/*
   * OMAP2xxx osc_clk-specific clock code
   *
   * Copyright (C) 2005-2008 Texas Instruments, Inc.
   * Copyright (C) 2004-2010 Nokia Corporation
   *
   * Contacts:
   * Richard Woodruff <r-woodruff2@ti.com>
   * Paul Walmsley
   *
   * Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
   * Gordon McNutt and RidgeRun, Inc.
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
  #undef DEBUG
  
  #include <linux/module.h>
  #include <linux/kernel.h>
  #include <linux/errno.h>
  #include <linux/clk.h>
  #include <linux/io.h>
  
  #include <plat/clock.h>
  
  #include "clock.h"
  #include "clock2xxx.h"

  #include "prm2xxx_3xxx.h"

  #include "prm-regbits-24xx.h"

  /*
   * XXX This does not actually enable the osc_ck, since the osc_ck must
   * be running for this function to be called.  Instead, this function
   * is used to disable an autoidle mode on the osc_ck.  The existing
   * clk_enable/clk_disable()-based usecounting for osc_ck should be
   * replaced with autoidle-based usecounting.
   */

  static int omap2_enable_osc_ck(struct clk *clk)
  {
  	u32 pcc;
  
  	pcc = __raw_readl(prcm_clksrc_ctrl);
  
  	__raw_writel(pcc & ~OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl);
  
  	return 0;
  }

  /*
   * XXX This does not actually disable the osc_ck, since doing so would
   * immediately halt the system.  Instead, this function is used to
   * enable an autoidle mode on the osc_ck.  The existing
   * clk_enable/clk_disable()-based usecounting for osc_ck should be
   * replaced with autoidle-based usecounting.
   */

  static void omap2_disable_osc_ck(struct clk *clk)
  {
  	u32 pcc;
  
  	pcc = __raw_readl(prcm_clksrc_ctrl);
  
  	__raw_writel(pcc | OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl);
  }
  
  const struct clkops clkops_oscck = {
  	.enable		= omap2_enable_osc_ck,
  	.disable	= omap2_disable_osc_ck,
  };
  
  unsigned long omap2_osc_clk_recalc(struct clk *clk)
  {
  	return omap2xxx_get_apll_clkin() * omap2xxx_get_sysclkdiv();
  }