blob: 5356a72bc8ce901fdf82d0626f6ca59c9bfa85bf [file] [log] [blame]
Dinh Nguyen9c4566a2012-10-25 10:41:39 -06001/*
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>
Dinh Nguyen9c4566a2012-10-25 10:41:39 -060027#include <asm/smp_scu.h>
28#include <asm/smp_plat.h>
29
30#include "core.h"
31
Paul Gortmaker8bd26e32013-06-17 15:43:14 -040032static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
Dinh Nguyen9c4566a2012-10-25 10:41:39 -060033{
34 int trampoline_size = &secondary_trampoline_end - &secondary_trampoline;
35
Dinh Nguyend6dd7352013-02-11 17:30:33 -060036 if (cpu1start_addr) {
37 memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size);
Dinh Nguyen9c4566a2012-10-25 10:41:39 -060038
Dinh Nguyend6dd7352013-02-11 17:30:33 -060039 __raw_writel(virt_to_phys(socfpga_secondary_startup),
40 (sys_manager_base_addr + (cpu1start_addr & 0x000000ff)));
Dinh Nguyen9c4566a2012-10-25 10:41:39 -060041
Dinh Nguyend6dd7352013-02-11 17:30:33 -060042 flush_cache_all();
43 smp_wmb();
44 outer_clean_range(0, trampoline_size);
Dinh Nguyen9c4566a2012-10-25 10:41:39 -060045
Dinh Nguyend6dd7352013-02-11 17:30:33 -060046 /* This will release CPU #1 out of reset.*/
47 __raw_writel(0, rst_manager_base_addr + 0x10);
48 }
Dinh Nguyen9c4566a2012-10-25 10:41:39 -060049
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);
Dinh Nguyen9c4566a2012-10-25 10:41:39 -060075}
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,
Dinh Nguyen9c4566a2012-10-25 10:41:39 -060098 .smp_boot_secondary = socfpga_boot_secondary,
99#ifdef CONFIG_HOTPLUG_CPU
100 .cpu_die = socfpga_cpu_die,
101#endif
102};