454 lines
12 KiB
C
454 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* hdac-ext-stream.c - HD-audio extended stream operations.
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*
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* Copyright (C) 2015 Intel Corp
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* Author: Jeeja KP <jeeja.kp@intel.com>
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <linux/pci_ids.h>
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#include <linux/slab.h>
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#include <sound/pcm.h>
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#include <sound/hda_register.h>
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#include <sound/hdaudio_ext.h>
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#include <sound/compress_driver.h>
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/**
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* snd_hdac_ext_host_stream_setup - Setup a HOST stream.
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* @hext_stream: HDAudio stream to set up.
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* @code_loading: Whether the stream is for PCM or code-loading.
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*
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* Return: Zero on success or negative error code.
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*/
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int snd_hdac_ext_host_stream_setup(struct hdac_ext_stream *hext_stream, bool code_loading)
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{
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return hext_stream->host_setup(hdac_stream(hext_stream), code_loading);
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_host_stream_setup);
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/**
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* snd_hdac_apl_host_stream_setup - Setup a HOST stream following procedure
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* recommended for ApolloLake devices.
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* @hstream: HDAudio stream to set up.
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* @code_loading: Whether the stream is for PCM or code-loading.
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*
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* Return: Zero on success or negative error code.
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*/
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static int snd_hdac_apl_host_stream_setup(struct hdac_stream *hstream, bool code_loading)
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{
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struct hdac_ext_stream *hext_stream = stream_to_hdac_ext_stream(hstream);
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int ret;
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snd_hdac_ext_stream_decouple(hstream->bus, hext_stream, false);
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ret = snd_hdac_stream_setup(hstream, code_loading);
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snd_hdac_ext_stream_decouple(hstream->bus, hext_stream, true);
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return ret;
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}
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/**
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* snd_hdac_ext_stream_init - initialize each stream (aka device)
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* @bus: HD-audio core bus
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* @hext_stream: HD-audio ext core stream object to initialize
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* @idx: stream index number
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* @direction: stream direction (SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE)
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* @tag: the tag id to assign
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*
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* initialize the stream, if ppcap is enabled then init those and then
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* invoke hdac stream initialization routine
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*/
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static void snd_hdac_ext_stream_init(struct hdac_bus *bus,
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struct hdac_ext_stream *hext_stream,
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int idx, int direction, int tag)
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{
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if (bus->ppcap) {
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hext_stream->pphc_addr = bus->ppcap + AZX_PPHC_BASE +
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AZX_PPHC_INTERVAL * idx;
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hext_stream->pplc_addr = bus->ppcap + AZX_PPLC_BASE +
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AZX_PPLC_MULTI * bus->num_streams +
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AZX_PPLC_INTERVAL * idx;
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}
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hext_stream->decoupled = false;
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snd_hdac_stream_init(bus, &hext_stream->hstream, idx, direction, tag);
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}
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/**
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* snd_hdac_ext_stream_init_all - create and initialize the stream objects
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* for an extended hda bus
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* @bus: HD-audio core bus
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* @start_idx: start index for streams
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* @num_stream: number of streams to initialize
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* @dir: direction of streams
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*/
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int snd_hdac_ext_stream_init_all(struct hdac_bus *bus, int start_idx,
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int num_stream, int dir)
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{
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struct pci_dev *pci = to_pci_dev(bus->dev);
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int (*setup_op)(struct hdac_stream *, bool);
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int stream_tag = 0;
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int i, tag, idx = start_idx;
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if (pci->device == PCI_DEVICE_ID_INTEL_HDA_APL)
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setup_op = snd_hdac_apl_host_stream_setup;
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else
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setup_op = snd_hdac_stream_setup;
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for (i = 0; i < num_stream; i++) {
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struct hdac_ext_stream *hext_stream =
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kzalloc(sizeof(*hext_stream), GFP_KERNEL);
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if (!hext_stream)
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return -ENOMEM;
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tag = ++stream_tag;
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snd_hdac_ext_stream_init(bus, hext_stream, idx, dir, tag);
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idx++;
