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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [sound/] [pci/] [mixart/] [mixart_core.c] - Blame information for rev 3

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/*
 * 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 <sound/driver.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>
 
#include <asm/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 */
 
        snd_assert( tailptr >= MSG_OUTBOUND_POST_STACK, return 0); /* error */
        snd_assert( 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 )
{
        unsigned long flags;
        u32  headptr;
        u32  size;
        int  err;
#ifndef __BIG_ENDIAN
        unsigned int i;
#endif
 
        spin_lock_irqsave(&mgr->msg_lock, flags);
        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;
                snd_printk(KERN_ERR "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(((u32*)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:
        spin_unlock_irqrestore(&mgr->msg_lock, flags);
 
        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 err, i;
 
        snd_assert(msg->size % 4 == 0, return -EINVAL);
 
        err = 0;
 
        /* 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) {
                snd_printk(KERN_ERR "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_t wait;
        long timeout;
 
        mutex_lock(&mgr->msg_mutex);
 
        init_waitqueue_entry(&wait, current);
 
        spin_lock_irq(&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) {
                spin_unlock_irq(&mgr->msg_lock);
                mutex_unlock(&mgr->msg_mutex);
                return err;
        }
 
        set_current_state(TASK_UNINTERRUPTIBLE);
        add_wait_queue(&mgr->msg_sleep, &wait);
        spin_unlock_irq(&mgr->msg_lock);
        timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
        remove_wait_queue(&mgr->msg_sleep, &wait);
 
        if (! timeout) {
                /* error - no ack */
                mutex_unlock(&mgr->msg_mutex);
                snd_printk(KERN_ERR "error: no reponse 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;
 
        err = get_msg(mgr, &resp, msg_frame);
 
        if( request->message_id != resp.message_id )
                snd_printk(KERN_ERR "REPONSE ERROR!\n");
 
        mutex_unlock(&mgr->msg_mutex);
        return err;
}
 
 
int snd_mixart_send_msg_wait_notif(struct mixart_mgr *mgr,
                                   struct mixart_msg *request, u32 notif_event)
{
        int err;
        wait_queue_t wait;
        long timeout;
 
        snd_assert(notif_event != 0, return -EINVAL);
        snd_assert((notif_event & MSG_TYPE_MASK) == MSG_TYPE_NOTIFY, return -EINVAL);
        snd_assert((notif_event & MSG_CANCEL_NOTIFY_MASK) == 0, return -EINVAL);
 
        mutex_lock(&mgr->msg_mutex);
 
        init_waitqueue_entry(&wait, current);
 
        spin_lock_irq(&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) {
                spin_unlock_irq(&mgr->msg_lock);
                mutex_unlock(&mgr->msg_mutex);
                return err;
        }
 
        set_current_state(TASK_UNINTERRUPTIBLE);
        add_wait_queue(&mgr->msg_sleep, &wait);
        spin_unlock_irq(&mgr->msg_lock);
        timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);
        remove_wait_queue(&mgr->msg_sleep, &wait);
 
        if (! timeout) {
                /* error - no ack */
                mutex_unlock(&mgr->msg_mutex);
                snd_printk(KERN_ERR "error: notification %x not received\n", notif_event);
                return -EIO;
        }
 
        mutex_unlock(&mgr->msg_mutex);
        return 0;
}
 
 
int snd_mixart_send_msg_nonblock(struct mixart_mgr *mgr, struct mixart_msg *request)
{
        u32 message_frame;
        unsigned long flags;
        int err;
 
        /* just send the message (do not mark it as a pending one) */
        spin_lock_irqsave(&mgr->msg_lock, flags);
        err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 0, &message_frame);
        spin_unlock_irqrestore(&mgr->msg_lock, flags);
 
        /* the answer will be handled by snd_struct mixart_msgasklet()  */
        atomic_inc(&mgr->msg_processed);
 
        return err;
}
 
 
/* common buffer of tasklet and interrupt to send/receive messages */
static u32 mixart_msg_data[MSG_DEFAULT_SIZE / 4];
 
 
void snd_mixart_msg_tasklet(unsigned long arg)
{
        struct mixart_mgr *mgr = ( struct mixart_mgr*)(arg);
        struct mixart_msg resp;
        u32 msg, addr, type;
        int err;
 
        spin_lock(&mgr->lock);
 
