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

   1/*
   2 *  This program is free software; you can redistribute it and/or modify it
   3 *  under the terms of the GNU General Public License version 2 as published
   4 *  by the Free Software Foundation.
   5 *
   6 *  Copyright (C) 2011 Gabor Juhos <juhosg@openwrt.org>
   7 *  Copyright (C) 2013 John Crispin <john@phrozen.org>
   8 */
   9
  10#include <linux/kernel.h>
  11#include <linux/init.h>
  12#include <linux/export.h>
  13#include <linux/clkdev.h>
  14#include <linux/clk.h>
  15
  16#include <asm/time.h>
  17
  18#include "common.h"
  19
  20struct clk {
  21        struct clk_lookup cl;
  22        unsigned long rate;
  23};
  24
  25void ralink_clk_add(const char *dev, unsigned long rate)
  26{
  27        struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
  28
  29        if (!clk)
  30                panic("failed to add clock");
  31
  32        clk->cl.dev_id = dev;
  33        clk->cl.clk = clk;
  34
  35        clk->rate = rate;
  36
  37        clkdev_add(&clk->cl);
  38}
  39
  40/*
  41 * Linux clock API
  42 */
  43int clk_enable(struct clk *clk)
  44{
  45        return 0;
  46}
  47EXPORT_SYMBOL_GPL(clk_enable);
  48
  49void clk_disable(struct clk *clk)
  50{
  51}
  52EXPORT_SYMBOL_GPL(clk_disable);
  53
  54unsigned long clk_get_rate(struct clk *clk)
  55{
  56        if (!clk)
  57                return 0;
  58
  59        return clk->rate;
  60}
  61EXPORT_SYMBOL_GPL(clk_get_rate);
  62
  63int clk_set_rate(struct clk *clk, unsigned long rate)
  64{
  65        return -1;
  66}
  67EXPORT_SYMBOL_GPL(clk_set_rate);
  68
  69long clk_round_rate(struct clk *clk, unsigned long rate)
  70{
  71        return -1;
  72}
  73EXPORT_SYMBOL_GPL(clk_round_rate);
  74
  75void __init plat_time_init(void)
  76{
  77        struct clk *clk;
  78
  79        ralink_of_remap();
  80
  81        ralink_clk_init();
  82        clk = clk_get_sys("cpu", NULL);
  83        if (IS_ERR(clk))
  84                panic("unable to get CPU clock, err=%ld", PTR_ERR(clk));
  85        pr_info("CPU Clock: %ldMHz\n", clk_get_rate(clk) / 1000000);
  86        mips_hpt_frequency = clk_get_rate(clk) / 2;
  87        clk_put(clk);
  88        timer_probe();
  89}
  90