linux/arch/arm/mach-mmp/pm-mmp2.c

251 lines
5.8 KiB
C

/*
* MMP2 Power Management Routines
*
* This software program is licensed subject to the GNU General Public License
* (GPL).Version 2,June 1991, available at http://www.fsf.org/copyleft/gpl.html
*
* (C) Copyright 2012 Marvell International Ltd.
* All Rights Reserved
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <linux/suspend.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <mach/cputype.h>
#include <mach/addr-map.h>
#include <mach/pm-mmp2.h>
#include <mach/regs-icu.h>
#include <mach/irqs.h>
int mmp2_set_wake(struct irq_data *d, unsigned int on)
{
unsigned long data = 0;
int irq = d->irq;
/* enable wakeup sources */
switch (irq) {
case IRQ_MMP2_RTC:
case IRQ_MMP2_RTC_ALARM:
data = MPMU_WUCRM_PJ_WAKEUP(4) | MPMU_WUCRM_PJ_RTC_ALARM;
break;
case IRQ_MMP2_PMIC:
data = MPMU_WUCRM_PJ_WAKEUP(7);
break;
case IRQ_MMP2_MMC2:
/* mmc use WAKEUP2, same as GPIO wakeup source */
data = MPMU_WUCRM_PJ_WAKEUP(2);
break;
}
if (on) {
if (data) {
data |= __raw_readl(MPMU_WUCRM_PJ);
__raw_writel(data, MPMU_WUCRM_PJ);
}
} else {
if (data) {
data = ~data & __raw_readl(MPMU_WUCRM_PJ);
__raw_writel(data, MPMU_WUCRM_PJ);
}
}
return 0;
}
static void pm_scu_clk_disable(void)
{
unsigned int val;
/* close AXI fabric clock gate */
__raw_writel(0x0, CIU_REG(0x64));
__raw_writel(0x0, CIU_REG(0x68));
/* close MCB master clock gate */
val = __raw_readl(CIU_REG(0x1c));
val |= 0xf0;
__raw_writel(val, CIU_REG(0x1c));
return ;
}
static void pm_scu_clk_enable(void)
{
unsigned int val;
/* open AXI fabric clock gate */
__raw_writel(0x03003003, CIU_REG(0x64));
__raw_writel(0x00303030, CIU_REG(0x68));
/* open MCB master clock gate */
val = __raw_readl(CIU_REG(0x1c));
val &= ~(0xf0);
__raw_writel(val, CIU_REG(0x1c));
return ;
}
static void pm_mpmu_clk_disable(void)
{
/*
* disable clocks in MPMU_CGR_PJ register
* except clock for APMU_PLL1, APMU_PLL1_2 and AP_26M
*/
__raw_writel(0x0000a010, MPMU_CGR_PJ);
}
static void pm_mpmu_clk_enable(void)
{
unsigned int val;
__raw_writel(0xdffefffe, MPMU_CGR_PJ);
val = __raw_readl(MPMU_PLL2_CTRL1);
val |= (1 << 29);
__raw_writel(val, MPMU_PLL2_CTRL1);
return ;
}
void mmp2_pm_enter_lowpower_mode(int state)
{
uint32_t idle_cfg, apcr;
idle_cfg = __raw_readl(APMU_PJ_IDLE_CFG);
apcr = __raw_readl(MPMU_PCR_PJ);
apcr &= ~(MPMU_PCR_PJ_SLPEN | MPMU_PCR_PJ_DDRCORSD | MPMU_PCR_PJ_APBSD
| MPMU_PCR_PJ_AXISD | MPMU_PCR_PJ_VCTCXOSD | (1 << 13));
idle_cfg &= ~APMU_PJ_IDLE_CFG_PJ_IDLE;
switch (state) {
case POWER_MODE_SYS_SLEEP:
apcr |= MPMU_PCR_PJ_SLPEN; /* set the SLPEN bit */
apcr |= MPMU_PCR_PJ_VCTCXOSD; /* set VCTCXOSD */
/* fall through */
case POWER_MODE_CHIP_SLEEP:
apcr |= MPMU_PCR_PJ_SLPEN;
/* fall through */
case POWER_MODE_APPS_SLEEP:
apcr |= MPMU_PCR_PJ_APBSD; /* set APBSD */
