make smp code more similar to upstream

SVN-Revision: 27525

1 files changed, 46 insertions, 60 deletions

diff --git a/target/linux/cns3xxx/patches-3.0/049-cns3xxx_smp_support.patch b/target/linux/cns3xxx/patches-3.0/049-cns3xxx_smp_support.patch
index f629166075..df428caf74 100644
--- a/target/linux/cns3xxx/patches-3.0/049-cns3xxx_smp_support.patch
+++ b/target/linux/cns3xxx/patches-3.0/049-cns3xxx_smp_support.patch
@@ -9,14 +9,13 @@
 +obj-$(CONFIG_LOCAL_TIMERS)		+= localtimer.o
 --- /dev/null
 +++ b/arch/arm/mach-cns3xxx/headsmp.S
-@@ -0,0 +1,43 @@
+@@ -0,0 +1,42 @@
 +/*
 + *  linux/arch/arm/mach-cns3xxx/headsmp.S
 + *
-+ *  Copyright (c) 2003 ARM Limited
-+ *  Copyright 2011 Gateworks Corporation
-+ *		   Chris Lang <clang@gateworks.com
++ *  Cloned from linux/arch/arm/plat-versatile/headsmp.S
 + *
++ *  Copyright (c) 2003 ARM Limited
 + *  All Rights Reserved
 + *
 + * This program is free software; you can redistribute it and/or modify
@@ -29,9 +28,9 @@
 +	__INIT
 +
 +/*
-+ * CNS3XXX specific entry point for secondary CPUs.  This
-+ * provides a "holding pen" into which all secondary cores are held
-+ * until we're ready for them to initialise.
++ * CNS3XXX specific entry point for secondary CPUs.  This provides
++ * a "holding pen" into which all secondary cores are held until we're
++ * ready for them to initialise.
 + */
 +ENTRY(cns3xxx_secondary_startup)
 +	mrc	p15, 0, r0, c0, c0, 5
@@ -55,20 +54,19 @@
 +	.long	pen_release
 --- /dev/null
 +++ b/arch/arm/mach-cns3xxx/hotplug.c
-@@ -0,0 +1,131 @@
-+/*
-+ *  linux/arch/arm/mach-cns3xxx/hotplug.c
+@@ -0,0 +1,130 @@
++/* linux arch/arm/mach-cns3xxx/hotplug.c
 + *
-+ *  Copyright (C) 2002 ARM Ltd.
-+ *  Copyright 2011 Gateworks Corporation
-+ *		   Chris Lang <clang@gateworks.com>
++ *  Cloned from linux/arch/arm/mach-realview/hotplug.c
 + *
++ *  Copyright (C) 2002 ARM Ltd.
 + *  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 as
 + * published by the Free Software Foundation.
-+ */
++*/
++
 +#include <linux/kernel.h>
 +#include <linux/errno.h>
 +#include <linux/smp.h>
@@ -83,7 +81,7 @@
 +
 +	flush_cache_all();
 +	asm volatile(
-+		"mcr	p15, 0, %1, c7, c5, 0\n"
++	"	mcr	p15, 0, %1, c7, c5, 0\n"
 +	"	mcr	p15, 0, %1, c7, c10, 4\n"
 +	/*
 +	 * Turn off coherency
@@ -104,7 +102,7 @@
 +	unsigned int v;
 +
 +	asm volatile(
-+		"mrc	p15, 0, %0, c1, c0, 0\n"
++	"mrc	p15, 0, %0, c1, c0, 0\n"
 +	"	orr	%0, %0, %1\n"
 +	"	mcr	p15, 0, %0, c1, c0, 0\n"
 +	"	mrc	p15, 0, %0, c1, c0, 1\n"
@@ -189,52 +187,50 @@
 +}
 --- /dev/null
 +++ b/arch/arm/mach-cns3xxx/localtimer.c
-@@ -0,0 +1,29 @@
-+/*
-+ *  linux/arch/arm/mach-cns3xxx/localtimer.c
+@@ -0,0 +1,26 @@
++/* linux/arch/arm/mach-cns3xxx/localtimer.c
 + *
-+ *  Copyright (C) 2002 ARM Ltd.
-+ *  Copyright 2011 Gateworks Corporation
-+ *		   Chris Lang <clang@gateworks.com>
++ * Cloned from linux/arch/arm/mach-realview/localtimer.c
 + *
++ *  Copyright (C) 2002 ARM Ltd.
 + *  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 as
 + * published by the Free Software Foundation.
-+ */
-+#include <linux/init.h>
-+#include <linux/smp.h>
++*/
++
 +#include <linux/clockchips.h>
 +
-+#include <asm/smp_twd.h>
++#include <asm/irq.h>
 +#include <asm/localtimer.h>
-+#include <mach/irqs.h>
 +
 +/*
 + * Setup the local clock events for a CPU.
 + */
-+void __cpuinit local_timer_setup(struct clock_event_device *evt)
++int __cpuinit local_timer_setup(struct clock_event_device *evt)
 +{
 +	evt->irq = IRQ_LOCALTIMER;
 +	twd_timer_setup(evt);
++	return 0;
 +}
 --- /dev/null
 +++ b/arch/arm/mach-cns3xxx/platsmp.c
-@@ -0,0 +1,168 @@
