target/linux/adm5120/files/arch/mips/adm5120/clock.c

   1 /*
   2  *  $Id$
   3  *
   4  *  ADM5120 minimal CLK API implementation
   5  *
   6  *  Copyright (C) 2007 OpenWrt.org
   7  *  Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
   8  *
   9  *  This file was based on the CLK API implementation in:
  10  *      arch/mips/tx4938/toshiba_rbtx4938/setup.c
  11  *      Copyright (C) 2000-2001 Toshiba Corporation
  12  *      2003-2005 (c) MontaVista Software, Inc.
  13  *
  14  *  This program is free software; you can redistribute it and/or
  15  *  modify it under the terms of the GNU General Public License
  16  *  as published by the Free Software Foundation; either version 2
  17  *  of the License, or (at your option) any later version.
  18  *
  19  *  This program is distributed in the hope that it will be useful,
  20  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  *  GNU General Public License for more details.
  23  *
  24  *  You should have received a copy of the GNU General Public License
  25  *  along with this program; if not, write to the
  26  *  Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  27  *  Boston, MA  02110-1301, USA.
  28  *
  29  */
  30
  31 #include <linux/kernel.h>
  32 #include <linux/string.h>
  33 #include <linux/module.h>
  34 #include <linux/err.h>
  35 #include <linux/clk.h>
  36
  37 #include <asm/mach-adm5120/adm5120_defs.h>
  38
  39 struct clk {
  40         unsigned long rate;
  41 };
  42
  43 static struct clk uart_clk = {
  44         .rate = ADM5120_UART_CLOCK
  45 };
  46
  47 struct clk *clk_get(struct device *dev, const char *id)
  48 {
  49        if (!strcmp(id, "UARTCLK"))
  50                return &uart_clk;
  51
  52        return ERR_PTR(-ENOENT);
  53 }
  54 EXPORT_SYMBOL(clk_get);
  55
  56 int clk_enable(struct clk *clk)
  57 {
  58        return 0;
  59 }
  60 EXPORT_SYMBOL(clk_enable);
  61
  62 void clk_disable(struct clk *clk)
  63 {
  64 }
  65 EXPORT_SYMBOL(clk_disable);
  66
  67 unsigned long clk_get_rate(struct clk *clk)
  68 {
  69        return clk->rate;
  70 }
  71 EXPORT_SYMBOL(clk_get_rate);
  72
  73 void clk_put(struct clk *clk)
  74 {
  75 }
  76 EXPORT_SYMBOL(clk_put);