[linux-block.git] / drivers / firmware / imx / imx-scu.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright 2018 NXP
 *  Author: Dong Aisheng <aisheng.dong@nxp.com>
 *
 * Implementation of the SCU IPC functions using MUs (client side).
 *
 */

#include <linux/err.h>
#include <linux/firmware/imx/types.h>
#include <linux/firmware/imx/ipc.h>
#include <linux/firmware/imx/sci.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/mailbox_client.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of_platform.h>
#include <linux/platform_device.h>

#define SCU_MU_CHAN_NUM		8
#define MAX_RX_TIMEOUT		(msecs_to_jiffies(30))

struct imx_sc_chan {
	struct imx_sc_ipc *sc_ipc;

	struct mbox_client cl;
	struct mbox_chan *ch;
	int idx;
	struct completion tx_done;
};

struct imx_sc_ipc {
	/* SCU uses 4 Tx and 4 Rx channels */
	struct imx_sc_chan chans[SCU_MU_CHAN_NUM];
	struct device *dev;
	struct mutex lock;
	struct completion done;

	/* temporarily store the SCU msg */
	u32 *msg;
	u8 rx_size;
	u8 count;
};

/*
 * This type is used to indicate error response for most functions.
 */
enum imx_sc_error_codes {
	IMX_SC_ERR_NONE = 0,	/* Success */
	IMX_SC_ERR_VERSION = 1,	/* Incompatible API version */
	IMX_SC_ERR_CONFIG = 2,	/* Configuration error */
	IMX_SC_ERR_PARM = 3,	/* Bad parameter */
	IMX_SC_ERR_NOACCESS = 4,	/* Permission error (no access) */
	IMX_SC_ERR_LOCKED = 5,	/* Permission error (locked) */
	IMX_SC_ERR_UNAVAILABLE = 6,	/* Unavailable (out of resources) */
	IMX_SC_ERR_NOTFOUND = 7,	/* Not found */
	IMX_SC_ERR_NOPOWER = 8,	/* No power */
	IMX_SC_ERR_IPC = 9,		/* Generic IPC error */
	IMX_SC_ERR_BUSY = 10,	/* Resource is currently busy/active */
	IMX_SC_ERR_FAIL = 11,	/* General I/O failure */
	IMX_SC_ERR_LAST
};

static int imx_sc_linux_errmap[IMX_SC_ERR_LAST] = {
	0,	 /* IMX_SC_ERR_NONE */
	-EINVAL, /* IMX_SC_ERR_VERSION */
	-EINVAL, /* IMX_SC_ERR_CONFIG */
	-EINVAL, /* IMX_SC_ERR_PARM */
	-EACCES, /* IMX_SC_ERR_NOACCESS */
	-EACCES, /* IMX_SC_ERR_LOCKED */
	-ERANGE, /* IMX_SC_ERR_UNAVAILABLE */
	-EEXIST, /* IMX_SC_ERR_NOTFOUND */
	-EPERM,	 /* IMX_SC_ERR_NOPOWER */
	-EPIPE,	 /* IMX_SC_ERR_IPC */
	-EBUSY,	 /* IMX_SC_ERR_BUSY */
	-EIO,	 /* IMX_SC_ERR_FAIL */
};

static struct imx_sc_ipc *imx_sc_ipc_handle;

static inline int imx_sc_to_linux_errno(int errno)
{
	if (errno >= IMX_SC_ERR_NONE && errno < IMX_SC_ERR_LAST)
		return imx_sc_linux_errmap[errno];
	return -EIO;
}

/*
 * Get the default handle used by SCU
 */
int imx_scu_get_handle(struct imx_sc_ipc **ipc)
{
	if (!imx_sc_ipc_handle)
		return -EPROBE_DEFER;

	*ipc = imx_sc_ipc_handle;
	return 0;
}
EXPORT_SYMBOL(imx_scu_get_handle);

