drivers/firmware/firmware-zynqmp.c - filogic/uboot - Gitiles

 // SPDX-License-Identifier: GPL-2.0
 /*
  * Xilinx Zynq MPSoC Firmware driver
  *
  * Copyright (C) 2018-2019 Xilinx, Inc.
  */

 #include <cpu_func.h>
 #include <dm.h>
 #include <dm/device_compat.h>
 #include <dm/lists.h>
 #include <log.h>
 #include <zynqmp_firmware.h>
 #include <asm/cache.h>
 #include <asm/ptrace.h>

 #if defined(CONFIG_ZYNQMP_IPI)
 #include <mailbox.h>
 #include <asm/arch/sys_proto.h>

 #define PMUFW_PAYLOAD_ARG_CNT	8

 #define XST_PM_NO_ACCESS	2002L
 #define XST_PM_ALREADY_CONFIGURED	2009L

 static struct zynqmp_power {
 	struct mbox_chan tx_chan;
 	struct mbox_chan rx_chan;
 } zynqmp_power __section(".data");

 #define NODE_ID_LOCATION	5

 static unsigned int xpm_configobject[] = {
 	/**********************************************************************/
 	/* HEADER */
 	2,	/* Number of remaining words in the header */
 	1,	/* Number of sections included in config object */
 	PM_CONFIG_OBJECT_TYPE_OVERLAY,	/* Type of Config object as overlay */
 	/**********************************************************************/
 	/* SLAVE SECTION */

 	PM_CONFIG_SLAVE_SECTION_ID,	/* Section ID */
 	1,				/* Number of slaves */

 	0, /* Node ID which will be changed below */
 	PM_SLAVE_FLAG_IS_SHAREABLE,
 	PM_CONFIG_IPI_PSU_CORTEXA53_0_MASK |
 	PM_CONFIG_IPI_PSU_CORTEXR5_0_MASK |
 	PM_CONFIG_IPI_PSU_CORTEXR5_1_MASK, /* IPI Mask */
 };

 static unsigned int xpm_configobject_close[] = {
 	/**********************************************************************/
 	/* HEADER */
 	2,	/* Number of remaining words in the header */
 	1,	/* Number of sections included in config object */
 	PM_CONFIG_OBJECT_TYPE_OVERLAY,	/* Type of Config object as overlay */
 	/**********************************************************************/
 	/* SET CONFIG SECTION */
 	PM_CONFIG_SET_CONFIG_SECTION_ID,
 	0U,	/* Loading permission to Overlay config object */
 };

 int zynqmp_pmufw_config_close(void)
 {
 	return zynqmp_pmufw_load_config_object(xpm_configobject_close,
 					       sizeof(xpm_configobject_close));
 }

 int zynqmp_pmufw_node(u32 id)
 {
 	static bool check = true;
 	static bool permission = true;

 	if (check) {
 		check = false;

 		if (zynqmp_pmufw_node(NODE_OCM_BANK_0) == -EACCES) {
 			printf("PMUFW:  No permission to change config object\n");
 			permission = false;
 		}
 	}

 	if (!permission)
 		return 0;

 	/* Record power domain id */
 	xpm_configobject[NODE_ID_LOCATION] = id;

 	return zynqmp_pmufw_load_config_object(xpm_configobject,
 					       sizeof(xpm_configobject));
 }

 static int do_pm_probe(void)
 {
 	struct udevice *dev;
 	int ret;

 	ret = uclass_get_device_by_driver(UCLASS_FIRMWARE,
 					  DM_DRIVER_GET(zynqmp_power),
 					  &dev);
 	if (ret)
 		debug("%s: Probing device failed: %d\n", __func__, ret);

 	return ret;
 }

 static int ipi_req(const u32 *req, size_t req_len, u32 *res, size_t res_maxlen)
 {
 	struct zynqmp_ipi_msg msg;
 	int ret;
 	u32 buffer[PAYLOAD_ARG_CNT];

