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48 lines
1.2 KiB
48 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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// Copyright (c) 2018, The Linux Foundation. All rights reserved. |
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#include <linux/spinlock.h> |
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#include <linux/export.h> |
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#include <asm/barrier.h> |
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#include <asm/krait-l2-accessors.h> |
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static DEFINE_RAW_SPINLOCK(krait_l2_lock); |
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void krait_set_l2_indirect_reg(u32 addr, u32 val) |
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{ |
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unsigned long flags; |
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raw_spin_lock_irqsave(&krait_l2_lock, flags); |
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/* |
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* Select the L2 window by poking l2cpselr, then write to the window |
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* via l2cpdr. |
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*/ |
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asm volatile ("mcr p15, 3, %0, c15, c0, 6 @ l2cpselr" : : "r" (addr)); |
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isb(); |
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asm volatile ("mcr p15, 3, %0, c15, c0, 7 @ l2cpdr" : : "r" (val)); |
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isb(); |
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raw_spin_unlock_irqrestore(&krait_l2_lock, flags); |
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} |
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EXPORT_SYMBOL(krait_set_l2_indirect_reg); |
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u32 krait_get_l2_indirect_reg(u32 addr) |
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{ |
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u32 val; |
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unsigned long flags; |
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raw_spin_lock_irqsave(&krait_l2_lock, flags); |
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/* |
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* Select the L2 window by poking l2cpselr, then read from the window |
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* via l2cpdr. |
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*/ |
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asm volatile ("mcr p15, 3, %0, c15, c0, 6 @ l2cpselr" : : "r" (addr)); |
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isb(); |
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asm volatile ("mrc p15, 3, %0, c15, c0, 7 @ l2cpdr" : "=r" (val)); |
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raw_spin_unlock_irqrestore(&krait_l2_lock, flags); |
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return val; |
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} |
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EXPORT_SYMBOL(krait_get_l2_indirect_reg);
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