// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Driver for Digigram miXart soundcards
*
* low level interface with interrupt handling and mail box implementation
*
* Copyright (c) 2003 by Digigram <[email protected]>
*/
#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_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, ¬if_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;
BUILD_BUG_ON(sizeof(notify) > sizeof(mixart_msg_data));
if (snd_BUG_ON(notify->stream_count > ARRAY_SIZE(notify->streams)))
break;
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);
}
fallthrough;
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;
}
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