cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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digi00x-transaction.c (2231B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * digi00x-transaction.c - a part of driver for Digidesign Digi 002/003 family
      4 *
      5 * Copyright (c) 2014-2015 Takashi Sakamoto
      6 */
      7
      8#include <sound/asound.h>
      9#include "digi00x.h"
     10
     11static void handle_unknown_message(struct snd_dg00x *dg00x,
     12				   unsigned long long offset, __be32 *buf)
     13{
     14	unsigned long flags;
     15
     16	spin_lock_irqsave(&dg00x->lock, flags);
     17	dg00x->msg = be32_to_cpu(*buf);
     18	spin_unlock_irqrestore(&dg00x->lock, flags);
     19
     20	wake_up(&dg00x->hwdep_wait);
     21}
     22
     23static void handle_message(struct fw_card *card, struct fw_request *request,
     24			   int tcode, int destination, int source,
     25			   int generation, unsigned long long offset,
     26			   void *data, size_t length, void *callback_data)
     27{
     28	struct snd_dg00x *dg00x = callback_data;
     29	__be32 *buf = (__be32 *)data;
     30
     31	fw_send_response(card, request, RCODE_COMPLETE);
     32
     33	if (offset == dg00x->async_handler.offset)
     34		handle_unknown_message(dg00x, offset, buf);
     35}
     36
     37int snd_dg00x_transaction_reregister(struct snd_dg00x *dg00x)
     38{
     39	struct fw_device *device = fw_parent_device(dg00x->unit);
     40	__be32 data[2];
     41
     42	/* Unknown. 4bytes. */
     43	data[0] = cpu_to_be32((device->card->node_id << 16) |
     44			      (dg00x->async_handler.offset >> 32));
     45	data[1] = cpu_to_be32(dg00x->async_handler.offset);
     46	return snd_fw_transaction(dg00x->unit, TCODE_WRITE_BLOCK_REQUEST,
     47				  DG00X_ADDR_BASE + DG00X_OFFSET_MESSAGE_ADDR,
     48				  &data, sizeof(data), 0);
     49}
     50
     51void snd_dg00x_transaction_unregister(struct snd_dg00x *dg00x)
     52{
     53	if (dg00x->async_handler.callback_data == NULL)
     54		return;
     55
     56	fw_core_remove_address_handler(&dg00x->async_handler);
     57
     58	dg00x->async_handler.callback_data = NULL;
     59}
     60
     61int snd_dg00x_transaction_register(struct snd_dg00x *dg00x)
     62{
     63	static const struct fw_address_region resp_register_region = {
     64		.start	= 0xffffe0000000ull,
     65		.end	= 0xffffe000ffffull,
     66	};
     67	int err;
     68
     69	dg00x->async_handler.length = 4;
     70	dg00x->async_handler.address_callback = handle_message;
     71	dg00x->async_handler.callback_data = dg00x;
     72
     73	err = fw_core_add_address_handler(&dg00x->async_handler,
     74					  &resp_register_region);
     75	if (err < 0)
     76		return err;
     77
     78	err = snd_dg00x_transaction_reregister(dg00x);
     79	if (err < 0)
     80		snd_dg00x_transaction_unregister(dg00x);
     81
     82	return err;
     83}