        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 ) {
                                snd_printk(KERN_ERR "tasklet: 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])
                                        snd_printk(KERN_ERR "tasklet : error MSG_STREAM_ST***_***PUT_STAGE_PACKET status=%x\n", mixart_msg_data[0]);
                                break;
                        default:
                                snd_printdd("tasklet 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:
                        snd_printk(KERN_ERR "tasklet 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 */
 
        spin_unlock(&mgr->lock);
}
 
 
irqreturn_t snd_mixart_interrupt(int irq, void *dev_id)
{
        struct mixart_mgr *mgr = dev_id;
        int err;
        struct mixart_msg resp;
 
        u32 msg;
        u32 it_reg;
 
        spin_lock(&mgr->lock);
 
        it_reg = readl_le(MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET));
        if( !(it_reg & MIXART_OIDI) ) {
                /* this device did not cause the interrupt */
                spin_unlock(&mgr->lock);
                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) );
 
        /* 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 ) {
                                snd_printk(KERN_ERR "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)) {
                                                snd_printk(KERN_ERR "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) {
                                                        spin_unlock(&mgr->lock);
                                                        snd_pcm_period_elapsed(stream->substream);
                                                        spin_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++) {
                                                (mixart_msg_data)[i] = cpu_to_be32((mixart_msg_data)[i]);
                                        }
#endif
                                        ((char*)mixart_msg_data)[resp.size - 1] = 0;
                                        snd_printdd("MIXART TRACE : %s\n", (char*)mixart_msg_data);
                                }
                                break;
                        }
 
                        snd_printdd("command %x not handled\n", resp.message_id);
                        break;
 
                case MSG_TYPE_NOTIFY:
                        if(msg & MSG_CANCEL_NOTIFY_MASK) {
                                msg &= ~MSG_CANCEL_NOTIFY_MASK;
                                snd_printk(KERN_ERR "canceled notification %x !\n", msg);
                        }
                        /* no break, continue ! */
                case MSG_TYPE_ANSWER:
                        /* answer or notification to a message we are waiting for*/
                        spin_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;
                                tasklet_hi_schedule(&mgr->msg_taskq);
                        }
                        spin_unlock(&mgr->msg_lock);
                        break;
                case MSG_TYPE_REQUEST:
                default:
                        snd_printdd("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));
 
        spin_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;
}

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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [sound/] [pci/] [mixart/] [mixart_core.c] - Blame information for rev 3

