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