1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 *
 4 *  Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
 5 *  Copyright (C) 2013 John Crispin <john@phrozen.org>
 6 */
 7
 8#include <linux/kernel.h>
 9#include <linux/init.h>
10#include <linux/export.h>
11#include <linux/clkdev.h>
12#include <linux/clk.h>
13
14#include <asm/time.h>
15
16#include "common.h"
17
18struct clk {
19	struct clk_lookup cl;
20	unsigned long rate;
21};
22
23void ralink_clk_add(const char *dev, unsigned long rate)
24{
25	struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
26
27	if (!clk)
28		panic("failed to add clock");
29
30	clk->cl.dev_id = dev;
31	clk->cl.clk = clk;
32
33	clk->rate = rate;
34
35	clkdev_add(&clk->cl);
36}
37
38/*
39 * Linux clock API
40 */
41int clk_enable(struct clk *clk)
42{
43	return 0;
44}
45EXPORT_SYMBOL_GPL(clk_enable);
46
47void clk_disable(struct clk *clk)
48{
49}
50EXPORT_SYMBOL_GPL(clk_disable);
51
52unsigned long clk_get_rate(struct clk *clk)
53{
54	if (!clk)
55		return 0;
56
57	return clk->rate;
58}
59EXPORT_SYMBOL_GPL(clk_get_rate);
60
61int clk_set_rate(struct clk *clk, unsigned long rate)
62{
63	return -1;
64}
65EXPORT_SYMBOL_GPL(clk_set_rate);
66
67long clk_round_rate(struct clk *clk, unsigned long rate)
68{
69	return -1;
70}
71EXPORT_SYMBOL_GPL(clk_round_rate);
72
73void __init plat_time_init(void)
74{
75	struct clk *clk;
76
77	ralink_of_remap();
78
79	ralink_clk_init();
80	clk = clk_get_sys("cpu", NULL);
81	if (IS_ERR(clk))
82		panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
83	pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);
84	mips_hpt_frequency = clk_get_rate(clk) / 2;
85	clk_put(clk);
86	timer_probe();
87}