1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * MX31 CPU type detection 4 * 5 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> 6 */ 7 8 #include <linux/module.h> 9 #include <linux/io.h> 10 11 #include "common.h" 12 #include "hardware.h" 13 #include "iim.h" 14 15 static int mx31_cpu_rev = -1; 16 17 static struct { 18 u8 srev; 19 const char *name; 20 unsigned int rev; 21 } mx31_cpu_type[] = { 22 { .srev = 0x00, .name = "i.MX31(L)", .rev = IMX_CHIP_REVISION_1_0 }, 23 { .srev = 0x10, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 }, 24 { .srev = 0x11, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 }, 25 { .srev = 0x12, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_1 }, 26 { .srev = 0x13, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_1 }, 27 { .srev = 0x14, .name = "i.MX31", .rev = IMX_CHIP_REVISION_1_2 }, 28 { .srev = 0x15, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_1_2 }, 29 { .srev = 0x28, .name = "i.MX31", .rev = IMX_CHIP_REVISION_2_0 }, 30 { .srev = 0x29, .name = "i.MX31L", .rev = IMX_CHIP_REVISION_2_0 }, 31 }; 32 33 static int mx31_read_cpu_rev(void) 34 { 35 u32 i, srev; 36 37 /* read SREV register from IIM module */ 38 srev = imx_readl(MX31_IO_ADDRESS(MX31_IIM_BASE_ADDR + MXC_IIMSREV)); 39 srev &= 0xff; 40 41 for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++) 42 if (srev == mx31_cpu_type[i].srev) { 43 imx_print_silicon_rev(mx31_cpu_type[i].name, 44 mx31_cpu_type[i].rev); 45 return mx31_cpu_type[i].rev; 46 } 47 48 imx_print_silicon_rev("i.MX31", IMX_CHIP_REVISION_UNKNOWN); 49 return IMX_CHIP_REVISION_UNKNOWN; 50 } 51 52 int mx31_revision(void) 53 { 54 if (mx31_cpu_rev == -1) 55 mx31_cpu_rev = mx31_read_cpu_rev(); 56 57 return mx31_cpu_rev; 58 } 59 EXPORT_SYMBOL(mx31_revision); 60