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Commit 197e89e0 authored by Paul Burton's avatar Paul Burton Committed by Ralf Baechle
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MIPS: mips-cm: Implement mips_cm_revision 



Provide a function to trivially return the version of the CM present in
the system, or 0 if no CM is present. The mips_cm_revision() will be
used later on to determine the CM register width, so it must not use
the regular CM accessors to read the revision register since that will
lead to build failures due to recursive inlines.

Signed-off-by: default avatarPaul Burton <paul.burton@imgtec.com>
Signed-off-by: default avatarMarkos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/10655/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 5676319c

arch/mips/include/asm/mips-cm.h

+21 −0
Original line number Diff line number Diff line
@@ -189,6 +189,13 @@ BUILD_CM_Cx_R_(tcid_8_priority, 0x80) 
#define CM_GCR_REV_MINOR_SHF			0

#define CM_GCR_REV_MINOR_MSK			(_ULCAST_(0xff) << 0)



#define CM_ENCODE_REV(major, minor) \

		(((major) << CM_GCR_REV_MAJOR_SHF) | \

		 ((minor) << CM_GCR_REV_MINOR_SHF))



#define CM_REV_CM2				CM_ENCODE_REV(6, 0)

#define CM_REV_CM3				CM_ENCODE_REV(8, 0)



/* GCR_ERROR_CAUSE register fields */

#define CM_GCR_ERROR_CAUSE_ERRTYPE_SHF		27

#define CM_GCR_ERROR_CAUSE_ERRTYPE_MSK		(_ULCAST_(0x1f) << 27)
@@ -324,4 +331,18 @@ static inline int mips_cm_l2sync(void) 
	return 0;

}



/**

 * mips_cm_revision() - return CM revision

 *

 * Return: The revision of the CM, from GCR_REV, or 0 if no CM is present. The

 * return value should be checked against the CM_REV_* macros.

 */

static inline int mips_cm_revision(void)

{

	if (!mips_cm_present())

		return 0;



	return read_gcr_rev();

}



#endif /* __MIPS_ASM_MIPS_CM_H__ */