[PATCH 6/8] ARM: ux500: Switch to generic SCU routines

Anton Vorontsov
2010-11-30T17:17:09Z

This shrinks platform-specific code quite a bit.

Signed-off-by: Anton Vorontsov <avorontsov@mvista.com>
---
arch/arm/mach-ux500/Makefile | 2 +-
arch/arm/mach-ux500/headsmp.S | 38 -----------
arch/arm/mach-ux500/hotplug.c | 5 +-
arch/arm/mach-ux500/include/mach/smp.h | 3 -
arch/arm/mach-ux500/platsmp.c | 115 ++------------------------------
5 files changed, 10 insertions(+), 153 deletions(-)
delete mode 100644 arch/arm/mach-ux500/headsmp.S

diff --git a/arch/arm/mach-ux500/Makefile b/arch/arm/mach-ux500/Makefile
index 9e27a84..90fa03c 100644
--- a/arch/arm/mach-ux500/Makefile
+++ b/arch/arm/mach-ux500/Makefile
@@ -7,7 +7,7 @@ obj-$(CONFIG_UX500_SOC_DB5500) += cpu-db5500.o devices-db5500.o
obj-$(CONFIG_UX500_SOC_DB8500) += cpu-db8500.o devices-db8500.o prcmu.o
obj-$(CONFIG_MACH_U8500_MOP) += board-mop500.o board-mop500-sdi.o
obj-$(CONFIG_MACH_U5500) += board-u5500.o
-obj-$(CONFIG_SMP) += platsmp.o headsmp.o
+obj-$(CONFIG_SMP) += platsmp.o
obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
obj-$(CONFIG_LOCAL_TIMERS) += localtimer.o
obj-$(CONFIG_REGULATOR_AB8500) += board-mop500-regulators.o
diff --git a/arch/arm/mach-ux500/headsmp.S b/arch/arm/mach-ux500/headsmp.S
deleted file mode 100644
index a6be2cd..0000000
--- a/arch/arm/mach-ux500/headsmp.S
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- * Copyright (c) 2009 ST-Ericsson
- * This file is based ARM Realview platform
- * 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>
-
- __INIT
-
-/*
- * U8500 specific entry point for secondary CPUs.
- */
-ENTRY(u8500_secondary_startup)
- mrc p15, 0, r0, c0, c0, 5
- and r0, r0, #15
- adr r4, 1f
- ldmia r4, {r5, r6}
- sub r4, r4, r5
- add r6, r6, r4
- dsb
-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
-
-1: .long .
- .long pen_release
diff --git a/arch/arm/mach-ux500/hotplug.c b/arch/arm/mach-ux500/hotplug.c
index dd8037e..38f4e1b 100644
--- a/arch/arm/mach-ux500/hotplug.c
+++ b/arch/arm/mach-ux500/hotplug.c
@@ -12,10 +12,9 @@
#include <linux/errno.h>
#include <linux/smp.h>

+#include <asm/smp_scu.h>
#include <asm/cacheflush.h>

-extern volatile int pen_release;
-
static inline void platform_do_lowpower(unsigned int cpu)
{
flush_cache_all();
@@ -24,7 +23,7 @@ static inline void platform_do_lowpower(unsigned int cpu)
for (;;) {
__asm__ __volatile__("dsb\n\t" "wfi\n\t"
: : : "memory");
- if (pen_release == cpu) {
+ if (scu_pen_release == cpu) {
/*
* OK, proper wakeup, we're done
*/
diff --git a/arch/arm/mach-ux500/include/mach/smp.h b/arch/arm/mach-ux500/include/mach/smp.h
index bd57c50..646cea7 100644
--- a/arch/arm/mach-ux500/include/mach/smp.h
+++ b/arch/arm/mach-ux500/include/mach/smp.h
@@ -12,9 +12,6 @@
#include <asm/hardware/gic.h>
#include <asm/smp_mpidr.h>

-/* This is required to wakeup the secondary core */
-extern void u8500_secondary_startup(void);
-
/*
* We use IRQ1 as the IPI
*/
diff --git a/arch/arm/mach-ux500/platsmp.c b/arch/arm/mach-ux500/platsmp.c
index b8987bd..0e195a2 100644
--- a/arch/arm/mach-ux500/platsmp.c
+++ b/arch/arm/mach-ux500/platsmp.c
@@ -11,30 +11,12 @@
* published by the Free Software Foundation.
*/
#include <linux/init.h>
-#include <linux/errno.h>
-#include <linux/delay.h>
-#include <linux/device.h>
#include <linux/smp.h>
#include <linux/io.h>