-+/*
-+ *  linux/arch/arm/mach-cns3xxx/platsmp.c
+@@ -0,0 +1,175 @@
++/* linux/arch/arm/mach-cns3xxx/platsmp.c
 + *
-+ *  Copyright (C) 2002 ARM Ltd.
-+ *  Copyright 2011 Gateworks Corporation
++ * Copyright 2011 Gateworks Corporation
 + *		   Chris Lang <clang@gateworks.com>
++ * Cloned from linux/arch/arm/mach-vexpress/platsmp.c
 + *
++ *  Copyright (C) 2002 ARM Ltd.
 + *  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 as
 + * published by the Free Software Foundation.
-+ */
++*/
++
 +#include <linux/init.h>
 +#include <linux/errno.h>
 +#include <linux/delay.h>
@@ -244,19 +240,20 @@
 +#include <linux/io.h>
 +
 +#include <asm/cacheflush.h>
++#include <asm/hardware/gic.h>
 +#include <asm/smp_scu.h>
 +#include <asm/unified.h>
++
 +#include <mach/hardware.h>
 +#include <mach/cns3xxx.h>
 +
-+#include "core.h"
-+
 +extern void cns3xxx_secondary_startup(void);
 +
 +/*
 + * control for which core is the next to come out of the secondary
 + * boot "holding pen"
 + */
++
 +volatile int __cpuinitdata pen_release = -1;
 +
 +/*
@@ -264,7 +261,7 @@
 + * observers, irrespective of whether they're taking part in coherency
 + * or not.  This is necessary for the hotplug code to work reliably.
 + */
-+static void __cpuinit write_pen_release(int val)
++static void write_pen_release(int val)
 +{
 +	pen_release = val;
 +	smp_wmb();
@@ -312,10 +309,12 @@
 +	spin_lock(&boot_lock);
 +
 +	/*
-+	 * This is really belt and braces; we hold unintended secondary
-+	 * CPUs in the holding pen until we're ready for them.  However,
-+	 * since we haven't sent them a soft interrupt, they shouldn't
-+	 * be there.
++	 * The secondary processor is waiting to be released from
++	 * the holding pen - release it, then wait for it to flag
++	 * that it has been released by resetting pen_release.
++	 *
++	 * Note that "pen_release" is the hardware CPU ID, whereas
++	 * "cpu" is Linux's internal ID.
 +	 */
 +	write_pen_release(cpu);
 +
@@ -324,7 +323,7 @@
 +	 * the boot monitor to read the system wide flags register,
 +	 * and branch to the address found there.
 +	 */
-+	smp_cross_call(cpumask_of(cpu), 1);
++	gic_raise_softirq(cpumask_of(cpu), 1);
 +
 +	timeout = jiffies + (1 * HZ);
 +	while (time_before(jiffies, timeout)) {
@@ -348,6 +347,7 @@
 + * Initialise the CPU possible map early - this describes the CPUs
 + * which may be present or become present in the system.
 + */
++
 +void __init smp_init_cpus(void)
 +{
 +	void __iomem *scu_base = scu_base_addr();
@@ -366,6 +366,8 @@
 +
 +	for (i = 0; i < ncores; i++)
 +		set_cpu_possible(i, true);
++
++	set_smp_cross_call(gic_raise_softirq);
 +}
 +
 +void __init platform_smp_prepare_cpus(unsigned int max_cpus)
@@ -388,27 +390,11 @@
 +	 * secondary CPU branches to this address.
 +	 */
 +	__raw_writel(virt_to_phys(cns3xxx_secondary_startup),
-+			(void __iomem *)(0xFFF07000 + 0x0600));
-+}
---- /dev/null
-+++ b/arch/arm/mach-cns3xxx/include/mach/smp.h
-@@ -0,0 +1,13 @@
-+#ifndef __MACH_SMP_H
-+#define __MACH_SMP_H
-+
-+#include <asm/hardware/gic.h>
-+
-+/*
-+ * We use IRQ1 as the IPI
-+ */
-+static inline void smp_cross_call(const struct cpumask *mask, int ipi)
-+{
-+	gic_raise_softirq(mask, ipi);
++			(void __iomem *)(CNS3XXX_MISC_BASE_VIRT + 0x0600));
 +}
-+#endif
 --- a/arch/arm/Kconfig
 +++ b/arch/arm/Kconfig
-@@ -1311,7 +1311,7 @@ config SMP
+@@ -1312,7 +1312,7 @@ config SMP
  	depends on REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP || \
  		 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
  		 ARCH_EXYNOS4 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4 || \