2 * linux/arch/arm/mach-realview/platsmp.c
4 * Copyright (C) 2002 ARM Ltd.
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.
11 #include <linux/init.h>
12 #include <linux/errno.h>
13 #include <linux/smp.h>
16 #include <mach/hardware.h>
17 #include <asm/mach-types.h>
18 #include <asm/smp_scu.h>
19 #include <asm/unified.h>
21 #include <mach/board-eb.h>
22 #include <mach/board-pb11mp.h>
23 #include <mach/board-pbx.h>
27 extern void versatile_secondary_startup(void);
29 static void __iomem
*scu_base_addr(void)
31 if (machine_is_realview_eb_mp())
32 return __io_address(REALVIEW_EB11MP_SCU_BASE
);
33 else if (machine_is_realview_pb11mp())
34 return __io_address(REALVIEW_TC11MP_SCU_BASE
);
35 else if (machine_is_realview_pbx() &&
36 (core_tile_pbx11mp() || core_tile_pbxa9mp()))
37 return __io_address(REALVIEW_PBX_TILE_SCU_BASE
);
39 return (void __iomem
*)0;
43 * Initialise the CPU possible map early - this describes the CPUs
44 * which may be present or become present in the system.
46 void __init
smp_init_cpus(void)
48 void __iomem
*scu_base
= scu_base_addr();
49 unsigned int i
, ncores
;
51 ncores
= scu_base
? scu_get_core_count(scu_base
) : 1;
54 if (ncores
> NR_CPUS
) {
56 "Realview: no. of cores (%d) greater than configured "
57 "maximum of %d - clipping\n",
62 for (i
= 0; i
< ncores
; i
++)
63 set_cpu_possible(i
, true);
66 void __init
platform_smp_prepare_cpus(unsigned int max_cpus
)
71 * Initialise the present map, which describes the set of CPUs
72 * actually populated at the present time.
74 for (i
= 0; i
< max_cpus
; i
++)
75 set_cpu_present(i
, true);
77 scu_enable(scu_base_addr());
80 * Write the address of secondary startup into the
81 * system-wide flags register. The BootMonitor waits
82 * until it receives a soft interrupt, and then the
83 * secondary CPU branches to this address.
85 __raw_writel(BSYM(virt_to_phys(versatile_secondary_startup
)),
86 __io_address(REALVIEW_SYS_FLAGSSET
));