release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-omap2/clock2xxx.c

   1 /*
   2  * clock2xxx.c - OMAP2xxx-specific clock integration code
   3  *
   4  * Copyright (C) 2005-2008 Texas Instruments, Inc.
   5  * Copyright (C) 2004-2010 Nokia Corporation
   6  *
   7  * Contacts:
   8  * Richard Woodruff <r-woodruff2@ti.com>
   9  * Paul Walmsley
  10  *
  11  * Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
  12  * Gordon McNutt and RidgeRun, Inc.
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  */
  18 #undef DEBUG
  19
  20 #include <linux/kernel.h>
  21 #include <linux/errno.h>
  22 #include <linux/clk.h>
  23 #include <linux/io.h>
  24
  25 #include <plat/clock.h>
  26
  27 #include "clock.h"
  28 #include "clock2xxx.h"
  29 #include "cm.h"
  30 #include "cm-regbits-24xx.h"
  31
  32 struct clk *vclk, *sclk, *dclk;
  33
  34 /*
  35  * Omap24xx specific clock functions
  36  */
  37
  38 /*
  39  * Set clocks for bypass mode for reboot to work.
  40  */
  41 void omap2xxx_clk_prepare_for_reboot(void)
  42 {
  43         u32 rate;
  44
  45         if (vclk == NULL || sclk == NULL)
  46                 return;
  47
  48         rate = clk_get_rate(sclk);
  49         clk_set_rate(vclk, rate);
  50 }
  51
  52 static int __init omap2xxx_clk_arch_init(void)
  53 {
  54         int ret;
  55
  56         if (!cpu_is_omap24xx())
  57                 return 0;
  58
  59         ret = omap2_clk_switch_mpurate_at_boot("virt_prcm_set");
  60         if (!ret)
  61                 omap2_clk_print_new_rates("sys_ck", "dpll_ck", "mpu_ck");
  62
  63         return ret;
  64 }
  65
  66 arch_initcall(omap2xxx_clk_arch_init);