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Mon, 1 Jun 2020 20:28:03 +0000 From: Olivier Sobrie To: Matt Mackall , Herbert Xu , Rob Herring , Arnd Bergmann , Greg Kroah-Hartman , linux-crypto@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Olivier Sobrie , Waleed Ziad , sebastien.rabou@silexinsight.com, Rob Herring Subject: [PATCH v2 1/2] dt-bindings: rng: document Silex Insight BA431 hwrng Date: Mon, 1 Jun 2020 16:27:39 +0200 Message-Id: <20200601142740.443548-2-olivier.sobrie@silexinsight.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200601142740.443548-1-olivier.sobrie@silexinsight.com> References: <20200601142740.443548-1-olivier.sobrie@silexinsight.com> X-ClientProxiedBy: AM4PR0902CA0023.eurprd09.prod.outlook.com (2603:10a6:200:9b::33) To AM7PR09MB3621.eurprd09.prod.outlook.com (2603:10a6:20b:10d::15) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost (2a02:a03f:a7df:f300:3173:2902:9670:18b) by AM4PR0902CA0023.eurprd09.prod.outlook.com (2603:10a6:200:9b::33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3045.19 via Frontend Transport; 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This IP is for instance present in the Viper OEM boards sold by Silex Insight. Signed-off-by: Olivier Sobrie Reviewed-by: Rob Herring --- .../bindings/rng/silex-insight,ba431-rng.yaml | 36 +++++++++++++++++++ 1 file changed, 36 insertions(+) create mode 100644 Documentation/devicetree/bindings/rng/silex-insight,ba431-rng.yaml diff --git a/Documentation/devicetree/bindings/rng/silex-insight,ba431-rng.yaml b/Documentation/devicetree/bindings/rng/silex-insight,ba431-rng.yaml new file mode 100644 index 0000000000000..48ab82abf50ec --- /dev/null +++ b/Documentation/devicetree/bindings/rng/silex-insight,ba431-rng.yaml @@ -0,0 +1,36 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/rng/silex-insight,ba431-rng.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Silex Insight BA431 RNG bindings + +description: | + The BA431 hardware random number generator is an IP that is FIPS-140-2/3 + certified. + +maintainers: + - Olivier Sobrie + +properties: + compatible: + const: silex-insight,ba431-rng + + reg: + maxItems: 1 + +required: + - compatible + - reg + +additionalProperties: false + +examples: + - | + rng@42800000 { + compatible = "silex-insight,ba431-rng"; + reg = <0x42800000 0x1000>; + }; + +... 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dkim=none (message not signed) header.d=none;selenic.com; dmarc=none action=none header.from=silexinsight.com; Received: from AM7PR09MB3621.eurprd09.prod.outlook.com (2603:10a6:20b:10d::15) by AM7PR09MB3957.eurprd09.prod.outlook.com (2603:10a6:20b:11f::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3045.17; Mon, 1 Jun 2020 20:28:04 +0000 Received: from AM7PR09MB3621.eurprd09.prod.outlook.com ([fe80::e902:acdf:8750:e9e2]) by AM7PR09MB3621.eurprd09.prod.outlook.com ([fe80::e902:acdf:8750:e9e2%8]) with mapi id 15.20.3045.024; Mon, 1 Jun 2020 20:28:04 +0000 From: Olivier Sobrie To: Matt Mackall , Herbert Xu , Rob Herring , Arnd Bergmann , Greg Kroah-Hartman , linux-crypto@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Olivier Sobrie , Waleed Ziad , sebastien.rabou@silexinsight.com Subject: [PATCH v2 2/2] hwrng: ba431-rng: add support for BA431 hwrng Date: Mon, 1 Jun 2020 16:27:40 +0200 Message-Id: <20200601142740.443548-3-olivier.sobrie@silexinsight.