[linux-block.git] / drivers / firmware / raspberrypi.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Defines interfaces for interacting wtih the Raspberry Pi firmware's
 * property channel.
 *
 * Copyright © 2015 Broadcom
 */

#include <linux/dma-mapping.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <soc/bcm2835/raspberrypi-firmware.h>

#define MBOX_MSG(chan, data28)		(((data28) & ~0xf) | ((chan) & 0xf))
#define MBOX_CHAN(msg)			((msg) & 0xf)
#define MBOX_DATA28(msg)		((msg) & ~0xf)
#define MBOX_CHAN_PROPERTY		8

#define VL805_PCI_CONFIG_VERSION_OFFSET		0x50

static struct platform_device *rpi_hwmon;
static struct platform_device *rpi_clk;

struct rpi_firmware {
	struct mbox_client cl;
	struct mbox_chan *chan; /* The property channel. */
	struct completion c;
	u32 enabled;
};

static DEFINE_MUTEX(transaction_lock);

static void response_callback(struct mbox_client *cl, void *msg)
{
	struct rpi_firmware *fw = container_of(cl, struct rpi_firmware, cl);
	complete(&fw->c);
}

/*
 * Sends a request to the firmware through the BCM2835 mailbox driver,
 * and synchronously waits for the reply.
 */
static int
rpi_firmware_transaction(struct rpi_firmware *fw, u32 chan, u32 data)
{
	u32 message = MBOX_MSG(chan, data);
	int ret;

	WARN_ON(data & 0xf);

	mutex_lock(&transaction_lock);
	reinit_completion(&fw->c);
	ret = mbox_send_message(fw->chan, &message);
	if (ret >= 0) {
		if (wait_for_completion_timeout(&fw->c, HZ)) {
			ret = 0;
		} else {
			ret = -ETIMEDOUT;
			WARN_ONCE(1, "Firmware transaction timeout");
		}
	} else {
		dev_err(fw->cl.dev, "mbox_send_message returned %d\n", ret);
	}
	mutex_unlock(&transaction_lock);

	return ret;
}

/**
 * rpi_firmware_property_list - Submit firmware property list
 * @fw:		Pointer to firmware structure from rpi_firmware_get().
 * @data:	Buffer holding tags.
 * @tag_size:	Size of tags buffer.
 *
 * Submits a set of concatenated tags to the VPU firmware through the
 * mailbox property interface.
 *
 * The buffer header and the ending tag are added by this function and
 * don't need to be supplied, just the actual tags for your operation.
 * See struct rpi_firmware_property_tag_header for the per-tag
 * structure.
 */
int rpi_firmware_property_list(struct rpi_firmware *fw,
			       void *data, size_t tag_size)
{
	size_t size = tag_size + 12;
	u32 *buf;
	dma_addr_t bus_addr;
	int ret;

	/* Packets are processed a dword at a time. */
	if (size & 3)
		return -EINVAL;

	buf = dma_alloc_coherent(fw->cl.dev, PAGE_ALIGN(size), &bus_addr,
				 GFP_ATOMIC);
	if (!buf)
		return -ENOMEM;

	/* The firmware will error out without parsing in this case. */
	WARN_ON(size >= 1024 * 1024);

	buf[0] = size;
	buf[1] = RPI_FIRMWARE_STATUS_REQUEST;
	memcpy(&buf[2], data, tag_size);
	buf[size / 4 - 1] = RPI_FIRMWARE_PROPERTY_END;
	wmb();

	ret = rpi_firmware_transaction(fw, MBOX_CHAN_PROPERTY, bus_addr);

	rmb();
	memcpy(data, &buf[2], tag_size);
	if (ret == 0 && buf[1] != RPI_FIRMWARE_STATUS_SUCCESS) {
		/*
		 * The tag name here might not be the one causing the
		 * error, if there were multiple tags in the request.
		 * But single-tag is the most common, so go with it.
		 */
		dev_err(fw->cl.dev, "Request 0x%08x returned status 0x%08x\n",
			buf[2], buf[1]);
		ret = -EINVAL;
	}

	dma_free_coherent(fw->cl.dev, PAGE_ALIGN(size), buf, bus_addr);

	return ret;
}
EXPORT_SYMBOL_GPL(rpi_firmware_property_list);

