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// SPDX-License-Identifier: GPL-2.0-only OR MIT
/*
* Apple SoC PMGR device power state driver
*
* Copyright The Asahi Linux Contributors
*/
#include <linux/bitfield.h>
#include <linux/bitops.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#define APPLE_CLKGEN_PSTATE 0
#define APPLE_CLKGEN_PSTATE_DESIRED GENMASK(3, 0)
#define DCS_DEV_PSTATE_MIN_T600X 7
#define SYS_DEV_PSTATE_SUSPEND 1
enum sys_device {
DEV_FABRIC,
DEV_DCS,
DEV_MAX,
};
struct apple_pmgr_sys_device {
void __iomem *base;
u32 active_state;
u32 suspend_state;
};
struct apple_pmgr_misc_hw {
u32 dev_min_ps[DEV_MAX];
};
struct apple_pmgr_misc {
struct device *dev;
struct apple_pmgr_sys_device devices[DEV_MAX];
};
static void apple_pmgr_sys_dev_set_pstate(struct apple_pmgr_misc *misc,
enum sys_device dev, bool active)
{
u32 pstate;
u32 val;
if (!misc->devices[dev].base)
return;
if (active)
pstate = misc->devices[dev].active_state;
else
pstate = misc->devices[dev].suspend_state;
dev_dbg(misc->dev, "set %d ps to pstate %d\n", dev, pstate);
val = readl_relaxed(misc->devices[dev].base + APPLE_CLKGEN_PSTATE);
FIELD_MODIFY(APPLE_CLKGEN_PSTATE_DESIRED, &val, pstate);
writel_relaxed(val, misc->devices[dev].base + APPLE_CLKGEN_PSTATE);
}
static int __maybe_unused apple_pmgr_misc_suspend_noirq(struct device *dev)
{
struct apple_pmgr_misc *misc = dev_get_drvdata(dev);
int i;
for (i = 0; i < DEV_MAX; i++)
apple_pmgr_sys_dev_set_pstate(misc, i, false);
return 0;
}
static int __maybe_unused apple_pmgr_misc_resume_noirq(struct device *dev)
{
struct apple_pmgr_misc *misc = dev_get_drvdata(dev);
int i;
for (i = 0; i < DEV_MAX; i++)
apple_pmgr_sys_dev_set_pstate(misc, i, true);
return 0;
}
static int apple_pmgr_init_device(struct apple_pmgr_misc *misc,
const struct apple_pmgr_misc_hw *hw,
enum sys_device dev,
const char *device_name)
{
void __iomem *base;
char name[32];
u32 val;
snprintf(name, sizeof(name), "%s-ps", device_name);
base = devm_platform_ioremap_resource_byname(
to_platform_device(misc->dev), name);
if (IS_ERR(base))
return PTR_ERR(base);
val = readl_relaxed(base + APPLE_CLKGEN_PSTATE);
misc->devices[dev].base = base;
misc->devices[dev].active_state =
FIELD_GET(APPLE_CLKGEN_PSTATE_DESIRED, val);
misc->devices[dev].suspend_state = hw->dev_min_ps[dev];
return 0;
}
static int apple_pmgr_misc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
const struct apple_pmgr_misc_hw *hw;
struct apple_pmgr_misc *misc;
int ret;
misc = devm_kzalloc(dev, sizeof(*misc), GFP_KERNEL);
if (!misc)
return -ENOMEM;
misc->dev = dev;
hw = of_device_get_match_data(dev);
if (!hw)
return -EINVAL;
ret = apple_pmgr_init_device(misc, hw, DEV_FABRIC, "fabric");
if (ret)
return ret;
ret = apple_pmgr_init_device(misc, hw, DEV_DCS, "dcs");
if (ret)
return ret;
platform_set_drvdata(pdev, misc);
return 0;
}
static const struct apple_pmgr_misc_hw apple_pmgr_misc_hw_t600x = {
.dev_min_ps = {
[DEV_FABRIC] = SYS_DEV_PSTATE_SUSPEND,
[DEV_DCS] = DCS_DEV_PSTATE_MIN_T600X,
},
};
static const struct apple_pmgr_misc_hw apple_pmgr_misc_hw_t602x = {
.dev_min_ps = {
[DEV_FABRIC] = SYS_DEV_PSTATE_SUSPEND,
[DEV_DCS] = SYS_DEV_PSTATE_SUSPEND,
},
};
static const struct of_device_id apple_pmgr_misc_of_match[] = {
{ .compatible = "apple,t6000-pmgr-misc", .data = &apple_pmgr_misc_hw_t600x },
{ .compatible = "apple,t6020-pmgr-misc", .data = &apple_pmgr_misc_hw_t602x },
{}
};
MODULE_DEVICE_TABLE(of, apple_pmgr_misc_of_match);
static const struct dev_pm_ops apple_pmgr_misc_pm_ops = {
SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(apple_pmgr_misc_suspend_noirq,
apple_pmgr_misc_resume_noirq)
};
static struct platform_driver apple_pmgr_misc_driver = {
.probe = apple_pmgr_misc_probe,
.driver = {
.name = "apple-pmgr-misc",
.of_match_table = apple_pmgr_misc_of_match,
.pm = pm_ptr(&apple_pmgr_misc_pm_ops),
},
};
MODULE_AUTHOR("Hector Martin <marcan@marcan.st>");
MODULE_DESCRIPTION("PMGR misc driver for Apple SoCs");
MODULE_LICENSE("GPL");
module_platform_driver(apple_pmgr_misc_driver);
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