| [3] | 1 | /* |
|---|
| 2 | * dev_dma.h - DMA (Direct Memory Access) generic device API definition. |
|---|
| 3 | * |
|---|
| [437] | 4 | * Authors Alain Greiner (2016,2017,2018) |
|---|
| [3] | 5 | * |
|---|
| 6 | * Copyright (c) UPMC Sorbonne Universites |
|---|
| 7 | * |
|---|
| 8 | * This file is part of ALMOS-MKH. |
|---|
| 9 | * |
|---|
| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
|---|
| 11 | * under the terms of the GNU General Public License as published by |
|---|
| 12 | * the Free Software Foundation; version 2.0 of the License. |
|---|
| 13 | * |
|---|
| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
|---|
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
|---|
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTDMALAR PURPOSE. See the GNU |
|---|
| 17 | * General Public License for more details. |
|---|
| 18 | * |
|---|
| 19 | * You should have received a copy of the GNU General Public License |
|---|
| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
|---|
| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
|---|
| 22 | */ |
|---|
| 23 | |
|---|
| 24 | #ifndef _DEV_DMA_H_ |
|---|
| 25 | #define _DEV_DMA_H_ |
|---|
| 26 | |
|---|
| [14] | 27 | #include <kernel_config.h> |
|---|
| [457] | 28 | #include <hal_kernel_types.h> |
|---|
| [3] | 29 | |
|---|
| 30 | /***************************************************************************************** |
|---|
| 31 | * Generic Multi-channels DMA controller definition |
|---|
| 32 | * |
|---|
| 33 | * The DMA device describes a generic, multi-channels DMA controller, that can be used |
|---|
| 34 | * by the kernel to speedup memory copies. It is an "internal" device, replicated in all |
|---|
| 35 | * clusters. It can only be configured by a local kernel thread, but it can move data |
|---|
| 36 | * to/from remote clusters. The burst size is defined by the cache line size. |
|---|
| 37 | * Each DMA channel is described by a specific chdev descriptor, handling its private |
|---|
| [647] | 38 | * waiting threads queue. It implement one single command : move data from a (remote) |
|---|
| 39 | * source buffer to a (remote) destination buffer. |
|---|
| [3] | 40 | ****************************************************************************************/ |
|---|
| 41 | |
|---|
| 42 | /**** Forward declarations ****/ |
|---|
| 43 | |
|---|
| 44 | struct chdev_s; |
|---|
| 45 | |
|---|
| 46 | /***************************************************************************************** |
|---|
| 47 | * This defines the (implementation independant) command passed to the driver. |
|---|
| 48 | ****************************************************************************************/ |
|---|
| 49 | |
|---|
| 50 | typedef struct dma_command_s |
|---|
| 51 | { |
|---|
| 52 | xptr_t dev_xp; /*! extended pointer on the DMA chdev descriptor */ |
|---|
| 53 | xptr_t src_xp; /*! extended pointer on source buffer. */ |
|---|
| 54 | xptr_t dst_xp; /*! extended pointer on destination buffer. */ |
|---|
| 55 | uint32_t size; /*! number of bytes to move. */ |
|---|
| 56 | uint32_t error; /*! operation status (0 if success) */ |
|---|
| 57 | } |
|---|
| 58 | dma_command_t; |
|---|
| 59 | |
|---|
| 60 | /***************************************************************************************** |
|---|
| 61 | * This enum defines the various implementations of the DMA internal interrupt controller. |
|---|
| 62 | * This array must be kept consistent with the define in arch_info.h file |
|---|
| 63 | ****************************************************************************************/ |
|---|
| 64 | |
|---|
| 65 | enum dma_impl_e |
|---|
| 66 | { |
|---|
| 67 | IMPL_DMA_SCL = 0, /* vci_xdma component used in TSAR */ |
|---|
| 68 | IMPL_DMA_I86 = 1 /* TBD */ |
|---|
| 69 | } |
|---|
| 70 | dma_impl_t; |
|---|
| 71 | |
|---|
| 72 | /***************************************************************************************** |
|---|
| 73 | * This function makes two initialisations: |
|---|
| 74 | * - It initialises the DMA specific fields of the chdev descriptor. |
|---|
| 75 | * - it initialises the implementation specific DMA hardware device and associated |
|---|
| 76 | * data structures if required. |
|---|
| 77 | * It must be called by a local thread. |
|---|
| 78 | ***************************************************************************************** |
|---|
| 79 | * @ chdev : pointer on DMA chdev descriptor. |
|---|
| 80 | ****************************************************************************************/ |
|---|
| 81 | void dev_dma_init( struct chdev_s * chdev ); |
|---|
| 82 | |
|---|
| 83 | /***************************************************************************************** |
|---|
| 84 | * This blocking function register a DMA request in the device queue. |
|---|
| 85 | * It uses a descheduling policy to wait completion, and return an error status |
|---|
| 86 | * when the transfer is completed. |
|---|
| 87 | ***************************************************************************************** |
|---|
| 88 | * @ dst : extended pointer on destination buffer. |
|---|
| 89 | * @ src : extended pointer on Rsource buffer. |
|---|
| 90 | * @ size : number of bytes to move. |
|---|
| 91 | ****************************************************************************************/ |
|---|
| 92 | error_t dev_dma_remote_memcpy( xptr_t dst_xp, |
|---|
| 93 | xptr_t src_xp, |
|---|
| 94 | uint32_t size ); |
|---|
| 95 | |
|---|
| 96 | |
|---|
| 97 | #endif /* _DEV_DMA_H_ */ |
|---|
