From: Sricharan R <sricharan@codeaurora.org>
To: mark.rutland@arm.com, robh@kernel.org, sudeep.holla@arm.com,
linux@arm.linux.org.uk, ctatlor97@gmail.com, rjw@rjwysocki.net,
viresh.kumar@linaro.org, mturquette@baylibre.com,
linux-pm@vger.kernel.org, sboyd@codeaurora.org,
linux@armlinux.org.uk, thierry.escande@linaro.org,
linux-kernel@vger.kernel.org, david.brown@linaro.org,
devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org,
andy.gross@linaro.org, linux-soc@vger.kernel.org,
linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
niklas.cassel@linaro.org
Cc: sricharan@codeaurora.org
Subject: [PATCH v12 01/14] ARM: Add Krait L2 register accessor functions
Date: Tue, 14 Aug 2018 17:42:20 +0530 [thread overview]
Message-ID: <1534248753-2440-2-git-send-email-sricharan@codeaurora.org> (raw)
In-Reply-To: <1534248753-2440-1-git-send-email-sricharan@codeaurora.org>
From: Stephen Boyd <sboyd@codeaurora.org>
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>
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
---
arch/arm/common/Kconfig | 3 ++
arch/arm/common/Makefile | 1 +
arch/arm/common/krait-l2-accessors.c | 48 +++++++++++++++++++++++++++++++
arch/arm/include/asm/krait-l2-accessors.h | 9 ++++++
4 files changed, 61 insertions(+)
create mode 100644 arch/arm/common/krait-l2-accessors.c
create mode 100644 arch/arm/include/asm/krait-l2-accessors.h
diff --git a/arch/arm/common/Kconfig b/arch/arm/common/Kconfig
index e5ad070..c8e1986 100644
--- a/arch/arm/common/Kconfig
+++ b/arch/arm/common/Kconfig
@@ -7,6 +7,9 @@ config DMABOUNCE
bool
select ZONE_DMA
+config KRAIT_L2_ACCESSORS
+ bool
+
config SHARP_LOCOMO
bool
diff --git a/arch/arm/common/Makefile b/arch/arm/common/Makefile
index 3157be4..219a260 100644
--- a/arch/arm/common/Makefile
+++ b/arch/arm/common/Makefile
@@ -7,6 +7,7 @@ obj-y += firmware.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
diff --git a/arch/arm/common/krait-l2-accessors.c b/arch/arm/common/krait-l2-accessors.c
new file mode 100644
index 0000000..9a97dda
--- /dev/null
+++ b/arch/arm/common/krait-l2-accessors.c
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018, The Linux Foundation. All rights reserved.
+
+#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);
diff --git a/arch/arm/include/asm/krait-l2-accessors.h b/arch/arm/include/asm/krait-l2-accessors.h
new file mode 100644
index 0000000..a5f2cdd
--- /dev/null
+++ b/arch/arm/include/asm/krait-l2-accessors.h
@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#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
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation
next prev parent reply other threads:[~2018-08-14 12:13 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-14 12:12 [PATCH V12 00/14] Krait clocks + Krait CPUfreq Sricharan R
2018-08-14 12:12 ` Sricharan R [this message]
2018-08-14 12:12 ` [PATCH v12 02/14] clk: qcom: Add support for High-Frequency PLLs (HFPLLs) Sricharan R
2018-08-14 12:12 ` [PATCH v12 03/14] clk: qcom: Add HFPLL driver Sricharan R
2018-08-14 12:12 ` [PATCH v12 04/14] dt-bindings: clock: Document qcom,hfpll Sricharan R
2018-08-14 12:12 ` [PATCH v12 05/14] clk: qcom: Add MSM8960/APQ8064's HFPLLs Sricharan R
2018-08-14 12:12 ` [PATCH v12 06/14] clk: qcom: Add IPQ806X's HFPLLs Sricharan R
2018-08-14 12:12 ` [PATCH v12 07/14] clk: qcom: Add support for Krait clocks Sricharan R
2018-08-14 12:12 ` [PATCH v12 08/14] clk: qcom: Add KPSS ACC/GCC driver Sricharan R
2018-08-14 12:12 ` [PATCH v12 09/14] dt-bindings: arm: Document qcom,kpss-gcc Sricharan R
2018-08-14 12:12 ` [PATCH v12 10/14] clk: qcom: Add Krait clock controller driver Sricharan R
2018-08-14 12:12 ` [PATCH v12 11/14] dt-bindings: clock: Document qcom,krait-cc Sricharan R
2018-08-14 12:12 ` [PATCH v12 12/14] clk: qcom: Add safe switch hook for krait mux clocks Sricharan R
2018-08-14 12:12 ` [PATCH v12 13/14] cpufreq: qcom: Re-organise kryo cpufreq to use it for other nvmem based qcom socs Sricharan R
2018-08-17 15:09 ` Rob Herring
2018-08-20 12:45 ` Sricharan R
2018-08-14 12:12 ` [PATCH v12 14/14] cpufreq: qcom: Add support for krait based socs Sricharan R
2018-08-17 15:09 ` Rob Herring
2018-08-24 15:21 ` Niklas Cassel
2018-08-24 19:15 ` Niklas Cassel
2018-08-14 12:20 ` [PATCH V12 00/14] Krait clocks + Krait CPUfreq Sricharan R
2018-09-07 9:57 ` Sricharan R
2018-09-07 14:28 ` Craig Tatlor
2018-09-19 20:24 ` Craig
2018-09-20 13:01 ` Sricharan R
2018-09-20 14:27 ` Craig
2018-09-20 13:03 ` Sricharan R
2018-10-17 15:44 ` Stephen Boyd
2018-10-17 20:16 ` Stephen Boyd
2018-10-22 4:09 ` Sricharan R
2018-10-22 15:30 ` Niklas Cassel
2018-10-24 4:11 ` Sricharan R
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1534248753-2440-2-git-send-email-sricharan@codeaurora.org \
--to=sricharan@codeaurora.org \
--cc=andy.gross@linaro.org \
--cc=ctatlor97@gmail.com \
--cc=david.brown@linaro.org \
--cc=devicetree@vger.kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-clk@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pm@vger.kernel.org \
--cc=linux-soc@vger.kernel.org \
--cc=linux@arm.linux.org.uk \
--cc=linux@armlinux.org.uk \
--cc=mark.rutland@arm.com \
--cc=mturquette@baylibre.com \
--cc=niklas.cassel@linaro.org \
--cc=rjw@rjwysocki.net \
--cc=robh@kernel.org \
--cc=sboyd@codeaurora.org \
--cc=sudeep.holla@arm.com \
--cc=thierry.escande@linaro.org \
--cc=viresh.kumar@linaro.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).