 	if (!res)
 		res = buffer;

 	if (req_len > PMUFW_PAYLOAD_ARG_CNT ||
 	    res_maxlen > PMUFW_PAYLOAD_ARG_CNT)
 		return -EINVAL;

 	if (!(zynqmp_power.tx_chan.dev) || !(zynqmp_power.rx_chan.dev)) {
 		ret = do_pm_probe();
 		if (ret)
 			return ret;
 	}

 	debug("%s, Sending IPI message with ID: 0x%0x\n", __func__, req[0]);
 	msg.buf = (u32 *)req;
 	msg.len = req_len;
 	ret = mbox_send(&zynqmp_power.tx_chan, &msg);
 	if (ret) {
 		debug("%s: Sending message failed\n", __func__);
 		return ret;
 	}

 	msg.buf = res;
 	msg.len = res_maxlen;
 	ret = mbox_recv(&zynqmp_power.rx_chan, &msg, 100);
 	if (ret)
 		debug("%s: Receiving message failed\n", __func__);

 	return ret;
 }

 unsigned int zynqmp_firmware_version(void)
 {
 	int ret;
 	u32 ret_payload[PAYLOAD_ARG_CNT];
 	static u32 pm_api_version = ZYNQMP_PM_VERSION_INVALID;

 	/*
 	 * Get PMU version only once and later
 	 * just return stored values instead of
 	 * asking PMUFW again.
 	 **/
 	if (pm_api_version == ZYNQMP_PM_VERSION_INVALID) {

 		ret = xilinx_pm_request(PM_GET_API_VERSION, 0, 0, 0, 0,
 					ret_payload);
 		if (ret)
 			panic("PMUFW is not found - Please load it!\n");

 		pm_api_version = ret_payload[1];
 		if (pm_api_version < ZYNQMP_PM_VERSION)
 			panic("PMUFW version error. Expected: v%d.%d\n",
 			      ZYNQMP_PM_VERSION_MAJOR, ZYNQMP_PM_VERSION_MINOR);
 	}

 	return pm_api_version;
 };

 int zynqmp_pm_set_gem_config(u32 node, enum pm_gem_config_type config, u32 value)
 {
 	int ret;

 	ret = xilinx_pm_request(PM_IOCTL, node, IOCTL_SET_GEM_CONFIG,
 				config, value, NULL);
 	if (ret)
 		printf("%s: node %d: set_gem_config %d failed\n",
 		       __func__, node, config);

 	return ret;
 }

 int zynqmp_pm_set_sd_config(u32 node, enum pm_sd_config_type config, u32 value)
 {
 	int ret;

 	ret = xilinx_pm_request(PM_IOCTL, node, IOCTL_SET_SD_CONFIG,
 				config, value, NULL);
 	if (ret)
 		printf("%s: node %d: set_sd_config %d failed\n",
 		       __func__, node, config);

 	return ret;
 }

 int zynqmp_pm_feature(const u32 api_id)
 {
 	int ret;
 	u32 ret_payload[PAYLOAD_ARG_CNT];

 	/* Check feature check API version */
 	ret = xilinx_pm_request(PM_FEATURE_CHECK, api_id, 0, 0, 0,
 				ret_payload);
 	if (ret)
 		return ret;

 	/* Return feature check version */
 	return ret_payload[1] & FIRMWARE_VERSION_MASK;
 }

 int zynqmp_pm_is_function_supported(const u32 api_id, const u32 id)
 {
 	int ret;
 	u32 *bit_mask;
 	u32 ret_payload[PAYLOAD_ARG_CNT];

 	/* Input arguments validation */
 	if (id >= 64 || (api_id != PM_IOCTL && api_id != PM_QUERY_DATA))
 		return -EINVAL;

