1 /*
2  * clock2xxx.c - OMAP2xxx-specific clock integration 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 "cm.h"
30 #include "cm-regbits-24xx.h"
31 
32 struct clk *vclk, *sclk, *dclk;
33 
34 /*
35  * Omap24xx specific clock functions
36  */
37 
38 /*
39  * Set clocks for bypass mode for reboot to work.
40  */
omap2xxx_clk_prepare_for_reboot(void)41 void omap2xxx_clk_prepare_for_reboot(void)
42 {
43 	u32 rate;
44 
45 	if (vclk == NULL || sclk == NULL)
46 		return;
47 
48 	rate = clk_get_rate(sclk);
49 	clk_set_rate(vclk, rate);
50 }
51 
52 /*
53  * Switch the MPU rate if specified on cmdline.  We cannot do this
54  * early until cmdline is parsed.  XXX This should be removed from the
55  * clock code and handled by the OPP layer code in the near future.
56  */
omap2xxx_clk_arch_init(void)57 static int __init omap2xxx_clk_arch_init(void)
58 {
59 	int ret;
60 
61 	if (!cpu_is_omap24xx())
62 		return 0;
63 
64 	ret = omap2_clk_switch_mpurate_at_boot("virt_prcm_set");
65 	if (!ret)
66 		omap2_clk_print_new_rates("sys_ck", "dpll_ck", "mpu_ck");
67 
68 	return ret;
69 }
70 
71 arch_initcall(omap2xxx_clk_arch_init);
72 
73 
74