https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: d6e0a2dd12f4067a5bcefb8bbd8ddbeff800afbc authored by Linus Torvalds on 04 January 2014, 23:12:14 UTC
Linux 3.13-rc7
Linux 3.13-rc7
Tip revision: d6e0a2d
smp_scu.c
/*
* linux/arch/arm/kernel/smp_scu.c
*
* Copyright (C) 2002 ARM Ltd.
* All Rights Reserved
*
* 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/init.h>
#include <linux/io.h>
#include <asm/smp_plat.h>
#include <asm/smp_scu.h>
#include <asm/cacheflush.h>
#include <asm/cputype.h>
#define SCU_CTRL 0x00
#define SCU_CONFIG 0x04
#define SCU_CPU_STATUS 0x08
#define SCU_INVALIDATE 0x0c
#define SCU_FPGA_REVISION 0x10
#ifdef CONFIG_SMP
/*
* Get the number of CPU cores from the SCU configuration
*/
unsigned int __init scu_get_core_count(void __iomem *scu_base)
{
unsigned int ncores = readl_relaxed(scu_base + SCU_CONFIG);
return (ncores & 0x03) + 1;
}
/*
* Enable the SCU
*/
void scu_enable(void __iomem *scu_base)
{
u32 scu_ctrl;
#ifdef CONFIG_ARM_ERRATA_764369
/* Cortex-A9 only */
if ((read_cpuid_id() & 0xff0ffff0) == 0x410fc090) {
scu_ctrl = readl_relaxed(scu_base + 0x30);
if (!(scu_ctrl & 1))
writel_relaxed(scu_ctrl | 0x1, scu_base + 0x30);
}
#endif
scu_ctrl = readl_relaxed(scu_base + SCU_CTRL);
/* already enabled? */
if (scu_ctrl & 1)
return;
scu_ctrl |= 1;
writel_relaxed(scu_ctrl, scu_base + SCU_CTRL);
/*
* Ensure that the data accessed by CPU0 before the SCU was
* initialised is visible to the other CPUs.
*/
flush_cache_all();
}
#endif
/*
* Set the executing CPUs power mode as defined. This will be in
* preparation for it executing a WFI instruction.
*
* This function must be called with preemption disabled, and as it
* has the side effect of disabling coherency, caches must have been
* flushed. Interrupts must also have been disabled.
*/
int scu_power_mode(void __iomem *scu_base, unsigned int mode)
{
unsigned int val;
int cpu = MPIDR_AFFINITY_LEVEL(cpu_logical_map(smp_processor_id()), 0);
if (mode > 3 || mode == 1 || cpu > 3)
return -EINVAL;
val = readb_relaxed(scu_base + SCU_CPU_STATUS + cpu) & ~0x03;
val |= mode;
writeb_relaxed(val, scu_base + SCU_CPU_STATUS + cpu);
return 0;
}