drivers/soc/xilinx/zynqmp_power.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Xilinx Zynq MPSoC Power Management
  *
  *  Copyright (C) 2014-2019 Xilinx, Inc.
  *
  *  Davorin Mista <davorin.mista@aggios.com>
  *  Jolly Shah <jollys@xilinx.com>
  *  Rajan Vaja <rajan.vaja@xilinx.com>
  */

 #include <linux/mailbox_client.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/reboot.h>
 #include <linux/suspend.h>

 #include <linux/firmware/xlnx-zynqmp.h>
 #include <linux/firmware/xlnx-event-manager.h>
 #include <linux/mailbox/zynqmp-ipi-message.h>

 /**
  * struct zynqmp_pm_work_struct - Wrapper for struct work_struct
  * @callback_work:	Work structure
  * @args:		Callback arguments
  */
 struct zynqmp_pm_work_struct {
 	struct work_struct callback_work;
 	u32 args[CB_ARG_CNT];
 };

 static struct zynqmp_pm_work_struct *zynqmp_pm_init_suspend_work;
 static struct mbox_chan *rx_chan;
 static bool event_registered;

 enum pm_suspend_mode {
 	PM_SUSPEND_MODE_FIRST = 0,
 	PM_SUSPEND_MODE_STD = PM_SUSPEND_MODE_FIRST,
 	PM_SUSPEND_MODE_POWER_OFF,
 };

 #define PM_SUSPEND_MODE_FIRST	PM_SUSPEND_MODE_STD

 static const char *const suspend_modes[] = {
 	[PM_SUSPEND_MODE_STD] = "standard",
 	[PM_SUSPEND_MODE_POWER_OFF] = "power-off",
 };

 static enum pm_suspend_mode suspend_mode = PM_SUSPEND_MODE_STD;

 static void zynqmp_pm_get_callback_data(u32 *buf)
 {
 	zynqmp_pm_invoke_fn(GET_CALLBACK_DATA, 0, 0, 0, 0, buf);
 }

 static void suspend_event_callback(const u32 *payload, void *data)
 {
 	/* First element is callback API ID, others are callback arguments */
 	if (work_pending(&zynqmp_pm_init_suspend_work->callback_work))
 		return;

 	/* Copy callback arguments into work's structure */
 	memcpy(zynqmp_pm_init_suspend_work->args, &payload[1],
 	       sizeof(zynqmp_pm_init_suspend_work->args));

 	queue_work(system_unbound_wq, &zynqmp_pm_init_suspend_work->callback_work);
 }

 static irqreturn_t zynqmp_pm_isr(int irq, void *data)
 {
 	u32 payload[CB_PAYLOAD_SIZE];

 	zynqmp_pm_get_callback_data(payload);

 	/* First element is callback API ID, others are callback arguments */
 	if (payload[0] == PM_INIT_SUSPEND_CB) {
 		switch (payload[1]) {
 		case SUSPEND_SYSTEM_SHUTDOWN:
 			orderly_poweroff(true);
 			break;
 		case SUSPEND_POWER_REQUEST:
 			pm_suspend(PM_SUSPEND_MEM);
 			break;
 		default:
 			pr_err("%s Unsupported InitSuspendCb reason "
 				"code %d\n", __func__, payload[1]);
 		}
 	}

 	return IRQ_HANDLED;
 }

 static void ipi_receive_callback(struct mbox_client *cl, void *data)
 {
 	struct zynqmp_ipi_message *msg = (struct zynqmp_ipi_message *)data;
 	u32 payload[CB_PAYLOAD_SIZE];
 	int ret;

 	memcpy(payload, msg->data, sizeof(msg->len));
 	/* First element is callback API ID, others are callback arguments */
 	if (payload[0] == PM_INIT_SUSPEND_CB) {
 		if (work_pending(&zynqmp_pm_init_suspend_work->callback_work))
 			return;

 		/* Copy callback arguments into work's structure */
 		memcpy(zynqmp_pm_init_suspend_work->args, &payload[1],
 		       sizeof(zynqmp_pm_init_suspend_work->args));

 		queue_work(system_unbound_wq,
 			   &zynqmp_pm_init_suspend_work->callback_work);

 		/* Send NULL message to mbox controller to ack the message */
 		ret = mbox_send_message(rx_chan, NULL);
 		if (ret)
 			pr_err("IPI ack failed. Error %d\n", ret);
 	}
 }

