1 /*
2 * (C) Gražvydas "notaz" Ignotas, 2009-2010
3 *
4 * This work is licensed under the terms of any of these licenses
5 * (at your option):
6 * - GNU GPL, version 2 or later.
7 * - GNU LGPL, version 2.1 or later.
8 * - MAME license.
9 * See the COPYING file in the top-level directory.
10 */
11
12 #include <stdio.h>
13 #include <string.h>
14 #include <sys/types.h>
15 #include <sys/stat.h>
16 #include <fcntl.h>
17 #include <sys/mman.h>
18 #include <unistd.h>
19
20 #include "soc.h"
21
22 volatile unsigned short *memregs;
23 volatile unsigned int *memregl;
24 int memdev = -1;
25
26 unsigned int (*gp2x_get_ticks_ms)(void);
27 unsigned int (*gp2x_get_ticks_us)(void);
28
soc_detect(void)29 gp2x_soc_t soc_detect(void)
30 {
31 volatile unsigned short *memregs;
32 volatile unsigned int *memregl;
33 static gp2x_soc_t ret = -2;
34 int pollux_chipname[0x30/4 + 1];
35 char *pollux_chipname_c = (char *)pollux_chipname;
36 int memdev_tmp;
37 int i;
38
39 if ((int)ret != -2)
40 /* already detected */
41 return ret;
42
43 memdev_tmp = open("/dev/mem", O_RDONLY);
44 if (memdev_tmp == -1)
45 {
46 perror("open(/dev/mem)");
47 ret = -1;
48 return -1;
49 }
50
51 memregs = mmap(0, 0x20000, PROT_READ, MAP_SHARED,
52 memdev_tmp, 0xc0000000);
53 if (memregs == MAP_FAILED)
54 {
55 perror("mmap(memregs)");
56 close(memdev_tmp);
57 ret = -1;
58 return -1;
59 }
60 memregl = (volatile void *)memregs;
61
62 if (memregs[0x1836>>1] == 0x2330)
63 {
64 printf("looks like this is MMSP2\n");
65 ret = SOCID_MMSP2;
66 goto out;
67 }
68
69 /* perform word reads. Byte reads might also work,
70 * but we don't want to play with that. */
71 for (i = 0; i < 0x30; i += 4)
72 {
73 pollux_chipname[i >> 2] = memregl[(0x1f810 + i) >> 2];
74 }
75 pollux_chipname_c[0x30] = 0;
76
77 for (i = 0; i < 0x30; i++)
78 {
79 unsigned char c = pollux_chipname_c[i];
80 if (c < 0x20 || c > 0x7f)
81 goto not_pollux_like;
82 }
83
84 printf("found pollux-like id: \"%s\"\n", pollux_chipname_c);
85
86 if (strncmp(pollux_chipname_c, "MAGICEYES-LEAPFROG-LF1000", 25) ||
87 strncmp(pollux_chipname_c, "MAGICEYES-POLLUX", 16))
88 {
89 ret = SOCID_POLLUX;
90 goto out;
91 }
92
93 not_pollux_like:
94 out:
95 munmap((void *)memregs, 0x20000);
96 close(memdev_tmp);
97 return ret;
98 }
99
100