[linux-2.6-block.git] / drivers / mailbox / mailbox-test.c

/*
 * Copyright (C) 2015 ST Microelectronics
 *
 * Author: Lee Jones <lee.jones@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/debugfs.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

#define MBOX_MAX_SIG_LEN	8
#define MBOX_MAX_MSG_LEN	128
#define MBOX_BYTES_PER_LINE	16
#define MBOX_HEXDUMP_LINE_LEN	((MBOX_BYTES_PER_LINE * 4) + 2)
#define MBOX_HEXDUMP_MAX_LEN	(MBOX_HEXDUMP_LINE_LEN *		\
				 (MBOX_MAX_MSG_LEN / MBOX_BYTES_PER_LINE))

static struct dentry *root_debugfs_dir;

struct mbox_test_device {
	struct device		*dev;
	void __iomem		*tx_mmio;
	void __iomem		*rx_mmio;
	struct mbox_chan	*tx_channel;
	struct mbox_chan	*rx_channel;
	char			*rx_buffer;
	char			*signal;
	char			*message;
	spinlock_t		lock;
};

static ssize_t mbox_test_signal_write(struct file *filp,
				       const char __user *userbuf,
				       size_t count, loff_t *ppos)
{
	struct mbox_test_device *tdev = filp->private_data;
	int ret;

	if (!tdev->tx_channel) {
		dev_err(tdev->dev, "Channel cannot do Tx\n");
		return -EINVAL;
	}

	if (count > MBOX_MAX_SIG_LEN) {
		dev_err(tdev->dev,
			"Signal length %zd greater than max allowed %d\n",
			count, MBOX_MAX_SIG_LEN);
		return -EINVAL;
	}

	tdev->signal = kzalloc(MBOX_MAX_SIG_LEN, GFP_KERNEL);
	if (!tdev->signal)
		return -ENOMEM;

	ret = copy_from_user(tdev->signal, userbuf, count);
	if (ret) {
		kfree(tdev->signal);
		return -EFAULT;
	}

	return ret < 0 ? ret : count;
}

static const struct file_operations mbox_test_signal_ops = {
	.write	= mbox_test_signal_write,
	.open	= simple_open,
	.llseek	= generic_file_llseek,
};

static ssize_t mbox_test_message_write(struct file *filp,
				       const char __user *userbuf,
				       size_t count, loff_t *ppos)
{
	struct mbox_test_device *tdev = filp->private_data;
	void *data;
	int ret;

	if (!tdev->tx_channel) {
		dev_err(tdev->dev, "Channel cannot do Tx\n");
		return -EINVAL;
	}

	if (count > MBOX_MAX_MSG_LEN) {
		dev_err(tdev->dev,
			"Message length %zd greater than max allowed %d\n",
			count, MBOX_MAX_MSG_LEN);
		return -EINVAL;
	}

	tdev->message = kzalloc(MBOX_MAX_MSG_LEN, GFP_KERNEL);
	if (!tdev->message)
		return -ENOMEM;

	ret = copy_from_user(tdev->message, userbuf, count);
	if (ret) {
		ret = -EFAULT;
		goto out;
	}

	/*
	 * A separate signal is only of use if there is
	 * MMIO to subsequently pass the message through
	 */
	if (tdev->tx_mmio && tdev->signal) {
		print_hex_dump_bytes("Client: Sending: Signal: ", DUMP_PREFIX_ADDRESS,
				     tdev->signal, MBOX_MAX_SIG_LEN);

		data = tdev->signal;
	} else
		data = tdev->message;

	print_hex_dump_bytes("Client: Sending: Message: ", DUMP_PREFIX_ADDRESS,
			     tdev->message, MBOX_MAX_MSG_LEN);

	ret = mbox_send_message(tdev->tx_channel, data);
	if (ret < 0)
		dev_err(tdev->dev, "Failed to send message via mailbox\n");

out:
	kfree(tdev->signal);
	kfree(tdev->message);

	return ret < 0 ? ret : count;
}

static ssize_t mbox_test_message_read(struct file *filp, char __user *userbuf,
				      size_t count, loff_t *ppos)
{
	struct mbox_test_device *tdev = filp->private_data;
	unsigned long flags;
	char *touser, *ptr;
	int l = 0;
	int ret;

	touser = kzalloc(MBOX_HEXDUMP_MAX_LEN + 1, GFP_KERNEL);
	if (!touser)
		return -ENOMEM;

