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