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Paul Walmsley71348bc2009-09-03 20:14:02 +03001/*
2 * OMAP4 CM module functions
3 *
4 * Copyright (C) 2009 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/module.h>
14#include <linux/types.h>
15#include <linux/delay.h>
16#include <linux/spinlock.h>
17#include <linux/list.h>
18#include <linux/errno.h>
19#include <linux/err.h>
20#include <linux/io.h>
21
22#include <asm/atomic.h>
23
Benoit Cousson9a23dfe2010-05-20 12:31:08 -060024#include <plat/common.h>
25
Paul Walmsley71348bc2009-09-03 20:14:02 +030026#include "cm.h"
Benoit Coussond9e66252010-05-20 12:31:08 -060027#include "cm-regbits-44xx.h"
Paul Walmsley71348bc2009-09-03 20:14:02 +030028
29/**
Benoit Cousson9a23dfe2010-05-20 12:31:08 -060030 * omap4_cm_wait_module_ready - wait for a module to be in 'func' state
31 * @clkctrl_reg: CLKCTRL module address
Paul Walmsley71348bc2009-09-03 20:14:02 +030032 *
Benoit Cousson9a23dfe2010-05-20 12:31:08 -060033 * Wait for the module IDLEST to be functional. If the idle state is in any
34 * the non functional state (trans, idle or disabled), module and thus the
35 * sysconfig cannot be accessed and will probably lead to an "imprecise
36 * external abort"
37 *
38 * Module idle state:
39 * 0x0 func: Module is fully functional, including OCP
40 * 0x1 trans: Module is performing transition: wakeup, or sleep, or sleep
41 * abortion
42 * 0x2 idle: Module is in Idle mode (only OCP part). It is functional if
43 * using separate functional clock
44 * 0x3 disabled: Module is disabled and cannot be accessed
45 *
46 * TODO: Need to handle module accessible in idle state
Paul Walmsley71348bc2009-09-03 20:14:02 +030047 */
Benoit Cousson9a23dfe2010-05-20 12:31:08 -060048int omap4_cm_wait_module_ready(void __iomem *clkctrl_reg)
Paul Walmsley71348bc2009-09-03 20:14:02 +030049{
Benoit Cousson9a23dfe2010-05-20 12:31:08 -060050 int i = 0;
51
52 if (!clkctrl_reg)
53 return 0;
54
55 omap_test_timeout(((__raw_readl(clkctrl_reg) &
56 OMAP4430_IDLEST_MASK) == 0),
57 MAX_MODULE_READY_TIME, i);
58
59 return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
Paul Walmsley71348bc2009-09-03 20:14:02 +030060}
61