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Commit c33a605d authored by Vineet Gupta's avatar Vineet Gupta
Browse files

ARC: breakout aux handling into a separate header 



ARC timers use aux registers for programming and this paves way for
moving ARC timer drivers into drivers/clocksource

Signed-off-by: default avatarVineet Gupta <vgupta@synopsys.com>
parent 92b03314

arch/arc/include/asm/arcregs.h

+1 −84
Original line number Diff line number Diff line
@@ -112,90 +112,7 @@ 


#ifndef __ASSEMBLY__



/*

 ******************************************************************

 *      Inline ASM macros to read/write AUX Regs

 *      Essentially invocation of lr/sr insns from "C"

 */



#if 1



#define read_aux_reg(reg)	__builtin_arc_lr(reg)



/* gcc builtin sr needs reg param to be long immediate */

#define write_aux_reg(reg_immed, val)		\

		__builtin_arc_sr((unsigned int)(val), reg_immed)



#else



#define read_aux_reg(reg)		\

({					\

	unsigned int __ret;		\

	__asm__ __volatile__(		\

	"	lr    %0, [%1]"		\

	: "=r"(__ret)			\

	: "i"(reg));			\

	__ret;				\

})



/*

 * Aux Reg address is specified as long immediate by caller

 * e.g.

 *    write_aux_reg(0x69, some_val);

 * This generates tightest code.

 */

#define write_aux_reg(reg_imm, val)	\

({					\

	__asm__ __volatile__(		\

	"	sr   %0, [%1]	\n"	\

	:				\

	: "ir"(val), "i"(reg_imm));	\

})



/*

 * Aux Reg address is specified in a variable

 *  * e.g.

 *      reg_num = 0x69

 *      write_aux_reg2(reg_num, some_val);

 * This has to generate glue code to load the reg num from

 *  memory to a reg hence not recommended.

 */

#define write_aux_reg2(reg_in_var, val)		\

({						\

	unsigned int tmp;			\

						\

	__asm__ __volatile__(			\

	"	ld   %0, [%2]	\n\t"		\

	"	sr   %1, [%0]	\n\t"		\

	: "=&r"(tmp)				\

	: "r"(val), "memory"(&reg_in_var));	\

})



#endif



#define READ_BCR(reg, into)				\

{							\

	unsigned int tmp;				\

	tmp = read_aux_reg(reg);			\

	if (sizeof(tmp) == sizeof(into)) {		\

		into = *((typeof(into) *)&tmp);		\

	} else {					\

		extern void bogus_undefined(void);	\

		bogus_undefined();			\

	}						\

}



#define WRITE_AUX(reg, into)				\

{							\

	unsigned int tmp;				\

	if (sizeof(tmp) == sizeof(into)) {		\

		tmp = (*(unsigned int *)&(into));	\

		write_aux_reg(reg, tmp);		\

	} else  {					\

		extern void bogus_undefined(void);	\

		bogus_undefined();			\

	}						\

}

#include <soc/arc/aux.h>



/* Helpers */

#define TO_KB(bytes)		((bytes) >> 10)

arch/arc/include/asm/mcip.h

+1 −1
Original line number Diff line number Diff line
@@ -13,7 +13,7 @@ 


#ifdef CONFIG_ISA_ARCV2



#include <asm/arcregs.h>

#include <soc/arc/aux.h>



#define ARC_REG_MCIP_BCR	0x0d0

#define ARC_REG_MCIP_CMD	0x600

include/soc/arc/aux.h

0 → 100644
+63 −0
Original line number Diff line number Diff line 
/*

 * Copyright (C) 2016-2017 Synopsys, Inc. (www.synopsys.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.

 *

 */



#ifndef __SOC_ARC_AUX_H__

#define __SOC_ARC_AUX_H__



#ifdef CONFIG_ARC



#define read_aux_reg(r)		__builtin_arc_lr(r)



/* gcc builtin sr needs reg param to be long immediate */

#define write_aux_reg(r, v)	__builtin_arc_sr((unsigned int)(v), r)



#else	/* !CONFIG_ARC */



static inline int read_aux_reg(u32 r)

{

	return 0;

}



/*

 * function helps elide unused variable warning

 * see: http://lists.infradead.org/pipermail/linux-snps-arc/2016-November/001748.html

 */

static inline void write_aux_reg(u32 r, u32 v)

{

	;

}



#endif



#define READ_BCR(reg, into)				\

{							\

	unsigned int tmp;				\

	tmp = read_aux_reg(reg);			\

	if (sizeof(tmp) == sizeof(into)) {		\

		into = *((typeof(into) *)&tmp);		\

	} else {					\

		extern void bogus_undefined(void);	\

		bogus_undefined();			\

	}						\

}



#define WRITE_AUX(reg, into)				\

{							\

	unsigned int tmp;				\

	if (sizeof(tmp) == sizeof(into)) {		\

		tmp = (*(unsigned int *)&(into));	\

		write_aux_reg(reg, tmp);		\

	} else  {					\

		extern void bogus_undefined(void);	\

		bogus_undefined();			\

	}						\

}





#endif