1/*
2 *  linux/arch/arm/mach-realview/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/hardware.h>
17#include <asm/mach-types.h>
18#include <asm/smp_scu.h>
19
20#include <mach/board-eb.h>
21#include <mach/board-pb11mp.h>
22#include <mach/board-pbx.h>
23
24#include <plat/platsmp.h>
25
26#include "core.h"
27
28static void __iomem *scu_base_addr(void)
29{
30	if (machine_is_realview_eb_mp())
31		return __io_address(REALVIEW_EB11MP_SCU_BASE);
32	else if (machine_is_realview_pb11mp())
33		return __io_address(REALVIEW_TC11MP_SCU_BASE);
34	else if (machine_is_realview_pbx() &&
35		 (core_tile_pbx11mp() || core_tile_pbxa9mp()))
36		return __io_address(REALVIEW_PBX_TILE_SCU_BASE);
37	else
38		return (void __iomem *)0;
39}
40
41/*
42 * Initialise the CPU possible map early - this describes the CPUs
43 * which may be present or become present in the system.
44 */
45static void __init realview_smp_init_cpus(void)
46{
47	void __iomem *scu_base = scu_base_addr();
48	unsigned int i, ncores;
49
50	ncores = scu_base ? scu_get_core_count(scu_base) : 1;
51
52	/* sanity check */
53	if (ncores > nr_cpu_ids) {
54		pr_warn("SMP: %u cores greater than maximum (%u), clipping\n",
55			ncores, nr_cpu_ids);
56		ncores = nr_cpu_ids;
57	}
58
59	for (i = 0; i < ncores; i++)
60		set_cpu_possible(i, true);
61}
62
63static void __init realview_smp_prepare_cpus(unsigned int max_cpus)
64{
65
66	scu_enable(scu_base_addr());
67
68	/*
69	 * Write the address of secondary startup into the
70	 * system-wide flags register. The BootMonitor waits
71	 * until it receives a soft interrupt, and then the
72	 * secondary CPU branches to this address.
73	 */
74	__raw_writel(virt_to_phys(versatile_secondary_startup),
75		     __io_address(REALVIEW_SYS_FLAGSSET));
76}
77
78struct smp_operations realview_smp_ops __initdata = {
79	.smp_init_cpus		= realview_smp_init_cpus,
80	.smp_prepare_cpus	= realview_smp_prepare_cpus,
81	.smp_secondary_init	= versatile_secondary_init,
82	.smp_boot_secondary	= versatile_boot_secondary,
83#ifdef CONFIG_HOTPLUG_CPU
84	.cpu_die		= realview_cpu_die,
85#endif
86};
87