1 /* 2 * MX25 CPU type detection 3 * 4 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> 5 * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation; either version 2 of the License, or 10 * (at your option) any later version. 11 */ 12 #include <linux/module.h> 13 #include <linux/io.h> 14 #include <mach/hardware.h> 15 #include <mach/iim.h> 16 17 static int mx25_cpu_rev = -1; 18 19 static int mx25_read_cpu_rev(void) 20 { 21 u32 rev; 22 23 rev = __raw_readl(MX25_IO_ADDRESS(MX25_IIM_BASE_ADDR + MXC_IIMSREV)); 24 switch (rev) { 25 case 0x00: 26 return IMX_CHIP_REVISION_1_0; 27 case 0x01: 28 return IMX_CHIP_REVISION_1_1; 29 default: 30 return IMX_CHIP_REVISION_UNKNOWN; 31 } 32 } 33 34 int mx25_revision(void) 35 { 36 if (mx25_cpu_rev == -1) 37 mx25_cpu_rev = mx25_read_cpu_rev(); 38 39 return mx25_cpu_rev; 40 } 41 EXPORT_SYMBOL(mx25_revision); 42