	if (!tdev->rx_channel) {
		ret = snprintf(touser, 20, "<NO RX CAPABILITY>\n");
		ret = simple_read_from_buffer(userbuf, count, ppos,
					      touser, ret);
		goto out;
	}

	if (tdev->rx_buffer[0] == '\0') {
		ret = snprintf(touser, 9, "<EMPTY>\n");
		ret = simple_read_from_buffer(userbuf, count, ppos,
					      touser, ret);
		goto out;
	}

	spin_lock_irqsave(&tdev->lock, flags);

	ptr = tdev->rx_buffer;
	while (l < MBOX_HEXDUMP_MAX_LEN) {
		hex_dump_to_buffer(ptr,
				   MBOX_BYTES_PER_LINE,
				   MBOX_BYTES_PER_LINE, 1, touser + l,
				   MBOX_HEXDUMP_LINE_LEN, true);

		ptr += MBOX_BYTES_PER_LINE;
		l += MBOX_HEXDUMP_LINE_LEN;
		*(touser + (l - 1)) = '\n';
	}
	*(touser + l) = '\0';

	memset(tdev->rx_buffer, 0, MBOX_MAX_MSG_LEN);

	spin_unlock_irqrestore(&tdev->lock, flags);

	ret = simple_read_from_buffer(userbuf, count, ppos, touser, MBOX_HEXDUMP_MAX_LEN);
out:
	kfree(touser);
	return ret;
}

static const struct file_operations mbox_test_message_ops = {
	.write	= mbox_test_message_write,
	.read	= mbox_test_message_read,
	.open	= simple_open,
	.llseek	= generic_file_llseek,
};

static int mbox_test_add_debugfs(struct platform_device *pdev,
				 struct mbox_test_device *tdev)
{
	if (!debugfs_initialized())
		return 0;

	root_debugfs_dir = debugfs_create_dir("mailbox", NULL);
	if (!root_debugfs_dir) {
		dev_err(&pdev->dev, "Failed to create Mailbox debugfs\n");
		return -EINVAL;
	}

	debugfs_create_file("message", 0600, root_debugfs_dir,
			    tdev, &mbox_test_message_ops);

	debugfs_create_file("signal", 0200, root_debugfs_dir,
			    tdev, &mbox_test_signal_ops);

	return 0;
}

static void mbox_test_receive_message(struct mbox_client *client, void *message)
{
	struct mbox_test_device *tdev = dev_get_drvdata(client->dev);
	unsigned long flags;

	spin_lock_irqsave(&tdev->lock, flags);
	if (tdev->rx_mmio) {
		memcpy_fromio(tdev->rx_buffer, tdev->rx_mmio, MBOX_MAX_MSG_LEN);
		print_hex_dump_bytes("Client: Received [MMIO]: ", DUMP_PREFIX_ADDRESS,
				     tdev->rx_buffer, MBOX_MAX_MSG_LEN);
	} else if (message) {
		print_hex_dump_bytes("Client: Received [API]: ", DUMP_PREFIX_ADDRESS,
				     message, MBOX_MAX_MSG_LEN);
		memcpy(tdev->rx_buffer, message, MBOX_MAX_MSG_LEN);
	}
	spin_unlock_irqrestore(&tdev->lock, flags);
}

static void mbox_test_prepare_message(struct mbox_client *client, void *message)
{
	struct mbox_test_device *tdev = dev_get_drvdata(client->dev);

	if (tdev->tx_mmio) {
		if (tdev->signal)
			memcpy_toio(tdev->tx_mmio, tdev->message, MBOX_MAX_MSG_LEN);
		else
			memcpy_toio(tdev->tx_mmio, message, MBOX_MAX_MSG_LEN);
	}
}

static void mbox_test_message_sent(struct mbox_client *client,
				   void *message, int r)
{
	if (r)
		dev_warn(client->dev,
			 "Client: Message could not be sent: %d\n", r);
	else
		dev_info(client->dev,
			 "Client: Message sent\n");
}

static struct mbox_chan *
mbox_test_request_channel(struct platform_device *pdev, const char *name)
{
	struct mbox_client *client;
	struct mbox_chan *channel;

	client = devm_kzalloc(&pdev->dev, sizeof(*client), GFP_KERNEL);
	if (!client)
		return ERR_PTR(-ENOMEM);

	client->dev		= &pdev->dev;
	client->rx_callback	= mbox_test_receive_message;
	client->tx_prepare	= mbox_test_prepare_message;
	client->tx_done		= mbox_test_message_sent;
	client->tx_block	= true;
	client->knows_txdone	= false;
	client->tx_tout		= 500;

	channel = mbox_request_channel_byname(client, name);
	if (IS_ERR(channel)) {
		dev_warn(&pdev->dev, "Failed to request %s channel\n", name);
		return NULL;
	}

	return channel;
}

static int mbox_test_probe(struct platform_device *pdev)
{
	struct mbox_test_device *tdev;
	struct resource *res;
	int ret;

	tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL);
	if (!tdev)
		return -ENOMEM;

