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/*
* RCPM(Run Control/Power Management) support
*
* Copyright 2012 Freescale Semiconductor Inc.
*
* 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.
*/
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/suspend.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/of_address.h>
#include <linux/of_platform.h>
#include <linux/export.h>
#include <asm/io.h>
#include <asm/cacheflush.h>
#include <asm/fsl_guts.h>
struct ccsr_rcpm __iomem *rcpm1_regs;
struct ccsr_rcpm_v2 __iomem *rcpm2_regs;
static int rcpm_suspend_enter(suspend_state_t state)
{
int ret = 0;
int result;
switch (state) {
case PM_SUSPEND_STANDBY:
flush_dcache_L1();
flush_backside_L2_cache();
setbits32(&rcpm1_regs->powmgtcsr, RCPM_POWMGTCSR_SLP);
/* At this point, the device is in sleep mode. */
/* Upon resume, wait for SLP bit to be clear. */
result = spin_event_timeout(
(in_be32(&rcpm1_regs->powmgtcsr) & RCPM_POWMGTCSR_SLP) == 0,
10000, 10);
if (!result) {
pr_err("%s: timeout waiting for SLP bit "
"to be cleared\n", __func__);
ret = -ETIMEDOUT;
}
break;
default:
ret = -EINVAL;
}
return ret;
}
static int rcpm_v2_suspend_enter(suspend_state_t state)
{
int ret = 0;
int result;
switch (state) {
case PM_SUSPEND_STANDBY:
/* clear previous LPM20 status */
setbits32(&rcpm2_regs->powmgtcsr, RCPM_POWMGTCSR_P_LPM20_ST);
/* enter LPM20 status */
setbits32(&rcpm2_regs->powmgtcsr, RCPM_POWMGTCSR_LPM20_RQ);
/* At this point, the device is in LPM20 status. */
/* resume ... */
result = spin_event_timeout(
(in_be32(&rcpm2_regs->powmgtcsr) & RCPM_POWMGTCSR_LPM20_ST)
== 0, 10000, 10);
if (!result) {
pr_err("%s: timeout waiting for LPM20 bit to be cleared\n",
__func__);
ret = -ETIMEDOUT;
}
break;
default:
ret = -EINVAL;
}
return ret;
}
static int rcpm_suspend_valid(suspend_state_t state)
{
if (state == PM_SUSPEND_STANDBY)
return 1;
else
return 0;
}
static struct platform_suspend_ops rcpm_suspend_ops = {
.valid = rcpm_suspend_valid,
};
static int rcpm_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
if (of_device_is_compatible(np, "fsl,qoriq-rcpm-2.0")) {
rcpm2_regs = of_iomap(np, 0);
if (!rcpm2_regs)
return -ENOMEM;
rcpm_suspend_ops.enter = rcpm_v2_suspend_enter;
} else {
rcpm1_regs= of_iomap(np, 0);
if (!rcpm1_regs)
return -ENOMEM;
rcpm_suspend_ops.enter = rcpm_suspend_enter;
}
suspend_set_ops(&rcpm_suspend_ops);
dev_info(&pdev->dev, "Freescale RCPM driver\n");
return 0;
}
static const struct of_device_id rcpm_ids[] = {
{ .compatible = "fsl,qoriq-rcpm-1.0", },
{ .compatible = "fsl,qoriq-rcpm-2.0", },
{ },
};
static struct platform_driver rcpm_driver = {
.driver = {
.name = "fsl-rcpm",
.owner = THIS_MODULE,
.of_match_table = rcpm_ids,
},
.probe = rcpm_probe,
};
static int __init rcpm_init(void)
{
return platform_driver_register(&rcpm_driver);
}
device_initcall(rcpm_init);
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