1#include <linux/clk.h>
 2#include <linux/err.h>
 3#include <linux/of.h>
 4#include <linux/slab.h>
 5#include <linux/spinlock.h>
 6#include "clk.h"
 7
 8DEFINE_SPINLOCK(imx_ccm_lock);
 9
10static struct clk * __init imx_obtain_fixed_clock_from_dt(const char *name)
11{
12	struct of_phandle_args phandle;
13	struct clk *clk = ERR_PTR(-ENODEV);
14	char *path;
15
16	path = kasprintf(GFP_KERNEL, "/clocks/%s", name);
17	if (!path)
18		return ERR_PTR(-ENOMEM);
19
20	phandle.np = of_find_node_by_path(path);
21	kfree(path);
22
23	if (phandle.np) {
24		clk = of_clk_get_from_provider(&phandle);
25		of_node_put(phandle.np);
26	}
27	return clk;
28}
29
30struct clk * __init imx_obtain_fixed_clock(
31			const char *name, unsigned long rate)
32{
33	struct clk *clk;
34
35	clk = imx_obtain_fixed_clock_from_dt(name);
36	if (IS_ERR(clk))
37		clk = imx_clk_fixed(name, rate);
38	return clk;
39}
40
41/*
42 * This fixups the register CCM_CSCMR1 write value.
43 * The write/read/divider values of the aclk_podf field
44 * of that register have the relationship described by
45 * the following table:
46 *
47 * write value       read value        divider
48 * 3b'000            3b'110            7
49 * 3b'001            3b'111            8
50 * 3b'010            3b'100            5
51 * 3b'011            3b'101            6
52 * 3b'100            3b'010            3
53 * 3b'101            3b'011            4
54 * 3b'110            3b'000            1
55 * 3b'111            3b'001            2(default)
56 *
57 * That's why we do the xor operation below.
58 */
59#define CSCMR1_FIXUP	0x00600000
60
61void imx_cscmr1_fixup(u32 *val)
62{
63	*val ^= CSCMR1_FIXUP;
64	return;
65}