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cpu-imx31.c
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1 /*
2  * MX31 CPU type detection
3  *
4  * Copyright (c) 2009 Daniel Mack <[email protected]>
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 #include <mach/hardware.h>
15 #include <mach/iim.h>
16 #include <mach/common.h>
17 
18 static int mx31_cpu_rev = -1;
19 
20 static struct {
22  const char *name;
23  unsigned int rev;
24 } mx31_cpu_type[] = {
25  { .srev = 0x00, .name = "i.MX31(L)", .rev = IMX_CHIP_REVISION_1_0 },
26  { .srev = 0x10, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 },
27  { .srev = 0x11, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 },
28  { .srev = 0x12, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 },
29  { .srev = 0x13, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 },
30  { .srev = 0x14, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_2 },
31  { .srev = 0x15, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_2 },
32  { .srev = 0x28, .name = "i.MX31", .rev = IMX_CHIP_REVISION_2_0 },
33  { .srev = 0x29, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_2_0 },
34 };
35 
36 static int mx31_read_cpu_rev(void)
37 {
38  u32 i, srev;
39 
40  /* read SREV register from IIM module */
42  srev &= 0xff;
43 
44  for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++)
45  if (srev == mx31_cpu_type[i].srev) {
46  imx_print_silicon_rev(mx31_cpu_type[i].name,
47  mx31_cpu_type[i].rev);
48  return mx31_cpu_type[i].rev;
49  }
50 
53 }
54 
55 int mx31_revision(void)
56 {
57  if (mx31_cpu_rev == -1)
58  mx31_cpu_rev = mx31_read_cpu_rev();
59 
60  return mx31_cpu_rev;
61 }