soc: ti: Add ti_sci_pm_domains driver (52835d59) · Commits · 戴 / test

MAINTAINERS

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		@@ -12384,6 +12384,7 @@ F: drivers/firmware/ti_sci*
		F: include/linux/soc/ti/ti_sci_protocol.h
		F: Documentation/devicetree/bindings/soc/ti/sci-pm-domain.txt
		F: include/dt-bindings/genpd/k2g.h
		F: drivers/soc/ti/ti_sci_pm_domains.c

		THANKO'S RAREMONO AM/FM/SW RADIO RECEIVER USB DRIVER
		M: Hans Verkuil <hverkuil@xs4all.nl>

arch/arm/mach-keystone/Kconfig

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		@@ -10,6 +10,7 @@ config ARCH_KEYSTONE
		select ARCH_SUPPORTS_BIG_ENDIAN
		select ZONE_DMA if ARM_LPAE
		select PINCTRL
		select PM_GENERIC_DOMAINS if PM
		help
		Support for boards based on the Texas Instruments Keystone family of
		SoCs.

drivers/soc/ti/Kconfig

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		@@ -38,4 +38,16 @@ config WKUP_M3_IPC
		to communicate and use the Wakeup M3 for PM features like suspend
		resume and boots it using wkup_m3_rproc driver.

		config TI_SCI_PM_DOMAINS
		tristate "TI SCI PM Domains Driver"
		depends on TI_SCI_PROTOCOL
		depends on PM_GENERIC_DOMAINS
		help
		Generic power domain implementation for TI device implementing
		the TI SCI protocol.

		To compile this as a module, choose M here. The module will be
		called ti_sci_pm_domains. Note this is needed early in boot before
		rootfs may be available.

		endif # SOC_TI

drivers/soc/ti/Makefile

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		@@ -5,3 +5,4 @@ obj-$(CONFIG_KEYSTONE_NAVIGATOR_QMSS) += knav_qmss.o
		knav_qmss-y := knav_qmss_queue.o knav_qmss_acc.o
		obj-$(CONFIG_KEYSTONE_NAVIGATOR_DMA) += knav_dma.o
		obj-$(CONFIG_WKUP_M3_IPC) += wkup_m3_ipc.o
		obj-$(CONFIG_TI_SCI_PM_DOMAINS) += ti_sci_pm_domains.o

drivers/soc/ti/ti_sci_pm_domains.c

0 → 100644

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		/*
		* TI SCI Generic Power Domain Driver
		*
		* Copyright (C) 2015-2017 Texas Instruments Incorporated - https://urldefense.proofpoint.com/v2/url?u=http-3A__www.ti.com_&d=DwIBAg&c=RoP1YumCXCgaWHvlZYR8PQcxBKCX5YTpkKY057SbK10&r=XBn1JQGPwR8CsE7xpP3wPlG6DQU7qw8ym65xieNZ4hY&m=R6qGiR9DbG1C3EF_0mL-m-qkmSO64GklbFWpUzqt8fY&s=YTWcQCWi5lnIf4XHDLq1XDd4JbZv9xpqOwdPD8xEdZE&e=
		* J Keerthy <j-keerthy@ti.com>
		* Dave Gerlach <d-gerlach@ti.com>
		*
		* This program is free software; you can redistribute it and/or
		* modify it under the terms of the GNU General Public License
		* version 2 as published by the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful,
		* but WITHOUT ANY WARRANTY; without even the implied warranty of
		* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
		* GNU General Public License for more details.
		*/

		#include <linux/err.h>
		#include <linux/module.h>
		#include <linux/mutex.h>
		#include <linux/of.h>
		#include <linux/platform_device.h>
		#include <linux/pm_domain.h>
		#include <linux/slab.h>
		#include <linux/soc/ti/ti_sci_protocol.h>

		/**
		* struct ti_sci_genpd_dev_data: holds data needed for every device attached
		* to this genpd
		* @idx: index of the device that identifies it with the system
		* control processor.
		*/
		struct ti_sci_genpd_dev_data {
		int idx;
		};

		/**
		* struct ti_sci_pm_domain: TI specific data needed for power domain
		* @ti_sci: handle to TI SCI protocol driver that provides ops to
		* communicate with system control processor.
		* @dev: pointer to dev for the driver for devm allocs
		* @pd: generic_pm_domain for use with the genpd framework
		*/
		struct ti_sci_pm_domain {
		const struct ti_sci_handle *ti_sci;
		struct device *dev;
		struct generic_pm_domain pd;
		};

		#define genpd_to_ti_sci_pd(gpd) container_of(gpd, struct ti_sci_pm_domain, pd)