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hext_stream->host_setup = setup_op;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_init_all);
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/**
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* snd_hdac_ext_stream_free_all - free hdac extended stream objects
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*
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* @bus: HD-audio core bus
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*/
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void snd_hdac_ext_stream_free_all(struct hdac_bus *bus)
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{
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struct hdac_stream *s, *_s;
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struct hdac_ext_stream *hext_stream;
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list_for_each_entry_safe(s, _s, &bus->stream_list, list) {
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hext_stream = stream_to_hdac_ext_stream(s);
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snd_hdac_ext_stream_decouple(bus, hext_stream, false);
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list_del(&s->list);
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kfree(hext_stream);
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}
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_free_all);
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void snd_hdac_ext_stream_decouple_locked(struct hdac_bus *bus,
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struct hdac_ext_stream *hext_stream,
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bool decouple)
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{
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struct hdac_stream *hstream = &hext_stream->hstream;
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u32 val;
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int mask = AZX_PPCTL_PROCEN(hstream->index);
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val = readw(bus->ppcap + AZX_REG_PP_PPCTL) & mask;
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if (decouple && !val)
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snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, mask, mask);
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else if (!decouple && val)
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snd_hdac_updatel(bus->ppcap, AZX_REG_PP_PPCTL, mask, 0);
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hext_stream->decoupled = decouple;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_decouple_locked);
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/**
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* snd_hdac_ext_stream_decouple - decouple the hdac stream
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* @bus: HD-audio core bus
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* @hext_stream: HD-audio ext core stream object to initialize
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* @decouple: flag to decouple
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*/
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void snd_hdac_ext_stream_decouple(struct hdac_bus *bus,
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struct hdac_ext_stream *hext_stream, bool decouple)
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{
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spin_lock_irq(&bus->reg_lock);
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snd_hdac_ext_stream_decouple_locked(bus, hext_stream, decouple);
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spin_unlock_irq(&bus->reg_lock);
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_decouple);
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/**
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* snd_hdac_ext_stream_start - start a stream
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* @hext_stream: HD-audio ext core stream to start
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*/
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void snd_hdac_ext_stream_start(struct hdac_ext_stream *hext_stream)
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{
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snd_hdac_updatel(hext_stream->pplc_addr, AZX_REG_PPLCCTL,
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AZX_PPLCCTL_RUN, AZX_PPLCCTL_RUN);
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_start);
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/**
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* snd_hdac_ext_stream_clear - stop a stream DMA
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* @hext_stream: HD-audio ext core stream to stop
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*/
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void snd_hdac_ext_stream_clear(struct hdac_ext_stream *hext_stream)
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{
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snd_hdac_updatel(hext_stream->pplc_addr, AZX_REG_PPLCCTL, AZX_PPLCCTL_RUN, 0);
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_clear);
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/**
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* snd_hdac_ext_stream_reset - reset a stream
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* @hext_stream: HD-audio ext core stream to reset
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*/
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void snd_hdac_ext_stream_reset(struct hdac_ext_stream *hext_stream)
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{
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unsigned char val;
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int timeout;
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snd_hdac_ext_stream_clear(hext_stream);
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snd_hdac_updatel(hext_stream->pplc_addr, AZX_REG_PPLCCTL,
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AZX_PPLCCTL_STRST, AZX_PPLCCTL_STRST);
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udelay(3);
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timeout = 50;
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do {
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val = readl(hext_stream->pplc_addr + AZX_REG_PPLCCTL) &
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AZX_PPLCCTL_STRST;
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if (val)
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break;
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udelay(3);
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} while (--timeout);
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val &= ~AZX_PPLCCTL_STRST;
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writel(val, hext_stream->pplc_addr + AZX_REG_PPLCCTL);
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udelay(3);
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timeout = 50;
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/* waiting for hardware to report that the stream is out of reset */
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do {
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val = readl(hext_stream->pplc_addr + AZX_REG_PPLCCTL) & AZX_PPLCCTL_STRST;
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if (!val)
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break;
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udelay(3);
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} while (--timeout);
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_reset);
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/**
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* snd_hdac_ext_stream_setup - set up the SD for streaming