 	/* Check feature check API version */
 	ret = xilinx_pm_request(PM_FEATURE_CHECK, PM_FEATURE_CHECK, 0, 0, 0,
 				ret_payload);
 	if (ret)
 		return ret;

 	/* Check if feature check version 2 is supported or not */
 	if ((ret_payload[1] & FIRMWARE_VERSION_MASK) == PM_API_VERSION_2) {
 		/*
 		 * Call feature check for IOCTL/QUERY API to get IOCTL ID or
 		 * QUERY ID feature status.
 		 */

 		ret = xilinx_pm_request(PM_FEATURE_CHECK, api_id, 0, 0, 0,
 					ret_payload);
 		if (ret)
 			return ret;

 		bit_mask = &ret_payload[2];
 		if ((bit_mask[(id / 32)] & BIT((id % 32))) == 0)
 			return -EOPNOTSUPP;
 	} else {
 		return -ENODATA;
 	}

 	return 0;
 }

 /**
  * Send a configuration object to the PMU firmware.
  *
  * @cfg_obj: Pointer to the configuration object
  * @size:    Size of @cfg_obj in bytes
  * Return:   0 on success otherwise negative errno.
  */
 int zynqmp_pmufw_load_config_object(const void *cfg_obj, size_t size)
 {
 	int err;
 	u32 ret_payload[PAYLOAD_ARG_CNT];

 	if (IS_ENABLED(CONFIG_XPL_BUILD))
 		printf("Loading new PMUFW cfg obj (%ld bytes)\n", size);

 	flush_dcache_range((ulong)cfg_obj, (ulong)(cfg_obj + size));

 	err = xilinx_pm_request(PM_SET_CONFIGURATION, (u32)(u64)cfg_obj, 0, 0,
 				0, ret_payload);
 	if (err == XST_PM_NO_ACCESS) {
 		return -EACCES;
 	}

 	if (err == XST_PM_ALREADY_CONFIGURED) {
 		debug("PMUFW Node is already configured\n");
 		return -ENODEV;
 	}

 	if (err)
 		printf("Cannot load PMUFW configuration object (%d)\n", err);

 	if (ret_payload[0])
 		printf("PMUFW returned 0x%08x status!\n", ret_payload[0]);

 	if ((err || ret_payload[0]) && IS_ENABLED(CONFIG_XPL_BUILD))
 		panic("PMUFW config object loading failed in EL3\n");

 	return 0;
 }

 static int zynqmp_power_probe(struct udevice *dev)
 {
 	struct udevice *ipi_dev;
 	ofnode ipi_node;
 	int ret;

 	debug("%s, (dev=%p)\n", __func__, dev);

 	/*
 	 * Probe all IPI parent node driver. It is important to have IPI
 	 * devices available when requested by mbox_get_by* API.
 	 * If IPI device isn't available, then mailbox request fails and
 	 * that causes system boot failure.
 	 * To avoid this make sure all IPI parent drivers are probed here,
 	 * and IPI parent driver binds each child node to mailbox driver.
 	 * This way mbox_get_by_* API will have correct mailbox device
 	 * driver probed.
 	 */
 	ofnode_for_each_compatible_node(ipi_node, "xlnx,zynqmp-ipi-mailbox") {
 		ret = uclass_get_device_by_ofnode(UCLASS_NOP, ipi_node, &ipi_dev);
 		if (ret) {
 			dev_err(dev, "failed to get IPI device from node %s\n",
 				ofnode_get_name(ipi_node));
 			return ret;
 		}
 	}

 	ret = mbox_get_by_name(dev, "tx", &zynqmp_power.tx_chan);
 	if (ret) {
 		debug("%s: Cannot find tx mailbox\n", __func__);
 		return ret;
 	}

 	ret = mbox_get_by_name(dev, "rx", &zynqmp_power.rx_chan);
 	if (ret) {
 		debug("%s: Cannot find rx mailbox\n", __func__);
 		return ret;
 	}

 	ret = zynqmp_firmware_version();
 	printf("PMUFW:\tv%d.%d\n",
 	       ret >> ZYNQMP_PM_VERSION_MAJOR_SHIFT,
 	       ret & ZYNQMP_PM_VERSION_MINOR_MASK);

 	return 0;
 };

 static const struct udevice_id zynqmp_power_ids[] = {
 	{ .compatible = "xlnx,zynqmp-power" },
 	{ }
 };

