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linux/sound/pci/mixart/mixart_core.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

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// 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 <alsa@digigram.com>
*/
#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
mutex_lock(&mgr->msg_lock);
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:
mutex_unlock(&mgr->msg_lock);
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;
err = get_msg(mgr, &resp, msg_frame);
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;
}
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