This adds a driver to control power domains on TI K3 SoCs. The driver is based on Linux-6.5-rc3.
Signed-off-by: Sascha Hauer <[email protected]> --- drivers/soc/Kconfig | 1 + drivers/soc/Makefile | 1 + drivers/soc/ti/Kconfig | 7 ++ drivers/soc/ti/Makefile | 1 + drivers/soc/ti/ti_sci_pm_domains.c | 196 +++++++++++++++++++++++++++++ 5 files changed, 206 insertions(+) create mode 100644 drivers/soc/ti/Kconfig create mode 100644 drivers/soc/ti/Makefile create mode 100644 drivers/soc/ti/ti_sci_pm_domains.c diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig index c0fe214429..cbde3c35a4 100644 --- a/drivers/soc/Kconfig +++ b/drivers/soc/Kconfig @@ -3,5 +3,6 @@ menu "SoC drivers" source "drivers/soc/imx/Kconfig" source "drivers/soc/kvx/Kconfig" source "drivers/soc/rockchip/Kconfig" +source "drivers/soc/ti/Kconfig" endmenu diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile index 9bff737b78..75ae4382ff 100644 --- a/drivers/soc/Makefile +++ b/drivers/soc/Makefile @@ -5,3 +5,4 @@ obj-$(CONFIG_KVX) += kvx/ obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/ obj-$(CONFIG_CPU_SIFIVE) += sifive/ obj-$(CONFIG_SOC_STARFIVE) += starfive/ +obj-y += ti/ diff --git a/drivers/soc/ti/Kconfig b/drivers/soc/ti/Kconfig new file mode 100644 index 0000000000..dc1ec3efb7 --- /dev/null +++ b/drivers/soc/ti/Kconfig @@ -0,0 +1,7 @@ +config TI_SCI_PM_DOMAINS + bool "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. diff --git a/drivers/soc/ti/Makefile b/drivers/soc/ti/Makefile new file mode 100644 index 0000000000..f87420e414 --- /dev/null +++ b/drivers/soc/ti/Makefile @@ -0,0 +1 @@ +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 0000000000..ab0a4d3829 --- /dev/null +++ b/drivers/soc/ti/ti_sci_pm_domains.c @@ -0,0 +1,196 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * TI SCI Generic Power Domain Driver + * + * Copyright (C) 2015-2017 Texas Instruments Incorporated - http://www.ti.com/ + * J Keerthy <[email protected]> + * Dave Gerlach <[email protected]> + */ + +#include <of_device.h> +#include <common.h> +#include <abort.h> +#include <malloc.h> +#include <io.h> +#include <init.h> +#include <pm_domain.h> +#include <soc/ti/ti_sci_protocol.h> +#include <dt-bindings/soc/ti,sci_pm_domain.h> + +/** + * struct ti_sci_genpd_provider: holds common TI SCI genpd provider data + * @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_list: list of all the power domains on the device + * @data: onecell data for genpd core + */ +struct ti_sci_genpd_provider { + const struct ti_sci_handle *ti_sci; + struct device *dev; + struct list_head pd_list; + struct genpd_onecell_data data; +}; + +/** + * struct ti_sci_pm_domain: TI specific data needed for power domain + * @idx: index of the device that identifies it with the system + * control processor. + * @exclusive: Permissions for exclusive request or shared request of the + * device. + * @pd: generic_pm_domain for use with the genpd framework + * @node: link for the genpd list + * @parent: link to the parent TI SCI genpd provider + */ +struct ti_sci_pm_domain { + int idx; + u8 exclusive; + struct generic_pm_domain pd; + struct list_head node; + struct ti_sci_genpd_provider *parent; +}; + +#define genpd_to_ti_sci_pd(gpd) container_of(gpd, struct ti_sci_pm_domain, pd) + +/* + * ti_sci_pd_power_off(): genpd power down hook + * @domain: pointer to the powerdomain to power off + */ +static