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d27536c6 JL |
1 | /* |
2 | * MX25 CPU type detection | |
3 | * | |
4 | * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> | |
5 | * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | */ | |
12 | #include <linux/module.h> | |
13 | #include <linux/io.h> | |
8b88f7ef FE |
14 | #include <linux/of.h> |
15 | #include <linux/of_address.h> | |
17c342ae SG |
16 | |
17 | #include "iim.h" | |
50f2de61 | 18 | #include "hardware.h" |
d27536c6 JL |
19 | |
20 | static int mx25_cpu_rev = -1; | |
21 | ||
22 | static int mx25_read_cpu_rev(void) | |
23 | { | |
24 | u32 rev; | |
8b88f7ef FE |
25 | void __iomem *iim_base; |
26 | struct device_node *np; | |
27 | ||
28 | np = of_find_compatible_node(NULL, NULL, "fsl,imx25-iim"); | |
29 | iim_base = of_iomap(np, 0); | |
30 | BUG_ON(!iim_base); | |
31 | rev = readl(iim_base + MXC_IIMSREV); | |
32 | iounmap(iim_base); | |
d27536c6 | 33 | |
d27536c6 JL |
34 | switch (rev) { |
35 | case 0x00: | |
36 | return IMX_CHIP_REVISION_1_0; | |
37 | case 0x01: | |
38 | return IMX_CHIP_REVISION_1_1; | |
39 | default: | |
40 | return IMX_CHIP_REVISION_UNKNOWN; | |
41 | } | |
42 | } | |
43 | ||
44 | int mx25_revision(void) | |
45 | { | |
46 | if (mx25_cpu_rev == -1) | |
47 | mx25_cpu_rev = mx25_read_cpu_rev(); | |
48 | ||
49 | return mx25_cpu_rev; | |
50 | } | |
51 | EXPORT_SYMBOL(mx25_revision); |