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>
 
 
14
15#include "iim.h"
16#include "hardware.h"
17
18static int mx25_cpu_rev = -1;
19
20static int mx25_read_cpu_rev(void)
21{
22	u32 rev;
 
 
 
 
 
 
 
 
23
24	rev = __raw_readl(MX25_IO_ADDRESS(MX25_IIM_BASE_ADDR + MXC_IIMSREV));
25	switch (rev) {
26	case 0x00:
27		return IMX_CHIP_REVISION_1_0;
28	case 0x01:
29		return IMX_CHIP_REVISION_1_1;
30	default:
31		return IMX_CHIP_REVISION_UNKNOWN;
32	}
33}
34
35int mx25_revision(void)
36{
37	if (mx25_cpu_rev == -1)
38		mx25_cpu_rev = mx25_read_cpu_rev();
39
40	return mx25_cpu_rev;
41}
42EXPORT_SYMBOL(mx25_revision);

 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>
14#include <linux/of.h>
15#include <linux/of_address.h>
16
17#include "iim.h"
18#include "hardware.h"
19
20static int mx25_cpu_rev = -1;
21
22static int mx25_read_cpu_rev(void)
23{
24	u32 rev;
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);
33
 
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
44int 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}
51EXPORT_SYMBOL(mx25_revision);