drivers/soc/mediatek/mtk-cmdq-helper.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 //
 // Copyright (c) 2018 MediaTek Inc.

 #include <linux/completion.h>
 #include <linux/errno.h>
 #include <linux/dma-mapping.h>
 #include <linux/module.h>
 #include <linux/mailbox_controller.h>
 #include <linux/soc/mediatek/mtk-cmdq.h>

 #define CMDQ_WRITE_ENABLE_MASK	BIT(0)
 #define CMDQ_POLL_ENABLE_MASK	BIT(0)
 #define CMDQ_EOC_IRQ_EN		BIT(0)
 #define CMDQ_REG_TYPE		1

 struct cmdq_instruction {
 	union {
 		u32 value;
 		u32 mask;
 	};
 	union {
 		u16 offset;
 		u16 event;
 		u16 reg_dst;
 	};
 	union {
 		u8 subsys;
 		struct {
 			u8 sop:5;
 			u8 arg_c_t:1;
 			u8 src_t:1;
 			u8 dst_t:1;
 		};
 	};
 	u8 op;
 };

 int cmdq_dev_get_client_reg(struct device *dev,
 			    struct cmdq_client_reg *client_reg, int idx)
 {
 	struct of_phandle_args spec;
 	int err;

 	if (!client_reg)
 		return -ENOENT;

 	err = of_parse_phandle_with_fixed_args(dev->of_node,
 					       "mediatek,gce-client-reg",
 					       3, idx, &spec);
 	if (err < 0) {
 		dev_err(dev,
 			"error %d can't parse gce-client-reg property (%d)",
 			err, idx);

 		return err;
 	}

 	client_reg->subsys = (u8)spec.args[0];
 	client_reg->offset = (u16)spec.args[1];
 	client_reg->size = (u16)spec.args[2];
 	of_node_put(spec.np);

 	return 0;
 }
 EXPORT_SYMBOL(cmdq_dev_get_client_reg);

 static void cmdq_client_timeout(struct timer_list *t)
 {
 	struct cmdq_client *client = from_timer(client, t, timer);

 	dev_err(client->client.dev, "cmdq timeout!\n");
 }

 struct cmdq_client *cmdq_mbox_create(struct device *dev, int index, u32 timeout)
 {
 	struct cmdq_client *client;

 	client = kzalloc(sizeof(*client), GFP_KERNEL);
 	if (!client)
 		return (struct cmdq_client *)-ENOMEM;

 	client->timeout_ms = timeout;
 	if (timeout != CMDQ_NO_TIMEOUT) {
 		spin_lock_init(&client->lock);
 		timer_setup(&client->timer, cmdq_client_timeout, 0);
 	}
 	client->pkt_cnt = 0;
 	client->client.dev = dev;
 	client->client.tx_block = false;
 	client->client.knows_txdone = true;
 	client->chan = mbox_request_channel(&client->client, index);

 	if (IS_ERR(client->chan)) {
 		long err;

 		dev_err(dev, "failed to request channel\n");
 		err = PTR_ERR(client->chan);
 		kfree(client);

 		return ERR_PTR(err);
 	}

 	return client;
 }
 EXPORT_SYMBOL(cmdq_mbox_create);

 void cmdq_mbox_destroy(struct cmdq_client *client)
 {
 	if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
 		spin_lock(&client->lock);
 		del_timer_sync(&client->timer);
 		spin_unlock(&client->lock);
 	}
 	mbox_free_channel(client->chan);
 	kfree(client);
 }
 EXPORT_SYMBOL(cmdq_mbox_destroy);

 struct cmdq_pkt *cmdq_pkt_create(struct cmdq_client *client, size_t size)
 {
 	struct cmdq_pkt *pkt;
 	struct device *dev;
 	dma_addr_t dma_addr;

 	pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
 	if (!pkt)
 		return ERR_PTR(-ENOMEM);
 	pkt->va_base = kzalloc(size, GFP_KERNEL);
 	if (!pkt->va_base) {
 		kfree(pkt);
 		return ERR_PTR(-ENOMEM);
 	}
 	pkt->buf_size = size;
 	pkt->cl = (void *)client;

