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* intel_sst_pvt.c - Intel SST Driver for audio engine
*
* Copyright (C) 2008-10 Intel Corp
* Authors: Vinod Koul <vinod.koul@intel.com>
* Harsha Priya <priya.harsha@intel.com>
* Dharageswari R <dharageswari.r@intel.com>
* KP Jeeja <jeeja.kp@intel.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; version 2 of the License.
*
* 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.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This driver exposes the audio engine functionalities to the ALSA
* and middleware.
*
* This file contains all private functions
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/pci.h>
#include <linux/fs.h>
#include <linux/firmware.h>
#include <linux/sched.h>
#include "intel_sst.h"
#include "intel_sst_ioctl.h"
#include "intel_sst_fw_ipc.h"
#include "intel_sst_common.h"
/*
* sst_get_block_stream - get a new block stream
*
* @sst_drv_ctx: Driver context structure
*
* This function assigns a block for the calls that dont have stream context yet
* the blocks are used for waiting on Firmware's response for any operation
* Should be called with stream lock held
*/
int sst_get_block_stream(struct intel_sst_drv *sst_drv_ctx)
{
int i;
for (i = 0; i < MAX_ACTIVE_STREAM; i++) {
if (sst_drv_ctx->alloc_block[i].sst_id == BLOCK_UNINIT) {
sst_drv_ctx->alloc_block[i].ops_block.condition = false;
sst_drv_ctx->alloc_block[i].ops_block.ret_code = 0;
sst_drv_ctx->alloc_block[i].sst_id = 0;
break;
}
}
if (i == MAX_ACTIVE_STREAM) {
pr_err("max alloc_stream reached\n");
i = -EBUSY; /* active stream limit reached */
}
return i;
}
/*
* sst_wait_interruptible - wait on event
*
* @sst_drv_ctx: Driver context
* @block: Driver block to wait on
*
* This function waits without a timeout (and is interruptable) for a
* given block event
*/
int sst_wait_interruptible(struct intel_sst_drv *sst_drv_ctx,
struct sst_block *block)
{
int retval = 0;
if (!wait_event_interruptible(sst_drv_ctx->wait_queue,
block->condition)) {
/* event wake */
if (block->ret_code < 0) {
pr_err("stream failed %d\n", block->ret_code);
retval = -EBUSY;
} else {
pr_debug("event up\n");
retval = 0;
}
} else {
pr_err("signal interrupted\n");
retval = -EINTR;
}
return retval;
}
/*
* sst_wait_interruptible_timeout - wait on event interruptable
*
* @sst_drv_ctx: Driver context
* @block: Driver block to wait on
* @timeout: time for wait on
*
* This function waits with a timeout value (and is interruptible) on a
* given block event
*/
int sst_wait_interruptible_timeout(
struct intel_sst_drv *sst_drv_ctx,
struct sst_block *block, int timeout)
{
int retval = 0;
pr_debug("sst_wait_interruptible_timeout - waiting....\n");
if (wait_event_interruptible_timeout(sst_drv_ctx->wait_queue,
block->condition,
msecs_to_jiffies(timeout))) {
if (block->ret_code < 0)
pr_err("stream failed %d\n", block->ret_code);
else
pr_debug("event up\n");
retval = block->ret_code;
} else {
block->on = false;
pr_err("timeout occurred...\n");
/*setting firmware state as uninit so that the
firmware will get re-downloaded on next request
this is because firmare not responding for 5 sec
is equalant to some unrecoverable error of FW
sst_drv_ctx->sst_state = SST_UN_INIT;*/
retval = -EBUSY;
}
return retval;
}
/*
* sst_wait_timeout - wait on event for timeout
*
* @sst_drv_ctx: Driver context
* @block: Driver block to wait on
*
* This function waits with a timeout value (and is not interruptible) on a
* given block event
*/
int sst_wait_timeout(struct intel_sst_drv *sst_drv_ctx,
struct stream_alloc_block *block)
{
int retval = 0;
/* NOTE:
Observed that FW processes the alloc msg and replies even
before the alloc thread has finished execution */
pr_debug("waiting for %x, condition %x\n",
block->sst_id, block->ops_block.condition);