	/* It's okay for MMIO to be NULL */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	tdev->tx_mmio = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(tdev->tx_mmio))
		tdev->tx_mmio = NULL;

	/* If specified, second reg entry is Rx MMIO */
	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	tdev->rx_mmio = devm_ioremap_resource(&pdev->dev, res);
	if (IS_ERR(tdev->rx_mmio))
		tdev->rx_mmio = tdev->tx_mmio;

	tdev->tx_channel = mbox_test_request_channel(pdev, "tx");
	tdev->rx_channel = mbox_test_request_channel(pdev, "rx");

	if (!tdev->tx_channel && !tdev->rx_channel)
		return -EPROBE_DEFER;

	/* If Rx is not specified but has Rx MMIO, then Rx = Tx */
	if (!tdev->rx_channel && (tdev->rx_mmio != tdev->tx_mmio))
		tdev->rx_channel = tdev->tx_channel;

	tdev->dev = &pdev->dev;
	platform_set_drvdata(pdev, tdev);

	spin_lock_init(&tdev->lock);

	if (tdev->rx_channel) {
		tdev->rx_buffer = devm_kzalloc(&pdev->dev,
					       MBOX_MAX_MSG_LEN, GFP_KERNEL);
		if (!tdev->rx_buffer)
			return -ENOMEM;
	}

	ret = mbox_test_add_debugfs(pdev, tdev);
	if (ret)
		return ret;

	dev_info(&pdev->dev, "Successfully registered\n");

	return 0;
}

static int mbox_test_remove(struct platform_device *pdev)
{
	struct mbox_test_device *tdev = platform_get_drvdata(pdev);

	debugfs_remove_recursive(root_debugfs_dir);

	if (tdev->tx_channel)
		mbox_free_channel(tdev->tx_channel);
	if (tdev->rx_channel)
		mbox_free_channel(tdev->rx_channel);

	return 0;
}

static const struct of_device_id mbox_test_match[] = {
	{ .compatible = "mailbox-test" },
	{},
};

static struct platform_driver mbox_test_driver = {
	.driver = {
		.name = "mailbox_test",
		.of_match_table = mbox_test_match,
	},
	.probe  = mbox_test_probe,
	.remove = mbox_test_remove,
};
module_platform_driver(mbox_test_driver);