-#include <asm/cacheflush.h>
-#include <asm/localtimer.h>
#include <asm/smp_scu.h>
#include <mach/hardware.h>

-/*
- * control for which core is the next to come out of the secondary
- * boot "holding pen"
- */
-volatile int __cpuinitdata pen_release = -1;
-
-static unsigned int __init get_core_count(void)
-{
- return scu_get_core_count(__io_address(UX500_SCU_BASE));
-}
-
-static DEFINE_SPINLOCK(boot_lock);
-
void __cpuinit platform_secondary_init(unsigned int cpu)
{
trace_hardirqs_off();
@@ -46,59 +28,18 @@ void __cpuinit platform_secondary_init(unsigned int cpu)
*/
gic_cpu_init(0, __io_address(UX500_GIC_CPU_BASE));

- /*
- * let the primary processor know we're out of the
- * pen, then head off into the C entry point
- */
- pen_release = -1;
-
- /*
- * Synchronise with the boot thread.
- */
- spin_lock(&boot_lock);
- spin_unlock(&boot_lock);
+ scu_secondary_init(cpu);
}

int __cpuinit 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);
-
- /*
- * 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.
- */
- pen_release = cpu;
- __cpuc_flush_dcache_area((void *)&pen_release, sizeof(pen_release));
- outer_clean_range(__pa(&pen_release), __pa(&pen_release) + 1);
-
- smp_cross_call(cpumask_of(cpu), 1);
-
- timeout = jiffies + (1 * HZ);
- while (time_before(jiffies, timeout)) {
- if (pen_release == -1)
- break;
- }
-
- /*
- * 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;
+ return scu_boot_secondary(cpu, idle);
}

static void __init wakeup_secondary(void)
{
/* nobody is to be released from the pen yet */
- pen_release = -1;
+ scu_pen_release = -1;

/*
* write the address of secondary startup into the backup ram register
@@ -107,7 +48,7 @@ static void __init wakeup_secondary(void)
* is waiting for. This would wake up the secondary core from WFE
*/
#define U8500_CPU1_JUMPADDR_OFFSET 0x1FF4
- __raw_writel(virt_to_phys(u8500_secondary_startup),
+ __raw_writel(virt_to_phys(scu_secondary_startup),
__io_address(UX500_BACKUPRAM0_BASE) +
U8500_CPU1_JUMPADDR_OFFSET);

@@ -126,55 +67,13 @@ static void __init wakeup_secondary(void)
*/
void __init smp_init_cpus(void)
{
- unsigned int i, ncores = get_core_count();
-
- for (i = 0; i < ncores; i++)
- set_cpu_possible(i, true);
+ scu_init_cpus(__io_address(UX500_SCU_BASE));
}

void __init smp_prepare_cpus(unsigned int max_cpus)
{
- unsigned int ncores = get_core_count();
- unsigned int cpu = smp_processor_id();
- int i;
-
- /* sanity check */
- if (ncores == 0) {
- printk(KERN_ERR
- "U8500: strange CM count of 0? Default to 1\n");
- ncores = 1;
- }
-
- if (ncores > num_possible_cpus()) {
- printk(KERN_WARNING
- "U8500: no. of cores (%d) greater than configured "
- "maximum of %d - clipping\n",
- ncores, num_possible_cpus());
- ncores = num_possible_cpus();
- }
-
- smp_store_cpu_info(cpu);
-
- /*
- * are we trying to boot more cores than exist?
- */
- if (max_cpus > ncores)
- max_cpus = ncores;
-
- /*
- * Initialise the present map, which describes the set of CPUs
- * actually populated at the present time.
- */
- for (i = 0; i < max_cpus; i++)
- set_cpu_present(i, true);
+ scu_prepare_cpus(__io_address(UX500_SCU_BASE), max_cpus);

- if (max_cpus > 1) {
- /*
- * Enable the local timer or broadcast device for the
- * boot CPU, but only if we have more than one CPU.
- */
- percpu_timer_setup();
- scu_enable(__io_address(UX500_SCU_BASE));
+ if (max_cpus > 1)
wakeup_secondary();
- }
}
--
1.7.0.5