IABSD.fr/src/sys/dev/ic/ccp.c

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• Author : jsg
  Date : 2024-09-04 07:45:08
  Hash : 8eadc5ec
  Message : make psp attach to ccp as a different driver 'fine with me' hshoexer, ok bluhm@

• sys/dev/ic/ccp.c

• /*	$OpenBSD: ccp.c,v 1.11 2024/09/04 07:45:08 jsg Exp $ */
  
  /*
   * Copyright (c) 2018 David Gwynne <dlg@openbsd.org>
   *
   * 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 <sys/param.h>
  #include <sys/systm.h>
  #include <sys/device.h>
  #include <sys/timeout.h>
  
  #include <machine/bus.h>
  
  #include <dev/ic/ccpvar.h>
  
  #define CCP_REG_TRNG		0xc
  
  static void	ccp_rng(void *);
  
  struct cfdriver ccp_cd = {
  	NULL,
  	"ccp",
  	DV_DULL
  };
  
  void
  ccp_attach(struct ccp_softc *sc)
  {
  	timeout_set(&sc->sc_tick, ccp_rng, sc);
  	ccp_rng(sc);
  
  	printf("\n");
  }
  
  static void
  ccp_rng(void *arg)
  {
  	struct ccp_softc *sc = arg;
  	uint32_t trng;
  
  	trng = bus_space_read_4(sc->sc_iot, sc->sc_ioh, CCP_REG_TRNG);
  	if (trng != 0)
  		enqueue_randomness(trng);
  
  	timeout_add_msec(&sc->sc_tick, 100);
  }