1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * MX35 CPU type detection
4 *
5 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
6 */
7 #include <linux/module.h>
8 #include <linux/of_address.h>
9 #include <linux/io.h>
10
11 #include "hardware.h"
12 #include "iim.h"
13
14 static int mx35_cpu_rev = -1;
15
16 static int mx35_read_cpu_rev(void)
17 {
18 void __iomem *iim_base;
19 struct device_node *np;
20 u32 rev;
21
22 np = of_find_compatible_node(NULL, NULL, "fsl,imx35-iim");
23 iim_base = of_iomap(np, 0);
24 of_node_put(np);
25 BUG_ON(!iim_base);
26
27 rev = imx_readl(iim_base + MXC_IIMSREV);
28 switch (rev) {
29 case 0x00:
30 return IMX_CHIP_REVISION_1_0;
31 case 0x10:
32 return IMX_CHIP_REVISION_2_0;
33 case 0x11:
34 return IMX_CHIP_REVISION_2_1;
35 default:
36 return IMX_CHIP_REVISION_UNKNOWN;
37 }
38 }
39
40 int mx35_revision(void)
41 {
42 if (mx35_cpu_rev == -1)
43 mx35_cpu_rev = mx35_read_cpu_rev();
44
45 return mx35_cpu_rev;
46 }
47 EXPORT_SYMBOL(mx35_revision);
48
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