127 lines
3.8 KiB
C
127 lines
3.8 KiB
C
/* $NetBSD: ingenic_rng.c,v 1.4 2016/02/17 20:12:42 macallan Exp $ */
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/*-
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* Copyright (c) 2015 Michael McConville
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ingenic_rng.c,v 1.4 2016/02/17 20:12:42 macallan Exp $");
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/*
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* adapted from Jared McNeill's amlogic_rng.c
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/device.h>
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#include <sys/mutex.h>
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#include <sys/kernel.h>
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#include <sys/mutex.h>
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#include <sys/bus.h>
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#include <sys/rndpool.h>
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#include <sys/rndsource.h>
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#include <mips/ingenic/ingenic_var.h>
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#include <mips/ingenic/ingenic_regs.h>
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#include "opt_ingenic.h"
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struct ingenic_rng_softc;
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static int ingenic_rng_match(device_t, cfdata_t, void *);
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static void ingenic_rng_attach(device_t, device_t, void *);
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static void ingenic_rng_get(size_t, void *);
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struct ingenic_rng_softc {
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device_t sc_dev;
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bus_space_tag_t sc_bst;
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bus_space_handle_t sc_bsh;
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kmutex_t sc_lock;
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krndsource_t sc_rndsource;
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};
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CFATTACH_DECL_NEW(ingenic_rng, sizeof(struct ingenic_rng_softc),
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ingenic_rng_match, ingenic_rng_attach, NULL, NULL);
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static int
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ingenic_rng_match(device_t parent, cfdata_t cf, void *aux)
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{
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const struct apbus_attach_args *aa = aux;
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return !(strcmp(aa->aa_name, "jzrng"));
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}
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static void
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ingenic_rng_attach(device_t parent, device_t self, void *aux)
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{
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struct ingenic_rng_softc * const sc = device_private(self);
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const struct apbus_attach_args * const aa = aux;
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bus_addr_t addr = aa->aa_addr;
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int error;
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sc->sc_dev = self;
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sc->sc_bst = aa->aa_bst;
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if (addr == 0)
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addr = JZ_RNG;
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error = bus_space_map(aa->aa_bst, addr, 4, 0, &sc->sc_bsh);
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if (error) {
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aprint_error_dev(self,
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"can't map registers for %s: %d\n", aa->aa_name, error);
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return;
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}
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mutex_init(&sc->sc_lock, MUTEX_DEFAULT, IPL_VM);
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aprint_naive(": Ingenic random number generator\n");
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aprint_normal(": Ingenic random number generator\n");
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rndsource_setcb(&sc->sc_rndsource, ingenic_rng_get, sc);
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rnd_attach_source(&sc->sc_rndsource, device_xname(self), RND_TYPE_RNG,
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RND_FLAG_COLLECT_VALUE|RND_FLAG_HASCB);
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ingenic_rng_get(RND_POOLBITS / NBBY, sc);
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}
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static void
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ingenic_rng_get(size_t bytes_wanted, void *priv)
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{
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struct ingenic_rng_softc * const sc = priv;
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uint32_t data;
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mutex_spin_enter(&sc->sc_lock);
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while (bytes_wanted) {
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data = bus_space_read_4(sc->sc_bst, sc->sc_bsh, 0);
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delay(1);
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rnd_add_data_sync(&sc->sc_rndsource, &data, sizeof(data),
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sizeof(data) * NBBY);
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bytes_wanted -= MIN(bytes_wanted, sizeof(data));
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}
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explicit_memset(&data, 0, sizeof(data));
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mutex_spin_exit(&sc->sc_lock);
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}
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