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 15 #include "common.h" 16 #include "hardware.h" 17 #include "iim.h" 18 19 static int mx31_cpu_rev = -1; 20 21 static struct { 22 u8 srev; 23 const char *name; 24 unsigned int rev; 25 } mx31_cpu_type[] = { 26 { .srev = 0x00, .name = "i.MX31(L)", .rev = IMX_CHIP_REVISION_1_0 }, 27 { .srev = 0x10, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 }, 28 { .srev = 0x11, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 }, 29 { .srev = 0x12, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 }, 30 { .srev = 0x13, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 }, 31 { .srev = 0x14, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_2 }, 32 { .srev = 0x15, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_2 }, 33 { .srev = 0x28, .name = "i.MX31", .rev = IMX_CHIP_REVISION_2_0 }, 34 { .srev = 0x29, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_2_0 }, 35 }; 36 37 static int 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 srev &= 0xff; 44 45 for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++) 46 if (srev == mx31_cpu_type[i].srev) { 47 imx_print_silicon_rev(mx31_cpu_type[i].name, 48 mx31_cpu_type[i].rev); 49 return mx31_cpu_type[i].rev; 50 } 51 52 imx_print_silicon_rev("i.MX31", IMX_CHIP_REVISION_UNKNOWN); 53 return IMX_CHIP_REVISION_UNKNOWN; 54 } 55 56 int mx31_revision(void) 57 { 58 if (mx31_cpu_rev == -1) 59 mx31_cpu_rev = mx31_read_cpu_rev(); 60 61 return mx31_cpu_rev; 62 } 63 EXPORT_SYMBOL(mx31_revision); 64