Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 601 insertions, 0 deletions

diff --git a/sound/pci/mixart/mixart_core.c b/sound/pci/mixart/mixart_core.c
new file mode 100644
index 000000000..5a956f8bf
--- /dev/null
+++ b/sound/pci/mixart/mixart_core.c
@@ -0,0 +1,601 @@
+/*
+ * Driver for Digigram miXart soundcards
+ *
+ * low level interface with interrupt handling and mail box implementation
+ *
+ * Copyright (c) 2003 by Digigram <alsa@digigram.com>
+ *
+ *   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.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/interrupt.h>
+#include <linux/mutex.h>
+#include <linux/pci.h>
+#include <linux/io.h>
+
+#include <sound/core.h>
+#include "mixart.h"
+#include "mixart_hwdep.h"
+#include "mixart_core.h"
+
+
+#define MSG_TIMEOUT_JIFFIES         (400 * HZ) / 1000 /* 400 ms */
+
+#define MSG_DESCRIPTOR_SIZE         0x24
+#define MSG_HEADER_SIZE             (MSG_DESCRIPTOR_SIZE + 4)
+
+#define MSG_DEFAULT_SIZE            512
+
+#define MSG_TYPE_MASK               0x00000003    /* mask for following types */
+#define MSG_TYPE_NOTIFY             0             /* embedded -> driver (only notification, do not get_msg() !) */
+#define MSG_TYPE_COMMAND            1             /* driver <-> embedded (a command has no answer) */
+#define MSG_TYPE_REQUEST            2             /* driver -> embedded (request will get an answer back) */
+#define MSG_TYPE_ANSWER             3             /* embedded -> driver */
+#define MSG_CANCEL_NOTIFY_MASK      0x80000000    /* this bit is set for a notification that has been canceled */
+
+
+static int retrieve_msg_frame(struct mixart_mgr *mgr, u32 *msg_frame)
+{
+	/* read the message frame fifo */
+	u32 headptr, tailptr;
+
+	tailptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_POST_TAIL));
+	headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_POST_HEAD));
+
+	if (tailptr == headptr)
+		return 0; /* no message posted */
+
+	if (tailptr < MSG_OUTBOUND_POST_STACK)
+		return 0; /* error */
+	if (tailptr >= MSG_OUTBOUND_POST_STACK + MSG_BOUND_STACK_SIZE)
+		return 0; /* error */
+
+	*msg_frame = readl_be(MIXART_MEM(mgr, tailptr));
+
+	/* increment the tail index */
+	tailptr += 4;
+	if( tailptr >= (MSG_OUTBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
+		tailptr = MSG_OUTBOUND_POST_STACK;
+	writel_be(tailptr, MIXART_MEM(mgr, MSG_OUTBOUND_POST_TAIL));
+
+	return 1;
+}
+
+static int get_msg(struct mixart_mgr *mgr, struct mixart_msg *resp,
+		   u32 msg_frame_address )
+{
+	u32  headptr;
+	u32  size;
+	int  err;
+#ifndef __BIG_ENDIAN
+	unsigned int i;
+#endif
+
+	err = 0;
+
+	/* copy message descriptor from miXart to driver */
+	size                =  readl_be(MIXART_MEM(mgr, msg_frame_address));       /* size of descriptor + response */
+	resp->message_id    =  readl_be(MIXART_MEM(mgr, msg_frame_address + 4));   /* dwMessageID */
+	resp->uid.object_id =  readl_be(MIXART_MEM(mgr, msg_frame_address + 8));   /* uidDest */
+	resp->uid.desc      =  readl_be(MIXART_MEM(mgr, msg_frame_address + 12));  /* */
+
+	if( (size < MSG_DESCRIPTOR_SIZE) || (resp->size < (size - MSG_DESCRIPTOR_SIZE))) {
+		err = -EINVAL;
+		dev_err(&mgr->pci->dev,
+			"problem with response size = %d\n", size);
+		goto _clean_exit;
+	}
+	size -= MSG_DESCRIPTOR_SIZE;
+
+	memcpy_fromio(resp->data, MIXART_MEM(mgr, msg_frame_address + MSG_HEADER_SIZE ), size);
+	resp->size = size;
+
+	/* swap if necessary */
+#ifndef __BIG_ENDIAN
+	size /= 4; /* u32 size */
+	for(i=0; i < size; i++) {
+		((u32*)resp->data)[i] = be32_to_cpu(((__be32*)resp->data)[i]);
+	}
+#endif
+
+	/*
+	 * free message frame address
+	 */
+	headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
+
