drivers/misc/qfw.c - platform/external/u-boot - Gitiles

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
  * (C) Copyright 2021 Asherah Connor <ashe@kivikakk.ee>
  */

 #define LOG_CATEGORY UCLASS_QFW

 #include <common.h>
 #include <acpi/acpi_table.h>
 #include <bootdev.h>
 #include <bootflow.h>
 #include <bootmeth.h>
 #include <command.h>
 #include <errno.h>
 #include <log.h>
 #include <malloc.h>
 #include <qfw.h>
 #include <dm.h>
 #include <misc.h>
 #include <tables_csum.h>
 #include <asm/acpi_table.h>

 #if defined(CONFIG_GENERATE_ACPI_TABLE) && !defined(CONFIG_SANDBOX)
 /*
  * This function allocates memory for ACPI tables
  *
  * @entry : BIOS linker command entry which tells where to allocate memory
  *          (either high memory or low memory)
  * @addr  : The address that should be used for low memory allcation. If the
  *          memory allocation request is 'ZONE_HIGH' then this parameter will
  *          be ignored.
  * @return: 0 on success, or negative value on failure
  */
 static int bios_linker_allocate(struct udevice *dev,
 				struct bios_linker_entry *entry, ulong *addr)
 {
 	uint32_t size, align;
 	struct fw_file *file;
 	unsigned long aligned_addr;

 	align = le32_to_cpu(entry->alloc.align);
 	/* align must be power of 2 */
 	if (align & (align - 1)) {
 		printf("error: wrong alignment %u\n", align);
 		return -EINVAL;
 	}

 	file = qfw_find_file(dev, entry->alloc.file);
 	if (!file) {
 		printf("error: can't find file %s\n", entry->alloc.file);
 		return -ENOENT;
 	}

 	size = be32_to_cpu(file->cfg.size);

 	/*
 	 * ZONE_HIGH means we need to allocate from high memory, since
 	 * malloc space is already at the end of RAM, so we directly use it.
 	 * If allocation zone is ZONE_FSEG, then we use the 'addr' passed
 	 * in which is low memory
 	 */
 	if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH) {
 		aligned_addr = (unsigned long)memalign(align, size);
 		if (!aligned_addr) {
 			printf("error: allocating resource\n");
 			return -ENOMEM;
 		}
 		if (aligned_addr < gd->arch.table_start_high)
 			gd->arch.table_start_high = aligned_addr;
 		if (aligned_addr + size > gd->arch.table_end_high)
 			gd->arch.table_end_high = aligned_addr + size;

 	} else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) {
 		aligned_addr = ALIGN(*addr, align);
 	} else {
 		printf("error: invalid allocation zone\n");
 		return -EINVAL;
 	}

 	debug("bios_linker_allocate: allocate file %s, size %u, zone %d, align %u, addr 0x%lx\n",
 	      file->cfg.name, size, entry->alloc.zone, align, aligned_addr);

 	qfw_read_entry(dev, be16_to_cpu(file->cfg.select), size,
 		       (void *)aligned_addr);
 	file->addr = aligned_addr;

 	/* adjust address for low memory allocation */
 	if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG)
 		*addr = (aligned_addr + size);

 	return 0;
 }

 /*
  * This function patches ACPI tables previously loaded
  * by bios_linker_allocate()
  *
  * @entry : BIOS linker command entry which tells how to patch
  *          ACPI tables
  * @return: 0 on success, or negative value on failure
  */
 static int bios_linker_add_pointer(struct udevice *dev,
 				   struct bios_linker_entry *entry)
 {
 	struct fw_file *dest, *src;
 	uint32_t offset = le32_to_cpu(entry->pointer.offset);
 	uint64_t pointer = 0;

 	dest = qfw_find_file(dev, entry->pointer.dest_file);
 	if (!dest || !dest->addr)
 		return -ENOENT;
 	src = qfw_find_file(dev, entry->pointer.src_file);
 	if (!src || !src->addr)
 		return -ENOENT;

