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 <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  */
_allow_idle(struct clk * clk)34 static 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  */
_deny_idle(struct clk * clk)48 static 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 
59 const struct clkops clkops_omap2xxx_dpll_ops = {
60 	.allow_idle	= _allow_idle,
61 	.deny_idle	= _deny_idle,
62 };
63 
64