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author | Tsahee Zidenberg <tsahee@annapurnalabs.com> | 2015-03-12 14:53:06 +0300 |
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committer | Arnd Bergmann <arnd@arndb.de> | 2015-03-16 17:24:12 +0300 |
commit | e9e06f2853dd86791e665b2aa3c8acb5b0007e07 (patch) | |
tree | 8ee22e89f2e01f9442cfecd9b2608851526f2b98 /arch/arm/mach-alpine/platsmp.c | |
parent | 3c215e64eb00f1ea5c67de2141ba816cb3f3c682 (diff) | |
download | linux-e9e06f2853dd86791e665b2aa3c8acb5b0007e07.tar.xz |
ARM: Alpine: smp support
This patch introduces support for waking up secondary CPU cores on
Alpine platform.
Signed-off-by: Barak Wasserstrom <barak@annapurnalabs.com>
Signed-off-by: Tsahee Zidenberg <tsahee@annapurnalabs.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/arm/mach-alpine/platsmp.c')
-rw-r--r-- | arch/arm/mach-alpine/platsmp.c | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/arm/mach-alpine/platsmp.c b/arch/arm/mach-alpine/platsmp.c new file mode 100644 index 000000000000..f78429f48bd6 --- /dev/null +++ b/arch/arm/mach-alpine/platsmp.c @@ -0,0 +1,49 @@ +/* + * SMP operations for Alpine platform. + * + * Copyright (C) 2015 Annapurna Labs Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/init.h> +#include <linux/errno.h> +#include <linux/io.h> +#include <linux/of.h> + +#include <asm/smp_plat.h> + +#include "alpine_cpu_pm.h" + +static int alpine_boot_secondary(unsigned int cpu, struct task_struct *idle) +{ + phys_addr_t addr; + + addr = virt_to_phys(secondary_startup); + + if (addr > (phys_addr_t)(uint32_t)(-1)) { + pr_err("FAIL: resume address over 32bit (%pa)", &addr); + return -EINVAL; + } + + return alpine_cpu_wakeup(cpu_logical_map(cpu), (uint32_t)addr); +} + +static void __init alpine_smp_prepare_cpus(unsigned int max_cpus) +{ + alpine_cpu_pm_init(); +} + +static struct smp_operations alpine_smp_ops __initdata = { + .smp_prepare_cpus = alpine_smp_prepare_cpus, + .smp_boot_secondary = alpine_boot_secondary, +}; +CPU_METHOD_OF_DECLARE(alpine_smp, "al,alpine-smp", &alpine_smp_ops); |