		/**
		* ti_sci_dev_id(): get prepopulated ti_sci id from struct dev
		* @dev: pointer to device associated with this genpd
		*
		* Returns device_id stored from ti,sci_id property
		*/
		static int ti_sci_dev_id(struct device *dev)
		{
		struct generic_pm_domain_data *genpd_data = dev_gpd_data(dev);
		struct ti_sci_genpd_dev_data *sci_dev_data = genpd_data->data;

		return sci_dev_data->idx;
		}

		/**
		* ti_sci_dev_to_sci_handle(): get pointer to ti_sci_handle
		* @dev: pointer to device associated with this genpd
		*
		* Returns ti_sci_handle to be used to communicate with system
		* control processor.
		*/
		static const struct ti_sci_handle ti_sci_dev_to_sci_handle(struct device dev)
		{
		struct generic_pm_domain *pd = pd_to_genpd(dev->pm_domain);
		struct ti_sci_pm_domain *ti_sci_genpd = genpd_to_ti_sci_pd(pd);

		return ti_sci_genpd->ti_sci;
		}

		/**
		* ti_sci_dev_start(): genpd device start hook called to turn device on
		* @dev: pointer to device associated with this genpd to be powered on
		*/
		static int ti_sci_dev_start(struct device *dev)
		{
		const struct ti_sci_handle *ti_sci = ti_sci_dev_to_sci_handle(dev);
		int idx = ti_sci_dev_id(dev);

		return ti_sci->ops.dev_ops.get_device(ti_sci, idx);
		}

		/**
		* ti_sci_dev_stop(): genpd device stop hook called to turn device off
		* @dev: pointer to device associated with this genpd to be powered off
		*/
		static int ti_sci_dev_stop(struct device *dev)
		{
		const struct ti_sci_handle *ti_sci = ti_sci_dev_to_sci_handle(dev);
		int idx = ti_sci_dev_id(dev);

		return ti_sci->ops.dev_ops.put_device(ti_sci, idx);
		}

		static int ti_sci_pd_attach_dev(struct generic_pm_domain *domain,
		struct device *dev)
		{
		struct device_node *np = dev->of_node;
		struct of_phandle_args pd_args;
		struct ti_sci_pm_domain *ti_sci_genpd = genpd_to_ti_sci_pd(domain);
		const struct ti_sci_handle *ti_sci = ti_sci_genpd->ti_sci;
		struct ti_sci_genpd_dev_data *sci_dev_data;
		struct generic_pm_domain_data *genpd_data;
		int idx, ret = 0;

		ret = of_parse_phandle_with_args(np, "power-domains",
		"#power-domain-cells", 0, &pd_args);
		if (ret < 0)
		return ret;

		if (pd_args.args_count != 1)
		return -EINVAL;

		idx = pd_args.args[0];

		/*
		* Check the validity of the requested idx, if the index is not valid
		* the PMMC will return a NAK here and we will not allocate it.
		*/
		ret = ti_sci->ops.dev_ops.is_valid(ti_sci, idx);
		if (ret)
		return -EINVAL;

		sci_dev_data = kzalloc(sizeof(*sci_dev_data), GFP_KERNEL);
		if (!sci_dev_data)
		return -ENOMEM;

		sci_dev_data->idx = idx;

		genpd_data = dev_gpd_data(dev);
		genpd_data->data = sci_dev_data;

		return 0;
		}

		static void ti_sci_pd_detach_dev(struct generic_pm_domain *domain,
		struct device *dev)
		{
		struct generic_pm_domain_data *genpd_data = dev_gpd_data(dev);
		struct ti_sci_genpd_dev_data *sci_dev_data = genpd_data->data;

		kfree(sci_dev_data);
		genpd_data->data = NULL;
		}

		static const struct of_device_id ti_sci_pm_domain_matches[] = {
		{ .compatible = "ti,sci-pm-domain", },
		{ },
		};
		MODULE_DEVICE_TABLE(of, ti_sci_pm_domain_matches);

		static int ti_sci_pm_domain_probe(struct platform_device *pdev)
		{
		struct device *dev = &pdev->dev;
		struct device_node *np = dev->of_node;
		struct ti_sci_pm_domain *ti_sci_pd;
		int ret;

		ti_sci_pd = devm_kzalloc(dev, sizeof(*ti_sci_pd), GFP_KERNEL);
		if (!ti_sci_pd)
		return -ENOMEM;

		ti_sci_pd->ti_sci = devm_ti_sci_get_handle(dev);
		if (IS_ERR(ti_sci_pd->ti_sci))
		return PTR_ERR(ti_sci_pd->ti_sci);

		ti_sci_pd->dev = dev;

		ti_sci_pd->pd.attach_dev = ti_sci_pd_attach_dev;
		ti_sci_pd->pd.detach_dev = ti_sci_pd_detach_dev;

		ti_sci_pd->pd.dev_ops.start = ti_sci_dev_start;
		ti_sci_pd->pd.dev_ops.stop = ti_sci_dev_stop;

		pm_genpd_init(&ti_sci_pd->pd, NULL, true);

		ret = of_genpd_add_provider_simple(np, &ti_sci_pd->pd);

		return ret;
		}

		static struct platform_driver ti_sci_pm_domains_driver = {
		.probe = ti_sci_pm_domain_probe,
		.driver = {
		.name = "ti_sci_pm_domains",
		.of_match_table = ti_sci_pm_domain_matches,
		},
		};
		module_platform_driver(ti_sci_pm_domains_driver);
		MODULE_LICENSE("GPL v2");
		MODULE_DESCRIPTION("TI System Control Interface (SCI) Power Domain driver");
		MODULE_AUTHOR("Dave Gerlach");

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