Line No.	Rev	Author	Line
1	3	xianfeng	`/*`
2			`* Driver for Digigram miXart soundcards`
3			`*`
4			`* low level interface with interrupt handling and mail box implementation`
5			`*`
6			`* Copyright (c) 2003 by Digigram <alsa@digigram.com>`
7			`*`
8			`* This program is free software; you can redistribute it and/or modify`
9			`* it under the terms of the GNU General Public License as published by`
10			`* the Free Software Foundation; either version 2 of the License, or`
11			`* (at your option) any later version.`
12			`*`
13			`* This program is distributed in the hope that it will be useful,`
14			`* but WITHOUT ANY WARRANTY; without even the implied warranty of`
15			`* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
16			`* GNU General Public License for more details.`
17			`*`
18			`* You should have received a copy of the GNU General Public License`
19			`* along with this program; if not, write to the Free Software`
20			`* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA`
21			`*/`
22
23			`#include <sound/driver.h>`
24			`#include <linux/interrupt.h>`
25			`#include <linux/mutex.h>`
26
27			`#include <asm/io.h>`
28			`#include <sound/core.h>`
29			`#include "mixart.h"`
30			`#include "mixart_hwdep.h"`
31			`#include "mixart_core.h"`
32
33
34			`#define MSG_TIMEOUT_JIFFIES (400 * HZ) / 1000 /* 400 ms */`
35
36			`#define MSG_DESCRIPTOR_SIZE 0x24`
37			`#define MSG_HEADER_SIZE (MSG_DESCRIPTOR_SIZE + 4)`
38
39			`#define MSG_DEFAULT_SIZE 512`
40
41			`#define MSG_TYPE_MASK 0x00000003 /* mask for following types */`
42			`#define MSG_TYPE_NOTIFY 0 /* embedded -> driver (only notification, do not get_msg() !) */`
43			`#define MSG_TYPE_COMMAND 1 /* driver <-> embedded (a command has no answer) */`
44			`#define MSG_TYPE_REQUEST 2 /* driver -> embedded (request will get an answer back) */`
45			`#define MSG_TYPE_ANSWER 3 /* embedded -> driver */`
46			`#define MSG_CANCEL_NOTIFY_MASK 0x80000000 /* this bit is set for a notification that has been canceled */`
47
48
49			`static int retrieve_msg_frame(struct mixart_mgr mgr, u32 msg_frame)`
50			`{`
51			`/* read the message frame fifo */`
52			`u32 headptr, tailptr;`
53
54			`tailptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_POST_TAIL));`
55			`headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_POST_HEAD));`
56
57			`if (tailptr == headptr)`
58			`return 0; /* no message posted */`
59
60			`snd_assert( tailptr >= MSG_OUTBOUND_POST_STACK, return 0); /* error */`
61			`snd_assert( tailptr < (MSG_OUTBOUND_POST_STACK+MSG_BOUND_STACK_SIZE), return 0); /* error */`
62
63			`*msg_frame = readl_be(MIXART_MEM(mgr, tailptr));`
64
65			`/* increment the tail index */`
66			`tailptr += 4;`
67			`if( tailptr >= (MSG_OUTBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )`
68			`tailptr = MSG_OUTBOUND_POST_STACK;`
69			`writel_be(tailptr, MIXART_MEM(mgr, MSG_OUTBOUND_POST_TAIL));`
70
71			`return 1;`
72			`}`
73
74			`static int get_msg(struct mixart_mgr mgr, struct mixart_msg resp,`
75			`u32 msg_frame_address )`
76			`{`
77			`unsigned long flags;`
78			`u32 headptr;`
79			`u32 size;`
80			`int err;`
81			`#ifndef __BIG_ENDIAN`
82			`unsigned int i;`
83			`#endif`
84
85			`spin_lock_irqsave(&mgr->msg_lock, flags);`
86			`err = 0;`
87
88			`/* copy message descriptor from miXart to driver */`
89			`size = readl_be(MIXART_MEM(mgr, msg_frame_address)); /* size of descriptor + response */`
90			`resp->message_id = readl_be(MIXART_MEM(mgr, msg_frame_address + 4)); /* dwMessageID */`
