Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[linux/fpc-iii.git] / arch / arm / mach-socfpga / platsmp.c
blob5356a72bc8ce901fdf82d0626f6ca59c9bfa85bf
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
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.
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.
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/>.
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>
26 #include <asm/cacheflush.h>
27 #include <asm/smp_scu.h>
28 #include <asm/smp_plat.h>
30 #include "core.h"
32 static int socfpga_boot_secondary(unsigned int cpu, struct task_struct *idle)
34 int trampoline_size = &secondary_trampoline_end - &secondary_trampoline;
36 if (cpu1start_addr) {
37 memcpy(phys_to_virt(0), &secondary_trampoline, trampoline_size);
39 __raw_writel(virt_to_phys(socfpga_secondary_startup),
40 (sys_manager_base_addr + (cpu1start_addr & 0x000000ff)));
42 flush_cache_all();
43 smp_wmb();
44 outer_clean_range(0, trampoline_size);
46 /* This will release CPU #1 out of reset.*/
47 __raw_writel(0, rst_manager_base_addr + 0x10);
50 return 0;
54 * Initialise the CPU possible map early - this describes the CPUs
55 * which may be present or become present in the system.
57 static void __init socfpga_smp_init_cpus(void)
59 unsigned int i, ncores;
61 ncores = scu_get_core_count(socfpga_scu_base_addr);
63 for (i = 0; i < ncores; i++)
64 set_cpu_possible(i, true);
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();
73 for (i = 0; i < ncores; i++)
74 set_cpu_possible(i, true);
77 static void __init socfpga_smp_prepare_cpus(unsigned int max_cpus)
79 scu_enable(socfpga_scu_base_addr);
83 * platform-specific code to shutdown a CPU
85 * Called with IRQs disabled
87 static void socfpga_cpu_die(unsigned int cpu)
89 cpu_do_idle();
91 /* We should have never returned from idle */
92 panic("cpu %d unexpectedly exit from shutdown\n", cpu);
95 struct 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