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// SPDX-License-Identifier: GPL-2.0
/*
* Xilinx Zynq MPSoC Power Management
*
* Copyright (C) 2014-2018 Xilinx, Inc.
*
* Davorin Mista <davorin.mista@aggios.com>
* Jolly Shah <jollys@xilinx.com>
* Rajan Vaja <rajan.vaja@xilinx.com>
*/
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/suspend.h>
#include <linux/firmware/xlnx-zynqmp.h>
enum pm_suspend_mode {
PM_SUSPEND_MODE_FIRST = 0,
PM_SUSPEND_MODE_STD = PM_SUSPEND_MODE_FIRST,
PM_SUSPEND_MODE_POWER_OFF,
};
#define PM_SUSPEND_MODE_FIRST PM_SUSPEND_MODE_STD
static const char *const suspend_modes[] = {
[PM_SUSPEND_MODE_STD] = "standard",
[PM_SUSPEND_MODE_POWER_OFF] = "power-off",
};
static enum pm_suspend_mode suspend_mode = PM_SUSPEND_MODE_STD;
static const struct zynqmp_eemi_ops *eemi_ops;
enum pm_api_cb_id {
PM_INIT_SUSPEND_CB = 30,
PM_ACKNOWLEDGE_CB,
PM_NOTIFY_CB,
};
static void zynqmp_pm_get_callback_data(u32 *buf)
{
zynqmp_pm_invoke_fn(GET_CALLBACK_DATA, 0, 0, 0, 0, buf);
}
static irqreturn_t zynqmp_pm_isr(int irq, void *data)
{
u32 payload[CB_PAYLOAD_SIZE];
zynqmp_pm_get_callback_data(payload);
/* First element is callback API ID, others are callback arguments */
if (payload[0] == PM_INIT_SUSPEND_CB) {
switch (payload[1]) {
case SUSPEND_SYSTEM_SHUTDOWN:
orderly_poweroff(true);
break;
case SUSPEND_POWER_REQUEST:
pm_suspend(PM_SUSPEND_MEM);
break;
default:
pr_err("%s Unsupported InitSuspendCb reason "
"code %d\n", __func__, payload[1]);
}
}
return IRQ_HANDLED;
}
static ssize_t suspend_mode_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
char *s = buf;
int md;
for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++)
if (suspend_modes[md]) {
if (md == suspend_mode)
s += sprintf(s, "[%s] ", suspend_modes[md]);
else
s += sprintf(s, "%s ", suspend_modes[md]);
}
/* Convert last space to newline */
if (s != buf)
*(s - 1) = '\n';
return (s - buf);
}
static ssize_t suspend_mode_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
int md, ret = -EINVAL;
if (!eemi_ops->set_suspend_mode)
return ret;
for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++)
if (suspend_modes[md] &&
sysfs_streq(suspend_modes[md], buf)) {
ret = 0;
break;
}
if (!ret && md != suspend_mode) {
ret = eemi_ops->set_suspend_mode(md);
if (likely(!ret))
suspend_mode = md;
}
return ret ? ret : count;
}
static DEVICE_ATTR_RW(suspend_mode);
static int zynqmp_pm_probe(struct platform_device *pdev)
{
int ret, irq;
u32 pm_api_version;
eemi_ops = zynqmp_pm_get_eemi_ops();
if (IS_ERR(eemi_ops))
return PTR_ERR(eemi_ops);
if (!eemi_ops->get_api_version || !eemi_ops->init_finalize)
return -ENXIO;
eemi_ops->init_finalize();
eemi_ops->get_api_version(&pm_api_version);
/* Check PM API version number */
if (pm_api_version < ZYNQMP_PM_VERSION)
return -ENODEV;
irq = platform_get_irq(pdev, 0);
if (irq <= 0)
return -ENXIO;
ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, zynqmp_pm_isr,
IRQF_NO_SUSPEND | IRQF_ONESHOT,
dev_name(&pdev->dev), &pdev->dev);
if (ret) {
dev_err(&pdev->dev, "devm_request_threaded_irq '%d' failed "
"with %d\n", irq, ret);
return ret;
}
ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
if (ret) {
dev_err(&pdev->dev, "unable to create sysfs interface\n");
return ret;
}
return 0;
}
static int zynqmp_pm_remove(struct platform_device *pdev)
{
sysfs_remove_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
return 0;
}
static const struct of_device_id pm_of_match[] = {
{ .compatible = "xlnx,zynqmp-power", },
{ /* end of table */ },
};
MODULE_DEVICE_TABLE(of, pm_of_match);
static struct platform_driver zynqmp_pm_platform_driver = {
.probe = zynqmp_pm_probe,
.remove = zynqmp_pm_remove,
.driver = {
.name = "zynqmp_power",
.of_match_table = pm_of_match,
},
};
module_platform_driver(zynqmp_pm_platform_driver);
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