1 /*
2  * OMAP2xxx sys_clk-specific clock code
3  *
4  * Copyright (C) 2005-2008 Texas Instruments, Inc.
5  * Copyright (C) 2004-2010 Nokia Corporation
6  *
7  * Contacts:
8  * Richard Woodruff <r-woodruff2@ti.com>
9  * Paul Walmsley
10  *
11  * Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
12  * Gordon McNutt and RidgeRun, Inc.
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License version 2 as
16  * published by the Free Software Foundation.
17  */
18 #undef DEBUG
19 
20 #include <linux/kernel.h>
21 #include <linux/errno.h>
22 #include <linux/clk.h>
23 #include <linux/io.h>
24 
25 #include <plat/clock.h>
26 
27 #include "clock.h"
28 #include "clock2xxx.h"
29 #include "prm2xxx_3xxx.h"
30 #include "prm-regbits-24xx.h"
31 
32 void __iomem *prcm_clksrc_ctrl;
33 
omap2xxx_get_sysclkdiv(void)34 u32 omap2xxx_get_sysclkdiv(void)
35 {
36 	u32 div;
37 
38 	div = __raw_readl(prcm_clksrc_ctrl);
39 	div &= OMAP_SYSCLKDIV_MASK;
40 	div >>= OMAP_SYSCLKDIV_SHIFT;
41 
42 	return div;
43 }
44 
omap2xxx_sys_clk_recalc(struct clk * clk)45 unsigned long omap2xxx_sys_clk_recalc(struct clk *clk)
46 {
47 	return clk->parent->rate / omap2xxx_get_sysclkdiv();
48 }
49 
50 
51