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