+++ /dev/null
-Content-Type: text/plain; charset="utf-8"
-MIME-Version: 1.0
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-Subject: [v3,01/13] ARM: Add Krait L2 register accessor functions
-From: Stephen Boyd <sboyd@codeaurora.org>
-X-Patchwork-Id: 6063051
-Message-Id: <1426920332-9340-2-git-send-email-sboyd@codeaurora.org>
-To: Mike Turquette <mturquette@linaro.org>, Stephen Boyd <sboyd@codeaurora.org>
-Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org,
- linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
- Viresh Kumar <viresh.kumar@linaro.org>,
- Mark Rutland <mark.rutland@arm.com>, Russell King <linux@arm.linux.org.uk>,
- Courtney Cavin <courtney.cavin@sonymobile.com>
-Date: Fri, 20 Mar 2015 23:45:20 -0700
-
-Krait CPUs have a handful of L2 cache controller registers that
-live behind a cp15 based indirection register. First you program
-the indirection register (l2cpselr) to point the L2 'window'
-register (l2cpdr) at what you want to read/write. Then you
-read/write the 'window' register to do what you want. The
-l2cpselr register is not banked per-cpu so we must lock around
-accesses to it to prevent other CPUs from re-pointing l2cpdr
-underneath us.
-
-Cc: Mark Rutland <mark.rutland@arm.com>
-Cc: Russell King <linux@arm.linux.org.uk>
-Cc: Courtney Cavin <courtney.cavin@sonymobile.com>
-Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
-
----
-arch/arm/common/Kconfig | 3 ++
- arch/arm/common/Makefile | 1 +
- arch/arm/common/krait-l2-accessors.c | 58 +++++++++++++++++++++++++++++++
- arch/arm/include/asm/krait-l2-accessors.h | 20 +++++++++++
- 4 files changed, 82 insertions(+)
- create mode 100644 arch/arm/common/krait-l2-accessors.c
- create mode 100644 arch/arm/include/asm/krait-l2-accessors.h
-
---- a/arch/arm/common/Kconfig
-+++ b/arch/arm/common/Kconfig
-@@ -9,6 +9,9 @@ config DMABOUNCE
- bool
- select ZONE_DMA
-
-+config KRAIT_L2_ACCESSORS
-+ bool
-+
- config SHARP_LOCOMO
- bool
-
---- a/arch/arm/common/Makefile
-+++ b/arch/arm/common/Makefile
-@@ -7,6 +7,7 @@ obj-y += firmware.o
- obj-$(CONFIG_ICST) += icst.o
- obj-$(CONFIG_SA1111) += sa1111.o
- obj-$(CONFIG_DMABOUNCE) += dmabounce.o
-+obj-$(CONFIG_KRAIT_L2_ACCESSORS) += krait-l2-accessors.o
- obj-$(CONFIG_SHARP_LOCOMO) += locomo.o
- obj-$(CONFIG_SHARP_PARAM) += sharpsl_param.o
- obj-$(CONFIG_SHARP_SCOOP) += scoop.o
---- /dev/null
-+++ b/arch/arm/common/krait-l2-accessors.c
-@@ -0,0 +1,58 @@
-+/*
-+ * Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
-+ *
-+ * This program is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License version 2 and
-+ * only version 2 as published by the Free Software Foundation.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ */
-+
-+#include <linux/spinlock.h>
-+#include <linux/export.h>
-+
-+#include <asm/barrier.h>
-+#include <asm/krait-l2-accessors.h>
-+
-+static DEFINE_RAW_SPINLOCK(krait_l2_lock);
-+
-+void krait_set_l2_indirect_reg(u32 addr, u32 val)
-+{
-+ unsigned long flags;
-+
-+ raw_spin_lock_irqsave(&krait_l2_lock, flags);
-+ /*
-+ * Select the L2 window by poking l2cpselr, then write to the window
-+ * via l2cpdr.
-+ */
-+ asm volatile ("mcr p15, 3, %0, c15, c0, 6 @ l2cpselr" : : "r" (addr));
-+ isb();
-+ asm volatile ("mcr p15, 3, %0, c15, c0, 7 @ l2cpdr" : : "r" (val));
-+ isb();
-+
-+ raw_spin_unlock_irqrestore(&krait_l2_lock, flags);
-+}
-+EXPORT_SYMBOL(krait_set_l2_indirect_reg);
-+
-+u32 krait_get_l2_indirect_reg(u32 addr)
-+{
-+ u32 val;
-+ unsigned long flags;
-+
-+ raw_spin_lock_irqsave(&krait_l2_lock, flags);
-+ /*
-+ * Select the L2 window by poking l2cpselr, then read from the window
-+ * via l2cpdr.
-+ */
-+ asm volatile ("mcr p15, 3, %0, c15, c0, 6 @ l2cpselr" : : "r" (addr));
-+ isb();
-+ asm volatile ("mrc p15, 3, %0, c15, c0, 7 @ l2cpdr" : "=r" (val));
-+
-+ raw_spin_unlock_irqrestore(&krait_l2_lock, flags);
-+
-+ return val;
-+}
-+EXPORT_SYMBOL(krait_get_l2_indirect_reg);
---- /dev/null
-+++ b/arch/arm/include/asm/krait-l2-accessors.h
-@@ -0,0 +1,20 @@
-+/*
-+ * Copyright (c) 2011-2013, The Linux Foundation. All rights reserved.
-+ *
-+ * This program is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License version 2 and
-+ * only version 2 as published by the Free Software Foundation.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-+ * GNU General Public License for more details.
-+ */
-+
-+#ifndef __ASMARM_KRAIT_L2_ACCESSORS_H
-+#define __ASMARM_KRAIT_L2_ACCESSORS_H
-+
-+extern void krait_set_l2_indirect_reg(u32 addr, u32 val);
-+extern u32 krait_get_l2_indirect_reg(u32 addr);
-+
-+#endif
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