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make smp code more similar to upstream

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SVN-Revision: 27525
This commit is contained in:
Imre Kaloz 2011-07-07 17:17:06 +00:00
parent 42df203852
commit 94055a90a7
1 changed files with 47 additions and 61 deletions
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102
target/linux/cns3xxx/patches-3.0/049-cns3xxx_smp_support.patch
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@ -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
+ *
+ * Cloned from linux/arch/arm/mach-realview/hotplug.c
+ *
+ * Copyright (C) 2002 ARM Ltd.
+ * Copyright 2011 Gateworks Corporation
+ * Chris Lang <clang@gateworks.com>
+ *
+ * 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
@ -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
+ *
+ * Cloned from linux/arch/arm/mach-realview/localtimer.c
+ *
+ * Copyright (C) 2002 ARM Ltd.
+ * Copyright 2011 Gateworks Corporation
+ * Chris Lang <clang@gateworks.com>
+ *
+ * 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
+ * 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));
+ (void __iomem *)(CNS3XXX_MISC_BASE_VIRT + 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);
+}
+#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 || \