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/cpu.h>
  26 #include <plat/clock.h>
  27
  28 #include "clock.h"
  29 #include "clock2xxx.h"
  30 #include "cm.h"
  31 #include "cm-regbits-24xx.h"
  32
  33 struct clk *vclk, *sclk, *dclk;
  34
  35 /*
  36  * Omap24xx specific clock functions
  37  */
  38
  39 /*
  40  * Set clocks for bypass mode for reboot to work.
  41  */
  42 void omap2xxx_clk_prepare_for_reboot(void)
  43 {
  44         u32 rate;
  45
  46         if (vclk == NULL || sclk == NULL)
  47                 return;
  48
  49         rate = clk_get_rate(sclk);
  50         clk_set_rate(vclk, rate);
  51 }
  52
  53 /*
  54  * Switch the MPU rate if specified on cmdline.  We cannot do this
  55  * early until cmdline is parsed.  XXX This should be removed from the
  56  * clock code and handled by the OPP layer code in the near future.
  57  */
  58 static int __init omap2xxx_clk_arch_init(void)
  59 {
  60         int ret;
  61
  62         if (!cpu_is_omap24xx())
  63                 return 0;
  64
  65         ret = omap2_clk_switch_mpurate_at_boot("virt_prcm_set");
  66         if (!ret)
  67                 omap2_clk_print_new_rates("sys_ck", "dpll_ck", "mpu_ck");
  68
  69         return ret;
  70 }
  71
  72 arch_initcall(omap2xxx_clk_arch_init);
  73
  74