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1 | /* |
2 | * Copyright 2007 Freescale Semiconductor, Inc. All Rights Reserved. |
3 | * Copyright 2008 Juergen Beisert, kernel@pengutronix.de |
4 | * |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License |
7 | * as published by the Free Software Foundation; either version 2 |
8 | * of the License, or (at your option) any later version. |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | * GNU General Public License for more details. |
13 | * |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, |
17 | * MA 02110-1301, USA. |
18 | */ |
19 | |
20 | /* |
21 | * i.MX27 specific CPU detection code |
22 | */ |
23 | |
24 | #include <linux/io.h> |
25 | #include <linux/module.h> |
26 | |
27 | #include <mach/hardware.h> |
28 | |
29 | static int cpu_silicon_rev = -1; |
30 | static int cpu_partnumber; |
31 | |
32 | #define SYS_CHIP_ID 0x00 /* The offset of CHIP ID register */ |
33 | |
34 | static void query_silicon_parameter(void) |
35 | { |
36 | u32 val; |
37 | /* |
38 | * now we have access to the IO registers. As we need |
39 | * the silicon revision very early we read it here to |
40 | * avoid any further hooks |
41 | */ |
42 | val = __raw_readl(MX27_IO_ADDRESS(MX27_SYSCTRL_BASE_ADDR |
43 | + SYS_CHIP_ID)); |
44 | |
45 | cpu_silicon_rev = (int)(val >> 28); |
46 | cpu_partnumber = (int)((val >> 12) & 0xFFFF); |
47 | } |
48 | |
49 | /* |
50 | * Returns: |
51 | * the silicon revision of the cpu |
52 | * -EINVAL - not a mx27 |
53 | */ |
54 | int mx27_revision(void) |
55 | { |
56 | if (cpu_silicon_rev == -1) |
57 | query_silicon_parameter(); |
58 | |
59 | if (cpu_partnumber != 0x8821) |
60 | return -EINVAL; |
61 | |
62 | return cpu_silicon_rev; |
63 | } |
64 | EXPORT_SYMBOL(mx27_revision); |
65 |
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
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v3.9