Dave Gerlach <d-gerlach@xxxxxx> writes: > Introduce a ti_sci_pm_domains driver to act as a generic pm domain > provider to allow each device to attach and associate it's ti-sci-id so > that it can be controlled through the TI SCI protocol. > > This driver implements a simple genpd where each device node has a > phandle to the power domain node and also must provide an index which > represents the ID to be passed with TI SCI representing the device using > a single phandle cell. The driver manually parses the phandle to get the > cell value. Through this interface the genpd dev_ops start and stop > hooks will use TI SCI to turn on and off each device as determined by > pm_runtime usage. > > Signed-off-by: Keerthy <j-keerthy@xxxxxx> > Signed-off-by: Nishanth Menon <nm@xxxxxx> > Signed-off-by: Dave Gerlach <d-gerlach@xxxxxx> Reviewed-by: Kevin Hilman <khilman@xxxxxxxxxxxx> > --- > v3->v4: > Parse phandle directly instead of reading ti,sci-id property per device. > > MAINTAINERS | 1 + > arch/arm/mach-keystone/Kconfig | 1 + > drivers/soc/ti/Kconfig | 12 +++ > drivers/soc/ti/Makefile | 1 + > drivers/soc/ti/ti_sci_pm_domains.c | 202 +++++++++++++++++++++++++++++++++++++ > 5 files changed, 217 insertions(+) > create mode 100644 drivers/soc/ti/ti_sci_pm_domains.c > > diff --git a/MAINTAINERS b/MAINTAINERS > index aaf96a9b4cd4..5cce85ade551 100644 > --- a/MAINTAINERS > +++ b/MAINTAINERS > @@ -12385,6 +12385,7 @@ 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@xxxxxxxxx> > diff --git a/arch/arm/mach-keystone/Kconfig b/arch/arm/mach-keystone/Kconfig > index 554357035f30..db122356b410 100644 > --- a/arch/arm/mach-keystone/Kconfig > +++ b/arch/arm/mach-keystone/Kconfig > @@ -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. > diff --git a/drivers/soc/ti/Kconfig b/drivers/soc/ti/Kconfig > index 3557c5e32a93..39e152abe6b9 100644 > --- a/drivers/soc/ti/Kconfig > +++ b/drivers/soc/ti/Kconfig > @@ -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 > diff --git a/drivers/soc/ti/Makefile b/drivers/soc/ti/Makefile > index 48ff3a79634f..7d572736c86e 100644 > --- a/drivers/soc/ti/Makefile > +++ b/drivers/soc/ti/Makefile > @@ -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 > diff --git a/drivers/soc/ti/ti_sci_pm_domains.c b/drivers/soc/ti/ti_sci_pm_domains.c > new file mode 100644 > index 000000000000..b0b283810e72 > --- /dev/null > +++ b/drivers/soc/ti/ti_sci_pm_domains.c > @@ -0,0 +1,202 @@ > +/* > + * TI SCI Generic Power Domain Driver > + * > + * Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/ > + * J Keerthy <j-keerthy@xxxxxx> > + * Dave Gerlach <d-gerlach@xxxxxx> > + * > + * 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"); -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
