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      1 /*	$NetBSD: ds1553rtc.c,v 1.2 2011/01/18 01:10:25 matt Exp $	*/
      2 /*-
      3  * Copyright (c) 2010, 2011 The NetBSD Foundation, Inc.
      4  * All rights reserved.
      5  *
      6  * This code is derived from software contributed to The NetBSD Foundation
      7  * by Raytheon BBN Technologies Corp and Defense Advanced Research Projects
      8  * Agency and which was developed by Matt Thomas of 3am Software Foundry.
      9  *
     10  * This material is based upon work supported by the Defense Advanced Research
     11  * Projects Agency and Space and Naval Warfare Systems Center, Pacific, under
     12  * Contract No. N66001-09-C-2073.
     13  * Approved for Public Release, Distribution Unlimited
     14  *
     15  * Redistribution and use in source and binary forms, with or without
     16  * modification, are permitted provided that the following conditions
     17  * are met:
     18  * 1. Redistributions of source code must retain the above copyright
     19  *    notice, this list of conditions and the following disclaimer.
     20  * 2. Redistributions in binary form must reproduce the above copyright
     21  *    notice, this list of conditions and the following disclaimer in the
     22  *    documentation and/or other materials provided with the distribution.
     23  *
     24  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     25  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     26  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     27  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     28  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     34  * POSSIBILITY OF SUCH DAMAGE.
     35  */
     36 
     37 #include "locators.h"
     38 
     39 #include <sys/cdefs.h>
     40 
     41 __KERNEL_RCSID(0, "$NetBSD: ds1553rtc.c,v 1.2 2011/01/18 01:10:25 matt Exp $");
     42 
     43 #include <sys/param.h>
     44 #include <sys/cpu.h>
     45 #include <sys/device.h>
     46 #include <sys/tty.h>
     47 
     48 #include "ioconf.h"
     49 
     50 #include <sys/intr.h>
     51 #include <sys/bus.h>
     52 
     53 #include <dev/clock_subr.h>
     54 #include <dev/ic/mk48txxvar.h>
     55 
     56 #include <powerpc/booke/cpuvar.h>
     57 
     58 static int ds1553rtc_match(device_t, cfdata_t, void *);
     59 static void ds1553rtc_attach(device_t, device_t, void *);
     60 
     61 CFATTACH_DECL_NEW(ds1553rtc, sizeof(struct mk48txx_softc),
     62     ds1553rtc_match, ds1553rtc_attach, NULL, NULL);
     63 
     64 static int
     65 ds1553rtc_match(device_t parent, cfdata_t cf, void *aux)
     66 {
     67 	struct generic_attach_args * const ga = aux;
     68 	bus_space_handle_t bsh;
     69 	int error;
     70 	int rv;
     71 	uint8_t saved_data, new_data;
     72 	bus_size_t size = ga->ga_size;
     73 
     74 	if (ga->ga_addr == OBIOCF_ADDR_DEFAULT)
     75 		return 0;
     76 	if (size == OBIOCF_SIZE_DEFAULT)
     77 		size = 8192;
     78 
     79 	/*
     80 	 * If this is NVRAM+RTC, make sure we can modify the NVRAM.
     81 	 */
     82 	error = bus_space_map(ga->ga_bst, ga->ga_addr, size, 0, &bsh);
     83 	if (error)
     84 		return 0;
     85 
     86 	bus_size_t target = size - 17;
     87 	saved_data = bus_space_read_1(ga->ga_bst, bsh, target);
     88 	bus_space_write_1(ga->ga_bst, bsh, target, ~saved_data);
     89 	new_data = bus_space_read_1(ga->ga_bst, bsh, target);
     90 	rv = (new_data == (uint8_t) ~saved_data);
     91 	bus_space_write_1(ga->ga_bst, bsh, target, saved_data);
     92 
     93 	bus_space_unmap(ga->ga_bst, bsh, size);
     94 
     95 	return rv;
     96 }
     97 
     98 static void
     99 ds1553rtc_attach(device_t parent, device_t self, void *aux)
    100 {
    101 	struct mk48txx_softc * const sc = device_private(self);
    102 	struct generic_attach_args * const ga = aux;
    103 	int error;
    104 	bus_size_t size = ga->ga_size;
    105 
    106 	if (size == OBIOCF_SIZE_DEFAULT)
    107 		size = 8192;
    108 
    109 	sc->sc_dev = self;
    110 	sc->sc_bst = ga->ga_bst;
    111 	sc->sc_model = "ds1553";
    112 	sc->sc_flag = MK48TXX_HAVE_CENT_REG;
    113 	error = bus_space_map(sc->sc_bst, ga->ga_addr, size, 0, &sc->sc_bsh);
    114 	if (error) {
    115 		aprint_error(": failed to map registers: %d\n", error);
    116 		return;
    117 	}
    118 
    119 	mk48txx_attach(sc);
    120 	aprint_normal("\n");
    121 }
    122