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From patchwork Fri Dec 8 09:42:19 2017
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Content-Type: text/plain; charset="utf-8"
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MIME-Version: 1.0
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Content-Transfer-Encoding: 7bit
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Subject: [v4,01/12] ARM: Add Krait L2 register accessor functions
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From: Sricharan R <sricharan@codeaurora.org>
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X-Patchwork-Id: 10102101
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Message-Id: <1512726150-7204-2-git-send-email-sricharan@codeaurora.org>
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To: mturquette@baylibre.com, sboyd@codeaurora.org,
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devicetree@vger.kernel.org, linux-pm@vger.kernel.org,
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linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
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viresh.kumar@linaro.org, linux-arm-kernel@lists.infradead.org
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Cc: sricharan@codeaurora.org, Mark Rutland <mark.rutland@arm.com>,
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Russell King <linux@arm.linux.org.uk>,
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Courtney Cavin <courtney.cavin@sonymobile.com>
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Date: Fri, 8 Dec 2017 15:12:19 +0530
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From: Stephen Boyd <sboyd@codeaurora.org>
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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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Cc: Courtney Cavin <courtney.cavin@sonymobile.com>
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Signed-off-by: Stephen Boyd <sboyd@codeaurora.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 | 58 +++++++++++++++++++++++++++++++
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arch/arm/include/asm/krait-l2-accessors.h | 20 +++++++++++
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4 files changed, 82 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 +1,58 @@
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+/*
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+ * Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
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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 and
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+ * only version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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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 +1,20 @@
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+/*
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+ * Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
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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 and
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+ * only version 2 as published by the Free Software Foundation.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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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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