+	if( (headptr < MSG_OUTBOUND_FREE_STACK) || ( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
+		err = -EINVAL;
+		goto _clean_exit;
+	}
+
+	/* give address back to outbound fifo */
+	writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
+
+	/* increment the outbound free head */
+	headptr += 4;
+	if( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
+		headptr = MSG_OUTBOUND_FREE_STACK;
+
+	writel_be(headptr, MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));
+
+ _clean_exit:
+	return err;
+}
+
+
+/*
+ * send a message to miXart. return: the msg_frame used for this message
+ */
+/* call with mgr->msg_lock held! */
+static int send_msg( struct mixart_mgr *mgr,
+		     struct mixart_msg *msg,
+		     int max_answersize,
+		     int mark_pending,
+		     u32 *msg_event)
+{
+	u32 headptr, tailptr;
+	u32 msg_frame_address;
+	int i;
+
+	if (snd_BUG_ON(msg->size % 4))
+		return -EINVAL;
+
+	/* get message frame address */
+	tailptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
+	headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_HEAD));
+
+	if (tailptr == headptr) {
+		dev_err(&mgr->pci->dev, "error: no message frame available\n");
+		return -EBUSY;
+	}
+
+	if( (tailptr < MSG_INBOUND_FREE_STACK) || (tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {
+		return -EINVAL;
+	}
+
+	msg_frame_address = readl_be(MIXART_MEM(mgr, tailptr));
+	writel(0, MIXART_MEM(mgr, tailptr)); /* set address to zero on this fifo position */
+
+	/* increment the inbound free tail */
+	tailptr += 4;
+	if( tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )
+		tailptr = MSG_INBOUND_FREE_STACK;
+
+	writel_be(tailptr, MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));
+
+	/* TODO : use memcpy_toio() with intermediate buffer to copy the message */
+
+	/* copy message descriptor to card memory */
+	writel_be( msg->size + MSG_DESCRIPTOR_SIZE,      MIXART_MEM(mgr, msg_frame_address) );      /* size of descriptor + request */
+	writel_be( msg->message_id ,                     MIXART_MEM(mgr, msg_frame_address + 4) );  /* dwMessageID */
+	writel_be( msg->uid.object_id,                   MIXART_MEM(mgr, msg_frame_address + 8) );  /* uidDest */
+	writel_be( msg->uid.desc,                        MIXART_MEM(mgr, msg_frame_address + 12) ); /* */
+	writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 16) ); /* SizeHeader */
+	writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 20) ); /* OffsetDLL_T16 */
+	writel_be( msg->size,                            MIXART_MEM(mgr, msg_frame_address + 24) ); /* SizeDLL_T16 */
+	writel_be( MSG_DESCRIPTOR_SIZE,                  MIXART_MEM(mgr, msg_frame_address + 28) ); /* OffsetDLL_DRV */
+	writel_be( 0,                                    MIXART_MEM(mgr, msg_frame_address + 32) ); /* SizeDLL_DRV */
+	writel_be( MSG_DESCRIPTOR_SIZE + max_answersize, MIXART_MEM(mgr, msg_frame_address + 36) ); /* dwExpectedAnswerSize */
+
+	/* copy message data to card memory */
+	for( i=0; i < msg->size; i+=4 ) {
+		writel_be( *(u32*)(msg->data + i), MIXART_MEM(mgr, MSG_HEADER_SIZE + msg_frame_address + i)  );
+	}
+
+	if( mark_pending ) {
+		if( *msg_event ) {
+			/* the pending event is the notification we wait for ! */
+			mgr->pending_event = *msg_event;
+		}
+		else {
+			/* the pending event is the answer we wait for (same address than the request)! */
+			mgr->pending_event = msg_frame_address;
+
+			/* copy address back to caller */
+			*msg_event = msg_frame_address;
+		}
+	}
+
+	/* mark the frame as a request (will have an answer) */
+	msg_frame_address |= MSG_TYPE_REQUEST;
+
+	/* post the frame */
+	headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
+
+	if( (headptr < MSG_INBOUND_POST_STACK) || (headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE))) {
