From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/arm/mach-alpine/alpine_cpu_pm.c | 70 +++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 kernel/arch/arm/mach-alpine/alpine_cpu_pm.c (limited to 'kernel/arch/arm/mach-alpine/alpine_cpu_pm.c') diff --git a/kernel/arch/arm/mach-alpine/alpine_cpu_pm.c b/kernel/arch/arm/mach-alpine/alpine_cpu_pm.c new file mode 100644 index 000000000..121c77c4b --- /dev/null +++ b/kernel/arch/arm/mach-alpine/alpine_cpu_pm.c @@ -0,0 +1,70 @@ +/* + * Low-level power-management support for Alpine platform. + * + * Copyright (C) 2015 Annapurna Labs Ltd. + * + * 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. + */ + +#include +#include +#include +#include +#include + +#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; + } +} -- cgit 1.2.3-korg