/*
* linux / arch / arm / mach - omap1 / pm . c
*
* OMAP Power Management Routines
*
* Original code for the SA11x0 :
* Copyright ( c ) 2001 Cliff Brake < cbrake @ accelent . com >
*
* Modified for the PXA250 by Nicolas Pitre :
* Copyright ( c ) 2002 Monta Vista Software , Inc .
*
* Modified for the OMAP1510 by David Singleton :
* Copyright ( c ) 2002 Monta Vista Software , Inc .
*
* Cleanup 2004 for OMAP1510 / 1610 by Dirk Behme < dirk . behme @ de . bosch . com >
*
* 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 SOFTWARE IS PROVIDED ` ` AS IS ' ' AND ANY EXPRESS OR IMPLIED
* WARRANTIES , INCLUDING , BUT NOT LIMITED TO , THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED . IN
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT , INDIRECT ,
* INCIDENTAL , SPECIAL , EXEMPLARY , OR CONSEQUENTIAL DAMAGES ( INCLUDING , BUT
* NOT LIMITED TO , PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES ; LOSS OF
* USE , DATA , OR PROFITS ; OR BUSINESS INTERRUPTION ) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY , WHETHER IN CONTRACT , STRICT LIABILITY , OR TORT
* ( INCLUDING NEGLIGENCE OR OTHERWISE ) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE , EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE .
*
* 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 . ,
* 675 Mass Ave , Cambridge , MA 02139 , USA .
*/
#include <linux/suspend.h>
#include <linux/sched.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/interrupt.h>
#include <linux/sysfs.h>
#include <linux/module.h>
#include <linux/io.h>
#include <linux/atomic.h>
#include <linux/cpu.h>
#include <asm /fncpy.h>
#include <asm /system_misc.h>
#include <asm /irq.h>
#include <asm /mach/time.h>
#include <asm /mach/irq.h>
#include <linux/soc/ti/omap1-io.h>
#include "tc.h"
#include <linux/omap-dma.h>
#include <clocksource/timer-ti-dm.h>
#include "hardware.h"
#include "mux.h"
#include "irqs.h"
#include "iomap.h"
#include "clock.h"
#include "pm.h"
#include "soc.h"
#include "sram.h"
static unsigned int arm_sleep_save[ARM_SLEEP_SAVE_SIZE];
static unsigned short dsp_sleep_save[DSP_SLEEP_SAVE_SIZE];
static unsigned short ulpd_sleep_save[ULPD_SLEEP_SAVE_SIZE];
static unsigned int mpui1510_sleep_save[MPUI1510_SLEEP_SAVE_SIZE];
static unsigned int mpui1610_sleep_save[MPUI1610_SLEEP_SAVE_SIZE];
static unsigned short enable_dyn_sleep;
static ssize_t idle_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "%hu\n" , enable_dyn_sleep);
}
static ssize_t idle_store(struct kobject *kobj, struct kobj_attribute *attr,
const char * buf, size_t n)
{
unsigned short value;
if (sscanf(buf, "%hu" , &value) != 1 ||
(value != 0 && value != 1 ) ||
(value != 0 && !IS_ENABLED(CONFIG_OMAP_32K_TIMER))) {
pr_err("idle_sleep_store: Invalid value\n" );
return -EINVAL;
}
enable_dyn_sleep = value;
return n;
}
static struct kobj_attribute sleep_while_idle_attr =
__ATTR(sleep_while_idle, 0644 , idle_show, idle_store);
static void (*omap_sram_suspend)(unsigned long r0, unsigned long r1) = NULL;
/*
* Let ' s power down on idle , but only if we are really
* idle , because once we start down the path of
* going idle we continue to do idle even if we get
* a clock tick interrupt . .