/**
 * rpi_firmware_property - Submit single firmware property
 * @fw:		Pointer to firmware structure from rpi_firmware_get().
 * @tag:	One of enum_mbox_property_tag.
 * @tag_data:	Tag data buffer.
 * @buf_size:	Buffer size.
 *
 * Submits a single tag to the VPU firmware through the mailbox
 * property interface.
 *
 * This is a convenience wrapper around
 * rpi_firmware_property_list() to avoid some of the
 * boilerplate in property calls.
 */
int rpi_firmware_property(struct rpi_firmware *fw,
			  u32 tag, void *tag_data, size_t buf_size)
{
	struct rpi_firmware_property_tag_header *header;
	int ret;

	/* Some mailboxes can use over 1k bytes. Rather than checking
	 * size and using stack or kmalloc depending on requirements,
	 * just use kmalloc. Mailboxes don't get called enough to worry
	 * too much about the time taken in the allocation.
	 */
	void *data = kmalloc(sizeof(*header) + buf_size, GFP_KERNEL);

	if (!data)
		return -ENOMEM;

	header = data;
	header->tag = tag;
	header->buf_size = buf_size;
	header->req_resp_size = 0;
	memcpy(data + sizeof(*header), tag_data, buf_size);

	ret = rpi_firmware_property_list(fw, data, buf_size + sizeof(*header));

	memcpy(tag_data, data + sizeof(*header), buf_size);

	kfree(data);

	return ret;
}
EXPORT_SYMBOL_GPL(rpi_firmware_property);

static void
rpi_firmware_print_firmware_revision(struct rpi_firmware *fw)
{
	u32 packet;
	int ret = rpi_firmware_property(fw,
					RPI_FIRMWARE_GET_FIRMWARE_REVISION,
					&packet, sizeof(packet));

	if (ret)
		return;

	dev_info(fw->cl.dev, "Attached to firmware from %ptT\n", &packet);
}

static void
rpi_register_hwmon_driver(struct device *dev, struct rpi_firmware *fw)
{
	u32 packet;
	int ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_THROTTLED,
					&packet, sizeof(packet));

	if (ret)
		return;

	rpi_hwmon = platform_device_register_data(dev, "raspberrypi-hwmon",
						  -1, NULL, 0);
}

static void rpi_register_clk_driver(struct device *dev)
{
	rpi_clk = platform_device_register_data(dev, "raspberrypi-clk",
						-1, NULL, 0);
}

static int rpi_firmware_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct rpi_firmware *fw;

	fw = devm_kzalloc(dev, sizeof(*fw), GFP_KERNEL);
	if (!fw)
		return -ENOMEM;

	fw->cl.dev = dev;
	fw->cl.rx_callback = response_callback;
	fw->cl.tx_block = true;

	fw->chan = mbox_request_channel(&fw->cl, 0);
	if (IS_ERR(fw->chan)) {
		int ret = PTR_ERR(fw->chan);
		if (ret != -EPROBE_DEFER)
			dev_err(dev, "Failed to get mbox channel: %d\n", ret);
		return ret;
	}

	init_completion(&fw->c);

	platform_set_drvdata(pdev, fw);

	rpi_firmware_print_firmware_revision(fw);
	rpi_register_hwmon_driver(dev, fw);
	rpi_register_clk_driver(dev);

	return 0;
}

static void rpi_firmware_shutdown(struct platform_device *pdev)
{
	struct rpi_firmware *fw = platform_get_drvdata(pdev);

	if (!fw)
		return;

	rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_REBOOT, NULL, 0);
}

static int rpi_firmware_remove(struct platform_device *pdev)
{
	struct rpi_firmware *fw = platform_get_drvdata(pdev);

	platform_device_unregister(rpi_hwmon);
	rpi_hwmon = NULL;
	platform_device_unregister(rpi_clk);
	rpi_clk = NULL;
	mbox_free_channel(fw->chan);

	return 0;
}

/**
 * rpi_firmware_get - Get pointer to rpi_firmware structure.
 * @firmware_node:    Pointer to the firmware Device Tree node.
 *
 * Returns NULL is the firmware device is not ready.
 */
struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node)
{
	struct platform_device *pdev = of_find_device_by_node(firmware_node);

	if (!pdev)
		return NULL;

	return platform_get_drvdata(pdev);
}
EXPORT_SYMBOL_GPL(rpi_firmware_get);