+		return -EINVAL;
+	}
+
+	writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));
+
+	/* increment the inbound post head */
+	headptr += 4;
+	if( headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )
+		headptr = MSG_INBOUND_POST_STACK;
+
+	writel_be(headptr, MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));
+
+	return 0;
+}
+
+
+int snd_mixart_send_msg(struct mixart_mgr *mgr, struct mixart_msg *request, int max_resp_size, void *resp_data)
+{
+	struct mixart_msg resp;
+	u32 msg_frame = 0; /* set to 0, so it's no notification to wait for, but the answer */
+	int err;
+	wait_queue_entry_t wait;
+	long timeout;
+
+	init_waitqueue_entry(&wait, current);
+
+	mutex_lock(&mgr->msg_lock);
+	/* send the message */
+	err = send_msg(mgr, request, max_resp_size, 1, &msg_frame);  /* send and mark the answer pending */
+	if (err) {
+		mutex_unlock(&mgr->msg_lock);
+		return err;
+	}
+
+	set_current_state(TASK_UNINTERRUPTIBLE);
+	add_wait_queue(&mgr->msg_sleep, &wait);
+	mutex_unlock(&mgr->msg_lock);
+	timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
+	remove_wait_queue(&mgr->msg_sleep, &wait);
+
+	if (! timeout) {
+		/* error - no ack */
+		dev_err(&mgr->pci->dev,
+			"error: no response on msg %x\n", msg_frame);
+		return -EIO;
+	}
+
+	/* retrieve the answer into the same struct mixart_msg */
+	resp.message_id = 0;
+	resp.uid = (struct mixart_uid){0,0};
+	resp.data = resp_data;
+	resp.size = max_resp_size;
+
+	mutex_lock(&mgr->msg_lock);
+	err = get_msg(mgr, &resp, msg_frame);
+	mutex_unlock(&mgr->msg_lock);
+
+	if( request->message_id != resp.message_id )
+		dev_err(&mgr->pci->dev, "RESPONSE ERROR!\n");
+
+	return err;
+}
+
+
+int snd_mixart_send_msg_wait_notif(struct mixart_mgr *mgr,
+				   struct mixart_msg *request, u32 notif_event)
+{
+	int err;
+	wait_queue_entry_t wait;
+	long timeout;
+
+	if (snd_BUG_ON(!notif_event))
+		return -EINVAL;
+	if (snd_BUG_ON((notif_event & MSG_TYPE_MASK) != MSG_TYPE_NOTIFY))
+		return -EINVAL;
+	if (snd_BUG_ON(notif_event & MSG_CANCEL_NOTIFY_MASK))
+		return -EINVAL;
+
+	init_waitqueue_entry(&wait, current);
+
+	mutex_lock(&mgr->msg_lock);
+	/* send the message */
+	err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 1, &notif_event);  /* send and mark the notification event pending */
+	if(err) {
+		mutex_unlock(&mgr->msg_lock);
+		return err;
+	}
+
+	set_current_state(TASK_UNINTERRUPTIBLE);
+	add_wait_queue(&mgr->msg_sleep, &wait);
+	mutex_unlock(&mgr->msg_lock);
+	timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
+	remove_wait_queue(&mgr->msg_sleep, &wait);
+
+	if (! timeout) {
+		/* error - no ack */
+		dev_err(&mgr->pci->dev,
+			"error: notification %x not received\n", notif_event);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+
+int snd_mixart_send_msg_nonblock(struct mixart_mgr *mgr, struct mixart_msg *request)
+{
+	u32 message_frame;
+	int err;
+
+	/* just send the message (do not mark it as a pending one) */
+	mutex_lock(&mgr->msg_lock);
+	err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 0, &message_frame);
+	mutex_unlock(&mgr->msg_lock);
+
+	/* the answer will be handled by snd_struct mixart_msgasklet()  */
+	atomic_inc(&mgr->msg_processed);
+
+	return err;
+}
+
+
+/* common buffer of interrupt to send/receive messages */
+static u32 mixart_msg_data[MSG_DEFAULT_SIZE / 4];
+
+
+static void snd_mixart_process_msg(struct mixart_mgr *mgr)
+{
+	struct mixart_msg resp;
+	u32 msg, addr, type;
+	int err;
+
+	while (mgr->msg_fifo_readptr != mgr->msg_fifo_writeptr) {
+		msg = mgr->msg_fifo[mgr->msg_fifo_readptr];
+		mgr->msg_fifo_readptr++;
+		mgr->msg_fifo_readptr %= MSG_FIFO_SIZE;
+
+		/* process the message ... */
