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/*
* OMAP2+ common Clock Management (CM) IP block functions
*
* Copyright (C) 2012 Texas Instruments, Inc.
* Paul Walmsley <paul@pwsan.com>
*
* 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.
*
* XXX This code should eventually be moved to a CM driver.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include "cm2xxx.h"
#include "cm3xxx.h"
#include "cm44xx.h"
/*
* cm_ll_data: function pointers to SoC-specific implementations of
* common CM functions
*/
static struct cm_ll_data null_cm_ll_data;
static struct cm_ll_data *cm_ll_data = &null_cm_ll_data;
/**
* cm_register - register per-SoC low-level data with the CM
* @cld: low-level per-SoC OMAP CM data & function pointers to register
*
* Register per-SoC low-level OMAP CM data and function pointers with
* the OMAP CM common interface. The caller must keep the data
* pointed to by @cld valid until it calls cm_unregister() and
* it returns successfully. Returns 0 upon success, -EINVAL if @cld
* is NULL, or -EEXIST if cm_register() has already been called
* without an intervening cm_unregister().
*/
int cm_register(struct cm_ll_data *cld)
{
if (!cld)
return -EINVAL;
if (cm_ll_data != &null_cm_ll_data)
return -EEXIST;
cm_ll_data = cld;
return 0;
}
/**
* cm_unregister - unregister per-SoC low-level data & function pointers
* @cld: low-level per-SoC OMAP CM data & function pointers to unregister
*
* Unregister per-SoC low-level OMAP CM data and function pointers
* that were previously registered with cm_register(). The
* caller may not destroy any of the data pointed to by @cld until
* this function returns successfully. Returns 0 upon success, or
* -EINVAL if @cld is NULL or if @cld does not match the struct
* cm_ll_data * previously registered by cm_register().
*/
int cm_unregister(struct cm_ll_data *cld)
{
if (!cld || cm_ll_data != cld)
return -EINVAL;
cm_ll_data = &null_cm_ll_data;
return 0;
}
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