 /**
  * zynqmp_pm_init_suspend_work_fn - Initialize suspend
  * @work:	Pointer to work_struct
  *
  * Bottom-half of PM callback IRQ handler.
  */
 static void zynqmp_pm_init_suspend_work_fn(struct work_struct *work)
 {
 	struct zynqmp_pm_work_struct *pm_work =
 		container_of(work, struct zynqmp_pm_work_struct, callback_work);

 	if (pm_work->args[0] == SUSPEND_SYSTEM_SHUTDOWN) {
 		orderly_poweroff(true);
 	} else if (pm_work->args[0] == SUSPEND_POWER_REQUEST) {
 		pm_suspend(PM_SUSPEND_MEM);
 	} else {
 		pr_err("%s Unsupported InitSuspendCb reason code %d.\n",
 		       __func__, pm_work->args[0]);
 	}
 }

 static ssize_t suspend_mode_show(struct device *dev,
 				 struct device_attribute *attr, char *buf)
 {
 	char *s = buf;
 	int md;

 	for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++)
 		if (suspend_modes[md]) {
 			if (md == suspend_mode)
 				s += sprintf(s, "[%s] ", suspend_modes[md]);
 			else
 				s += sprintf(s, "%s ", suspend_modes[md]);
 		}

 	/* Convert last space to newline */
 	if (s != buf)
 		*(s - 1) = '\n';
 	return (s - buf);
 }

 static ssize_t suspend_mode_store(struct device *dev,
 				  struct device_attribute *attr,
 				  const char *buf, size_t count)
 {
 	int md, ret = -EINVAL;

 	for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++)
 		if (suspend_modes[md] &&
 		    sysfs_streq(suspend_modes[md], buf)) {
 			ret = 0;
 			break;
 		}

 	if (!ret && md != suspend_mode) {
 		ret = zynqmp_pm_set_suspend_mode(md);
 		if (likely(!ret))
 			suspend_mode = md;
 	}

 	return ret ? ret : count;
 }

 static DEVICE_ATTR_RW(suspend_mode);

 static int zynqmp_pm_probe(struct platform_device *pdev)
 {
 	int ret, irq;
 	u32 pm_api_version;
 	struct mbox_client *client;

 	zynqmp_pm_get_api_version(&pm_api_version);

 	/* Check PM API version number */
 	if (pm_api_version < ZYNQMP_PM_VERSION)
 		return -ENODEV;

 	/*
 	 * First try to use Xilinx Event Manager by registering suspend_event_callback
 	 * for suspend/shutdown event.
 	 * If xlnx_register_event() returns -EACCES (Xilinx Event Manager
 	 * is not available to use) or -ENODEV(Xilinx Event Manager not compiled),
 	 * then use ipi-mailbox or interrupt method.
 	 */
 	ret = xlnx_register_event(PM_INIT_SUSPEND_CB, 0, 0, false,
 				  suspend_event_callback, NULL);
 	if (!ret) {
 		zynqmp_pm_init_suspend_work = devm_kzalloc(&pdev->dev,
 							   sizeof(struct zynqmp_pm_work_struct),
 							   GFP_KERNEL);
 		if (!zynqmp_pm_init_suspend_work) {
 			xlnx_unregister_event(PM_INIT_SUSPEND_CB, 0, 0,
 					      suspend_event_callback, NULL);
 			return -ENOMEM;
 		}
 		event_registered = true;

 		INIT_WORK(&zynqmp_pm_init_suspend_work->callback_work,
 			  zynqmp_pm_init_suspend_work_fn);
 	} else if (ret != -EACCES && ret != -ENODEV) {
 		dev_err(&pdev->dev, "Failed to Register with Xilinx Event manager %d\n", ret);
 		return ret;
 	} else if (of_property_present(pdev->dev.of_node, "mboxes")) {
 		zynqmp_pm_init_suspend_work =
 			devm_kzalloc(&pdev->dev,
 				     sizeof(struct zynqmp_pm_work_struct),
 				     GFP_KERNEL);
 		if (!zynqmp_pm_init_suspend_work)
 			return -ENOMEM;

