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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 <log.h>
- #include <malloc.h>
- #include <power-domain-uclass.h>
- #include <dm/device_compat.h>
- #include <linux/err.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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