*/
void omap1_pm_idle(void )
{
extern __u32 arm_idlect1_mask;
__u32 use_idlect1 = arm_idlect1_mask;
local_fiq_disable();
#if defined (CONFIG_OMAP_MPU_TIMER) && !defined (CONFIG_OMAP_DM_TIMER)
use_idlect1 = use_idlect1 & ~(1 << 9 );
#endif
#ifdef CONFIG_OMAP_DM_TIMER
use_idlect1 = omap_dm_timer_modify_idlect_mask(use_idlect1);
#endif
if (omap_dma_running())
use_idlect1 &= ~(1 << 6 );
/*
* We should be able to remove the do_sleep variable and multiple
* tests above as soon as drivers , timer and DMA code have been fixed .
* Even the sleep block count should become obsolete .
*/
if ((use_idlect1 != ~0 ) || !enable_dyn_sleep) {
__u32 saved_idlect1 = omap_readl(ARM_IDLECT1);
if (cpu_is_omap15xx())
use_idlect1 &= OMAP1510_BIG_SLEEP_REQUEST;
else
use_idlect1 &= OMAP1610_IDLECT1_SLEEP_VAL;
omap_writel(use_idlect1, ARM_IDLECT1);
__asm__ volatile ("mcr p15, 0, r0, c7, c0, 4" );
omap_writel(saved_idlect1, ARM_IDLECT1);
local_fiq_enable();
return ;
}
omap_sram_suspend(omap_readl(ARM_IDLECT1),
omap_readl(ARM_IDLECT2));
local_fiq_enable();
}
/*
* Configuration of the wakeup event is board specific . For the
* moment we put it into this helper function . Later it may move
* to board specific files .
*/
static void omap_pm_wakeup_setup(void )
{
u32 level1_wake = 0 ;
u32 level2_wake = OMAP_IRQ_BIT(INT_UART2);
/*
* Turn off all interrupts except GPIO bank 1 , L1 - 2 nd level cascade ,
* and the L2 wakeup interrupts : keypad and UART2 . Note that the
* drivers must still separately call omap_set_gpio_wakeup ( ) to
* wake up to a GPIO interrupt .
*/
if (cpu_is_omap15xx())
level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
OMAP_IRQ_BIT(INT_1510_IH2_IRQ);
else if (cpu_is_omap16xx())
level1_wake = OMAP_IRQ_BIT(INT_GPIO_BANK1) |
OMAP_IRQ_BIT(INT_1610_IH2_IRQ);
omap_writel(~level1_wake, OMAP_IH1_MIR);
if (cpu_is_omap15xx()) {
level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
omap_writel(~level2_wake, OMAP_IH2_MIR);
} else if (cpu_is_omap16xx()) {
level2_wake |= OMAP_IRQ_BIT(INT_KEYBOARD);
omap_writel(~level2_wake, OMAP_IH2_0_MIR);
/* INT_1610_WAKE_UP_REQ is needed for GPIO wakeup... */
omap_writel(~OMAP_IRQ_BIT(INT_1610_WAKE_UP_REQ),
OMAP_IH2_1_MIR);
omap_writel(~0 x0, OMAP_IH2_2_MIR);
omap_writel(~0 x0, OMAP_IH2_3_MIR);
}
/* New IRQ agreement, recalculate in cascade order */
omap_writel(1 , OMAP_IH2_CONTROL);
omap_writel(1 , OMAP_IH1_CONTROL);
}
#define EN_DSPCK 13 /* ARM_CKCTL */
#define EN_APICK 6 /* ARM_IDLECT2 */
#define DSP_EN 1 /* ARM_RSTCT1 */
void omap1_pm_suspend(void )
{
unsigned long arg0 = 0 , arg1 = 0 ;
printk(KERN_INFO "PM: OMAP%x is trying to enter deep sleep...\n" ,
omap_rev());
omap_serial_wake_trigger(1 );
if (!cpu_is_omap15xx())
omap_writew(0 xffff, ULPD_SOFT_DISABLE_REQ_REG);
/*
* Step 1 : turn off interrupts ( FIXME : NOTE : already disabled )
*/
local_irq_disable();
local_fiq_disable();
/*
* Step 2 : save registers
*
* The omap is a strange / beautiful device . The caches , memory
* and register state are preserved across power saves .
* We have to save and restore very little register state to
* idle the omap .