91			`resp->uid.object_id = readl_be(MIXART_MEM(mgr, msg_frame_address + 8)); /* uidDest */`
92			`resp->uid.desc = readl_be(MIXART_MEM(mgr, msg_frame_address + 12)); /* */`
93
94			`if( (size < MSG_DESCRIPTOR_SIZE) \|\| (resp->size < (size - MSG_DESCRIPTOR_SIZE))) {`
95			`err = -EINVAL;`
96			`snd_printk(KERN_ERR "problem with response size = %d\n", size);`
97			`goto _clean_exit;`
98			`}`
99			`size -= MSG_DESCRIPTOR_SIZE;`
100
101			`memcpy_fromio(resp->data, MIXART_MEM(mgr, msg_frame_address + MSG_HEADER_SIZE ), size);`
102			`resp->size = size;`
103
104			`/* swap if necessary */`
105			`#ifndef __BIG_ENDIAN`
106			`size /= 4; /* u32 size */`
107			`for(i=0; i < size; i++) {`
108			`((u32)resp->data)[i] = be32_to_cpu(((u32)resp->data)[i]);`
109			`}`
110			`#endif`
111
112			`/*`
113			`* free message frame address`
114			`*/`
115			`headptr = readl_be(MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));`
116
117			`if( (headptr < MSG_OUTBOUND_FREE_STACK) \|\| ( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {`
118			`err = -EINVAL;`
119			`goto _clean_exit;`
120			`}`
121
122			`/* give address back to outbound fifo */`
123			`writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));`
124
125			`/* increment the outbound free head */`
126			`headptr += 4;`
127			`if( headptr >= (MSG_OUTBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )`
128			`headptr = MSG_OUTBOUND_FREE_STACK;`
129
130			`writel_be(headptr, MIXART_MEM(mgr, MSG_OUTBOUND_FREE_HEAD));`
131
132			`_clean_exit:`
133			`spin_unlock_irqrestore(&mgr->msg_lock, flags);`
134
135			`return err;`
136			`}`
137
138
139			`/*`
140			`* send a message to miXart. return: the msg_frame used for this message`
141			`*/`
142			`/* call with mgr->msg_lock held! */`
143			`static int send_msg( struct mixart_mgr *mgr,`
144			`struct mixart_msg *msg,`
145			`int max_answersize,`
146			`int mark_pending,`
147			`u32 *msg_event)`
148			`{`
149			`u32 headptr, tailptr;`
150			`u32 msg_frame_address;`
151			`int err, i;`
152
153			`snd_assert(msg->size % 4 == 0, return -EINVAL);`
154
155			`err = 0;`
156
157			`/* get message frame address */`
158			`tailptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));`
159			`headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_FREE_HEAD));`
160
161			`if (tailptr == headptr) {`
162			`snd_printk(KERN_ERR "error: no message frame available\n");`
163			`return -EBUSY;`
164			`}`
165
166			`if( (tailptr < MSG_INBOUND_FREE_STACK) \|\| (tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE))) {`
167			`return -EINVAL;`
168			`}`
169
170			`msg_frame_address = readl_be(MIXART_MEM(mgr, tailptr));`
171			`writel(0, MIXART_MEM(mgr, tailptr)); /* set address to zero on this fifo position */`
172
173			`/* increment the inbound free tail */`
174			`tailptr += 4;`
175			`if( tailptr >= (MSG_INBOUND_FREE_STACK+MSG_BOUND_STACK_SIZE) )`
176			`tailptr = MSG_INBOUND_FREE_STACK;`
177
178			`writel_be(tailptr, MIXART_MEM(mgr, MSG_INBOUND_FREE_TAIL));`
179
180			`/* TODO : use memcpy_toio() with intermediate buffer to copy the message */`
181
182			`/* copy message descriptor to card memory */`
183			`writel_be( msg->size + MSG_DESCRIPTOR_SIZE, MIXART_MEM(mgr, msg_frame_address) ); /* size of descriptor + request */`
184			`writel_be( msg->message_id , MIXART_MEM(mgr, msg_frame_address + 4) ); /* dwMessageID */`
185			`writel_be( msg->uid.object_id, MIXART_MEM(mgr, msg_frame_address + 8) ); /* uidDest */`
186			`writel_be( msg->uid.desc, MIXART_MEM(mgr, msg_frame_address + 12) ); /* */`
