| /* |
| * 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); |