--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018, Linaro Limited
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/slab.h>
+#include <linux/list.h>
+#include <linux/slimbus.h>
+#include <uapi/sound/asound.h>
+#include "slimbus.h"
+
+/**
+ * struct segdist_code - Segment Distributions code from
+ * Table 20 of SLIMbus Specs Version 2.0
+ *
+ * @ratem: Channel Rate Multipler(Segments per Superframe)
+ * @seg_interval: Number of slots between the first Slot of Segment
+ * and the first slot of the next consecutive Segment.
+ * @segdist_code: Segment Distribution Code SD[11:0]
+ * @seg_offset_mask: Segment offset mask in SD[11:0]
+ * @segdist_codes: List of all possible Segmet Distribution codes.
+ */
+static const struct segdist_code {
+ int ratem;
+ int seg_interval;
+ int segdist_code;
+ u32 seg_offset_mask;
+
+} segdist_codes[] = {
+ {1, 1536, 0x200, 0xdff},
+ {2, 768, 0x100, 0xcff},
+ {4, 384, 0x080, 0xc7f},
+ {8, 192, 0x040, 0xc3f},
+ {16, 96, 0x020, 0xc1f},
+ {32, 48, 0x010, 0xc0f},
+ {64, 24, 0x008, 0xc07},
+ {128, 12, 0x004, 0xc03},
+ {256, 6, 0x002, 0xc01},
+ {512, 3, 0x001, 0xc00},
+ {3, 512, 0xe00, 0x1ff},
+ {6, 256, 0xd00, 0x0ff},
+ {12, 128, 0xc80, 0x07f},
+ {24, 64, 0xc40, 0x03f},
+ {48, 32, 0xc20, 0x01f},
+ {96, 16, 0xc10, 0x00f},
+ {192, 8, 0xc08, 0x007},
+ {364, 4, 0xc04, 0x003},
+ {768, 2, 0xc02, 0x001},
+};
+
+/*
+ * Presence Rate table for all Natural Frequencies
+ * The Presence rate of a constant bitrate stream is mean flow rate of the
+ * stream expressed in occupied Segments of that Data Channel per second.
+ * Table 66 from SLIMbus 2.0 Specs
+ *
+ * Index of the table corresponds to Presence rate code for the respective rate
+ * in the table.
+ */
+static const int slim_presence_rate_table[] = {
+ 0, /* Not Indicated */
+ 12000,
+ 24000,
+ 48000,
+ 96000,
+ 192000,
+ 384000,
+ 768000,
+ 0, /* Reserved */
+ 110250,
+ 220500,
+ 441000,
+ 882000,
+ 176400,
+ 352800,
+ 705600,
+ 4000,
+ 8000,
+ 16000,
+ 32000,
+ 64000,
+ 128000,
+ 256000,
+ 512000,
+};
+
+/*
+ * slim_stream_allocate() - Allocate a new SLIMbus Stream
+ * @dev:Slim device to be associated with
+ * @name: name of the stream
+ *
+ * This is very first call for SLIMbus streaming, this API will allocate
+ * a new SLIMbus stream and return a valid stream runtime pointer for client
+ * to use it in subsequent stream apis. state of stream is set to ALLOCATED
+ *
+ * Return: valid pointer on success and error code on failure.
+ * From ASoC DPCM framework, this state is linked to startup() operation.
