linux-kernel - [PATCH V2 2/4] ARM: Xilinx: Adding local timer to support SMP

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Date:	Wed, 6 Apr 2011 11:15:08 -0600
From:	John Linn <john.linn@...inx.com>
To:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux@....linux.org.uk>,
	<catalin.marinas@....com>, <glikely@...retlab.ca>,
	<jamie@...ieiles.com>, <arnd@...db.de>, <nicolas.pitre@...aro.org>
CC:	John Linn <john.linn@...inx.com>
Subject: [PATCH V2 2/4] ARM: Xilinx: Adding local timer to support SMP

Each Cortex A9 CPU has a local timer in it and it can
be used during SMP mode.

Signed-off-by: John Linn <john.linn@...inx.com>
---

V2 Changes

These changes were broken out seperately in V2 at the request of Michal Simek.

Minor cleanup for the change from mach-xilinx to mach-zynq. The non-local 
timer change is no longer in the SMP patch as it was integrated into the 
non-SMP patches. 

 arch/arm/mach-zynq/Makefile                |    1 +
 arch/arm/mach-zynq/include/mach/irqs.h     |    1 +
 arch/arm/mach-zynq/include/mach/zynq_soc.h |    1 +
 arch/arm/mach-zynq/localtimer.c            |   39 ++++++++++++++++++++++++++++
 4 files changed, 42 insertions(+), 0 deletions(-)
 create mode 100644 arch/arm/mach-zynq/localtimer.c

diff --git a/arch/arm/mach-zynq/Makefile b/arch/arm/mach-zynq/Makefile
index 62787ff..9983a3f 100644
--- a/arch/arm/mach-zynq/Makefile
+++ b/arch/arm/mach-zynq/Makefile
@@ -5,3 +5,4 @@
 # Common support
 obj-y 				:= common.o timer.o
 obj-$(CONFIG_MACH_XILINX_EP107)	+= board_ep107.o
+obj-$(CONFIG_LOCAL_TIMERS)	+= localtimer.o
diff --git a/arch/arm/mach-zynq/include/mach/irqs.h b/arch/arm/mach-zynq/include/mach/irqs.h
index e7f414a..1f44780 100644
--- a/arch/arm/mach-zynq/include/mach/irqs.h
+++ b/arch/arm/mach-zynq/include/mach/irqs.h
@@ -22,6 +22,7 @@
  * GIC Interrupts
  */
 
+#define IRQ_SCU_CPU_TIMER	29
 #define IRQ_GIC_SPI_START	32
 #define IRQ_TIMERCOUNTER0	42
 #define IRQ_UART0		59
diff --git a/arch/arm/mach-zynq/include/mach/zynq_soc.h b/arch/arm/mach-zynq/include/mach/zynq_soc.h
index ff5349c..8768e57 100644
--- a/arch/arm/mach-zynq/include/mach/zynq_soc.h
+++ b/arch/arm/mach-zynq/include/mach/zynq_soc.h
@@ -42,6 +42,7 @@
 #define TTC0_BASE			IOMEM(TTC0_VIRT)
 #define SCU_PERIPH_BASE			IOMEM(SCU_PERIPH_VIRT)
 #define SCU_GIC_CPU_BASE		(SCU_PERIPH_BASE + 0x100)
+#define SCU_CPU_TIMER_BASE		(SCU_PERIPH_BASE + 0x600)
 #define SCU_GIC_DIST_BASE		(SCU_PERIPH_BASE + 0x1000)
 #define PL310_L2CC_BASE			IOMEM(PL310_L2CC_VIRT)
 #define OCM_LOW_BASE			IOMEM(OCM_LOW_VIRT)
diff --git a/arch/arm/mach-zynq/localtimer.c b/arch/arm/mach-zynq/localtimer.c
new file mode 100644
index 0000000..d627b06
--- /dev/null
+++ b/arch/arm/mach-zynq/localtimer.c
@@ -0,0 +1,39 @@
+/*
+ * arch/arm/mach-xilinx/localtimer.c
+ *
+ * Both cortex-a9 cores have their own timer in it's CPU domain.
+ *
+ * Copyright (C) 2011 Xilinx, Inc.
+ *
+ * This file is based on arch/arm/plat-versatile/localtimer.c
+ *
+ * Copyright (C) 2002 ARM Ltd.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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/init.h>
+#include <linux/clockchips.h>
+#include <asm/smp_twd.h>
+#include <asm/localtimer.h>
+#include <mach/zynq_soc.h>
+#include <mach/irqs.h>
+
+/*
+ * Setup the local clock events for a CPU.
+ */
+int __cpuinit local_timer_setup(struct clock_event_device *evt)
+{
+	twd_base = SCU_CPU_TIMER_BASE;
+
+	evt->irq = IRQ_SCU_CPU_TIMER;
+	twd_timer_setup(evt);
+	return 0;
+}
+
-- 
1.5.4.7



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