c942fddf87
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>
62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Low-level power-management support for Alpine platform.
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*
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* Copyright (C) 2015 Annapurna Labs Ltd.
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*/
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/regmap.h>
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#include <linux/mfd/syscon.h>
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#include "alpine_cpu_pm.h"
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#include "alpine_cpu_resume.h"
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/* NB registers */
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#define AL_SYSFAB_POWER_CONTROL(cpu) (0x2000 + (cpu)*0x100 + 0x20)
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static struct regmap *al_sysfabric;
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static struct al_cpu_resume_regs __iomem *al_cpu_resume_regs;
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static int wakeup_supported;
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int alpine_cpu_wakeup(unsigned int phys_cpu, uint32_t phys_resume_addr)
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{
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if (!wakeup_supported)
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return -ENOSYS;
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/*
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* Set CPU resume address -
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* secure firmware running on boot will jump to this address
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* after setting proper CPU mode, and initialiing e.g. secure
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* regs (the same mode all CPUs are booted to - usually HYP)
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*/
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writel(phys_resume_addr,
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&al_cpu_resume_regs->per_cpu[phys_cpu].resume_addr);
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/* Power-up the CPU */
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regmap_write(al_sysfabric, AL_SYSFAB_POWER_CONTROL(phys_cpu), 0);
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return 0;
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}
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void __init alpine_cpu_pm_init(void)
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{
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struct device_node *np;
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uint32_t watermark;
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al_sysfabric = syscon_regmap_lookup_by_compatible("al,alpine-sysfabric-service");
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np = of_find_compatible_node(NULL, NULL, "al,alpine-cpu-resume");
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al_cpu_resume_regs = of_iomap(np, 0);
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wakeup_supported = !IS_ERR(al_sysfabric) && al_cpu_resume_regs;
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if (wakeup_supported) {
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watermark = readl(&al_cpu_resume_regs->watermark);
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wakeup_supported = (watermark & AL_CPU_RESUME_MAGIC_NUM_MASK)
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== AL_CPU_RESUME_MAGIC_NUM;
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}
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}
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