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 14 #include "hardware.h" 15 #include "iim.h" 16 17 static int mx35_cpu_rev = -1; 18 19 static int mx35_read_cpu_rev(void) 20 { 21 u32 rev; 22 23 rev = imx_readl(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSREV)); 24 switch (rev) { 25 case 0x00: 26 return IMX_CHIP_REVISION_1_0; 27 case 0x10: 28 return IMX_CHIP_REVISION_2_0; 29 case 0x11: 30 return IMX_CHIP_REVISION_2_1; 31 default: 32 return IMX_CHIP_REVISION_UNKNOWN; 33 } 34 } 35 36 int mx35_revision(void) 37 { 38 if (mx35_cpu_rev == -1) 39 mx35_cpu_rev = mx35_read_cpu_rev(); 40 41 return mx35_cpu_rev; 42 } 43 EXPORT_SYMBOL(mx35_revision); 44