From patchwork Thu Oct 31 08:34:29 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xu Zaibo X-Patchwork-Id: 11220695 X-Patchwork-Delegate: herbert@gondor.apana.org.au Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D5DB51599 for ; Thu, 31 Oct 2019 08:38:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id BF09E2086D for ; Thu, 31 Oct 2019 08:38:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726774AbfJaIiR (ORCPT ); Thu, 31 Oct 2019 04:38:17 -0400 Received: from szxga07-in.huawei.com ([45.249.212.35]:41380 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726875AbfJaIiR (ORCPT ); Thu, 31 Oct 2019 04:38:17 -0400 Received: from DGGEMS413-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id B6AA78FC0D05FF5C53EF; Thu, 31 Oct 2019 16:38:14 +0800 (CST) Received: from localhost.localdomain (10.67.165.24) by DGGEMS413-HUB.china.huawei.com (10.3.19.213) with Microsoft SMTP Server id 14.3.439.0; Thu, 31 Oct 2019 16:38:03 +0800 From: Zaibo Xu To: , CC: , , , , , , Subject: [PATCH 1/2] hw_random: add HiSilicon TRNG driver support Date: Thu, 31 Oct 2019 16:34:29 +0800 Message-ID: <1572510870-40390-2-git-send-email-xuzaibo@huawei.com> X-Mailer: git-send-email 2.8.1 In-Reply-To: <1572510870-40390-1-git-send-email-xuzaibo@huawei.com> References: <1572510870-40390-1-git-send-email-xuzaibo@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.67.165.24] X-CFilter-Loop: Reflected Sender: linux-crypto-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org This series adds HiSilicon true random number generator(TRNG) driver in hw_random subsystem. Signed-off-by: Zaibo Xu Signed-off-by: Weili Qian --- drivers/char/hw_random/Kconfig | 13 +++++ drivers/char/hw_random/Makefile | 1 + drivers/char/hw_random/hisi-trng-v2.c | 99 +++++++++++++++++++++++++++++++++++ 3 files changed, 113 insertions(+) create mode 100644 drivers/char/hw_random/hisi-trng-v2.c diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index 87a1c30..7c7fecf 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -308,6 +308,19 @@ config HW_RANDOM_HISI If unsure, say Y. +config HW_RANDOM_HISI_V2 + tristate "HiSilicon True Random Number Generator V2 support" + depends on HW_RANDOM && ARM64 && ACPI + default HW_RANDOM + help + This driver provides kernel-side support for the True Random Number + Generator V2 hardware found on HiSilicon Hi1620 SoC. + + To compile this driver as a module, choose M here: the + module will be called hisi-trng-v2. + + If unsure, say Y. + config HW_RANDOM_ST tristate "ST Microelectronics HW Random Number Generator support" depends on HW_RANDOM && ARCH_STI diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index 17b6d4e..a7801b4 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -27,6 +27,7 @@ obj-$(CONFIG_HW_RANDOM_NOMADIK) += nomadik-rng.o obj-$(CONFIG_HW_RANDOM_PSERIES) += pseries-rng.o obj-$(CONFIG_HW_RANDOM_POWERNV) += powernv-rng.o obj-$(CONFIG_HW_RANDOM_HISI) += hisi-rng.o +obj-$(CONFIG_HW_RANDOM_HISI_V2) += hisi-trng-v2.o obj-$(CONFIG_HW_RANDOM_BCM2835) += bcm2835-rng.o obj-$(CONFIG_HW_RANDOM_IPROC_RNG200) += iproc-rng200.o obj-$(CONFIG_HW_RANDOM_ST) += st-rng.o diff --git a/drivers/char/hw_random/hisi-trng-v2.c b/drivers/char/hw_random/hisi-trng-v2.c new file mode 100644 index 0000000..6a65b82 --- /dev/null +++ b/drivers/char/hw_random/hisi-trng-v2.c @@ -0,0 +1,99 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) 2019 HiSilicon Limited. */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define HISI_TRNG_REG 0x00F0 +#define HISI_TRNG_BYTES 4 +#define HISI_TRNG_QUALITY 512 +#define SLEEP_US 10 +#define TIMEOUT_US 10000 + +struct hisi_trng { + void __iomem *base; + struct hwrng rng; +}; + +static int hisi_trng_read(struct hwrng *rng, void *buf, size_t max, bool wait) +{ + struct hisi_trng *trng; + int currsize = 0; + u32 val = 0; + u32 ret; + + trng = container_of(rng, struct hisi_trng, rng); + + do { + ret = readl_poll_timeout(trng->base + HISI_TRNG_REG, val, + val, SLEEP_US, TIMEOUT_US); + if (ret) + return currsize; + + if (max - currsize >= HISI_TRNG_BYTES) { + memcpy(buf + currsize, &val, HISI_TRNG_BYTES); + currsize += HISI_TRNG_BYTES; + if (currsize == max) + return currsize; + continue; + } + + /* copy remaining bytes */ + memcpy(buf + currsize, &val, max - currsize); + currsize = max; + } while (currsize < max); + + return currsize; +} + +static int hisi_trng_probe(struct platform_device *pdev) +{ + struct hisi_trng *trng; + int ret; + + trng = devm_kzalloc(&pdev->dev, sizeof(*trng), GFP_KERNEL); + if (!trng) + return -ENOMEM; + + trng->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(trng->base)) + return PTR_ERR(trng->base); + + trng->rng.name = pdev->name; + trng->rng.read = hisi_trng_read; + trng->rng.quality = HISI_TRNG_QUALITY; + + ret = devm_hwrng_register(&pdev->dev, &trng->rng); + if (ret) + dev_err(&pdev->dev, "failed to register hwrng!\n"); + + return ret; +} + +static const struct acpi_device_id hisi_trng_acpi_match[] = { + { "HISI02B3", 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, hisi_trng_acpi_match); + +static struct platform_driver hisi_trng_driver = { + .probe = hisi_trng_probe, + .driver = { + .name = "hisi-trng-v2", + .acpi_match_table = ACPI_PTR(hisi_trng_acpi_match), + }, +}; + +module_platform_driver(hisi_trng_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Weili Qian "); +MODULE_AUTHOR("Zaibo Xu "); +MODULE_DESCRIPTION("HiSilicon true random number generator V2 driver");