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Diffstat (limited to 'arch/powerpc/include/asm/async_tx.h')
| -rw-r--r-- | arch/powerpc/include/asm/async_tx.h | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/async_tx.h b/arch/powerpc/include/asm/async_tx.h new file mode 100644 index 00000000000..6b49cf1f702 --- /dev/null +++ b/arch/powerpc/include/asm/async_tx.h @@ -0,0 +1,88 @@ +/* + * 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 |