mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-20 19:09:52 +07:00
8701d8083d
Currently the SCU registers are mapped in SoC-specific code, using
different methods, all involving the static mapping set up from
machine_desc.map_io():
- On emev2, a static (non-identity) mapping is used, with ioremap().
As the static mapping uses the MT_DEVICE type, ioremap() reuses it,
and the returned virtual address is suitable for passing to
shmobile_smp_hook(),
- On sh73a0 and r8a7779, a static identity mapping is used, with the
legacy IOMEM() macro.
As the static mapping uses the MT_DEVICE_NONSHARED type, replacing
IOMEM() by ioremap() would create a new mapping, whose virtual
address cannot be passed to shmobile_smp_hook().
Move the mapping of the SCU registers from SoC-specific code to common
code, always using ioremap(). To work in the absence of a static
mapping, this requires passing the physical SCU base address to
shmobile_smp_hook().
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
104 lines
2.5 KiB
C
104 lines
2.5 KiB
C
/*
|
|
* SMP support for SoCs with SCU covered by mach-shmobile
|
|
*
|
|
* Copyright (C) 2013 Magnus Damm
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/cpu.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/smp.h>
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/smp_plat.h>
|
|
#include <asm/smp_scu.h>
|
|
#include "common.h"
|
|
|
|
|
|
static phys_addr_t shmobile_scu_base_phys;
|
|
static void __iomem *shmobile_scu_base;
|
|
|
|
static int shmobile_smp_scu_notifier_call(struct notifier_block *nfb,
|
|
unsigned long action, void *hcpu)
|
|
{
|
|
unsigned int cpu = (long)hcpu;
|
|
|
|
switch (action) {
|
|
case CPU_UP_PREPARE:
|
|
/* For this particular CPU register SCU SMP boot vector */
|
|
shmobile_smp_hook(cpu, virt_to_phys(shmobile_boot_scu),
|
|
shmobile_scu_base_phys);
|
|
break;
|
|
};
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block shmobile_smp_scu_notifier = {
|
|
.notifier_call = shmobile_smp_scu_notifier_call,
|
|
};
|
|
|
|
void __init shmobile_smp_scu_prepare_cpus(phys_addr_t scu_base_phys,
|
|
unsigned int max_cpus)
|
|
{
|
|
/* install boot code shared by all CPUs */
|
|
shmobile_boot_fn = virt_to_phys(shmobile_smp_boot);
|
|
|
|
/* enable SCU and cache coherency on booting CPU */
|
|
shmobile_scu_base_phys = scu_base_phys;
|
|
shmobile_scu_base = ioremap(scu_base_phys, PAGE_SIZE);
|
|
scu_enable(shmobile_scu_base);
|
|
scu_power_mode(shmobile_scu_base, SCU_PM_NORMAL);
|
|
|
|
/* Use CPU notifier for reset vector control */
|
|
register_cpu_notifier(&shmobile_smp_scu_notifier);
|
|
}
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
void shmobile_smp_scu_cpu_die(unsigned int cpu)
|
|
{
|
|
/* For this particular CPU deregister boot vector */
|
|
shmobile_smp_hook(cpu, 0, 0);
|
|
|
|
dsb();
|
|
flush_cache_all();
|
|
|
|
/* disable cache coherency */
|
|
scu_power_mode(shmobile_scu_base, SCU_PM_POWEROFF);
|
|
|
|
/* jump to shared mach-shmobile sleep / reset code */
|
|
shmobile_smp_sleep();
|
|
}
|
|
|
|
static int shmobile_smp_scu_psr_core_disabled(int cpu)
|
|
{
|
|
unsigned long mask = SCU_PM_POWEROFF << (cpu * 8);
|
|
|
|
if ((__raw_readl(shmobile_scu_base + 8) & mask) == mask)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int shmobile_smp_scu_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_smp_scu_psr_core_disabled(cpu))
|
|
return 1;
|
|
|
|
mdelay(1);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif
|