*
* Save interrupt , MPUI , ARM and UPLD control registers .
*/
if (cpu_is_omap15xx()) {
MPUI1510_SAVE(OMAP_IH1_MIR);
MPUI1510_SAVE(OMAP_IH2_MIR);
MPUI1510_SAVE(MPUI_CTRL);
MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
MPUI1510_SAVE(EMIFS_CONFIG);
MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
} else if (cpu_is_omap16xx()) {
MPUI1610_SAVE(OMAP_IH1_MIR);
MPUI1610_SAVE(OMAP_IH2_0_MIR);
MPUI1610_SAVE(OMAP_IH2_1_MIR);
MPUI1610_SAVE(OMAP_IH2_2_MIR);
MPUI1610_SAVE(OMAP_IH2_3_MIR);
MPUI1610_SAVE(MPUI_CTRL);
MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
MPUI1610_SAVE(EMIFS_CONFIG);
MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
}
ARM_SAVE(ARM_CKCTL);
ARM_SAVE(ARM_IDLECT1);
ARM_SAVE(ARM_IDLECT2);
if (!(cpu_is_omap15xx()))
ARM_SAVE(ARM_IDLECT3);
ARM_SAVE(ARM_EWUPCT);
ARM_SAVE(ARM_RSTCT1);
ARM_SAVE(ARM_RSTCT2);
ARM_SAVE(ARM_SYSST);
ULPD_SAVE(ULPD_CLOCK_CTRL);
ULPD_SAVE(ULPD_STATUS_REQ);
/* (Step 3 removed - we now allow deep sleep by default) */
/*
* Step 4 : OMAP DSP Shutdown
*/
/* stop DSP */
omap_writew(omap_readw(ARM_RSTCT1) & ~(1 << DSP_EN), ARM_RSTCT1);
/* shut down dsp_ck */
omap_writew(omap_readw(ARM_CKCTL) & ~(1 << EN_DSPCK), ARM_CKCTL);
/* temporarily enabling api_ck to access DSP registers */
omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
/* save DSP registers */
DSP_SAVE(DSP_IDLECT2);
/* Stop all DSP domain clocks */
__raw_writew(0 , DSP_IDLECT2);
/*
* Step 5 : Wakeup Event Setup
*/
omap_pm_wakeup_setup();
/*
* Step 6 : ARM and Traffic controller shutdown
*/
/* disable ARM watchdog */
omap_writel(0 x00F5, OMAP_WDT_TIMER_MODE);
omap_writel(0 x00A0, OMAP_WDT_TIMER_MODE);
/*
* Step 6 b : ARM and Traffic controller shutdown
*
* Step 6 continues here . Prepare jump to power management
* assembly code in internal SRAM .
*
* Since the omap_cpu_suspend routine has been copied to
* SRAM , we ' ll do an indirect procedure call to it and pass the
* contents of arm_idlect1 and arm_idlect2 so it can restore
* them when it wakes up and it will return .
*/
arg0 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT1];
arg1 = arm_sleep_save[ARM_SLEEP_SAVE_ARM_IDLECT2];
/*
* Step 6 c : ARM and Traffic controller shutdown
*
* Jump to assembly code . The processor will stay there
* until wake up .
*/
omap_sram_suspend(arg0, arg1);
/*
* If we are here , processor is woken up !
