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 15 #include "iim.h" 16 #include "hardware.h" 17 18 static int mx25_cpu_rev = -1; 19 20 static int mx25_read_cpu_rev(void) 21 { 22 u32 rev; 23 24 rev = __raw_readl(MX25_IO_ADDRESS(MX25_IIM_BASE_ADDR + MXC_IIMSREV)); 25 switch (rev) { 26 case 0x00: 27 return IMX_CHIP_REVISION_1_0; 28 case 0x01: 29 return IMX_CHIP_REVISION_1_1; 30 default: 31 return IMX_CHIP_REVISION_UNKNOWN; 32 } 33 } 34 35 int mx25_revision(void) 36 { 37 if (mx25_cpu_rev == -1) 38 mx25_cpu_rev = mx25_read_cpu_rev(); 39 40 return mx25_cpu_rev; 41 } 42 EXPORT_SYMBOL(mx25_revision); 43