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cd041c8041
TISCI protocol supports for enabling the device either with exclusive permissions for the requesting host or with sharing across the hosts. There are certain devices which are exclusive to Linux context and there are certain devices that are shared across different host contexts. So add support for getting this information from DT by increasing the power-domain cells to 2. For keeping the DT backward compatibility intact, defaulting the device permissions to set the exclusive flag set. In this case the power-domain-cells is 1. Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
137 lines
3.3 KiB
C
137 lines
3.3 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 <power-domain-uclass.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(power_domain->dev, "%s: get_device failed (%d)\n",
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__func__, 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(power_domain->dev, "%s: put_device failed (%d)\n",
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__func__, 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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.free = 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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