LXR linux/arch/arm/mach-omap2/clkt2xxx

   1/*
   2 * OMAP2-specific DPLL control functions
   3 *
   4 * Copyright (C) 2011 Nokia Corporation
   5 * Paul Walmsley
   6 *
   7 * This program is free software; you can redistribute it and/or modify
   8 * it under the terms of the GNU General Public License version 2 as
   9 * published by the Free Software Foundation.
  10 */
  11
  12#include <linux/kernel.h>
  13#include <linux/errno.h>
  14#include <linux/clk.h>
  15#include <linux/io.h>
  16
  17#include "clock.h"
  18#include "cm2xxx.h"
  19#include "cm-regbits-24xx.h"
  20
  21/* Private functions */
  22
  23/**
  24 * _allow_idle - enable DPLL autoidle bits
  25 * @clk: struct clk * of the DPLL to operate on
  26 *
  27 * Enable DPLL automatic idle control.  The DPLL will enter low-power
  28 * stop when its downstream clocks are gated.  No return value.
  29 * REVISIT: DPLL can optionally enter low-power bypass by writing 0x1
  30 * instead.  Add some mechanism to optionally enter this mode.
  31 */
  32static void _allow_idle(struct clk_hw_omap *clk)
  33{
  34        if (!clk || !clk->dpll_data)
  35                return;
  36
  37        omap2xxx_cm_set_dpll_auto_low_power_stop();
  38}
  39
  40/**
  41 * _deny_idle - prevent DPLL from automatically idling
  42 * @clk: struct clk * of the DPLL to operate on
  43 *
  44 * Disable DPLL automatic idle control.  No return value.
  45 */
  46static void _deny_idle(struct clk_hw_omap *clk)
  47{
  48        if (!clk || !clk->dpll_data)
  49                return;
  50
  51        omap2xxx_cm_set_dpll_disable_autoidle();
  52}
  53
  54
  55/* Public data */
  56const struct clk_hw_omap_ops clkhwops_omap2xxx_dpll = {
  57        .allow_idle     = _allow_idle,
  58        .deny_idle      = _deny_idle,
  59};
  60