From: Lin Jinhan troy.lin@rock-chips.com
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 --- drivers/rng/rockchip_rng.c | 73 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 73 insertions(+)
diff --git a/drivers/rng/rockchip_rng.c b/drivers/rng/rockchip_rng.c index 2426648fbd57..0e3b95b5540e 100644 --- a/drivers/rng/rockchip_rng.c +++ b/drivers/rng/rockchip_rng.c @@ -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, }; @@ -320,6 +389,10 @@ static const struct udevice_id rockchip_rng_match[] = { .compatible = "rockchip,trngv1", .data = (ulong)&rk_trngv1_soc_data, }, + { + .compatible = "rockchip,rkrng", + .data = (ulong)&rkrng_soc_data, + }, {}, };