1/*
2 * Symmetric Multi Processing (SMP) support for Marvell EBU Cortex-A9
3 * based SOCs (Armada 375/38x).
4 *
5 * Copyright (C) 2014 Marvell
6 *
7 * Gregory CLEMENT <gregory.clement@free-electrons.com>
8 * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
9 *
10 * This file is licensed under the terms of the GNU General Public
11 * License version 2.  This program is licensed "as is" without any
12 * warranty of any kind, whether express or implied.
13 */
14
15#include <linux/init.h>
16#include <linux/io.h>
17#include <linux/of.h>
18#include <linux/smp.h>
19#include <linux/mbus.h>
20#include <asm/smp_scu.h>
21#include <asm/smp_plat.h>
22#include "common.h"
23#include "pmsu.h"
24
25extern void mvebu_cortex_a9_secondary_startup(void);
26
27static int __cpuinit mvebu_cortex_a9_boot_secondary(unsigned int cpu,
28						    struct task_struct *idle)
29{
30	int ret, hw_cpu;
31
32	pr_info("Booting CPU %d\n", cpu);
33
34	/*
35	 * Write the address of secondary startup into the system-wide
36	 * flags register. The boot monitor waits until it receives a
37	 * soft interrupt, and then the secondary CPU branches to this
38	 * address.
39	 */
40	hw_cpu = cpu_logical_map(cpu);
41	if (of_machine_is_compatible("marvell,armada375"))
42		mvebu_system_controller_set_cpu_boot_addr(mvebu_cortex_a9_secondary_startup);
43	else
44		mvebu_pmsu_set_cpu_boot_addr(hw_cpu, mvebu_cortex_a9_secondary_startup);
45	smp_wmb();
46	ret = mvebu_cpu_reset_deassert(hw_cpu);
47	if (ret) {
48		pr_err("Could not start the secondary CPU: %d\n", ret);
49		return ret;
50	}
51	arch_send_wakeup_ipi_mask(cpumask_of(cpu));
52
53	return 0;
54}
55
56static struct smp_operations mvebu_cortex_a9_smp_ops __initdata = {
57	.smp_boot_secondary	= mvebu_cortex_a9_boot_secondary,
58};
59
60CPU_METHOD_OF_DECLARE(mvebu_armada_375_smp, "marvell,armada-375-smp",
61		      &mvebu_cortex_a9_smp_ops);
62CPU_METHOD_OF_DECLARE(mvebu_armada_380_smp, "marvell,armada-380-smp",
63		      &mvebu_cortex_a9_smp_ops);
64