From: Jolly Shah <[email protected]> The zynqmp-genpd driver communicates the usage requirements for logical power domains / devices to the platform FW. FW is responsible for choosing appropriate power states, taking Linux' usage information into account.
Signed-off-by: Rajan Vaja <[email protected]> Signed-off-by: Jolly Shah <[email protected]> --- drivers/soc/xilinx/Kconfig | 9 + drivers/soc/xilinx/Makefile | 2 + drivers/soc/xilinx/zynqmp_pm_domains.c | 352 +++++++++++++++++++++++++++++++++ 3 files changed, 363 insertions(+) create mode 100644 drivers/soc/xilinx/zynqmp_pm_domains.c diff --git a/drivers/soc/xilinx/Kconfig b/drivers/soc/xilinx/Kconfig index 687c8f3..964b205 100644 --- a/drivers/soc/xilinx/Kconfig +++ b/drivers/soc/xilinx/Kconfig @@ -17,4 +17,13 @@ config XILINX_VCU To compile this driver as a module, choose M here: the module will be called xlnx_vcu. +config ZYNQMP_PM_DOMAINS + bool "Enable Zynq MPSoC generic PM domains" + default y + depends on PM && ARCH_ZYNQMP + select PM_GENERIC_DOMAINS + help + Say yes to enable device power management through PM domains + If in doubt, say N. + endmenu diff --git a/drivers/soc/xilinx/Makefile b/drivers/soc/xilinx/Makefile index dee8fd5..f468d1b 100644 --- a/drivers/soc/xilinx/Makefile +++ b/drivers/soc/xilinx/Makefile @@ -1,2 +1,4 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_XILINX_VCU) += xlnx_vcu.o + +obj-$(CONFIG_ZYNQMP_PM_DOMAINS) += zynqmp_pm_domains.o diff --git a/drivers/soc/xilinx/zynqmp_pm_domains.c b/drivers/soc/xilinx/zynqmp_pm_domains.c new file mode 100644 index 0000000..aab462c --- /dev/null +++ b/drivers/soc/xilinx/zynqmp_pm_domains.c @@ -0,0 +1,352 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ZynqMP Generic PM domain support + * + * Copyright (C) 2015-2018 Xilinx, Inc. + * + * Davorin Mista <[email protected]> + * Jolly Shah <[email protected]> + * Rajan Vaja <[email protected]> + */ + +#include <linux/err.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/pm_domain.h> +#include <linux/slab.h> + +#include <linux/firmware/xlnx-zynqmp.h> + +/* Flag stating if PM nodes mapped to the PM domain has been requested */ +#define ZYNQMP_PM_DOMAIN_REQUESTED BIT(0) + +/** + * struct zynqmp_pm_domain - Wrapper around struct generic_pm_domain + * @gpd: Generic power domain + * @dev_list: List of devices belong to power domain + * @node_ids: PM node IDs corresponding to device(s) inside PM domain + * @node_id_num: Number of PM node IDs + * @flags: ZynqMP PM domain flags + */ +struct zynqmp_pm_domain { + struct generic_pm_domain gpd; + struct list_head dev_list; + u32 *node_ids; + int node_id_num; + u8 flags; +}; + +/* + * struct zynqmp_domain_device - Device node present in power domain + * @dev: Device + * &list: List member for the devices in domain list + */ +struct zynqmp_domain_device { + struct device *dev; + struct list_head list; +}; + +/** + * zynqmp_gpd_is_active_wakeup_path() - Check if device is in wakeup source + * path + * @dev: Device to check for wakeup source path + * @not_used: Data member (not required) + * + * This function is checks device's child hierarchy and checks if any device is + * set as wakeup source. + * + * Return: 1 if device is in wakeup source path else 0 + */ +static int zynqmp_gpd_is_active_wakeup_path(struct device *dev, void *not_used) +{ + int may_wakeup; + + may_wakeup = device_may_wakeup(dev); + if (may_wakeup) + return may_wakeup; + + return device_for_each_child(dev, NULL, + zynqmp_gpd_is_active_wakeup_path); +} + +/** + * zynqmp_gpd_power_on() - Power on PM domain + * @domain: Generic PM domain + * + * This function is called before devices