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); 43