Based on kernel version 4.7.2. Page generated on 2016-08-22 22:47 EST.
1 RapidIO subsystem mport driver for IDT Tsi721 PCI Express-to-SRIO bridge. 2 ========================================================================= 3 4 I. Overview 5 6 This driver implements all currently defined RapidIO mport callback functions. 7 It supports maintenance read and write operations, inbound and outbound RapidIO 8 doorbells, inbound maintenance port-writes and RapidIO messaging. 9 10 To generate SRIO maintenance transactions this driver uses one of Tsi721 DMA 11 channels. This mechanism provides access to larger range of hop counts and 12 destination IDs without need for changes in outbound window translation. 13 14 RapidIO messaging support uses dedicated messaging channels for each mailbox. 15 For inbound messages this driver uses destination ID matching to forward messages 16 into the corresponding message queue. Messaging callbacks are implemented to be 17 fully compatible with RIONET driver (Ethernet over RapidIO messaging services). 18 19 1. Module parameters: 20 - 'dbg_level' - This parameter allows to control amount of debug information 21 generated by this device driver. This parameter is formed by set of 22 This parameter can be changed bit masks that correspond to the specific 23 functional block. 24 For mask definitions see 'drivers/rapidio/devices/tsi721.h' 25 This parameter can be changed dynamically. 26 Use CONFIG_RAPIDIO_DEBUG=y to enable debug output at the top level. 27 28 II. Known problems 29 30 None. 31 32 III. DMA Engine Support 33 34 Tsi721 mport driver supports DMA data transfers between local system memory and 35 remote RapidIO devices. This functionality is implemented according to SLAVE 36 mode API defined by common Linux kernel DMA Engine framework. 37 38 Depending on system requirements RapidIO DMA operations can be included/excluded 39 by setting CONFIG_RAPIDIO_DMA_ENGINE option. Tsi721 miniport driver uses seven 40 out of eight available BDMA channels to support DMA data transfers. 41 One BDMA channel is reserved for generation of maintenance read/write requests. 42 43 If Tsi721 mport driver have been built with RAPIDIO_DMA_ENGINE support included, 44 this driver will accept DMA-specific module parameter: 45 "dma_desc_per_channel" - defines number of hardware buffer descriptors used by 46 each BDMA channel of Tsi721 (by default - 128). 47 48 IV. Version History 49 50 1.1.0 - DMA operations re-worked to support data scatter/gather lists larger 51 than hardware buffer descriptors ring. 52 1.0.0 - Initial driver release. 53 54 V. License 55 ----------------------------------------------- 56 57 Copyright(c) 2011 Integrated Device Technology, Inc. All rights reserved. 58 59 This program is free software; you can redistribute it and/or modify it 60 under the terms of the GNU General Public License as published by the Free 61 Software Foundation; either version 2 of the License, or (at your option) 62 any later version. 63 64 This program is distributed in the hope that it will be useful, but WITHOUT 65 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 66 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 67 more details. 68 69 You should have received a copy of the GNU General Public License along with 70 this program; if not, write to the Free Software Foundation, Inc., 71 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.