LXR linux/arch/mips/ralink/clk.c

   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}
  88