drivers: soc: xilinx: Add ZynqMP power domain driver
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 <rajan.vaja@xilinx.com> Signed-off-by: Jolly Shah <jolly.shah@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
This commit is contained in:
Jolly Shah
Michal Simek
parent
c1986ac3d4
commit
e23d9c6d0d
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@ -6,6 +6,7 @@ menu "Zynq MPSoC Firmware Drivers"
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config ZYNQMP_FIRMWARE
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bool "Enable Xilinx Zynq MPSoC firmware interface"
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select MFD_CORE
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help
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Firmware interface driver is used by different
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drivers to communicate with the firmware for
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@ -14,6 +14,7 @@
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#include <linux/compiler.h>
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#include <linux/device.h>
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#include <linux/init.h>
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#include <linux/mfd/core.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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@ -23,6 +24,12 @@
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#include <linux/firmware/xlnx-zynqmp.h>
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#include "zynqmp-debug.h"
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static const struct mfd_cell firmware_devs[] = {
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{
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.name = "zynqmp_power_controller",
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},
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};
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/**
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* zynqmp_pm_ret_code() - Convert PMU-FW error codes to Linux error codes
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* @ret_status: PMUFW return code
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@ -689,11 +696,19 @@ static int zynqmp_firmware_probe(struct platform_device *pdev)
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zynqmp_pm_api_debugfs_init();
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ret = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, firmware_devs,
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ARRAY_SIZE(firmware_devs), NULL, 0, NULL);
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if (ret) {
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dev_err(&pdev->dev, "failed to add MFD devices %d\n", ret);
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return ret;
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}
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return of_platform_populate(dev->of_node, NULL, NULL, dev);
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}
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static int zynqmp_firmware_remove(struct platform_device *pdev)
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{
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mfd_remove_devices(&pdev->dev);
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zynqmp_pm_api_debugfs_exit();
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return 0;
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@ -28,4 +28,13 @@ config ZYNQMP_POWER
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power management callbacks from firmware.
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If in doubt, say N.
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config ZYNQMP_PM_DOMAINS
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bool "Enable Zynq MPSoC generic PM domains"
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default y
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depends on PM && ARCH_ZYNQMP && ZYNQMP_FIRMWARE
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select PM_GENERIC_DOMAINS
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help
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Say yes to enable device power management through PM domains
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If in doubt, say N.
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endmenu
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@ -1,3 +1,4 @@
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# SPDX-License-Identifier: GPL-2.0
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obj-$(CONFIG_XILINX_VCU) += xlnx_vcu.o
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obj-$(CONFIG_ZYNQMP_POWER) += zynqmp_power.o
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obj-$(CONFIG_ZYNQMP_PM_DOMAINS) += zynqmp_pm_domains.o
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@ -0,0 +1,321 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* ZynqMP Generic PM domain support
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*
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* Copyright (C) 2015-2018 Xilinx, Inc.
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*
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* Davorin Mista <davorin.mista@aggios.com>
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* Jolly Shah <jollys@xilinx.com>
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* Rajan Vaja <rajan.vaja@xilinx.com>
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*/
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#include <linux/err.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/pm_domain.h>
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#include <linux/slab.h>
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#include <linux/firmware/xlnx-zynqmp.h>
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#define ZYNQMP_NUM_DOMAINS (100)
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/* Flag stating if PM nodes mapped to the PM domain has been requested */
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#define ZYNQMP_PM_DOMAIN_REQUESTED BIT(0)
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/**
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* struct zynqmp_pm_domain - Wrapper around struct generic_pm_domain
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* @gpd: Generic power domain
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* @node_id: PM node ID corresponding to device inside PM domain
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* @flags: ZynqMP PM domain flags
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*/
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struct zynqmp_pm_domain {
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struct generic_pm_domain gpd;
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u32 node_id;
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u8 flags;
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};
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/**
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* zynqmp_gpd_is_active_wakeup_path() - Check if device is in wakeup source
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* path
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* @dev: Device to check for wakeup source path
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* @not_used: Data member (not required)
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*
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* This function is checks device's child hierarchy and checks if any device is
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* set as wakeup source.
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*
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* Return: 1 if device is in wakeup source path else 0
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*/
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static int zynqmp_gpd_is_active_wakeup_path(struct device *dev, void *not_used)
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{
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int may_wakeup;
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may_wakeup = device_may_wakeup(dev);
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if (may_wakeup)
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return may_wakeup;
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return device_for_each_child(dev, NULL,
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zynqmp_gpd_is_active_wakeup_path);
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}
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/**
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* zynqmp_gpd_power_on() - Power on PM domain
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* @domain: Generic PM domain
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*
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* This function is called before devices inside a PM domain are resumed, to
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* power on PM domain.
