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/*
* Copyright(c) 2008 DENX Engineering. All rights reserved.
*
* Author: Yuri Tikhonov <yur@emcraft.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The full GNU General Public License is included in this distribution in the
* file called COPYING.
*/
#ifndef _PPC_ASYNC_TX_H_
#define _PPC_ASYNC_TX_H_
#if defined(CONFIG_440SPe) || defined(CONFIG_440SP)
extern int ppc440spe_adma_estimate (struct dma_chan *chan,
enum dma_transaction_type cap, struct page **src_lst,
int src_cnt, size_t src_sz);
#define ppc_adma_estimate(chan, cap, src_lst, src_cnt, src_sz) \
ppc440spe_adma_estimate(chan, cap, src_lst, src_cnt, src_sz)
#elif defined(CONFIG_460EX) || defined(CONFIG_460GT)
extern int ppc460ex_adma_estimate (struct dma_chan *chan,
enum dma_transaction_type cap, struct page **src_lst,
int src_cnt, size_t src_sz);
#define ppc_adma_estimate(chan, cap, src_lst, src_cnt, src_sz) \
ppc460ex_adma_estimate(chan, cap, src_lst, src_cnt, src_sz)
#elif defined(CONFIG_APM82181)
extern int apm82181_adma_estimate (struct dma_chan *chan,
enum dma_transaction_type cap, struct page **src_lst,
int src_cnt, size_t src_sz);
#define ppc_adma_estimate(chan, cap, src_lst, src_cnt, src_sz) \
apm82181_adma_estimate(chan, cap, src_lst, src_cnt, src_sz)
#endif
struct ppc_dma_chan_ref {
struct dma_chan *chan;
struct list_head node;
};
extern struct list_head ppc_adma_chan_list;
/**
* ppc_async_tx_find_best_channel - find a channel with the maximum rank for the
* transaction type given (the rank of the operation is the value
* returned by the device_estimate method).
* @cap: transaction type
* @src_lst: array of pointers to sources for the transaction
* @src_cnt: number of arguments (size of the srcs array)
* @src_sz: length of the each argument pointed by srcs
*/
static inline struct dma_chan *
ppc_async_tx_find_best_channel (enum dma_transaction_type cap,
struct page **src_lst, int src_cnt, size_t src_sz)
{
struct dma_chan *best_chan = NULL;
struct ppc_dma_chan_ref *ref;
int best_rank = -1;
list_for_each_entry(ref, &ppc_adma_chan_list, node)
if (dma_has_cap(cap, ref->chan->device->cap_mask)) {
int rank;
rank = ppc_adma_estimate (ref->chan,
cap, src_lst, src_cnt, src_sz);
if (rank > best_rank) {
best_rank = rank;
best_chan = ref->chan;
}
}
return best_chan;
}
#define async_tx_find_channel(dep, type, dst, dst_count, src, src_count, len) \
ppc_async_tx_find_best_channel(type, src, src_count, len)
#endif
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