 	debug("bios_linker_add_pointer: dest->addr 0x%lx, src->addr 0x%lx, offset 0x%x size %u, 0x%llx\n",
 	      dest->addr, src->addr, offset, entry->pointer.size, pointer);

 	memcpy(&pointer, (char *)dest->addr + offset, entry->pointer.size);
 	pointer	= le64_to_cpu(pointer);
 	pointer += (unsigned long)src->addr;
 	pointer	= cpu_to_le64(pointer);
 	memcpy((char *)dest->addr + offset, &pointer, entry->pointer.size);

 	return 0;
 }

 /*
  * This function updates checksum fields of ACPI tables previously loaded
  * by bios_linker_allocate()
  *
  * @entry : BIOS linker command entry which tells where to update ACPI table
  *          checksums
  * @return: 0 on success, or negative value on failure
  */
 static int bios_linker_add_checksum(struct udevice *dev,
 				    struct bios_linker_entry *entry)
 {
 	struct fw_file *file;
 	uint8_t *data, cksum = 0;
 	uint8_t *cksum_start;

 	file = qfw_find_file(dev, entry->cksum.file);
 	if (!file || !file->addr)
 		return -ENOENT;

 	data = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.offset));
 	cksum_start = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.start));
 	cksum = table_compute_checksum(cksum_start,
 				       le32_to_cpu(entry->cksum.length));
 	*data = cksum;

 	return 0;
 }

 /* This function loads and patches ACPI tables provided by QEMU */
 ulong write_acpi_tables(ulong addr)
 {
 	int i, ret;
 	struct fw_file *file;
 	struct bios_linker_entry *table_loader;
 	struct bios_linker_entry *entry;
 	uint32_t size;
 	struct udevice *dev;

 	ret = qfw_get_dev(&dev);
 	if (ret) {
 		printf("error: no qfw\n");
 		return addr;
 	}

 	/* make sure fw_list is loaded */
 	ret = qfw_read_firmware_list(dev);
 	if (ret) {
 		printf("error: can't read firmware file list\n");
 		return addr;
 	}

 	file = qfw_find_file(dev, "etc/table-loader");
 	if (!file) {
 		printf("error: can't find etc/table-loader\n");
 		return addr;
 	}

 	size = be32_to_cpu(file->cfg.size);
 	if ((size % sizeof(*entry)) != 0) {
 		printf("error: table-loader maybe corrupted\n");
 		return addr;
 	}

 	table_loader = malloc(size);
 	if (!table_loader) {
 		printf("error: no memory for table-loader\n");
 		return addr;
 	}

 	/* QFW always puts tables at high addresses */
 	gd->arch.table_start_high = (ulong)table_loader;
 	gd->arch.table_end_high = (ulong)table_loader;

 	qfw_read_entry(dev, be16_to_cpu(file->cfg.select), size, table_loader);

 	for (i = 0; i < (size / sizeof(*entry)); i++) {
 		entry = table_loader + i;
 		switch (le32_to_cpu(entry->command)) {
 		case BIOS_LINKER_LOADER_COMMAND_ALLOCATE:
 			ret = bios_linker_allocate(dev, entry, &addr);
 			if (ret)
 				goto out;
 			break;
 		case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER:
 			ret = bios_linker_add_pointer(dev, entry);
 			if (ret)
 				goto out;
 			break;
 		case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM:
 			ret = bios_linker_add_checksum(dev, entry);
 			if (ret)
 				goto out;
 			break;
 		default:
 			break;
 		}
 	}

 out:
 	if (ret) {
 		struct fw_cfg_file_iter iter;
 		for (file = qfw_file_iter_init(dev, &iter);
 		     !qfw_file_iter_end(&iter);
 		     file = qfw_file_iter_next(&iter)) {
 			if (file->addr) {
 				free((void *)file->addr);
 				file->addr = 0;
 			}
 		}
 	}

