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// 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");
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