69 lines
1.5 KiB
C
69 lines
1.5 KiB
C
|
// SPDX-License-Identifier: GPL-2.0-only
|
||
|
|
/*
|
||
|
|
* Power Management driver for Marvell Kirkwood SoCs
|
||
|
|
*
|
||
|
|
* Copyright (C) 2013 Ezequiel Garcia <ezequiel@free-electrons.com>
|
||
|
|
* Copyright (C) 2010 Simon Guinot <sguinot@lacie.com>
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <linux/kernel.h>
|
||
|
|
#include <linux/suspend.h>
|
||
|
|
#include <linux/io.h>
|
||
|
|
#include "kirkwood.h"
|
||
|
|
#include "kirkwood-pm.h"
|
||
|
|
|
||
|
|
static void __iomem *ddr_operation_base;
|
||
|
|
static void __iomem *memory_pm_ctrl;
|
||
|
|
|
||
|
|
static void kirkwood_low_power(void)
|
||
|
|
{
|
||
|
|
u32 mem_pm_ctrl;
|
||
|
|
|
||
|
|
mem_pm_ctrl = readl(memory_pm_ctrl);
|
||
|
|
|
||
|
|
/* Set peripherals to low-power mode */
|
||
|
|
writel_relaxed(~0, memory_pm_ctrl);
|
||
|
|
|
||
|
|
/* Set DDR in self-refresh */
|
||
|
|
writel_relaxed(0x7, ddr_operation_base);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Set CPU in wait-for-interrupt state.
|
||
|
|
* This disables the CPU core clocks,
|
||
|
|
* the array clocks, and also the L2 controller.
|
||
|
|
*/
|
||
|
|
cpu_do_idle();
|
||
|
|
|
||
|
|
writel_relaxed(mem_pm_ctrl, memory_pm_ctrl);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int kirkwood_suspend_enter(suspend_state_t state)
|
||
|
|
{
|
||
|
|
switch (state) {
|
||
|
|
case PM_SUSPEND_STANDBY:
|
||
|
|
kirkwood_low_power();
|
||
|
|
break;
|
||
|
|
default:
|
||
|
|
return -EINVAL;
|
||
|
|
}
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int kirkwood_pm_valid_standby(suspend_state_t state)
|
||
|
|
{
|
||
|
|
return state == PM_SUSPEND_STANDBY;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct platform_suspend_ops kirkwood_suspend_ops = {
|
||
|
|
.enter = kirkwood_suspend_enter,
|
||
|
|
.valid = kirkwood_pm_valid_standby,
|
||
|
|
};
|
||
|
|
|
||
|
|
void __init kirkwood_pm_init(void)
|
||
|
|
{
|
||
|
|
ddr_operation_base = ioremap(DDR_OPERATION_BASE, 4);
|
||
|
|
memory_pm_ctrl = ioremap(MEMORY_PM_CTRL_PHYS, 4);
|
||
|
|
|
||
|
|
suspend_set_ops(&kirkwood_suspend_ops);
|
||
|
|
}
|