aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/mach-omap2/clock2xxx.c
blob: 94fb8a67b50300546ea2ce8bc7f11e9d76c2918a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
/*
 * clock2xxx.c - OMAP2xxx-specific clock integration code
 *
 * Copyright (C) 2005-2008 Texas Instruments, Inc.
 * Copyright (C) 2004-2010 Nokia Corporation
 *
 * Contacts:
 * Richard Woodruff <r-woodruff2@ti.com>
 * Paul Walmsley
 *
 * Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
 * Gordon McNutt and RidgeRun, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#undef DEBUG

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/clk.h>
#include <linux/io.h>

#include <plat/clock.h>

#include "clock.h"
#include "clock2xxx.h"
#include "cm.h"
#include "cm-regbits-24xx.h"

struct clk *vclk, *sclk, *dclk;

/*
 * Omap24xx specific clock functions
 */

#ifdef CONFIG_ARCH_OMAP2430

/**
 * omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS
 * @clk: struct clk * being enabled
 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
 *
 * OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the
 * CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE.  This custom function
 * passes back the correct CM_IDLEST register address for I2CHS
 * modules.  No return value.
 */
static void omap2430_clk_i2chs_find_idlest(struct clk *clk,
					   void __iomem **idlest_reg,
					   u8 *idlest_bit,
					   u8 *idlest_val)
{
	*idlest_reg = OMAP_CM_REGADDR(CORE_MOD, CM_IDLEST);
	*idlest_bit = clk->enable_bit;
	*idlest_val = OMAP24XX_CM_IDLEST_VAL;
}

#else
#define omap2430_clk_i2chs_find_idlest	NULL
#endif

/* 2430 I2CHS has non-standard IDLEST register */
const struct clkops clkops_omap2430_i2chs_wait = {
	.enable		= omap2_dflt_clk_enable,
	.disable	= omap2_dflt_clk_disable,
	.find_idlest	= omap2430_clk_i2chs_find_idlest,
	.find_companion = omap2_clk_dflt_find_companion,
};

/*
 * Set clocks for bypass mode for reboot to work.
 */
void omap2xxx_clk_prepare_for_reboot(void)
{
	u32 rate;

	if (vclk == NULL || sclk == NULL)
		return;

	rate = clk_get_rate(sclk);
	clk_set_rate(vclk, rate);
}

/*
 * Switch the MPU rate if specified on cmdline.
 * We cannot do this early until cmdline is parsed.
 */
static int __init omap2xxx_clk_arch_init(void)
{
	struct clk *virt_prcm_set, *sys_ck, *dpll_ck, *mpu_ck;
	unsigned long sys_ck_rate;

	if (!cpu_is_omap24xx())
		return 0;

	if (!mpurate)
		return -EINVAL;

	virt_prcm_set = clk_get(NULL, "virt_prcm_set");
	sys_ck = clk_get(NULL, "sys_ck");
	dpll_ck = clk_get(NULL, "dpll_ck");
	mpu_ck = clk_get(NULL, "mpu_ck");

	if (clk_set_rate(virt_prcm_set, mpurate))
		printk(KERN_ERR "Could not find matching MPU rate\n");

	recalculate_root_clocks();

	sys_ck_rate = clk_get_rate(sys_ck);

	pr_info("Switched to new clocking rate (Crystal/DPLL/MPU): "
		"%ld.%01ld/%ld/%ld MHz\n",
		(sys_ck_rate / 1000000), (sys_ck_rate / 100000) % 10,
		(clk_get_rate(dpll_ck) / 1000000),
		(clk_get_rate(mpu_ck) / 1000000));

	return 0;
}
arch_initcall(omap2xxx_clk_arch_init);