+ */
+struct slim_stream_runtime *slim_stream_allocate(struct slim_device *dev,
+ const char *name)
+{
+ struct slim_stream_runtime *rt;
+
+ rt = kzalloc(sizeof(*rt), GFP_KERNEL);
+ if (!rt)
+ return ERR_PTR(-ENOMEM);
+
+ rt->name = kasprintf(GFP_KERNEL, "slim-%s", name);
+ if (!rt->name) {
+ kfree(rt);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ rt->dev = dev;
+ spin_lock(&dev->stream_list_lock);
+ list_add_tail(&rt->node, &dev->stream_list);
+ spin_unlock(&dev->stream_list_lock);
+
+ return rt;
+}
+EXPORT_SYMBOL_GPL(slim_stream_allocate);
+
+static int slim_connect_port_channel(struct slim_stream_runtime *stream,
+ struct slim_port *port)
+{
+ struct slim_device *sdev = stream->dev;
+ u8 wbuf[2];
+ struct slim_val_inf msg = {0, 2, NULL, wbuf, NULL};
+ u8 mc = SLIM_MSG_MC_CONNECT_SOURCE;
+ DEFINE_SLIM_LDEST_TXN(txn, mc, 6, stream->dev->laddr, &msg);
+
+ if (port->direction == SLIM_PORT_SINK)
+ txn.mc = SLIM_MSG_MC_CONNECT_SINK;
+
+ wbuf[0] = port->id;
+ wbuf[1] = port->ch.id;
+ port->ch.state = SLIM_CH_STATE_ASSOCIATED;
+ port->state = SLIM_PORT_UNCONFIGURED;
+
+ return slim_do_transfer(sdev->ctrl, &txn);
+}
+
+static int slim_disconnect_port(struct slim_stream_runtime *stream,
+ struct slim_port *port)
+{
+ struct slim_device *sdev = stream->dev;
+ u8 wbuf[1];
+ struct slim_val_inf msg = {0, 1, NULL, wbuf, NULL};
+ u8 mc = SLIM_MSG_MC_DISCONNECT_PORT;
+ DEFINE_SLIM_LDEST_TXN(txn, mc, 5, stream->dev->laddr, &msg);
+
+ wbuf[0] = port->id;
+ port->ch.state = SLIM_CH_STATE_DISCONNECTED;
+ port->state = SLIM_PORT_DISCONNECTED;
+
+ return slim_do_transfer(sdev->ctrl, &txn);
+}
+
+static int slim_deactivate_remove_channel(struct slim_stream_runtime *stream,
+ struct slim_port *port)
+{
+ struct slim_device *sdev = stream->dev;
+ u8 wbuf[1];
+ struct slim_val_inf msg = {0, 1, NULL, wbuf, NULL};
+ u8 mc = SLIM_MSG_MC_NEXT_DEACTIVATE_CHANNEL;
+ DEFINE_SLIM_LDEST_TXN(txn, mc, 5, stream->dev->laddr, &msg);
+ int ret;
+
+ wbuf[0] = port->ch.id;
+ ret = slim_do_transfer(sdev->ctrl, &txn);
+ if (ret)
+ return ret;
+
+ txn.mc = SLIM_MSG_MC_NEXT_REMOVE_CHANNEL;
+ port->ch.state = SLIM_CH_STATE_REMOVED;
+
+ return slim_do_transfer(sdev->ctrl, &txn);
+}
+
+static int slim_get_prate_code(int rate)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(slim_presence_rate_table); i++) {
+ if (rate == slim_presence_rate_table[i])
+ return i;
+ }
+
+ return -EINVAL;
+}
+
+/*
+ * slim_stream_prepare() - Prepare a SLIMbus Stream
+ *
+ * @rt: instance of slim stream runtime to configure
+ * @cfg: new configuration for the stream
+ *
+ * This API will configure SLIMbus stream with config parameters from cfg.
+ * return zero on success and error code on failure. From ASoC DPCM framework,
+ * this state is linked to hw_params() operation.
+ */
+int slim_stream_prepare(struct slim_stream_runtime *rt,
+ struct slim_stream_config *cfg)
+{
+ struct slim_controller *ctrl = rt->dev->ctrl;
+ struct slim_port *port;
+ int num_ports, i, port_id;
+
+ if (rt->ports) {
+ dev_err(&rt->dev->dev, "Stream already Prepared\n");
+ return -EINVAL;
+ }
+
+ num_ports = hweight32(cfg->port_mask);
+ rt->ports = kcalloc(num_ports, sizeof(*port), GFP_KERNEL);
+ if (!rt->ports)
+ return -ENOMEM;
+
+ rt->num_ports = num_ports;
+ rt->rate = cfg->rate;
+ rt->bps = cfg->bps;
+ rt->direction = cfg->direction;
+
+ if (cfg->rate % ctrl->a_framer->superfreq) {
+ /*
+ * data rate not exactly multiple of super frame,
