1 /*
2 * MX31 CPU type detection
3 *
4 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12 #include <linux/module.h>
13 #include <linux/io.h>
14
15 #include "common.h"
16 #include "hardware.h"
17 #include "iim.h"
18
19 static int mx31_cpu_rev = -1;
20
21 static struct {
22 u8 srev;
23 const char *name;
24 unsigned int rev;
25 } mx31_cpu_type[] = {
26 { .srev = 0x00, .name = "i.MX31(L)", .rev = IMX_CHIP_REVISION_1_0 },
27 { .srev = 0x10, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 },
28 { .srev = 0x11, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 },
29 { .srev = 0x12, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 },
30 { .srev = 0x13, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 },
31 { .srev = 0x14, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_2 },
32 { .srev = 0x15, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_2 },
33 { .srev = 0x28, .name = "i.MX31", .rev = IMX_CHIP_REVISION_2_0 },
34 { .srev = 0x29, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_2_0 },
35 };
36
mx31_read_cpu_rev(void)37 static int mx31_read_cpu_rev(void)
38 {
39 u32 i, srev;
40
41 /* read SREV register from IIM module */
42 srev = __raw_readl(MX31_IO_ADDRESS(MX31_IIM_BASE_ADDR + MXC_IIMSREV));
43 srev &= 0xff;
44
45 for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++)
46 if (srev == mx31_cpu_type[i].srev) {
47 imx_print_silicon_rev(mx31_cpu_type[i].name,
48 mx31_cpu_type[i].rev);
49 return mx31_cpu_type[i].rev;
50 }
51
52 imx_print_silicon_rev("i.MX31", IMX_CHIP_REVISION_UNKNOWN);
53 return IMX_CHIP_REVISION_UNKNOWN;
54 }
55
mx31_revision(void)56 int mx31_revision(void)
57 {
58 if (mx31_cpu_rev == -1)
59 mx31_cpu_rev = mx31_read_cpu_rev();
60
61 return mx31_cpu_rev;
62 }
63 EXPORT_SYMBOL(mx31_revision);
64