*/
/*
* Restore DSP clocks
*/
/* again temporarily enabling api_ck to access DSP registers */
omap_writew(omap_readw(ARM_IDLECT2) | 1 << EN_APICK, ARM_IDLECT2);
/* Restore DSP domain clocks */
DSP_RESTORE(DSP_IDLECT2);
/*
* Restore ARM state , except ARM_IDLECT1 / 2 which omap_cpu_suspend did
*/
if (!(cpu_is_omap15xx()))
ARM_RESTORE(ARM_IDLECT3);
ARM_RESTORE(ARM_CKCTL);
ARM_RESTORE(ARM_EWUPCT);
ARM_RESTORE(ARM_RSTCT1);
ARM_RESTORE(ARM_RSTCT2);
ARM_RESTORE(ARM_SYSST);
ULPD_RESTORE(ULPD_CLOCK_CTRL);
ULPD_RESTORE(ULPD_STATUS_REQ);
if (cpu_is_omap15xx()) {
MPUI1510_RESTORE(MPUI_CTRL);
MPUI1510_RESTORE(MPUI_DSP_BOOT_CONFIG);
MPUI1510_RESTORE(MPUI_DSP_API_CONFIG);
MPUI1510_RESTORE(EMIFS_CONFIG);
MPUI1510_RESTORE(EMIFF_SDRAM_CONFIG);
MPUI1510_RESTORE(OMAP_IH1_MIR);
MPUI1510_RESTORE(OMAP_IH2_MIR);
} else if (cpu_is_omap16xx()) {
MPUI1610_RESTORE(MPUI_CTRL);
MPUI1610_RESTORE(MPUI_DSP_BOOT_CONFIG);
MPUI1610_RESTORE(MPUI_DSP_API_CONFIG);
MPUI1610_RESTORE(EMIFS_CONFIG);
MPUI1610_RESTORE(EMIFF_SDRAM_CONFIG);
MPUI1610_RESTORE(OMAP_IH1_MIR);
MPUI1610_RESTORE(OMAP_IH2_0_MIR);
MPUI1610_RESTORE(OMAP_IH2_1_MIR);
MPUI1610_RESTORE(OMAP_IH2_2_MIR);
MPUI1610_RESTORE(OMAP_IH2_3_MIR);
}
if (!cpu_is_omap15xx())
omap_writew(0 , ULPD_SOFT_DISABLE_REQ_REG);
/*
* Re - enable interrupts
*/
local_irq_enable();
local_fiq_enable();
omap_serial_wake_trigger(0 );
printk(KERN_INFO "PM: OMAP%x is re-starting from deep sleep...\n" ,
omap_rev());
}
#ifdef CONFIG_DEBUG_FS
/*
* Read system PM registers for debugging
*/
static int omap_pm_debug_show(struct seq_file *m, void *v)
{
ARM_SAVE(ARM_CKCTL);
ARM_SAVE(ARM_IDLECT1);
ARM_SAVE(ARM_IDLECT2);
if (!(cpu_is_omap15xx()))
ARM_SAVE(ARM_IDLECT3);
ARM_SAVE(ARM_EWUPCT);
ARM_SAVE(ARM_RSTCT1);
ARM_SAVE(ARM_RSTCT2);
ARM_SAVE(ARM_SYSST);
ULPD_SAVE(ULPD_IT_STATUS);
ULPD_SAVE(ULPD_CLOCK_CTRL);
ULPD_SAVE(ULPD_SOFT_REQ);
ULPD_SAVE(ULPD_STATUS_REQ);
ULPD_SAVE(ULPD_DPLL_CTRL);
ULPD_SAVE(ULPD_POWER_CTRL);
if (cpu_is_omap15xx()) {
MPUI1510_SAVE(MPUI_CTRL);
MPUI1510_SAVE(MPUI_DSP_STATUS);
MPUI1510_SAVE(MPUI_DSP_BOOT_CONFIG);
MPUI1510_SAVE(MPUI_DSP_API_CONFIG);
MPUI1510_SAVE(EMIFF_SDRAM_CONFIG);
MPUI1510_SAVE(EMIFS_CONFIG);
} else if (cpu_is_omap16xx()) {
MPUI1610_SAVE(MPUI_CTRL);