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* @hext_stream: HD-audio ext core stream to set up
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* @fmt: stream format
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*/
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int snd_hdac_ext_stream_setup(struct hdac_ext_stream *hext_stream, int fmt)
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{
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struct hdac_stream *hstream = &hext_stream->hstream;
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unsigned int val;
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/* make sure the run bit is zero for SD */
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snd_hdac_ext_stream_clear(hext_stream);
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/* program the stream_tag */
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val = readl(hext_stream->pplc_addr + AZX_REG_PPLCCTL);
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val = (val & ~AZX_PPLCCTL_STRM_MASK) |
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(hstream->stream_tag << AZX_PPLCCTL_STRM_SHIFT);
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writel(val, hext_stream->pplc_addr + AZX_REG_PPLCCTL);
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/* program the stream format */
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writew(fmt, hext_stream->pplc_addr + AZX_REG_PPLCFMT);
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return 0;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_setup);
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static struct hdac_ext_stream *
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hdac_ext_link_dma_stream_assign(struct hdac_bus *bus,
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struct snd_pcm_substream *substream)
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{
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struct hdac_ext_stream *res = NULL;
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struct hdac_stream *hstream = NULL;
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if (!bus->ppcap) {
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dev_err(bus->dev, "stream type not supported\n");
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return NULL;
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}
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spin_lock_irq(&bus->reg_lock);
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list_for_each_entry(hstream, &bus->stream_list, list) {
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struct hdac_ext_stream *hext_stream = container_of(hstream,
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struct hdac_ext_stream,
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hstream);
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if (hstream->direction != substream->stream)
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continue;
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/* check if link stream is available */
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if (!hext_stream->link_locked) {
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res = hext_stream;
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break;
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}
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}
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if (res) {
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snd_hdac_ext_stream_decouple_locked(bus, res, true);
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res->link_locked = 1;
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res->link_substream = substream;
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}
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spin_unlock_irq(&bus->reg_lock);
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return res;
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}
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static struct hdac_ext_stream *
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hdac_ext_host_dma_stream_assign(struct hdac_bus *bus,
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struct snd_pcm_substream *substream)
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{
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struct hdac_ext_stream *res = NULL;
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struct hdac_stream *hstream = NULL;
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if (!bus->ppcap) {
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dev_err(bus->dev, "stream type not supported\n");
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return NULL;
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}
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spin_lock_irq(&bus->reg_lock);
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list_for_each_entry(hstream, &bus->stream_list, list) {
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struct hdac_ext_stream *hext_stream = container_of(hstream,
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struct hdac_ext_stream,
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hstream);
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if (hstream->direction != substream->stream)
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continue;
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if (!hstream->opened) {
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res = hext_stream;
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break;
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}
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}
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if (res) {
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snd_hdac_ext_stream_decouple_locked(bus, res, true);
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res->hstream.opened = 1;
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res->hstream.running = 0;
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res->hstream.substream = substream;
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}
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spin_unlock_irq(&bus->reg_lock);
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return res;
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}
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/**
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* snd_hdac_ext_stream_assign - assign a stream for the PCM
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* @bus: HD-audio core bus
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* @substream: PCM substream to assign
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* @type: type of stream (coupled, host or link stream)
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*
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* This assigns the stream based on the type (coupled/host/link), for the
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* given PCM substream, assigns it and returns the stream object
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*
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* coupled: Looks for an unused stream
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* host: Looks for an unused decoupled host stream
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* link: Looks for an unused decoupled link stream
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*
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* If no stream is free, returns NULL. The function tries to keep using
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* the same stream object when it's used beforehand. when a stream is
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* decoupled, it becomes a host stream and link stream.
