diff options
Diffstat (limited to 'arch/arm/mach-mx3/cpu.c')
| -rw-r--r-- | arch/arm/mach-mx3/cpu.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/arch/arm/mach-mx3/cpu.c b/arch/arm/mach-mx3/cpu.c new file mode 100644 index 00000000000..db828809c67 --- /dev/null +++ b/arch/arm/mach-mx3/cpu.c @@ -0,0 +1,57 @@ +/* + * MX3 CPU type detection + * + * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + */ + +#include <linux/module.h> +#include <linux/io.h> +#include <mach/hardware.h> +#include <mach/iim.h> + +unsigned int mx31_cpu_rev; +EXPORT_SYMBOL(mx31_cpu_rev); + +struct mx3_cpu_type { + u8 srev; + const char *name; + const char *v; + unsigned int rev; +}; + +static struct mx3_cpu_type mx31_cpu_type[] __initdata = { + { .srev = 0x00, .name = "i.MX31(L)", .v = "1.0", .rev = CHIP_REV_1_0 }, + { .srev = 0x10, .name = "i.MX31", .v = "1.1", .rev = CHIP_REV_1_1 }, + { .srev = 0x11, .name = "i.MX31L", .v = "1.1", .rev = CHIP_REV_1_1 }, + { .srev = 0x12, .name = "i.MX31", .v = "1.15", .rev = CHIP_REV_1_1 }, + { .srev = 0x13, .name = "i.MX31L", .v = "1.15", .rev = CHIP_REV_1_1 }, + { .srev = 0x14, .name = "i.MX31", .v = "1.2", .rev = CHIP_REV_1_2 }, + { .srev = 0x15, .name = "i.MX31L", .v = "1.2", .rev = CHIP_REV_1_2 }, + { .srev = 0x28, .name = "i.MX31", .v = "2.0", .rev = CHIP_REV_2_0 }, + { .srev = 0x29, .name = "i.MX31L", .v = "2.0", .rev = CHIP_REV_2_0 }, +}; + +void __init mx31_read_cpu_rev(void) +{ + u32 i, srev; + + /* read SREV register from IIM module */ + srev = __raw_readl(IO_ADDRESS(IIM_BASE_ADDR) + MXC_IIMSREV); + + for (i = 0; i < ARRAY_SIZE(mx31_cpu_type); i++) + if (srev == mx31_cpu_type[i].srev) { + printk(KERN_INFO + "CPU identified as %s, silicon rev %s\n", + mx31_cpu_type[i].name, mx31_cpu_type[i].v); + + mx31_cpu_rev = mx31_cpu_type[i].rev; + return; + } + + printk(KERN_WARNING "Unknown CPU identifier. srev = %02x\n", srev); +} |