 U_BOOT_DRIVER(zynqmp_power) = {
 	.name = "zynqmp_power",
 	.id = UCLASS_FIRMWARE,
 	.of_match = zynqmp_power_ids,
 	.probe = zynqmp_power_probe,
 };
 #endif

 int __maybe_unused xilinx_pm_request(u32 api_id, u32 arg0, u32 arg1, u32 arg2,
 				     u32 arg3, u32 *ret_payload)
 {
 	debug("%s at EL%d, API ID: 0x%0x, 0x%0x, 0x%0x, 0x%0x, 0x%0x\n",
 	      __func__, current_el(), api_id, arg0, arg1, arg2, arg3);

 	if (IS_ENABLED(CONFIG_XPL_BUILD) || current_el() == 3) {
 #if defined(CONFIG_ZYNQMP_IPI)
 		/*
 		 * Use fixed payload and arg size as the EL2 call. The firmware
 		 * is capable to handle PMUFW_PAYLOAD_ARG_CNT bytes but the
 		 * firmware API is limited by the SMC call size
 		 */
 		u32 regs[] = {api_id, arg0, arg1, arg2, arg3};
 		int ret;

 		if (api_id == PM_FPGA_LOAD) {
 			/* Swap addr_hi/low because of incompatibility */
 			u32 temp = regs[1];

 			regs[1] = regs[2];
 			regs[2] = temp;
 		}

 		ret = ipi_req(regs, PAYLOAD_ARG_CNT, ret_payload,
 			      PAYLOAD_ARG_CNT);
 		if (ret)
 			return ret;
 #else
 		return -EPERM;
 #endif
 	} else {
 		/*
 		 * Added SIP service call Function Identifier
 		 * Make sure to stay in x0 register
 		 */
 		struct pt_regs regs;

 		regs.regs[0] = PM_SIP_SVC | api_id;
 		regs.regs[1] = ((u64)arg1 << 32) | arg0;
 		regs.regs[2] = ((u64)arg3 << 32) | arg2;

 		smc_call(&regs);

 		if (ret_payload) {
 			ret_payload[0] = (u32)regs.regs[0];
 			ret_payload[1] = upper_32_bits(regs.regs[0]);
 			ret_payload[2] = (u32)regs.regs[1];
 			ret_payload[3] = upper_32_bits(regs.regs[1]);
 			ret_payload[4] = (u32)regs.regs[2];
 		}

 	}
 	return (ret_payload) ? ret_payload[0] : 0;
 }

 static const struct udevice_id zynqmp_firmware_ids[] = {
 	{ .compatible = "xlnx,zynqmp-firmware" },
 	{ .compatible = "xlnx,versal-firmware"},
 	{ .compatible = "xlnx,versal-net-firmware"},
 	{ }
 };

 static int zynqmp_firmware_bind(struct udevice *dev)
 {
 	int ret;
 	struct udevice *child;

 	if ((IS_ENABLED(CONFIG_XPL_BUILD) &&
 	     IS_ENABLED(CONFIG_SPL_POWER_DOMAIN) &&
 	     IS_ENABLED(CONFIG_ZYNQMP_POWER_DOMAIN)) ||
 	     (!IS_ENABLED(CONFIG_XPL_BUILD) &&
 	      IS_ENABLED(CONFIG_ZYNQMP_POWER_DOMAIN))) {
 		ret = device_bind_driver_to_node(dev, "zynqmp_power_domain",
 						 "zynqmp_power_domain",
 						 dev_ofnode(dev), &child);
 		if (ret) {
 			printf("zynqmp power domain driver is not bound: %d\n", ret);
 			return ret;
 		}
 	}

