--- /dev/null
+/*
+ * 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 <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;
+ }
+
+ 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_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), 0);
+}
+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");
+ return NULL;
+ }
+
+ list_for_each_entry(stream, &hbus->stream_list, list) {
+ struct hdac_ext_stream *hstream = container_of(stream,
+ struct hdac_ext_stream,
+ hstream);
+ if (stream->direction != substream->stream)
+ continue;
+
+ /* check if decoupled stream and not in use is available */
+ if (hstream->decoupled && !hstream->link_locked) {
+ res = hstream;
+ break;
+ }
+
+ if (!hstream->link_locked) {
+ snd_hdac_ext_stream_decouple(ebus, hstream, true);
+ res = hstream;
+ break;
+ }
+ }
+ if (res) {
+ spin_lock_irq(&hbus->reg_lock);
+ res->link_locked = 1;
+ res->link_substream = substream;
+ spin_unlock_irq(&hbus->reg_lock);
+ }
+ return res;
+}
+
+static struct hdac_ext_stream *
+hdac_ext_host_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;
+ int key;
+
+ if (!ebus->ppcap) {
+ dev_err(hbus->dev, "stream type not supported\n");
+ return NULL;
+ }
+
+ /* make a non-zero unique key for the substream */
+ key = (substream->pcm->device << 16) | (substream->number << 2) |
+ (substream->stream + 1);
+
+ list_for_each_entry(stream, &hbus->stream_list, list) {
+ struct hdac_ext_stream *hstream = container_of(stream,
+ struct hdac_ext_stream,
+ hstream);
+ if (stream->direction != substream->stream)
+ continue;
+
+ if (stream->opened) {
+ if (!hstream->decoupled)
+ snd_hdac_ext_stream_decouple(ebus, hstream, true);
+ res = hstream;
+ break;
+ }
+ }
+ if (res) {
+ spin_lock_irq(&hbus->reg_lock);
+ res->hstream.opened = 1;
+ res->hstream.running = 0;
+ res->hstream.assigned_key = key;
+ res->hstream.substream = substream;
+ spin_unlock_irq(&hbus->reg_lock);
+ }
+
+ return res;
+}
+
+/**
+ * snd_hdac_ext_stream_assign - assign a stream for the PCM
+ * @ebus: HD-audio ext core bus
+ * @substream: PCM substream to assign
+ * @type: type of stream (coupled, host or link stream)
+ *
+ * This assigns the stream based on the type (coupled/host/link), for the
+ * given PCM substream, assigns it and returns the stream object
+ *
+ * coupled: Looks for an unused stream
+ * host: Looks for an unused decoupled host stream
+ * link: Looks for an unused decoupled link stream
+ *
+ * If no stream is free, returns NULL. The function tries to keep using
+ * the same stream object when it's used beforehand. when a stream is
+ * decoupled, it becomes a host stream and link stream.
+ */
+struct hdac_ext_stream *snd_hdac_ext_stream_assign(struct hdac_ext_bus *ebus,
+ struct snd_pcm_substream *substream,
+ int type)
+{
+ struct hdac_ext_stream *hstream = NULL;
+ struct hdac_stream *stream = NULL;
+ struct hdac_bus *hbus = &ebus->bus;
+
+ switch (type) {
+ case HDAC_EXT_STREAM_TYPE_COUPLED:
+ stream = snd_hdac_stream_assign(hbus, substream);
+ if (stream)
+ hstream = container_of(stream,
+ struct hdac_ext_stream, hstream);
+ return hstream;
+
+ case HDAC_EXT_STREAM_TYPE_HOST:
+ return hdac_ext_host_stream_assign(ebus, substream);
+
+ case HDAC_EXT_STREAM_TYPE_LINK:
+ return hdac_ext_link_stream_assign(ebus, substream);
+
+ default:
+ return NULL;
+ }
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_assign);
+
+/**
+ * snd_hdac_ext_stream_release - release the assigned stream
+ * @stream: HD-audio ext core stream to release
+ * @type: type of stream (coupled, host or link stream)
+ *
+ * Release the stream that has been assigned by snd_hdac_ext_stream_assign().
+ */
+void snd_hdac_ext_stream_release(struct hdac_ext_stream *stream, int type)
+{
+ struct hdac_bus *bus = stream->hstream.bus;
+ struct hdac_ext_bus *ebus = hbus_to_ebus(bus);
+
+ switch (type) {
+ case HDAC_EXT_STREAM_TYPE_COUPLED:
+ snd_hdac_stream_release(&stream->hstream);
+ break;
+
+ case HDAC_EXT_STREAM_TYPE_HOST:
+ if (stream->decoupled) {
+ snd_hdac_ext_stream_decouple(ebus, stream, false);
+ snd_hdac_stream_release(&stream->hstream);
+ }
+ break;
+
+ case HDAC_EXT_STREAM_TYPE_LINK:
+ if (stream->decoupled)
+ snd_hdac_ext_stream_decouple(ebus, stream, false);
+ spin_lock_irq(&bus->reg_lock);
+ stream->link_locked = 0;
+ stream->link_substream = NULL;
+ spin_unlock_irq(&bus->reg_lock);
+ break;
+
+ default:
+ dev_dbg(bus->dev, "Invalid type %d\n", type);
+ }
+
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_release);
+
+/**
+ * snd_hdac_ext_stream_spbcap_enable - enable SPIB for a stream
+ * @ebus: HD-audio ext core bus
+ * @enable: flag to enable/disable SPIB
+ * @index: stream index for which SPIB need to be enabled
+ */
+void snd_hdac_ext_stream_spbcap_enable(struct hdac_ext_bus *ebus,
+ bool enable, int index)
+{
+ u32 mask = 0;
+ u32 register_mask = 0;
+ struct hdac_bus *bus = &ebus->bus;
+
+ if (!ebus->spbcap) {
+ dev_err(bus->dev, "Address of SPB capability is NULL");
+ return;
+ }
+
+ mask |= (1 << index);
+
+ register_mask = snd_hdac_chip_readl(bus, SPB_SPBFCCTL);
+
+ mask |= register_mask;
+
+ if (enable)
+ snd_hdac_updatel(ebus->spbcap, AZX_REG_SPB_SPBFCCTL, 0, mask);
+ else
+ snd_hdac_updatel(ebus->spbcap, AZX_REG_SPB_SPBFCCTL, mask, 0);
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_spbcap_enable);
+
+/**
+ * snd_hdac_ext_stop_streams - stop all stream if running
+ * @ebus: HD-audio ext core bus
+ */
+void snd_hdac_ext_stop_streams(struct hdac_ext_bus *ebus)
+{
+ struct hdac_bus *bus = ebus_to_hbus(ebus);
+ struct hdac_stream *stream;
+
+ if (bus->chip_init) {
+ list_for_each_entry(stream, &bus->stream_list, list)
+ snd_hdac_stream_stop(stream);
+ snd_hdac_bus_stop_chip(bus);
+ }
+}
+EXPORT_SYMBOL_GPL(snd_hdac_ext_stop_streams);
projects / linux-beck.git / commitdiff