| yuezonghe | 824eb0c | 2024-06-27 02:32:26 -0700 | [diff] [blame] | 1 | /* |
| 2 | * MX35 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 | #include <linux/module.h> |
| 12 | #include <linux/io.h> |
| 13 | #include <mach/hardware.h> |
| 14 | #include <mach/iim.h> |
| 15 | |
| 16 | static int mx35_cpu_rev = -1; |
| 17 | |
| 18 | static int mx35_read_cpu_rev(void) |
| 19 | { |
| 20 | u32 rev; |
| 21 | |
| 22 | rev = __raw_readl(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSREV)); |
| 23 | switch (rev) { |
| 24 | case 0x00: |
| 25 | return IMX_CHIP_REVISION_1_0; |
| 26 | case 0x10: |
| 27 | return IMX_CHIP_REVISION_2_0; |
| 28 | case 0x11: |
| 29 | return IMX_CHIP_REVISION_2_1; |
| 30 | default: |
| 31 | return IMX_CHIP_REVISION_UNKNOWN; |
| 32 | } |
| 33 | } |
| 34 | |
| 35 | int mx35_revision(void) |
| 36 | { |
| 37 | if (mx35_cpu_rev == -1) |
| 38 | mx35_cpu_rev = mx35_read_cpu_rev(); |
| 39 | |
| 40 | return mx35_cpu_rev; |
| 41 | } |
| 42 | EXPORT_SYMBOL(mx35_revision); |