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/*
* ff-protocol-ff800.c - a part of driver for RME Fireface series
*
* Copyright (c) 2018 Takashi Sakamoto
*
* Licensed under the terms of the GNU General Public License, version 2.
*/
#include <linux/delay.h>
#include "ff.h"
#define FF800_STF 0x0000fc88f000
#define FF800_RX_PACKET_FORMAT 0x0000fc88f004
#define FF800_ALLOC_TX_STREAM 0x0000fc88f008
#define FF800_ISOC_COMM_START 0x0000fc88f00c
#define FF800_TX_S800_FLAG 0x00000800
#define FF800_ISOC_COMM_STOP 0x0000fc88f010
#define FF800_TX_PACKET_ISOC_CH 0x0000801c0008
static int allocate_rx_resources(struct snd_ff *ff)
{
u32 data;
__le32 reg;
int err;
// Controllers should allocate isochronous resources for rx stream.
err = fw_iso_resources_allocate(&ff->rx_resources,
amdtp_stream_get_max_payload(&ff->rx_stream),
fw_parent_device(ff->unit)->max_speed);
if (err < 0)
return err;
// Set isochronous channel and the number of quadlets of rx packets.
data = ff->rx_stream.data_block_quadlets << 3;
data = (data << 8) | ff->rx_resources.channel;
reg = cpu_to_le32(data);
return snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
FF800_RX_PACKET_FORMAT, ®, sizeof(reg), 0);
}
static int allocate_tx_resources(struct snd_ff *ff)
{
__le32 reg;
unsigned int count;
unsigned int tx_isoc_channel;
int err;
reg = cpu_to_le32(ff->tx_stream.data_block_quadlets);
err = snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
FF800_ALLOC_TX_STREAM, ®, sizeof(reg), 0);
if (err < 0)
return err;
// Wait till the format of tx packet is available.
count = 0;
while (count++ < 10) {
u32 data;
err = snd_fw_transaction(ff->unit, TCODE_READ_QUADLET_REQUEST,
FF800_TX_PACKET_ISOC_CH, ®, sizeof(reg), 0);
if (err < 0)
return err;
data = le32_to_cpu(reg);
if (data != 0xffffffff) {
tx_isoc_channel = data;
break;
}
msleep(50);
}
if (count >= 10)
return -ETIMEDOUT;
// NOTE: this is a makeshift to start OHCI 1394 IR context in the
// channel. On the other hand, 'struct fw_iso_resources.allocated' is
// not true and it's not deallocated at stop.
ff->tx_resources.channel = tx_isoc_channel;
return 0;
}
static int ff800_begin_session(struct snd_ff *ff, unsigned int rate)
{
__le32 reg;
int err;
reg = cpu_to_le32(rate);
err = snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
FF800_STF, ®, sizeof(reg), 0);
if (err < 0)
return err;
// If starting isochronous communication immediately, change of STF has
// no effect. In this case, the communication runs based on former STF.
// Let's sleep for a bit.
msleep(100);
err = allocate_rx_resources(ff);
if (err < 0)
return err;
err = allocate_tx_resources(ff);
if (err < 0)
return err;
reg = cpu_to_le32(0x80000000);
reg |= cpu_to_le32(ff->tx_stream.data_block_quadlets);
if (fw_parent_device(ff->unit)->max_speed == SCODE_800)
reg |= cpu_to_le32(FF800_TX_S800_FLAG);
return snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
FF800_ISOC_COMM_START, ®, sizeof(reg), 0);
}
static void ff800_finish_session(struct snd_ff *ff)
{
__le32 reg;
reg = cpu_to_le32(0x80000000);
snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
FF800_ISOC_COMM_STOP, ®, sizeof(reg), 0);
}
static void ff800_handle_midi_msg(struct snd_ff *ff, __le32 *buf, size_t length)
{
int i;
for (i = 0; i < length / 4; i++) {
u8 byte = le32_to_cpu(buf[i]) & 0xff;
struct snd_rawmidi_substream *substream;
substream = READ_ONCE(ff->tx_midi_substreams[0]);
if (substream)
snd_rawmidi_receive(substream, &byte, 1);
}
}
const struct snd_ff_protocol snd_ff_protocol_ff800 = {
.handle_midi_msg = ff800_handle_midi_msg,
.begin_session = ff800_begin_session,
.finish_session = ff800_finish_session,
};
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