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*
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* Return: 0 on success, error code otherwise
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*/
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static int zynqmp_gpd_power_on(struct generic_pm_domain *domain)
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{
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int ret;
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struct zynqmp_pm_domain *pd;
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const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
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if (!eemi_ops || !eemi_ops->set_requirement)
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return -ENXIO;
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pd = container_of(domain, struct zynqmp_pm_domain, gpd);
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ret = eemi_ops->set_requirement(pd->node_id,
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ZYNQMP_PM_CAPABILITY_ACCESS,
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ZYNQMP_PM_MAX_QOS,
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ZYNQMP_PM_REQUEST_ACK_BLOCKING);
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if (ret) {
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pr_err("%s() %s set requirement for node %d failed: %d\n",
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__func__, domain->name, pd->node_id, ret);
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return ret;
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}
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pr_debug("%s() Powered on %s domain\n", __func__, domain->name);
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return 0;
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}
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/**
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* zynqmp_gpd_power_off() - Power off PM domain
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* @domain: Generic PM domain
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*
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* This function is called after devices inside a PM domain are suspended, to
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* power off PM domain.
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*
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* Return: 0 on success, error code otherwise
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*/
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static int zynqmp_gpd_power_off(struct generic_pm_domain *domain)
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{
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int ret;
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struct pm_domain_data *pdd, *tmp;
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struct zynqmp_pm_domain *pd;
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u32 capabilities = 0;
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bool may_wakeup;
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const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
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if (!eemi_ops || !eemi_ops->set_requirement)
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return -ENXIO;
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pd = container_of(domain, struct zynqmp_pm_domain, gpd);
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/* If domain is already released there is nothing to be done */
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if (!(pd->flags & ZYNQMP_PM_DOMAIN_REQUESTED)) {
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pr_debug("%s() %s domain is already released\n",
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__func__, domain->name);
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return 0;
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}
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list_for_each_entry_safe(pdd, tmp, &domain->dev_list, list_node) {
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/* If device is in wakeup path, set capability to WAKEUP */
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may_wakeup = zynqmp_gpd_is_active_wakeup_path(pdd->dev, NULL);
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if (may_wakeup) {
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dev_dbg(pdd->dev, "device is in wakeup path in %s\n",
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domain->name);
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capabilities = ZYNQMP_PM_CAPABILITY_WAKEUP;
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break;
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}
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}
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ret = eemi_ops->set_requirement(pd->node_id, capabilities, 0,
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ZYNQMP_PM_REQUEST_ACK_NO);
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/**
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* If powering down of any node inside this domain fails,
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* report and return the error
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*/
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if (ret) {
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pr_err("%s() %s set requirement for node %d failed: %d\n",
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__func__, domain->name, pd->node_id, ret);
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return ret;
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}
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pr_debug("%s() Powered off %s domain\n", __func__, domain->name);
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return 0;
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}
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/**
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* zynqmp_gpd_attach_dev() - Attach device to the PM domain
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* @domain: Generic PM domain
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* @dev: Device to attach
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*
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* Return: 0 on success, error code otherwise
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*/
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static int zynqmp_gpd_attach_dev(struct generic_pm_domain *domain,
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struct device *dev)
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{
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int ret;
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struct zynqmp_pm_domain *pd;
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const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
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if (!eemi_ops || !eemi_ops->request_node)
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return -ENXIO;
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pd = container_of(domain, struct zynqmp_pm_domain, gpd);
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/* If this is not the first device to attach there is nothing to do */
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if (domain->device_count)
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return 0;
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ret = eemi_ops->request_node(pd->node_id, 0, 0,
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ZYNQMP_PM_REQUEST_ACK_BLOCKING);
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/* If requesting a node fails print and return the error */
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if (ret) {
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pr_err("%s() %s request failed for node %d: %d\n",
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__func__, domain->name, pd->node_id, ret);
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return ret;
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}
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pd->flags |= ZYNQMP_PM_DOMAIN_REQUESTED;
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pr_debug("%s() %s attached to %s domain\n", __func__,
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dev_name(dev), domain->name);
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return 0;
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}
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/**
