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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
89 lines
1.9 KiB
C
89 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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