187			`writel_be( MSG_DESCRIPTOR_SIZE, MIXART_MEM(mgr, msg_frame_address + 16) ); /* SizeHeader */`
188			`writel_be( MSG_DESCRIPTOR_SIZE, MIXART_MEM(mgr, msg_frame_address + 20) ); /* OffsetDLL_T16 */`
189			`writel_be( msg->size, MIXART_MEM(mgr, msg_frame_address + 24) ); /* SizeDLL_T16 */`
190			`writel_be( MSG_DESCRIPTOR_SIZE, MIXART_MEM(mgr, msg_frame_address + 28) ); /* OffsetDLL_DRV */`
191			`writel_be( 0, MIXART_MEM(mgr, msg_frame_address + 32) ); /* SizeDLL_DRV */`
192			`writel_be( MSG_DESCRIPTOR_SIZE + max_answersize, MIXART_MEM(mgr, msg_frame_address + 36) ); /* dwExpectedAnswerSize */`
193
194			`/* copy message data to card memory */`
195			`for( i=0; i < msg->size; i+=4 ) {`
196			`writel_be( (u32)(msg->data + i), MIXART_MEM(mgr, MSG_HEADER_SIZE + msg_frame_address + i) );`
197			`}`
198
199			`if( mark_pending ) {`
200			`if( *msg_event ) {`
201			`/* the pending event is the notification we wait for ! */`
202			`mgr->pending_event = *msg_event;`
203			`}`
204			`else {`
205			`/* the pending event is the answer we wait for (same address than the request)! */`
206			`mgr->pending_event = msg_frame_address;`
207
208			`/* copy address back to caller */`
209			`*msg_event = msg_frame_address;`
210			`}`
211			`}`
212
213			`/* mark the frame as a request (will have an answer) */`
214			`msg_frame_address \|= MSG_TYPE_REQUEST;`
215
216			`/* post the frame */`
217			`headptr = readl_be(MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));`
218
219			`if( (headptr < MSG_INBOUND_POST_STACK) \|\| (headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE))) {`
220			`return -EINVAL;`
221			`}`
222
223			`writel_be(msg_frame_address, MIXART_MEM(mgr, headptr));`
224
225			`/* increment the inbound post head */`
226			`headptr += 4;`
227			`if( headptr >= (MSG_INBOUND_POST_STACK+MSG_BOUND_STACK_SIZE) )`
228			`headptr = MSG_INBOUND_POST_STACK;`
229
230			`writel_be(headptr, MIXART_MEM(mgr, MSG_INBOUND_POST_HEAD));`
231
232			`return 0;`
233			`}`
234
235
236			`int snd_mixart_send_msg(struct mixart_mgr mgr, struct mixart_msg request, int max_resp_size, void *resp_data)`
237			`{`
238			`struct mixart_msg resp;`
239			`u32 msg_frame = 0; /* set to 0, so it's no notification to wait for, but the answer */`
240			`int err;`
241			`wait_queue_t wait;`
242			`long timeout;`
243
244			`mutex_lock(&mgr->msg_mutex);`
245
246			`init_waitqueue_entry(&wait, current);`
247
248			`spin_lock_irq(&mgr->msg_lock);`
249			`/* send the message */`
250			`err = send_msg(mgr, request, max_resp_size, 1, &msg_frame); /* send and mark the answer pending */`
251			`if (err) {`
252			`spin_unlock_irq(&mgr->msg_lock);`
253			`mutex_unlock(&mgr->msg_mutex);`
254			`return err;`
255			`}`
256
257			`set_current_state(TASK_UNINTERRUPTIBLE);`
258			`add_wait_queue(&mgr->msg_sleep, &wait);`
259			`spin_unlock_irq(&mgr->msg_lock);`
260			`timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);`
261			`remove_wait_queue(&mgr->msg_sleep, &wait);`
262
263			`if (! timeout) {`
264			`/* error - no ack */`
265			`mutex_unlock(&mgr->msg_mutex);`
266			`snd_printk(KERN_ERR "error: no reponse on msg %x\n", msg_frame);`
267			`return -EIO;`
268			`}`
269
270			`/* retrieve the answer into the same struct mixart_msg */`
271			`resp.message_id = 0;`
272			`resp.uid = (struct mixart_uid){0,0};`
273			`resp.data = resp_data;`
274			`resp.size = max_resp_size;`
275
276			`err = get_msg(mgr, &resp, msg_frame);`
277
278			`if( request->message_id != resp.message_id )`
279			`snd_printk(KERN_ERR "REPONSE ERROR!\n");`
280
281			`mutex_unlock(&mgr->msg_mutex);`
282			`return err;`
