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/*
* OMAP2/3 CM module functions
*
* Copyright (C) 2009 Nokia Corporation
* Paul Walmsley
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/io.h>
#include <asm/atomic.h>
#include "cm.h"
#include "cm-regbits-24xx.h"
#include "cm-regbits-34xx.h"
/* MAX_MODULE_READY_TIME: max milliseconds for module to leave idle */
#define MAX_MODULE_READY_TIME 20000
static const u8 cm_idlest_offs[] = {
CM_IDLEST1, CM_IDLEST2, OMAP2430_CM_IDLEST3
};
/**
* omap2_cm_wait_idlest_ready - wait for a module to leave idle or standby
* @prcm_mod: PRCM module offset
* @idlest_id: CM_IDLESTx register ID (i.e., x = 1, 2, 3)
* @idlest_shift: shift of the bit in the CM_IDLEST* register to check
*
* XXX document
*/
int omap2_cm_wait_module_ready(s16 prcm_mod, u8 idlest_id, u8 idlest_shift)
{
int ena = 0, i = 0;
u8 cm_idlest_reg;
u32 mask;
if (!idlest_id || (idlest_id > ARRAY_SIZE(cm_idlest_offs)))
return -EINVAL;
cm_idlest_reg = cm_idlest_offs[idlest_id - 1];
if (cpu_is_omap24xx())
ena = idlest_shift;
else if (cpu_is_omap34xx())
ena = 0;
else
BUG();
mask = 1 << idlest_shift;
/* XXX should be OMAP2 CM */
while (((cm_read_mod_reg(prcm_mod, cm_idlest_reg) & mask) != ena) &&
(i++ < MAX_MODULE_READY_TIME))
udelay(1);
return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY;
}
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