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21325b25f4
There are several CM operations which behave similarly across OMAP2+ SoCs, but which have slight differences in their underlying implementations. This patch creates the support code for this function pointer registration process. No function pointers are included yet, but a subsequent patch will create these for the module IDLEST registers. This patch allows other code to use CM-provided data and operations without needing to know which SoC is currently in use. A further description of the concept is provided in the patch entitled "ARM: OMAP2+: PRM: prepare for use of prm_ll_data function pointers". Signed-off-by: Paul Walmsley <paul@pwsan.com>
72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/*
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* OMAP2+ common Clock Management (CM) IP block functions
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*
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* Copyright (C) 2012 Texas Instruments, Inc.
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* Paul Walmsley <paul@pwsan.com>
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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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* XXX This code should eventually be moved to a CM driver.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include "cm2xxx.h"
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#include "cm3xxx.h"
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#include "cm44xx.h"
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/*
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* cm_ll_data: function pointers to SoC-specific implementations of
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* common CM functions
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*/
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static struct cm_ll_data null_cm_ll_data;
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static struct cm_ll_data *cm_ll_data = &null_cm_ll_data;
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/**
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* cm_register - register per-SoC low-level data with the CM
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* @cld: low-level per-SoC OMAP CM data & function pointers to register
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*
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* Register per-SoC low-level OMAP CM data and function pointers with
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* the OMAP CM common interface. The caller must keep the data
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* pointed to by @cld valid until it calls cm_unregister() and
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* it returns successfully. Returns 0 upon success, -EINVAL if @cld
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* is NULL, or -EEXIST if cm_register() has already been called
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* without an intervening cm_unregister().
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*/
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int cm_register(struct cm_ll_data *cld)
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{
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if (!cld)
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return -EINVAL;
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if (cm_ll_data != &null_cm_ll_data)
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return -EEXIST;
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cm_ll_data = cld;
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return 0;
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}
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/**
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* cm_unregister - unregister per-SoC low-level data & function pointers
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* @cld: low-level per-SoC OMAP CM data & function pointers to unregister
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*
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* Unregister per-SoC low-level OMAP CM data and function pointers
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* that were previously registered with cm_register(). The
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* caller may not destroy any of the data pointed to by @cld until
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* this function returns successfully. Returns 0 upon success, or
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* -EINVAL if @cld is NULL or if @cld does not match the struct
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* cm_ll_data * previously registered by cm_register().
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*/
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int cm_unregister(struct cm_ll_data *cld)
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{
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if (!cld || cm_ll_data != cld)
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return -EINVAL;
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cm_ll_data = &null_cm_ll_data;
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return 0;
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}
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