1/*
2 * Copyright 2010-2011 Calxeda, Inc.
3 * Copyright 2012 Pavel Machek <pavel@denx.de>
4 * Based on platsmp.c, Copyright (C) 2002 ARM Ltd.
5 * Copyright (C) 2012 Altera Corporation
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
14 * more details.
15 *
16 * You should have received a copy of the GNU General Public License along with
17 * this program.  If not, see <http://www.gnu.org/licenses/>.
18 */
19#include <linux/delay.h>
20#include <linux/init.h>
21#include <linux/smp.h>
22#include <linux/io.h>
23#include <linux/of.h>
24#include <linux/of_address.h>
25
26#include <asm/cacheflush.h>
27#include <asm/smp_scu.h>
28#include <asm/smp_plat.h>
29
30#include "core.h"
31
32static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
33{
34	int trampoline_size = &secondary_trampoline_end - &secondary_trampoline;
35
36	if (socfpga_cpu1start_addr) {
37		/* This will put CPU #1 into reset. */
38		writel(RSTMGR_MPUMODRST_CPU1,
39		       rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST);
40
41		memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size);
42
43		writel(virt_to_phys(secondary_startup),
44		       sys_manager_base_addr + (socfpga_cpu1start_addr & 0x000000ff));
45
46		flush_cache_all();
47		smp_wmb();
48		outer_clean_range(0, trampoline_size);
49
50		/* This will release CPU #1 out of reset. */
51		writel(0, rst_manager_base_addr + SOCFPGA_RSTMGR_MODMPURST);
52	}
53
54	return 0;
55}
56
57/*
58 * Initialise the CPU possible map early - this describes the CPUs
59 * which may be present or become present in the system.
60 */
61static void __init socfpga_smp_init_cpus(void)
62{
63	unsigned int i, ncores;
64
65	ncores = scu_get_core_count(socfpga_scu_base_addr);
66
67	for (i = 0; i < ncores; i++)
68		set_cpu_possible(i, true);
69
70	/* sanity check */
71	if (ncores > num_possible_cpus()) {
72		pr_warn("socfpga: no. of cores (%d) greater than configured"
73			"maximum of %d - clipping\n", ncores, num_possible_cpus());
74		ncores = num_possible_cpus();
75	}
76
77	for (i = 0; i < ncores; i++)
78		set_cpu_possible(i, true);
79}
80
81static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
82{
83	scu_enable(socfpga_scu_base_addr);
84}
85
86/*
87 * platform-specific code to shutdown a CPU
88 *
89 * Called with IRQs disabled
90 */
91static void socfpga_cpu_die(unsigned int cpu)
92{
93	/* Do WFI. If we wake up early, go back into WFI */
94	while (1)
95		cpu_do_idle();
96}
97
98struct smp_operations socfpga_smp_ops __initdata = {
99	.smp_init_cpus		= socfpga_smp_init_cpus,
100	.smp_prepare_cpus	= socfpga_smp_prepare_cpus,
101	.smp_boot_secondary	= socfpga_boot_secondary,
102#ifdef CONFIG_HOTPLUG_CPU
103	.cpu_die		= socfpga_cpu_die,
104#endif
105};
106