/* Callback called when the word of a message is ack-ed, eg read by SCU */
static void imx_scu_tx_done(struct mbox_client *cl, void *mssg, int r)
{
	struct imx_sc_chan *sc_chan = container_of(cl, struct imx_sc_chan, cl);

	complete(&sc_chan->tx_done);
}

static void imx_scu_rx_callback(struct mbox_client *c, void *msg)
{
	struct imx_sc_chan *sc_chan = container_of(c, struct imx_sc_chan, cl);
	struct imx_sc_ipc *sc_ipc = sc_chan->sc_ipc;
	struct imx_sc_rpc_msg *hdr;
	u32 *data = msg;

	if (!sc_ipc->msg) {
		dev_warn(sc_ipc->dev, "unexpected rx idx %d 0x%08x, ignore!\n",
				sc_chan->idx, *data);
		return;
	}

	if (sc_chan->idx == 0) {
		hdr = msg;
		sc_ipc->rx_size = hdr->size;
		dev_dbg(sc_ipc->dev, "msg rx size %u\n", sc_ipc->rx_size);
		if (sc_ipc->rx_size > 4)
			dev_warn(sc_ipc->dev, "RPC does not support receiving over 4 words: %u\n",
				 sc_ipc->rx_size);
	}

	sc_ipc->msg[sc_chan->idx] = *data;
	sc_ipc->count++;

	dev_dbg(sc_ipc->dev, "mu %u msg %u 0x%x\n", sc_chan->idx,
		sc_ipc->count, *data);

	if ((sc_ipc->rx_size != 0) && (sc_ipc->count == sc_ipc->rx_size))
		complete(&sc_ipc->done);
}

static int imx_scu_ipc_write(struct imx_sc_ipc *sc_ipc, void *msg)
{
	struct imx_sc_rpc_msg *hdr = msg;
	struct imx_sc_chan *sc_chan;
	u32 *data = msg;
	int ret;
	int i;

	/* Check size */
	if (hdr->size > IMX_SC_RPC_MAX_MSG)
		return -EINVAL;

	dev_dbg(sc_ipc->dev, "RPC SVC %u FUNC %u SIZE %u\n", hdr->svc,
		hdr->func, hdr->size);

	for (i = 0; i < hdr->size; i++) {
		sc_chan = &sc_ipc->chans[i % 4];

		/*
		 * SCU requires that all messages words are written
		 * sequentially but linux MU driver implements multiple
		 * independent channels for each register so ordering between
		 * different channels must be ensured by SCU API interface.
		 *
		 * Wait for tx_done before every send to ensure that no
		 * queueing happens at the mailbox channel level.
		 */
		wait_for_completion(&sc_chan->tx_done);
		reinit_completion(&sc_chan->tx_done);

		ret = mbox_send_message(sc_chan->ch, &data[i]);
		if (ret < 0)
			return ret;
	}

	return 0;
}

/*
 * RPC command/response
 */
int imx_scu_call_rpc(struct imx_sc_ipc *sc_ipc, void *msg, bool have_resp)
{
	uint8_t saved_svc, saved_func;
	struct imx_sc_rpc_msg *hdr;
	int ret;

	if (WARN_ON(!sc_ipc || !msg))
		return -EINVAL;

	mutex_lock(&sc_ipc->lock);
	reinit_completion(&sc_ipc->done);

	if (have_resp) {
		sc_ipc->msg = msg;
		saved_svc = ((struct imx_sc_rpc_msg *)msg)->svc;
		saved_func = ((struct imx_sc_rpc_msg *)msg)->func;
	}
	sc_ipc->count = 0;
	ret = imx_scu_ipc_write(sc_ipc, msg);
	if (ret < 0) {
		dev_err(sc_ipc->dev, "RPC send msg failed: %d\n", ret);
		goto out;
	}

	if (have_resp) {
		if (!wait_for_completion_timeout(&sc_ipc->done,
						 MAX_RX_TIMEOUT)) {
			dev_err(sc_ipc->dev, "RPC send msg timeout\n");
			mutex_unlock(&sc_ipc->lock);
			return -ETIMEDOUT;
		}

