| 1 | /* |
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| 2 | * dev_dma.h - DMA (Direct Memory Access) generic device API definition. |
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| 3 | * |
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| 4 | * Authors Alain Greiner (2017) |
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| 5 | * |
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| 6 | * Copyright (c) UPMC Sorbonne Universites |
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| 7 | * |
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| 8 | * This file is part of ALMOS-MKH. |
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| 9 | * |
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| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it |
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| 11 | * under the terms of the GNU General Public License as published by |
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| 12 | * the Free Software Foundation; version 2.0 of the License. |
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| 13 | * |
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| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but |
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTDMALAR PURPOSE. See the GNU |
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| 17 | * General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation, |
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 22 | */ |
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| 23 | |
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| 24 | #ifndef _DEV_DMA_H_ |
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| 25 | #define _DEV_DMA_H_ |
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| 26 | |
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| 27 | #include <almos_config.h> |
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| 28 | #include <hal_types.h> |
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| 29 | #include <spinlock.h> |
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| 30 | |
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| 31 | /***************************************************************************************** |
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| 32 | * Generic Multi-channels DMA controller definition |
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| 33 | * |
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| 34 | * The DMA device describes a generic, multi-channels DMA controller, that can be used |
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| 35 | * by the kernel to speedup memory copies. It is an "internal" device, replicated in all |
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| 36 | * clusters. It can only be configured by a local kernel thread, but it can move data |
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| 37 | * to/from remote clusters. The burst size is defined by the cache line size. |
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| 38 | * Each DMA channel is described by a specific chdev descriptor, handling its private |
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| 39 | * waiting threads queue. |
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| 40 | * It implement one single command : move data from a (remote) source buffer |
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| 41 | * to a (remote) destination buffer. |
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| 42 | ****************************************************************************************/ |
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| 43 | |
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| 44 | /**** Forward declarations ****/ |
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| 45 | |
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| 46 | struct chdev_s; |
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| 47 | |
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| 48 | /***************************************************************************************** |
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| 49 | * This defines the (implementation independant) command passed to the driver. |
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| 50 | ****************************************************************************************/ |
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| 51 | |
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| 52 | typedef struct dma_command_s |
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| 53 | { |
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| 54 | xptr_t dev_xp; /*! extended pointer on the DMA chdev descriptor */ |
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| 55 | xptr_t src_xp; /*! extended pointer on source buffer. */ |
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| 56 | xptr_t dst_xp; /*! extended pointer on destination buffer. */ |
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| 57 | uint32_t size; /*! number of bytes to move. */ |
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| 58 | uint32_t error; /*! operation status (0 if success) */ |
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| 59 | } |
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| 60 | dma_command_t; |
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| 61 | |
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| 62 | /***************************************************************************************** |
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| 63 | * This enum defines the various implementations of the DMA internal interrupt controller. |
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| 64 | * This array must be kept consistent with the define in arch_info.h file |
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| 65 | ****************************************************************************************/ |
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| 66 | |
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| 67 | enum dma_impl_e |
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| 68 | { |
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| 69 | IMPL_DMA_SCL = 0, /* vci_xdma component used in TSAR */ |
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| 70 | IMPL_DMA_I86 = 1 /* TBD */ |
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| 71 | } |
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| 72 | dma_impl_t; |
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| 73 | |
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| 74 | /***************************************************************************************** |
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| 75 | * This function makes two initialisations: |
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| 76 | * - It initialises the DMA specific fields of the chdev descriptor. |
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| 77 | * - it initialises the implementation specific DMA hardware device and associated |
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| 78 | * data structures if required. |
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| 79 | * It must be called by a local thread. |
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| 80 | ***************************************************************************************** |
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| 81 | * @ chdev : pointer on DMA chdev descriptor. |
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| 82 | ****************************************************************************************/ |
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| 83 | void dev_dma_init( struct chdev_s * chdev ); |
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| 84 | |
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| 85 | /***************************************************************************************** |
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| 86 | * This blocking function register a DMA request in the device queue. |
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| 87 | * It uses a descheduling policy to wait completion, and return an error status |
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| 88 | * when the transfer is completed. |
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| 89 | ***************************************************************************************** |
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| 90 | * @ dst : extended pointer on destination buffer. |
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| 91 | * @ src : extended pointer on Rsource buffer. |
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| 92 | * @ size : number of bytes to move. |
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| 93 | ****************************************************************************************/ |
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| 94 | error_t dev_dma_remote_memcpy( xptr_t dst_xp, |
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| 95 | xptr_t src_xp, |
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| 96 | uint32_t size ); |
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| 97 | |
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| 98 | |
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| 99 | #endif /* _DEV_DMA_H_ */ |
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