inside a PM domain are resumed, to + * power on PM domain. + * + * Return: 0 on success, error code otherwise + */ +static int zynqmp_gpd_power_on(struct generic_pm_domain *domain) +{ + int i, ret; + struct zynqmp_pm_domain *pd; + const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops(); + + if (!eemi_ops || !eemi_ops->set_requirement) + return -ENXIO; + + pd = container_of(domain, struct zynqmp_pm_domain, gpd); + for (i = 0; i < pd->node_id_num; i++) { + ret = eemi_ops->set_requirement(pd->node_ids[i], + ZYNQMP_PM_CAPABILITY_ACCESS, + ZYNQMP_PM_MAX_QOS, + ZYNQMP_PM_REQUEST_ACK_BLOCKING); + if (ret) { + pr_err("%s() %s set requirement for node %d failed: %d\n", + __func__, domain->name, pd->node_ids[i], ret); + return ret; + } + } + + pr_debug("%s() Powered on %s domain\n", __func__, domain->name); + + return 0; +} + +/** + * zynqmp_gpd_power_off() - Power off PM domain + * @domain: Generic PM domain + * + * This function is called after devices inside a PM domain are suspended, to + * power off PM domain. + * + * Return: 0 on success, error code otherwise + */ +static int zynqmp_gpd_power_off(struct generic_pm_domain *domain) +{ + int i, ret; + struct zynqmp_pm_domain *pd; + struct zynqmp_domain_device *zdev, *tmp; + u32 capabilities = 0; + bool may_wakeup; + const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops(); + + if (!eemi_ops || !eemi_ops->set_requirement) + return -ENXIO; + + pd = container_of(domain, struct zynqmp_pm_domain, gpd); + + /* If domain is already released there is nothing to be done */ + if (!(pd->flags & ZYNQMP_PM_DOMAIN_REQUESTED)) + return 0; + + list_for_each_entry_safe(zdev, tmp, &pd->dev_list, list) { + /* If device is in wakeup path, set capability to WAKEUP */ + may_wakeup = zynqmp_gpd_is_active_wakeup_path(zdev->dev, NULL); + if (may_wakeup) { + dev_dbg(zdev->dev, "device is in wakeup path in %s\n", + domain->name); + capabilities = ZYNQMP_PM_CAPABILITY_WAKEUP; + break; + } + } + + for (i = pd->node_id_num - 1; i >= 0; i--) { + ret = eemi_ops->set_requirement(pd->node_ids[i], + capabilities, 0, + ZYNQMP_PM_REQUEST_ACK_NO); + /** + * If powering down of any node inside this domain fails, + * report and return the error + */ + if (ret) { + pr_err("%s() %s set requirement for node %d failed: %d\n", + __func__, domain->name, pd->node_ids[i], ret); + return ret; + } + } + + pr_debug("%s() Powered off %s domain\n", __func__, domain->name); + + return 0; +} + +/** + * zynqmp_gpd_attach_dev() - Attach device to the PM domain + * @domain: Generic PM domain + * @dev: Device to attach + * + * Return: 0 on success, error code otherwise + */ +static int zynqmp_gpd_attach_dev(struct generic_pm_domain *domain, + struct device *dev) +{ + int i, ret; + struct zynqmp_pm_domain *pd; + struct zynqmp_domain_device *zdev; + const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops(); + + if (!eemi_ops || !eemi_ops->request_node) + return -ENXIO; + + pd = container_of(domain, struct zynqmp_pm_domain, gpd); + + zdev = devm_kzalloc(dev, sizeof(*zdev), GFP_KERNEL); + if (!zdev) + return -ENOMEM; + + zdev->dev = dev; + list_add(&zdev->list, &pd->dev_list); + + /* If this is not the first device to attach there is nothing to do */ + if (domain->device_count) + return 0; + + for (i = 0; i < pd->node_id_num; i++) { + ret = eemi_ops->request_node(pd->node_ids[i], 0, 0, + ZYNQMP_PM_REQUEST_ACK_BLOCKING); + /* If requesting a node fails print and return the error */ + if (ret) { + pr_err("%s() %s request failed for node %d: %d\n", + __func__, domain->name, pd->node_ids[i], ret); + list_del(&zdev->list); + zdev->dev = NULL; + devm_kfree(dev, zdev); + return