/*
 * The Raspberry Pi 4 gets its USB functionality from VL805, a PCIe chip that
 * implements xHCI. After a PCI reset, VL805's firmware may either be loaded
 * directly from an EEPROM or, if not present, by the SoC's co-processor,
 * VideoCore. RPi4's VideoCore OS contains both the non public firmware load
 * logic and the VL805 firmware blob. This function triggers the aforementioned
 * process.
 */
int rpi_firmware_init_vl805(struct pci_dev *pdev)
{
	struct device_node *fw_np;
	struct rpi_firmware *fw;
	u32 dev_addr, version;
	int ret;

	fw_np = of_find_compatible_node(NULL, NULL,
					"raspberrypi,bcm2835-firmware");
	if (!fw_np)
		return 0;

	fw = rpi_firmware_get(fw_np);
	of_node_put(fw_np);
	if (!fw)
		return -ENODEV;

	/*
	 * Make sure we don't trigger a firmware load unnecessarily.
	 *
	 * If something went wrong with PCI, this whole exercise would be
	 * futile as VideoCore expects from us a configured PCI bus. Just take
	 * the faulty version (likely ~0) and let xHCI's registration fail
	 * further down the line.
	 */
	pci_read_config_dword(pdev, VL805_PCI_CONFIG_VERSION_OFFSET, &version);
	if (version)
		goto exit;

	dev_addr = pdev->bus->number << 20 | PCI_SLOT(pdev->devfn) << 15 |
		   PCI_FUNC(pdev->devfn) << 12;

	ret = rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_XHCI_RESET,
				    &dev_addr, sizeof(dev_addr));
	if (ret)
		return ret;

	/* Wait for vl805 to startup */
	usleep_range(200, 1000);

	pci_read_config_dword(pdev, VL805_PCI_CONFIG_VERSION_OFFSET,
			      &version);
exit:
	pci_info(pdev, "VL805 firmware version %08x\n", version);

	return 0;
}
EXPORT_SYMBOL_GPL(rpi_firmware_init_vl805);

static const struct of_device_id rpi_firmware_of_match[] = {
	{ .compatible = "raspberrypi,bcm2835-firmware", },
	{},
};
MODULE_DEVICE_TABLE(of, rpi_firmware_of_match);

static struct platform_driver rpi_firmware_driver = {
	.driver = {
		.name = "raspberrypi-firmware",
		.of_match_table = rpi_firmware_of_match,
	},
	.probe		= rpi_firmware_probe,
	.shutdown	= rpi_firmware_shutdown,
	.remove		= rpi_firmware_remove,
};
module_platform_driver(rpi_firmware_driver);

MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
MODULE_DESCRIPTION("Raspberry Pi firmware driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
502b431c	1	// SPDX-License-Identifier: GPL-2.0
4e3d6065 EA	2	/*
	3	* Defines interfaces for interacting wtih the Raspberry Pi firmware's
	4	* property channel.
	5	*
	6	* Copyright © 2015 Broadcom
4e3d6065 EA	7	*/
	8
	9	#include <linux/dma-mapping.h>
	10	#include <linux/mailbox_client.h>
	11	#include <linux/module.h>
	12	#include <linux/of_platform.h>
	13	#include <linux/platform_device.h>
91c6ada6	14	#include <linux/slab.h>
fbbc5ff3 NSJ	15	#include <linux/pci.h>
fbbc5ff3 NSJ	16	#include <linux/delay.h>
4e3d6065 EA	17	#include <soc/bcm2835/raspberrypi-firmware.h>
	18
	19	#define MBOX_MSG(chan, data28) (((data28) & ~0xf) \| ((chan) & 0xf))
	20	#define MBOX_CHAN(msg) ((msg) & 0xf)
	21	#define MBOX_DATA28(msg) ((msg) & ~0xf)
	22	#define MBOX_CHAN_PROPERTY 8
	23
fbbc5ff3 NSJ	24	#define VL805_PCI_CONFIG_VERSION_OFFSET 0x50
fbbc5ff3 NSJ	25
70eea1bb	26	static struct platform_device *rpi_hwmon;
91f2cf4a	27	static struct platform_device *rpi_clk;
70eea1bb	28
4e3d6065 EA	29	struct rpi_firmware {
	30	struct mbox_client cl;
	31	struct mbox_chan chan; / The property channel. */
	32	struct completion c;
	33	u32 enabled;
	34	};
	35
	36	static DEFINE_MUTEX(transaction_lock);
	37
	38	static void response_callback(struct mbox_client cl, void msg)
	39	{
	40	struct rpi_firmware *fw = container_of(cl, struct rpi_firmware, cl);
	41	complete(&fw->c);
	42	}
	43
	44	/*
	45	* Sends a request to the firmware through the BCM2835 mailbox driver,
	46	* and synchronously waits for the reply.
	47	*/
	48	static int
	49	rpi_firmware_transaction(struct rpi_firmware *fw, u32 chan, u32 data)
	50	{
	51	u32 message = MBOX_MSG(chan, data);
	52	int ret;
	53
	54	WARN_ON(data & 0xf);
	55
	56	mutex_lock(&transaction_lock);
	57	reinit_completion(&fw->c);
	58	ret = mbox_send_message(fw->chan, &message);
	59	if (ret >= 0) {
0829187b SW	60	if (wait_for_completion_timeout(&fw->c, HZ)) {
	61	ret = 0;
	62	} else {
	63	ret = -ETIMEDOUT;
	64	WARN_ONCE(1, "Firmware transaction timeout");
	65	}
4e3d6065 EA	66	} else {
	67	dev_err(fw->cl.dev, "mbox_send_message returned %d\n", ret);
	68	}
	69	mutex_unlock(&transaction_lock);
	70
	71	return ret;
	72	}
	73
	74	/**
	75	* rpi_firmware_property_list - Submit firmware property list
	76	* @fw: Pointer to firmware structure from rpi_firmware_get().
	77	* @data: Buffer holding tags.
	78	* @tag_size: Size of tags buffer.
	79	*
	80	* Submits a set of concatenated tags to the VPU firmware through the
	81	* mailbox property interface.
	82	*
	83	* The buffer header and the ending tag are added by this function and
	84	* don't need to be supplied, just the actual tags for your operation.
	85	* See struct rpi_firmware_property_tag_header for the per-tag
	86	* structure.
	87	*/
	88	int rpi_firmware_property_list(struct rpi_firmware *fw,
	89	void *data, size_t tag_size)
	90	{
	91	size_t size = tag_size + 12;
	92	u32 *buf;
	93	dma_addr_t bus_addr;
	94	int ret;
	95
	96	/* Packets are processed a dword at a time. */
	97	if (size & 3)
	98	return -EINVAL;
	99
	100	buf = dma_alloc_coherent(fw->cl.dev, PAGE_ALIGN(size), &bus_addr,
	101	GFP_ATOMIC);
	102	if (!buf)
	103	return -ENOMEM;
	104
	105	/* The firmware will error out without parsing in this case. */
	106	WARN_ON(size >= 1024 * 1024);
	107
	108	buf[0] = size;
	109	buf[1] = RPI_FIRMWARE_STATUS_REQUEST;
	110	memcpy(&buf[2], data, tag_size);
	111	buf[size / 4 - 1] = RPI_FIRMWARE_PROPERTY_END;
	112	wmb();
	113
	114	ret = rpi_firmware_transaction(fw, MBOX_CHAN_PROPERTY, bus_addr);
	115
	116	rmb();
	117	memcpy(data, &buf[2], tag_size);
	118	if (ret == 0 && buf[1] != RPI_FIRMWARE_STATUS_SUCCESS) {
	119	/*
	120	* The tag name here might not be the one causing the