+		addr = msg & ~MSG_TYPE_MASK;
+		type = msg & MSG_TYPE_MASK;
+
+		switch (type) {
+		case MSG_TYPE_ANSWER:
+			/* answer to a message on that we did not wait for (send_msg_nonblock) */
+			resp.message_id = 0;
+			resp.data = mixart_msg_data;
+			resp.size = sizeof(mixart_msg_data);
+			err = get_msg(mgr, &resp, addr);
+			if( err < 0 ) {
+				dev_err(&mgr->pci->dev,
+					"error(%d) reading mf %x\n",
+					err, msg);
+				break;
+			}
+
+			switch(resp.message_id) {
+			case MSG_STREAM_START_INPUT_STAGE_PACKET:
+			case MSG_STREAM_START_OUTPUT_STAGE_PACKET:
+			case MSG_STREAM_STOP_INPUT_STAGE_PACKET:
+			case MSG_STREAM_STOP_OUTPUT_STAGE_PACKET:
+				if(mixart_msg_data[0])
+					dev_err(&mgr->pci->dev,
+						"error MSG_STREAM_ST***_***PUT_STAGE_PACKET status=%x\n",
+						mixart_msg_data[0]);
+				break;
+			default:
+				dev_dbg(&mgr->pci->dev,
+					"received mf(%x) : msg_id(%x) uid(%x, %x) size(%zd)\n",
+					   msg, resp.message_id, resp.uid.object_id, resp.uid.desc, resp.size);
+				break;
+			}
+			break;
+ 		case MSG_TYPE_NOTIFY:
+			/* msg contains no address ! do not get_msg() ! */
+		case MSG_TYPE_COMMAND:
+			/* get_msg() necessary */
+		default:
+			dev_err(&mgr->pci->dev,
+				"doesn't know what to do with message %x\n",
+				msg);
+		} /* switch type */
+
+		/* decrement counter */
+		atomic_dec(&mgr->msg_processed);
+
+	} /* while there is a msg in fifo */
+}
+
+
+irqreturn_t snd_mixart_interrupt(int irq, void *dev_id)
+{
+	struct mixart_mgr *mgr = dev_id;
+	u32 it_reg;
+
+	it_reg = readl_le(MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET));
+	if( !(it_reg & MIXART_OIDI) ) {
+		/* this device did not cause the interrupt */
+		return IRQ_NONE;
+	}
+
+	/* mask all interrupts */
+	writel_le(MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG(mgr, MIXART_PCI_OMIMR_OFFSET));
+
+	/* outdoorbell register clear */
+	it_reg = readl(MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
+	writel(it_reg, MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));
+
+	/* clear interrupt */
+	writel_le( MIXART_OIDI, MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET) );
+
+	return IRQ_WAKE_THREAD;
+}
+
+irqreturn_t snd_mixart_threaded_irq(int irq, void *dev_id)
+{
+	struct mixart_mgr *mgr = dev_id;
+	int err;
+	struct mixart_msg resp;
+	u32 msg;
+
+	mutex_lock(&mgr->lock);
+	/* process interrupt */
+	while (retrieve_msg_frame(mgr, &msg)) {
+
+		switch (msg & MSG_TYPE_MASK) {
+		case MSG_TYPE_COMMAND:
+			resp.message_id = 0;
+			resp.data = mixart_msg_data;
+			resp.size = sizeof(mixart_msg_data);
+			err = get_msg(mgr, &resp, msg & ~MSG_TYPE_MASK);
+			if( err < 0 ) {
+				dev_err(&mgr->pci->dev,
+					"interrupt: error(%d) reading mf %x\n",
+					err, msg);
+				break;
+			}
+
+			if(resp.message_id == MSG_SERVICES_TIMER_NOTIFY) {
+				int i;
+				struct mixart_timer_notify *notify;
+				notify = (struct mixart_timer_notify *)mixart_msg_data;
+
+				for(i=0; i<notify->stream_count; i++) {
+
+					u32 buffer_id = notify->streams[i].buffer_id;
+					unsigned int chip_number =  (buffer_id & MIXART_NOTIFY_CARD_MASK) >> MIXART_NOTIFY_CARD_OFFSET; /* card0 to 3 */
+					unsigned int pcm_number  =  (buffer_id & MIXART_NOTIFY_PCM_MASK ) >> MIXART_NOTIFY_PCM_OFFSET;  /* pcm0 to 3  */
+					unsigned int sub_number  =   buffer_id & MIXART_NOTIFY_SUBS_MASK;             /* 0 to MIXART_PLAYBACK_STREAMS */
+					unsigned int is_capture  = ((buffer_id & MIXART_NOTIFY_CAPT_MASK) != 0);      /* playback == 0 / capture == 1 */
+
+					struct snd_mixart *chip  = mgr->chip[chip_number];
+					struct mixart_stream *stream;
+
+					if ((chip_number >= mgr->num_cards) || (pcm_number >= MIXART_PCM_TOTAL) || (sub_number >= MIXART_PLAYBACK_STREAMS)) {