MPUI1610_SAVE(MPUI_DSP_STATUS);
MPUI1610_SAVE(MPUI_DSP_BOOT_CONFIG);
MPUI1610_SAVE(MPUI_DSP_API_CONFIG);
MPUI1610_SAVE(EMIFF_SDRAM_CONFIG);
MPUI1610_SAVE(EMIFS_CONFIG);
}
seq_printf(m,
"ARM_CKCTL_REG: 0x%-8x \n"
"ARM_IDLECT1_REG: 0x%-8x \n"
"ARM_IDLECT2_REG: 0x%-8x \n"
"ARM_IDLECT3_REG: 0x%-8x \n"
"ARM_EWUPCT_REG: 0x%-8x \n"
"ARM_RSTCT1_REG: 0x%-8x \n"
"ARM_RSTCT2_REG: 0x%-8x \n"
"ARM_SYSST_REG: 0x%-8x \n"
"ULPD_IT_STATUS_REG: 0x%-4x \n"
"ULPD_CLOCK_CTRL_REG: 0x%-4x \n"
"ULPD_SOFT_REQ_REG: 0x%-4x \n"
"ULPD_DPLL_CTRL_REG: 0x%-4x \n"
"ULPD_STATUS_REQ_REG: 0x%-4x \n"
"ULPD_POWER_CTRL_REG: 0x%-4x \n" ,
ARM_SHOW(ARM_CKCTL),
ARM_SHOW(ARM_IDLECT1),
ARM_SHOW(ARM_IDLECT2),
ARM_SHOW(ARM_IDLECT3),
ARM_SHOW(ARM_EWUPCT),
ARM_SHOW(ARM_RSTCT1),
ARM_SHOW(ARM_RSTCT2),
ARM_SHOW(ARM_SYSST),
ULPD_SHOW(ULPD_IT_STATUS),
ULPD_SHOW(ULPD_CLOCK_CTRL),
ULPD_SHOW(ULPD_SOFT_REQ),
ULPD_SHOW(ULPD_DPLL_CTRL),
ULPD_SHOW(ULPD_STATUS_REQ),
ULPD_SHOW(ULPD_POWER_CTRL));
if (cpu_is_omap15xx()) {
seq_printf(m,
"MPUI1510_CTRL_REG 0x%-8x \n"
"MPUI1510_DSP_STATUS_REG: 0x%-8x \n"
"MPUI1510_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
"MPUI1510_DSP_API_CONFIG_REG: 0x%-8x \n"
"MPUI1510_SDRAM_CONFIG_REG: 0x%-8x \n"
"MPUI1510_EMIFS_CONFIG_REG: 0x%-8x \n" ,
MPUI1510_SHOW(MPUI_CTRL),
MPUI1510_SHOW(MPUI_DSP_STATUS),
MPUI1510_SHOW(MPUI_DSP_BOOT_CONFIG),
MPUI1510_SHOW(MPUI_DSP_API_CONFIG),
MPUI1510_SHOW(EMIFF_SDRAM_CONFIG),
MPUI1510_SHOW(EMIFS_CONFIG));
} else if (cpu_is_omap16xx()) {
seq_printf(m,
"MPUI1610_CTRL_REG 0x%-8x \n"
"MPUI1610_DSP_STATUS_REG: 0x%-8x \n"
"MPUI1610_DSP_BOOT_CONFIG_REG: 0x%-8x \n"
"MPUI1610_DSP_API_CONFIG_REG: 0x%-8x \n"
"MPUI1610_SDRAM_CONFIG_REG: 0x%-8x \n"
"MPUI1610_EMIFS_CONFIG_REG: 0x%-8x \n" ,
MPUI1610_SHOW(MPUI_CTRL),
MPUI1610_SHOW(MPUI_DSP_STATUS),
MPUI1610_SHOW(MPUI_DSP_BOOT_CONFIG),
MPUI1610_SHOW(MPUI_DSP_API_CONFIG),
MPUI1610_SHOW(EMIFF_SDRAM_CONFIG),
MPUI1610_SHOW(EMIFS_CONFIG));
}
return 0 ;
}
DEFINE_SHOW_ATTRIBUTE(omap_pm_debug);
static void omap_pm_init_debugfs(void )
{
struct dentry *d;
d = debugfs_create_dir("pm_debug" , NULL);
debugfs_create_file("omap_pm" , S_IWUSR | S_IRUGO, d, NULL,
&omap_pm_debug_fops);
}
#endif /* CONFIG_DEBUG_FS */
/*
* omap_pm_prepare - Do preliminary suspend work .