 	return 0;
 }

 U_BOOT_DRIVER(zynqmp_firmware) = {
 	.id = UCLASS_FIRMWARE,
 	.name = "zynqmp_firmware",
 	.of_match = zynqmp_firmware_ids,
 	.bind = zynqmp_firmware_bind,
 };
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Xilinx Zynq MPSoC Firmware driver
	*
	* Copyright (C) 2018-2019 Xilinx, Inc.
	*/

	#include <cpu_func.h>
	#include <dm.h>
	#include <dm/device_compat.h>
	#include <dm/lists.h>
	#include <log.h>
	#include <zynqmp_firmware.h>
	#include <asm/cache.h>
	#include <asm/ptrace.h>

	#if defined(CONFIG_ZYNQMP_IPI)
	#include <mailbox.h>
	#include <asm/arch/sys_proto.h>

	#define PMUFW_PAYLOAD_ARG_CNT 8

	#define XST_PM_NO_ACCESS 2002L
	#define XST_PM_ALREADY_CONFIGURED 2009L

	static struct zynqmp_power {
	struct mbox_chan tx_chan;
	struct mbox_chan rx_chan;
	} zynqmp_power __section(".data");

	#define NODE_ID_LOCATION 5

	static unsigned int xpm_configobject[] = {
	/**********************************************************************/
	/* HEADER */
	2, /* Number of remaining words in the header */
	1, /* Number of sections included in config object */
	PM_CONFIG_OBJECT_TYPE_OVERLAY, /* Type of Config object as overlay */
	/**********************************************************************/
	/* SLAVE SECTION */

	PM_CONFIG_SLAVE_SECTION_ID, /* Section ID */
	1, /* Number of slaves */

	0, /* Node ID which will be changed below */
	PM_SLAVE_FLAG_IS_SHAREABLE,
	PM_CONFIG_IPI_PSU_CORTEXA53_0_MASK \|
	PM_CONFIG_IPI_PSU_CORTEXR5_0_MASK \|
	PM_CONFIG_IPI_PSU_CORTEXR5_1_MASK, /* IPI Mask */
	};

	static unsigned int xpm_configobject_close[] = {
	/**********************************************************************/
	/* HEADER */
	2, /* Number of remaining words in the header */
	1, /* Number of sections included in config object */
	PM_CONFIG_OBJECT_TYPE_OVERLAY, /* Type of Config object as overlay */
	/**********************************************************************/
	/* SET CONFIG SECTION */
	PM_CONFIG_SET_CONFIG_SECTION_ID,
	0U, /* Loading permission to Overlay config object */
	};

	int zynqmp_pmufw_config_close(void)
	{
	return zynqmp_pmufw_load_config_object(xpm_configobject_close,
	sizeof(xpm_configobject_close));
	}

	int zynqmp_pmufw_node(u32 id)
	{
	static bool check = true;
	static bool permission = true;

	if (check) {
	check = false;

	if (zynqmp_pmufw_node(NODE_OCM_BANK_0) == -EACCES) {
	printf("PMUFW: No permission to change config object\n");
	permission = false;
	}
	}

	if (!permission)
	return 0;

	/* Record power domain id */
	xpm_configobject[NODE_ID_LOCATION] = id;

	return zynqmp_pmufw_load_config_object(xpm_configobject,
	sizeof(xpm_configobject));
	}

	static int do_pm_probe(void)
	{
	struct udevice *dev;
	int ret;

	ret = uclass_get_device_by_driver(UCLASS_FIRMWARE,
	DM_DRIVER_GET(zynqmp_power),
	&dev);
	if (ret)
	debug("%s: Probing device failed: %d\n", __func__, ret);

