projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
| d27536c6 JL |
2 | /* |
| 3 | * MX25 CPU type detection | |
| 4 | * | |
| 5 | * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de> | |
| 6 | * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved | |
| d27536c6 JL |
7 | */ |
| 8 | #include <linux/module.h> | |
| 9 | #include <linux/io.h> | |
| 8b88f7ef FE |
10 | #include <linux/of.h> |
| 11 | #include <linux/of_address.h> | |
| 17c342ae SG |
12 | |
| 13 | #include "iim.h" | |
| 50f2de61 | 14 | #include "hardware.h" |
| d27536c6 JL |
15 | |
| 16 | static int mx25_cpu_rev = -1; | |
| 17 | ||
| 18 | static int mx25_read_cpu_rev(void) | |
| 19 | { | |
| 20 | u32 rev; | |
| 8b88f7ef FE |
21 | void __iomem *iim_base; |
| 22 | struct device_node *np; | |
| 23 | ||
| 24 | np = of_find_compatible_node(NULL, NULL, "fsl,imx25-iim"); | |
| 25 | iim_base = of_iomap(np, 0); | |
| 26 | BUG_ON(!iim_base); | |
| 27 | rev = readl(iim_base + MXC_IIMSREV); | |
| 28 | iounmap(iim_base); | |
| d27536c6 | 29 | |
| d27536c6 JL |
30 | switch (rev) { |
| 31 | case 0x00: | |
| 32 | return IMX_CHIP_REVISION_1_0; | |
| 33 | case 0x01: | |
| 34 | return IMX_CHIP_REVISION_1_1; | |
| 35 | default: | |
| 36 | return IMX_CHIP_REVISION_UNKNOWN; | |
| 37 | } | |
| 38 | } | |
| 39 | ||
| 40 | int mx25_revision(void) | |
| 41 | { | |
| 42 | if (mx25_cpu_rev == -1) | |
| 43 | mx25_cpu_rev = mx25_read_cpu_rev(); | |
| 44 | ||
| 45 | return mx25_cpu_rev; | |
| 46 | } | |
| 47 | EXPORT_SYMBOL(mx25_revision); |