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
 57static int socfpga_a10_boot_secondary(unsigned int cpu, struct task_struct *idle)
 58{
 59	int trampoline_size = &secondary_trampoline_end - &secondary_trampoline;
 60
 61	if (socfpga_cpu1start_addr) {
 62		writel(RSTMGR_MPUMODRST_CPU1, rst_manager_base_addr +
 63		       SOCFPGA_A10_RSTMGR_MODMPURST);
 64		memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size);
 65
 66		writel(virt_to_phys(secondary_startup),
 67		       sys_manager_base_addr + (socfpga_cpu1start_addr & 0x00000fff));
 68
 69		flush_cache_all();
 70		smp_wmb();
 71		outer_clean_range(0, trampoline_size);
 72
 73		/* This will release CPU #1 out of reset. */
 74		writel(0, rst_manager_base_addr + SOCFPGA_A10_RSTMGR_MODMPURST);
 75	}
 76
 77	return 0;
 78}
 79
 80static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
 81{
 82	struct device_node *np;
 83	void __iomem *socfpga_scu_base_addr;
 84
 85	np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
 86	if (!np) {
 87		pr_err("%s: missing scu\n", __func__);
 88		return;
 89	}
 90
 91	socfpga_scu_base_addr = of_iomap(np, 0);
 92	if (!socfpga_scu_base_addr)
 93		return;
 94	scu_enable(socfpga_scu_base_addr);
 95}
 96
 97#ifdef CONFIG_HOTPLUG_CPU
 98/*
 99 * platform-specific code to shutdown a CPU
100 *
101 * Called with IRQs disabled
102 */
103static void socfpga_cpu_die(unsigned int cpu)
104{
105	/* Do WFI. If we wake up early, go back into WFI */
106	while (1)
107		cpu_do_idle();
108}
109
110/*
111 * We need a dummy function so that platform_can_cpu_hotplug() knows
112 * we support CPU hotplug. However, the function does not need to do
113 * anything, because CPUs going offline just do WFI. We could reset
114 * the CPUs but it would increase power consumption.
115 */
116static int socfpga_cpu_kill(unsigned int cpu)
117{
118	return 1;
119}
120#endif
121
122static const struct smp_operations socfpga_smp_ops __initconst = {
123	.smp_prepare_cpus	= socfpga_smp_prepare_cpus,
124	.smp_boot_secondary	= socfpga_boot_secondary,
125#ifdef CONFIG_HOTPLUG_CPU
126	.cpu_die		= socfpga_cpu_die,
127	.cpu_kill		= socfpga_cpu_kill,
128#endif
129};
130
131static const struct smp_operations socfpga_a10_smp_ops __initconst = {
132	.smp_prepare_cpus	= socfpga_smp_prepare_cpus,
133	.smp_boot_secondary	= socfpga_a10_boot_secondary,
134#ifdef CONFIG_HOTPLUG_CPU
135	.cpu_die		= socfpga_cpu_die,
136	.cpu_kill		= socfpga_cpu_kill,
137#endif
138};
139
140CPU_METHOD_OF_DECLARE(socfpga_smp, "altr,socfpga-smp", &socfpga_smp_ops);
141CPU_METHOD_OF_DECLARE(socfpga_a10_smp, "altr,socfpga-a10-smp", &socfpga_a10_smp_ops);