	return ret;
	}

	static int ipi_req(const u32 req, size_t req_len, u32 res, size_t res_maxlen)
	{
	struct zynqmp_ipi_msg msg;
	int ret;
	u32 buffer[PAYLOAD_ARG_CNT];

	if (!res)
	res = buffer;

	if (req_len > PMUFW_PAYLOAD_ARG_CNT \|\|
	res_maxlen > PMUFW_PAYLOAD_ARG_CNT)
	return -EINVAL;

	if (!(zynqmp_power.tx_chan.dev) \|\| !(zynqmp_power.rx_chan.dev)) {
	ret = do_pm_probe();
	if (ret)
	return ret;
	}

	debug("%s, Sending IPI message with ID: 0x%0x\n", __func__, req[0]);
	msg.buf = (u32 *)req;
	msg.len = req_len;
	ret = mbox_send(&zynqmp_power.tx_chan, &msg);
	if (ret) {
	debug("%s: Sending message failed\n", __func__);
	return ret;
	}

	msg.buf = res;
	msg.len = res_maxlen;
	ret = mbox_recv(&zynqmp_power.rx_chan, &msg, 100);
	if (ret)
	debug("%s: Receiving message failed\n", __func__);

	return ret;
	}

	unsigned int zynqmp_firmware_version(void)
	{
	int ret;
	u32 ret_payload[PAYLOAD_ARG_CNT];
	static u32 pm_api_version = ZYNQMP_PM_VERSION_INVALID;

	/*
	* Get PMU version only once and later
	* just return stored values instead of
	* asking PMUFW again.
	**/
	if (pm_api_version == ZYNQMP_PM_VERSION_INVALID) {

	ret = xilinx_pm_request(PM_GET_API_VERSION, 0, 0, 0, 0,
	ret_payload);
	if (ret)
	panic("PMUFW is not found - Please load it!\n");

	pm_api_version = ret_payload[1];
	if (pm_api_version < ZYNQMP_PM_VERSION)
	panic("PMUFW version error. Expected: v%d.%d\n",
	ZYNQMP_PM_VERSION_MAJOR, ZYNQMP_PM_VERSION_MINOR);
	}

	return pm_api_version;
	};

	int zynqmp_pm_set_gem_config(u32 node, enum pm_gem_config_type config, u32 value)
	{
	int ret;

	ret = xilinx_pm_request(PM_IOCTL, node, IOCTL_SET_GEM_CONFIG,
	config, value, NULL);
	if (ret)
	printf("%s: node %d: set_gem_config %d failed\n",
	__func__, node, config);

	return ret;
	}

	int zynqmp_pm_set_sd_config(u32 node, enum pm_sd_config_type config, u32 value)
	{
	int ret;

	ret = xilinx_pm_request(PM_IOCTL, node, IOCTL_SET_SD_CONFIG,
	config, value, NULL);
	if (ret)
	printf("%s: node %d: set_sd_config %d failed\n",
	__func__, node, config);

	return ret;
	}

	int zynqmp_pm_feature(const u32 api_id)
	{
	int ret;
	u32 ret_payload[PAYLOAD_ARG_CNT];

	/* Check feature check API version */
	ret = xilinx_pm_request(PM_FEATURE_CHECK, api_id, 0, 0, 0,
	ret_payload);
	if (ret)
	return ret;

	/* Return feature check version */
	return ret_payload[1] & FIRMWARE_VERSION_MASK;
	}

	int zynqmp_pm_is_function_supported(const u32 api_id, const u32 id)
	{
	int ret;
	u32 *bit_mask;
	u32 ret_payload[PAYLOAD_ARG_CNT];

	/* Input arguments validation */
	if (id >= 64 \|\| (api_id != PM_IOCTL && api_id != PM_QUERY_DATA))
	return -EINVAL;

	/* Check feature check API version */
	ret = xilinx_pm_request(PM_FEATURE_CHECK, PM_FEATURE_CHECK, 0, 0, 0,
	ret_payload);
	if (ret)
	return ret;

