aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-davinci/psc.c
blob: 82fdc69d5728c7e897851d1a7ccb91a22e06cb32 (plain) (blame)
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
126
127
128
129
130
131
132
133
134
135
136
137
/*
 * TI DaVinci Power and Sleep Controller (PSC)
 *
 * Copyright (C) 2006 Texas Instruments.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>

#include <mach/cputype.h>
#include <mach/psc.h>

#include "clock.h"

/* Return nonzero iff the domain's clock is active */
int __init davinci_psc_is_clk_active(unsigned int ctlr, unsigned int id)
{
	void __iomem *psc_base;
	u32 mdstat;
	struct davinci_soc_info *soc_info = &davinci_soc_info;

	if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
		pr_warn("PSC: Bad psc data: 0x%x[%d]\n",
				(int)soc_info->psc_bases, ctlr);
		return 0;
	}

	psc_base = ioremap(soc_info->psc_bases[ctlr], SZ_4K);
	mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
	iounmap(psc_base);

	/* if clocked, state can be "Enable" or "SyncReset" */
	return mdstat & BIT(12);
}

/* Control "reset" line associated with PSC domain */
void davinci_psc_reset(unsigned int ctlr, unsigned int id, bool reset)
{
	u32 mdctl;
	void __iomem *psc_base;
	struct davinci_soc_info *soc_info = &davinci_soc_info;

	if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
		pr_warn("PSC: Bad psc data: 0x%x[%d]\n",
				(int)soc_info->psc_bases, ctlr);
		return;
	}

	psc_base = ioremap(soc_info->psc_bases[ctlr], SZ_4K);

	mdctl = readl(psc_base + MDCTL + 4 * id);
	if (reset)
		mdctl &= ~MDCTL_LRST;
	else
		mdctl |= MDCTL_LRST;
	writel(mdctl, psc_base + MDCTL + 4 * id);

	iounmap(psc_base);
}

/* Enable or disable a PSC domain */
void davinci_psc_config(unsigned int domain, unsigned int ctlr,
		unsigned int id, bool enable, u32 flags)
{
	u32 epcpr, ptcmd, ptstat, pdstat, pdctl, mdstat, mdctl;
	void __iomem *psc_base;
	struct davinci_soc_info *soc_info = &davinci_soc_info;
	u32 next_state = PSC_STATE_ENABLE;

	if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
		pr_warn("PSC: Bad psc data: 0x%x[%d]\n",
				(int)soc_info->psc_bases, ctlr);
		return;
	}

	psc_base = ioremap(soc_info->psc_bases[ctlr], SZ_4K);

	if (!enable) {
		if (flags & PSC_SWRSTDISABLE)
			next_state = PSC_STATE_SWRSTDISABLE;
		else
			next_state = PSC_STATE_DISABLE;
	}

	mdctl = __raw_readl(psc_base + MDCTL + 4 * id);
	mdctl &= ~MDSTAT_STATE_MASK;
	mdctl |= next_state;
	if (flags & PSC_FORCE)
		mdctl |= MDCTL_FORCE;
	__raw_writel(mdctl, psc_base + MDCTL + 4 * id);

	pdstat = __raw_readl(psc_base + PDSTAT + 4 * domain);
	if ((pdstat & PDSTAT_STATE_MASK) == 0) {
		pdctl = __raw_readl(psc_base + PDCTL + 4 * domain);
		pdctl |= PDCTL_NEXT;
		__raw_writel(pdctl, psc_base + PDCTL + 4 * domain);

		ptcmd = 1 << domain;
		__raw_writel(ptcmd, psc_base + PTCMD);

		do {
			epcpr = __raw_readl(psc_base + EPCPR);
		} while ((((epcpr >> domain) & 1) == 0));

		pdctl = __raw_readl(psc_base + PDCTL + 4 * domain);
		pdctl |= PDCTL_EPCGOOD;
		__raw_writel(pdctl, psc_base + PDCTL + 4 * domain);
	} else {
		ptcmd = 1 << domain;
		__raw_writel(ptcmd, psc_base + PTCMD);
	}

	do {
		ptstat = __raw_readl(psc_base + PTSTAT);
	} while (!(((ptstat >> domain) & 1) == 0));

	do {
		mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
	} while (!((mdstat & MDSTAT_STATE_MASK) == next_state));

	iounmap(psc_base);
}