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b2b135d980
Map the Global Control Registers (GCRs) provided by the MIPS Coherence Manager (CM) in preparation for using some of them in later patches. Signed-off-by: Paul Burton <paul.burton@imgtec.com>
46 lines
946 B
ArmAsm
46 lines
946 B
ArmAsm
/*
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* MIPS Coherence Manager (CM) Initialisation
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*
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* Copyright (c) 2016 Imagination Technologies Ltd.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <asm/addrspace.h>
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#include <asm/asm.h>
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#include <asm/cm.h>
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#include <asm/mipsregs.h>
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#include <asm/regdef.h>
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LEAF(mips_cm_map)
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/* Config3 must exist for a CM to be present */
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mfc0 t0, CP0_CONFIG, 1
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bgez t0, 2f
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mfc0 t0, CP0_CONFIG, 2
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bgez t0, 2f
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/* Check Config3.CMGCR to determine CM presence */
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mfc0 t0, CP0_CONFIG, 3
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and t0, t0, MIPS_CONF3_CMGCR
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beqz t0, 2f
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/* Find the current physical GCR base address */
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1: MFC0 t0, CP0_CMGCRBASE
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PTR_SLL t0, t0, 4
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/* If the GCRs are where we want, we're done */
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PTR_LI t1, CONFIG_MIPS_CM_BASE
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beq t0, t1, 2f
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/* Move the GCRs to our configured base address */
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PTR_LI t2, CKSEG1
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PTR_ADDU t0, t0, t2
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sw zero, GCR_BASE_UPPER(t0)
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sw t1, GCR_BASE(t0)
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/* Re-check the GCR base */
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b 1b
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2: jr ra
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END(mips_cm_map)
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