137 lines
3.5 KiB
C
137 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* motu-transaction.c - a part of driver for MOTU FireWire series
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*
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* Copyright (c) 2015-2017 Takashi Sakamoto <o-takashi@sakamocchi.jp>
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*/
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#include "motu.h"
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#define SND_MOTU_ADDR_BASE 0xfffff0000000ULL
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#define ASYNC_ADDR_HI 0x0b04
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#define ASYNC_ADDR_LO 0x0b08
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int snd_motu_transaction_read(struct snd_motu *motu, u32 offset, __be32 *reg,
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size_t size)
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{
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int tcode;
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if (size % sizeof(__be32) > 0 || size <= 0)
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return -EINVAL;
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if (size == sizeof(__be32))
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tcode = TCODE_READ_QUADLET_REQUEST;
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else
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tcode = TCODE_READ_BLOCK_REQUEST;
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return snd_fw_transaction(motu->unit, tcode,
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SND_MOTU_ADDR_BASE + offset, reg, size, 0);
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}
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int snd_motu_transaction_write(struct snd_motu *motu, u32 offset, __be32 *reg,
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size_t size)
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{
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int tcode;
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if (size % sizeof(__be32) > 0 || size <= 0)
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return -EINVAL;
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if (size == sizeof(__be32))
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tcode = TCODE_WRITE_QUADLET_REQUEST;
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else
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tcode = TCODE_WRITE_BLOCK_REQUEST;
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return snd_fw_transaction(motu->unit, tcode,
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SND_MOTU_ADDR_BASE + offset, reg, size, 0);
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}
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static void handle_message(struct fw_card *card, struct fw_request *request,
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int tcode, int destination, int source,
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int generation, unsigned long long offset,
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void *data, size_t length, void *callback_data)
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{
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struct snd_motu *motu = callback_data;
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__be32 *buf = (__be32 *)data;
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unsigned long flags;
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if (tcode != TCODE_WRITE_QUADLET_REQUEST) {
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fw_send_response(card, request, RCODE_COMPLETE);
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return;
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}
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if (offset != motu->async_handler.offset || length != 4) {
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fw_send_response(card, request, RCODE_ADDRESS_ERROR);
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return;
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}
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spin_lock_irqsave(&motu->lock, flags);
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motu->msg = be32_to_cpu(*buf);
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spin_unlock_irqrestore(&motu->lock, flags);
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fw_send_response(card, request, RCODE_COMPLETE);
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wake_up(&motu->hwdep_wait);
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}
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int snd_motu_transaction_reregister(struct snd_motu *motu)
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{
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struct fw_device *device = fw_parent_device(motu->unit);
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__be32 data;
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int err;
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if (motu->async_handler.callback_data == NULL)
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return -EINVAL;
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/* Register messaging address. Block transaction is not allowed. */
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data = cpu_to_be32((device->card->node_id << 16) |
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(motu->async_handler.offset >> 32));
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err = snd_motu_transaction_write(motu, ASYNC_ADDR_HI, &data,
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sizeof(data));
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if (err < 0)
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return err;
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data = cpu_to_be32(motu->async_handler.offset);
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return snd_motu_transaction_write(motu, ASYNC_ADDR_LO, &data,
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sizeof(data));
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}
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int snd_motu_transaction_register(struct snd_motu *motu)
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{
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static const struct fw_address_region resp_register_region = {
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.start = 0xffffe0000000ull,
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.end = 0xffffe000ffffull,
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};
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int err;
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/* Perhaps, 4 byte messages are transferred. */
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motu->async_handler.length = 4;
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motu->async_handler.address_callback = handle_message;
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motu->async_handler.callback_data = motu;
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err = fw_core_add_address_handler(&motu->async_handler,
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&resp_register_region);
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if (err < 0)
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return err;
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err = snd_motu_transaction_reregister(motu);
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if (err < 0) {
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fw_core_remove_address_handler(&motu->async_handler);
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motu->async_handler.address_callback = NULL;
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}
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return err;
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}
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void snd_motu_transaction_unregister(struct snd_motu *motu)
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{
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__be32 data;
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if (motu->async_handler.address_callback != NULL)
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fw_core_remove_address_handler(&motu->async_handler);
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motu->async_handler.address_callback = NULL;
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/* Unregister the address. */
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data = cpu_to_be32(0x00000000);
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snd_motu_transaction_write(motu, ASYNC_ADDR_HI, &data, sizeof(data));
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snd_motu_transaction_write(motu, ASYNC_ADDR_LO, &data, sizeof(data));
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}
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