 	dev = client->chan->mbox->dev;
 	dma_addr = dma_map_single(dev, pkt->va_base, pkt->buf_size,
 				  DMA_TO_DEVICE);
 	if (dma_mapping_error(dev, dma_addr)) {
 		dev_err(dev, "dma map failed, size=%u\n", (u32)(u64)size);
 		kfree(pkt->va_base);
 		kfree(pkt);
 		return ERR_PTR(-ENOMEM);
 	}

 	pkt->pa_base = dma_addr;

 	return pkt;
 }
 EXPORT_SYMBOL(cmdq_pkt_create);

 void cmdq_pkt_destroy(struct cmdq_pkt *pkt)
 {
 	struct cmdq_client *client = (struct cmdq_client *)pkt->cl;

 	dma_unmap_single(client->chan->mbox->dev, pkt->pa_base, pkt->buf_size,
 			 DMA_TO_DEVICE);
 	kfree(pkt->va_base);
 	kfree(pkt);
 }
 EXPORT_SYMBOL(cmdq_pkt_destroy);

 static int cmdq_pkt_append_command(struct cmdq_pkt *pkt,
 				   struct cmdq_instruction inst)
 {
 	struct cmdq_instruction *cmd_ptr;

 	if (unlikely(pkt->cmd_buf_size + CMDQ_INST_SIZE > pkt->buf_size)) {
 		/*
 		 * In the case of allocated buffer size (pkt->buf_size) is used
 		 * up, the real required size (pkt->cmdq_buf_size) is still
 		 * increased, so that the user knows how much memory should be
 		 * ultimately allocated after appending all commands and
 		 * flushing the command packet. Therefor, the user can call
 		 * cmdq_pkt_create() again with the real required buffer size.
 		 */
 		pkt->cmd_buf_size += CMDQ_INST_SIZE;
 		WARN_ONCE(1, "%s: buffer size %u is too small !\n",
 			__func__, (u32)pkt->buf_size);
 		return -ENOMEM;
 	}

 	cmd_ptr = pkt->va_base + pkt->cmd_buf_size;
 	*cmd_ptr = inst;
 	pkt->cmd_buf_size += CMDQ_INST_SIZE;

 	return 0;
 }

 int cmdq_pkt_write(struct cmdq_pkt *pkt, u8 subsys, u16 offset, u32 value)
 {
 	struct cmdq_instruction inst;

 	inst.op = CMDQ_CODE_WRITE;
 	inst.value = value;
 	inst.offset = offset;
 	inst.subsys = subsys;

 	return cmdq_pkt_append_command(pkt, inst);
 }
 EXPORT_SYMBOL(cmdq_pkt_write);

 int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys,
 			u16 offset, u32 value, u32 mask)
 {
 	struct cmdq_instruction inst = { {0} };
 	u16 offset_mask = offset;
 	int err;

 	if (mask != 0xffffffff) {
 		inst.op = CMDQ_CODE_MASK;
 		inst.mask = ~mask;
 		err = cmdq_pkt_append_command(pkt, inst);
 		if (err < 0)
 			return err;

 		offset_mask |= CMDQ_WRITE_ENABLE_MASK;
 	}
 	err = cmdq_pkt_write(pkt, subsys, offset_mask, value);

 	return err;
 }
 EXPORT_SYMBOL(cmdq_pkt_write_mask);

 int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event)
 {
 	struct cmdq_instruction inst = { {0} };

 	if (event >= CMDQ_MAX_EVENT)
 		return -EINVAL;

 	inst.op = CMDQ_CODE_WFE;
 	inst.value = CMDQ_WFE_OPTION;
 	inst.event = event;

 	return cmdq_pkt_append_command(pkt, inst);
 }
 EXPORT_SYMBOL(cmdq_pkt_wfe);

 int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event)
 {
 	struct cmdq_instruction inst = { {0} };

 	if (event >= CMDQ_MAX_EVENT)
 		return -EINVAL;