 	free(table_loader);

 	gd_set_acpi_start(acpi_get_rsdp_addr());

 	return addr;
 }

 ulong acpi_get_rsdp_addr(void)
 {
 	int ret;
 	struct fw_file *file;
 	struct udevice *dev;

 	ret = qfw_get_dev(&dev);
 	if (ret) {
 		printf("error: no qfw\n");
 		return 0;
 	}

 	file = qfw_find_file(dev, "etc/acpi/rsdp");
 	return file->addr;
 }
 #endif

 static void qfw_read_entry_io(struct qfw_dev *qdev, u16 entry, u32 size,
 			      void *address)
 {
 	struct dm_qfw_ops *ops = dm_qfw_get_ops(qdev->dev);

 	debug("%s: entry 0x%x, size %u address %p\n", __func__, entry, size,
 	      address);

 	ops->read_entry_io(qdev->dev, entry, size, address);
 }

 static void qfw_read_entry_dma(struct qfw_dev *qdev, u16 entry, u32 size,
 			       void *address)
 {
 	struct dm_qfw_ops *ops = dm_qfw_get_ops(qdev->dev);

 	struct qfw_dma dma = {
 		.length = cpu_to_be32(size),
 		.address = cpu_to_be64((uintptr_t)address),
 		.control = cpu_to_be32(FW_CFG_DMA_READ),
 	};

 	/*
 	 * writing FW_CFG_INVALID will cause read operation to resume at last
 	 * offset, otherwise read will start at offset 0
 	 */
 	if (entry != FW_CFG_INVALID)
 		dma.control |= cpu_to_be32(FW_CFG_DMA_SELECT | (entry << 16));

 	debug("%s: entry 0x%x, size %u address %p, control 0x%x\n", __func__,
 	      entry, size, address, be32_to_cpu(dma.control));

 	barrier();

 	ops->read_entry_dma(qdev->dev, &dma);
 }

 void qfw_read_entry(struct udevice *dev, u16 entry, u32 size, void *address)
 {
 	struct qfw_dev *qdev = dev_get_uclass_priv(dev);

 	if (qdev->dma_present)
 		qfw_read_entry_dma(qdev, entry, size, address);
 	else
 		qfw_read_entry_io(qdev, entry, size, address);
 }

 int qfw_register(struct udevice *dev)
 {
 	struct qfw_dev *qdev = dev_get_uclass_priv(dev);
 	u32 qemu, dma_enabled;

 	qdev->dev = dev;
 	INIT_LIST_HEAD(&qdev->fw_list);

 	qfw_read_entry_io(qdev, FW_CFG_SIGNATURE, 4, &qemu);
 	if (be32_to_cpu(qemu) != QEMU_FW_CFG_SIGNATURE)
 		return -ENODEV;

 	qfw_read_entry_io(qdev, FW_CFG_ID, 1, &dma_enabled);
 	if (dma_enabled & FW_CFG_DMA_ENABLED)
 		qdev->dma_present = true;

 	return 0;
 }

 static int qfw_post_bind(struct udevice *dev)
 {
 	int ret;

 	ret = bootdev_setup_for_dev(dev, "qfw_bootdev");
 	if (ret)
 		return log_msg_ret("dev", ret);

 	return 0;
 }

 static int qfw_get_bootflow(struct udevice *dev, struct bootflow_iter *iter,
 			    struct bootflow *bflow)
 {
 	const struct udevice *media = dev_get_parent(dev);
 	int ret;

 	if (!CONFIG_IS_ENABLED(BOOTSTD))
 		return -ENOSYS;

 	log_debug("media=%s\n", media->name);
 	ret = bootmeth_check(bflow->method, iter);
 	if (ret)
 		return log_msg_ret("check", ret);

 	log_debug("iter->part=%d\n", iter->part);

