projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| d27536c6 JL |
1 | /* |
| 2 | * MX25 CPU type detection | |
| 3 | * | |
| 4 | * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> | |
| 5 | * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved | |
| 6 | * | |
| 7 | * This program is free software; you can redistribute it and/or modify | |
| 8 | * it under the terms of the GNU General Public License as published by | |
| 9 | * the Free Software Foundation; either version 2 of the License, or | |
| 10 | * (at your option) any later version. | |
| 11 | */ | |
| 12 | #include <linux/module.h> | |
| 13 | #include <linux/io.h> | |
| 8b88f7ef FE |
14 | #include <linux/of.h> |
| 15 | #include <linux/of_address.h> | |
| 17c342ae SG |
16 | |
| 17 | #include "iim.h" | |
| 50f2de61 | 18 | #include "hardware.h" |
| d27536c6 JL |
19 | |
| 20 | static int mx25_cpu_rev = -1; | |
| 21 | ||
| 22 | static int mx25_read_cpu_rev(void) | |
| 23 | { | |
| 24 | u32 rev; | |
| 8b88f7ef FE |
25 | void __iomem *iim_base; |
| 26 | struct device_node *np; | |
| 27 | ||
| 28 | np = of_find_compatible_node(NULL, NULL, "fsl,imx25-iim"); | |
| 29 | iim_base = of_iomap(np, 0); | |
| 30 | BUG_ON(!iim_base); | |
| 31 | rev = readl(iim_base + MXC_IIMSREV); | |
| 32 | iounmap(iim_base); | |
| d27536c6 | 33 | |
| d27536c6 JL |
34 | switch (rev) { |
| 35 | case 0x00: | |
| 36 | return IMX_CHIP_REVISION_1_0; | |
| 37 | case 0x01: | |
| 38 | return IMX_CHIP_REVISION_1_1; | |
| 39 | default: | |
| 40 | return IMX_CHIP_REVISION_UNKNOWN; | |
| 41 | } | |
| 42 | } | |
| 43 | ||
| 44 | int mx25_revision(void) | |
| 45 | { | |
| 46 | if (mx25_cpu_rev == -1) | |
| 47 | mx25_cpu_rev = mx25_read_cpu_rev(); | |
| 48 | ||
| 49 | return mx25_cpu_rev; | |
| 50 | } | |
| 51 | EXPORT_SYMBOL(mx25_revision); |