 	inst.op = CMDQ_CODE_WFE;
 	inst.value = CMDQ_WFE_UPDATE;
 	inst.event = event;

 	return cmdq_pkt_append_command(pkt, inst);
 }
 EXPORT_SYMBOL(cmdq_pkt_clear_event);

 int cmdq_pkt_set_event(struct cmdq_pkt *pkt, u16 event)
 {
 	struct cmdq_instruction inst = {};

 	if (event >= CMDQ_MAX_EVENT)
 		return -EINVAL;

 	inst.op = CMDQ_CODE_WFE;
 	inst.value = CMDQ_WFE_UPDATE | CMDQ_WFE_UPDATE_VALUE;
 	inst.event = event;

 	return cmdq_pkt_append_command(pkt, inst);
 }
 EXPORT_SYMBOL(cmdq_pkt_set_event);

 int cmdq_pkt_poll(struct cmdq_pkt *pkt, u8 subsys,
 		  u16 offset, u32 value)
 {
 	struct cmdq_instruction inst = { {0} };
 	int err;

 	inst.op = CMDQ_CODE_POLL;
 	inst.value = value;
 	inst.offset = offset;
 	inst.subsys = subsys;
 	err = cmdq_pkt_append_command(pkt, inst);

 	return err;
 }
 EXPORT_SYMBOL(cmdq_pkt_poll);

 int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
 		       u16 offset, u32 value, u32 mask)
 {
 	struct cmdq_instruction inst = { {0} };
 	int err;

 	inst.op = CMDQ_CODE_MASK;
 	inst.mask = ~mask;
 	err = cmdq_pkt_append_command(pkt, inst);
 	if (err < 0)
 		return err;

 	offset = offset | CMDQ_POLL_ENABLE_MASK;
 	err = cmdq_pkt_poll(pkt, subsys, offset, value);

 	return err;
 }
 EXPORT_SYMBOL(cmdq_pkt_poll_mask);

 int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value)
 {
 	struct cmdq_instruction inst = {};

 	inst.op = CMDQ_CODE_LOGIC;
 	inst.dst_t = CMDQ_REG_TYPE;
 	inst.reg_dst = reg_idx;
 	inst.value = value;
 	return cmdq_pkt_append_command(pkt, inst);
 }
 EXPORT_SYMBOL(cmdq_pkt_assign);

 int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
 {
 	struct cmdq_instruction inst = { {0} };
 	int err;

 	/* insert EOC and generate IRQ for each command iteration */
 	inst.op = CMDQ_CODE_EOC;
 	inst.value = CMDQ_EOC_IRQ_EN;
 	err = cmdq_pkt_append_command(pkt, inst);
 	if (err < 0)
 		return err;

 	/* JUMP to end */
 	inst.op = CMDQ_CODE_JUMP;
 	inst.value = CMDQ_JUMP_PASS;
 	err = cmdq_pkt_append_command(pkt, inst);

 	return err;
 }
 EXPORT_SYMBOL(cmdq_pkt_finalize);

 static void cmdq_pkt_flush_async_cb(struct cmdq_cb_data data)
 {
 	struct cmdq_pkt *pkt = (struct cmdq_pkt *)data.data;
 	struct cmdq_task_cb *cb = &pkt->cb;
 	struct cmdq_client *client = (struct cmdq_client *)pkt->cl;

 	if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
 		unsigned long flags = 0;

 		spin_lock_irqsave(&client->lock, flags);
 		if (--client->pkt_cnt == 0)
 			del_timer(&client->timer);
 		else
 			mod_timer(&client->timer, jiffies +
 				  msecs_to_jiffies(client->timeout_ms));
 		spin_unlock_irqrestore(&client->lock, flags);
 	}

 	dma_sync_single_for_cpu(client->chan->mbox->dev, pkt->pa_base,
 				pkt->cmd_buf_size, DMA_TO_DEVICE);
 	if (cb->cb) {
 		data.data = cb->data;
 		cb->cb(data);
 	}
 }

 int cmdq_pkt_flush_async(struct cmdq_pkt *pkt, cmdq_async_flush_cb cb,
 			 void *data)
 {
 	int err;
 	unsigned long flags = 0;
 	struct cmdq_client *client = (struct cmdq_client *)pkt->cl;

