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https://github.com/AsahiLinux/u-boot
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
88 lines
1.9 KiB
C
88 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (c) 2020 Michael Walle <michael@walle.cc>
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*
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* Driver for Freescale Cryptographic Accelerator and Assurance
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* Module (CAAM) hardware random number generator.
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*/
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#include <asm/cache.h>
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#include <common.h>
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#include <cpu_func.h>
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#include <dm.h>
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#include <rng.h>
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#include <linux/kernel.h>
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#include "desc_constr.h"
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#include "jobdesc.h"
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#include "jr.h"
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#define CAAM_RNG_MAX_FIFO_STORE_SIZE 16
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#define CAAM_RNG_DESC_LEN (3 * CAAM_CMD_SZ + CAAM_PTR_SZ)
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struct caam_rng_priv {
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u32 desc[CAAM_RNG_DESC_LEN / 4];
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u8 data[CAAM_RNG_MAX_FIFO_STORE_SIZE] __aligned(ARCH_DMA_MINALIGN);
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};
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static int caam_rng_read_one(struct caam_rng_priv *priv)
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{
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int size = ALIGN(CAAM_RNG_MAX_FIFO_STORE_SIZE, ARCH_DMA_MINALIGN);
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int ret;
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ret = run_descriptor_jr(priv->desc);
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if (ret < 0)
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return -EIO;
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invalidate_dcache_range((unsigned long)priv->data,
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(unsigned long)priv->data + size);
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return 0;
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}
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static int caam_rng_read(struct udevice *dev, void *data, size_t len)
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{
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struct caam_rng_priv *priv = dev_get_priv(dev);
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u8 *buffer = data;
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size_t size;
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int ret;
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while (len) {
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ret = caam_rng_read_one(priv);
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if (ret)
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return ret;
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size = min(len, (size_t)CAAM_RNG_MAX_FIFO_STORE_SIZE);
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memcpy(buffer, priv->data, size);
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buffer += size;
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len -= size;
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}
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return 0;
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}
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static int caam_rng_probe(struct udevice *dev)
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{
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struct caam_rng_priv *priv = dev_get_priv(dev);
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ulong size = ALIGN(CAAM_RNG_DESC_LEN, ARCH_DMA_MINALIGN);
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inline_cnstr_jobdesc_rng(priv->desc, priv->data,
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CAAM_RNG_MAX_FIFO_STORE_SIZE);
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flush_dcache_range((unsigned long)priv->desc,
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(unsigned long)priv->desc + size);
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return 0;
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}
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static const struct dm_rng_ops caam_rng_ops = {
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.read = caam_rng_read,
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};
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U_BOOT_DRIVER(caam_rng) = {
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.name = "caam-rng",
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.id = UCLASS_RNG,
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.ops = &caam_rng_ops,
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.probe = caam_rng_probe,
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.priv_auto = sizeof(struct caam_rng_priv),
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.flags = DM_FLAG_ALLOC_PRIV_DMA,
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};
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