283			`}`
284
285
286			`int snd_mixart_send_msg_wait_notif(struct mixart_mgr *mgr,`
287			`struct mixart_msg *request, u32 notif_event)`
288			`{`
289			`int err;`
290			`wait_queue_t wait;`
291			`long timeout;`
292
293			`snd_assert(notif_event != 0, return -EINVAL);`
294			`snd_assert((notif_event & MSG_TYPE_MASK) == MSG_TYPE_NOTIFY, return -EINVAL);`
295			`snd_assert((notif_event & MSG_CANCEL_NOTIFY_MASK) == 0, return -EINVAL);`
296
297			`mutex_lock(&mgr->msg_mutex);`
298
299			`init_waitqueue_entry(&wait, current);`
300
301			`spin_lock_irq(&mgr->msg_lock);`
302			`/* send the message */`
303			`err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 1, &notif_event); /* send and mark the notification event pending */`
304			`if(err) {`
305			`spin_unlock_irq(&mgr->msg_lock);`
306			`mutex_unlock(&mgr->msg_mutex);`
307			`return err;`
308			`}`
309
310			`set_current_state(TASK_UNINTERRUPTIBLE);`
311			`add_wait_queue(&mgr->msg_sleep, &wait);`
312			`spin_unlock_irq(&mgr->msg_lock);`
313			`timeout = schedule_timeout(MSG_TIMEOUT_JIFFIES);`
314			`remove_wait_queue(&mgr->msg_sleep, &wait);`
315
316			`if (! timeout) {`
317			`/* error - no ack */`
318			`mutex_unlock(&mgr->msg_mutex);`
319			`snd_printk(KERN_ERR "error: notification %x not received\n", notif_event);`
320			`return -EIO;`
321			`}`
322
323			`mutex_unlock(&mgr->msg_mutex);`
324			`return 0;`
325			`}`
326
327
328			`int snd_mixart_send_msg_nonblock(struct mixart_mgr mgr, struct mixart_msg request)`
329			`{`
330			`u32 message_frame;`
331			`unsigned long flags;`
332			`int err;`
333
334			`/* just send the message (do not mark it as a pending one) */`
335			`spin_lock_irqsave(&mgr->msg_lock, flags);`
336			`err = send_msg(mgr, request, MSG_DEFAULT_SIZE, 0, &message_frame);`
337			`spin_unlock_irqrestore(&mgr->msg_lock, flags);`
338
339			`/* the answer will be handled by snd_struct mixart_msgasklet() */`
340			`atomic_inc(&mgr->msg_processed);`
341
342			`return err;`
343			`}`
344
345
346			`/* common buffer of tasklet and interrupt to send/receive messages */`
347			`static u32 mixart_msg_data[MSG_DEFAULT_SIZE / 4];`
348
349
350			`void snd_mixart_msg_tasklet(unsigned long arg)`
351			`{`
352			`struct mixart_mgr mgr = ( struct mixart_mgr)(arg);`
353			`struct mixart_msg resp;`
354			`u32 msg, addr, type;`
355			`int err;`
356
357			`spin_lock(&mgr->lock);`
358
359			`while (mgr->msg_fifo_readptr != mgr->msg_fifo_writeptr) {`
360			`msg = mgr->msg_fifo[mgr->msg_fifo_readptr];`
361			`mgr->msg_fifo_readptr++;`
362			`mgr->msg_fifo_readptr %= MSG_FIFO_SIZE;`
363
364			`/* process the message ... */`
365			`addr = msg & ~MSG_TYPE_MASK;`
366			`type = msg & MSG_TYPE_MASK;`
367
368			`switch (type) {`
369			`case MSG_TYPE_ANSWER:`
370			`/* answer to a message on that we did not wait for (send_msg_nonblock) */`
371			`resp.message_id = 0;`
372			`resp.data = mixart_msg_data;`
373			`resp.size = sizeof(mixart_msg_data);`
374			`err = get_msg(mgr, &resp, addr);`
375			`if( err < 0 ) {`
376			`snd_printk(KERN_ERR "tasklet: error(%d) reading mf %x\n", err, msg);`
377			`break;`
378			`}`
379
380			`switch(resp.message_id) {`
381			`case MSG_STREAM_START_INPUT_STAGE_PACKET:`
382			`case MSG_STREAM_START_OUTPUT_STAGE_PACKET:`
383			`case MSG_STREAM_STOP_INPUT_STAGE_PACKET:`
384			`case MSG_STREAM_STOP_OUTPUT_STAGE_PACKET:`
385			`if(mixart_msg_data[0])`
386			`snd_printk(KERN_ERR "tasklet : error MSG_STREAM_ST*_*PUT_STAGE_PACKET status=%x\n", mixart_msg_data[0]);`
387			`break;`
388			`default:`