 	pkt->cb.cb = cb;
 	pkt->cb.data = data;
 	pkt->async_cb.cb = cmdq_pkt_flush_async_cb;
 	pkt->async_cb.data = pkt;

 	dma_sync_single_for_device(client->chan->mbox->dev, pkt->pa_base,
 				   pkt->cmd_buf_size, DMA_TO_DEVICE);

 	if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
 		spin_lock_irqsave(&client->lock, flags);
 		if (client->pkt_cnt++ == 0)
 			mod_timer(&client->timer, jiffies +
 				  msecs_to_jiffies(client->timeout_ms));
 		spin_unlock_irqrestore(&client->lock, flags);
 	}

 	err = mbox_send_message(client->chan, pkt);
 	if (err < 0)
 		return err;
 	/* We can send next packet immediately, so just call txdone. */
 	mbox_client_txdone(client->chan, 0);

 	return 0;
 }
 EXPORT_SYMBOL(cmdq_pkt_flush_async);

 struct cmdq_flush_completion {
 	struct completion cmplt;
 	bool err;
 };

 static void cmdq_pkt_flush_cb(struct cmdq_cb_data data)
 {
 	struct cmdq_flush_completion *cmplt;

 	cmplt = (struct cmdq_flush_completion *)data.data;
 	if (data.sta != CMDQ_CB_NORMAL)
 		cmplt->err = true;
 	else
 		cmplt->err = false;
 	complete(&cmplt->cmplt);
 }

 int cmdq_pkt_flush(struct cmdq_pkt *pkt)
 {
 	struct cmdq_flush_completion cmplt;
 	int err;

 	init_completion(&cmplt.cmplt);
 	err = cmdq_pkt_flush_async(pkt, cmdq_pkt_flush_cb, &cmplt);
 	if (err < 0)
 		return err;
 	wait_for_completion(&cmplt.cmplt);

 	return cmplt.err ? -EFAULT : 0;
 }
 EXPORT_SYMBOL(cmdq_pkt_flush);

 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: GPL-2.0
	//
	// Copyright (c) 2018 MediaTek Inc.

	#include <linux/completion.h>
	#include <linux/errno.h>
	#include <linux/dma-mapping.h>
	#include <linux/module.h>
	#include <linux/mailbox_controller.h>
	#include <linux/soc/mediatek/mtk-cmdq.h>

	#define CMDQ_WRITE_ENABLE_MASK BIT(0)
	#define CMDQ_POLL_ENABLE_MASK BIT(0)
	#define CMDQ_EOC_IRQ_EN BIT(0)
	#define CMDQ_REG_TYPE 1

	struct cmdq_instruction {
	union {
	u32 value;
	u32 mask;
	};
	union {
	u16 offset;
	u16 event;
	u16 reg_dst;
	};
	union {
	u8 subsys;
	struct {
	u8 sop:5;
	u8 arg_c_t:1;
	u8 src_t:1;
	u8 dst_t:1;
	};
	};
	u8 op;
	};

	int cmdq_dev_get_client_reg(struct device *dev,
	struct cmdq_client_reg *client_reg, int idx)
	{
	struct of_phandle_args spec;
	int err;

	if (!client_reg)
	return -ENOENT;

	err = of_parse_phandle_with_fixed_args(dev->of_node,
	"mediatek,gce-client-reg",
	3, idx, &spec);
	if (err < 0) {
	dev_err(dev,
	"error %d can't parse gce-client-reg property (%d)",
	err, idx);

	return err;
	}

	client_reg->subsys = (u8)spec.args[0];
	client_reg->offset = (u16)spec.args[1];
	client_reg->size = (u16)spec.args[2];
	of_node_put(spec.np);

	return 0;
	}
	EXPORT_SYMBOL(cmdq_dev_get_client_reg);

	static void cmdq_client_timeout(struct timer_list *t)
	{
	struct cmdq_client *client = from_timer(client, t, timer);

