/* $OpenBSD: rkrng.c,v 1.6 2024/02/17 13:29:25 kettenis Exp $ */ /* * Copyright (c) 2020 Mark Kettenis * * Permission to use, copy, modify, and distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include #include #include #include #include #include #include #include #include /* Registers */ /* V1 */ #define RNG_CTRL 0x0008 #define RNG_CTRL_START (1 << 8) #define RNG_TRNG_CTRL 0x0200 #define RNG_TRNG_CTRL_OSC_ENABLE (1 << 16) #define RNG_TRNG_CTRL_SAMPLE_PERIOD(x) (x) #define RNG_DATA0 0x0204 /* True Random Number Generator (TRNG) */ #define TRNG_RST_CTL 0x0004 #define TRNG_RST_CTL_SW_RNG_RESET (0x1U << 1) #define TRNG_CTL 0x0400 #define TRNG_CTL_RNG_START (0x1U << 0) #define TRNG_CTL_RNG_ENABLE (0x1U << 1) #define TRNG_CTL_RING_SEL_MASK (0x3U << 2) #define TRNG_CTL_RING_SEL_SLOWEST (0x0U << 2) #define TRNG_CTL_RING_SEL_SLOW (0x1U << 2) #define TRNG_CTL_RING_SEL_FAST (0x2U << 2) #define TRNG_CTL_RING_SEL_FASTEST (0x3U << 2) #define TRNG_CTL_RNG_LEN_MASK (0x3U << 4) #define TRNG_CTL_RNG_LEN_64BIT (0x0U << 4) #define TRNG_CTL_RNG_LEN_128BIT (0x1U << 4) #define TRNG_CTL_RNG_LEN_192BIT (0x2U << 4) #define TRNG_CTL_RNG_LEN_256BIT (0x3U << 4) #define TRNG_SAMPLE_CNT 0x0404 #define TRNG_DOUT_BASE 0x0410 #define HREAD4(sc, reg) \ (bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg))) #define HWRITE4(sc, reg, val) \ bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val)) struct rkrng_v; struct rkrng_softc { struct device sc_dev; const struct rkrng_v *sc_v; bus_space_tag_t sc_iot; bus_space_handle_t sc_ioh; struct timeout sc_to; int sc_started; }; struct rkrng_v { unsigned int version; void (*start)(struct rkrng_softc *sc); int (*starting)(struct rkrng_softc *sc); void (*stop)(struct rkrng_softc *sc); bus_size_t dout; }; int rkrng_match(struct device *, void *, void *); void rkrng_attach(struct device *, struct device *, void *); const struct cfattach rkrng_ca = { sizeof (struct rkrng_softc), rkrng_match, rkrng_attach }; struct cfdriver rkrng_cd = { NULL, "rkrng", DV_DULL }; void rkrng_rnd(void *); void rkrng_v1_start(struct rkrng_softc *); int rkrng_v1_starting(struct rkrng_softc *); void rkrng_v1_stop(struct rkrng_softc *); static const struct rkrng_v rkrnv_v1 = { .version = 1, .start = rkrng_v1_start, .starting = rkrng_v1_starting, .stop = rkrng_v1_stop, .dout = RNG_DATA0, }; void rkrng_v2_start(struct rkrng_softc *); int rkrng_v2_starting(struct rkrng_softc *); void rkrng_v2_stop(struct rkrng_softc *); static const struct rkrng_v rkrnv_v2 = { .version = 2, .start = rkrng_v2_start, .starting = rkrng_v2_starting, .stop = rkrng_v2_stop, .dout = TRNG_DOUT_BASE, }; int rkrng_match(struct device *parent, void *match, void *aux) { struct fdt_attach_args *faa = aux; return OF_is_compatible(faa->fa_node, "rockchip,cryptov1-rng") || OF_is_compatible(faa->fa_node, "rockchip,rk3288-crypto") || OF_is_compatible(faa->fa_node, "rockchip,rk3328-crypto") || OF_is_compatible(faa->fa_node, "rockchip,rk3399-crypto") || OF_is_compatible(faa->fa_node, "rockchip,cryptov2-rng"); } void rkrng_attach(struct device *parent, struct device *self, void *aux) { struct rkrng_softc *sc = (struct rkrng_softc *)self; struct fdt_attach_args *faa = aux; if (OF_is_compatible(faa->fa_node, "rockchip,cryptov1-rng") || OF_is_compatible(faa->fa_node, "rockchip,rk3288-crypto") || OF_is_compatible(faa->fa_node, "rockchip,rk3328-crypto") || OF_is_compatible(faa->fa_node, "rockchip,rk3399-crypto")) sc->sc_v = &rkrnv_v1; else if (OF_is_compatible(faa->fa_node, "rockchip,cryptov2-rng")) sc->sc_v = &rkrnv_v2; else { printf(": unhandled version\n"); return; } if (faa->fa_nreg < 1) { printf(": no registers\n"); return; } sc->sc_iot = faa->fa_iot; if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr, faa->fa_reg[0].size, 0, &sc->sc_ioh)) { printf(": can't map registers\n"); return; } printf(": ver %u\n", sc->sc_v->version); clock_set_assigned(faa->fa_node); clock_enable_all(faa->fa_node); timeout_set(&sc->sc_to, rkrng_rnd, sc); rkrng_rnd(sc); } void rkrng_v1_start(struct rkrng_softc *sc) { HWRITE4(sc, RNG_TRNG_CTRL, RNG_TRNG_CTRL_OSC_ENABLE | RNG_TRNG_CTRL_SAMPLE_PERIOD(100)); HWRITE4(sc, RNG_CTRL, (RNG_CTRL_START << 16) | RNG_CTRL_START); } int rkrng_v1_starting(struct rkrng_softc *sc) { return (HREAD4(sc, RNG_CTRL) & RNG_CTRL_START); } void rkrng_v1_stop(struct rkrng_softc *sc) { HWRITE4(sc, RNG_CTRL, (RNG_CTRL_START << 16) | 0); } void rkrng_v2_start(struct rkrng_softc *sc) { uint32_t ctl_m = TRNG_CTL_RNG_START | TRNG_CTL_RNG_ENABLE | TRNG_CTL_RING_SEL_MASK | TRNG_CTL_RNG_LEN_MASK; uint32_t ctl_v = TRNG_CTL_RNG_START | TRNG_CTL_RNG_ENABLE | TRNG_CTL_RING_SEL_SLOW | TRNG_CTL_RNG_LEN_256BIT; HWRITE4(sc, TRNG_SAMPLE_CNT, 100); HWRITE4(sc, TRNG_CTL, (ctl_m << 16) | ctl_v); } int rkrng_v2_starting(struct rkrng_softc *sc) { return (HREAD4(sc, TRNG_CTL) & TRNG_CTL_RNG_START); } void rkrng_v2_stop(struct rkrng_softc *sc) { uint32_t ctl_m = TRNG_CTL_RNG_START | TRNG_CTL_RNG_ENABLE; HWRITE4(sc, TRNG_CTL, (ctl_m << 16) | 0); } void rkrng_rnd(void *arg) { struct rkrng_softc *sc = arg; bus_size_t off; if (!sc->sc_started) { sc->sc_v->start(sc); sc->sc_started = 1; timeout_add_usec(&sc->sc_to, 100); return; } if (sc->sc_v->starting(sc)) { timeout_add_usec(&sc->sc_to, 100); return; } for (off = 0; off < 32; off += 4) enqueue_randomness(HREAD4(sc, sc->sc_v->dout + off)); sc->sc_v->stop(sc); sc->sc_started = 0; timeout_add_sec(&sc->sc_to, 1); }