		/* response status is stored in hdr->func field */
		hdr = msg;
		ret = hdr->func;
		/*
		 * Some special SCU firmware APIs do NOT have return value
		 * in hdr->func, but they do have response data, those special
		 * APIs are defined as void function in SCU firmware, so they
		 * should be treated as return success always.
		 */
		if ((saved_svc == IMX_SC_RPC_SVC_MISC) &&
			(saved_func == IMX_SC_MISC_FUNC_UNIQUE_ID ||
			 saved_func == IMX_SC_MISC_FUNC_GET_BUTTON_STATUS))
			ret = 0;
	}

out:
	sc_ipc->msg = NULL;
	mutex_unlock(&sc_ipc->lock);

	dev_dbg(sc_ipc->dev, "RPC SVC done\n");

	return imx_sc_to_linux_errno(ret);
}
EXPORT_SYMBOL(imx_scu_call_rpc);

static int imx_scu_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct imx_sc_ipc *sc_ipc;
	struct imx_sc_chan *sc_chan;
	struct mbox_client *cl;
	char *chan_name;
	int ret;
	int i;

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

	for (i = 0; i < SCU_MU_CHAN_NUM; i++) {
		if (i < 4)
			chan_name = kasprintf(GFP_KERNEL, "tx%d", i);
		else
			chan_name = kasprintf(GFP_KERNEL, "rx%d", i - 4);

		if (!chan_name)
			return -ENOMEM;

		sc_chan = &sc_ipc->chans[i];
		cl = &sc_chan->cl;
		cl->dev = dev;
		cl->tx_block = false;
		cl->knows_txdone = true;
		cl->rx_callback = imx_scu_rx_callback;

		/* Initial tx_done completion as "done" */
		cl->tx_done = imx_scu_tx_done;
		init_completion(&sc_chan->tx_done);
		complete(&sc_chan->tx_done);

		sc_chan->sc_ipc = sc_ipc;
		sc_chan->idx = i % 4;
		sc_chan->ch = mbox_request_channel_byname(cl, chan_name);
		if (IS_ERR(sc_chan->ch)) {
			ret = PTR_ERR(sc_chan->ch);
			if (ret != -EPROBE_DEFER)
				dev_err(dev, "Failed to request mbox chan %s ret %d\n",
					chan_name, ret);
			return ret;
		}

		dev_dbg(dev, "request mbox chan %s\n", chan_name);
		/* chan_name is not used anymore by framework */
		kfree(chan_name);
	}

	sc_ipc->dev = dev;
	mutex_init(&sc_ipc->lock);
	init_completion(&sc_ipc->done);

	imx_sc_ipc_handle = sc_ipc;

	ret = imx_scu_enable_general_irq_channel(dev);
	if (ret)
		dev_warn(dev,
			"failed to enable general irq channel: %d\n", ret);

	dev_info(dev, "NXP i.MX SCU Initialized\n");

	return devm_of_platform_populate(dev);
}

static const struct of_device_id imx_scu_match[] = {
	{ .compatible = "fsl,imx-scu", },
	{ /* Sentinel */ }
};

static struct platform_driver imx_scu_driver = {
	.driver = {
		.name = "imx-scu",
		.of_match_table = imx_scu_match,
	},
	.probe = imx_scu_probe,
};
builtin_platform_driver(imx_scu_driver);

