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// SPDX-License-Identifier: GPL-2.0+
/*
* Texas Instruments System Control Interface (TI SCI) power domain driver
*
* Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
* Andreas Dannenberg <dannenberg@ti.com>
*
* Loosely based on Linux kernel ti_sci_pm_domains.c...
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <power-domain-uclass.h>
#include <linux/soc/ti/ti_sci_protocol.h>
#include <dt-bindings/soc/ti,sci_pm_domain.h>
/**
* struct ti_sci_power_domain_data - pm domain controller information structure
* @sci: TI SCI handle used for communication with system controller
*/
struct ti_sci_power_domain_data {
const struct ti_sci_handle *sci;
};
static int ti_sci_power_domain_probe(struct udevice *dev)
{
struct ti_sci_power_domain_data *data = dev_get_priv(dev);
debug("%s(dev=%p)\n", __func__, dev);
if (!data)
return -ENOMEM;
/* Store handle for communication with the system controller */
data->sci = ti_sci_get_handle(dev);
if (IS_ERR(data->sci))
return PTR_ERR(data->sci);
return 0;
}
static int ti_sci_power_domain_request(struct power_domain *pd)
{
debug("%s(pd=%p)\n", __func__, pd);
return 0;
}
static int ti_sci_power_domain_free(struct power_domain *pd)
{
debug("%s(pd=%p)\n", __func__, pd);
return 0;
}
static int ti_sci_power_domain_on(struct power_domain *pd)
{
struct ti_sci_power_domain_data *data = dev_get_priv(pd->dev);
const struct ti_sci_handle *sci = data->sci;
const struct ti_sci_dev_ops *dops = &sci->ops.dev_ops;
u8 flags = (uintptr_t)pd->priv;
int ret;
debug("%s(pd=%p)\n", __func__, pd);
if (flags & TI_SCI_PD_EXCLUSIVE)
ret = dops->get_device_exclusive(sci, pd->id);
else
ret = dops->get_device(sci, pd->id);
if (ret)
dev_err(pd->dev, "%s: get_device(%lu) failed (%d)\n",
__func__, pd->id, ret);
return ret;
}
static int ti_sci_power_domain_off(struct power_domain *pd)
{
struct ti_sci_power_domain_data *data = dev_get_priv(pd->dev);
const struct ti_sci_handle *sci = data->sci;
const struct ti_sci_dev_ops *dops = &sci->ops.dev_ops;
int ret;
debug("%s(pd=%p)\n", __func__, pd);
ret = dops->put_device(sci, pd->id);
if (ret)
dev_err(pd->dev, "%s: put_device(%lu) failed (%d)\n",
__func__, pd->id, ret);
return ret;
}
static int ti_sci_power_domain_of_xlate(struct power_domain *pd,
struct ofnode_phandle_args *args)
{
u8 flags;
debug("%s(power_domain=%p)\n", __func__, pd);
if (args->args_count < 1) {
debug("Invalid args_count: %d\n", args->args_count);
return -EINVAL;
}
pd->id = args->args[0];
/* By default request for device exclusive */
flags = TI_SCI_PD_EXCLUSIVE;
if (args->args_count == 2)
flags = args->args[1] & TI_SCI_PD_EXCLUSIVE;
pd->priv = (void *)(uintptr_t)flags;
return 0;
}
static const struct udevice_id ti_sci_power_domain_of_match[] = {
{ .compatible = "ti,sci-pm-domain" },
{ /* sentinel */ }
};
static struct power_domain_ops ti_sci_power_domain_ops = {
.request = ti_sci_power_domain_request,
.rfree = ti_sci_power_domain_free,
.on = ti_sci_power_domain_on,
.off = ti_sci_power_domain_off,
.of_xlate = ti_sci_power_domain_of_xlate,
};
U_BOOT_DRIVER(ti_sci_pm_domains) = {
.name = "ti-sci-pm-domains",
.id = UCLASS_POWER_DOMAIN,
.of_match = ti_sci_power_domain_of_match,
.probe = ti_sci_power_domain_probe,
.priv_auto_alloc_size = sizeof(struct ti_sci_power_domain_data),
.ops = &ti_sci_power_domain_ops,
};
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