62 lines
1.7 KiB
C
62 lines
1.7 KiB
C
/*
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* OMAP4 CM module functions
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*
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* Copyright (C) 2009 Nokia Corporation
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* Paul Walmsley
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <asm/atomic.h>
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#include <plat/common.h>
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#include "cm.h"
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#include "cm-regbits-44xx.h"
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/**
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* omap4_cm_wait_module_ready - wait for a module to be in 'func' state
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* @clkctrl_reg: CLKCTRL module address
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*
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* Wait for the module IDLEST to be functional. If the idle state is in any
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* the non functional state (trans, idle or disabled), module and thus the
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* sysconfig cannot be accessed and will probably lead to an "imprecise
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* external abort"
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*
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* Module idle state:
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* 0x0 func: Module is fully functional, including OCP
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* 0x1 trans: Module is performing transition: wakeup, or sleep, or sleep
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* abortion
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* 0x2 idle: Module is in Idle mode (only OCP part). It is functional if
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* using separate functional clock
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* 0x3 disabled: Module is disabled and cannot be accessed
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*
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* TODO: Need to handle module accessible in idle state
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*/
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int omap4_cm_wait_module_ready(void __iomem *clkctrl_reg)
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{
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int i = 0;
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if (!clkctrl_reg)
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return 0;
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omap_test_timeout(((__raw_readl(clkctrl_reg) &
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OMAP4430_IDLEST_MASK) == 0),
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MAX_MODULE_READY_TIME, i);
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return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
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}
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