MODULE_AUTHOR("Dong Aisheng <aisheng.dong@nxp.com>");
MODULE_DESCRIPTION("IMX SCU firmware protocol driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
edbee095 DA	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Copyright 2018 NXP
	4	* Author: Dong Aisheng <aisheng.dong@nxp.com>
	5	*
	6	* Implementation of the SCU IPC functions using MUs (client side).
	7	*
	8	*/
	9
	10	#include <linux/err.h>
	11	#include <linux/firmware/imx/types.h>
	12	#include <linux/firmware/imx/ipc.h>
851826c7	13	#include <linux/firmware/imx/sci.h>
edbee095 DA	14	#include <linux/interrupt.h>
	15	#include <linux/irq.h>
	16	#include <linux/kernel.h>
	17	#include <linux/mailbox_client.h>
	18	#include <linux/module.h>
	19	#include <linux/mutex.h>
	20	#include <linux/of_platform.h>
	21	#include <linux/platform_device.h>
	22
	23	#define SCU_MU_CHAN_NUM 8
	24	#define MAX_RX_TIMEOUT (msecs_to_jiffies(30))
	25
	26	struct imx_sc_chan {
	27	struct imx_sc_ipc *sc_ipc;
	28
	29	struct mbox_client cl;
	30	struct mbox_chan *ch;
	31	int idx;
26d0fba2	32	struct completion tx_done;
edbee095 DA	33	};
	34
	35	struct imx_sc_ipc {
	36	/* SCU uses 4 Tx and 4 Rx channels */
	37	struct imx_sc_chan chans[SCU_MU_CHAN_NUM];
	38	struct device *dev;
	39	struct mutex lock;
	40	struct completion done;
	41
	42	/* temporarily store the SCU msg */
	43	u32 *msg;
	44	u8 rx_size;
	45	u8 count;
	46	};
	47
	48	/*
	49	* This type is used to indicate error response for most functions.
	50	*/
	51	enum imx_sc_error_codes {
	52	IMX_SC_ERR_NONE = 0, /* Success */
	53	IMX_SC_ERR_VERSION = 1, /* Incompatible API version */
	54	IMX_SC_ERR_CONFIG = 2, /* Configuration error */
	55	IMX_SC_ERR_PARM = 3, /* Bad parameter */
	56	IMX_SC_ERR_NOACCESS = 4, /* Permission error (no access) */
	57	IMX_SC_ERR_LOCKED = 5, /* Permission error (locked) */
	58	IMX_SC_ERR_UNAVAILABLE = 6, /* Unavailable (out of resources) */
	59	IMX_SC_ERR_NOTFOUND = 7, /* Not found */
	60	IMX_SC_ERR_NOPOWER = 8, /* No power */
	61	IMX_SC_ERR_IPC = 9, /* Generic IPC error */
	62	IMX_SC_ERR_BUSY = 10, /* Resource is currently busy/active */
	63	IMX_SC_ERR_FAIL = 11, /* General I/O failure */
	64	IMX_SC_ERR_LAST
	65	};
	66
	67	static int imx_sc_linux_errmap[IMX_SC_ERR_LAST] = {
	68	0, /* IMX_SC_ERR_NONE */
	69	-EINVAL, /* IMX_SC_ERR_VERSION */
	70	-EINVAL, /* IMX_SC_ERR_CONFIG */
	71	-EINVAL, /* IMX_SC_ERR_PARM */
	72	-EACCES, /* IMX_SC_ERR_NOACCESS */
	73	-EACCES, /* IMX_SC_ERR_LOCKED */
	74	-ERANGE, /* IMX_SC_ERR_UNAVAILABLE */
	75	-EEXIST, /* IMX_SC_ERR_NOTFOUND */
	76	-EPERM, /* IMX_SC_ERR_NOPOWER */
	77	-EPIPE, /* IMX_SC_ERR_IPC */
	78	-EBUSY, /* IMX_SC_ERR_BUSY */
	79	-EIO, /* IMX_SC_ERR_FAIL */
	80	};
	81
	82	static struct imx_sc_ipc *imx_sc_ipc_handle;
	83
	84	static inline int imx_sc_to_linux_errno(int errno)
	85	{
	86	if (errno >= IMX_SC_ERR_NONE && errno < IMX_SC_ERR_LAST)
	87	return imx_sc_linux_errmap[errno];
	88	return -EIO;
	89	}
	90
	91	/*
	92	* Get the default handle used by SCU
	93	*/
	94	int imx_scu_get_handle(struct imx_sc_ipc **ipc)
	95	{
	96	if (!imx_sc_ipc_handle)
97	return -EPROBE_DEFER;
98
99	*ipc = imx_sc_ipc_handle;
100	return 0;
101	}
102	EXPORT_SYMBOL(imx_scu_get_handle);
103
26d0fba2 LC	104	/* Callback called when the word of a message is ack-ed, eg read by SCU */
