1 /*
2  *  linux/arch/arm/mach-vexpress/platsmp.c
3  *
4  *  Copyright (C) 2002 ARM Ltd.
5  *  All Rights Reserved
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License version 2 as
9  * published by the Free Software Foundation.
10  */
11 #include <linux/init.h>
12 #include <linux/errno.h>
13 #include <linux/smp.h>
14 #include <linux/io.h>
15 
16 #include <mach/motherboard.h>
17 #define V2M_PA_CS7 0x10000000
18 
19 #include "core.h"
20 
21 extern void versatile_secondary_startup(void);
22 
23 /*
24  * Initialise the CPU possible map early - this describes the CPUs
25  * which may be present or become present in the system.
26  */
smp_init_cpus(void)27 void __init smp_init_cpus(void)
28 {
29 	ct_desc->init_cpu_map();
30 }
31 
platform_smp_prepare_cpus(unsigned int max_cpus)32 void __init platform_smp_prepare_cpus(unsigned int max_cpus)
33 {
34 	/*
35 	 * Initialise the present map, which describes the set of CPUs
36 	 * actually populated at the present time.
37 	 */
38 	ct_desc->smp_enable(max_cpus);
39 
40 	/*
41 	 * Write the address of secondary startup into the
42 	 * system-wide flags register. The boot monitor waits
43 	 * until it receives a soft interrupt, and then the
44 	 * secondary CPU branches to this address.
45 	 */
46 	writel(~0, MMIO_P2V(V2M_SYS_FLAGSCLR));
47 	writel(virt_to_phys(versatile_secondary_startup),
48 		MMIO_P2V(V2M_SYS_FLAGSSET));
49 }
50