tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
73int clk_set_parent(struct clk *clk, struct clk *parent)
74{
75 WARN_ON(clk);
76 return -1;
77}
78EXPORT_SYMBOL_GPL(clk_set_parent);
79
80struct clk *clk_get_parent(struct clk *clk)
81{
82 WARN_ON(clk);
83 return NULL;
84}
85EXPORT_SYMBOL_GPL(clk_get_parent);
86
87void __init plat_time_init(void)
88{
89 struct clk *clk;
90
91 ralink_of_remap();
92
93 ralink_clk_init();
94 clk = clk_get_sys("cpu", NULL);
95 if (IS_ERR(clk))
96 panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
97 pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);
98 mips_hpt_frequency = clk_get_rate(clk) / 2;
99 clk_put(clk);
100 timer_probe();
101}