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Commit 21325b25 authored by Paul Walmsley's avatar Paul Walmsley
Browse files

ARM: OMAP2+: CM: prepare for use of cm_ll_data function pointers 



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: default avatarPaul Walmsley <paul@pwsan.com>
parent e24c3573

arch/arm/mach-omap2/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -93,7 +93,7 @@ obj-$(CONFIG_ARCH_OMAP4) += cpuidle44xx.o 
endif



# PRCM

obj-y					+= prcm.o prm_common.o

obj-y					+= prcm.o prm_common.o cm_common.o

obj-$(CONFIG_ARCH_OMAP2)		+= prm2xxx_3xxx.o prm2xxx.o cm2xxx.o

obj-$(CONFIG_ARCH_OMAP3)		+= prm2xxx_3xxx.o prm3xxx.o cm3xxx.o

obj-$(CONFIG_ARCH_OMAP3)		+= vc3xxx_data.o vp3xxx_data.o

arch/arm/mach-omap2/cm.h

+12 −0
Original line number Diff line number Diff line
@@ -33,4 +33,16 @@ 
 */

#define MAX_MODULE_DISABLE_TIME		5000



# ifndef __ASSEMBLER__



/**

 * struct cm_ll_data - fn ptrs to per-SoC CM function implementations

 */

struct cm_ll_data {};



extern int cm_register(struct cm_ll_data *cld);

extern int cm_unregister(struct cm_ll_data *cld);



# endif



#endif

arch/arm/mach-omap2/cm_common.c

0 → 100644
+71 −0
Original line number Diff line number Diff line 
/*

 * 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;

}