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 17 unsigned int mx31_cpu_rev; 18 EXPORT_SYMBOL(mx31_cpu_rev); 19 20 static struct { 21 u8 srev; 22 const char *name; 23 const char *v; 24 unsigned int rev; 25 } mx31_cpu_type[] __initdata = { 26 { .srev = 0x00, .name = "i.MX31(L)", .v = "1.0", .rev = IMX_CHIP_REVISION_1_0 }, 27 { .srev = 0x10, .name = "i.MX31", .v = "1.1", .rev = IMX_CHIP_REVISION_1_1 }, 28 { .srev = 0x11, .name = "i.MX31L", .v = "1.1", .rev = IMX_CHIP_REVISION_1_1 }, 29 { .srev = 0x12, .name = "i.MX31", .v = "1.15", .rev = IMX_CHIP_REVISION_1_1 }, 30 { .srev = 0x13, .name = "i.MX31L", .v = "1.15", .rev = IMX_CHIP_REVISION_1_1 }, 31 { .srev = 0x14, .name = "i.MX31", .v = "1.2", .rev = IMX_CHIP_REVISION_1_2 }, 32 { .srev = 0x15, .name = "i.MX31L", .v = "1.2", .rev = IMX_CHIP_REVISION_1_2 }, 33 { .srev = 0x28, .name = "i.MX31", .v = "2.0", .rev = IMX_CHIP_REVISION_2_0 }, 34 { .srev = 0x29, .name = "i.MX31L", .v = "2.0", .rev = IMX_CHIP_REVISION_2_0 }, 35 }; 36 37 void __init mx31_read_cpu_rev(void) 38 { 39 u32 i, srev; 40 41 /* read SREV register from IIM module */ 42 srev = __raw_readl(MX31_IO_ADDRESS(MX31_IIM_BASE_ADDR + MXC_IIMSREV)); 43 44 for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++) 45 if (srev == mx31_cpu_type[i].srev) { 46 printk(KERN_INFO 47 "CPU identified as %s, silicon rev %s\n", 48 mx31_cpu_type[i].name, mx31_cpu_type[i].v); 49 50 mx31_cpu_rev = mx31_cpu_type[i].rev; 51 return; 52 } 53 54 mx31_cpu_rev = IMX_CHIP_REVISION_UNKNOWN; 55 56 printk(KERN_WARNING "Unknown CPU identifier. srev = %02x\n", srev); 57 } 58