	105	static void imx_scu_tx_done(struct mbox_client cl, void mssg, int r)
	106	{
	107	struct imx_sc_chan *sc_chan = container_of(cl, struct imx_sc_chan, cl);
	108
	109	complete(&sc_chan->tx_done);
	110	}
	111
edbee095 DA	112	static void imx_scu_rx_callback(struct mbox_client c, void msg)
	113	{
	114	struct imx_sc_chan *sc_chan = container_of(c, struct imx_sc_chan, cl);
	115	struct imx_sc_ipc *sc_ipc = sc_chan->sc_ipc;
	116	struct imx_sc_rpc_msg *hdr;
	117	u32 *data = msg;
	118
cf0fd404 LC	119	if (!sc_ipc->msg) {
	120	dev_warn(sc_ipc->dev, "unexpected rx idx %d 0x%08x, ignore!\n",
	121	sc_chan->idx, *data);
	122	return;
	123	}
	124
edbee095 DA	125	if (sc_chan->idx == 0) {
	126	hdr = msg;
	127	sc_ipc->rx_size = hdr->size;
	128	dev_dbg(sc_ipc->dev, "msg rx size %u\n", sc_ipc->rx_size);
	129	if (sc_ipc->rx_size > 4)
	130	dev_warn(sc_ipc->dev, "RPC does not support receiving over 4 words: %u\n",
	131	sc_ipc->rx_size);
	132	}
	133
	134	sc_ipc->msg[sc_chan->idx] = *data;
	135	sc_ipc->count++;
	136
	137	dev_dbg(sc_ipc->dev, "mu %u msg %u 0x%x\n", sc_chan->idx,
	138	sc_ipc->count, *data);
	139
	140	if ((sc_ipc->rx_size != 0) && (sc_ipc->count == sc_ipc->rx_size))
	141	complete(&sc_ipc->done);
	142	}
	143
	144	static int imx_scu_ipc_write(struct imx_sc_ipc sc_ipc, void msg)
	145	{
	146	struct imx_sc_rpc_msg *hdr = msg;
	147	struct imx_sc_chan *sc_chan;
	148	u32 *data = msg;
	149	int ret;
	150	int i;
	151
	152	/* Check size */
	153	if (hdr->size > IMX_SC_RPC_MAX_MSG)
	154	return -EINVAL;
	155
	156	dev_dbg(sc_ipc->dev, "RPC SVC %u FUNC %u SIZE %u\n", hdr->svc,
	157	hdr->func, hdr->size);
	158
	159	for (i = 0; i < hdr->size; i++) {
	160	sc_chan = &sc_ipc->chans[i % 4];
26d0fba2 LC	161
	162	/*
	163	* SCU requires that all messages words are written
	164	* sequentially but linux MU driver implements multiple
	165	* independent channels for each register so ordering between
	166	* different channels must be ensured by SCU API interface.
	167	*
	168	* Wait for tx_done before every send to ensure that no
	169	* queueing happens at the mailbox channel level.
	170	*/
	171	wait_for_completion(&sc_chan->tx_done);
	172	reinit_completion(&sc_chan->tx_done);
	173
edbee095 DA	174	ret = mbox_send_message(sc_chan->ch, &data[i]);
	175	if (ret < 0)
	176	return ret;
	177	}
	178
	179	return 0;
	180	}
	181
	182	/*
	183	* RPC command/response
	184	*/
	185	int imx_scu_call_rpc(struct imx_sc_ipc sc_ipc, void msg, bool have_resp)
	186	{
51f5afab	187	uint8_t saved_svc, saved_func;
edbee095 DA	188	struct imx_sc_rpc_msg *hdr;
	189	int ret;
	190
	191	if (WARN_ON(!sc_ipc \|\| !msg))
	192	return -EINVAL;
	193
	194	mutex_lock(&sc_ipc->lock);
	195	reinit_completion(&sc_ipc->done);
	196
51f5afab	197	if (have_resp) {
cf0fd404	198	sc_ipc->msg = msg;
51f5afab AH	199	saved_svc = ((struct imx_sc_rpc_msg *)msg)->svc;
	200	saved_func = ((struct imx_sc_rpc_msg *)msg)->func;
	201	}
edbee095 DA	202	sc_ipc->count = 0;
	203	ret = imx_scu_ipc_write(sc_ipc, msg);
	204	if (ret < 0) {
	205	dev_err(sc_ipc->dev, "RPC send msg failed: %d\n", ret);
	206	goto out;
	207	}
	208
	209	if (have_resp) {
	210	if (!wait_for_completion_timeout(&sc_ipc->done,
	211	MAX_RX_TIMEOUT)) {
	212	dev_err(sc_ipc->dev, "RPC send msg timeout\n");
