mirror of
https://github.com/torvalds/linux.git
synced 2024-12-30 23:02:08 +00:00
40937f7460
This reverts commit 865d90f803.
The code changes the flags of the wrong cpus - which breaks the whole
bootup of secondary CPUs.
Cc: Bastian Hecht <hechtb@gmail.com>
Signed-off-by: Simon Horman <horms@verge.net.au>
135 lines
3.4 KiB
C
135 lines
3.4 KiB
C
/*
|
|
* SMP support for Emma Mobile EV2
|
|
*
|
|
* Copyright (C) 2012 Renesas Solutions Corp.
|
|
* Copyright (C) 2012 Magnus Damm
|
|
*
|
|
* 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; version 2 of the License.
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/io.h>
|
|
#include <linux/delay.h>
|
|
#include <mach/common.h>
|
|
#include <mach/emev2.h>
|
|
#include <asm/smp_plat.h>
|
|
#include <asm/smp_scu.h>
|
|
#include <asm/hardware/gic.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
#define EMEV2_SCU_BASE 0x1e000000
|
|
|
|
static DEFINE_SPINLOCK(scu_lock);
|
|
static void __iomem *scu_base;
|
|
|
|
static void modify_scu_cpu_psr(unsigned long set, unsigned long clr)
|
|
{
|
|
unsigned long tmp;
|
|
|
|
/* we assume this code is running on a different cpu
|
|
* than the one that is changing coherency setting */
|
|
spin_lock(&scu_lock);
|
|
tmp = readl(scu_base + 8);
|
|
tmp &= ~clr;
|
|
tmp |= set;
|
|
writel(tmp, scu_base + 8);
|
|
spin_unlock(&scu_lock);
|
|
|
|
}
|
|
|
|
static unsigned int __init emev2_get_core_count(void)
|
|
{
|
|
if (!scu_base) {
|
|
scu_base = ioremap(EMEV2_SCU_BASE, PAGE_SIZE);
|
|
emev2_clock_init(); /* need ioremapped SMU */
|
|
}
|
|
|
|
WARN_ON_ONCE(!scu_base);
|
|
|
|
return scu_base ? scu_get_core_count(scu_base) : 1;
|
|
}
|
|
|
|
static int emev2_platform_cpu_kill(unsigned int cpu)
|
|
{
|
|
return 0; /* not supported yet */
|
|
}
|
|
|
|
static int __maybe_unused emev2_cpu_kill(unsigned int cpu)
|
|
{
|
|
int k;
|
|
|
|
/* this function is running on another CPU than the offline target,
|
|
* here we need wait for shutdown code in platform_cpu_die() to
|
|
* finish before asking SoC-specific code to power off the CPU core.
|
|
*/
|
|
for (k = 0; k < 1000; k++) {
|
|
if (shmobile_cpu_is_dead(cpu))
|
|
return emev2_platform_cpu_kill(cpu);
|
|
mdelay(1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void __cpuinit emev2_secondary_init(unsigned int cpu)
|
|
{
|
|
gic_secondary_init(0);
|
|
}
|
|
|
|
static int __cpuinit emev2_boot_secondary(unsigned int cpu, struct task_struct *idle)
|
|
{
|
|
cpu = cpu_logical_map(cpu);
|
|
|
|
/* enable cache coherency */
|
|
modify_scu_cpu_psr(0, 3 << (cpu * 8));
|
|
|
|
/* Tell ROM loader about our vector (in headsmp.S) */
|
|
emev2_set_boot_vector(__pa(shmobile_secondary_vector));
|
|
|
|
gic_raise_softirq(cpumask_of(cpu), 0);
|
|
return 0;
|
|
}
|
|
|
|
static void __init emev2_smp_prepare_cpus(unsigned int max_cpus)
|
|
{
|
|
int cpu = cpu_logical_map(0);
|
|
|
|
scu_enable(scu_base);
|
|
|
|
/* enable cache coherency on CPU0 */
|
|
modify_scu_cpu_psr(0, 3 << (cpu * 8));
|
|
}
|
|
|
|
static void __init emev2_smp_init_cpus(void)
|
|
{
|
|
unsigned int ncores = emev2_get_core_count();
|
|
|
|
shmobile_smp_init_cpus(ncores);
|
|
}
|
|
|
|
struct smp_operations emev2_smp_ops __initdata = {
|
|
.smp_init_cpus = emev2_smp_init_cpus,
|
|
.smp_prepare_cpus = emev2_smp_prepare_cpus,
|
|
.smp_secondary_init = emev2_secondary_init,
|
|
.smp_boot_secondary = emev2_boot_secondary,
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
.cpu_kill = emev2_cpu_kill,
|
|
.cpu_die = shmobile_cpu_die,
|
|
.cpu_disable = shmobile_cpu_disable,
|
|
#endif
|
|
};
|