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From: Soren Brinkmann <soren.brinkmann@xilinx.com>
To: Michal Simek <michal.simek@xilinx.com>,
	Russell King <linux@arm.linux.org.uk>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Daniel Lezcano <daniel.lezcano@linaro.org>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>
Cc: "Sören Brinkmann" <soren.brinkmann@xilinx.com>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	linux-pm@vger.kernel.org, "Pawel Moll" <pawel.moll@arm.com>,
	"Ian Campbell" <ijc+devicetree@hellion.org.uk>,
	"Kumar Gala" <galak@codeaurora.org>
Subject: [PATCH 5/9] ARM: zynq: Remove invalidate cache for cpu die
Date: Wed, 20 Aug 2014 13:41:51 -0700	[thread overview]
Message-ID: <1408567315-28479-6-git-send-email-soren.brinkmann@xilinx.com> (raw)
In-Reply-To: <1408567315-28479-1-git-send-email-soren.brinkmann@xilinx.com>

From: Daniel Lezcano <daniel.lezcano@linaro.org>

As there is no Power management unit on this board, it is not possible to power
down a core, just WFI is allowed. There is no point to invalidate the cache and
exit coherency.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-and-tested-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
---
 arch/arm/mach-zynq/hotplug.c | 32 +-------------------------------
 1 file changed, 1 insertion(+), 31 deletions(-)

diff --git a/arch/arm/mach-zynq/hotplug.c b/arch/arm/mach-zynq/hotplug.c
index 5052c70326e4..366f46c91365 100644
--- a/arch/arm/mach-zynq/hotplug.c
+++ b/arch/arm/mach-zynq/hotplug.c
@@ -10,35 +10,7 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/smp.h>
-
-#include <asm/cacheflush.h>
-#include <asm/cp15.h>
-#include "common.h"
-
-static inline void zynq_cpu_enter_lowpower(void)
-{
-	unsigned int v;
-
-	flush_cache_all();
-	asm volatile(
-	"	mcr	p15, 0, %1, c7, c5, 0\n"
-	"	dsb\n"
-	/*
-	 * Turn off coherency
-	 */
-	"	mrc	p15, 0, %0, c1, c0, 1\n"
-	"	bic	%0, %0, #0x40\n"
-	"	mcr	p15, 0, %0, c1, c0, 1\n"
-	"	mrc	p15, 0, %0, c1, c0, 0\n"
-	"	bic	%0, %0, %2\n"
-	"	mcr	p15, 0, %0, c1, c0, 0\n"
-	  : "=&r" (v)
-	  : "r" (0), "Ir" (CR_C)
-	  : "cc");
-}
+#include <asm/proc-fns.h>
 
 /*
  * platform-specific code to shutdown a CPU
@@ -47,8 +19,6 @@ static inline void zynq_cpu_enter_lowpower(void)
  */
 void zynq_platform_cpu_die(unsigned int cpu)
 {
-	zynq_cpu_enter_lowpower();
-
 	/*
 	 * there is no power-control hardware on this platform, so all
 	 * we can do is put the core into WFI; this is safe as the calling
-- 
2.0.1.1.gfbfc394


WARNING: multiple messages have this Message-ID (diff)
From: soren.brinkmann@xilinx.com (Soren Brinkmann)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 5/9] ARM: zynq: Remove invalidate cache for cpu die
Date: Wed, 20 Aug 2014 13:41:51 -0700	[thread overview]
Message-ID: <1408567315-28479-6-git-send-email-soren.brinkmann@xilinx.com> (raw)
In-Reply-To: <1408567315-28479-1-git-send-email-soren.brinkmann@xilinx.com>

From: Daniel Lezcano <daniel.lezcano@linaro.org>

As there is no Power management unit on this board, it is not possible to power
down a core, just WFI is allowed. There is no point to invalidate the cache and
exit coherency.

Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-and-tested-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
---
 arch/arm/mach-zynq/hotplug.c | 32 +-------------------------------
 1 file changed, 1 insertion(+), 31 deletions(-)

diff --git a/arch/arm/mach-zynq/hotplug.c b/arch/arm/mach-zynq/hotplug.c
index 5052c70326e4..366f46c91365 100644
--- a/arch/arm/mach-zynq/hotplug.c
+++ b/arch/arm/mach-zynq/hotplug.c
@@ -10,35 +10,7 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/smp.h>
-
-#include <asm/cacheflush.h>
-#include <asm/cp15.h>
-#include "common.h"
-
-static inline void zynq_cpu_enter_lowpower(void)
-{
-	unsigned int v;
-
-	flush_cache_all();
-	asm volatile(
-	"	mcr	p15, 0, %1, c7, c5, 0\n"
-	"	dsb\n"
-	/*
-	 * Turn off coherency
-	 */
-	"	mrc	p15, 0, %0, c1, c0, 1\n"
-	"	bic	%0, %0, #0x40\n"
-	"	mcr	p15, 0, %0, c1, c0, 1\n"
-	"	mrc	p15, 0, %0, c1, c0, 0\n"
-	"	bic	%0, %0, %2\n"
-	"	mcr	p15, 0, %0, c1, c0, 0\n"
-	  : "=&r" (v)
-	  : "r" (0), "Ir" (CR_C)
-	  : "cc");
-}
+#include <asm/proc-fns.h>
 