 		INIT_WORK(&zynqmp_pm_init_suspend_work->callback_work,
 			  zynqmp_pm_init_suspend_work_fn);
 		client = devm_kzalloc(&pdev->dev, sizeof(*client), GFP_KERNEL);
 		if (!client)
 			return -ENOMEM;

 		client->dev = &pdev->dev;
 		client->rx_callback = ipi_receive_callback;

 		rx_chan = mbox_request_channel_byname(client, "rx");
 		if (IS_ERR(rx_chan)) {
 			dev_err(&pdev->dev, "Failed to request rx channel\n");
 			return PTR_ERR(rx_chan);
 		}
 	} else if (of_property_present(pdev->dev.of_node, "interrupts")) {
 		irq = platform_get_irq(pdev, 0);
 		if (irq < 0)
 			return irq;

 		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
 						zynqmp_pm_isr,
 						IRQF_NO_SUSPEND | IRQF_ONESHOT,
 						dev_name(&pdev->dev),
 						&pdev->dev);
 		if (ret) {
 			dev_err(&pdev->dev, "devm_request_threaded_irq '%d' "
 					    "failed with %d\n", irq, ret);
 			return ret;
 		}
 	} else {
 		dev_err(&pdev->dev, "Required property not found in DT node\n");
 		return -ENOENT;
 	}

 	ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
 	if (ret) {
 		if (event_registered) {
 			xlnx_unregister_event(PM_INIT_SUSPEND_CB, 0, 0, suspend_event_callback,
 					      NULL);
 			event_registered = false;
 		}
 		dev_err(&pdev->dev, "unable to create sysfs interface\n");
 		return ret;
 	}

 	return 0;
 }

 static int zynqmp_pm_remove(struct platform_device *pdev)
 {
 	sysfs_remove_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
 	if (event_registered)
 		xlnx_unregister_event(PM_INIT_SUSPEND_CB, 0, 0, suspend_event_callback, NULL);

 	if (!rx_chan)
 		mbox_free_channel(rx_chan);

 	return 0;
 }

 static const struct of_device_id pm_of_match[] = {
 	{ .compatible = "xlnx,zynqmp-power", },
 	{ /* end of table */ },
 };
 MODULE_DEVICE_TABLE(of, pm_of_match);

 static struct platform_driver zynqmp_pm_platform_driver = {
 	.probe = zynqmp_pm_probe,
 	.remove = zynqmp_pm_remove,
 	.driver = {
 		.name = "zynqmp_power",
 		.of_match_table = pm_of_match,
 	},
 };
 module_platform_driver(zynqmp_pm_platform_driver);
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Xilinx Zynq MPSoC Power Management
	*
	* Copyright (C) 2014-2019 Xilinx, Inc.
	*
	* Davorin Mista <davorin.mista@aggios.com>
	* Jolly Shah <jollys@xilinx.com>
	* Rajan Vaja <rajan.vaja@xilinx.com>
	*/

	#include <linux/mailbox_client.h>
	#include <linux/module.h>
	#include <linux/of.h>
	#include <linux/platform_device.h>
	#include <linux/reboot.h>
	#include <linux/suspend.h>

	#include <linux/firmware/xlnx-zynqmp.h>
	#include <linux/firmware/xlnx-event-manager.h>
	#include <linux/mailbox/zynqmp-ipi-message.h>

	/**
	* struct zynqmp_pm_work_struct - Wrapper for struct work_struct
	* @callback_work: Work structure
	* @args: Callback arguments
	*/
	struct zynqmp_pm_work_struct {
	struct work_struct callback_work;
	u32 args[CB_ARG_CNT];
	};

	static struct zynqmp_pm_work_struct *zynqmp_pm_init_suspend_work;
	static struct mbox_chan *rx_chan;
	static bool event_registered;

	enum pm_suspend_mode {
	PM_SUSPEND_MODE_FIRST = 0,
	PM_SUSPEND_MODE_STD = PM_SUSPEND_MODE_FIRST,
	PM_SUSPEND_MODE_POWER_OFF,
	};

	#define PM_SUSPEND_MODE_FIRST PM_SUSPEND_MODE_STD

	static const char *const suspend_modes[] = {
	[PM_SUSPEND_MODE_STD] = "standard",
	[PM_SUSPEND_MODE_POWER_OFF] = "power-off",
	};

	static enum pm_suspend_mode suspend_mode = PM_SUSPEND_MODE_STD;

	static void zynqmp_pm_get_callback_data(u32 *buf)
	{
	zynqmp_pm_invoke_fn(GET_CALLBACK_DATA, 0, 0, 0, 0, buf);
	}

	static void suspend_event_callback(const u32 payload, void data)
	{
	/* First element is callback API ID, others are callback arguments */
	if (work_pending(&zynqmp_pm_init_suspend_work->callback_work))
	return;

