Linux Kernel iMX6
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/* linux/arch/arm/mach-s3c2410/pm.c
*
* Copyright (c) 2006 Simtec Electronics
* Ben Dooks <ben@simtec.co.uk>
*
* S3C2410 (and compatible) Power Manager (Suspend-To-RAM) support
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <linux/init.h>
#include <linux/suspend.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/device.h>
#include <linux/syscore_ops.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <mach/regs-gpio.h>
#include <mach/gpio-samsung.h>
#include <plat/cpu.h>
#include <plat/pm.h>
#include "h1940.h"
static void s3c2410_pm_prepare(void)
{
/* ensure at least GSTATUS3 has the resume address */
__raw_writel(virt_to_phys(s3c_cpu_resume), S3C2410_GSTATUS3);
S3C_PMDBG("GSTATUS3 0x%08x\n", __raw_readl(S3C2410_GSTATUS3));
S3C_PMDBG("GSTATUS4 0x%08x\n", __raw_readl(S3C2410_GSTATUS4));
if (machine_is_h1940()) {
void *base = phys_to_virt(H1940_SUSPEND_CHECK);
unsigned long ptr;
unsigned long calc = 0;
/* generate check for the bootloader to check on resume */
for (ptr = 0; ptr < 0x40000; ptr += 0x400)
calc += __raw_readl(base+ptr);
__raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
}
/* RX3715 and RX1950 use similar to H1940 code and the
* same offsets for resume and checksum pointers */
if (machine_is_rx3715() || machine_is_rx1950()) {
void *base = phys_to_virt(H1940_SUSPEND_CHECK);
unsigned long ptr;
unsigned long calc = 0;
/* generate check for the bootloader to check on resume */
for (ptr = 0; ptr < 0x40000; ptr += 0x4)
calc += __raw_readl(base+ptr);
__raw_writel(calc, phys_to_virt(H1940_SUSPEND_CHECKSUM));
}
if (machine_is_aml_m5900()) {
gpio_request_one(S3C2410_GPF(2), GPIOF_OUT_INIT_HIGH, NULL);
gpio_free(S3C2410_GPF(2));
}
if (machine_is_rx1950()) {
/* According to S3C2442 user's manual, page 7-17,
* when the system is operating in NAND boot mode,
* the hardware pin configuration - EINT[23:21] –
* must be set as input for starting up after
* wakeup from sleep mode
*/
s3c_gpio_cfgpin(S3C2410_GPG(13), S3C2410_GPIO_INPUT);
s3c_gpio_cfgpin(S3C2410_GPG(14), S3C2410_GPIO_INPUT);
s3c_gpio_cfgpin(S3C2410_GPG(15), S3C2410_GPIO_INPUT);
}
}
static void s3c2410_pm_resume(void)
{
unsigned long tmp;
/* unset the return-from-sleep flag, to ensure reset */
tmp = __raw_readl(S3C2410_GSTATUS2);
tmp &= S3C2410_GSTATUS2_OFFRESET;
__raw_writel(tmp, S3C2410_GSTATUS2);
if (machine_is_aml_m5900()) {
gpio_request_one(S3C2410_GPF(2), GPIOF_OUT_INIT_LOW, NULL);
gpio_free(S3C2410_GPF(2));
}
}
struct syscore_ops s3c2410_pm_syscore_ops = {
.resume = s3c2410_pm_resume,
};
static int s3c2410_pm_add(struct device *dev, struct subsys_interface *sif)
{
pm_cpu_prep = s3c2410_pm_prepare;
pm_cpu_sleep = s3c2410_cpu_suspend;
return 0;
}
#if defined(CONFIG_CPU_S3C2410)
static struct subsys_interface s3c2410_pm_interface = {
.name = "s3c2410_pm",
.subsys = &s3c2410_subsys,
.add_dev = s3c2410_pm_add,
};
/* register ourselves */
static int __init s3c2410_pm_drvinit(void)
{
return subsys_interface_register(&s3c2410_pm_interface);
}
arch_initcall(s3c2410_pm_drvinit);
static struct subsys_interface s3c2410a_pm_interface = {
.name = "s3c2410a_pm",
.subsys = &s3c2410a_subsys,
.add_dev = s3c2410_pm_add,
};
static int __init s3c2410a_pm_drvinit(void)
{
return subsys_interface_register(&s3c2410a_pm_interface);
}
arch_initcall(s3c2410a_pm_drvinit);
#endif
#if defined(CONFIG_CPU_S3C2440)
static struct subsys_interface s3c2440_pm_interface = {
.name = "s3c2440_pm",
.subsys = &s3c2440_subsys,
.add_dev = s3c2410_pm_add,
};
static int __init s3c2440_pm_drvinit(void)
{
return subsys_interface_register(&s3c2440_pm_interface);
}
arch_initcall(s3c2440_pm_drvinit);
#endif
#if defined(CONFIG_CPU_S3C2442)
static struct subsys_interface s3c2442_pm_interface = {
.name = "s3c2442_pm",
.subsys = &s3c2442_subsys,
.add_dev = s3c2410_pm_add,
};
static int __init s3c2442_pm_drvinit(void)
{
return subsys_interface_register(&s3c2442_pm_interface);
}
arch_initcall(s3c2442_pm_drvinit);
#endif