target/linux/adm5120/files-2.6.26/arch/mips/adm5120/common/clock.c

   1 /*
   2  *  ADM5120 minimal CLK API implementation
   3  *
   4  *  Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
   5  *
   6  *  This file was based on the CLK API implementation in:
   7  *      arch/mips/tx4938/toshiba_rbtx4938/setup.c
   8  *      Copyright (C) 2000-2001 Toshiba Corporation
   9  *      2003-2005 (c) MontaVista Software, Inc.
  10  *
  11  *  This program is free software; you can redistribute it and/or modify it
  12  *  under the terms of the GNU General Public License version 2 as published
  13  *  by the Free Software Foundation.
  14  *
  15  */
  16
  17 #include <linux/kernel.h>
  18 #include <linux/string.h>
  19 #include <linux/module.h>
  20 #include <linux/err.h>
  21 #include <linux/clk.h>
  22
  23 #include <asm/mach-adm5120/adm5120_defs.h>
  24
  25 struct clk {
  26         unsigned long rate;
  27 };
  28
  29 static struct clk uart_clk = {
  30         .rate = ADM5120_UART_CLOCK
  31 };
  32
  33 struct clk *clk_get(struct device *dev, const char *id)
  34 {
  35         if (!strcmp(id, "UARTCLK"))
  36                 return &uart_clk;
  37
  38         return ERR_PTR(-ENOENT);
  39 }
  40 EXPORT_SYMBOL(clk_get);
  41
  42 int clk_enable(struct clk *clk)
  43 {
  44         return 0;
  45 }
  46 EXPORT_SYMBOL(clk_enable);
  47
  48 void clk_disable(struct clk *clk)
  49 {
  50 }
  51 EXPORT_SYMBOL(clk_disable);
  52
  53 unsigned long clk_get_rate(struct clk *clk)
  54 {
  55         return clk->rate;
  56 }
  57 EXPORT_SYMBOL(clk_get_rate);
  58
  59 void clk_put(struct clk *clk)
  60 {
  61 }
  62 EXPORT_SYMBOL(clk_put);