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authorJolly Shah <jolly.shah@xilinx.com>2019-02-02 01:08:50 +0300
committerMichal Simek <michal.simek@xilinx.com>2019-02-12 15:38:16 +0300
commite23d9c6d0d4912fab12cd2d56070b0a8199772f0 (patch)
tree69d39c71f30424ee14d13a12cb87ce8edc6c484c /drivers/soc/xilinx
parentc1986ac3d483b051fc237aea3e9812fd1bb4d239 (diff)
downloadlinux-e23d9c6d0d4912fab12cd2d56070b0a8199772f0.tar.xz
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>
Diffstat (limited to 'drivers/soc/xilinx')
-rw-r--r--drivers/soc/xilinx/Kconfig9
-rw-r--r--drivers/soc/xilinx/Makefile1
-rw-r--r--drivers/soc/xilinx/zynqmp_pm_domains.c321
3 files changed, 331 insertions, 0 deletions
diff --git a/drivers/soc/xilinx/Kconfig b/drivers/soc/xilinx/Kconfig
index 5025e0e4fa36..01e76b58dd78 100644
--- a/drivers/soc/xilinx/Kconfig
+++ b/drivers/soc/xilinx/Kconfig
@@ -28,4 +28,13 @@ config ZYNQMP_POWER
power management callbacks from firmware.
If in doubt, say N.
+config ZYNQMP_PM_DOMAINS
+ bool "Enable Zynq MPSoC generic PM domains"
+ default y
+ depends on PM && ARCH_ZYNQMP && ZYNQMP_FIRMWARE
+ 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 428b9dbb1f2c..f66bfea5de17 100644
--- a/drivers/soc/xilinx/Makefile
+++ b/drivers/soc/xilinx/Makefile
@@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_XILINX_VCU) += xlnx_vcu.o
obj-$(CONFIG_ZYNQMP_POWER) += zynqmp_power.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 000000000000..354d256e6e00
--- /dev/null
+++ b/drivers/soc/xilinx/zynqmp_pm_domains.c
@@ -0,0 +1,321 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ZynqMP Generic PM domain support
+ *
+ * Copyright (C) 2015-2018 Xilinx, Inc.
+ *
+ * Davorin Mista <davorin.mista@aggios.com>
+ * Jolly Shah <jollys@xilinx.com>
+ * Rajan Vaja <rajan.vaja@xilinx.com>
+ */
+
+#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>
+
+#define ZYNQMP_NUM_DOMAINS (100)
+/* 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
+ * @node_id: PM node ID corresponding to device inside PM domain
+ * @flags: ZynqMP PM domain flags
+ */
+struct zynqmp_pm_domain {
+ struct generic_pm_domain gpd;
+ u32 node_id;
+ u8 flags;
+};
+
+/**
+ * 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 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);
+ ret = eemi_ops->set_requirement(pd->node_id,
+ 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_id, 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 ret;
+ struct pm_domain_data *pdd, *tmp;
+ struct zynqmp_pm_domain *pd;
+ 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)) {
+ pr_debug("%s() %s domain is already released\n",
+ __func__, domain->name);
+ return 0;
+ }
+
+ list_for_each_entry_safe(pdd, tmp, &domain->dev_list, list_node) {
+ /* If device is in wakeup path, set capability to WAKEUP */
+ may_wakeup = zynqmp_gpd_is_active_wakeup_path(pdd->dev, NULL);
+ if (may_wakeup) {
+ dev_dbg(pdd->dev, "device is in wakeup path in %s\n",
+ domain->name);
+ capabilities = ZYNQMP_PM_CAPABILITY_WAKEUP;
+ break;
+ }
+ }
+
+ ret = eemi_ops->set_requirement(pd->node_id, 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_id, 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 ret;
+ struct zynqmp_pm_domain *pd;