int ti_sci_pd_power_off(struct generic_pm_domain *domain) +{ + struct ti_sci_pm_domain *pd = genpd_to_ti_sci_pd(domain); + const struct ti_sci_handle *ti_sci = pd->parent->ti_sci; + + return ti_sci->ops.dev_ops.put_device(ti_sci, pd->idx); +} + +/* + * ti_sci_pd_power_on(): genpd power up hook + * @domain: pointer to the powerdomain to power on + */ +static int ti_sci_pd_power_on(struct generic_pm_domain *domain) +{ + struct ti_sci_pm_domain *pd = genpd_to_ti_sci_pd(domain); + const struct ti_sci_handle *ti_sci = pd->parent->ti_sci; + + if (pd->exclusive) + return ti_sci->ops.dev_ops.get_device_exclusive(ti_sci, + pd->idx); + else + return ti_sci->ops.dev_ops.get_device(ti_sci, pd->idx); +} + +/* + * ti_sci_pd_xlate(): translation service for TI SCI genpds + * @genpdspec: DT identification data for the genpd + * @data: genpd core data for all the powerdomains on the device + */ +static struct generic_pm_domain *ti_sci_pd_xlate( + struct of_phandle_args *genpdspec, + void *data) +{ + struct genpd_onecell_data *genpd_data = data; + unsigned int idx = genpdspec->args[0]; + + if (genpdspec->args_count != 1 && genpdspec->args_count != 2) + return ERR_PTR(-EINVAL); + + if (idx >= genpd_data->num_domains) { + pr_err("%s: invalid domain index %u\n", __func__, idx); + return ERR_PTR(-EINVAL); + } + + if (!genpd_data->domains[idx]) + return ERR_PTR(-ENOENT); + + genpd_to_ti_sci_pd(genpd_data->domains[idx])->exclusive = + genpdspec->args[1]; + + return genpd_data->domains[idx]; +} + +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 device *dev) +{ + struct ti_sci_genpd_provider *pd_provider; + struct ti_sci_pm_domain *pd; + struct device_node *np = NULL; + struct of_phandle_args args; + int ret; + u32 max_id = 0; + int index; + + pd_provider = xzalloc(sizeof(*pd_provider)); + + pd_provider->ti_sci = ti_sci_get_handle(dev); + if (IS_ERR(pd_provider->ti_sci)) + return PTR_ERR(pd_provider->ti_sci); + + pd_provider->dev = dev; + + INIT_LIST_HEAD(&pd_provider->pd_list); + + /* Find highest device ID used for power domains */ + while (1) { + np = of_find_node_with_property(np, "power-domains"); + if (!np) + break; + + index = 0; + + while (1) { + ret = of_parse_phandle_with_args(np, "power-domains", + "#power-domain-cells", + index, &args); + if (ret) + break; + + if (args.args_count >= 1 && args.np == dev->of_node) { + if (args.args[0] > max_id) + max_id = args.args[0]; + + pd = xzalloc(sizeof(*pd)); + + pd->pd.name = basprintf("pd:%d", args.args[0]); + if (!pd->pd.name) + return -ENOMEM; + + pd->pd.power_off = ti_sci_pd_power_off; + pd->pd.power_on = ti_sci_pd_power_on; + pd->idx = args.args[0]; + pd->parent = pd_provider; + + pm_genpd_init(&pd->pd, NULL, true); + + list_add(&pd->node, &pd_provider->pd_list); + } + index++; + } + } + + pd_provider->data.domains = + xzalloc((max_id + 1) * sizeof(*pd_provider->data.domains)); + + pd_provider->data.num_domains = max_id + 1; + pd_provider->data.xlate = ti_sci_pd_xlate; + + list_for_each_entry(pd, &pd_provider->pd_list, node) + pd_provider->data.domains[pd->idx] = &pd->pd; + + return of_genpd_add_provider_onecell(dev->of_node, &pd_provider->data); +} + +static struct driver ti_sci_pm_domains_driver = { + .probe = ti_sci_pm_domain_probe, + .name = "ti_sci_pm_domains", + .of_match_table = ti_sci_pm_domain_matches, +}; +core_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"); -- 2.39.2
