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  */
32 static 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  */
46 static 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 */
56 const struct clk_hw_omap_ops clkhwops_omap2xxx_dpll = {
57 	.allow_idle	= _allow_idle,
58 	.deny_idle	= _deny_idle,
59 };
60