	dev_err(client->client.dev, "cmdq timeout!\n");
	}

	struct cmdq_client cmdq_mbox_create(struct device dev, int index, u32 timeout)
	{
	struct cmdq_client *client;

	client = kzalloc(sizeof(*client), GFP_KERNEL);
	if (!client)
	return (struct cmdq_client *)-ENOMEM;

	client->timeout_ms = timeout;
	if (timeout != CMDQ_NO_TIMEOUT) {
	spin_lock_init(&client->lock);
	timer_setup(&client->timer, cmdq_client_timeout, 0);
	}
	client->pkt_cnt = 0;
	client->client.dev = dev;
	client->client.tx_block = false;
	client->client.knows_txdone = true;
	client->chan = mbox_request_channel(&client->client, index);

	if (IS_ERR(client->chan)) {
	long err;

	dev_err(dev, "failed to request channel\n");
	err = PTR_ERR(client->chan);
	kfree(client);

	return ERR_PTR(err);
	}

	return client;
	}
	EXPORT_SYMBOL(cmdq_mbox_create);

	void cmdq_mbox_destroy(struct cmdq_client *client)
	{
	if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
	spin_lock(&client->lock);
	del_timer_sync(&client->timer);
	spin_unlock(&client->lock);
	}
	mbox_free_channel(client->chan);
	kfree(client);
	}
	EXPORT_SYMBOL(cmdq_mbox_destroy);

	struct cmdq_pkt cmdq_pkt_create(struct cmdq_client client, size_t size)
	{
	struct cmdq_pkt *pkt;
	struct device *dev;
	dma_addr_t dma_addr;

	pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
	if (!pkt)
	return ERR_PTR(-ENOMEM);
	pkt->va_base = kzalloc(size, GFP_KERNEL);
	if (!pkt->va_base) {
	kfree(pkt);
	return ERR_PTR(-ENOMEM);
	}
	pkt->buf_size = size;
	pkt->cl = (void *)client;

	dev = client->chan->mbox->dev;
	dma_addr = dma_map_single(dev, pkt->va_base, pkt->buf_size,
	DMA_TO_DEVICE);
	if (dma_mapping_error(dev, dma_addr)) {
	dev_err(dev, "dma map failed, size=%u\n", (u32)(u64)size);
	kfree(pkt->va_base);
	kfree(pkt);
	return ERR_PTR(-ENOMEM);
	}

	pkt->pa_base = dma_addr;

	return pkt;
	}
	EXPORT_SYMBOL(cmdq_pkt_create);

	void cmdq_pkt_destroy(struct cmdq_pkt *pkt)
	{
	struct cmdq_client client = (struct cmdq_client )pkt->cl;

	dma_unmap_single(client->chan->mbox->dev, pkt->pa_base, pkt->buf_size,
	DMA_TO_DEVICE);
	kfree(pkt->va_base);
	kfree(pkt);
	}
	EXPORT_SYMBOL(cmdq_pkt_destroy);

	static int cmdq_pkt_append_command(struct cmdq_pkt *pkt,
	struct cmdq_instruction inst)
	{
	struct cmdq_instruction *cmd_ptr;

	if (unlikely(pkt->cmd_buf_size + CMDQ_INST_SIZE > pkt->buf_size)) {
	/*
	* In the case of allocated buffer size (pkt->buf_size) is used
	* up, the real required size (pkt->cmdq_buf_size) is still
	* increased, so that the user knows how much memory should be
	* ultimately allocated after appending all commands and
	* flushing the command packet. Therefor, the user can call
	* cmdq_pkt_create() again with the real required buffer size.
	*/
	pkt->cmd_buf_size += CMDQ_INST_SIZE;
	WARN_ONCE(1, "%s: buffer size %u is too small !\n",
	__func__, (u32)pkt->buf_size);
	return -ENOMEM;
	}

	cmd_ptr = pkt->va_base + pkt->cmd_buf_size;
	*cmd_ptr = inst;
	pkt->cmd_buf_size += CMDQ_INST_SIZE;

	return 0;
	}

	int cmdq_pkt_write(struct cmdq_pkt *pkt, u8 subsys, u16 offset, u32 value)
	{
	struct cmdq_instruction inst;

