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linux/arch/arm/mach-alpine/alpine_cpu_pm.c
Thomas Gleixner c942fddf87 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
Based on 3 normalized pattern(s):

  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

  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 [author] [kishon] [vijay] [abraham]
  [i] [kishon]@[ti] [com] 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

  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 [author] [graeme] [gregory]
  [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i]
  [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema]
  [hk] [hemahk]@[ti] [com] 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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1105 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:37 -07:00

62 lines
1.6 KiB
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;
}
}