	/* Check if feature check version 2 is supported or not */
	if ((ret_payload[1] & FIRMWARE_VERSION_MASK) == PM_API_VERSION_2) {
	/*
	* Call feature check for IOCTL/QUERY API to get IOCTL ID or
	* QUERY ID feature status.
	*/

	ret = xilinx_pm_request(PM_FEATURE_CHECK, api_id, 0, 0, 0,
	ret_payload);
	if (ret)
	return ret;

	bit_mask = &ret_payload[2];
	if ((bit_mask[(id / 32)] & BIT((id % 32))) == 0)
	return -EOPNOTSUPP;
	} else {
	return -ENODATA;
	}

	return 0;
	}

	/**
	* Send a configuration object to the PMU firmware.
	*
	* @cfg_obj: Pointer to the configuration object
	* @size: Size of @cfg_obj in bytes
	* Return: 0 on success otherwise negative errno.
	*/
	int zynqmp_pmufw_load_config_object(const void *cfg_obj, size_t size)
	{
	int err;
	u32 ret_payload[PAYLOAD_ARG_CNT];

	if (IS_ENABLED(CONFIG_XPL_BUILD))
	printf("Loading new PMUFW cfg obj (%ld bytes)\n", size);

	flush_dcache_range((ulong)cfg_obj, (ulong)(cfg_obj + size));

	err = xilinx_pm_request(PM_SET_CONFIGURATION, (u32)(u64)cfg_obj, 0, 0,
	0, ret_payload);
	if (err == XST_PM_NO_ACCESS) {
	return -EACCES;
	}

	if (err == XST_PM_ALREADY_CONFIGURED) {
	debug("PMUFW Node is already configured\n");
	return -ENODEV;
	}

	if (err)
	printf("Cannot load PMUFW configuration object (%d)\n", err);

	if (ret_payload[0])
	printf("PMUFW returned 0x%08x status!\n", ret_payload[0]);

	if ((err \|\| ret_payload[0]) && IS_ENABLED(CONFIG_XPL_BUILD))
	panic("PMUFW config object loading failed in EL3\n");

	return 0;
	}

	static int zynqmp_power_probe(struct udevice *dev)
	{
	struct udevice *ipi_dev;
	ofnode ipi_node;
	int ret;

	debug("%s, (dev=%p)\n", __func__, dev);

	/*
	* Probe all IPI parent node driver. It is important to have IPI
	* devices available when requested by mbox_get_by* API.
	* If IPI device isn't available, then mailbox request fails and
	* that causes system boot failure.
	* To avoid this make sure all IPI parent drivers are probed here,
	* and IPI parent driver binds each child node to mailbox driver.
	* This way mbox_get_by_* API will have correct mailbox device
	* driver probed.
	*/
	ofnode_for_each_compatible_node(ipi_node, "xlnx,zynqmp-ipi-mailbox") {
	ret = uclass_get_device_by_ofnode(UCLASS_NOP, ipi_node, &ipi_dev);
	if (ret) {
	dev_err(dev, "failed to get IPI device from node %s\n",
	ofnode_get_name(ipi_node));
	return ret;
	}
	}

	ret = mbox_get_by_name(dev, "tx", &zynqmp_power.tx_chan);
	if (ret) {
	debug("%s: Cannot find tx mailbox\n", __func__);
	return ret;
	}

	ret = mbox_get_by_name(dev, "rx", &zynqmp_power.rx_chan);
	if (ret) {
	debug("%s: Cannot find rx mailbox\n", __func__);
	return ret;
	}

	ret = zynqmp_firmware_version();
	printf("PMUFW:\tv%d.%d\n",
	ret >> ZYNQMP_PM_VERSION_MAJOR_SHIFT,
	ret & ZYNQMP_PM_VERSION_MINOR_MASK);

	return 0;
	};

	static const struct udevice_id zynqmp_power_ids[] = {
	{ .compatible = "xlnx,zynqmp-power" },
	{ }
	};