	121	* error, if there were multiple tags in the request.
	122	* But single-tag is the most common, so go with it.
	123	*/
	124	dev_err(fw->cl.dev, "Request 0x%08x returned status 0x%08x\n",
	125	buf[2], buf[1]);
	126	ret = -EINVAL;
	127	}
	128
	129	dma_free_coherent(fw->cl.dev, PAGE_ALIGN(size), buf, bus_addr);
130
131	return ret;
132	}
133	EXPORT_SYMBOL_GPL(rpi_firmware_property_list);
134
135	/**
136	* rpi_firmware_property - Submit single firmware property
137	* @fw: Pointer to firmware structure from rpi_firmware_get().
138	* @tag: One of enum_mbox_property_tag.
139	* @tag_data: Tag data buffer.
140	* @buf_size: Buffer size.
141	*
142	* Submits a single tag to the VPU firmware through the mailbox
143	* property interface.
144	*
145	* This is a convenience wrapper around
146	* rpi_firmware_property_list() to avoid some of the
147	* boilerplate in property calls.
148	*/
149	int rpi_firmware_property(struct rpi_firmware *fw,
150	u32 tag, void *tag_data, size_t buf_size)
151	{
91c6ada6	152	struct rpi_firmware_property_tag_header *header;
4e3d6065 EA	153	int ret;
4e3d6065 EA	154
91c6ada6 JH	155	/* Some mailboxes can use over 1k bytes. Rather than checking
	156	* size and using stack or kmalloc depending on requirements,
	157	* just use kmalloc. Mailboxes don't get called enough to worry
	158	* too much about the time taken in the allocation.
	159	*/
	160	void data = kmalloc(sizeof(header) + buf_size, GFP_KERNEL);
a1547e0b	161
91c6ada6 JH	162	if (!data)
	163	return -ENOMEM;
	164
	165	header = data;
4e3d6065 EA	166	header->tag = tag;
	167	header->buf_size = buf_size;
	168	header->req_resp_size = 0;
91c6ada6 JH	169	memcpy(data + sizeof(*header), tag_data, buf_size);
	170
	171	ret = rpi_firmware_property_list(fw, data, buf_size + sizeof(*header));
	172
	173	memcpy(tag_data, data + sizeof(*header), buf_size);
4e3d6065	174
91c6ada6	175	kfree(data);
4e3d6065 EA	176
	177	return ret;
	178	}
	179	EXPORT_SYMBOL_GPL(rpi_firmware_property);
	180
	181	static void
	182	rpi_firmware_print_firmware_revision(struct rpi_firmware *fw)
	183	{
	184	u32 packet;
	185	int ret = rpi_firmware_property(fw,
	186	RPI_FIRMWARE_GET_FIRMWARE_REVISION,
	187	&packet, sizeof(packet));
	188
4a60f58e AS	189	if (ret)
4a60f58e AS	190	return;
4e3d6065	191
4a60f58e	192	dev_info(fw->cl.dev, "Attached to firmware from %ptT\n", &packet);
4e3d6065 EA	193	}
4e3d6065 EA	194
70eea1bb SW	195	static void
	196	rpi_register_hwmon_driver(struct device dev, struct rpi_firmware fw)
	197	{
	198	u32 packet;
	199	int ret = rpi_firmware_property(fw, RPI_FIRMWARE_GET_THROTTLED,
	200	&packet, sizeof(packet));
	201
	202	if (ret)
	203	return;
	204
	205	rpi_hwmon = platform_device_register_data(dev, "raspberrypi-hwmon",
	206	-1, NULL, 0);
	207	}
	208
91f2cf4a NSJ	209	static void rpi_register_clk_driver(struct device *dev)
	210	{
	211	rpi_clk = platform_device_register_data(dev, "raspberrypi-clk",
	212	-1, NULL, 0);
	213	}
	214
4e3d6065 EA	215	static int rpi_firmware_probe(struct platform_device *pdev)
	216	{
	217	struct device *dev = &pdev->dev;
	218	struct rpi_firmware *fw;
	219
	220	fw = devm_kzalloc(dev, sizeof(*fw), GFP_KERNEL);
	221	if (!fw)
	222	return -ENOMEM;
	223
	224	fw->cl.dev = dev;
	225	fw->cl.rx_callback = response_callback;
	226	fw->cl.tx_block = true;
	227
	228	fw->chan = mbox_request_channel(&fw->cl, 0);
	229	if (IS_ERR(fw->chan)) {
	230	int ret = PTR_ERR(fw->chan);
	231	if (ret != -EPROBE_DEFER)
	232	dev_err(dev, "Failed to get mbox channel: %d\n", ret);
	233	return ret;
	234	}
	235
	236	init_completion(&fw->c);
	237
	238	platform_set_drvdata(pdev, fw);
	239
	240	rpi_firmware_print_firmware_revision(fw);
70eea1bb	241	rpi_register_hwmon_driver(dev, fw);
91f2cf4a	242	rpi_register_clk_driver(dev);
4e3d6065 EA	243
	244	return 0;