+						dev_err(&mgr->pci->dev,
+							"error MSG_SERVICES_TIMER_NOTIFY buffer_id (%x) pos(%d)\n",
+							   buffer_id, notify->streams[i].sample_pos_low_part);
+						break;
+					}
+
+					if (is_capture)
+						stream = &chip->capture_stream[pcm_number];
+					else
+						stream = &chip->playback_stream[pcm_number][sub_number];
+
+					if (stream->substream && (stream->status == MIXART_STREAM_STATUS_RUNNING)) {
+						struct snd_pcm_runtime *runtime = stream->substream->runtime;
+						int elapsed = 0;
+						u64 sample_count = ((u64)notify->streams[i].sample_pos_high_part) << 32;
+						sample_count |= notify->streams[i].sample_pos_low_part;
+
+						while (1) {
+							u64 new_elapse_pos = stream->abs_period_elapsed +  runtime->period_size;
+
+							if (new_elapse_pos > sample_count) {
+								break; /* while */
+							}
+							else {
+								elapsed = 1;
+								stream->buf_periods++;
+								if (stream->buf_periods >= runtime->periods)
+									stream->buf_periods = 0;
+
+								stream->abs_period_elapsed = new_elapse_pos;
+							}
+						}
+						stream->buf_period_frag = (u32)( sample_count - stream->abs_period_elapsed );
+
+						if(elapsed) {
+							mutex_unlock(&mgr->lock);
+							snd_pcm_period_elapsed(stream->substream);
+							mutex_lock(&mgr->lock);
+						}
+					}
+				}
+				break;
+			}
+			if(resp.message_id == MSG_SERVICES_REPORT_TRACES) {
+				if(resp.size > 1) {
+#ifndef __BIG_ENDIAN
+					/* Traces are text: the swapped msg_data has to be swapped back ! */
+					int i;
+					for(i=0; i<(resp.size/4); i++) {
+						((__be32*)mixart_msg_data)[i] = cpu_to_be32((mixart_msg_data)[i]);
+					}
+#endif
+					((char*)mixart_msg_data)[resp.size - 1] = 0;
+					dev_dbg(&mgr->pci->dev,
+						"MIXART TRACE : %s\n",
+						(char *)mixart_msg_data);
+				}
+				break;
+			}
+
+			dev_dbg(&mgr->pci->dev, "command %x not handled\n",
+				resp.message_id);
+			break;
+
+		case MSG_TYPE_NOTIFY:
+			if(msg & MSG_CANCEL_NOTIFY_MASK) {
+				msg &= ~MSG_CANCEL_NOTIFY_MASK;
+				dev_err(&mgr->pci->dev,
+					"canceled notification %x !\n", msg);
+			}
+			/* fall through */
+		case MSG_TYPE_ANSWER:
+			/* answer or notification to a message we are waiting for*/
+			mutex_lock(&mgr->msg_lock);
+			if( (msg & ~MSG_TYPE_MASK) == mgr->pending_event ) {
+				wake_up(&mgr->msg_sleep);
+				mgr->pending_event = 0;
+			}
+			/* answer to a message we did't want to wait for */
+			else {
+				mgr->msg_fifo[mgr->msg_fifo_writeptr] = msg;
+				mgr->msg_fifo_writeptr++;
+				mgr->msg_fifo_writeptr %= MSG_FIFO_SIZE;
+				snd_mixart_process_msg(mgr);
+			}
+			mutex_unlock(&mgr->msg_lock);
+			break;
+		case MSG_TYPE_REQUEST:
+		default:
+			dev_dbg(&mgr->pci->dev,
+				"interrupt received request %x\n", msg);
+			/* TODO : are there things to do here ? */
+			break;
+		} /* switch on msg type */
+	} /* while there are msgs */
+
+	/* allow interrupt again */
+	writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
+
+	mutex_unlock(&mgr->lock);
+
+	return IRQ_HANDLED;
+}
+
+
+void snd_mixart_init_mailbox(struct mixart_mgr *mgr)
+{
+	writel( 0, MIXART_MEM( mgr, MSG_HOST_RSC_PROTECTION ) );
+	writel( 0, MIXART_MEM( mgr, MSG_AGENT_RSC_PROTECTION ) );
+
+	/* allow outbound messagebox to generate interrupts */
+	if(mgr->irq >= 0) {
+		writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
+	}
+	return;
+}
+
+void snd_mixart_exit_mailbox(struct mixart_mgr *mgr)
+{
+	/* no more interrupts on outbound messagebox */
+	writel_le( MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));
+	return;
+}
+
+void snd_mixart_reset_board(struct mixart_mgr *mgr)
+{
+	/* reset miXart */
+	writel_be( 1, MIXART_REG(mgr, MIXART_BA1_BRUTAL_RESET_OFFSET) );
+	return;
+}