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: 4ec5183ec48656cec489c49f989c508b68b518e3 authored by Linus Torvalds on 05 February 2023, 21:13:28 UTC
Linux 6.2-rc7
Linux 6.2-rc7
Tip revision: 4ec5183
alpine_cpu_pm.c
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Low-level power-management support for Alpine platform.
*
* Copyright (C) 2015 Annapurna Labs Ltd.
*/
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include "alpine_cpu_pm.h"
#include "alpine_cpu_resume.h"
/* NB registers */
#define AL_SYSFAB_POWER_CONTROL(cpu) (0x2000 + (cpu)*0x100 + 0x20)
static struct regmap *al_sysfabric;
static struct al_cpu_resume_regs __iomem *al_cpu_resume_regs;
static int wakeup_supported;
int alpine_cpu_wakeup(unsigned int phys_cpu, uint32_t phys_resume_addr)
{
if (!wakeup_supported)
return -ENOSYS;
/*
* Set CPU resume address -
* secure firmware running on boot will jump to this address
* after setting proper CPU mode, and initialiing e.g. secure
* regs (the same mode all CPUs are booted to - usually HYP)
*/
writel(phys_resume_addr,
&al_cpu_resume_regs->per_cpu[phys_cpu].resume_addr);
/* Power-up the CPU */
regmap_write(al_sysfabric, AL_SYSFAB_POWER_CONTROL(phys_cpu), 0);
return 0;
}
void __init alpine_cpu_pm_init(void)
{
struct device_node *np;
uint32_t watermark;
al_sysfabric = syscon_regmap_lookup_by_compatible("al,alpine-sysfabric-service");
np = of_find_compatible_node(NULL, NULL, "al,alpine-cpu-resume");
al_cpu_resume_regs = of_iomap(np, 0);
wakeup_supported = !IS_ERR(al_sysfabric) && al_cpu_resume_regs;
if (wakeup_supported) {
watermark = readl(&al_cpu_resume_regs->watermark);
wakeup_supported = (watermark & AL_CPU_RESUME_MAGIC_NUM_MASK)
== AL_CPU_RESUME_MAGIC_NUM;
}
}