*
*/
static int omap_pm_prepare(void )
{
/* We cannot sleep in idle until we have resumed */
cpu_idle_poll_ctrl(true );
return 0 ;
}
/*
* omap_pm_enter - Actually enter a sleep state .
* @ state : State we ' re entering .
*
*/
static int omap_pm_enter(suspend_state_t state)
{
switch (state)
{
case PM_SUSPEND_MEM:
omap1_pm_suspend();
break ;
default :
return -EINVAL;
}
return 0 ;
}
/**
* omap_pm_finish - Finish up suspend sequence .
*
* This is called after we wake back up ( or if entering the sleep state
* failed ) .
*/
static void omap_pm_finish(void )
{
cpu_idle_poll_ctrl(false );
}
static irqreturn_t omap_wakeup_interrupt(int irq, void *dev)
{
return IRQ_HANDLED;
}
static const struct platform_suspend_ops omap_pm_ops = {
.prepare = omap_pm_prepare,
.enter = omap_pm_enter,
.finish = omap_pm_finish,
.valid = suspend_valid_only_mem,
};
static int __init omap_pm_init(void )
{
int error = 0 ;
int irq;
if (!cpu_class_is_omap1())
return -ENODEV;
pr_info("Power Management for TI OMAP.\n" );
if (!IS_ENABLED(CONFIG_OMAP_32K_TIMER))
pr_info("OMAP1 PM: sleep states in idle disabled due to no 32KiHz timer\n" );
if (!IS_ENABLED(CONFIG_OMAP_DM_TIMER))
pr_info("OMAP1 PM: sleep states in idle disabled due to no DMTIMER support\n" );
if (IS_ENABLED(CONFIG_OMAP_32K_TIMER) &&
IS_ENABLED(CONFIG_OMAP_DM_TIMER)) {
/* OMAP16xx only */
pr_info("OMAP1 PM: sleep states in idle enabled\n" );
enable_dyn_sleep = 1 ;
}
/*
* We copy the assembler sleep / wakeup routines to SRAM .
* These routines need to be in SRAM as that ' s the only
* memory the MPU can see when it wakes up .
*/
if (cpu_is_omap15xx()) {
omap_sram_suspend = omap_sram_push(omap1510_cpu_suspend,
omap1510_cpu_suspend_sz);
} else if (cpu_is_omap16xx()) {
omap_sram_suspend = omap_sram_push(omap1610_cpu_suspend,
omap1610_cpu_suspend_sz);
}
if (omap_sram_suspend == NULL) {
printk(KERN_ERR "PM not initialized: Missing SRAM support\n" );
return -ENODEV;
}
arm_pm_idle = omap1_pm_idle;
if (cpu_is_omap16xx())
irq = INT_1610_WAKE_UP_REQ;
else
irq = -1 ;
if (irq >= 0 ) {
if (request_irq(irq, omap_wakeup_interrupt, 0 , "peripheral wakeup" , NULL))
pr_err("Failed to request irq %d (peripheral wakeup)\n" , irq);
}
/* Program new power ramp-up time
* ( 0 for most boards since we don ' t lower voltage when in deep sleep )
*/
omap_writew(ULPD_SETUP_ANALOG_CELL_3_VAL, ULPD_SETUP_ANALOG_CELL_3);
/* Setup ULPD POWER_CTRL_REG - enter deep sleep whenever possible */
omap_writew(ULPD_POWER_CTRL_REG_VAL, ULPD_POWER_CTRL);
/* Configure IDLECT3 */
if (cpu_is_omap16xx())
omap_writel(OMAP1610_IDLECT3_VAL, OMAP1610_IDLECT3);
suspend_set_ops(&omap_pm_ops);
#ifdef CONFIG_DEBUG_FS
omap_pm_init_debugfs();
#endif
error = sysfs_create_file(power_kobj, &sleep_while_idle_attr.attr);
if (error)
pr_err("sysfs_create_file failed: %d\n" , error);
if (cpu_is_omap16xx()) {
/* configure LOW_PWR pin */
omap_cfg_reg(T20_1610_LOW_PWR);
}
return error;
}
__initcall(omap_pm_init);
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