| /* |
| * MX31 CPU type detection |
| * |
| * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/io.h> |
| #include <mach/hardware.h> |
| |
| #include "common.h" |
| #include "iim.h" |
| |
| static int mx31_cpu_rev = -1; |
| |
| static struct { |
| u8 srev; |
| const char *name; |
| unsigned int rev; |
| } mx31_cpu_type[] = { |
| { .srev = 0x00, .name = "i.MX31(L)", .rev = IMX_CHIP_REVISION_1_0 }, |
| { .srev = 0x10, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 }, |
| { .srev = 0x11, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 }, |
| { .srev = 0x12, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 }, |
| { .srev = 0x13, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 }, |
| { .srev = 0x14, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_2 }, |
| { .srev = 0x15, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_2 }, |
| { .srev = 0x28, .name = "i.MX31", .rev = IMX_CHIP_REVISION_2_0 }, |
| { .srev = 0x29, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_2_0 }, |
| }; |
| |
| static int mx31_read_cpu_rev(void) |
| { |
| u32 i, srev; |
| |
| /* read SREV register from IIM module */ |
| srev = __raw_readl(MX31_IO_ADDRESS(MX31_IIM_BASE_ADDR + MXC_IIMSREV)); |
| srev &= 0xff; |
| |
| for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++) |
| if (srev == mx31_cpu_type[i].srev) { |
| imx_print_silicon_rev(mx31_cpu_type[i].name, |
| mx31_cpu_type[i].rev); |
| return mx31_cpu_type[i].rev; |
| } |
| |
| imx_print_silicon_rev("i.MX31", IMX_CHIP_REVISION_UNKNOWN); |
| return IMX_CHIP_REVISION_UNKNOWN; |
| } |
| |
| int mx31_revision(void) |
| { |
| if (mx31_cpu_rev == -1) |
| mx31_cpu_rev = mx31_read_cpu_rev(); |
| |
| return mx31_cpu_rev; |
| } |
| EXPORT_SYMBOL(mx31_revision); |