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>
78 lines
1.8 KiB
C
78 lines
1.8 KiB
C
/*
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* linux/arch/arm/mach-vexpress/platsmp.c
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*
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* Copyright (C) 2002 ARM Ltd.
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/smp.h>
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#include <linux/io.h>
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#include <asm/smp_scu.h>
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#include <asm/unified.h>
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#include <mach/ct-ca9x4.h>
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#include <mach/motherboard.h>
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#define V2M_PA_CS7 0x10000000
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#include "core.h"
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extern void versatile_secondary_startup(void);
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static void __iomem *scu_base_addr(void)
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{
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return MMIO_P2V(A9_MPCORE_SCU);
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}
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/*
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* Initialise the CPU possible map early - this describes the CPUs
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* which may be present or become present in the system.
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*/
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void __init smp_init_cpus(void)
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{
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void __iomem *scu_base = scu_base_addr();
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unsigned int i, ncores;
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ncores = scu_base ? scu_get_core_count(scu_base) : 1;
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/* sanity check */
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if (ncores > NR_CPUS) {
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printk(KERN_WARNING
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"vexpress: no. of cores (%d) greater than configured "
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"maximum of %d - clipping\n",
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ncores, NR_CPUS);
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ncores = NR_CPUS;
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}
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for (i = 0; i < ncores; i++)
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set_cpu_possible(i, true);
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}
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void __init platform_smp_prepare_cpus(unsigned int max_cpus)
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{
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int i;
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/*
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* Initialise the present map, which describes the set of CPUs
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* actually populated at the present time.
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*/
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for (i = 0; i < max_cpus; i++)
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set_cpu_present(i, true);
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scu_enable(scu_base_addr());
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/*
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* Write the address of secondary startup into the
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* system-wide flags register. The boot monitor waits
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* until it receives a soft interrupt, and then the
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* secondary CPU branches to this address.
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*/
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writel(~0, MMIO_P2V(V2M_SYS_FLAGSCLR));
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writel(BSYM(virt_to_phys(versatile_secondary_startup)),
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MMIO_P2V(V2M_SYS_FLAGSSET));
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}
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