sys/arch/evbarm/ifpga/pl030_rtc.c

   1 /*      $NetBSD: pl030_rtc.c,v 1.9 2009/07/21 16:04:16 dyoung Exp $ */
   2
   3 /*
   4  * Copyright (c) 2001 ARM Ltd
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. The name of the company may not be used to endorse or promote
  16  *    products derived from this software without specific prior written
  17  *    permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
  20  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  22  * IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
  23  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  24  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  25  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /* Include header files */
  33
  34 #include <sys/cdefs.h>
  35 __KERNEL_RCSID(0, "$NetBSD: pl030_rtc.c,v 1.9 2009/07/21 16:04:16 dyoung Exp $");
  36
  37 #include <sys/types.h>
  38 #include <sys/param.h>
  39 #include <sys/systm.h>
  40 #include <sys/kernel.h>
  41 #include <sys/time.h>
  42 #include <sys/device.h>
  43
  44 #include <dev/clock_subr.h>
  45
  46 #include <arm/cpufunc.h>
  47 #include <machine/intr.h>
  48 #include <evbarm/ifpga/ifpgavar.h>
  49 #include <evbarm/ifpga/ifpgamem.h>
  50 #include <evbarm/ifpga/ifpgareg.h>
  51
  52 #define PL030_RTC_SIZE  0x14
  53
  54 struct plrtc_softc {
  55         bus_space_tag_t             sc_iot;
  56         bus_space_handle_t          sc_ioh;
  57         struct todr_chip_handle     sc_todr;
  58 };
  59
  60 static int  plrtc_probe  (device_t, cfdata_t, void *);
  61 static void plrtc_attach (device_t, device_t, void *);
  62
  63 CFATTACH_DECL_NEW(plrtc, sizeof(struct plrtc_softc),
  64     plrtc_probe, plrtc_attach, NULL, NULL);
  65
  66 static int
  67 plrtc_gettime(todr_chip_handle_t todr, struct timeval *tv)
  68 {
  69         struct plrtc_softc *sc;
  70
  71         sc = (struct plrtc_softc *)todr->cookie;
  72         tv->tv_sec = bus_space_read_4(sc->sc_iot, sc->sc_ioh, IFPGA_RTC_DR);
  73         /* initialize tv_usec? */
  74         return 0;
  75 }
  76
  77 static int
  78 plrtc_settime(todr_chip_handle_t todr, struct timeval *tv)
  79 {
  80         struct plrtc_softc *sc;
  81
  82         sc = (struct plrtc_softc *)todr->cookie;
  83         bus_space_write_4(sc->sc_iot, sc->sc_ioh, IFPGA_RTC_LR, tv->tv_sec);
  84         return 0;
  85 }
  86
  87 static int
  88 plrtc_probe(device_t parent, cfdata_t cf, void *aux)
  89 {
  90         return 1;
  91 }
  92
  93 static void
  94 plrtc_attach(device_t parent, device_t self, void *aux)
  95 {
  96         struct ifpga_attach_args *ifa = aux;
  97         struct plrtc_softc *sc = device_private(self);
  98
  99         sc->sc_iot = ifa->ifa_iot;
 100         if (bus_space_map(ifa->ifa_iot, ifa->ifa_addr, PL030_RTC_SIZE, 0,
 101             &sc->sc_ioh)) {
 102                 printf("%s: unable to map device\n", device_xname(self));
 103                 return;
 104         }
 105
 106         memset(&sc->sc_todr, 0, sizeof(struct todr_chip_handle));
 107         sc->sc_todr.cookie = sc;
 108         sc->sc_todr.todr_gettime = plrtc_gettime;
 109         sc->sc_todr.todr_settime = plrtc_settime;
 110
 111         todr_attach( &sc->sc_todr );
 112
 113         printf("\n");
 114 }