MODULE_DESCRIPTION("Generic Mailbox Testing Facility");
MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
8ea4484d LJ	1	/*
	2	* Copyright (C) 2015 ST Microelectronics
	3	*
	4	* Author: Lee Jones <lee.jones@linaro.org>
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*/
	11
	12	#include <linux/debugfs.h>
	13	#include <linux/err.h>
a133f8b6	14	#include <linux/io.h>
8ea4484d LJ	15	#include <linux/kernel.h>
	16	#include <linux/mailbox_client.h>
	17	#include <linux/module.h>
	18	#include <linux/of.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/slab.h>
	21	#include <linux/uaccess.h>
	22
	23	#define MBOX_MAX_SIG_LEN 8
	24	#define MBOX_MAX_MSG_LEN 128
	25	#define MBOX_BYTES_PER_LINE 16
6c03663f	26	#define MBOX_HEXDUMP_LINE_LEN ((MBOX_BYTES_PER_LINE * 4) + 2)
8ea4484d LJ	27	#define MBOX_HEXDUMP_MAX_LEN (MBOX_HEXDUMP_LINE_LEN * \
	28	(MBOX_MAX_MSG_LEN / MBOX_BYTES_PER_LINE))
	29
	30	static struct dentry *root_debugfs_dir;
	31
	32	struct mbox_test_device {
	33	struct device *dev;
2d74ffdc SH	34	void __iomem *tx_mmio;
2d74ffdc SH	35	void __iomem *rx_mmio;
8ea4484d LJ	36	struct mbox_chan *tx_channel;
	37	struct mbox_chan *rx_channel;
	38	char *rx_buffer;
	39	char *signal;
	40	char *message;
	41	spinlock_t lock;
	42	};
	43
	44	static ssize_t mbox_test_signal_write(struct file *filp,
	45	const char __user *userbuf,
	46	size_t count, loff_t *ppos)
	47	{
	48	struct mbox_test_device *tdev = filp->private_data;
	49	int ret;
	50
	51	if (!tdev->tx_channel) {
	52	dev_err(tdev->dev, "Channel cannot do Tx\n");
	53	return -EINVAL;
	54	}
	55
	56	if (count > MBOX_MAX_SIG_LEN) {
	57	dev_err(tdev->dev,
6c03663f	58	"Signal length %zd greater than max allowed %d\n",
8ea4484d LJ	59	count, MBOX_MAX_SIG_LEN);
	60	return -EINVAL;
	61	}
	62
	63	tdev->signal = kzalloc(MBOX_MAX_SIG_LEN, GFP_KERNEL);
	64	if (!tdev->signal)
	65	return -ENOMEM;
	66
	67	ret = copy_from_user(tdev->signal, userbuf, count);
	68	if (ret) {
	69	kfree(tdev->signal);
	70	return -EFAULT;
	71	}
	72
	73	return ret < 0 ? ret : count;
	74	}
	75
	76	static const struct file_operations mbox_test_signal_ops = {
	77	.write = mbox_test_signal_write,
	78	.open = simple_open,
	79	.llseek = generic_file_llseek,
	80	};
	81
	82	static ssize_t mbox_test_message_write(struct file *filp,
	83	const char __user *userbuf,
	84	size_t count, loff_t *ppos)
	85	{
	86	struct mbox_test_device *tdev = filp->private_data;
	87	void *data;
	88	int ret;
	89
	90	if (!tdev->tx_channel) {
	91	dev_err(tdev->dev, "Channel cannot do Tx\n");
	92	return -EINVAL;
	93	}
	94
	95	if (count > MBOX_MAX_MSG_LEN) {
	96	dev_err(tdev->dev,
6c03663f	97	"Message length %zd greater than max allowed %d\n",
8ea4484d LJ	98	count, MBOX_MAX_MSG_LEN);
	99	return -EINVAL;
	100	}
	101
	102	tdev->message = kzalloc(MBOX_MAX_MSG_LEN, GFP_KERNEL);
	103	if (!tdev->message)
	104	return -ENOMEM;
	105
	106	ret = copy_from_user(tdev->message, userbuf, count);
	107	if (ret) {
	108	ret = -EFAULT;
	109	goto out;
	110	}
	111
	112	/*
	113	* A separate signal is only of use if there is
	114	* MMIO to subsequently pass the message through
	115	*/
2d74ffdc	116	if (tdev->tx_mmio && tdev->signal) {
27fa680f SH	117	print_hex_dump_bytes("Client: Sending: Signal: ", DUMP_PREFIX_ADDRESS,
27fa680f SH	118	tdev->signal, MBOX_MAX_SIG_LEN);
8ea4484d LJ	119
	120	data = tdev->signal;
	121	} else
	122	data = tdev->message;
	123
27fa680f SH	124	print_hex_dump_bytes("Client: Sending: Message: ", DUMP_PREFIX_ADDRESS,
27fa680f SH	125	tdev->message, MBOX_MAX_MSG_LEN);
8ea4484d LJ	126
	127	ret = mbox_send_message(tdev->tx_channel, data);
	128	if (ret < 0)
	129	dev_err(tdev->dev, "Failed to send message via mailbox\n");