389			`snd_printdd("tasklet received mf(%x) : msg_id(%x) uid(%x, %x) size(%zd)\n",`
390			`msg, resp.message_id, resp.uid.object_id, resp.uid.desc, resp.size);`
391			`break;`
392			`}`
393			`break;`
394			`case MSG_TYPE_NOTIFY:`
395			`/* msg contains no address ! do not get_msg() ! */`
396			`case MSG_TYPE_COMMAND:`
397			`/* get_msg() necessary */`
398			`default:`
399			`snd_printk(KERN_ERR "tasklet doesn't know what to do with message %x\n", msg);`
400			`} /* switch type */`
401
402			`/* decrement counter */`
403			`atomic_dec(&mgr->msg_processed);`
404
405			`} /* while there is a msg in fifo */`
406
407			`spin_unlock(&mgr->lock);`
408			`}`
409
410
411			`irqreturn_t snd_mixart_interrupt(int irq, void *dev_id)`
412			`{`
413			`struct mixart_mgr *mgr = dev_id;`
414			`int err;`
415			`struct mixart_msg resp;`
416
417			`u32 msg;`
418			`u32 it_reg;`
419
420			`spin_lock(&mgr->lock);`
421
422			`it_reg = readl_le(MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET));`
423			`if( !(it_reg & MIXART_OIDI) ) {`
424			`/* this device did not cause the interrupt */`
425			`spin_unlock(&mgr->lock);`
426			`return IRQ_NONE;`
427			`}`
428
429			`/* mask all interrupts */`
430			`writel_le(MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG(mgr, MIXART_PCI_OMIMR_OFFSET));`
431
432			`/* outdoorbell register clear */`
433			`it_reg = readl(MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));`
434			`writel(it_reg, MIXART_REG(mgr, MIXART_PCI_ODBR_OFFSET));`
435
436			`/* clear interrupt */`
437			`writel_le( MIXART_OIDI, MIXART_REG(mgr, MIXART_PCI_OMISR_OFFSET) );`
438
439			`/* process interrupt */`
440			`while (retrieve_msg_frame(mgr, &msg)) {`
441
442			`switch (msg & MSG_TYPE_MASK) {`
443			`case MSG_TYPE_COMMAND:`
444			`resp.message_id = 0;`
445			`resp.data = mixart_msg_data;`
446			`resp.size = sizeof(mixart_msg_data);`
447			`err = get_msg(mgr, &resp, msg & ~MSG_TYPE_MASK);`
448			`if( err < 0 ) {`
449			`snd_printk(KERN_ERR "interrupt: error(%d) reading mf %x\n", err, msg);`
450			`break;`
451			`}`
452
453			`if(resp.message_id == MSG_SERVICES_TIMER_NOTIFY) {`
454			`int i;`
455			`struct mixart_timer_notify *notify;`
456			`notify = (struct mixart_timer_notify *)mixart_msg_data;`
457
458			`for(i=0; i<notify->stream_count; i++) {`
459
460			`u32 buffer_id = notify->streams[i].buffer_id;`
461			`unsigned int chip_number = (buffer_id & MIXART_NOTIFY_CARD_MASK) >> MIXART_NOTIFY_CARD_OFFSET; /* card0 to 3 */`
462			`unsigned int pcm_number = (buffer_id & MIXART_NOTIFY_PCM_MASK ) >> MIXART_NOTIFY_PCM_OFFSET; /* pcm0 to 3 */`
463			`unsigned int sub_number = buffer_id & MIXART_NOTIFY_SUBS_MASK; /* 0 to MIXART_PLAYBACK_STREAMS */`
464			`unsigned int is_capture = ((buffer_id & MIXART_NOTIFY_CAPT_MASK) != 0); /* playback == 0 / capture == 1 */`
465
466			`struct snd_mixart *chip = mgr->chip[chip_number];`
467			`struct mixart_stream *stream;`
468
469			`if ((chip_number >= mgr->num_cards) \|\| (pcm_number >= MIXART_PCM_TOTAL) \|\| (sub_number >= MIXART_PLAYBACK_STREAMS)) {`
470			`snd_printk(KERN_ERR "error MSG_SERVICES_TIMER_NOTIFY buffer_id (%x) pos(%d)\n",`
471			`buffer_id, notify->streams[i].sample_pos_low_part);`
472			`break;`
473			`}`
474
475			`if (is_capture)`
476			`stream = &chip->capture_stream[pcm_number];`
477			`else`
478			`stream = &chip->playback_stream[pcm_number][sub_number];`
479
480			`if (stream->substream && (stream->status == MIXART_STREAM_STATUS_RUNNING)) {`
481			`struct snd_pcm_runtime *runtime = stream->substream->runtime;`
482			`int elapsed = 0;`