/* fall through */
case POWER_MODE_APPS_IDLE:
apcr |= MPMU_PCR_PJ_AXISD; /* set AXISDD bit */
apcr |= MPMU_PCR_PJ_DDRCORSD; /* set DDRCORSD bit */
idle_cfg |= APMU_PJ_IDLE_CFG_PJ_PWRDWN; /* PJ power down */
apcr |= MPMU_PCR_PJ_SPSD;
/* fall through */
case POWER_MODE_CORE_EXTIDLE:
idle_cfg |= APMU_PJ_IDLE_CFG_PJ_IDLE; /* set the IDLE bit */
idle_cfg &= ~APMU_PJ_IDLE_CFG_ISO_MODE_CNTRL_MASK;
idle_cfg |= APMU_PJ_IDLE_CFG_PWR_SW(3)
| APMU_PJ_IDLE_CFG_L2_PWR_SW;
break;
case POWER_MODE_CORE_INTIDLE:
apcr &= ~MPMU_PCR_PJ_SPSD;
break;
}
/* set reserve bits */
apcr |= (1 << 30) | (1 << 25);
/* finally write the registers back */
__raw_writel(idle_cfg, APMU_PJ_IDLE_CFG);
__raw_writel(apcr, MPMU_PCR_PJ); /* 0xfe086000 */
}
static int mmp2_pm_enter(suspend_state_t state)
{
int temp;
temp = __raw_readl(MMP2_ICU_INT4_MASK);
if (temp & (1 << 1)) {
printk(KERN_ERR "%s: PMIC interrupt is handling\n", __func__);
return -EAGAIN;
}
temp = __raw_readl(APMU_SRAM_PWR_DWN);
temp |= ((1 << 19) | (1 << 18));
__raw_writel(temp, APMU_SRAM_PWR_DWN);
pm_mpmu_clk_disable();
pm_scu_clk_disable();
printk(KERN_INFO "%s: before suspend\n", __func__);
cpu_do_idle();
printk(KERN_INFO "%s: after suspend\n", __func__);
pm_mpmu_clk_enable(); /* enable clocks in MPMU */
pm_scu_clk_enable(); /* enable clocks in SCU */
return 0;
}
/*
* Called after processes are frozen, but before we shut down devices.
*/
static int mmp2_pm_prepare(void)
{
mmp2_pm_enter_lowpower_mode(POWER_MODE_SYS_SLEEP);
return 0;
}
/*
* Called after devices are re-setup, but before processes are thawed.
*/
static void mmp2_pm_finish(void)
{
mmp2_pm_enter_lowpower_mode(POWER_MODE_CORE_INTIDLE);
}
static int mmp2_pm_valid(suspend_state_t state)
{
return ((state == PM_SUSPEND_STANDBY) || (state == PM_SUSPEND_MEM));
}
/*
* Set to PM_DISK_FIRMWARE so we can quickly veto suspend-to-disk.
*/
static const struct platform_suspend_ops mmp2_pm_ops = {
.valid = mmp2_pm_valid,
.prepare = mmp2_pm_prepare,
.enter = mmp2_pm_enter,
.finish = mmp2_pm_finish,
};
static int __init mmp2_pm_init(void)
{
uint32_t apcr;
if (!cpu_is_mmp2())
return -EIO;
suspend_set_ops(&mmp2_pm_ops);
/*
* Set bit 0, Slow clock Select 32K clock input instead of VCXO
* VCXO is chosen by default, which would be disabled in suspend
*/
__raw_writel(0x5, MPMU_SCCR);
/*
* Clear bit 23 of CIU_CPU_CONF
* direct PJ4 to DDR access through Memory Controller slow queue
* fast queue has issue and cause lcd will flick
*/
__raw_writel(__raw_readl(CIU_REG(0x8)) & ~(0x1 << 23), CIU_REG(0x8));
/* Clear default low power control bit */
apcr = __raw_readl(MPMU_PCR_PJ);
apcr &= ~(MPMU_PCR_PJ_SLPEN | MPMU_PCR_PJ_DDRCORSD
| MPMU_PCR_PJ_APBSD | MPMU_PCR_PJ_AXISD | 1 << 13);
__raw_writel(apcr, MPMU_PCR_PJ);
return 0;
}
late_initcall(mmp2_pm_init);