	130
	131	out:
	132	kfree(tdev->signal);
	133	kfree(tdev->message);
	134
	135	return ret < 0 ? ret : count;
	136	}
	137
	138	static ssize_t mbox_test_message_read(struct file filp, char __user userbuf,
	139	size_t count, loff_t *ppos)
	140	{
	141	struct mbox_test_device *tdev = filp->private_data;
	142	unsigned long flags;
	143	char touser, ptr;
	144	int l = 0;
	145	int ret;
	146
c3ac54a6	147	touser = kzalloc(MBOX_HEXDUMP_MAX_LEN + 1, GFP_KERNEL);
8ea4484d LJ	148	if (!touser)
	149	return -ENOMEM;
	150
	151	if (!tdev->rx_channel) {
	152	ret = snprintf(touser, 20, "<NO RX CAPABILITY>\n");
	153	ret = simple_read_from_buffer(userbuf, count, ppos,
	154	touser, ret);
	155	goto out;
	156	}
	157
	158	if (tdev->rx_buffer[0] == '\0') {
	159	ret = snprintf(touser, 9, "<EMPTY>\n");
	160	ret = simple_read_from_buffer(userbuf, count, ppos,
	161	touser, ret);
	162	goto out;
	163	}
	164
	165	spin_lock_irqsave(&tdev->lock, flags);
	166
	167	ptr = tdev->rx_buffer;
	168	while (l < MBOX_HEXDUMP_MAX_LEN) {
	169	hex_dump_to_buffer(ptr,
	170	MBOX_BYTES_PER_LINE,
	171	MBOX_BYTES_PER_LINE, 1, touser + l,
	172	MBOX_HEXDUMP_LINE_LEN, true);
	173
	174	ptr += MBOX_BYTES_PER_LINE;
	175	l += MBOX_HEXDUMP_LINE_LEN;
	176	*(touser + (l - 1)) = '\n';
	177	}
	178	*(touser + l) = '\0';
	179
	180	memset(tdev->rx_buffer, 0, MBOX_MAX_MSG_LEN);
	181
	182	spin_unlock_irqrestore(&tdev->lock, flags);
	183
	184	ret = simple_read_from_buffer(userbuf, count, ppos, touser, MBOX_HEXDUMP_MAX_LEN);
	185	out:
	186	kfree(touser);
	187	return ret;
	188	}
	189
	190	static const struct file_operations mbox_test_message_ops = {
	191	.write = mbox_test_message_write,
	192	.read = mbox_test_message_read,
	193	.open = simple_open,
	194	.llseek = generic_file_llseek,
	195	};
	196
	197	static int mbox_test_add_debugfs(struct platform_device *pdev,
	198	struct mbox_test_device *tdev)
	199	{
	200	if (!debugfs_initialized())
	201	return 0;
	202
	203	root_debugfs_dir = debugfs_create_dir("mailbox", NULL);
	204	if (!root_debugfs_dir) {
	205	dev_err(&pdev->dev, "Failed to create Mailbox debugfs\n");
	206	return -EINVAL;
	207	}
	208
	209	debugfs_create_file("message", 0600, root_debugfs_dir,
	210	tdev, &mbox_test_message_ops);
	211
212	debugfs_create_file("signal", 0200, root_debugfs_dir,
213	tdev, &mbox_test_signal_ops);
214
215	return 0;
216	}
217
218	static void mbox_test_receive_message(struct mbox_client client, void message)
219	{
220	struct mbox_test_device *tdev = dev_get_drvdata(client->dev);
221	unsigned long flags;
222
223	spin_lock_irqsave(&tdev->lock, flags);
2d74ffdc SH	224	if (tdev->rx_mmio) {
2d74ffdc SH	225	memcpy_fromio(tdev->rx_buffer, tdev->rx_mmio, MBOX_MAX_MSG_LEN);
27fa680f SH	226	print_hex_dump_bytes("Client: Received [MMIO]: ", DUMP_PREFIX_ADDRESS,
27fa680f SH	227	tdev->rx_buffer, MBOX_MAX_MSG_LEN);
8ea4484d	228	} else if (message) {
27fa680f SH	229	print_hex_dump_bytes("Client: Received [API]: ", DUMP_PREFIX_ADDRESS,
27fa680f SH	230	message, MBOX_MAX_MSG_LEN);
8ea4484d LJ	231	memcpy(tdev->rx_buffer, message, MBOX_MAX_MSG_LEN);
	232	}
	233	spin_unlock_irqrestore(&tdev->lock, flags);
	234	}
	235
	236	static void mbox_test_prepare_message(struct mbox_client client, void message)
	237	{
	238	struct mbox_test_device *tdev = dev_get_drvdata(client->dev);
	239
2d74ffdc	240	if (tdev->tx_mmio) {
8ea4484d	241	if (tdev->signal)
2d74ffdc	242	memcpy_toio(tdev->tx_mmio, tdev->message, MBOX_MAX_MSG_LEN);
8ea4484d	243	else
2d74ffdc	244	memcpy_toio(tdev->tx_mmio, message, MBOX_MAX_MSG_LEN);
8ea4484d LJ	245	}
	246	}
	247
	248	static void mbox_test_message_sent(struct mbox_client *client,
