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https://github.com/brain-hackers/u-boot-brain
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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
141 lines
3.4 KiB
C
141 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 = 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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