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*/
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struct hdac_ext_stream *snd_hdac_ext_stream_assign(struct hdac_bus *bus,
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struct snd_pcm_substream *substream,
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int type)
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{
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struct hdac_ext_stream *hext_stream = NULL;
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struct hdac_stream *hstream = NULL;
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switch (type) {
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case HDAC_EXT_STREAM_TYPE_COUPLED:
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hstream = snd_hdac_stream_assign(bus, substream);
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if (hstream)
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hext_stream = container_of(hstream,
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struct hdac_ext_stream,
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hstream);
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return hext_stream;
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case HDAC_EXT_STREAM_TYPE_HOST:
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return hdac_ext_host_dma_stream_assign(bus, substream);
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case HDAC_EXT_STREAM_TYPE_LINK:
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return hdac_ext_link_dma_stream_assign(bus, substream);
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default:
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return NULL;
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}
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_assign);
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/**
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* snd_hdac_ext_stream_release - release the assigned stream
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* @hext_stream: HD-audio ext core stream to release
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* @type: type of stream (coupled, host or link stream)
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*
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* Release the stream that has been assigned by snd_hdac_ext_stream_assign().
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*/
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void snd_hdac_ext_stream_release(struct hdac_ext_stream *hext_stream, int type)
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{
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struct hdac_bus *bus = hext_stream->hstream.bus;
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switch (type) {
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case HDAC_EXT_STREAM_TYPE_COUPLED:
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snd_hdac_stream_release(&hext_stream->hstream);
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break;
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case HDAC_EXT_STREAM_TYPE_HOST:
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spin_lock_irq(&bus->reg_lock);
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/* couple link only if not in use */
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if (!hext_stream->link_locked)
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snd_hdac_ext_stream_decouple_locked(bus, hext_stream, false);
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snd_hdac_stream_release_locked(&hext_stream->hstream);
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spin_unlock_irq(&bus->reg_lock);
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break;
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case HDAC_EXT_STREAM_TYPE_LINK:
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spin_lock_irq(&bus->reg_lock);
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/* couple host only if not in use */
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if (!hext_stream->hstream.opened)
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snd_hdac_ext_stream_decouple_locked(bus, hext_stream, false);
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hext_stream->link_locked = 0;
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hext_stream->link_substream = NULL;
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spin_unlock_irq(&bus->reg_lock);
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break;
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default:
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dev_dbg(bus->dev, "Invalid type %d\n", type);
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}
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_release);
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/**
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* snd_hdac_ext_cstream_assign - assign a host stream for compress
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* @bus: HD-audio core bus
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* @cstream: Compress stream to assign
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*
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* Assign an unused host stream for the given compress stream.
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* If no stream is free, NULL is returned. Stream is decoupled
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* before assignment.
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*/
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struct hdac_ext_stream *snd_hdac_ext_cstream_assign(struct hdac_bus *bus,
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struct snd_compr_stream *cstream)
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{
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struct hdac_ext_stream *res = NULL;
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struct hdac_stream *hstream;
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spin_lock_irq(&bus->reg_lock);
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list_for_each_entry(hstream, &bus->stream_list, list) {
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struct hdac_ext_stream *hext_stream = stream_to_hdac_ext_stream(hstream);
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if (hstream->direction != cstream->direction)
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continue;
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if (!hstream->opened) {
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res = hext_stream;
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break;
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}
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}
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if (res) {
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snd_hdac_ext_stream_decouple_locked(bus, res, true);
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res->hstream.opened = 1;
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res->hstream.running = 0;
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res->hstream.cstream = cstream;
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}
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spin_unlock_irq(&bus->reg_lock);
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return res;
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}
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EXPORT_SYMBOL_GPL(snd_hdac_ext_cstream_assign);
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