	U_BOOT_DRIVER(zynqmp_power) = {
	.name = "zynqmp_power",
	.id = UCLASS_FIRMWARE,
	.of_match = zynqmp_power_ids,
	.probe = zynqmp_power_probe,
	};
	#endif

	int __maybe_unused xilinx_pm_request(u32 api_id, u32 arg0, u32 arg1, u32 arg2,
	u32 arg3, u32 *ret_payload)
	{
	debug("%s at EL%d, API ID: 0x%0x, 0x%0x, 0x%0x, 0x%0x, 0x%0x\n",
	__func__, current_el(), api_id, arg0, arg1, arg2, arg3);

	if (IS_ENABLED(CONFIG_XPL_BUILD) \|\| current_el() == 3) {
	#if defined(CONFIG_ZYNQMP_IPI)
	/*
	* Use fixed payload and arg size as the EL2 call. The firmware
	* is capable to handle PMUFW_PAYLOAD_ARG_CNT bytes but the
	* firmware API is limited by the SMC call size
	*/
	u32 regs[] = {api_id, arg0, arg1, arg2, arg3};
	int ret;

	if (api_id == PM_FPGA_LOAD) {
	/* Swap addr_hi/low because of incompatibility */
	u32 temp = regs[1];

	regs[1] = regs[2];
	regs[2] = temp;
	}

	ret = ipi_req(regs, PAYLOAD_ARG_CNT, ret_payload,
	PAYLOAD_ARG_CNT);
	if (ret)
	return ret;
	#else
	return -EPERM;
	#endif
	} else {
	/*
	* Added SIP service call Function Identifier
	* Make sure to stay in x0 register
	*/
	struct pt_regs regs;

	regs.regs[0] = PM_SIP_SVC \| api_id;
	regs.regs[1] = ((u64)arg1 << 32) \| arg0;
	regs.regs[2] = ((u64)arg3 << 32) \| arg2;

	smc_call(&regs);

	if (ret_payload) {
	ret_payload[0] = (u32)regs.regs[0];
	ret_payload[1] = upper_32_bits(regs.regs[0]);
	ret_payload[2] = (u32)regs.regs[1];
	ret_payload[3] = upper_32_bits(regs.regs[1]);
	ret_payload[4] = (u32)regs.regs[2];
	}

	}
	return (ret_payload) ? ret_payload[0] : 0;
	}

	static const struct udevice_id zynqmp_firmware_ids[] = {
	{ .compatible = "xlnx,zynqmp-firmware" },
	{ .compatible = "xlnx,versal-firmware"},
	{ .compatible = "xlnx,versal-net-firmware"},
	{ }
	};

	static int zynqmp_firmware_bind(struct udevice *dev)
	{
	int ret;
	struct udevice *child;

	if ((IS_ENABLED(CONFIG_XPL_BUILD) &&
	IS_ENABLED(CONFIG_SPL_POWER_DOMAIN) &&
	IS_ENABLED(CONFIG_ZYNQMP_POWER_DOMAIN)) \|\|
	(!IS_ENABLED(CONFIG_XPL_BUILD) &&
	IS_ENABLED(CONFIG_ZYNQMP_POWER_DOMAIN))) {
	ret = device_bind_driver_to_node(dev, "zynqmp_power_domain",
	"zynqmp_power_domain",
	dev_ofnode(dev), &child);
	if (ret) {
	printf("zynqmp power domain driver is not bound: %d\n", ret);
	return ret;
	}
	}

	return 0;
	}

	U_BOOT_DRIVER(zynqmp_firmware) = {
	.id = UCLASS_FIRMWARE,
	.name = "zynqmp_firmware",
	.of_match = zynqmp_firmware_ids,
	.bind = zynqmp_firmware_bind,
	};