483			`u64 sample_count = ((u64)notify->streams[i].sample_pos_high_part) << 32;`
484			`sample_count \|= notify->streams[i].sample_pos_low_part;`
485
486			`while (1) {`
487			`u64 new_elapse_pos = stream->abs_period_elapsed + runtime->period_size;`
488
489			`if (new_elapse_pos > sample_count) {`
490			`break; /* while */`
491			`}`
492			`else {`
493			`elapsed = 1;`
494			`stream->buf_periods++;`
495			`if (stream->buf_periods >= runtime->periods)`
496			`stream->buf_periods = 0;`
497
498			`stream->abs_period_elapsed = new_elapse_pos;`
499			`}`
500			`}`
501			`stream->buf_period_frag = (u32)( sample_count - stream->abs_period_elapsed );`
502
503			`if(elapsed) {`
504			`spin_unlock(&mgr->lock);`
505			`snd_pcm_period_elapsed(stream->substream);`
506			`spin_lock(&mgr->lock);`
507			`}`
508			`}`
509			`}`
510			`break;`
511			`}`
512			`if(resp.message_id == MSG_SERVICES_REPORT_TRACES) {`
513			`if(resp.size > 1) {`
514			`#ifndef __BIG_ENDIAN`
515			`/* Traces are text: the swapped msg_data has to be swapped back ! */`
516			`int i;`
517			`for(i=0; i<(resp.size/4); i++) {`
518			`(mixart_msg_data)[i] = cpu_to_be32((mixart_msg_data)[i]);`
519			`}`
520			`#endif`
521			`((char*)mixart_msg_data)[resp.size - 1] = 0;`
522			`snd_printdd("MIXART TRACE : %s\n", (char*)mixart_msg_data);`
523			`}`
524			`break;`
525			`}`
526
527			`snd_printdd("command %x not handled\n", resp.message_id);`
528			`break;`
529
530			`case MSG_TYPE_NOTIFY:`
531			`if(msg & MSG_CANCEL_NOTIFY_MASK) {`
532			`msg &= ~MSG_CANCEL_NOTIFY_MASK;`
533			`snd_printk(KERN_ERR "canceled notification %x !\n", msg);`
534			`}`
535			`/* no break, continue ! */`
536			`case MSG_TYPE_ANSWER:`
537			`/* answer or notification to a message we are waiting for*/`
538			`spin_lock(&mgr->msg_lock);`
539			`if( (msg & ~MSG_TYPE_MASK) == mgr->pending_event ) {`
540			`wake_up(&mgr->msg_sleep);`
541			`mgr->pending_event = 0;`
542			`}`
543			`/* answer to a message we did't want to wait for */`
544			`else {`
545			`mgr->msg_fifo[mgr->msg_fifo_writeptr] = msg;`
546			`mgr->msg_fifo_writeptr++;`
547			`mgr->msg_fifo_writeptr %= MSG_FIFO_SIZE;`
548			`tasklet_hi_schedule(&mgr->msg_taskq);`
549			`}`
550			`spin_unlock(&mgr->msg_lock);`
551			`break;`
552			`case MSG_TYPE_REQUEST:`
553			`default:`
554			`snd_printdd("interrupt received request %x\n", msg);`
555			`/* TODO : are there things to do here ? */`
556			`break;`
557			`} /* switch on msg type */`
558			`} /* while there are msgs */`
559
560			`/* allow interrupt again */`
561			`writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));`
562
563			`spin_unlock(&mgr->lock);`
564
565			`return IRQ_HANDLED;`
566			`}`
567
568
569			`void snd_mixart_init_mailbox(struct mixart_mgr *mgr)`
570			`{`
571			`writel( 0, MIXART_MEM( mgr, MSG_HOST_RSC_PROTECTION ) );`
572			`writel( 0, MIXART_MEM( mgr, MSG_AGENT_RSC_PROTECTION ) );`
573
574			`/* allow outbound messagebox to generate interrupts */`
575			`if(mgr->irq >= 0) {`
576			`writel_le( MIXART_ALLOW_OUTBOUND_DOORBELL, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));`
577			`}`
578			`return;`
579			`}`
580
581			`void snd_mixart_exit_mailbox(struct mixart_mgr *mgr)`
582			`{`
583			`/* no more interrupts on outbound messagebox */`
584			`writel_le( MIXART_HOST_ALL_INTERRUPT_MASKED, MIXART_REG( mgr, MIXART_PCI_OMIMR_OFFSET));`
585			`return;`
586			`}`
587
588			`void snd_mixart_reset_board(struct mixart_mgr *mgr)`
589			`{`
590			`/* reset miXart */`
591			`writel_be( 1, MIXART_REG(mgr, MIXART_BA1_BRUTAL_RESET_OFFSET) );`
592			`return;`
593			`}`