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openwrt-xburst/target/linux/xburst/files-2.6.27/arch/mips/jz4750/pm.c
Mirko Vogt dc3d3f1c49 yet another patchset - 2.6.27
it's basically also provided by ingenic and nativly based on 2.6.27,
adjusted to fit into the OpenWrt-environment
2009-10-28 03:13:11 +08:00

204 lines
4.8 KiB
C

/*
* linux/arch/mips/jz4750/common/pm.c
*
* JZ4750 Power Management Routines
*
* Copyright (C) 2006 Ingenic Semiconductor Inc.
* Author: <jlwei@ingenic.cn>
*
* This program is free software; you can distribute it and/or modify it
* under the terms of the GNU General Public License (Version 2) as
* published by the Free Software Foundation.
*
* This program is distributed in the hope 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/pm.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/sysctl.h>
#include <linux/module.h>
#include <linux/suspend.h>
#include <asm/cacheops.h>
#include <asm/jzsoc.h>
extern void jz_board_do_sleep(unsigned long *ptr);
extern void jz_board_do_resume(unsigned long *ptr);
static void jz_pm_do_hibernate(void)
{
printk("Put CPU into hibernate mode.\n");
/* Mask all interrupts */
REG_INTC_IMSR = 0xffffffff;
/*
* RTC Wakeup or 1Hz interrupt can be enabled or disabled
* through RTC driver's ioctl (linux/driver/char/rtc_jz.c).
*/
/* Set minimum wakeup_n pin low-level assertion time for wakeup: 100ms */
while (!(REG_RTC_RCR & RTC_RCR_WRDY));
REG_RTC_HWFCR = (100 << RTC_HWFCR_BIT);
/* Set reset pin low-level assertion time after wakeup: must > 60ms */
while (!(REG_RTC_RCR & RTC_RCR_WRDY));
REG_RTC_HRCR = (60 << RTC_HRCR_BIT); /* 60 ms */
/* Scratch pad register to be reserved */
while (!(REG_RTC_RCR & RTC_RCR_WRDY));
REG_RTC_HSPR = 0x12345678;
/* clear wakeup status register */
while (!(REG_RTC_RCR & RTC_RCR_WRDY));
REG_RTC_HWRSR = 0x0;
/* Put CPU to power down mode */
while (!(REG_RTC_RCR & RTC_RCR_WRDY));
REG_RTC_HCR = RTC_HCR_PD;
while (!(REG_RTC_RCR & RTC_RCR_WRDY));
while(1);
/* We can't get here */
}
static int jz_pm_do_sleep(void)
{
unsigned long delta;
unsigned long nfcsr = REG_EMC_NFCSR;
unsigned long opcr = REG_CPM_OPCR;
unsigned long imr = REG_INTC_IMR;
unsigned long sadc = REG_SADC_ENA;
unsigned long sleep_gpio_save[4*(GPIO_PORT_NUM-1)];
printk("Put CPU into sleep mode.\n");
/* Preserve current time */
delta = xtime.tv_sec - REG_RTC_RSR;
/* Disable nand flash */
REG_EMC_NFCSR = ~0xff;
/* stop sadc */
REG_SADC_ENA &= ~0x7;
while((REG_SADC_ENA & 0x7) != 0);
udelay(100);
/*stop udc and usb*/
__cpm_suspend_uhcphy();
__cpm_suspend_udcphy();
/* Mask all interrupts */
REG_INTC_IMSR = 0xffffffff;
/* Sleep on-board modules and setup wake event */
jz_board_do_sleep(sleep_gpio_save);
/* disable externel clock Oscillator in sleep mode */
__cpm_disable_osc_in_sleep();
/* select 32K crystal as RTC clock in sleep mode */
__cpm_select_rtcclk_rtc();
/* Enter SLEEP mode */
REG_CPM_LCR &= ~CPM_LCR_LPM_MASK;
REG_CPM_LCR |= CPM_LCR_LPM_SLEEP;
__asm__(".set\tmips3\n\t"
"wait\n\t"
".set\tmips0");
/* Restore to IDLE mode */
REG_CPM_LCR &= ~CPM_LCR_LPM_MASK;
REG_CPM_LCR |= CPM_LCR_LPM_IDLE;
/* Restore nand flash control register */
REG_EMC_NFCSR = nfcsr;
/* Restore interrupts */
REG_INTC_IMSR = imr;
REG_INTC_IMCR = ~imr;
/* Restore sadc */
REG_SADC_ENA = sadc;
/* Resume on-board modules */
jz_board_do_resume(sleep_gpio_save);
/* Restore Oscillator and Power Control Register */
REG_CPM_OPCR = opcr;
/* Restore current time */
xtime.tv_sec = REG_RTC_RSR + delta;
printk("Resume CPU from sleep mode.\n");
return 0;
}
/* Put CPU to HIBERNATE mode
*----------------------------------------------------------------------------
* Power Management sleep sysctl interface
*
* Write "mem" to /sys/power/state invokes this function
* which initiates a poweroff.
*/
void jz_pm_hibernate(void)
{
jz_pm_do_hibernate();
}
/* Put CPU to SLEEP mode
*----------------------------------------------------------------------------
* Power Management sleep sysctl interface
*
* Write "standby" to /sys/power/state invokes this function
* which initiates a sleep.
*/
int jz_pm_sleep(void)
{
return jz_pm_do_sleep();
}
/*
* valid states, only support standby(sleep) and mem(hibernate)
*/
static int jz4750_pm_valid(suspend_state_t state)
{
return state == PM_SUSPEND_MEM;
}
/*
* Jz CPU enter save power mode
*/
static int jz4750_pm_enter(suspend_state_t state)
{
return jz_pm_do_sleep();
}
static struct platform_suspend_ops jz4750_pm_ops = {
.valid = jz4750_pm_valid,
.enter = jz4750_pm_enter,
};
/*
* Initialize power interface
*/
int __init jz_pm_init(void)
{
printk("JZ4750 Power Management\n");
suspend_set_ops(&jz4750_pm_ops);
return 0;
}