1 | // SPDX-License-Identifier: GPL-2.0-or-later |
---|---|
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 |
7 | */ |
8 | #include <linux/module.h> |
9 | #include <linux/io.h> |
10 | #include <linux/of.h> |
11 | #include <linux/of_address.h> |
12 | |
13 | #include "iim.h" |
14 | #include "hardware.h" |
15 | |
16 | static int mx25_cpu_rev = -1; |
17 | |
18 | static int mx25_read_cpu_rev(void) |
19 | { |
20 | u32 rev; |
21 | void __iomem *iim_base; |
22 | struct device_node *np; |
23 | |
24 | np = of_find_compatible_node(NULL, NULL, compat: "fsl,imx25-iim"); |
25 | iim_base = of_iomap(node: np, index: 0); |
26 | of_node_put(node: np); |
27 | BUG_ON(!iim_base); |
28 | rev = readl(addr: iim_base + MXC_IIMSREV); |
29 | iounmap(addr: iim_base); |
30 | |
31 | switch (rev) { |
32 | case 0x00: |
33 | return IMX_CHIP_REVISION_1_0; |
34 | case 0x01: |
35 | return IMX_CHIP_REVISION_1_1; |
36 | case 0x02: |
37 | return IMX_CHIP_REVISION_1_2; |
38 | default: |
39 | return IMX_CHIP_REVISION_UNKNOWN; |
40 | } |
41 | } |
42 | |
43 | int mx25_revision(void) |
44 | { |
45 | if (mx25_cpu_rev == -1) |
46 | mx25_cpu_rev = mx25_read_cpu_rev(); |
47 | |
48 | return mx25_cpu_rev; |
49 | } |
50 | EXPORT_SYMBOL(mx25_revision); |
51 |