1 /* 2 * MX31 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 12 #include <linux/module.h> 13 #include <linux/io.h> 14 #include <mach/hardware.h> 15 #include <mach/iim.h> 16 #include <mach/common.h> 17 18 static int mx31_cpu_rev = -1; 19 20 static struct { 21 u8 srev; 22 const char *name; 23 unsigned int rev; 24 } mx31_cpu_type[] = { 25 { .srev = 0x00, .name = "i.MX31(L)", .rev = IMX_CHIP_REVISION_1_0 }, 26 { .srev = 0x10, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 }, 27 { .srev = 0x11, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 }, 28 { .srev = 0x12, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 }, 29 { .srev = 0x13, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 }, 30 { .srev = 0x14, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_2 }, 31 { .srev = 0x15, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_2 }, 32 { .srev = 0x28, .name = "i.MX31", .rev = IMX_CHIP_REVISION_2_0 }, 33 { .srev = 0x29, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_2_0 }, 34 }; 35 36 static int mx31_read_cpu_rev(void) 37 { 38 u32 i, srev; 39 40 /* read SREV register from IIM module */ 41 srev = __raw_readl(MX31_IO_ADDRESS(MX31_IIM_BASE_ADDR + MXC_IIMSREV)); 42 srev &= 0xff; 43 44 for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++) 45 if (srev == mx31_cpu_type[i].srev) { 46 imx_print_silicon_rev(mx31_cpu_type[i].name, 47 mx31_cpu_type[i].rev); 48 return mx31_cpu_type[i].rev; 49 } 50 51 imx_print_silicon_rev("i.MX31", IMX_CHIP_REVISION_UNKNOWN); 52 return IMX_CHIP_REVISION_UNKNOWN; 53 } 54 55 int mx31_revision(void) 56 { 57 if (mx31_cpu_rev == -1) 58 mx31_cpu_rev = mx31_read_cpu_rev(); 59 60 return mx31_cpu_rev; 61 } 62 EXPORT_SYMBOL(mx31_revision); 63