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Linux/arch/mips/ralink/clk.c

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

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