/* * MX25 CPU type detection * * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved * * 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 <linux/of.h> #include <linux/of_address.h> #include "iim.h" #include "hardware.h" static int mx25_cpu_rev = -1; static int mx25_read_cpu_rev(void) { u32 rev; void __iomem *iim_base; struct device_node *np; np = of_find_compatible_node(NULL, NULL, "fsl,imx25-iim"); iim_base = of_iomap(np, 0); BUG_ON(!iim_base); rev = readl(iim_base + MXC_IIMSREV); iounmap(iim_base); switch (rev) { case 0x00: return IMX_CHIP_REVISION_1_0; case 0x01: return IMX_CHIP_REVISION_1_1; default: return IMX_CHIP_REVISION_UNKNOWN; } } int mx25_revision(void) { if (mx25_cpu_rev == -1) mx25_cpu_rev = mx25_read_cpu_rev(); return mx25_cpu_rev; } EXPORT_SYMBOL(mx25_revision);