+ 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);
+
+ /* If this is not the first device to attach there is nothing to do */
+ if (domain->device_count)
+ return 0;
+
+ ret = eemi_ops->request_node(pd->node_id, 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_id, ret);
+ 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 ret;
+ struct zynqmp_pm_domain *pd;
+ 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);
+
+ /* If this is not the last device to detach there is nothing to do */
+ if (domain->device_count)
+ return;
+
+ ret = eemi_ops->release_node(pd->node_id);
+ /* 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_id, ret);
+ return;
+ }
+
+ pd->flags &= ~ZYNQMP_PM_DOMAIN_REQUESTED;
+
+ pr_debug("%s() %s detached from %s domain\n", __func__,
+ dev_name(dev), domain->name);
+}
+
+static struct generic_pm_domain *zynqmp_gpd_xlate
+ (struct of_phandle_args *genpdspec, void *data)
+{
+ struct genpd_onecell_data *genpd_data = data;
+ unsigned int i, idx = genpdspec->args[0];
+ struct zynqmp_pm_domain *pd;
+
+ pd = container_of(genpd_data->domains[0], struct zynqmp_pm_domain, gpd);
+
+ if (genpdspec->args_count != 1)
+ return ERR_PTR(-EINVAL);
+
+ /* Check for existing pm domains */
+ for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++) {
+ if (pd[i].node_id == idx)
+ goto done;
+ }
+
+ /**
+ * Add index in empty node_id of power domain list as no existing
+ * power domain found for current index.
+ */
+ for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++) {
+ if (pd[i].node_id == 0) {
+ pd[i].node_id = idx;
+ break;
+ }
+ }
+
+done:
+ if (!genpd_data->domains[i] || i == ZYNQMP_NUM_DOMAINS)
+ return ERR_PTR(-ENOENT);
+
+ return genpd_data->domains[i];
+}
+
+static int zynqmp_gpd_probe(struct platform_device *pdev)
+{
+ int i;
+ struct genpd_onecell_data *zynqmp_pd_data;
+ struct generic_pm_domain **domains;
+ struct zynqmp_pm_domain *pd;
+ struct device *dev = &pdev->dev;
+
+ pd = devm_kcalloc(dev, ZYNQMP_NUM_DOMAINS, sizeof(*pd), GFP_KERNEL);
+ if (!pd)
+ return -ENOMEM;
+
+ zynqmp_pd_data = devm_kzalloc(dev, sizeof(*zynqmp_pd_data), GFP_KERNEL);
+ if (!zynqmp_pd_data)
+ return -ENOMEM;
+
+ zynqmp_pd_data->xlate = zynqmp_gpd_xlate;
+
+ domains = devm_kcalloc(dev, ZYNQMP_NUM_DOMAINS, sizeof(*domains),
+ GFP_KERNEL);
+ if (!domains)
+ return -ENOMEM;
+
+ for (i = 0; i < ZYNQMP_NUM_DOMAINS; i++, pd++) {
+ pd->node_id = 0;
+ pd->gpd.name = kasprintf(GFP_KERNEL, "domain%d", i);
+ 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;
+
+ domains[i] = &pd->gpd;
+
+ /* Mark all PM domains as initially powered off */
+ pm_genpd_init(&pd->gpd, NULL, true);
+ }
+
+ zynqmp_pd_data->domains = domains;
+ zynqmp_pd_data->num_domains = ZYNQMP_NUM_DOMAINS;
+ of_genpd_add_provider_onecell(dev->parent->of_node, zynqmp_pd_data);
+
+ return 0;
+}
+
+static int zynqmp_gpd_remove(struct platform_device *pdev)
+{
+ of_genpd_del_provider(pdev->dev.parent->of_node);
+
+ return 0;
+}
+
+static struct platform_driver zynqmp_power_domain_driver = {
+ .driver = {
+ .name = "zynqmp_power_controller",
+ },
+ .probe = zynqmp_gpd_probe,
+ .remove = zynqmp_gpd_remove,
+};
+module_platform_driver(zynqmp_power_domain_driver);
+
+MODULE_ALIAS("platform:zynqmp_power_controller");