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imx31_clock.c revision 1.1 
      1 /*	$NetBSD: imx31_clock.c,v 1.1 2010/11/13 06:51:37 bsh Exp $ */
      2 /*
      3  * Copyright (c) 2009,2010  Genetec corp.  All rights reserved.
      4  * Written by Hashimoto Kenichi for Genetec corp.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY GENETEC CORP. ``AS IS'' AND
     16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     17  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     18  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL GENETEC CORP.
     19  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     20  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     21  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     22  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     23  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     24  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     25  * POSSIBILITY OF SUCH DAMAGE.
     26  */
     27 
     28 #include <sys/param.h>
     29 #include <sys/systm.h>
     30 #include <sys/kernel.h>
     31 #include <sys/evcnt.h>
     32 #include <sys/atomic.h>
     33 #include <sys/time.h>
     34 #include <sys/timetc.h>
     35 
     36 #include <sys/types.h>
     37 #include <sys/device.h>
     38 
     39 #include <machine/intr.h>
     40 #include <machine/bus.h>
     41 
     42 #include <arm/cpu.h>
     43 #include <arm/armreg.h>
     44 #include <arm/cpufunc.h>
     45 
     46 #include <arm/imx/imx31reg.h>
     47 #include <arm/imx/imx31var.h>
     48 #include <arm/imx/imx31_ccmvar.h>
     49 #include <arm/imx/imxclockvar.h>
     50 
     51 static int imxclock_match(device_t, struct cfdata *, void *);
     52 static void imxclock_attach(device_t, device_t, void *);
     53 
     54 struct imxclock_softc *epit1_sc = NULL;
     55 struct imxclock_softc *epit2_sc = NULL;
     56 
     57 CFATTACH_DECL_NEW(imxclock, sizeof(struct imxclock_softc),
     58     imxclock_match, imxclock_attach, NULL, NULL);
     59 
     60 static int
     61 imxclock_match(device_t parent, struct cfdata *match, void *aux)
     62 {
     63 	struct aips_attach_args *aipsa = aux;
     64 
     65 	if ( (aipsa->aipsa_addr != EPIT1_BASE) &&
     66 	     (aipsa->aipsa_addr != EPIT2_BASE) ) {
     67 		return 0;
     68 	}
     69 
     70 	return 2;
     71 }
     72 
     73 static void
     74 imxclock_attach(device_t parent, device_t self, void *aux)
     75 {
     76 	struct imxclock_softc *sc = device_private(self);
     77 	struct aips_attach_args *aipsa = aux;
     78 
     79 	aprint_normal("\n");
     80 
     81 	sc->sc_dev = self;
     82 	sc->sc_iot = aipsa->aipsa_memt;
     83 	sc->sc_intr = aipsa->aipsa_intr;
     84 
     85 	KASSERT((sc->sc_intr == IRQ_EPIT1) || (sc->sc_intr == IRQ_EPIT2));
     86 
     87 	switch ( aipsa->aipsa_addr ) {
     88 	case EPIT1_BASE:
     89 		epit1_sc = sc;
     90 		break;
     91 	case EPIT2_BASE:
     92 		epit2_sc = sc;
     93 		break;
     94 	default:
     95 		panic("%s: invalid address %p", self->dv_xname, (void *)aipsa->aipsa_addr);
     96 		break;
     97 	}
     98 
     99 	if (bus_space_map(aipsa->aipsa_memt, aipsa->aipsa_addr,
    100 		aipsa->aipsa_size, 0, &sc->sc_ioh)) {
    101 		panic("%s: Cannot map registers", device_xname(self));
    102 	}
    103 }
    104 
    105 int
    106 imxclock_get_timerfreq(struct imxclock_softc *sc)
    107 {
    108 	struct imx31_clocks clk;
    109 	imx31_get_clocks(&clk);
    110 
    111 	return clk.ipg_clk;
    112 }
    113 
    114 
    115