forked from mirrors/linux
d41418c0c0
Add the required code to properly handle race free platform coherency exit to the DCSCB power down method. The power_up_setup callback is used to enable the CCI interface for the cluster being brought up. This must be done in assembly before the kernel environment is entered. Thanks to Achin Gupta and Nicolas Pitre for their help and contributions. Signed-off-by: Dave Martin <dave.martin@linaro.org> Signed-off-by: Nicolas Pitre <nico@linaro.org> Reviewed-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Acked-by: Pawel Moll <pawel.moll@arm.com>
38 lines
1,016 B
ArmAsm
38 lines
1,016 B
ArmAsm
/*
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* arch/arm/include/asm/dcscb_setup.S
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*
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* Created by: Dave Martin, 2012-06-22
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* Copyright: (C) 2012-2013 Linaro Limited
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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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#include <linux/linkage.h>
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ENTRY(dcscb_power_up_setup)
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cmp r0, #0 @ check affinity level
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beq 2f
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/*
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* Enable cluster-level coherency, in preparation for turning on the MMU.
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* The ACTLR SMP bit does not need to be set here, because cpu_resume()
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* already restores that.
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*
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* A15/A7 may not require explicit L2 invalidation on reset, dependent
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* on hardware integration decisions.
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* For now, this code assumes that L2 is either already invalidated,
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* or invalidation is not required.
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*/
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b cci_enable_port_for_self
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2: @ Implementation-specific local CPU setup operations should go here,
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@ if any. In this case, there is nothing to do.
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bx lr
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ENDPROC(dcscb_power_up_setup)
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