forked from Minki/linux
b13b9e98b8
outer_disable() is defined to safely turn the L2 cache off without data loss: this means that outer_flush_all() should never be called unless you need to implement some special L2 cache disabling, and even then only from your replacement L2 cache disable function. Acked-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
155 lines
3.4 KiB
C
155 lines
3.4 KiB
C
/*
|
|
* power management entry for CSR SiRFprimaII
|
|
*
|
|
* Copyright (c) 2011 Cambridge Silicon Radio Limited, a CSR plc group company.
|
|
*
|
|
* Licensed under GPLv2 or later.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/suspend.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/export.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/io.h>
|
|
#include <linux/rtc/sirfsoc_rtciobrg.h>
|
|
#include <asm/suspend.h>
|
|
#include <asm/hardware/cache-l2x0.h>
|
|
|
|
#include "pm.h"
|
|
|
|
/*
|
|
* suspend asm codes will access these to make DRAM become self-refresh and
|
|
* system sleep
|
|
*/
|
|
u32 sirfsoc_pwrc_base;
|
|
void __iomem *sirfsoc_memc_base;
|
|
|
|
static void sirfsoc_set_wakeup_source(void)
|
|
{
|
|
u32 pwr_trigger_en_reg;
|
|
pwr_trigger_en_reg = sirfsoc_rtc_iobrg_readl(sirfsoc_pwrc_base +
|
|
SIRFSOC_PWRC_TRIGGER_EN);
|
|
#define X_ON_KEY_B (1 << 0)
|
|
#define RTC_ALARM0_B (1 << 2)
|
|
#define RTC_ALARM1_B (1 << 3)
|
|
sirfsoc_rtc_iobrg_writel(pwr_trigger_en_reg | X_ON_KEY_B |
|
|
RTC_ALARM0_B | RTC_ALARM1_B,
|
|
sirfsoc_pwrc_base + SIRFSOC_PWRC_TRIGGER_EN);
|
|
}
|
|
|
|
static void sirfsoc_set_sleep_mode(u32 mode)
|
|
{
|
|
u32 sleep_mode = sirfsoc_rtc_iobrg_readl(sirfsoc_pwrc_base +
|
|
SIRFSOC_PWRC_PDN_CTRL);
|
|
sleep_mode &= ~(SIRFSOC_SLEEP_MODE_MASK << 1);
|
|
sleep_mode |= mode << 1;
|
|
sirfsoc_rtc_iobrg_writel(sleep_mode, sirfsoc_pwrc_base +
|
|
SIRFSOC_PWRC_PDN_CTRL);
|
|
}
|
|
|
|
static int sirfsoc_pre_suspend_power_off(void)
|
|
{
|
|
u32 wakeup_entry = virt_to_phys(cpu_resume);
|
|
|
|
sirfsoc_rtc_iobrg_writel(wakeup_entry, sirfsoc_pwrc_base +
|
|
SIRFSOC_PWRC_SCRATCH_PAD1);
|
|
|
|
sirfsoc_set_wakeup_source();
|
|
|
|
sirfsoc_set_sleep_mode(SIRFSOC_DEEP_SLEEP_MODE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sirfsoc_pm_enter(suspend_state_t state)
|
|
{
|
|
switch (state) {
|
|
case PM_SUSPEND_MEM:
|
|
sirfsoc_pre_suspend_power_off();
|
|
|
|
outer_disable();
|
|
/* go zzz */
|
|
cpu_suspend(0, sirfsoc_finish_suspend);
|
|
outer_resume();
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_suspend_ops sirfsoc_pm_ops = {
|
|
.enter = sirfsoc_pm_enter,
|
|
.valid = suspend_valid_only_mem,
|
|
};
|
|
|
|
static const struct of_device_id pwrc_ids[] = {
|
|
{ .compatible = "sirf,prima2-pwrc" },
|
|
{}
|
|
};
|
|
|
|
static int __init sirfsoc_of_pwrc_init(void)
|
|
{
|
|
struct device_node *np;
|
|
|
|
np = of_find_matching_node(NULL, pwrc_ids);
|
|
if (!np) {
|
|
pr_err("unable to find compatible sirf pwrc node in dtb\n");
|
|
return -ENOENT;
|
|
}
|
|
|
|
/*
|
|
* pwrc behind rtciobrg is not located in memory space
|
|
* though the property is named reg. reg only means base
|
|
* offset for pwrc. then of_iomap is not suitable here.
|
|
*/
|
|
if (of_property_read_u32(np, "reg", &sirfsoc_pwrc_base))
|
|
panic("unable to find base address of pwrc node in dtb\n");
|
|
|
|
of_node_put(np);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id memc_ids[] = {
|
|
{ .compatible = "sirf,prima2-memc" },
|
|
{}
|
|
};
|
|
|
|
static int sirfsoc_memc_probe(struct platform_device *op)
|
|
{
|
|
struct device_node *np = op->dev.of_node;
|
|
|
|
sirfsoc_memc_base = of_iomap(np, 0);
|
|
if (!sirfsoc_memc_base)
|
|
panic("unable to map memc registers\n");
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver sirfsoc_memc_driver = {
|
|
.probe = sirfsoc_memc_probe,
|
|
.driver = {
|
|
.name = "sirfsoc-memc",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = memc_ids,
|
|
},
|
|
};
|
|
|
|
static int __init sirfsoc_memc_init(void)
|
|
{
|
|
return platform_driver_register(&sirfsoc_memc_driver);
|
|
}
|
|
|
|
int __init sirfsoc_pm_init(void)
|
|
{
|
|
sirfsoc_of_pwrc_init();
|
|
sirfsoc_memc_init();
|
|
suspend_set_ops(&sirfsoc_pm_ops);
|
|
return 0;
|
|
}
|