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200601142740.443548-1-olivier.sobrie@silexinsight.com> References: <20200601142740.443548-1-olivier.sobrie@silexinsight.com> X-ClientProxiedBy: AM4PR0902CA0004.eurprd09.prod.outlook.com (2603:10a6:200:9b::14) To AM7PR09MB3621.eurprd09.prod.outlook.com (2603:10a6:20b:10d::15) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost (2a02:a03f:a7df:f300:3173:2902:9670:18b) by AM4PR0902CA0004.eurprd09.prod.outlook.com (2603:10a6:200:9b::14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3045.17 via Frontend Transport; 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This driver adds support for it through the hwrng interface. This driver is used in Silex Insight Viper OEM boards. Signed-off-by: Olivier Sobrie Signed-off-by: Waleed Ziad Acked-by: Arnd Bergmann --- drivers/char/hw_random/Kconfig | 12 ++ drivers/char/hw_random/Makefile | 1 + drivers/char/hw_random/ba431-rng.c | 234 +++++++++++++++++++++++++++++ 3 files changed, 247 insertions(+) create mode 100644 drivers/char/hw_random/ba431-rng.c diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig index 9bc46da8d77a8..4f50ee02c639e 100644 --- a/drivers/char/hw_random/Kconfig +++ b/drivers/char/hw_random/Kconfig @@ -74,6 +74,18 @@ config HW_RANDOM_ATMEL If unsure, say Y. +config HW_RANDOM_BA431 + tristate "Silex Insight BA431 Random Number Generator support" + default HW_RANDOM + help + This driver provides kernel-side support for the Random Number + Generator hardware based on Silex Insight BA431 IP. + + To compile this driver as a module, choose M here: the + module will be called ba431-rng. + + If unsure, say Y. + config HW_RANDOM_BCM2835 tristate "Broadcom BCM2835/BCM63xx Random Number Generator support" depends on ARCH_BCM2835 || ARCH_BCM_NSP || ARCH_BCM_5301X || \ diff --git a/drivers/char/hw_random/Makefile b/drivers/char/hw_random/Makefile index a7801b49ce6c0..02ccadafcca99 100644 --- a/drivers/char/hw_random/Makefile +++ b/drivers/char/hw_random/Makefile @@ -9,6 +9,7 @@ obj-$(CONFIG_HW_RANDOM_TIMERIOMEM) += timeriomem-rng.o obj-$(CONFIG_HW_RANDOM_INTEL) += intel-rng.o obj-$(CONFIG_HW_RANDOM_AMD) += amd-rng.o obj-$(CONFIG_HW_RANDOM_ATMEL) += atmel-rng.o +obj-$(CONFIG_HW_RANDOM_BA431) += ba431-rng.o obj-$(CONFIG_HW_RANDOM_GEODE) += geode-rng.o obj-$(CONFIG_HW_RANDOM_N2RNG) += n2-rng.o n2-rng-y := n2-drv.o n2-asm.o diff --git a/drivers/char/hw_random/ba431-rng.c b/drivers/char/hw_random/ba431-rng.c new file mode 100644 index 0000000000000..a39e3abf50b94 --- /dev/null +++ b/drivers/char/hw_random/ba431-rng.c @@ -0,0 +1,234 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2020 Silex Insight + +#include +#include +#include +#include +#include +#include +#include +#include + +#define BA431_RESET_DELAY 1 /* usec */ +#define BA431_RESET_READ_STATUS_TIMEOUT 1000 /* usec */ +#define BA431_RESET_READ_STATUS_INTERVAL 10 /* usec */ +#define BA431_READ_RETRY_INTERVAL 1 /* usec */ + +#define BA431_REG_CTRL 0x00 +#define BA431_REG_FIFO_LEVEL 0x04 +#define BA431_REG_STATUS 0x30 +#define BA431_REG_FIFODATA 0x80 + +#define BA431_CTRL_ENABLE BIT(0) +#define BA431_CTRL_SOFTRESET BIT(8) + +#define BA431_STATUS_STATE_MASK (BIT(1) | BIT(2) | BIT(3)) +#define BA431_STATUS_STATE_OFFSET 1 + +enum ba431_state { + BA431_STATE_RESET, + BA431_STATE_STARTUP, + BA431_STATE_FIFOFULLON, + BA431_STATE_FIFOFULLOFF, + BA431_STATE_RUNNING, + BA431_STATE_ERROR +}; + +struct ba431_trng { + struct device *dev; + void __iomem *base; + struct hwrng rng; + atomic_t reset_pending; + struct work_struct reset_work; +}; + +static inline u32 ba431_trng_read_reg(struct ba431_trng *ba431, u32 reg) +{ + return ioread32(ba431->base + reg); +} + +static inline void ba431_trng_write_reg(struct ba431_trng *ba431, u32 reg, + u32 val) +{ + iowrite32(val, ba431->base + reg); +} + +static inline enum ba431_state ba431_trng_get_state(struct ba431_trng *ba431) +{ + u32 status = ba431_trng_read_reg(ba431, BA431_REG_STATUS); + + return (status & BA431_STATUS_STATE_MASK) >> BA431_STATUS_STATE_OFFSET; +} + +static int ba431_trng_is_in_error(struct ba431_trng *ba431) +{ + enum ba431_state state = ba431_trng_get_state(ba431); + + if ((state < BA431_STATE_STARTUP) || + (state >= BA431_STATE_ERROR)) + return 1; + + return 0; +} + +static int ba431_trng_reset(struct