	249	void *message, int r)
	250	{
	251	if (r)
	252	dev_warn(client->dev,
	253	"Client: Message could not be sent: %d\n", r);
	254	else
	255	dev_info(client->dev,
	256	"Client: Message sent\n");
	257	}
	258
	259	static struct mbox_chan *
	260	mbox_test_request_channel(struct platform_device pdev, const char name)
	261	{
	262	struct mbox_client *client;
	263	struct mbox_chan *channel;
	264
	265	client = devm_kzalloc(&pdev->dev, sizeof(*client), GFP_KERNEL);
	266	if (!client)
	267	return ERR_PTR(-ENOMEM);
	268
	269	client->dev = &pdev->dev;
	270	client->rx_callback = mbox_test_receive_message;
	271	client->tx_prepare = mbox_test_prepare_message;
	272	client->tx_done = mbox_test_message_sent;
	273	client->tx_block = true;
	274	client->knows_txdone = false;
	275	client->tx_tout = 500;
	276
	277	channel = mbox_request_channel_byname(client, name);
	278	if (IS_ERR(channel)) {
	279	dev_warn(&pdev->dev, "Failed to request %s channel\n", name);
	280	return NULL;
	281	}
	282
	283	return channel;
	284	}
	285
	286	static int mbox_test_probe(struct platform_device *pdev)
	287	{
	288	struct mbox_test_device *tdev;
	289	struct resource *res;
	290	int ret;
	291
	292	tdev = devm_kzalloc(&pdev->dev, sizeof(*tdev), GFP_KERNEL);
	293	if (!tdev)
	294	return -ENOMEM;
	295
	296	/* It's okay for MMIO to be NULL */
	297	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
2d74ffdc SH	298	tdev->tx_mmio = devm_ioremap_resource(&pdev->dev, res);
	299	if (IS_ERR(tdev->tx_mmio))
	300	tdev->tx_mmio = NULL;
	301
	302	/* If specified, second reg entry is Rx MMIO */
	303	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
	304	tdev->rx_mmio = devm_ioremap_resource(&pdev->dev, res);
	305	if (IS_ERR(tdev->rx_mmio))
	306	tdev->rx_mmio = tdev->tx_mmio;
8ea4484d LJ	307
	308	tdev->tx_channel = mbox_test_request_channel(pdev, "tx");
	309	tdev->rx_channel = mbox_test_request_channel(pdev, "rx");
	310
6c03663f	311	if (!tdev->tx_channel && !tdev->rx_channel)
8ea4484d LJ	312	return -EPROBE_DEFER;
8ea4484d LJ	313
2d74ffdc SH	314	/* If Rx is not specified but has Rx MMIO, then Rx = Tx */
	315	if (!tdev->rx_channel && (tdev->rx_mmio != tdev->tx_mmio))
	316	tdev->rx_channel = tdev->tx_channel;
	317
8ea4484d LJ	318	tdev->dev = &pdev->dev;
	319	platform_set_drvdata(pdev, tdev);
	320
	321	spin_lock_init(&tdev->lock);
	322
	323	if (tdev->rx_channel) {
	324	tdev->rx_buffer = devm_kzalloc(&pdev->dev,
	325	MBOX_MAX_MSG_LEN, GFP_KERNEL);
	326	if (!tdev->rx_buffer)
	327	return -ENOMEM;
	328	}
	329
	330	ret = mbox_test_add_debugfs(pdev, tdev);
	331	if (ret)
	332	return ret;
	333
	334	dev_info(&pdev->dev, "Successfully registered\n");
	335
	336	return 0;
	337	}
	338
	339	static int mbox_test_remove(struct platform_device *pdev)
	340	{
	341	struct mbox_test_device *tdev = platform_get_drvdata(pdev);
	342
	343	debugfs_remove_recursive(root_debugfs_dir);
	344
	345	if (tdev->tx_channel)
	346	mbox_free_channel(tdev->tx_channel);
	347	if (tdev->rx_channel)
	348	mbox_free_channel(tdev->rx_channel);
	349
	350	return 0;
	351	}
	352
	353	static const struct of_device_id mbox_test_match[] = {
c4280137	354	{ .compatible = "mailbox-test" },
8ea4484d LJ	355	{},
	356	};
	357
	358	static struct platform_driver mbox_test_driver = {
	359	.driver = {
adf06ba9	360	.name = "mailbox_test",
8ea4484d LJ	361	.of_match_table = mbox_test_match,
	362	},
	363	.probe = mbox_test_probe,
	364	.remove = mbox_test_remove,
	365	};
	366	module_platform_driver(mbox_test_driver);
	367
	368	MODULE_DESCRIPTION("Generic Mailbox Testing Facility");
	369	MODULE_AUTHOR("Lee Jones <lee.jones@linaro.org");
	370	MODULE_LICENSE("GPL v2");