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 (cpu1start_addr) {
 37		memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size);
 38
 39		__raw_writel(virt_to_phys(socfpga_secondary_startup),
 40			(sys_manager_base_addr + (cpu1start_addr & 0x000000ff)));
 41
 42		flush_cache_all();
 43		smp_wmb();
 44		outer_clean_range(0, trampoline_size);
 45
 46		/* This will release CPU #1 out of reset.*/
 47		__raw_writel(0, rst_manager_base_addr + 0x10);
 48	}
 49
 50	return 0;
 51}
 52
 53/*
 54 * Initialise the CPU possible map early - this describes the CPUs
 55 * which may be present or become present in the system.
 56 */
 57static void __init socfpga_smp_init_cpus(void)
 58{
 59	unsigned int i, ncores;
 60
 61	ncores = scu_get_core_count(socfpga_scu_base_addr);
 62
 63	for (i = 0; i < ncores; i++)
 64		set_cpu_possible(i, true);
 65
 66	/* sanity check */
 67	if (ncores > num_possible_cpus()) {
 68		pr_warn("socfpga: no. of cores (%d) greater than configured"
 69			"maximum of %d - clipping\n", ncores, num_possible_cpus());
 70		ncores = num_possible_cpus();
 71	}
 72
 73	for (i = 0; i < ncores; i++)
 74		set_cpu_possible(i, true);
 75}
 76
 77static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
 78{
 79	scu_enable(socfpga_scu_base_addr);
 80}
 81
 82/*
 83 * platform-specific code to shutdown a CPU
 84 *
 85 * Called with IRQs disabled
 86 */
 87static void socfpga_cpu_die(unsigned int cpu)
 88{
 89	cpu_do_idle();
 90
 91	/* We should have never returned from idle */
 92	panic("cpu %d unexpectedly exit from shutdown\n", cpu);
 93}
 94
 95struct smp_operations socfpga_smp_ops __initdata = {
 96	.smp_init_cpus		= socfpga_smp_init_cpus,
 97	.smp_prepare_cpus	= socfpga_smp_prepare_cpus,
 98	.smp_boot_secondary	= socfpga_boot_secondary,
 99#ifdef CONFIG_HOTPLUG_CPU
100	.cpu_die		= socfpga_cpu_die,
101#endif
102};