 /*
  * platform-specific code to shutdown a CPU
@@ -47,8 +19,6 @@ static inline void zynq_cpu_enter_lowpower(void)
  */
 void zynq_platform_cpu_die(unsigned int cpu)
 {
-	zynq_cpu_enter_lowpower();
-
 	/*
 	 * there is no power-control hardware on this platform, so all
 	 * we can do is put the core into WFI; this is safe as the calling
-- 
2.0.1.1.gfbfc394

  parent reply	other threads:[~2014-08-20 20:42 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-08-20 20:41 [PATCH 0/9] Zynq PM updates Soren Brinkmann
2014-08-20 20:41 ` Soren Brinkmann
2014-08-20 20:41 ` [PATCH 1/9] ARM: zynq: PM: Enable A9 internal clock gating feature Soren Brinkmann
2014-08-20 20:41   ` Soren Brinkmann
2014-08-20 20:41   ` Soren Brinkmann
2014-08-21 12:19   ` Michal Simek
2014-08-21 12:19     ` Michal Simek
2014-08-21 12:19     ` Michal Simek
2014-08-21 17:20     ` Sören Brinkmann
2014-08-21 17:20       ` Sören Brinkmann
2014-08-21 17:20       ` Sören Brinkmann
2014-08-20 20:41 ` [PATCH 2/9] Documentation: devicetree: Add binding for Synopsys DDR controller Soren Brinkmann
2014-08-20 20:41   ` Soren Brinkmann
2014-08-20 20:41   ` Soren Brinkmann
2014-08-20 20:41 ` [PATCH 3/9] ARM: zynq: DT: Add DDRC node Soren Brinkmann
2014-08-20 20:41   ` Soren Brinkmann
2014-08-20 20:41 ` [PATCH 4/9] ARM: zynq: PM: Enable DDR self-refresh and clock stop Soren Brinkmann
2014-08-20 20:41   ` Soren Brinkmann
2014-08-20 20:41   ` Soren Brinkmann
2014-08-21 12:25   ` Michal Simek
2014-08-21 12:25     ` Michal Simek
2014-08-21 12:25     ` Michal Simek
2014-08-21 18:59     ` Sören Brinkmann
2014-08-21 18:59       ` Sören Brinkmann
2014-08-21 18:59       ` Sören Brinkmann
2014-08-20 20:41 ` Soren Brinkmann [this message]
2014-08-20 20:41   ` [PATCH 5/9] ARM: zynq: Remove invalidate cache for cpu die Soren Brinkmann
2014-08-20 20:41 ` [PATCH 6/9] ARM: zynq: cpuidle: Remove pointless code Soren Brinkmann
2014-08-20 20:41   ` Soren Brinkmann
2014-08-20 20:41   ` Soren Brinkmann
2014-08-20 20:41 ` [PATCH 7/9] ARM: zynq: Synchronise zynq_cpu_die/kill Soren Brinkmann
2014-08-20 20:41   ` Soren Brinkmann
2014-08-20 20:41 ` [PATCH 8/9] ARM: zynq: Remove hotplug.c Soren Brinkmann
2014-08-20 20:41   ` Soren Brinkmann
2014-08-21  1:32   ` Daniel Lezcano
2014-08-21  1:32     ` Daniel Lezcano
2014-08-21 23:38     ` Sören Brinkmann
2014-08-21 23:38       ` Sören Brinkmann
2014-08-21 23:38       ` Sören Brinkmann
2014-08-20 20:41 ` [PATCH 9/9] ARM: zynq: Rename 'zynq_platform_cpu_die' Soren Brinkmann
2014-08-20 20:41   ` Soren Brinkmann
2014-08-21 12:28   ` Michal Simek
2014-08-21 12:28     ` Michal Simek
2014-08-21 12:28     ` Michal Simek
2014-08-21 19:02     ` Sören Brinkmann
2014-08-21 19:02       ` Sören Brinkmann
2014-08-21 19:02       ` Sören Brinkmann
2014-08-22  5:52       ` Michal Simek
2014-08-22  5:52         ` Michal Simek

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