Daniel Mack | 52939c0 | 2009-11-21 20:17:18 +0100 | [diff] [blame] | 1 | /* |
Uwe Kleine-König | 27ad4bf | 2011-03-17 09:40:29 +0100 | [diff] [blame] | 2 | * MX31 CPU type detection |
Daniel Mack | 52939c0 | 2009-11-21 20:17:18 +0100 | [diff] [blame] | 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 | #include <mach/hardware.h> |
Shawn Guo | e337247 | 2012-09-13 21:01:00 +0800 | [diff] [blame] | 15 | |
| 16 | #include "common.h" |
Shawn Guo | 17c342a | 2012-09-13 21:18:39 +0800 | [diff] [blame] | 17 | #include "iim.h" |
Daniel Mack | 52939c0 | 2009-11-21 20:17:18 +0100 | [diff] [blame] | 18 | |
Jason Liu | ab116a8 | 2011-08-26 13:35:21 +0800 | [diff] [blame] | 19 | static int mx31_cpu_rev = -1; |
Daniel Mack | 52939c0 | 2009-11-21 20:17:18 +0100 | [diff] [blame] | 20 | |
Uwe Kleine-König | 27ad4bf | 2011-03-17 09:40:29 +0100 | [diff] [blame] | 21 | static struct { |
Daniel Mack | 52939c0 | 2009-11-21 20:17:18 +0100 | [diff] [blame] | 22 | u8 srev; |
| 23 | const char *name; |
Daniel Mack | 52939c0 | 2009-11-21 20:17:18 +0100 | [diff] [blame] | 24 | unsigned int rev; |
Jason Liu | ab116a8 | 2011-08-26 13:35:21 +0800 | [diff] [blame] | 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 }, |
Daniel Mack | 52939c0 | 2009-11-21 20:17:18 +0100 | [diff] [blame] | 35 | }; |
| 36 | |
Jason Liu | ab116a8 | 2011-08-26 13:35:21 +0800 | [diff] [blame] | 37 | static int mx31_read_cpu_rev(void) |
Daniel Mack | 52939c0 | 2009-11-21 20:17:18 +0100 | [diff] [blame] | 38 | { |
| 39 | u32 i, srev; |
| 40 | |
| 41 | /* read SREV register from IIM module */ |
Sascha Hauer | fdb0387 | 2010-10-08 16:00:09 +0200 | [diff] [blame] | 42 | srev = __raw_readl(MX31_IO_ADDRESS(MX31_IIM_BASE_ADDR + MXC_IIMSREV)); |
Jason Liu | ab116a8 | 2011-08-26 13:35:21 +0800 | [diff] [blame] | 43 | srev &= 0xff; |
Daniel Mack | 52939c0 | 2009-11-21 20:17:18 +0100 | [diff] [blame] | 44 | |
| 45 | for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++) |
| 46 | if (srev == mx31_cpu_type[i].srev) { |
Jason Liu | ab116a8 | 2011-08-26 13:35:21 +0800 | [diff] [blame] | 47 | imx_print_silicon_rev(mx31_cpu_type[i].name, |
| 48 | mx31_cpu_type[i].rev); |
| 49 | return mx31_cpu_type[i].rev; |
Daniel Mack | 52939c0 | 2009-11-21 20:17:18 +0100 | [diff] [blame] | 50 | } |
| 51 | |
Jason Liu | ab116a8 | 2011-08-26 13:35:21 +0800 | [diff] [blame] | 52 | imx_print_silicon_rev("i.MX31", IMX_CHIP_REVISION_UNKNOWN); |
| 53 | return IMX_CHIP_REVISION_UNKNOWN; |
Daniel Mack | 52939c0 | 2009-11-21 20:17:18 +0100 | [diff] [blame] | 54 | } |
Jason Liu | ab116a8 | 2011-08-26 13:35:21 +0800 | [diff] [blame] | 55 | |
| 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); |