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
14static int mx35_cpu_rev = -1;
15
16static 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
40int 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}
47EXPORT_SYMBOL(mx35_revision);

 
 1/*
 2 * MX35 CPU type detection
 3 *
 4 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
 5 *
 6 * This program is free software; you can redistribute it and/or modify
 7 * it under the terms of the GNU General Public License as published by
 8 * the Free Software Foundation; either version 2 of the License, or
 9 * (at your option) any later version.
10 */
11#include <linux/module.h>
 
12#include <linux/io.h>
13
14#include "hardware.h"
15#include "iim.h"
16
17static int mx35_cpu_rev = -1;
18
19static int mx35_read_cpu_rev(void)
20{
 
 
21	u32 rev;
22
23	rev = imx_readl(MX35_IO_ADDRESS(MX35_IIM_BASE_ADDR + MXC_IIMSREV));
 
 
 
 
 
24	switch (rev) {
25	case 0x00:
26		return IMX_CHIP_REVISION_1_0;
27	case 0x10:
28		return IMX_CHIP_REVISION_2_0;
29	case 0x11:
30		return IMX_CHIP_REVISION_2_1;
31	default:
32		return IMX_CHIP_REVISION_UNKNOWN;
33	}
34}
35
36int mx35_revision(void)
37{
38	if (mx35_cpu_rev == -1)
39		mx35_cpu_rev = mx35_read_cpu_rev();
40
41	return mx35_cpu_rev;
42}
43EXPORT_SYMBOL(mx35_revision);