2 * motu-transaction.c - a part of driver for MOTU FireWire series
4 * Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
6 * Licensed under the terms of the GNU General Public License, version 2.
12 #define SND_MOTU_ADDR_BASE 0xfffff0000000ULL
13 #define ASYNC_ADDR_HI 0x0b04
14 #define ASYNC_ADDR_LO 0x0b08
16 int snd_motu_transaction_read(struct snd_motu *motu, u32 offset, __be32 *reg,
21 if (size % sizeof(__be32) > 0 || size <= 0)
23 if (size == sizeof(__be32))
24 tcode = TCODE_READ_QUADLET_REQUEST;
26 tcode = TCODE_READ_BLOCK_REQUEST;
28 return snd_fw_transaction(motu->unit, tcode,
29 SND_MOTU_ADDR_BASE + offset, reg, size, 0);
32 int snd_motu_transaction_write(struct snd_motu *motu, u32 offset, __be32 *reg,
37 if (size % sizeof(__be32) > 0 || size <= 0)
39 if (size == sizeof(__be32))
40 tcode = TCODE_WRITE_QUADLET_REQUEST;
42 tcode = TCODE_WRITE_BLOCK_REQUEST;
44 return snd_fw_transaction(motu->unit, tcode,
45 SND_MOTU_ADDR_BASE + offset, reg, size, 0);
48 static void handle_message(struct fw_card *card, struct fw_request *request,
49 int tcode, int destination, int source,
50 int generation, unsigned long long offset,
51 void *data, size_t length, void *callback_data)
53 struct snd_motu *motu = callback_data;
54 __be32 *buf = (__be32 *)data;
57 if (tcode != TCODE_WRITE_QUADLET_REQUEST) {
58 fw_send_response(card, request, RCODE_COMPLETE);
62 if (offset != motu->async_handler.offset || length != 4) {
63 fw_send_response(card, request, RCODE_ADDRESS_ERROR);
67 spin_lock_irqsave(&motu->lock, flags);
68 motu->msg = be32_to_cpu(*buf);
69 spin_unlock_irqrestore(&motu->lock, flags);
71 fw_send_response(card, request, RCODE_COMPLETE);
73 wake_up(&motu->hwdep_wait);
76 int snd_motu_transaction_reregister(struct snd_motu *motu)
78 struct fw_device *device = fw_parent_device(motu->unit);
82 if (motu->async_handler.callback_data == NULL)
85 /* Register messaging address. Block transaction is not allowed. */
86 data = cpu_to_be32((device->card->node_id << 16) |
87 (motu->async_handler.offset >> 32));
88 err = snd_motu_transaction_write(motu, ASYNC_ADDR_HI, &data,
93 data = cpu_to_be32(motu->async_handler.offset);
94 return snd_motu_transaction_write(motu, ASYNC_ADDR_LO, &data,
98 int snd_motu_transaction_register(struct snd_motu *motu)
100 static const struct fw_address_region resp_register_region = {
101 .start = 0xffffe0000000ull,
102 .end = 0xffffe000ffffull,
106 /* Perhaps, 4 byte messages are transferred. */
107 motu->async_handler.length = 4;
108 motu->async_handler.address_callback = handle_message;
109 motu->async_handler.callback_data = motu;
111 err = fw_core_add_address_handler(&motu->async_handler,
112 &resp_register_region);
116 err = snd_motu_transaction_reregister(motu);
118 fw_core_remove_address_handler(&motu->async_handler);
119 motu->async_handler.address_callback = NULL;
125 void snd_motu_transaction_unregister(struct snd_motu *motu)
129 if (motu->async_handler.address_callback != NULL)
130 fw_core_remove_address_handler(&motu->async_handler);
131 motu->async_handler.address_callback = NULL;
133 /* Unregister the address. */
134 data = cpu_to_be32(0x00000000);
135 snd_motu_transaction_write(motu, ASYNC_ADDR_HI, &data, sizeof(data));
136 snd_motu_transaction_write(motu, ASYNC_ADDR_LO, &data, sizeof(data));