diff options
| -rw-r--r-- | drivers/hw_random/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/hw_random/Makefile | 1 | ||||
| -rw-r--r-- | drivers/hw_random/starfive-vic-rng.c | 208 |
3 files changed, 216 insertions, 0 deletions
diff --git a/drivers/hw_random/Kconfig b/drivers/hw_random/Kconfig index a84c03efef..764911f4d3 100644 --- a/drivers/hw_random/Kconfig +++ b/drivers/hw_random/Kconfig @@ -36,4 +36,11 @@ config HW_RANDOM_VIRTIO This driver provides guest-side support for the virtual Random Number Generator hardware. +config HW_RANDOM_STARFIVE + tristate "StarFive Random Number Generator" + depends on SOC_STARFIVE || COMPILE_TEST + help + This driver provides barebox support for the Random Number + Generator hardware found on the StarFive family of SoCs. + endif diff --git a/drivers/hw_random/Makefile b/drivers/hw_random/Makefile index 4bab3967fc..4cf33d2d93 100644 --- a/drivers/hw_random/Makefile +++ b/drivers/hw_random/Makefile @@ -3,3 +3,4 @@ obj-$(CONFIG_HWRNG_MXC_RNGC) += mxc-rngc.o obj-$(CONFIG_HWRNG_STM32) += stm32-rng.o obj-$(CONFIG_HWRNG_DEV_RANDOM) += dev-random.o obj-$(CONFIG_HW_RANDOM_VIRTIO) += virtio-rng.o +obj-$(CONFIG_HW_RANDOM_STARFIVE) += starfive-vic-rng.o diff --git a/drivers/hw_random/starfive-vic-rng.c b/drivers/hw_random/starfive-vic-rng.c new file mode 100644 index 0000000000..f7b7585884 --- /dev/null +++ b/drivers/hw_random/starfive-vic-rng.c @@ -0,0 +1,208 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * COPYRIGHT 2020 Shanghai StarFive Technology Co., Ltd. + */ +#include <common.h> +#include <linux/err.h> +#include <io.h> +#include <of.h> +#include <driver.h> +#include <linux/hw_random.h> +#include <linux/reset.h> +#include <linux/clk.h> + +#define VIC_RAND_LEN 4 + +#define VIC_CTRL 0x00 +#define VIC_MODE 0x04 +#define VIC_SMODE 0x08 +#define VIC_STAT 0x0C +#define VIC_IE 0x10 +#define VIC_ISTAT 0x14 +#define VIC_ALARM 0x18 +#define VIC_BUILD_ID 0x1C +#define VIC_FEATURES 0x20 +#define VIC_RAND0 0x24 +#define VIC_NPA_DATA0 0x34 +#define VIC_SEED0 0x74 +#define VIC_IA_RDATA 0xA4 +#define VIC_IA_WDATA 0xA8 +#define VIC_IA_ADDR 0xAC +#define VIC_IA_CMD 0xB0 + +/* CTRL */ +#define VIC_CTRL_CMD_NOP 0 +#define VIC_CTRL_CMD_GEN_NOISE 1 +#define VIC_CTRL_CMD_GEN_NONCE 2 +#define VIC_CTRL_CMD_CREATE_STATE 3 +#define VIC_CTRL_CMD_RENEW_STATE 4 +#define VIC_CTRL_CMD_REFRESH_ADDIN 5 +#define VIC_CTRL_CMD_GEN_RANDOM 6 +#define VIC_CTRL_CMD_ADVANCE_STATE 7 +#define VIC_CTRL_CMD_KAT 8 +#define VIC_CTRL_CMD_ZEROIZE 15 + +/* SMODE */ +#define _VIC_SMODE_SECURE_EN 1 + +#define VIC_SMODE_SECURE_EN(x) ((x) << _VIC_SMODE_SECURE_EN) + +/* STAT */ +#define _VIC_STAT_BUSY 31 + +#define VIC_STAT_BUSY (1UL << _VIC_STAT_BUSY) + +/* IE */ +#define _VIC_IE_GLBL 31 +#define _VIC_IE_DONE 4 +#define _VIC_IE_ALARMS 3 +#define _VIC_IE_NOISE_RDY 2 +#define _VIC_IE_KAT_COMPLETE 1 +#define _VIC_IE_ZEROIZE 0 + +#define VIC_IE_GLBL (1UL << _VIC_IE_GLBL) +#define VIC_IE_DONE (1UL << _VIC_IE_DONE) +#define VIC_IE_ALARMS (1UL << _VIC_IE_ALARMS) +#define VIC_IE_NOISE_RDY (1UL << _VIC_IE_NOISE_RDY) +#define VIC_IE_KAT_COMPLETE (1UL << _VIC_IE_KAT_COMPLETE) +#define VIC_IE_ZEROIZE (1UL << _VIC_IE_ZEROIZE) +#define VIC_IE_ALL (VIC_IE_GLBL | VIC_IE_DONE | VIC_IE_ALARMS | \ + VIC_IE_NOISE_RDY | VIC_IE_KAT_COMPLETE | VIC_IE_ZEROIZE) + +#define to_vic_rng(p) container_of(p, struct vic_rng, rng) + +struct vic_rng { + struct device_d *dev; + void __iomem *base; + struct hwrng rng; +}; + +static inline void vic_wait_till_idle(struct vic_rng *hrng) +{ + while(readl(hrng->base + VIC_STAT) & VIC_STAT_BUSY) + ; +} + +static inline void vic_rng_irq_mask_clear(struct vic_rng *hrng) +{ + u32 data = readl(hrng->base + VIC_ISTAT); + writel(data, hrng->base + VIC_ISTAT); + writel(0, hrng->base + VIC_ALARM); +} + +static int vic_trng_cmd(struct vic_rng *hrng, u32 cmd) +{ + vic_wait_till_idle(hrng); + + switch (cmd) { + case VIC_CTRL_CMD_NOP: + case VIC_CTRL_CMD_GEN_NOISE: + case VIC_CTRL_CMD_GEN_NONCE: + case VIC_CTRL_CMD_CREATE_STATE: + case VIC_CTRL_CMD_RENEW_STATE: + case VIC_CTRL_CMD_REFRESH_ADDIN: + case VIC_CTRL_CMD_GEN_RANDOM: + case VIC_CTRL_CMD_ADVANCE_STATE: + case VIC_CTRL_CMD_KAT: + case VIC_CTRL_CMD_ZEROIZE: + writel(cmd, hrng->base + VIC_CTRL); + return 0; + default: + return -EINVAL; + } +} + +static int vic_rng_init(struct hwrng *rng) +{ + struct vic_rng *hrng = to_vic_rng(rng); + struct clk *clk; + int ret; + + clk = clk_get(rng->dev, NULL); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + clk_enable(clk); + + ret = device_reset(rng->dev); + if (ret) + return ret; + + // clear register: ISTAT + vic_rng_irq_mask_clear(hrng); + + // set mission mode + writel(VIC_SMODE_SECURE_EN(1), hrng->base + VIC_SMODE); + + vic_trng_cmd(hrng, VIC_CTRL_CMD_GEN_NOISE); + vic_wait_till_idle(hrng); + + // set interrupt + writel(VIC_IE_ALL, hrng->base + VIC_IE); + + // zeroize + vic_trng_cmd(hrng, VIC_CTRL_CMD_ZEROIZE); + + vic_wait_till_idle(hrng); + + return 0; +} + +static int vic_rng_read(struct hwrng *rng, void *buf, size_t max, bool wait) +{ + struct vic_rng *hrng = to_vic_rng(rng); + + vic_trng_cmd(hrng, VIC_CTRL_CMD_ZEROIZE); + vic_trng_cmd(hrng, VIC_CTRL_CMD_GEN_NOISE); + vic_trng_cmd(hrng, VIC_CTRL_CMD_CREATE_STATE); + + vic_wait_till_idle(hrng); + max = min_t(size_t, max, VIC_RAND_LEN * 4); + + writel(0x0, hrng->base + VIC_MODE); + vic_trng_cmd(hrng, VIC_CTRL_CMD_GEN_RANDOM); + + vic_wait_till_idle(hrng); + memcpy_fromio(buf, hrng->base + VIC_RAND0, max); + vic_trng_cmd(hrng, VIC_CTRL_CMD_ZEROIZE); + + vic_wait_till_idle(hrng); + return max; +} + +static int vic_rng_probe(struct device_d *dev) +{ + struct vic_rng *hrng; + struct resource *res; + + hrng = xzalloc(sizeof(*hrng)); + + res = dev_request_mem_resource(dev, 0); + if (IS_ERR(res)) + return PTR_ERR(res); + + hrng->base = IOMEM(res->start); + hrng->dev = dev; + + hrng->rng.name = dev_name(dev); + hrng->rng.init = vic_rng_init; + hrng->rng.read = vic_rng_read; + + return hwrng_register(dev, &hrng->rng); +} + +static const struct of_device_id vic_rng_dt_ids[] = { + { .compatible = "starfive,vic-rng" }, + { /* sentinel */ } +}; + +static struct driver_d vic_rng_driver = { + .name = "vic-rng", + .probe = vic_rng_probe, + .of_compatible = vic_rng_dt_ids, +}; +device_platform_driver(vic_rng_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Huan Feng <huan.feng@starfivetech.com>"); +MODULE_DESCRIPTION("Starfive VIC random number generator driver"); |