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Paul Walmsley0fd0c212011-02-25 15:49:53 -07001/*
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 <plat/clock.h>
18
19#include "clock.h"
20#include "cm2xxx_3xxx.h"
21#include "cm-regbits-24xx.h"
22
23/* Private functions */
24
25/**
26 * _allow_idle - enable DPLL autoidle bits
27 * @clk: struct clk * of the DPLL to operate on
28 *
29 * Enable DPLL automatic idle control. The DPLL will enter low-power
30 * stop when its downstream clocks are gated. No return value.
31 * REVISIT: DPLL can optionally enter low-power bypass by writing 0x1
32 * instead. Add some mechanism to optionally enter this mode.
33 */
34static void _allow_idle(struct clk *clk)
35{
36 if (!clk || !clk->dpll_data)
37 return;
38
39 omap2xxx_cm_set_dpll_auto_low_power_stop();
40}
41
42/**
43 * _deny_idle - prevent DPLL from automatically idling
44 * @clk: struct clk * of the DPLL to operate on
45 *
46 * Disable DPLL automatic idle control. No return value.
47 */
48static void _deny_idle(struct clk *clk)
49{
50 if (!clk || !clk->dpll_data)
51 return;
52
53 omap2xxx_cm_set_dpll_disable_autoidle();
54}
55
56
57/* Public data */
58
59const struct clkops clkops_omap2xxx_dpll_ops = {
60 .allow_idle = _allow_idle,
61 .deny_idle = _deny_idle,
62};
63