	/* Copy callback arguments into work's structure */
	memcpy(zynqmp_pm_init_suspend_work->args, &payload[1],
	sizeof(zynqmp_pm_init_suspend_work->args));

	queue_work(system_unbound_wq, &zynqmp_pm_init_suspend_work->callback_work);
	}

	static irqreturn_t zynqmp_pm_isr(int irq, void *data)
	{
	u32 payload[CB_PAYLOAD_SIZE];

	zynqmp_pm_get_callback_data(payload);

	/* First element is callback API ID, others are callback arguments */
	if (payload[0] == PM_INIT_SUSPEND_CB) {
	switch (payload[1]) {
	case SUSPEND_SYSTEM_SHUTDOWN:
	orderly_poweroff(true);
	break;
	case SUSPEND_POWER_REQUEST:
	pm_suspend(PM_SUSPEND_MEM);
	break;
	default:
	pr_err("%s Unsupported InitSuspendCb reason "
	"code %d\n", __func__, payload[1]);
	}
	}

	return IRQ_HANDLED;
	}

	static void ipi_receive_callback(struct mbox_client cl, void data)
	{
	struct zynqmp_ipi_message msg = (struct zynqmp_ipi_message )data;
	u32 payload[CB_PAYLOAD_SIZE];
	int ret;

	memcpy(payload, msg->data, sizeof(msg->len));
	/* First element is callback API ID, others are callback arguments */
	if (payload[0] == PM_INIT_SUSPEND_CB) {
	if (work_pending(&zynqmp_pm_init_suspend_work->callback_work))
	return;

	/* Copy callback arguments into work's structure */
	memcpy(zynqmp_pm_init_suspend_work->args, &payload[1],
	sizeof(zynqmp_pm_init_suspend_work->args));

	queue_work(system_unbound_wq,
	&zynqmp_pm_init_suspend_work->callback_work);

	/* Send NULL message to mbox controller to ack the message */
	ret = mbox_send_message(rx_chan, NULL);
	if (ret)
	pr_err("IPI ack failed. Error %d\n", ret);
	}
	}

	/**
	* zynqmp_pm_init_suspend_work_fn - Initialize suspend
	* @work: Pointer to work_struct
	*
	* Bottom-half of PM callback IRQ handler.
	*/
	static void zynqmp_pm_init_suspend_work_fn(struct work_struct *work)
	{
	struct zynqmp_pm_work_struct *pm_work =
	container_of(work, struct zynqmp_pm_work_struct, callback_work);

	if (pm_work->args[0] == SUSPEND_SYSTEM_SHUTDOWN) {
	orderly_poweroff(true);
	} else if (pm_work->args[0] == SUSPEND_POWER_REQUEST) {
	pm_suspend(PM_SUSPEND_MEM);
	} else {
	pr_err("%s Unsupported InitSuspendCb reason code %d.\n",
	__func__, pm_work->args[0]);
	}
	}

	static ssize_t suspend_mode_show(struct device *dev,
	struct device_attribute attr, char buf)
	{
	char *s = buf;
	int md;

	for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++)
	if (suspend_modes[md]) {
	if (md == suspend_mode)
	s += sprintf(s, "[%s] ", suspend_modes[md]);
	else
	s += sprintf(s, "%s ", suspend_modes[md]);
	}

	/* Convert last space to newline */
	if (s != buf)
	*(s - 1) = '\n';
	return (s - buf);
	}

	static ssize_t suspend_mode_store(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count)
	{
	int md, ret = -EINVAL;

	for (md = PM_SUSPEND_MODE_FIRST; md < ARRAY_SIZE(suspend_modes); md++)
	if (suspend_modes[md] &&
	sysfs_streq(suspend_modes[md], buf)) {
	ret = 0;
	break;
	}

	if (!ret && md != suspend_mode) {
	ret = zynqmp_pm_set_suspend_mode(md);
	if (likely(!ret))
	suspend_mode = md;
	}

	return ret ? ret : count;
	}

	static DEVICE_ATTR_RW(suspend_mode);

	static int zynqmp_pm_probe(struct platform_device *pdev)
	{
	int ret, irq;
	u32 pm_api_version;
	struct mbox_client *client;

	zynqmp_pm_get_api_version(&pm_api_version);