	inst.op = CMDQ_CODE_WRITE;
	inst.value = value;
	inst.offset = offset;
	inst.subsys = subsys;

	return cmdq_pkt_append_command(pkt, inst);
	}
	EXPORT_SYMBOL(cmdq_pkt_write);

	int cmdq_pkt_write_mask(struct cmdq_pkt *pkt, u8 subsys,
	u16 offset, u32 value, u32 mask)
	{
	struct cmdq_instruction inst = { {0} };
	u16 offset_mask = offset;
	int err;

	if (mask != 0xffffffff) {
	inst.op = CMDQ_CODE_MASK;
	inst.mask = ~mask;
	err = cmdq_pkt_append_command(pkt, inst);
	if (err < 0)
	return err;

	offset_mask \|= CMDQ_WRITE_ENABLE_MASK;
	}
	err = cmdq_pkt_write(pkt, subsys, offset_mask, value);

	return err;
	}
	EXPORT_SYMBOL(cmdq_pkt_write_mask);

	int cmdq_pkt_wfe(struct cmdq_pkt *pkt, u16 event)
	{
	struct cmdq_instruction inst = { {0} };

	if (event >= CMDQ_MAX_EVENT)
	return -EINVAL;

	inst.op = CMDQ_CODE_WFE;
	inst.value = CMDQ_WFE_OPTION;
	inst.event = event;

	return cmdq_pkt_append_command(pkt, inst);
	}
	EXPORT_SYMBOL(cmdq_pkt_wfe);

	int cmdq_pkt_clear_event(struct cmdq_pkt *pkt, u16 event)
	{
	struct cmdq_instruction inst = { {0} };

	if (event >= CMDQ_MAX_EVENT)
	return -EINVAL;

	inst.op = CMDQ_CODE_WFE;
	inst.value = CMDQ_WFE_UPDATE;
	inst.event = event;

	return cmdq_pkt_append_command(pkt, inst);
	}
	EXPORT_SYMBOL(cmdq_pkt_clear_event);

	int cmdq_pkt_set_event(struct cmdq_pkt *pkt, u16 event)
	{
	struct cmdq_instruction inst = {};

	if (event >= CMDQ_MAX_EVENT)
	return -EINVAL;

	inst.op = CMDQ_CODE_WFE;
	inst.value = CMDQ_WFE_UPDATE \| CMDQ_WFE_UPDATE_VALUE;
	inst.event = event;

	return cmdq_pkt_append_command(pkt, inst);
	}
	EXPORT_SYMBOL(cmdq_pkt_set_event);

	int cmdq_pkt_poll(struct cmdq_pkt *pkt, u8 subsys,
	u16 offset, u32 value)
	{
	struct cmdq_instruction inst = { {0} };
	int err;

	inst.op = CMDQ_CODE_POLL;
	inst.value = value;
	inst.offset = offset;
	inst.subsys = subsys;
	err = cmdq_pkt_append_command(pkt, inst);

	return err;
	}
	EXPORT_SYMBOL(cmdq_pkt_poll);

	int cmdq_pkt_poll_mask(struct cmdq_pkt *pkt, u8 subsys,
	u16 offset, u32 value, u32 mask)
	{
	struct cmdq_instruction inst = { {0} };
	int err;

	inst.op = CMDQ_CODE_MASK;
	inst.mask = ~mask;
	err = cmdq_pkt_append_command(pkt, inst);
	if (err < 0)
	return err;

	offset = offset \| CMDQ_POLL_ENABLE_MASK;
	err = cmdq_pkt_poll(pkt, subsys, offset, value);

	return err;
	}
	EXPORT_SYMBOL(cmdq_pkt_poll_mask);

	int cmdq_pkt_assign(struct cmdq_pkt *pkt, u16 reg_idx, u32 value)
	{
	struct cmdq_instruction inst = {};

	inst.op = CMDQ_CODE_LOGIC;
	inst.dst_t = CMDQ_REG_TYPE;
	inst.reg_dst = reg_idx;
	inst.value = value;
	return cmdq_pkt_append_command(pkt, inst);
	}
	EXPORT_SYMBOL(cmdq_pkt_assign);

	int cmdq_pkt_finalize(struct cmdq_pkt *pkt)
	{
	struct cmdq_instruction inst = { {0} };
	int err;