 	/* We only support the whole device, not partitions */
 	if (iter->part)
 		return log_msg_ret("max", -ESHUTDOWN);

 	log_debug("reading bootflow with method: %s\n", bflow->method->name);
 	ret = bootmeth_read_bootflow(bflow->method, bflow);
 	if (ret)
 		return log_msg_ret("method", ret);

 	return 0;
 }

 static int qfw_bootdev_bind(struct udevice *dev)
 {
 	struct bootdev_uc_plat *ucp = dev_get_uclass_plat(dev);

 	ucp->prio = BOOTDEVP_4_SCAN_FAST;

 	return 0;
 }

 static int qfw_bootdev_hunt(struct bootdev_hunter *info, bool show)
 {
 	int ret;

 	ret = uclass_probe_all(UCLASS_QFW);
 	if (ret && ret != -ENOENT)
 		return log_msg_ret("vir", ret);

 	return 0;
 }

 UCLASS_DRIVER(qfw) = {
 	.id		= UCLASS_QFW,
 	.name		= "qfw",
 	.post_bind	= qfw_post_bind,
 	.per_device_auto	= sizeof(struct qfw_dev),
 };

 struct bootdev_ops qfw_bootdev_ops = {
 	.get_bootflow	= qfw_get_bootflow,
 };

 static const struct udevice_id qfw_bootdev_ids[] = {
 	{ .compatible = "u-boot,bootdev-qfw" },
 	{ }
 };

 U_BOOT_DRIVER(qfw_bootdev) = {
 	.name		= "qfw_bootdev",
 	.id		= UCLASS_BOOTDEV,
 	.ops		= &qfw_bootdev_ops,
 	.bind		= qfw_bootdev_bind,
 	.of_match	= qfw_bootdev_ids,
 };

 BOOTDEV_HUNTER(qfw_bootdev_hunter) = {
 	.prio		= BOOTDEVP_4_SCAN_FAST,
 	.uclass		= UCLASS_QFW,
 	.hunt		= qfw_bootdev_hunt,
 	.drv		= DM_DRIVER_REF(qfw_bootdev),
 };
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* (C) Copyright 2015 Miao Yan <yanmiaobest@gmail.com>
	* (C) Copyright 2021 Asherah Connor <ashe@kivikakk.ee>
	*/

	#define LOG_CATEGORY UCLASS_QFW

	#include <common.h>
	#include <acpi/acpi_table.h>
	#include <bootdev.h>
	#include <bootflow.h>
	#include <bootmeth.h>
	#include <command.h>
	#include <errno.h>
	#include <log.h>
	#include <malloc.h>
	#include <qfw.h>
	#include <dm.h>
	#include <misc.h>
	#include <tables_csum.h>
	#include <asm/acpi_table.h>

	#if defined(CONFIG_GENERATE_ACPI_TABLE) && !defined(CONFIG_SANDBOX)
	/*
	* This function allocates memory for ACPI tables
	*
	* @entry : BIOS linker command entry which tells where to allocate memory
	* (either high memory or low memory)
	* @addr : The address that should be used for low memory allcation. If the
	* memory allocation request is 'ZONE_HIGH' then this parameter will
	* be ignored.
	* @return: 0 on success, or negative value on failure
	*/
	static int bios_linker_allocate(struct udevice *dev,
	struct bios_linker_entry entry, ulong addr)
	{
	uint32_t size, align;
	struct fw_file *file;
	unsigned long aligned_addr;

	align = le32_to_cpu(entry->alloc.align);
	/* align must be power of 2 */
	if (align & (align - 1)) {
	printf("error: wrong alignment %u\n", align);
	return -EINVAL;
	}

	file = qfw_find_file(dev, entry->alloc.file);
	if (!file) {
	printf("error: can't find file %s\n", entry->alloc.file);
	return -ENOENT;
	}

	size = be32_to_cpu(file->cfg.size);