	213	mutex_unlock(&sc_ipc->lock);
	214	return -ETIMEDOUT;
	215	}
	216
	217	/* response status is stored in hdr->func field */
	218	hdr = msg;
	219	ret = hdr->func;
51f5afab AH	220	/*
	221	* Some special SCU firmware APIs do NOT have return value
	222	* in hdr->func, but they do have response data, those special
	223	* APIs are defined as void function in SCU firmware, so they
	224	* should be treated as return success always.
	225	*/
	226	if ((saved_svc == IMX_SC_RPC_SVC_MISC) &&
	227	(saved_func == IMX_SC_MISC_FUNC_UNIQUE_ID \|\|
	228	saved_func == IMX_SC_MISC_FUNC_GET_BUTTON_STATUS))
	229	ret = 0;
edbee095 DA	230	}
	231
	232	out:
cf0fd404	233	sc_ipc->msg = NULL;
edbee095 DA	234	mutex_unlock(&sc_ipc->lock);
	235
	236	dev_dbg(sc_ipc->dev, "RPC SVC done\n");
	237
	238	return imx_sc_to_linux_errno(ret);
	239	}
	240	EXPORT_SYMBOL(imx_scu_call_rpc);
	241
	242	static int imx_scu_probe(struct platform_device *pdev)
	243	{
	244	struct device *dev = &pdev->dev;
	245	struct imx_sc_ipc *sc_ipc;
	246	struct imx_sc_chan *sc_chan;
	247	struct mbox_client *cl;
	248	char *chan_name;
	249	int ret;
	250	int i;
	251
	252	sc_ipc = devm_kzalloc(dev, sizeof(*sc_ipc), GFP_KERNEL);
	253	if (!sc_ipc)
	254	return -ENOMEM;
	255
	256	for (i = 0; i < SCU_MU_CHAN_NUM; i++) {
	257	if (i < 4)
	258	chan_name = kasprintf(GFP_KERNEL, "tx%d", i);
	259	else
	260	chan_name = kasprintf(GFP_KERNEL, "rx%d", i - 4);
	261
	262	if (!chan_name)
	263	return -ENOMEM;
	264
	265	sc_chan = &sc_ipc->chans[i];
	266	cl = &sc_chan->cl;
	267	cl->dev = dev;
	268	cl->tx_block = false;
	269	cl->knows_txdone = true;
	270	cl->rx_callback = imx_scu_rx_callback;
	271
26d0fba2 LC	272	/* Initial tx_done completion as "done" */
	273	cl->tx_done = imx_scu_tx_done;
	274	init_completion(&sc_chan->tx_done);
	275	complete(&sc_chan->tx_done);
	276
edbee095 DA	277	sc_chan->sc_ipc = sc_ipc;
	278	sc_chan->idx = i % 4;
	279	sc_chan->ch = mbox_request_channel_byname(cl, chan_name);
	280	if (IS_ERR(sc_chan->ch)) {
	281	ret = PTR_ERR(sc_chan->ch);
	282	if (ret != -EPROBE_DEFER)
	283	dev_err(dev, "Failed to request mbox chan %s ret %d\n",
	284	chan_name, ret);
	285	return ret;
	286	}
	287
	288	dev_dbg(dev, "request mbox chan %s\n", chan_name);
	289	/* chan_name is not used anymore by framework */
	290	kfree(chan_name);
	291	}
	292
	293	sc_ipc->dev = dev;
	294	mutex_init(&sc_ipc->lock);
	295	init_completion(&sc_ipc->done);
	296
	297	imx_sc_ipc_handle = sc_ipc;
	298
851826c7 AH	299	ret = imx_scu_enable_general_irq_channel(dev);
	300	if (ret)
	301	dev_warn(dev,
	302	"failed to enable general irq channel: %d\n", ret);
	303
edbee095 DA	304	dev_info(dev, "NXP i.MX SCU Initialized\n");
	305
	306	return devm_of_platform_populate(dev);
	307	}
	308
	309	static const struct of_device_id imx_scu_match[] = {
	310	{ .compatible = "fsl,imx-scu", },
	311	{ /* Sentinel */ }
	312	};
	313
	314	static struct platform_driver imx_scu_driver = {
	315	.driver = {
	316	.name = "imx-scu",
	317	.of_match_table = imx_scu_match,
	318	},
	319	.probe = imx_scu_probe,
	320	};
	321	builtin_platform_driver(imx_scu_driver);
	322
	323	MODULE_AUTHOR("Dong Aisheng <aisheng.dong@nxp.com>");
	324	MODULE_DESCRIPTION("IMX SCU firmware protocol driver");
	325	MODULE_LICENSE("GPL v2");