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-rw-r--r--sound/firewire/fireface/ff-transaction.c232
1 files changed, 232 insertions, 0 deletions
diff --git a/sound/firewire/fireface/ff-transaction.c b/sound/firewire/fireface/ff-transaction.c
new file mode 100644
index 000000000..ee7122c46
--- /dev/null
+++ b/sound/firewire/fireface/ff-transaction.c
@@ -0,0 +1,232 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ff-transaction.c - a part of driver for RME Fireface series
+ *
+ * Copyright (c) 2015-2017 Takashi Sakamoto
+ */
+
+#include "ff.h"
+
+static void finish_transmit_midi_msg(struct snd_ff *ff, unsigned int port,
+ int rcode)
+{
+ struct snd_rawmidi_substream *substream =
+ READ_ONCE(ff->rx_midi_substreams[port]);
+
+ if (rcode_is_permanent_error(rcode)) {
+ ff->rx_midi_error[port] = true;
+ return;
+ }
+
+ if (rcode != RCODE_COMPLETE) {
+ /* Transfer the message again, immediately. */
+ ff->next_ktime[port] = 0;
+ schedule_work(&ff->rx_midi_work[port]);
+ return;
+ }
+
+ snd_rawmidi_transmit_ack(substream, ff->rx_bytes[port]);
+ ff->rx_bytes[port] = 0;
+
+ if (!snd_rawmidi_transmit_empty(substream))
+ schedule_work(&ff->rx_midi_work[port]);
+}
+
+static void finish_transmit_midi0_msg(struct fw_card *card, int rcode,
+ void *data, size_t length,
+ void *callback_data)
+{
+ struct snd_ff *ff =
+ container_of(callback_data, struct snd_ff, transactions[0]);
+ finish_transmit_midi_msg(ff, 0, rcode);
+}
+
+static void finish_transmit_midi1_msg(struct fw_card *card, int rcode,
+ void *data, size_t length,
+ void *callback_data)
+{
+ struct snd_ff *ff =
+ container_of(callback_data, struct snd_ff, transactions[1]);
+ finish_transmit_midi_msg(ff, 1, rcode);
+}
+
+static void transmit_midi_msg(struct snd_ff *ff, unsigned int port)
+{
+ struct snd_rawmidi_substream *substream =
+ READ_ONCE(ff->rx_midi_substreams[port]);
+ int quad_count;
+
+ struct fw_device *fw_dev = fw_parent_device(ff->unit);
+ unsigned long long addr;
+ int generation;
+ fw_transaction_callback_t callback;
+ int tcode;
+
+ if (substream == NULL || snd_rawmidi_transmit_empty(substream))
+ return;
+
+ if (ff->rx_bytes[port] > 0 || ff->rx_midi_error[port])
+ return;
+
+ /* Do it in next chance. */
+ if (ktime_after(ff->next_ktime[port], ktime_get())) {
+ schedule_work(&ff->rx_midi_work[port]);
+ return;
+ }
+
+ quad_count = ff->spec->protocol->fill_midi_msg(ff, substream, port);
+ if (quad_count <= 0)
+ return;
+
+ if (port == 0) {
+ addr = ff->spec->midi_rx_addrs[0];
+ callback = finish_transmit_midi0_msg;
+ } else {
+ addr = ff->spec->midi_rx_addrs[1];
+ callback = finish_transmit_midi1_msg;
+ }
+
+ /* Set interval to next transaction. */
+ ff->next_ktime[port] = ktime_add_ns(ktime_get(),
+ ff->rx_bytes[port] * 8 * (NSEC_PER_SEC / 31250));
+
+ if (quad_count == 1)
+ tcode = TCODE_WRITE_QUADLET_REQUEST;
+ else
+ tcode = TCODE_WRITE_BLOCK_REQUEST;
+
+ /*
+ * In Linux FireWire core, when generation is updated with memory
+ * barrier, node id has already been updated. In this module, After
+ * this smp_rmb(), load/store instructions to memory are completed.
+ * Thus, both of generation and node id are available with recent
+ * values. This is a light-serialization solution to handle bus reset
+ * events on IEEE 1394 bus.