+ * use PUSH/PULL protocol
+ */
+ if (cfg->direction == SNDRV_PCM_STREAM_PLAYBACK)
+ rt->prot = SLIM_PROTO_PUSH;
+ else
+ rt->prot = SLIM_PROTO_PULL;
+ } else {
+ rt->prot = SLIM_PROTO_ISO;
+ }
+
+ rt->ratem = cfg->rate/ctrl->a_framer->superfreq;
+
+ i = 0;
+ for_each_set_bit(port_id, &cfg->port_mask, SLIM_DEVICE_MAX_PORTS) {
+ port = &rt->ports[i];
+ port->state = SLIM_PORT_DISCONNECTED;
+ port->id = port_id;
+ port->ch.prrate = slim_get_prate_code(cfg->rate);
+ port->ch.id = cfg->chs[i];
+ port->ch.data_fmt = SLIM_CH_DATA_FMT_NOT_DEFINED;
+ port->ch.aux_fmt = SLIM_CH_AUX_FMT_NOT_APPLICABLE;
+ port->ch.state = SLIM_CH_STATE_ALLOCATED;
+
+ if (cfg->direction == SNDRV_PCM_STREAM_PLAYBACK)
+ port->direction = SLIM_PORT_SINK;
+ else
+ port->direction = SLIM_PORT_SOURCE;
+
+ slim_connect_port_channel(rt, port);
+ i++;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(slim_stream_prepare);
+
+static int slim_define_channel_content(struct slim_stream_runtime *stream,
+ struct slim_port *port)
+{
+ struct slim_device *sdev = stream->dev;
+ u8 wbuf[4];
+ struct slim_val_inf msg = {0, 4, NULL, wbuf, NULL};
+ u8 mc = SLIM_MSG_MC_NEXT_DEFINE_CONTENT;
+ DEFINE_SLIM_LDEST_TXN(txn, mc, 8, stream->dev->laddr, &msg);
+
+ wbuf[0] = port->ch.id;
+ wbuf[1] = port->ch.prrate;
+
+ /* Frequency Locked for ISO Protocol */
+ if (stream->prot != SLIM_PROTO_ISO)
+ wbuf[1] |= SLIM_CHANNEL_CONTENT_FL;
+
+ wbuf[2] = port->ch.data_fmt | (port->ch.aux_fmt << 4);
+ wbuf[3] = stream->bps/SLIM_SLOT_LEN_BITS;
+ port->ch.state = SLIM_CH_STATE_CONTENT_DEFINED;
+
+ return slim_do_transfer(sdev->ctrl, &txn);
+}
+
+static int slim_get_segdist_code(int ratem)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(segdist_codes); i++) {
+ if (segdist_codes[i].ratem == ratem)
+ return segdist_codes[i].segdist_code;
+ }
+
+ return -EINVAL;
+}
+
+static int slim_define_channel(struct slim_stream_runtime *stream,
+ struct slim_port *port)
+{
+ struct slim_device *sdev = stream->dev;
+ u8 wbuf[4];
+ struct slim_val_inf msg = {0, 4, NULL, wbuf, NULL};
+ u8 mc = SLIM_MSG_MC_NEXT_DEFINE_CHANNEL;
+ DEFINE_SLIM_LDEST_TXN(txn, mc, 8, stream->dev->laddr, &msg);
+
+ port->ch.seg_dist = slim_get_segdist_code(stream->ratem);
+
+ wbuf[0] = port->ch.id;
+ wbuf[1] = port->ch.seg_dist & 0xFF;
+ wbuf[2] = (stream->prot << 4) | ((port->ch.seg_dist & 0xF00) >> 8);
+ if (stream->prot == SLIM_PROTO_ISO)
+ wbuf[3] = stream->bps/SLIM_SLOT_LEN_BITS;
+ else
+ wbuf[3] = stream->bps/SLIM_SLOT_LEN_BITS + 1;
+
+ port->ch.state = SLIM_CH_STATE_DEFINED;
+
+ return slim_do_transfer(sdev->ctrl, &txn);
+}
+
+static int slim_activate_channel(struct slim_stream_runtime *stream,
+ struct slim_port *port)
+{
+ struct slim_device *sdev = stream->dev;
+ u8 wbuf[1];
+ struct slim_val_inf msg = {0, 1, NULL, wbuf, NULL};
+ u8 mc = SLIM_MSG_MC_NEXT_ACTIVATE_CHANNEL;
+ DEFINE_SLIM_LDEST_TXN(txn, mc, 5, stream->dev->laddr, &msg);
+
+ txn.msg->num_bytes = 1;
+ txn.msg->wbuf = wbuf;
+ wbuf[0] = port->ch.id;
+ port->ch.state = SLIM_CH_STATE_ACTIVE;
+
+ return slim_do_transfer(sdev->ctrl, &txn);
+}
+
+/*
+ * slim_stream_enable() - Enable a prepared SLIMbus Stream
+ *
+ * @stream: instance of slim stream runtime to enable
+ *
+ * This API will enable all the ports and channels associated with
+ * SLIMbus stream
+ *
+ * Return: zero on success and error code on failure. From ASoC DPCM framework,
+ * this state is linked to trigger() start operation.
