src/devices/dev_dreamcast_rtc.c

/*
 *  Copyright (C) 2006-2007  Anders Gavare.  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright  
 *     notice, this list of conditions and the following disclaimer in the 
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE   
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 *  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 *  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 *  SUCH DAMAGE.
 *   
 *
 *  $Id: dev_dreamcast_rtc.c,v 1.3 2007/02/03 20:14:23 debug Exp $
 *  
 *  Dreamcast Real-Time Clock.
 *
 *  Pretty basic; two 32-bit words at physical addresses 0x00710000 and
 *  0x00710004 hold the high and low 16-bit parts, respectively, of the
 *  system's 32-bit tv_sec value.
 *
 *  The only difference from the raw Unix concept is that the Dreamcast's
 *  clock is based at 1950 instead of 1970.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/time.h>

#include "cpu.h"
#include "device.h"
#include "machine.h"
#include "memory.h"
#include "misc.h"


/*  #define debug fatal  */

struct dreamcast_rtc_data {
        int             dummy;
};


DEVICE_ACCESS(dreamcast_rtc)
{
        /*  struct dreamcast_rtc_data *d =
            (struct dreamcast_rtc_data *) extra;  */
        uint64_t idata = 0, odata = 0;
        struct timeval tv;

        if (writeflag == MEM_WRITE)
                idata = memory_readmax64(cpu, data, len);

        switch (relative_addr) {

        case 0:
        case 4:
                if (writeflag == MEM_WRITE)
                        debug("[ dreamcast_rtc: Writes are ignored, only "
                            "reads are supported. ]\n");

                gettimeofday(&tv, NULL);

                /*  Offset by 20 years:  */
                odata = tv.tv_sec + 631152000;

                if (relative_addr == 0)
                        odata = (odata >> 16) & 0xffff;
                else
                        odata &= 0xffff;
                break;

        default:if (writeflag == MEM_READ) {
                        fatal("[ dreamcast_rtc: read from addr 0x%x ]\n",
                            (int)relative_addr);
                } else {
                        fatal("[ dreamcast_rtc: write to addr 0x%x: 0x%x ]\n",
                            (int)relative_addr, (int)idata);
                }
        }

        if (writeflag == MEM_READ)
                memory_writemax64(cpu, data, len, odata);

        return 1;
}


DEVINIT(dreamcast_rtc)
{
        struct machine *machine = devinit->machine;
        struct dreamcast_rtc_data *d =
            malloc(sizeof(struct dreamcast_rtc_data));
        if (d == NULL) {
                fprintf(stderr, "out of memory\n");
                exit(1);
        }
        memset(d, 0, sizeof(struct dreamcast_rtc_data));

        memory_device_register(machine->memory, devinit->name,
            0x00710000, 0x100, dev_dreamcast_rtc_access, d, DM_DEFAULT, NULL);

        return 1;
}

1	/*
2	* Copyright (C) 2006-2007 Anders Gavare. All rights reserved.
3	*
4	* Redistribution and use in source and binary forms, with or without
5	* modification, are permitted provided that the following conditions are met:
6	*
7	* 1. Redistributions of source code must retain the above copyright
8	* notice, this list of conditions and the following disclaimer.
9	* 2. Redistributions in binary form must reproduce the above copyright
10	* notice, this list of conditions and the following disclaimer in the
11	* documentation and/or other materials provided with the distribution.
12	* 3. The name of the author may not be used to endorse or promote products
13	* derived from this software without specific prior written permission.
14	*
15	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25	* SUCH DAMAGE.
26	*
27	*
28	* $Id: dev_dreamcast_rtc.c,v 1.3 2007/02/03 20:14:23 debug Exp $
29	*
30	* Dreamcast Real-Time Clock.
31	*
32	* Pretty basic; two 32-bit words at physical addresses 0x00710000 and
33	* 0x00710004 hold the high and low 16-bit parts, respectively, of the
34	* system's 32-bit tv_sec value.
35	*
36	* The only difference from the raw Unix concept is that the Dreamcast's
37	* clock is based at 1950 instead of 1970.
38	*/
39
40	#include <stdio.h>
41	#include <stdlib.h>
42	#include <string.h>
43	#include <sys/time.h>
44
45	#include "cpu.h"
46	#include "device.h"
47	#include "machine.h"
48	#include "memory.h"
49	#include "misc.h"
50
51
52	/* #define debug fatal */
53
54	struct dreamcast_rtc_data {
55	int dummy;
56	};
57
58
59	DEVICE_ACCESS(dreamcast_rtc)
60	{
61	/* struct dreamcast_rtc_data *d =
62	(struct dreamcast_rtc_data ) extra; /
63	uint64_t idata = 0, odata = 0;
64	struct timeval tv;
65
66	if (writeflag == MEM_WRITE)
67	idata = memory_readmax64(cpu, data, len);
68
69	switch (relative_addr) {
70
71	case 0:
72	case 4:
73	if (writeflag == MEM_WRITE)
74	debug("[ dreamcast_rtc: Writes are ignored, only "
75	"reads are supported. ]\n");
76
77	gettimeofday(&tv, NULL);
78
79	/* Offset by 20 years: */
80	odata = tv.tv_sec + 631152000;
81
82	if (relative_addr == 0)
83	odata = (odata >> 16) & 0xffff;
84	else
85	odata &= 0xffff;
86	break;
87
88	default:if (writeflag == MEM_READ) {
89	fatal("[ dreamcast_rtc: read from addr 0x%x ]\n",
90	(int)relative_addr);
91	} else {
92	fatal("[ dreamcast_rtc: write to addr 0x%x: 0x%x ]\n",
93	(int)relative_addr, (int)idata);
94	}
95	}
96
97	if (writeflag == MEM_READ)
98	memory_writemax64(cpu, data, len, odata);
99
100	return 1;
101	}
102
103
104	DEVINIT(dreamcast_rtc)
105	{
106	struct machine *machine = devinit->machine;
107	struct dreamcast_rtc_data *d =
108	malloc(sizeof(struct dreamcast_rtc_data));
109	if (d == NULL) {
110	fprintf(stderr, "out of memory\n");
111	exit(1);
112	}
113	memset(d, 0, sizeof(struct dreamcast_rtc_data));
114
115	memory_device_register(machine->memory, devinit->name,
116	0x00710000, 0x100, dev_dreamcast_rtc_access, d, DM_DEFAULT, NULL);
117
118	return 1;
119	}
120