	/*
	* ZONE_HIGH means we need to allocate from high memory, since
	* malloc space is already at the end of RAM, so we directly use it.
	* If allocation zone is ZONE_FSEG, then we use the 'addr' passed
	* in which is low memory
	*/
	if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_HIGH) {
	aligned_addr = (unsigned long)memalign(align, size);
	if (!aligned_addr) {
	printf("error: allocating resource\n");
	return -ENOMEM;
	}
	if (aligned_addr < gd->arch.table_start_high)
	gd->arch.table_start_high = aligned_addr;
	if (aligned_addr + size > gd->arch.table_end_high)
	gd->arch.table_end_high = aligned_addr + size;

	} else if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG) {
	aligned_addr = ALIGN(*addr, align);
	} else {
	printf("error: invalid allocation zone\n");
	return -EINVAL;
	}

	debug("bios_linker_allocate: allocate file %s, size %u, zone %d, align %u, addr 0x%lx\n",
	file->cfg.name, size, entry->alloc.zone, align, aligned_addr);

	qfw_read_entry(dev, be16_to_cpu(file->cfg.select), size,
	(void *)aligned_addr);
	file->addr = aligned_addr;

	/* adjust address for low memory allocation */
	if (entry->alloc.zone == BIOS_LINKER_LOADER_ALLOC_ZONE_FSEG)
	*addr = (aligned_addr + size);

	return 0;
	}

	/*
	* This function patches ACPI tables previously loaded
	* by bios_linker_allocate()
	*
	* @entry : BIOS linker command entry which tells how to patch
	* ACPI tables
	* @return: 0 on success, or negative value on failure
	*/
	static int bios_linker_add_pointer(struct udevice *dev,
	struct bios_linker_entry *entry)
	{
	struct fw_file dest, src;
	uint32_t offset = le32_to_cpu(entry->pointer.offset);
	uint64_t pointer = 0;

	dest = qfw_find_file(dev, entry->pointer.dest_file);
	if (!dest \|\| !dest->addr)
	return -ENOENT;
	src = qfw_find_file(dev, entry->pointer.src_file);
	if (!src \|\| !src->addr)
	return -ENOENT;

	debug("bios_linker_add_pointer: dest->addr 0x%lx, src->addr 0x%lx, offset 0x%x size %u, 0x%llx\n",
	dest->addr, src->addr, offset, entry->pointer.size, pointer);

	memcpy(&pointer, (char *)dest->addr + offset, entry->pointer.size);
	pointer = le64_to_cpu(pointer);
	pointer += (unsigned long)src->addr;
	pointer = cpu_to_le64(pointer);
	memcpy((char *)dest->addr + offset, &pointer, entry->pointer.size);

	return 0;
	}

	/*
	* This function updates checksum fields of ACPI tables previously loaded
	* by bios_linker_allocate()
	*
	* @entry : BIOS linker command entry which tells where to update ACPI table
	* checksums
	* @return: 0 on success, or negative value on failure
	*/
	static int bios_linker_add_checksum(struct udevice *dev,
	struct bios_linker_entry *entry)
	{
	struct fw_file *file;
	uint8_t *data, cksum = 0;
	uint8_t *cksum_start;

	file = qfw_find_file(dev, entry->cksum.file);
	if (!file \|\| !file->addr)
	return -ENOENT;

	data = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.offset));
	cksum_start = (uint8_t *)(file->addr + le32_to_cpu(entry->cksum.start));
	cksum = table_compute_checksum(cksum_start,
	le32_to_cpu(entry->cksum.length));
	*data = cksum;

	return 0;
	}

	/* This function loads and patches ACPI tables provided by QEMU */
	ulong write_acpi_tables(ulong addr)
	{
	int i, ret;
	struct fw_file *file;
	struct bios_linker_entry *table_loader;
	struct bios_linker_entry *entry;
	uint32_t size;
	struct udevice *dev;

	ret = qfw_get_dev(&dev);
	if (ret) {
	printf("error: no qfw\n");
	return addr;
	}