	245	}
	246
b80ec7c0 SW	247	static void rpi_firmware_shutdown(struct platform_device *pdev)
	248	{
	249	struct rpi_firmware *fw = platform_get_drvdata(pdev);
	250
	251	if (!fw)
	252	return;
	253
	254	rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_REBOOT, NULL, 0);
	255	}
	256
4e3d6065 EA	257	static int rpi_firmware_remove(struct platform_device *pdev)
	258	{
	259	struct rpi_firmware *fw = platform_get_drvdata(pdev);
	260
70eea1bb SW	261	platform_device_unregister(rpi_hwmon);
70eea1bb SW	262	rpi_hwmon = NULL;
91f2cf4a NSJ	263	platform_device_unregister(rpi_clk);
91f2cf4a NSJ	264	rpi_clk = NULL;
4e3d6065 EA	265	mbox_free_channel(fw->chan);
	266
	267	return 0;
	268	}
	269
	270	/**
	271	* rpi_firmware_get - Get pointer to rpi_firmware structure.
	272	* @firmware_node: Pointer to the firmware Device Tree node.
	273	*
	274	* Returns NULL is the firmware device is not ready.
	275	*/
	276	struct rpi_firmware rpi_firmware_get(struct device_node firmware_node)
	277	{
	278	struct platform_device *pdev = of_find_device_by_node(firmware_node);
	279
	280	if (!pdev)
	281	return NULL;
	282
	283	return platform_get_drvdata(pdev);
	284	}
	285	EXPORT_SYMBOL_GPL(rpi_firmware_get);
	286
fbbc5ff3 NSJ	287	/*
	288	* The Raspberry Pi 4 gets its USB functionality from VL805, a PCIe chip that
	289	* implements xHCI. After a PCI reset, VL805's firmware may either be loaded
	290	* directly from an EEPROM or, if not present, by the SoC's co-processor,
	291	* VideoCore. RPi4's VideoCore OS contains both the non public firmware load
	292	* logic and the VL805 firmware blob. This function triggers the aforementioned
	293	* process.
	294	*/
	295	int rpi_firmware_init_vl805(struct pci_dev *pdev)
	296	{
	297	struct device_node *fw_np;
	298	struct rpi_firmware *fw;
	299	u32 dev_addr, version;
	300	int ret;
	301
	302	fw_np = of_find_compatible_node(NULL, NULL,
	303	"raspberrypi,bcm2835-firmware");
	304	if (!fw_np)
	305	return 0;
	306
	307	fw = rpi_firmware_get(fw_np);
	308	of_node_put(fw_np);
	309	if (!fw)
	310	return -ENODEV;
	311
	312	/*
	313	* Make sure we don't trigger a firmware load unnecessarily.
	314	*
	315	* If something went wrong with PCI, this whole exercise would be
	316	* futile as VideoCore expects from us a configured PCI bus. Just take
	317	* the faulty version (likely ~0) and let xHCI's registration fail
	318	* further down the line.
	319	*/
	320	pci_read_config_dword(pdev, VL805_PCI_CONFIG_VERSION_OFFSET, &version);
	321	if (version)
	322	goto exit;
	323
	324	dev_addr = pdev->bus->number << 20 \| PCI_SLOT(pdev->devfn) << 15 \|
	325	PCI_FUNC(pdev->devfn) << 12;
	326
	327	ret = rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_XHCI_RESET,
	328	&dev_addr, sizeof(dev_addr));
	329	if (ret)
	330	return ret;
	331
	332	/* Wait for vl805 to startup */
	333	usleep_range(200, 1000);
	334
	335	pci_read_config_dword(pdev, VL805_PCI_CONFIG_VERSION_OFFSET,
	336	&version);
	337	exit:
	338	pci_info(pdev, "VL805 firmware version %08x\n", version);
	339
	340	return 0;
	341	}
	342	EXPORT_SYMBOL_GPL(rpi_firmware_init_vl805);
	343
4e3d6065 EA	344	static const struct of_device_id rpi_firmware_of_match[] = {
	345	{ .compatible = "raspberrypi,bcm2835-firmware", },
	346	{},
	347	};
	348	MODULE_DEVICE_TABLE(of, rpi_firmware_of_match);
	349
	350	static struct platform_driver rpi_firmware_driver = {
	351	.driver = {
	352	.name = "raspberrypi-firmware",
	353	.of_match_table = rpi_firmware_of_match,
	354	},
	355	.probe = rpi_firmware_probe,
b80ec7c0	356	.shutdown = rpi_firmware_shutdown,
4e3d6065 EA	357	.remove = rpi_firmware_remove,
	358	};
	359	module_platform_driver(rpi_firmware_driver);
	360
	361	MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
	362	MODULE_DESCRIPTION("Raspberry Pi firmware driver");
	363	MODULE_LICENSE("GPL v2");