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116 lines
3.5 KiB
Diff
116 lines
3.5 KiB
Diff
From 36d68f64c411e09788687d5919886aadeb92adca Mon Sep 17 00:00:00 2001
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From: Stephen Boyd <sboyd@codeaurora.org>
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Date: Tue, 14 Aug 2018 17:42:20 +0530
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Subject: [PATCH 01/12] ARM: Add Krait L2 register accessor functions
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Krait CPUs have a handful of L2 cache controller registers that
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live behind a cp15 based indirection register. First you program
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the indirection register (l2cpselr) to point the L2 'window'
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register (l2cpdr) at what you want to read/write. Then you
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read/write the 'window' register to do what you want. The
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l2cpselr register is not banked per-cpu so we must lock around
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accesses to it to prevent other CPUs from re-pointing l2cpdr
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underneath us.
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Cc: Mark Rutland <mark.rutland@arm.com>
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Cc: Russell King <linux@arm.linux.org.uk>
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Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
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Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
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Signed-off-by: Sricharan R <sricharan@codeaurora.org>
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Tested-by: Craig Tatlor <ctatlor97@gmail.com>
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Signed-off-by: Stephen Boyd <sboyd@kernel.org>
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---
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arch/arm/common/Kconfig | 3 ++
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arch/arm/common/Makefile | 1 +
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arch/arm/common/krait-l2-accessors.c | 48 +++++++++++++++++++++++
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arch/arm/include/asm/krait-l2-accessors.h | 9 +++++
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4 files changed, 61 insertions(+)
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create mode 100644 arch/arm/common/krait-l2-accessors.c
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create mode 100644 arch/arm/include/asm/krait-l2-accessors.h
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--- a/arch/arm/common/Kconfig
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+++ b/arch/arm/common/Kconfig
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@@ -7,6 +7,9 @@ config DMABOUNCE
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bool
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select ZONE_DMA
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+config KRAIT_L2_ACCESSORS
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+ bool
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+
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config SHARP_LOCOMO
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bool
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--- a/arch/arm/common/Makefile
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+++ b/arch/arm/common/Makefile
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@@ -7,6 +7,7 @@ obj-y += firmware.o
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obj-$(CONFIG_SA1111) += sa1111.o
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obj-$(CONFIG_DMABOUNCE) += dmabounce.o
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+obj-$(CONFIG_KRAIT_L2_ACCESSORS) += krait-l2-accessors.o
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obj-$(CONFIG_SHARP_LOCOMO) += locomo.o
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obj-$(CONFIG_SHARP_PARAM) += sharpsl_param.o
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obj-$(CONFIG_SHARP_SCOOP) += scoop.o
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--- /dev/null
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+++ b/arch/arm/common/krait-l2-accessors.c
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@@ -0,0 +1,48 @@
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+// SPDX-License-Identifier: GPL-2.0
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+// Copyright (c) 2018, The Linux Foundation. All rights reserved.
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+
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+#include <linux/spinlock.h>
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+#include <linux/export.h>
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+
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+#include <asm/barrier.h>
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+#include <asm/krait-l2-accessors.h>
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+
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+static DEFINE_RAW_SPINLOCK(krait_l2_lock);
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+ raw_spin_unlock_irqrestore(&krait_l2_lock, flags);
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+
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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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--- /dev/null
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+++ b/arch/arm/include/asm/krait-l2-accessors.h
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@@ -0,0 +1,9 @@
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+/* SPDX-License-Identifier: GPL-2.0 */
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+
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+#ifndef __ASMARM_KRAIT_L2_ACCESSORS_H
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+#define __ASMARM_KRAIT_L2_ACCESSORS_H
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+
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+extern void krait_set_l2_indirect_reg(u32 addr, u32 val);
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+extern u32 krait_get_l2_indirect_reg(u32 addr);
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+
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+#endif
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