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 0000000..db82880
--- /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);
+}