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rng: rockchip: Add support for rkrng variant

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Add support for rkrng variant, used by e.g. RK3528 and RK3576.

Imported from vendor U-Boot linux-6.1-stan-rkr5 tag with minor
adjustments for mainline.

Signed-off-by: Lin Jinhan <troy.lin@rock-chips.com>
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
This commit is contained in:
Lin Jinhan 2025-04-07 22:46:58 +00:00 committed by Kever Yang
parent 6ef723af18
commit 7fe0b79211
1 changed files with 73 additions and 0 deletions
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73
drivers/rng/rockchip_rng.c
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@ -70,6 +70,27 @@
#define TRNG_v1_VERSION_CODE 0x46BC
/* end of TRNG V1 register define */
/* start of RKRNG register define */
#define RKRNG_CTRL 0x0010
#define RKRNG_CTRL_INST_REQ BIT(0)
#define RKRNG_CTRL_RESEED_REQ BIT(1)
#define RKRNG_CTRL_TEST_REQ BIT(2)
#define RKRNG_CTRL_SW_DRNG_REQ BIT(3)
#define RKRNG_CTRL_SW_TRNG_REQ BIT(4)
#define RKRNG_STATE 0x0014
#define RKRNG_STATE_INST_ACK BIT(0)
#define RKRNG_STATE_RESEED_ACK BIT(1)
#define RKRNG_STATE_TEST_ACK BIT(2)
#define RKRNG_STATE_SW_DRNG_ACK BIT(3)
#define RKRNG_STATE_SW_TRNG_ACK BIT(4)
/* DRNG_DATA_0 ~ DNG_DATA_7 */
#define RKRNG_DRNG_DATA_0 0x0070
#define RKRNG_DRNG_DATA_7 0x008C
/* end of RKRNG register define */
#define RK_RNG_TIME_OUT 50000 /* max 50ms */
#define trng_write(pdata, pos, val) writel(val, (pdata)->base + (pos))
@ -228,6 +249,49 @@ exit:
return retval;
}
static int rkrng_init(struct udevice *dev)
{
struct rk_rng_plat *pdata = dev_get_priv(dev);
u32 reg = 0;
rk_clrreg(pdata->base + RKRNG_CTRL, 0xffff);
reg = trng_read(pdata, RKRNG_STATE);
trng_write(pdata, RKRNG_STATE, reg);
return 0;
}
static int rkrng_rng_read(struct udevice *dev, void *data, size_t len)
{
struct rk_rng_plat *pdata = dev_get_priv(dev);
u32 reg = 0;
int retval;
if (len > RK_HW_RNG_MAX)
return -EINVAL;
reg = RKRNG_CTRL_SW_DRNG_REQ;
rk_clrsetreg(pdata->base + RKRNG_CTRL, 0xffff, reg);
retval = readl_poll_timeout(pdata->base + RKRNG_STATE, reg,
(reg & RKRNG_STATE_SW_DRNG_ACK),
RK_RNG_TIME_OUT);
if (retval)
goto exit;
trng_write(pdata, RKRNG_STATE, reg);
rk_rng_read_regs(pdata->base + RKRNG_DRNG_DATA_0, data, len);
exit:
/* close TRNG */
rk_clrreg(pdata->base + RKRNG_CTRL, 0xffff);
return retval;
}
static int rockchip_rng_read(struct udevice *dev, void *data, size_t len)
{
unsigned char *buf = data;
@ -295,6 +359,11 @@ static const struct rk_rng_soc_data rk_trngv1_soc_data = {
.rk_rng_read = rk_trngv1_rng_read,
};
static const struct rk_rng_soc_data rkrng_soc_data = {
.rk_rng_init = rkrng_init,
.rk_rng_read = rkrng_rng_read,
};
static const struct dm_rng_ops rockchip_rng_ops = {
.read = rockchip_rng_read,
};
@ -324,6 +393,10 @@ static const struct udevice_id rockchip_rng_match[] = {
.compatible = "rockchip,rk3588-rng",
.data = (ulong)&rk_trngv1_soc_data,
},
{
.compatible = "rockchip,rkrng",
.data = (ulong)&rkrng_soc_data,
},
{},
};