From patchwork Tue Mar 31 09:39:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lin Jinhan X-Patchwork-Id: 1264693 X-Patchwork-Delegate: ykai007@gmail.com Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=lists.denx.de (client-ip=85.214.62.61; helo=phobos.denx.de; envelope-from=u-boot-bounces@lists.denx.de; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=rock-chips.com Received: from phobos.denx.de (phobos.denx.de [85.214.62.61]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 48s6j253gKz9sR4 for ; Tue, 31 Mar 2020 22:36:06 +1100 (AEDT) Received: from h2850616.stratoserver.net (localhost [IPv6:::1]) by phobos.denx.de (Postfix) with ESMTP id 380C9819EA; Tue, 31 Mar 2020 13:35:38 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=none (p=none dis=none) header.from=rock-chips.com Authentication-Results: phobos.denx.de; spf=pass smtp.mailfrom=u-boot-bounces@lists.denx.de Received: by phobos.denx.de (Postfix, from userid 109) id 88872819A9; Tue, 31 Mar 2020 11:40:15 +0200 (CEST) X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on phobos.denx.de X-Spam-Level: X-Spam-Status: No, score=-0.4 required=5.0 tests=BAYES_00, RCVD_IN_SORBS_WEB, SPF_HELO_NONE,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.2 Received: from lucky1.263xmail.com (lucky1.263xmail.com [211.157.147.130]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by phobos.denx.de (Postfix) with ESMTPS id 449FA819A6 for ; Tue, 31 Mar 2020 11:40:09 +0200 (CEST) Authentication-Results: phobos.denx.de; dmarc=none (p=none dis=none) header.from=rock-chips.com Authentication-Results: phobos.denx.de; spf=fail smtp.mailfrom=troy.lin@rock-chips.com Received: from localhost (unknown [192.168.167.235]) by lucky1.263xmail.com (Postfix) with ESMTP id B1262A3EF8; Tue, 31 Mar 2020 17:40:04 +0800 (CST) X-MAIL-GRAY: 0 X-MAIL-DELIVERY: 1 X-ADDR-CHECKED: 0 X-ANTISPAM-LEVEL: 2 X-ABS-CHECKED: 0 Received: from localhost.localdomain (unknown [58.22.7.114]) by smtp.263.net (postfix) whith ESMTP id P29487T139780956792576S1585647603180703_; Tue, 31 Mar 2020 17:40:04 +0800 (CST) X-IP-DOMAINF: 1 X-UNIQUE-TAG: <78d4a197cac8da659f7b02fbce5e0ad8> X-RL-SENDER: troy.lin@rock-chips.com X-SENDER: troy.lin@rock-chips.com X-LOGIN-NAME: troy.lin@rock-chips.com X-FST-TO: u-boot@lists.denx.de X-SENDER-IP: 58.22.7.114 X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 X-System-Flag: 0 From: Lin Jinhan To: u-boot@lists.denx.de, sughosh.ganu@linaro.org, xypron.glpk@gmx.de Cc: kever.yang@rock-chips.com, zhangzj@rock-chips.com, Lin Jinhan Subject: [PATCH 3/5] rockchip: rng: Add a driver for random number generator(rng) device Date: Tue, 31 Mar 2020 17:39:59 +0800 Message-Id: <20200331094001.13441-3-troy.lin@rock-chips.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200331094001.13441-1-troy.lin@rock-chips.com> References: <20200331094001.13441-1-troy.lin@rock-chips.com> X-Mailman-Approved-At: Tue, 31 Mar 2020 13:35:19 +0200 X-BeenThere: u-boot@lists.denx.de X-Mailman-Version: 2.1.30rc1 Precedence: list List-Id: U-Boot discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: u-boot-bounces@lists.denx.de Sender: "U-Boot" X-Virus-Scanned: clamav-milter 0.102.2 at phobos.denx.de X-Virus-Status: Clean Add a driver for the rng device found on rockchip platforms. Support rng module of crypto v1 and crypto v2. Signed-off-by: Lin Jinhan Tested-by: Peter Robinson Reviewed-by: Kever Yang --- drivers/rng/Kconfig | 8 ++ drivers/rng/Makefile | 1 + drivers/rng/rockchip_rng.c | 224 +++++++++++++++++++++++++++++++++++++ 3 files changed, 233 insertions(+) create mode 100644 drivers/rng/rockchip_rng.c diff --git a/drivers/rng/Kconfig b/drivers/rng/Kconfig index edb6152bb9..e4b22d79eb 100644 --- a/drivers/rng/Kconfig +++ b/drivers/rng/Kconfig @@ -31,4 +31,12 @@ config RNG_STM32MP1 help Enable STM32MP1 rng driver. +config RNG_ROCKCHIP + bool "Enable random number generator for rockchip crypto rng" + depends on ARCH_ROCKCHIP && DM_RNG + default n + help + Enable random number generator for rockchip.This driver is + support rng module of crypto v1 and crypto v2. + endif diff --git a/drivers/rng/Makefile b/drivers/rng/Makefile index 6a8a66779b..44a0003917 100644 --- a/drivers/rng/Makefile +++ b/drivers/rng/Makefile @@ -7,3 +7,4 @@ obj-$(CONFIG_DM_RNG) += rng-uclass.o obj-$(CONFIG_RNG_MESON) += meson-rng.o obj-$(CONFIG_RNG_SANDBOX) += sandbox_rng.o obj-$(CONFIG_RNG_STM32MP1) += stm32mp1_rng.o +obj-$(CONFIG_RNG_ROCKCHIP) += rockchip_rng.o diff --git a/drivers/rng/rockchip_rng.c b/drivers/rng/rockchip_rng.c new file mode 100644 index 0000000000..47fb140077 --- /dev/null +++ b/drivers/rng/rockchip_rng.c @@ -0,0 +1,224 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2020 Fuzhou Rockchip Electronics Co., Ltd + */ +#include +#include +#include +#include +#include +#include +#include + +#define RK_HW_RNG_MAX 32 + +#define _SBF(s, v) ((v) << (s)) + +/* start of CRYPTO V1 register define */ +#define CRYPTO_V1_CTRL 0x0008 +#define CRYPTO_V1_RNG_START BIT(8) +#define CRYPTO_V1_RNG_FLUSH BIT(9) + +#define CRYPTO_V1_TRNG_CTRL 0x0200 +#define CRYPTO_V1_OSC_ENABLE BIT(16) +#define CRYPTO_V1_TRNG_SAMPLE_PERIOD(x) (x) + +#define CRYPTO_V1_TRNG_DOUT_0 0x0204 +/* end of CRYPTO V1 register define */ + +/* start of CRYPTO V2 register define */ +#define CRYPTO_V2_RNG_CTL 0x0400 +#define CRYPTO_V2_RNG_64_BIT_LEN _SBF(4, 0x00) +#define CRYPTO_V2_RNG_128_BIT_LEN _SBF(4, 0x01) +#define CRYPTO_V2_RNG_192_BIT_LEN _SBF(4, 0x02) +#define CRYPTO_V2_RNG_256_BIT_LEN _SBF(4, 0x03) +#define CRYPTO_V2_RNG_FATESY_SOC_RING _SBF(2, 0x00) +#define CRYPTO_V2_RNG_SLOWER_SOC_RING_0 _SBF(2, 0x01) +#define CRYPTO_V2_RNG_SLOWER_SOC_RING_1 _SBF(2, 0x02) +#define CRYPTO_V2_RNG_SLOWEST_SOC_RING _SBF(2, 0x03) +#define CRYPTO_V2_RNG_ENABLE BIT(1) +#define CRYPTO_V2_RNG_START BIT(0) +#define CRYPTO_V2_RNG_SAMPLE_CNT 0x0404 +#define CRYPTO_V2_RNG_DOUT_0 0x0410 +/* end of CRYPTO V2 register define */ + +#define RK_RNG_TIME_OUT 50000 /* max 50ms */ + +struct rk_rng_soc_data { + int (*rk_rng_read)(struct udevice *dev, void *data, size_t len); +}; + +struct rk_rng_platdata { + fdt_addr_t base; + struct rk_rng_soc_data *soc_data; +}; + +static int rk_rng_read_regs(fdt_addr_t addr, void *buf, size_t size) +{ + u32 count = RK_HW_RNG_MAX / sizeof(u32); + u32 reg, tmp_len; + + if (size > RK_HW_RNG_MAX) + return -EINVAL; + + while (size && count) { + reg = readl(addr); + tmp_len = min(size, sizeof(u32)); + memcpy(buf, ®, tmp_len); + addr += sizeof(u32); + buf += tmp_len; + size -= tmp_len; + count--; + } + + return 0; +} + +static int rk_v1_rng_read(struct udevice *dev, void *data, size_t len) +{ + struct rk_rng_platdata *pdata = dev_get_priv(dev); + u32 reg = 0; + int retval; + + if (len > RK_HW_RNG_MAX) + return -EINVAL; + + /* enable osc_ring to get entropy, sample period is set as 100 */ + writel(CRYPTO_V1_OSC_ENABLE | CRYPTO_V1_TRNG_SAMPLE_PERIOD(100), + pdata->base + CRYPTO_V1_TRNG_CTRL); + + rk_clrsetreg(pdata->base + CRYPTO_V1_CTRL, CRYPTO_V1_RNG_START, + CRYPTO_V1_RNG_START); + + retval = readl_poll_timeout(pdata->base + CRYPTO_V1_CTRL, reg, + !