+ */
+ generation = fw_dev->generation;
+ smp_rmb();
+ fw_send_request(fw_dev->card, &ff->transactions[port], tcode,
+ fw_dev->node_id, generation, fw_dev->max_speed,
+ addr, &ff->msg_buf[port], quad_count * 4,
+ callback, &ff->transactions[port]);
+}
+
+static void transmit_midi0_msg(struct work_struct *work)
+{
+ struct snd_ff *ff = container_of(work, struct snd_ff, rx_midi_work[0]);
+
+ transmit_midi_msg(ff, 0);
+}
+
+static void transmit_midi1_msg(struct work_struct *work)
+{
+ struct snd_ff *ff = container_of(work, struct snd_ff, rx_midi_work[1]);
+
+ transmit_midi_msg(ff, 1);
+}
+
+static void handle_midi_msg(struct fw_card *card, struct fw_request *request,
+ int tcode, int destination, int source,
+ int generation, unsigned long long offset,
+ void *data, size_t length, void *callback_data)
+{
+ struct snd_ff *ff = callback_data;
+ __le32 *buf = data;
+
+ fw_send_response(card, request, RCODE_COMPLETE);
+
+ offset -= ff->async_handler.offset;
+ ff->spec->protocol->handle_midi_msg(ff, (unsigned int)offset, buf,
+ length);
+}
+
+static int allocate_own_address(struct snd_ff *ff, int i)
+{
+ struct fw_address_region midi_msg_region;
+ int err;
+
+ ff->async_handler.length = ff->spec->midi_addr_range;
+ ff->async_handler.address_callback = handle_midi_msg;
+ ff->async_handler.callback_data = ff;
+
+ midi_msg_region.start = 0x000100000000ull * i;
+ midi_msg_region.end = midi_msg_region.start + ff->async_handler.length;
+
+ err = fw_core_add_address_handler(&ff->async_handler, &midi_msg_region);
+ if (err >= 0) {
+ /* Controllers are allowed to register this region. */
+ if (ff->async_handler.offset & 0x0000ffffffff) {
+ fw_core_remove_address_handler(&ff->async_handler);
+ err = -EAGAIN;
+ }
+ }
+
+ return err;
+}
+
+// Controllers are allowed to register higher 4 bytes of destination address to
+// receive asynchronous transactions for MIDI messages, while the way to
+// register lower 4 bytes of address is different depending on protocols. For
+// details, please refer to comments in protocol implementations.
+//
+// This driver expects userspace applications to configure registers for the
+// lower address because in most cases such registers has the other settings.
+int snd_ff_transaction_reregister(struct snd_ff *ff)
+{
+ struct fw_card *fw_card = fw_parent_device(ff->unit)->card;
+ u32 addr;
+ __le32 reg;
+
+ /*
+ * Controllers are allowed to register its node ID and upper 2 byte of
+ * local address to listen asynchronous transactions.
+ */
+ addr = (fw_card->node_id << 16) | (ff->async_handler.offset >> 32);
+ reg = cpu_to_le32(addr);
+ return snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
+ ff->spec->midi_high_addr,
+ &reg, sizeof(reg), 0);
+}
+
+int snd_ff_transaction_register(struct snd_ff *ff)
+{
+ int i, err;
+
+ /*
+ * Allocate in Memory Space of IEC 13213, but lower 4 byte in LSB should
+ * be zero due to device specification.
+ */
+ for (i = 0; i < 0xffff; i++) {
+ err = allocate_own_address(ff, i);
+ if (err != -EBUSY && err != -EAGAIN)
+ break;
+ }
+ if (err < 0)
+ return err;
+
+ err = snd_ff_transaction_reregister(ff);
+ if (err < 0)
+ return err;
+
+ INIT_WORK(&ff->rx_midi_work[0], transmit_midi0_msg);
+ INIT_WORK(&ff->rx_midi_work[1], transmit_midi1_msg);
+
+ return 0;
+}
+
+void snd_ff_transaction_unregister(struct snd_ff *ff)
+{
+ __le32 reg;
+
+ if (ff->async_handler.callback_data == NULL)
+ return;
+ ff->async_handler.callback_data = NULL;
+
+ /* Release higher 4 bytes of address. */
+ reg = cpu_to_le32(0x00000000);
+ snd_fw_transaction(ff->unit, TCODE_WRITE_QUADLET_REQUEST,
+ ff->spec->midi_high_addr,
+ &reg, sizeof(reg), 0);
+
+ fw_core_remove_address_handler(&ff->async_handler);
+}