if (wait_event_interruptible_timeout(sst_drv_ctx->wait_queue,
block->ops_block.condition,
msecs_to_jiffies(SST_BLOCK_TIMEOUT))) {
/* event wake */
pr_debug("Event wake %x\n", block->ops_block.condition);
pr_debug("message ret: %d\n", block->ops_block.ret_code);
retval = block->ops_block.ret_code;
} else {
block->ops_block.on = false;
pr_err("Wait timed-out %x\n", block->ops_block.condition);
/* settign firmware state as uninit so that the
firmware will get redownloaded on next request
this is because firmare not responding for 5 sec
is equalant to some unrecoverable error of FW
sst_drv_ctx->sst_state = SST_UN_INIT;*/
retval = -EBUSY;
}
return retval;
}
/*
* sst_create_large_msg - create a large IPC message
*
* @arg: ipc message
*
* this function allocates structures to send a large message to the firmware
*/
int sst_create_large_msg(struct ipc_post **arg)
{
struct ipc_post *msg;
msg = kzalloc(sizeof(struct ipc_post), GFP_ATOMIC);
if (!msg) {
pr_err("kzalloc msg failed\n");
return -ENOMEM;
}
msg->mailbox_data = kzalloc(SST_MAILBOX_SIZE, GFP_ATOMIC);
if (!msg->mailbox_data) {
kfree(msg);
pr_err("kzalloc mailbox_data failed");
return -ENOMEM;
}
*arg = msg;
return 0;
}
/*
* sst_create_short_msg - create a short IPC message
*
* @arg: ipc message
*
* this function allocates structures to send a short message to the firmware
*/
int sst_create_short_msg(struct ipc_post **arg)
{
struct ipc_post *msg;
msg = kzalloc(sizeof(*msg), GFP_ATOMIC);
if (!msg) {
pr_err("kzalloc msg failed\n");
return -ENOMEM;
}
msg->mailbox_data = NULL;
*arg = msg;
return 0;
}
/*
* sst_clean_stream - clean the stream context
*
* @stream: stream structure
*
* this function resets the stream contexts
* should be called in free
*/
void sst_clean_stream(struct stream_info *stream)
{
struct sst_stream_bufs *bufs = NULL, *_bufs;
stream->status = STREAM_UN_INIT;
stream->prev = STREAM_UN_INIT;
mutex_lock(&stream->lock);
list_for_each_entry_safe(bufs, _bufs, &stream->bufs, node) {
list_del(&bufs->node);
kfree(bufs);
}
mutex_unlock(&stream->lock);
if (stream->ops != STREAM_OPS_PLAYBACK_DRM)
kfree(stream->decode_ibuf);
}
/*
* sst_wake_up_alloc_block - wake up waiting block
*
* @sst_drv_ctx: Driver context
* @sst_id: stream id
* @status: status of wakeup
* @data: data pointer of wakeup
*
* This function wakes up a sleeping block event based on the response
*/
void sst_wake_up_alloc_block(struct intel_sst_drv *sst_drv_ctx,
u8 sst_id, int status, void *data)
{
int i;
/* Unblock with retval code */
for (i = 0; i < MAX_ACTIVE_STREAM; i++) {
if (sst_id == sst_drv_ctx->alloc_block[i].sst_id) {
sst_drv_ctx->alloc_block[i].ops_block.condition = true;
sst_drv_ctx->alloc_block[i].ops_block.ret_code = status;
sst_drv_ctx->alloc_block[i].ops_block.data = data;
wake_up(&sst_drv_ctx->wait_queue);
break;
}
}
}
/*
* sst_enable_rx_timeslot - Send msg to query for stream parameters
* @status: rx timeslot to be enabled
*
* This function is called when the RX timeslot is required to be enabled
*/
int sst_enable_rx_timeslot(int status)
{
int retval = 0;
struct ipc_post *msg = NULL;
if (sst_create_short_msg(&msg)) {
pr_err("mem allocation failed\n");
return -ENOMEM;
}
pr_debug("ipc message sending: ENABLE_RX_TIME_SLOT\n");
sst_fill_header(&msg->header, IPC_IA_ENABLE_RX_TIME_SLOT, 0, 0);
msg->header.part.data = status;
sst_drv_ctx->hs_info_blk.condition = false;
sst_drv_ctx->hs_info_blk.ret_code = 0;
sst_drv_ctx->hs_info_blk.on = true;
spin_lock(&sst_drv_ctx->list_spin_lock);
list_add_tail(&msg->node,
&sst_drv_ctx->ipc_dispatch_list);
spin_unlock(&sst_drv_ctx->list_spin_lock);
sst_post_message(&sst_drv_ctx->ipc_post_msg_wq);
retval = sst_wait_interruptible_timeout(sst_drv_ctx,
&sst_drv_ctx->hs_info_blk, SST_BLOCK_TIMEOUT);
return retval;
}
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