ba431_trng *ba431) +{ + int ret; + + /* Disable interrupts, random generation and enable the softreset */ + ba431_trng_write_reg(ba431, BA431_REG_CTRL, BA431_CTRL_SOFTRESET); + udelay(BA431_RESET_DELAY); + ba431_trng_write_reg(ba431, BA431_REG_CTRL, BA431_CTRL_ENABLE); + + /* Wait until the state changed */ + if (readx_poll_timeout(ba431_trng_is_in_error, ba431, ret, !ret, + BA431_RESET_READ_STATUS_INTERVAL, + BA431_RESET_READ_STATUS_TIMEOUT)) { + dev_err(ba431->dev, "reset failed (state: %d)\n", + ba431_trng_get_state(ba431)); + return -ETIMEDOUT; + } + + dev_info(ba431->dev, "reset done\n"); + + return 0; +} + +static void ba431_trng_reset_work(struct work_struct *work) +{ + struct ba431_trng *ba431 = container_of(work, struct ba431_trng, + reset_work); + ba431_trng_reset(ba431); + atomic_set(&ba431->reset_pending, 0); +} + +static void ba431_trng_schedule_reset(struct ba431_trng *ba431) +{ + if (atomic_cmpxchg(&ba431->reset_pending, 0, 1)) + return; + + schedule_work(&ba431->reset_work); +} + +static int ba431_trng_read(struct hwrng *rng, void *buf, size_t max, bool wait) +{ + struct ba431_trng *ba431 = container_of(rng, struct ba431_trng, rng); + u32 *data = buf; + unsigned int level, i; + int n = 0; + + while (max > 0) { + level = ba431_trng_read_reg(ba431, BA431_REG_FIFO_LEVEL); + if (!level) { + if (ba431_trng_is_in_error(ba431)) { + ba431_trng_schedule_reset(ba431); + break; + } + + if (!wait) + break; + + udelay(BA431_READ_RETRY_INTERVAL); + continue; + } + + i = level; + do { + data[n++] = ba431_trng_read_reg(ba431, + BA431_REG_FIFODATA); + max -= sizeof(*data); + } while (--i && (max > 0)); + + if (ba431_trng_is_in_error(ba431)) { + n -= (level - i); + ba431_trng_schedule_reset(ba431); + break; + } + } + + n *= sizeof(data); + return (n || !wait) ? n : -EIO; +} + +static void ba431_trng_cleanup(struct hwrng *rng) +{ + struct ba431_trng *ba431 = container_of(rng, struct ba431_trng, rng); + + ba431_trng_write_reg(ba431, BA431_REG_CTRL, 0); + cancel_work_sync(&ba431->reset_work); +} + +static int ba431_trng_init(struct hwrng *rng) +{ + struct ba431_trng *ba431 = container_of(rng, struct ba431_trng, rng); + + return ba431_trng_reset(ba431); +} + +static int ba431_trng_probe(struct platform_device *pdev) +{ + struct ba431_trng *ba431; + struct resource *res; + int ret; + + ba431 = devm_kzalloc(&pdev->dev, sizeof(*ba431), GFP_KERNEL); + if (!ba431) + return -ENOMEM; + + ba431->dev = &pdev->dev; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + ba431->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(ba431->base)) + return PTR_ERR(ba431->base); + + atomic_set(&ba431->reset_pending, 0); + INIT_WORK(&ba431->reset_work, ba431_trng_reset_work); + ba431->rng.name = pdev->name; + ba431->rng.init = ba431_trng_init; + ba431->rng.cleanup = ba431_trng_cleanup; + ba431->rng.read = ba431_trng_read; + + platform_set_drvdata(pdev, ba431); + + ret = hwrng_register(&ba431->rng); + if (ret) { + dev_err(&pdev->dev, "BA431 registration failed (%d)\n", ret); + return ret; + } + + dev_info(&pdev->dev, "BA431 TRNG registered\n"); + + return 0; +} + +static int ba431_trng_remove(struct platform_device *pdev) +{ + struct ba431_trng *ba431 = platform_get_drvdata(pdev); + + hwrng_unregister(&ba431->rng); + + return 0; +} + +static const struct of_device_id ba431_trng_dt_ids[] = { + { .compatible = "silex-insight,ba431-rng", .data = NULL }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, ba431_trng_dt_ids); + +static struct platform_driver ba431_trng_driver = { + .driver = { + .name = "ba431-rng", + .of_match_table = ba431_trng_dt_ids, + }, + .probe = ba431_trng_probe, + .remove = ba431_trng_remove, +}; + +module_platform_driver(ba431_trng_driver); + +MODULE_AUTHOR("Olivier Sobrie "); +MODULE_DESCRIPTION("TRNG driver for Silex Insight BA431"); +MODULE_LICENSE("GPL");