	/* make sure fw_list is loaded */
	ret = qfw_read_firmware_list(dev);
	if (ret) {
	printf("error: can't read firmware file list\n");
	return addr;
	}

	file = qfw_find_file(dev, "etc/table-loader");
	if (!file) {
	printf("error: can't find etc/table-loader\n");
	return addr;
	}

	size = be32_to_cpu(file->cfg.size);
	if ((size % sizeof(*entry)) != 0) {
	printf("error: table-loader maybe corrupted\n");
	return addr;
	}

	table_loader = malloc(size);
	if (!table_loader) {
	printf("error: no memory for table-loader\n");
	return addr;
	}

	/* QFW always puts tables at high addresses */
	gd->arch.table_start_high = (ulong)table_loader;
	gd->arch.table_end_high = (ulong)table_loader;

	qfw_read_entry(dev, be16_to_cpu(file->cfg.select), size, table_loader);

	for (i = 0; i < (size / sizeof(*entry)); i++) {
	entry = table_loader + i;
	switch (le32_to_cpu(entry->command)) {
	case BIOS_LINKER_LOADER_COMMAND_ALLOCATE:
	ret = bios_linker_allocate(dev, entry, &addr);
	if (ret)
	goto out;
	break;
	case BIOS_LINKER_LOADER_COMMAND_ADD_POINTER:
	ret = bios_linker_add_pointer(dev, entry);
	if (ret)
	goto out;
	break;
	case BIOS_LINKER_LOADER_COMMAND_ADD_CHECKSUM:
	ret = bios_linker_add_checksum(dev, entry);
	if (ret)
	goto out;
	break;
	default:
	break;
	}
	}

	out:
	if (ret) {
	struct fw_cfg_file_iter iter;
	for (file = qfw_file_iter_init(dev, &iter);
	!qfw_file_iter_end(&iter);
	file = qfw_file_iter_next(&iter)) {
	if (file->addr) {
	free((void *)file->addr);
	file->addr = 0;
	}
	}
	}

	free(table_loader);

	gd_set_acpi_start(acpi_get_rsdp_addr());

	return addr;
	}

	ulong acpi_get_rsdp_addr(void)
	{
	int ret;
	struct fw_file *file;
	struct udevice *dev;

	ret = qfw_get_dev(&dev);
	if (ret) {
	printf("error: no qfw\n");
	return 0;
	}

	file = qfw_find_file(dev, "etc/acpi/rsdp");
	return file->addr;
	}
	#endif

	static void qfw_read_entry_io(struct qfw_dev *qdev, u16 entry, u32 size,
	void *address)
	{
	struct dm_qfw_ops *ops = dm_qfw_get_ops(qdev->dev);

	debug("%s: entry 0x%x, size %u address %p\n", __func__, entry, size,
	address);

	ops->read_entry_io(qdev->dev, entry, size, address);
	}

	static void qfw_read_entry_dma(struct qfw_dev *qdev, u16 entry, u32 size,
	void *address)
	{
	struct dm_qfw_ops *ops = dm_qfw_get_ops(qdev->dev);

	struct qfw_dma dma = {
	.length = cpu_to_be32(size),
	.address = cpu_to_be64((uintptr_t)address),
	.control = cpu_to_be32(FW_CFG_DMA_READ),
	};

