + */

Not a kernel-doc format.
./scripts/kernel-doc -man -v 2>/dev/null 
arch/arm/mach-zynqmp/include/mach/zynqmp_aes.h


The rest looks good.

M