	/* insert EOC and generate IRQ for each command iteration */
	inst.op = CMDQ_CODE_EOC;
	inst.value = CMDQ_EOC_IRQ_EN;
	err = cmdq_pkt_append_command(pkt, inst);
	if (err < 0)
	return err;

	/* JUMP to end */
	inst.op = CMDQ_CODE_JUMP;
	inst.value = CMDQ_JUMP_PASS;
	err = cmdq_pkt_append_command(pkt, inst);

	return err;
	}
	EXPORT_SYMBOL(cmdq_pkt_finalize);

	static void cmdq_pkt_flush_async_cb(struct cmdq_cb_data data)
	{
	struct cmdq_pkt pkt = (struct cmdq_pkt )data.data;
	struct cmdq_task_cb *cb = &pkt->cb;
	struct cmdq_client client = (struct cmdq_client )pkt->cl;

	if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
	unsigned long flags = 0;

	spin_lock_irqsave(&client->lock, flags);
	if (--client->pkt_cnt == 0)
	del_timer(&client->timer);
	else
	mod_timer(&client->timer, jiffies +
	msecs_to_jiffies(client->timeout_ms));
	spin_unlock_irqrestore(&client->lock, flags);
	}

	dma_sync_single_for_cpu(client->chan->mbox->dev, pkt->pa_base,
	pkt->cmd_buf_size, DMA_TO_DEVICE);
	if (cb->cb) {
	data.data = cb->data;
	cb->cb(data);
	}
	}

	int cmdq_pkt_flush_async(struct cmdq_pkt *pkt, cmdq_async_flush_cb cb,
	void *data)
	{
	int err;
	unsigned long flags = 0;
	struct cmdq_client client = (struct cmdq_client )pkt->cl;

	pkt->cb.cb = cb;
	pkt->cb.data = data;
	pkt->async_cb.cb = cmdq_pkt_flush_async_cb;
	pkt->async_cb.data = pkt;

	dma_sync_single_for_device(client->chan->mbox->dev, pkt->pa_base,
	pkt->cmd_buf_size, DMA_TO_DEVICE);

	if (client->timeout_ms != CMDQ_NO_TIMEOUT) {
	spin_lock_irqsave(&client->lock, flags);
	if (client->pkt_cnt++ == 0)
	mod_timer(&client->timer, jiffies +
	msecs_to_jiffies(client->timeout_ms));
	spin_unlock_irqrestore(&client->lock, flags);
	}

	err = mbox_send_message(client->chan, pkt);
	if (err < 0)
	return err;
	/* We can send next packet immediately, so just call txdone. */
	mbox_client_txdone(client->chan, 0);

	return 0;
	}
	EXPORT_SYMBOL(cmdq_pkt_flush_async);

	struct cmdq_flush_completion {
	struct completion cmplt;
	bool err;
	};

	static void cmdq_pkt_flush_cb(struct cmdq_cb_data data)
	{
	struct cmdq_flush_completion *cmplt;

	cmplt = (struct cmdq_flush_completion *)data.data;
	if (data.sta != CMDQ_CB_NORMAL)
	cmplt->err = true;
	else
	cmplt->err = false;
	complete(&cmplt->cmplt);
	}

	int cmdq_pkt_flush(struct cmdq_pkt *pkt)
	{
	struct cmdq_flush_completion cmplt;
	int err;

	init_completion(&cmplt.cmplt);
	err = cmdq_pkt_flush_async(pkt, cmdq_pkt_flush_cb, &cmplt);
	if (err < 0)
	return err;
	wait_for_completion(&cmplt.cmplt);

	return cmplt.err ? -EFAULT : 0;
	}
	EXPORT_SYMBOL(cmdq_pkt_flush);

	MODULE_LICENSE("GPL v2");