+ */
+int slim_stream_enable(struct slim_stream_runtime *stream)
+{
+ DEFINE_SLIM_BCAST_TXN(txn, SLIM_MSG_MC_BEGIN_RECONFIGURATION,
+ 3, SLIM_LA_MANAGER, NULL);
+ struct slim_controller *ctrl = stream->dev->ctrl;
+ int ret, i;
+
+ if (ctrl->enable_stream) {
+ ret = ctrl->enable_stream(stream);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < stream->num_ports; i++)
+ stream->ports[i].ch.state = SLIM_CH_STATE_ACTIVE;
+
+ return ret;
+ }
+
+ ret = slim_do_transfer(ctrl, &txn);
+ if (ret)
+ return ret;
+
+ /* define channels first before activating them */
+ for (i = 0; i < stream->num_ports; i++) {
+ struct slim_port *port = &stream->ports[i];
+
+ slim_define_channel(stream, port);
+ slim_define_channel_content(stream, port);
+ }
+
+ for (i = 0; i < stream->num_ports; i++) {
+ struct slim_port *port = &stream->ports[i];
+
+ slim_activate_channel(stream, port);
+ port->state = SLIM_PORT_CONFIGURED;
+ }
+ txn.mc = SLIM_MSG_MC_RECONFIGURE_NOW;
+
+ return slim_do_transfer(ctrl, &txn);
+}
+EXPORT_SYMBOL_GPL(slim_stream_enable);
+
+/*
+ * slim_stream_disable() - Disable a SLIMbus Stream
+ *
+ * @stream: instance of slim stream runtime to disable
+ *
+ * This API will disable all the ports and channels associated with
+ * SLIMbus stream
+ *
+ * Return: zero on success and error code on failure. From ASoC DPCM framework,
+ * this state is linked to trigger() pause operation.
+ */
+int slim_stream_disable(struct slim_stream_runtime *stream)
+{
+ DEFINE_SLIM_BCAST_TXN(txn, SLIM_MSG_MC_BEGIN_RECONFIGURATION,
+ 3, SLIM_LA_MANAGER, NULL);
+ struct slim_controller *ctrl = stream->dev->ctrl;
+ int ret, i;
+
+ if (ctrl->disable_stream)
+ ctrl->disable_stream(stream);
+
+ ret = slim_do_transfer(ctrl, &txn);
+ if (ret)
+ return ret;
+
+ for (i = 0; i < stream->num_ports; i++)
+ slim_deactivate_remove_channel(stream, &stream->ports[i]);
+
+ txn.mc = SLIM_MSG_MC_RECONFIGURE_NOW;
+
+ return slim_do_transfer(ctrl, &txn);
+}
+EXPORT_SYMBOL_GPL(slim_stream_disable);
+
+/*
+ * slim_stream_unprepare() - Un-prepare a SLIMbus Stream
+ *
+ * @stream: instance of slim stream runtime to unprepare
+ *
+ * This API will un allocate all the ports and channels associated with
+ * SLIMbus stream
+ *
+ * Return: zero on success and error code on failure. From ASoC DPCM framework,
+ * this state is linked to trigger() stop operation.
+ */
+int slim_stream_unprepare(struct slim_stream_runtime *stream)
+{
+ int i;
+
+ for (i = 0; i < stream->num_ports; i++)
+ slim_disconnect_port(stream, &stream->ports[i]);
+
+ kfree(stream->ports);
+ stream->ports = NULL;
+ stream->num_ports = 0;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(slim_stream_unprepare);
+
+/*
+ * slim_stream_free() - Free a SLIMbus Stream
+ *
+ * @stream: instance of slim stream runtime to free
+ *
+ * This API will un allocate all the memory associated with
+ * slim stream runtime, user is not allowed to make an dereference
+ * to stream after this call.
+ *
+ * Return: zero on success and error code on failure. From ASoC DPCM framework,
+ * this state is linked to shutdown() operation.
+ */
+int slim_stream_free(struct slim_stream_runtime *stream)
+{
+ struct slim_device *sdev = stream->dev;
+
+ spin_lock(&sdev->stream_list_lock);
+ list_del(&stream->node);
+ spin_unlock(&sdev->stream_list_lock);
+
+ kfree(stream->name);
+ kfree(stream);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(slim_stream_free);
projects / linux-2.6-microblaze.git / blobdiff