ret; + } + } + + pd->flags |= ZYNQMP_PM_DOMAIN_REQUESTED; + + pr_debug("%s() %s attached to %s domain\n", __func__, + dev_name(dev), domain->name); + + return 0; +} + +/** + * zynqmp_gpd_detach_dev() - Detach device from the PM domain + * @domain: Generic PM domain + * @dev: Device to detach + */ +static void zynqmp_gpd_detach_dev(struct generic_pm_domain *domain, + struct device *dev) +{ + int i, ret; + struct zynqmp_pm_domain *pd; + struct zynqmp_domain_device *zdev, *tmp; + const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops(); + + if (!eemi_ops || !eemi_ops->release_node) + return; + + pd = container_of(domain, struct zynqmp_pm_domain, gpd); + + list_for_each_entry_safe(zdev, tmp, &pd->dev_list, list) + if (zdev->dev == dev) { + list_del(&zdev->list); + zdev->dev = NULL; + devm_kfree(dev, zdev); + } + + /* If this is not the last device to detach there is nothing to do */ + if (domain->device_count) + return; + + for (i = 0; i < pd->node_id_num; i++) { + ret = eemi_ops->release_node(pd->node_ids[i]); + /* If releasing a node fails print the error and return */ + if (ret) { + pr_err("%s() %s release failed for node %d: %d\n", + __func__, domain->name, pd->node_ids[i], ret); + return; + } + } + + pd->flags &= ~ZYNQMP_PM_DOMAIN_REQUESTED; + + pr_debug("%s() %s detached from %s domain\n", __func__, + dev_name(dev), domain->name); +} + +/** + * zynqmp_gpd_probe() - Initialize ZynqMP specific PM domains + * @pdev: Platform device pointer + * + * Description: This function populates struct zynqmp_pm_domain for each PM + * domain and initalizes generic PM domain. If the "pd-id" DT property + * of a certain domain is missing or invalid, that domain will be skipped. + * + * Return: 0 on success, error code otherwise + */ +static int zynqmp_gpd_probe(struct platform_device *pdev) +{ + int ret; + struct device_node *child_err, *child, *np = pdev->dev.of_node; + + for_each_child_of_node(np, child) { + struct zynqmp_pm_domain *pd; + + pd = devm_kzalloc(&pdev->dev, sizeof(*pd), GFP_KERNEL); + if (!pd) { + ret = -ENOMEM; + goto err_cleanup; + } + + ret = of_property_count_u32_elems(child, "pd-id"); + if (ret <= 0) + goto err_cleanup; + + pd->node_id_num = ret; + pd->node_ids = devm_kcalloc(&pdev->dev, ret, + sizeof(*pd->node_ids), GFP_KERNEL); + if (!pd->node_ids) { + ret = -ENOMEM; + goto err_cleanup; + } + + ret = of_property_read_u32_array(child, "pd-id", pd->node_ids, + pd->node_id_num); + if (ret) + goto err_cleanup; + + pd->gpd.name = kstrdup(child->name, GFP_KERNEL); + pd->gpd.power_off = zynqmp_gpd_power_off; + pd->gpd.power_on = zynqmp_gpd_power_on; + pd->gpd.attach_dev = zynqmp_gpd_attach_dev; + pd->gpd.detach_dev = zynqmp_gpd_detach_dev; + + /* Mark all PM domains as initially powered off */ + pm_genpd_init(&pd->gpd, NULL, true); + + ret = of_genpd_add_provider_simple(child, &pd->gpd); + if (ret) + goto err_cleanup; + + INIT_LIST_HEAD(&pd->dev_list); + + pr_debug("%s() %s PM domain registered\n", + __func__, child->name); + } + + return 0; + +err_cleanup: + child_err = child; + for_each_child_of_node(np, child) { + if (child == child_err) + break; + of_genpd_del_provider(child); + } + + return ret; +} + +static const struct of_device_id zynqmp_power_domain_of_match[] = { + {.compatible = "xlnx,zynqmp-power-controller"}, + {}, +}; +MODULE_DEVICE_TABLE(of, zynqmp_power_domain_of_match); + +static struct platform_driver zynqmp_power_domain_driver = { + .driver = { + .name = "zynqmp_power_controller", + .of_match_table = zynqmp_power_domain_of_match, + }, + .probe = zynqmp_gpd_probe, +}; +module_platform_driver(zynqmp_power_domain_driver); -- 2.7.4
