forked from luck/tmp_suning_uos_patched
0462b4477e
Realview and Versatile Express share the same SMP bringup code, so consolidate the two implementations. Acked-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/*
|
|
* 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/smp.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/smp_scu.h>
|
|
#include <asm/unified.h>
|
|
|
|
#include <mach/ct-ca9x4.h>
|
|
#include <mach/motherboard.h>
|
|
#define V2M_PA_CS7 0x10000000
|
|
|
|
#include "core.h"
|
|
|
|
extern void versatile_secondary_startup(void);
|
|
|
|
static void __iomem *scu_base_addr(void)
|
|
{
|
|
return MMIO_P2V(A9_MPCORE_SCU);
|
|
}
|
|
|
|
/*
|
|
* 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();
|
|
unsigned int i, ncores;
|
|
|
|
ncores = scu_base ? scu_get_core_count(scu_base) : 1;
|
|
|
|
/* sanity check */
|
|
if (ncores > NR_CPUS) {
|
|
printk(KERN_WARNING
|
|
"vexpress: no. of cores (%d) greater than configured "
|
|
"maximum of %d - clipping\n",
|
|
ncores, NR_CPUS);
|
|
ncores = NR_CPUS;
|
|
}
|
|
|
|
for (i = 0; i < ncores; i++)
|
|
set_cpu_possible(i, true);
|
|
}
|
|
|
|
void __init platform_smp_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
int i;
|
|
|
|
/*
|
|
* 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_enable(scu_base_addr());
|
|
|
|
/*
|
|
* Write the address of secondary startup into the
|
|
* system-wide flags register. The boot monitor waits
|
|
* until it receives a soft interrupt, and then the
|
|
* secondary CPU branches to this address.
|
|
*/
|
|
writel(~0, MMIO_P2V(V2M_SYS_FLAGSCLR));
|
|
writel(BSYM(virt_to_phys(versatile_secondary_startup)),
|
|
MMIO_P2V(V2M_SYS_FLAGSSET));
|
|
}
|