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/*
* hdac-ext-stream.c - HD-audio extended stream operations.
*
* Copyright (C) 2015 Intel Corp
* Author: Jeeja KP <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.
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/delay.h>
#include <linux/slab.h>
#include <sound/pcm.h>
#include <sound/hda_register.h>
#include <sound/hdaudio_ext.h>
/**
* snd_hdac_ext_stream_init - initialize each stream (aka device)
* @ebus: HD-audio ext core bus
* @stream: HD-audio ext core stream object to initialize
* @idx: stream index number
* @direction: stream direction (SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE)
* @tag: the tag id to assign
*
* initialize the stream, if ppcap is enabled then init those and then
* invoke hdac stream initialization routine
*/
void snd_hdac_ext_stream_init(struct hdac_ext_bus *ebus,
struct hdac_ext_stream *stream,
int idx, int direction, int tag)
{
struct hdac_bus *bus = &ebus->bus;
if (ebus->ppcap) {
stream->pphc_addr = ebus->ppcap + AZX_PPHC_BASE +
AZX_PPHC_INTERVAL * idx;
stream->pplc_addr = ebus->ppcap + AZX_PPLC_BASE +
AZX_PPLC_MULTI * ebus->num_streams +
AZX_PPLC_INTERVAL * idx;
}
if (ebus->spbcap) {
stream->spib_addr = ebus->spbcap + AZX_SPB_BASE +
AZX_SPB_INTERVAL * idx +
AZX_SPB_SPIB;
stream->fifo_addr = ebus->spbcap + AZX_SPB_BASE +
AZX_SPB_INTERVAL * idx +
AZX_SPB_MAXFIFO;
}
if (ebus->drsmcap)
stream->dpibr_addr = ebus->drsmcap + AZX_DRSM_BASE +
AZX_DRSM_INTERVAL * idx;
stream->decoupled = false;
snd_hdac_stream_init(bus, &stream->hstream, idx, direction, tag);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_init);
/**
* snd_hdac_ext_stream_init_all - create and initialize the stream objects
* for an extended hda bus
* @ebus: HD-audio ext core bus
* @start_idx: start index for streams
* @num_stream: number of streams to initialize
* @dir: direction of streams
*/
int snd_hdac_ext_stream_init_all(struct hdac_ext_bus *ebus, int start_idx,
int num_stream, int dir)
{
int stream_tag = 0;
int i, tag, idx = start_idx;
for (i = 0; i < num_stream; i++) {
struct hdac_ext_stream *stream =
kzalloc(sizeof(*stream), GFP_KERNEL);
if (!stream)
return -ENOMEM;
tag = ++stream_tag;
snd_hdac_ext_stream_init(ebus, stream, idx, dir, tag);
idx++;
}
return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_init_all);
/**
* snd_hdac_stream_free_all - free hdac extended stream objects
*
* @ebus: HD-audio ext core bus
*/
void snd_hdac_stream_free_all(struct hdac_ext_bus *ebus)
{
struct hdac_stream *s, *_s;
struct hdac_ext_stream *stream;
struct hdac_bus *bus = ebus_to_hbus(ebus);
list_for_each_entry_safe(s, _s, &bus->stream_list, list) {
stream = stream_to_hdac_ext_stream(s);
snd_hdac_ext_stream_decouple(ebus, stream, false);
list_del(&s->list);
kfree(stream);
}
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_free_all);
/**
* snd_hdac_ext_stream_decouple - decouple the hdac stream
* @ebus: HD-audio ext core bus
* @stream: HD-audio ext core stream object to initialize
* @decouple: flag to decouple
*/
void snd_hdac_ext_stream_decouple(struct hdac_ext_bus *ebus,
struct hdac_ext_stream *stream, bool decouple)
{
struct hdac_stream *hstream = &stream->hstream;
struct hdac_bus *bus = &ebus->bus;
spin_lock_irq(&bus->reg_lock);
if (decouple)
snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL, 0,
AZX_PPCTL_PROCEN(hstream->index));
else
snd_hdac_updatel(ebus->ppcap, AZX_REG_PP_PPCTL,