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* zynqmp_gpd_detach_dev() - Detach device from the PM domain
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* @domain: Generic PM domain
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* @dev: Device to detach
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*/
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static void zynqmp_gpd_detach_dev(struct generic_pm_domain *domain,
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struct device *dev)
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{
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int ret;
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struct zynqmp_pm_domain *pd;
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const struct zynqmp_eemi_ops *eemi_ops = zynqmp_pm_get_eemi_ops();
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if (!eemi_ops || !eemi_ops->release_node)
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return;
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pd = container_of(domain, struct zynqmp_pm_domain, gpd);
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/* If this is not the last device to detach there is nothing to do */
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if (domain->device_count)
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return;
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ret = eemi_ops->release_node(pd->node_id);
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/* If releasing a node fails print the error and return */
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if (ret) {
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pr_err("%s() %s release failed for node %d: %d\n",
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__func__, domain->name, pd->node_id, ret);
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return;
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}
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pd->flags &= ~ZYNQMP_PM_DOMAIN_REQUESTED;
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pr_debug("%s() %s detached from %s domain\n", __func__,
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dev_name(dev), domain->name);
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}
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static struct generic_pm_domain *zynqmp_gpd_xlate
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(struct of_phandle_args *genpdspec, void *data)
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{
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struct genpd_onecell_data *genpd_data = data;
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unsigned int i, idx = genpdspec->args[0];
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struct zynqmp_pm_domain *pd;
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pd = container_of(genpd_data->domains[0], struct zynqmp_pm_domain, gpd);
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if (genpdspec->args_count != 1)
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return ERR_PTR(-EINVAL);
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/* Check for existing pm domains */
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for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++) {
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if (pd[i].node_id == idx)
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goto done;
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}
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/**
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* Add index in empty node_id of power domain list as no existing
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* power domain found for current index.
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*/
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for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++) {
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if (pd[i].node_id == 0) {
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pd[i].node_id = idx;
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break;
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}
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}
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done:
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if (!genpd_data->domains[i] || i == ZYNQMP_NUM_DOMAINS)
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return ERR_PTR(-ENOENT);
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return genpd_data->domains[i];
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}
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static int zynqmp_gpd_probe(struct platform_device *pdev)
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{
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int i;
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struct genpd_onecell_data *zynqmp_pd_data;
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struct generic_pm_domain **domains;
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struct zynqmp_pm_domain *pd;
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struct device *dev = &pdev->dev;
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pd = devm_kcalloc(dev, ZYNQMP_NUM_DOMAINS, sizeof(*pd), GFP_KERNEL);
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if (!pd)
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return -ENOMEM;
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zynqmp_pd_data = devm_kzalloc(dev, sizeof(*zynqmp_pd_data), GFP_KERNEL);
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if (!zynqmp_pd_data)
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return -ENOMEM;
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zynqmp_pd_data->xlate = zynqmp_gpd_xlate;
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domains = devm_kcalloc(dev, ZYNQMP_NUM_DOMAINS, sizeof(*domains),
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GFP_KERNEL);
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if (!domains)
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return -ENOMEM;
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for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++, pd++) {
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pd->node_id = 0;
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pd->gpd.name = kasprintf(GFP_KERNEL, "domain%d", i);
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pd->gpd.power_off = zynqmp_gpd_power_off;
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pd->gpd.power_on = zynqmp_gpd_power_on;
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pd->gpd.attach_dev = zynqmp_gpd_attach_dev;
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pd->gpd.detach_dev = zynqmp_gpd_detach_dev;
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domains[i] = &pd->gpd;
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/* Mark all PM domains as initially powered off */
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pm_genpd_init(&pd->gpd, NULL, true);
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}
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zynqmp_pd_data->domains = domains;
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zynqmp_pd_data->num_domains = ZYNQMP_NUM_DOMAINS;
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of_genpd_add_provider_onecell(dev->parent->of_node, zynqmp_pd_data);
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return 0;
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}
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static int zynqmp_gpd_remove(struct platform_device *pdev)
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{
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of_genpd_del_provider(pdev->dev.parent->of_node);
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return 0;
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}
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static struct platform_driver zynqmp_power_domain_driver = {
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.driver = {
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.name = "zynqmp_power_controller",
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},
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.probe = zynqmp_gpd_probe,
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.remove = zynqmp_gpd_remove,
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};
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module_platform_driver(zynqmp_power_domain_driver);
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MODULE_ALIAS("platform:zynqmp_power_controller");
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