	/* Check PM API version number */
	if (pm_api_version < ZYNQMP_PM_VERSION)
	return -ENODEV;

	/*
	* First try to use Xilinx Event Manager by registering suspend_event_callback
	* for suspend/shutdown event.
	* If xlnx_register_event() returns -EACCES (Xilinx Event Manager
	* is not available to use) or -ENODEV(Xilinx Event Manager not compiled),
	* then use ipi-mailbox or interrupt method.
	*/
	ret = xlnx_register_event(PM_INIT_SUSPEND_CB, 0, 0, false,
	suspend_event_callback, NULL);
	if (!ret) {
	zynqmp_pm_init_suspend_work = devm_kzalloc(&pdev->dev,
	sizeof(struct zynqmp_pm_work_struct),
	GFP_KERNEL);
	if (!zynqmp_pm_init_suspend_work) {
	xlnx_unregister_event(PM_INIT_SUSPEND_CB, 0, 0,
	suspend_event_callback, NULL);
	return -ENOMEM;
	}
	event_registered = true;

	INIT_WORK(&zynqmp_pm_init_suspend_work->callback_work,
	zynqmp_pm_init_suspend_work_fn);
	} else if (ret != -EACCES && ret != -ENODEV) {
	dev_err(&pdev->dev, "Failed to Register with Xilinx Event manager %d\n", ret);
	return ret;
	} else if (of_property_present(pdev->dev.of_node, "mboxes")) {
	zynqmp_pm_init_suspend_work =
	devm_kzalloc(&pdev->dev,
	sizeof(struct zynqmp_pm_work_struct),
	GFP_KERNEL);
	if (!zynqmp_pm_init_suspend_work)
	return -ENOMEM;

	INIT_WORK(&zynqmp_pm_init_suspend_work->callback_work,
	zynqmp_pm_init_suspend_work_fn);
	client = devm_kzalloc(&pdev->dev, sizeof(*client), GFP_KERNEL);
	if (!client)
	return -ENOMEM;

	client->dev = &pdev->dev;
	client->rx_callback = ipi_receive_callback;

	rx_chan = mbox_request_channel_byname(client, "rx");
	if (IS_ERR(rx_chan)) {
	dev_err(&pdev->dev, "Failed to request rx channel\n");
	return PTR_ERR(rx_chan);
	}
	} else if (of_property_present(pdev->dev.of_node, "interrupts")) {
	irq = platform_get_irq(pdev, 0);
	if (irq < 0)
	return irq;

	ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
	zynqmp_pm_isr,
	IRQF_NO_SUSPEND \| IRQF_ONESHOT,
	dev_name(&pdev->dev),
	&pdev->dev);
	if (ret) {
	dev_err(&pdev->dev, "devm_request_threaded_irq '%d' "
	"failed with %d\n", irq, ret);
	return ret;
	}
	} else {
	dev_err(&pdev->dev, "Required property not found in DT node\n");
	return -ENOENT;
	}

	ret = sysfs_create_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
	if (ret) {
	if (event_registered) {
	xlnx_unregister_event(PM_INIT_SUSPEND_CB, 0, 0, suspend_event_callback,
	NULL);
	event_registered = false;
	}
	dev_err(&pdev->dev, "unable to create sysfs interface\n");
	return ret;
	}

	return 0;
	}

	static int zynqmp_pm_remove(struct platform_device *pdev)
	{
	sysfs_remove_file(&pdev->dev.kobj, &dev_attr_suspend_mode.attr);
	if (event_registered)
	xlnx_unregister_event(PM_INIT_SUSPEND_CB, 0, 0, suspend_event_callback, NULL);

	if (!rx_chan)
	mbox_free_channel(rx_chan);

	return 0;
	}

	static const struct of_device_id pm_of_match[] = {
	{ .compatible = "xlnx,zynqmp-power", },
	{ /* end of table */ },
	};
	MODULE_DEVICE_TABLE(of, pm_of_match);

	static struct platform_driver zynqmp_pm_platform_driver = {
	.probe = zynqmp_pm_probe,
	.remove = zynqmp_pm_remove,
	.driver = {
	.name = "zynqmp_power",
	.of_match_table = pm_of_match,
	},
	};
	module_platform_driver(zynqmp_pm_platform_driver);