AZX_PPCTL_PROCEN(hstream->index), 0);
stream->decoupled = decouple;
spin_unlock_irq(&bus->reg_lock);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_decouple);
/**
* snd_hdac_ext_linkstream_start - start a stream
* @stream: HD-audio ext core stream to start
*/
void snd_hdac_ext_link_stream_start(struct hdac_ext_stream *stream)
{
snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, 0, AZX_PPLCCTL_RUN);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_start);
/**
* snd_hdac_ext_link_stream_clear - stop a stream DMA
* @stream: HD-audio ext core stream to stop
*/
void snd_hdac_ext_link_stream_clear(struct hdac_ext_stream *stream)
{
snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, AZX_PPLCCTL_RUN, 0);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_clear);
/**
* snd_hdac_ext_link_stream_reset - reset a stream
* @stream: HD-audio ext core stream to reset
*/
void snd_hdac_ext_link_stream_reset(struct hdac_ext_stream *stream)
{
unsigned char val;
int timeout;
snd_hdac_ext_link_stream_clear(stream);
snd_hdac_updatel(stream->pplc_addr, AZX_REG_PPLCCTL, 0, AZX_PPLCCTL_STRST);
udelay(3);
timeout = 50;
do {
val = readl(stream->pplc_addr + AZX_REG_PPLCCTL) &
AZX_PPLCCTL_STRST;
if (val)
break;
udelay(3);
} while (--timeout);
val &= ~AZX_PPLCCTL_STRST;
writel(val, stream->pplc_addr + AZX_REG_PPLCCTL);
udelay(3);
timeout = 50;
/* waiting for hardware to report that the stream is out of reset */
do {
val = readl(stream->pplc_addr + AZX_REG_PPLCCTL) & AZX_PPLCCTL_STRST;
if (!val)
break;
udelay(3);
} while (--timeout);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_reset);
/**
* snd_hdac_ext_link_stream_setup - set up the SD for streaming
* @stream: HD-audio ext core stream to set up
* @fmt: stream format
*/
int snd_hdac_ext_link_stream_setup(struct hdac_ext_stream *stream, int fmt)
{
struct hdac_stream *hstream = &stream->hstream;
unsigned int val;
/* make sure the run bit is zero for SD */
snd_hdac_ext_link_stream_clear(stream);
/* program the stream_tag */
val = readl(stream->pplc_addr + AZX_REG_PPLCCTL);
val = (val & ~AZX_PPLCCTL_STRM_MASK) |
(hstream->stream_tag << AZX_PPLCCTL_STRM_SHIFT);
writel(val, stream->pplc_addr + AZX_REG_PPLCCTL);
/* program the stream format */
writew(fmt, stream->pplc_addr + AZX_REG_PPLCFMT);
return 0;
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_link_stream_setup);
/**
* snd_hdac_ext_link_set_stream_id - maps stream id to link output
* @link: HD-audio ext link to set up
* @stream: stream id
*/
void snd_hdac_ext_link_set_stream_id(struct hdac_ext_link *link,
int stream)
{
snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, (1 << stream), 1 << stream);
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_link_set_stream_id);
/**
* snd_hdac_ext_link_clear_stream_id - maps stream id to link output
* @link: HD-audio ext link to set up
* @stream: stream id
*/
void snd_hdac_ext_link_clear_stream_id(struct hdac_ext_link *link,
int stream)
{
snd_hdac_updatew(link->ml_addr, AZX_REG_ML_LOSIDV, 0, (1 << stream));
}
EXPORT_SYMBOL_GPL(snd_hdac_ext_link_clear_stream_id);
static struct hdac_ext_stream *
hdac_ext_link_stream_assign(struct hdac_ext_bus *ebus,
struct snd_pcm_substream *substream)
{
struct hdac_ext_stream *res = NULL;
struct hdac_stream *stream = NULL;
struct hdac_bus *hbus = &ebus->bus;
if (!ebus->ppcap) {
dev_err(hbus->dev, "stream type not supported\n");<
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