	/*
	* writing FW_CFG_INVALID will cause read operation to resume at last
	* offset, otherwise read will start at offset 0
	*/
	if (entry != FW_CFG_INVALID)
	dma.control \|= cpu_to_be32(FW_CFG_DMA_SELECT \| (entry << 16));

	debug("%s: entry 0x%x, size %u address %p, control 0x%x\n", __func__,
	entry, size, address, be32_to_cpu(dma.control));

	barrier();

	ops->read_entry_dma(qdev->dev, &dma);
	}

	void qfw_read_entry(struct udevice dev, u16 entry, u32 size, void address)
	{
	struct qfw_dev *qdev = dev_get_uclass_priv(dev);

	if (qdev->dma_present)
	qfw_read_entry_dma(qdev, entry, size, address);
	else
	qfw_read_entry_io(qdev, entry, size, address);
	}

	int qfw_register(struct udevice *dev)
	{
	struct qfw_dev *qdev = dev_get_uclass_priv(dev);
	u32 qemu, dma_enabled;

	qdev->dev = dev;
	INIT_LIST_HEAD(&qdev->fw_list);

	qfw_read_entry_io(qdev, FW_CFG_SIGNATURE, 4, &qemu);
	if (be32_to_cpu(qemu) != QEMU_FW_CFG_SIGNATURE)
	return -ENODEV;

	qfw_read_entry_io(qdev, FW_CFG_ID, 1, &dma_enabled);
	if (dma_enabled & FW_CFG_DMA_ENABLED)
	qdev->dma_present = true;

	return 0;
	}

	static int qfw_post_bind(struct udevice *dev)
	{
	int ret;

	ret = bootdev_setup_for_dev(dev, "qfw_bootdev");
	if (ret)
	return log_msg_ret("dev", ret);

	return 0;
	}

	static int qfw_get_bootflow(struct udevice dev, struct bootflow_iter iter,
	struct bootflow *bflow)
	{
	const struct udevice *media = dev_get_parent(dev);
	int ret;

	if (!CONFIG_IS_ENABLED(BOOTSTD))
	return -ENOSYS;

	log_debug("media=%s\n", media->name);
	ret = bootmeth_check(bflow->method, iter);
	if (ret)
	return log_msg_ret("check", ret);

	log_debug("iter->part=%d\n", iter->part);

	/* We only support the whole device, not partitions */
	if (iter->part)
	return log_msg_ret("max", -ESHUTDOWN);

	log_debug("reading bootflow with method: %s\n", bflow->method->name);
	ret = bootmeth_read_bootflow(bflow->method, bflow);
	if (ret)
	return log_msg_ret("method", ret);

	return 0;
	}

	static int qfw_bootdev_bind(struct udevice *dev)
	{
	struct bootdev_uc_plat *ucp = dev_get_uclass_plat(dev);

	ucp->prio = BOOTDEVP_4_SCAN_FAST;

	return 0;
	}

	static int qfw_bootdev_hunt(struct bootdev_hunter *info, bool show)
	{
	int ret;

	ret = uclass_probe_all(UCLASS_QFW);
	if (ret && ret != -ENOENT)
	return log_msg_ret("vir", ret);

	return 0;
	}

	UCLASS_DRIVER(qfw) = {
	.id = UCLASS_QFW,
	.name = "qfw",
	.post_bind = qfw_post_bind,
	.per_device_auto = sizeof(struct qfw_dev),
	};

	struct bootdev_ops qfw_bootdev_ops = {
	.get_bootflow = qfw_get_bootflow,
	};

	static const struct udevice_id qfw_bootdev_ids[] = {
	{ .compatible = "u-boot,bootdev-qfw" },
	{ }
	};

	U_BOOT_DRIVER(qfw_bootdev) = {
	.name = "qfw_bootdev",
	.id = UCLASS_BOOTDEV,
	.ops = &qfw_bootdev_ops,
	.bind = qfw_bootdev_bind,
	.of_match = qfw_bootdev_ids,
	};

	BOOTDEV_HUNTER(qfw_bootdev_hunter) = {
	.prio = BOOTDEVP_4_SCAN_FAST,
	.uclass = UCLASS_QFW,
	.hunt = qfw_bootdev_hunt,
	.drv = DM_DRIVER_REF(qfw_bootdev),
	};