~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/arch/arm/mach-alpine/alpine_cpu_pm.c

Version: ~ [ linux-5.12-rc7 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * Low-level power-management support for Alpine platform.
  3  *
  4  * Copyright (C) 2015 Annapurna Labs Ltd.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  */
 16 
 17 #include <linux/io.h>
 18 #include <linux/of.h>
 19 #include <linux/of_address.h>
 20 #include <linux/regmap.h>
 21 #include <linux/mfd/syscon.h>
 22 
 23 #include "alpine_cpu_pm.h"
 24 #include "alpine_cpu_resume.h"
 25 
 26 /* NB registers */
 27 #define AL_SYSFAB_POWER_CONTROL(cpu)    (0x2000 + (cpu)*0x100 + 0x20)
 28 
 29 static struct regmap *al_sysfabric;
 30 static struct al_cpu_resume_regs __iomem *al_cpu_resume_regs;
 31 static int wakeup_supported;
 32 
 33 int alpine_cpu_wakeup(unsigned int phys_cpu, uint32_t phys_resume_addr)
 34 {
 35         if (!wakeup_supported)
 36                 return -ENOSYS;
 37 
 38         /*
 39          * Set CPU resume address -
 40          * secure firmware running on boot will jump to this address
 41          * after setting proper CPU mode, and initialiing e.g. secure
 42          * regs (the same mode all CPUs are booted to - usually HYP)
 43          */
 44         writel(phys_resume_addr,
 45                &al_cpu_resume_regs->per_cpu[phys_cpu].resume_addr);
 46 
 47         /* Power-up the CPU */
 48         regmap_write(al_sysfabric, AL_SYSFAB_POWER_CONTROL(phys_cpu), 0);
 49 
 50         return 0;
 51 }
 52 
 53 void __init alpine_cpu_pm_init(void)
 54 {
 55         struct device_node *np;
 56         uint32_t watermark;
 57 
 58         al_sysfabric = syscon_regmap_lookup_by_compatible("al,alpine-sysfabric-service");
 59 
 60         np = of_find_compatible_node(NULL, NULL, "al,alpine-cpu-resume");
 61         al_cpu_resume_regs = of_iomap(np, 0);
 62 
 63         wakeup_supported = !IS_ERR(al_sysfabric) && al_cpu_resume_regs;
 64 
 65         if (wakeup_supported) {
 66                 watermark = readl(&al_cpu_resume_regs->watermark);
 67                 wakeup_supported = (watermark & AL_CPU_RESUME_MAGIC_NUM_MASK)
 68                                     == AL_CPU_RESUME_MAGIC_NUM;
 69         }
 70 }
 71 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp