6aa7de0591
Please do not apply this to mainline directly, instead please re-run the coccinelle script shown below and apply its output. For several reasons, it is desirable to use {READ,WRITE}_ONCE() in preference to ACCESS_ONCE(), and new code is expected to use one of the former. So far, there's been no reason to change most existing uses of ACCESS_ONCE(), as these aren't harmful, and changing them results in churn. However, for some features, the read/write distinction is critical to correct operation. To distinguish these cases, separate read/write accessors must be used. This patch migrates (most) remaining ACCESS_ONCE() instances to {READ,WRITE}_ONCE(), using the following coccinelle script: ---- // Convert trivial ACCESS_ONCE() uses to equivalent READ_ONCE() and // WRITE_ONCE() // $ make coccicheck COCCI=/home/mark/once.cocci SPFLAGS="--include-headers" MODE=patch virtual patch @ depends on patch @ expression E1, E2; @@ - ACCESS_ONCE(E1) = E2 + WRITE_ONCE(E1, E2) @ depends on patch @ expression E; @@ - ACCESS_ONCE(E) + READ_ONCE(E) ---- Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: davem@davemloft.net Cc: linux-arch@vger.kernel.org Cc: mpe@ellerman.id.au Cc: shuah@kernel.org Cc: snitzer@redhat.com Cc: thor.thayer@linux.intel.com Cc: tj@kernel.org Cc: viro@zeniv.linux.org.uk Cc: will.deacon@arm.com Link: http://lkml.kernel.org/r/1508792849-3115-19-git-send-email-paulmck@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
186 lines
4.4 KiB
C
186 lines
4.4 KiB
C
/*
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* amdtp-tascam.c - a part of driver for TASCAM FireWire series
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*
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* Copyright (c) 2015 Takashi Sakamoto
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*
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* Licensed under the terms of the GNU General Public License, version 2.
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*/
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#include <sound/pcm.h>
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#include "tascam.h"
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#define AMDTP_FMT_TSCM_TX 0x1e
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#define AMDTP_FMT_TSCM_RX 0x3e
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struct amdtp_tscm {
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unsigned int pcm_channels;
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};
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int amdtp_tscm_set_parameters(struct amdtp_stream *s, unsigned int rate)
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{
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struct amdtp_tscm *p = s->protocol;
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unsigned int data_channels;
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if (amdtp_stream_running(s))
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return -EBUSY;
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data_channels = p->pcm_channels;
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/* Packets in in-stream have extra 2 data channels. */
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if (s->direction == AMDTP_IN_STREAM)
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data_channels += 2;
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return amdtp_stream_set_parameters(s, rate, data_channels);
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}
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static void write_pcm_s32(struct amdtp_stream *s,
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struct snd_pcm_substream *pcm,
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__be32 *buffer, unsigned int frames)
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{
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struct amdtp_tscm *p = s->protocol;
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struct snd_pcm_runtime *runtime = pcm->runtime;
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unsigned int channels, remaining_frames, i, c;
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const u32 *src;
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channels = p->pcm_channels;
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src = (void *)runtime->dma_area +
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frames_to_bytes(runtime, s->pcm_buffer_pointer);
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remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
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for (i = 0; i < frames; ++i) {
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for (c = 0; c < channels; ++c) {
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buffer[c] = cpu_to_be32(*src);
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src++;
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}
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buffer += s->data_block_quadlets;
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if (--remaining_frames == 0)
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src = (void *)runtime->dma_area;
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}
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}
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static void read_pcm_s32(struct amdtp_stream *s,
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struct snd_pcm_substream *pcm,
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__be32 *buffer, unsigned int frames)
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{
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struct amdtp_tscm *p = s->protocol;
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struct snd_pcm_runtime *runtime = pcm->runtime;
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unsigned int channels, remaining_frames, i, c;
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u32 *dst;
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channels = p->pcm_channels;
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dst = (void *)runtime->dma_area +
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frames_to_bytes(runtime, s->pcm_buffer_pointer);
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remaining_frames = runtime->buffer_size - s->pcm_buffer_pointer;
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/* The first data channel is for event counter. */
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buffer += 1;
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for (i = 0; i < frames; ++i) {
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for (c = 0; c < channels; ++c) {
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*dst = be32_to_cpu(buffer[c]);
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dst++;
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}
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buffer += s->data_block_quadlets;
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if (--remaining_frames == 0)
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dst = (void *)runtime->dma_area;
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}
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}
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static void write_pcm_silence(struct amdtp_stream *s, __be32 *buffer,
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unsigned int data_blocks)
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{
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struct amdtp_tscm *p = s->protocol;
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unsigned int channels, i, c;
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channels = p->pcm_channels;
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for (i = 0; i < data_blocks; ++i) {
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for (c = 0; c < channels; ++c)
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buffer[c] = 0x00000000;
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buffer += s->data_block_quadlets;
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}
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}
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int amdtp_tscm_add_pcm_hw_constraints(struct amdtp_stream *s,
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struct snd_pcm_runtime *runtime)
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{
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int err;
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/*
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* Our implementation allows this protocol to deliver 24 bit sample in
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* 32bit data channel.
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*/
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err = snd_pcm_hw_constraint_msbits(runtime, 0, 32, 24);
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if (err < 0)
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return err;
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return amdtp_stream_add_pcm_hw_constraints(s, runtime);
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}
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static unsigned int process_tx_data_blocks(struct amdtp_stream *s,
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__be32 *buffer,
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unsigned int data_blocks,
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unsigned int *syt)
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{
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struct snd_pcm_substream *pcm;
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pcm = READ_ONCE(s->pcm);
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if (data_blocks > 0 && pcm)
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read_pcm_s32(s, pcm, buffer, data_blocks);
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/* A place holder for control messages. */
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return data_blocks;
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}
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static unsigned int process_rx_data_blocks(struct amdtp_stream *s,
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__be32 *buffer,
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unsigned int data_blocks,
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unsigned int *syt)
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{
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struct snd_pcm_substream *pcm;
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/* This field is not used. */
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*syt = 0x0000;
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pcm = READ_ONCE(s->pcm);
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if (pcm)
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write_pcm_s32(s, pcm, buffer, data_blocks);
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else
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write_pcm_silence(s, buffer, data_blocks);
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return data_blocks;
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}
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int amdtp_tscm_init(struct amdtp_stream *s, struct fw_unit *unit,
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enum amdtp_stream_direction dir, unsigned int pcm_channels)
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{
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amdtp_stream_process_data_blocks_t process_data_blocks;
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struct amdtp_tscm *p;
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unsigned int fmt;
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int err;
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if (dir == AMDTP_IN_STREAM) {
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fmt = AMDTP_FMT_TSCM_TX;
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process_data_blocks = process_tx_data_blocks;
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} else {
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fmt = AMDTP_FMT_TSCM_RX;
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process_data_blocks = process_rx_data_blocks;
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}
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err = amdtp_stream_init(s, unit, dir,
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CIP_NONBLOCKING | CIP_SKIP_DBC_ZERO_CHECK, fmt,
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process_data_blocks, sizeof(struct amdtp_tscm));
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if (err < 0)
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return 0;
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/* Use fixed value for FDF field. */
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s->fdf = 0x00;
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/* This protocol uses fixed number of data channels for PCM samples. */
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p = s->protocol;
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p->pcm_channels = pcm_channels;
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return 0;
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}
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