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157 lines
3.8 KiB
C
157 lines
3.8 KiB
C
/* linux/arch/arm/mach-s3c2410/pm.c
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*
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* Copyright (c) 2006 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C2410 (and compatible) Power Manager (Suspend-To-RAM) support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/suspend.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/sysdev.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include <asm/mach-types.h>
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#include <mach/regs-gpio.h>
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#include <mach/h1940.h>
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#include <plat/cpu.h>
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#include <plat/pm.h>
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#ifdef CONFIG_S3C2410_PM_DEBUG
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extern void pm_dbg(const char *fmt, ...);
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#define DBG(fmt...) pm_dbg(fmt)
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#else
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#define DBG(fmt...) printk(KERN_DEBUG fmt)
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#endif
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static void s3c2410_pm_prepare(void)
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{
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/* ensure at least GSTATUS3 has the resume address */
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__raw_writel(virt_to_phys(s3c2410_cpu_resume), S3C2410_GSTATUS3);
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DBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3));
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DBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4));
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if (machine_is_h1940()) {
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void *base = phys_to_virt(H1940_SUSPEND_CHECK);
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unsigned long ptr;
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unsigned long calc = 0;
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/* generate check for the bootloader to check on resume */
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for (ptr = 0; ptr < 0x40000; ptr += 0x400)
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calc += __raw_readl(base+ptr);
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__raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
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}
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/* the RX3715 uses similar code and the same H1940 and the
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* same offsets for resume and checksum pointers */
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if (machine_is_rx3715()) {
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void *base = phys_to_virt(H1940_SUSPEND_CHECK);
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unsigned long ptr;
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unsigned long calc = 0;
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/* generate check for the bootloader to check on resume */
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for (ptr = 0; ptr < 0x40000; ptr += 0x4)
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calc += __raw_readl(base+ptr);
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__raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
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}
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if ( machine_is_aml_m5900() )
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s3c2410_gpio_setpin(S3C2410_GPF2, 1);
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}
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static int s3c2410_pm_resume(struct sys_device *dev)
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{
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unsigned long tmp;
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/* unset the return-from-sleep flag, to ensure reset */
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tmp = __raw_readl(S3C2410_GSTATUS2);
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tmp &= S3C2410_GSTATUS2_OFFRESET;
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__raw_writel(tmp, S3C2410_GSTATUS2);
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if ( machine_is_aml_m5900() )
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s3c2410_gpio_setpin(S3C2410_GPF2, 0);
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return 0;
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}
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static int s3c2410_pm_add(struct sys_device *dev)
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{
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pm_cpu_prep = s3c2410_pm_prepare;
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pm_cpu_sleep = s3c2410_cpu_suspend;
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return 0;
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}
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#if defined(CONFIG_CPU_S3C2410)
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static struct sysdev_driver s3c2410_pm_driver = {
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.add = s3c2410_pm_add,
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.resume = s3c2410_pm_resume,
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};
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/* register ourselves */
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static int __init s3c2410_pm_drvinit(void)
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{
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return sysdev_driver_register(&s3c2410_sysclass, &s3c2410_pm_driver);
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}
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arch_initcall(s3c2410_pm_drvinit);
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#endif
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#if defined(CONFIG_CPU_S3C2440)
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static struct sysdev_driver s3c2440_pm_driver = {
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.add = s3c2410_pm_add,
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.resume = s3c2410_pm_resume,
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};
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static int __init s3c2440_pm_drvinit(void)
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{
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return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_pm_driver);
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}
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arch_initcall(s3c2440_pm_drvinit);
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#endif
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#if defined(CONFIG_CPU_S3C2442)
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static struct sysdev_driver s3c2442_pm_driver = {
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.add = s3c2410_pm_add,
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.resume = s3c2410_pm_resume,
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};
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static int __init s3c2442_pm_drvinit(void)
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{
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return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_pm_driver);
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}
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arch_initcall(s3c2442_pm_drvinit);
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#endif
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