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Message-Id: <1396041180-29897-6-git-send-email-elder@linaro.org>
Date: Fri, 28 Mar 2014 16:12:58 -0500
From: Alex Elder <elder@...aro.org>
To: linux@....linux.org.uk, linus.walleij@...aro.org,
viresh.linux@...il.com, shiraz.hashim@...il.com,
catalin.marinas@....com
Cc: spear-devel@...t.st.com, linux-arm-kernel@...ts.infradead.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 5/7] ARM: versatile: kill off SMP support code
The two users of the SMP support code under arch/arm/mach-versatile
are now using common code. So a bunch of stuff under mach-versatile
can just go away.
Signed-off-by: Alex Elder <elder@...aro.org>
---
arch/arm/mach-vexpress/v2m.c | 1 -
arch/arm/plat-versatile/Makefile | 1 -
arch/arm/plat-versatile/headsmp.S | 41 -----------
arch/arm/plat-versatile/include/plat/platsmp.h | 14 ----
arch/arm/plat-versatile/platsmp.c | 91 ------------------------
5 files changed, 148 deletions(-)
delete mode 100644 arch/arm/plat-versatile/headsmp.S
delete mode 100644 arch/arm/plat-versatile/include/plat/platsmp.h
delete mode 100644 arch/arm/plat-versatile/platsmp.c
diff --git a/arch/arm/mach-vexpress/v2m.c b/arch/arm/mach-vexpress/v2m.c
index 4f8b8cb..c2dc99b 100644
--- a/arch/arm/mach-vexpress/v2m.c
+++ b/arch/arm/mach-vexpress/v2m.c
@@ -35,7 +35,6 @@
#include <mach/motherboard.h>
#include <plat/sched_clock.h>
-#include <plat/platsmp.h>
#include "core.h"
diff --git a/arch/arm/plat-versatile/Makefile b/arch/arm/plat-versatile/Makefile
index f88d448..d71d1b4 100644
--- a/arch/arm/plat-versatile/Makefile
+++ b/arch/arm/plat-versatile/Makefile
@@ -4,4 +4,3 @@ obj-$(CONFIG_PLAT_VERSATILE_CLOCK) += clock.o
obj-$(CONFIG_PLAT_VERSATILE_CLCD) += clcd.o
obj-$(CONFIG_PLAT_VERSATILE_LEDS) += leds.o
obj-$(CONFIG_PLAT_VERSATILE_SCHED_CLOCK) += sched-clock.o
-obj-$(CONFIG_SMP) += headsmp.o platsmp.o
diff --git a/arch/arm/plat-versatile/headsmp.S b/arch/arm/plat-versatile/headsmp.S
deleted file mode 100644
index 40f27e5..0000000
--- a/arch/arm/plat-versatile/headsmp.S
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * 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
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#include <linux/linkage.h>
-#include <linux/init.h>
-#include <asm/assembler.h>
-
-/*
- * Realview/Versatile Express 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(versatile_secondary_startup)
- ARM_BE8(setend be)
- mrc p15, 0, r0, c0, c0, 5
- bic r0, #0xff000000
- adr r4, 1f
- ldmia r4, {r5, r6}
- sub r4, r4, r5
- add r6, r6, r4
-pen: ldr r7, [r6]
- cmp r7, r0
- bne pen
-
- /*
- * we've been released from the holding pen: secondary_stack
- * should now contain the SVC stack for this core
- */
- b secondary_startup
-
- .align
-1: .long .
- .long pen_release
-ENDPROC(versatile_secondary_startup)
diff --git a/arch/arm/plat-versatile/include/plat/platsmp.h b/arch/arm/plat-versatile/include/plat/platsmp.h
deleted file mode 100644
index 50fb830..0000000
--- a/arch/arm/plat-versatile/include/plat/platsmp.h
+++ /dev/null
@@ -1,14 +0,0 @@
-/*
- * linux/arch/arm/plat-versatile/include/plat/platsmp.h
- *
- * Copyright (C) 2011 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.
- */
-
-extern void versatile_secondary_startup(void);
-extern void versatile_secondary_init(unsigned int cpu);
-extern int versatile_boot_secondary(unsigned int cpu, struct task_struct *idle);
diff --git a/arch/arm/plat-versatile/platsmp.c b/arch/arm/plat-versatile/platsmp.c
deleted file mode 100644
index 53feb90..0000000
--- a/arch/arm/plat-versatile/platsmp.c
+++ /dev/null
@@ -1,91 +0,0 @@
-/*
- * linux/arch/arm/plat-versatile/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>
-#include <linux/device.h>
-#include <linux/jiffies.h>
-#include <linux/smp.h>
-
-#include <asm/cacheflush.h>
-#include <asm/smp_plat.h>
-
-/*
- * Write pen_release in a way that is guaranteed to be visible to all
- * observers, irrespective of whether they're taking part in coherency
- * or not. This is necessary for the hotplug code to work reliably.
- */
-static void write_pen_release(int val)
-{
- pen_release = val;
- smp_wmb();
- sync_cache_w(&pen_release);
-}
-
-static DEFINE_SPINLOCK(boot_lock);
-
-void versatile_secondary_init(unsigned int cpu)
-{
- /*
- * let the primary processor know we're out of the
- * pen, then head off into the C entry point
- */
- write_pen_release(-1);
-
- /*
- * Synchronise with the boot thread.
- */
- spin_lock(&boot_lock);
- spin_unlock(&boot_lock);
-}
-
-int versatile_boot_secondary(unsigned int cpu, struct task_struct *idle)
-{
- unsigned long timeout;
-
- /*
- * Set synchronisation state between this boot processor
- * and the secondary one
- */
- 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.
- */
- write_pen_release(cpu_logical_map(cpu));
-
- /*
- * Send the secondary CPU a soft interrupt, thereby causing
- * the boot monitor to read the system wide flags register,
- * and branch to the address found there.
- */
- arch_send_wakeup_ipi_mask(cpumask_of(cpu));
-
- timeout = jiffies + (1 * HZ);
- while (time_before(jiffies, timeout)) {
- smp_rmb();
- if (pen_release == -1)
- break;
-
- udelay(10);
- }
-
- /*
- * now the secondary core is starting up let it run its
- * calibrations, then wait for it to finish
- */
- spin_unlock(&boot_lock);
-
- return pen_release != -1 ? -ENOSYS : 0;
-}
--
1.7.9.5
--
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