(reg & CRYPTO_V1_RNG_START), + RK_RNG_TIME_OUT); + if (retval) + goto exit; + + rk_rng_read_regs(pdata->base + CRYPTO_V1_TRNG_DOUT_0, data, len); + +exit: + /* close TRNG */ + rk_clrreg(pdata->base + CRYPTO_V1_CTRL, CRYPTO_V1_RNG_START); + + return 0; +} + +static int rk_v2_rng_read(struct udevice *dev, void *data, size_t len) +{ + struct rk_rng_platdata *pdata = dev_get_priv(dev); + u32 reg = 0; + int retval; + + if (len > RK_HW_RNG_MAX) + return -EINVAL; + + /* enable osc_ring to get entropy, sample period is set as 100 */ + writel(100, pdata->base + CRYPTO_V2_RNG_SAMPLE_CNT); + + reg |= CRYPTO_V2_RNG_256_BIT_LEN; + reg |= CRYPTO_V2_RNG_SLOWER_SOC_RING_0; + reg |= CRYPTO_V2_RNG_ENABLE; + reg |= CRYPTO_V2_RNG_START; + + rk_clrsetreg(pdata->base + CRYPTO_V2_RNG_CTL, 0xffff, reg); + + retval = readl_poll_timeout(pdata->base + CRYPTO_V2_RNG_CTL, reg, + !(reg & CRYPTO_V2_RNG_START), + RK_RNG_TIME_OUT); + if (retval) + goto exit; + + rk_rng_read_regs(pdata->base + CRYPTO_V2_RNG_DOUT_0, data, len); + +exit: + /* close TRNG */ + rk_clrreg(pdata->base + CRYPTO_V2_RNG_CTL, 0xffff); + + return retval; +} + +static int rockchip_rng_read(struct udevice *dev, void *data, size_t len) +{ + unsigned char *buf = data; + unsigned int i; + int ret = -EIO; + + struct rk_rng_platdata *pdata = dev_get_priv(dev); + + if (!len) + return 0; + + if (!pdata->soc_data || !pdata->soc_data->rk_rng_read) + return -EINVAL; + + for (i = 0; i < len / RK_HW_RNG_MAX; i++, buf += RK_HW_RNG_MAX) { + ret = pdata->soc_data->rk_rng_read(dev, buf, RK_HW_RNG_MAX); + if (ret) + goto exit; + } + + if (len % RK_HW_RNG_MAX) + ret = pdata->soc_data->rk_rng_read(dev, buf, + len % RK_HW_RNG_MAX); + +exit: + return ret; +} + +static int rockchip_rng_ofdata_to_platdata(struct udevice *dev) +{ + struct rk_rng_platdata *pdata = dev_get_priv(dev); + + memset(pdata, 0x00, sizeof(*pdata)); + + pdata->base = (fdt_addr_t)dev_read_addr_ptr(dev); + if (!pdata->base) + return -ENOMEM; + + return 0; +} + +static int rockchip_rng_probe(struct udevice *dev) +{ + struct rk_rng_platdata *pdata = dev_get_priv(dev); + + pdata->soc_data = (struct rk_rng_soc_data *)dev_get_driver_data(dev); + + return 0; +} + +static const struct rk_rng_soc_data rk_rng_v1_soc_data = { + .rk_rng_read = rk_v1_rng_read, +}; + +static const struct rk_rng_soc_data rk_rng_v2_soc_data = { + .rk_rng_read = rk_v2_rng_read, +}; + +static const struct dm_rng_ops rockchip_rng_ops = { + .read = rockchip_rng_read, +}; + +static const struct udevice_id rockchip_rng_match[] = { + { + .compatible = "rockchip,cryptov1-rng", + .data = (ulong)&rk_rng_v1_soc_data, + }, + { + .compatible = "rockchip,cryptov2-rng", + .data = (ulong)&rk_rng_v2_soc_data, + }, + {}, +}; + +U_BOOT_DRIVER(rockchip_rng) = { + .name = "rockchip-rng", + .id = UCLASS_RNG, + .of_match = rockchip_rng_match, + .ops = &rockchip_rng_ops, + .probe = rockchip_rng_probe, + .ofdata_to_platdata = rockchip_rng_ofdata_to_platdata, + .priv_auto_alloc_size = sizeof(struct rk_rng_platdata), +};