[258] | 1 | /////////////////////////////////////////////////////////////////////////////////// |
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| 2 | // File : dma_driver.c |
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| 3 | // Date : 23/11/2013 |
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| 4 | // Author : alain greiner |
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| 5 | // Copyright (c) UPMC-LIP6 |
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| 6 | /////////////////////////////////////////////////////////////////////////////////// |
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| 7 | // The dma_driver.c and dma_driver.h files are part ot the GIET-VM nano-kernel. |
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| 8 | // This driver supports the SoCLib vci_multi_dma component. |
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| 9 | // |
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| 10 | // It can exist several DMA controlers in the architecture (one per cluster), |
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| 11 | // and each controller can contain several channels. |
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| 12 | // |
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| 13 | // There is (NB_CLUSTERS * NB_DMA_CHANNELS) channels, indexed by a global index: |
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[263] | 14 | // dma_id = cluster_xy * NB_DMA_CHANNELS + loc_id |
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[258] | 15 | // |
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| 16 | // A DMA channel is a private ressource allocated to a given processor. |
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| 17 | // It is exclusively used by the kernet to speedup data transfers, and |
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| 18 | // there is no lock protecting exclusive access to the channel. |
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| 19 | // As the kernel uses a polling policy on the DMA_STATUS register to detect |
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[320] | 20 | // transfer completion, the DMA IRQ is not used. |
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| 21 | // |
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[258] | 22 | // The virtual base address of the segment associated to a channel is: |
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[333] | 23 | // SEG_DMA_BASE + cluster_xy * PERI_CLUSTER_INCREMENT + DMA_SPAN * channel_id |
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[258] | 24 | // |
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[320] | 25 | // The SEG_DMA_BASE virtual address mus be defined in the hard_config.h file. |
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[258] | 26 | //////////////////////////////////////////////////////////////////////////////////// |
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| 27 | |
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| 28 | #include <giet_config.h> |
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[320] | 29 | #include <hard_config.h> |
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[258] | 30 | #include <dma_driver.h> |
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| 31 | #include <tty_driver.h> |
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| 32 | #include <vmem.h> |
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[320] | 33 | #include <utils.h> |
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[345] | 34 | #include <io.h> |
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[258] | 35 | |
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[263] | 36 | #if !defined(X_SIZE) |
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| 37 | # error: You must define X_SIZE in the hard_config.h file |
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[258] | 38 | #endif |
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| 39 | |
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[263] | 40 | #if !defined(Y_SIZE) |
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| 41 | # error: You must define X_SIZE in the hard_config.h file |
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[258] | 42 | #endif |
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| 43 | |
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[263] | 44 | #if !defined(X_WIDTH) |
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| 45 | # error: You must define X_WIDTH in the hard_config.h file |
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[258] | 46 | #endif |
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| 47 | |
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[263] | 48 | #if !defined(Y_WIDTH) |
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| 49 | # error: You must define X_WIDTH in the hard_config.h file |
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[258] | 50 | #endif |
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| 51 | |
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[263] | 52 | #if !defined(NB_DMA_CHANNELS) |
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| 53 | # error: You must define NB_DMA_CHANNELS in the hard_config.h file |
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[258] | 54 | #endif |
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| 55 | |
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[320] | 56 | #if !defined(SEG_DMA_BASE) |
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| 57 | # error: You must define SEG_DMA_BASE in the hard_config.h file |
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| 58 | #endif |
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| 59 | |
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[333] | 60 | #if !defined(PERI_CLUSTER_INCREMENT) |
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| 61 | # error: You must define PERI_CLUSTER_INCREMENT in the hard_config.h file |
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[320] | 62 | #endif |
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| 63 | |
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[345] | 64 | extern volatile unsigned int _ptabs_vaddr[]; |
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[258] | 65 | |
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[345] | 66 | /////////////////////////////////////////////////////////////////////////////// |
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| 67 | // This low level function returns the value contained in register "index" |
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| 68 | // in the DMA component contained in cluster "cluster_xy" |
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| 69 | /////////////////////////////////////////////////////////////////////////////// |
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| 70 | static |
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| 71 | unsigned int _dma_get_register( unsigned int cluster_xy, // cluster index |
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| 72 | unsigned int channel_id, // channel index |
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| 73 | unsigned int index ) // register index |
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| 74 | { |
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| 75 | unsigned int vaddr = |
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| 76 | SEG_DMA_BASE + |
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| 77 | (cluster_xy * PERI_CLUSTER_INCREMENT) + |
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| 78 | (channel_id * DMA_SPAN) + |
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| 79 | (index << 2); |
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| 80 | |
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| 81 | return ioread32( (void*)vaddr ); |
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| 82 | } |
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| 83 | |
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| 84 | /////////////////////////////////////////////////////////////////////////////// |
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| 85 | // This low level function sets a new value in register "index" |
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| 86 | // in the DMA component contained in cluster "cluster_xy" |
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| 87 | /////////////////////////////////////////////////////////////////////////////// |
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| 88 | static |
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| 89 | void _dma_set_register( unsigned int cluster_xy, // cluster index |
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| 90 | unsigned int channel_id, // channel index |
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| 91 | unsigned int index, // register index |
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| 92 | unsigned int value ) // value to be written |
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| 93 | { |
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| 94 | unsigned int vaddr = |
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| 95 | SEG_DMA_BASE + |
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| 96 | (cluster_xy * PERI_CLUSTER_INCREMENT) + |
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| 97 | (channel_id * DMA_SPAN) + |
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| 98 | (index << 2); |
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| 99 | |
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| 100 | iowrite32( (void*)vaddr, value ); |
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| 101 | } |
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| 102 | |
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[258] | 103 | ////////////////////////////////////////////////////////////////////////////////// |
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| 104 | // AS the GIET-VM uses a polling policy to detect transfer completion, |
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| 105 | // The DMA component initialisation must disable interrupts. |
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| 106 | // This function disables interrupts for one DMA channel in one cluster. |
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| 107 | // Returns 0 if success, returns > 0 if error. |
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| 108 | ////////////////////////////////////////////////////////////////////////////////// |
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[263] | 109 | unsigned int _dma_init( unsigned int cluster_xy, |
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[258] | 110 | unsigned int channel_id ) |
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| 111 | { |
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| 112 | #if NB_DMA_CHANNELS > 0 |
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[263] | 113 | |
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[258] | 114 | // parameters checking |
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[263] | 115 | unsigned int x = cluster_xy >> Y_WIDTH; |
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| 116 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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| 117 | if (x >= X_SIZE) return 1; |
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| 118 | if (y >= Y_SIZE) return 1; |
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[258] | 119 | if (channel_id >= NB_DMA_CHANNELS) return 1; |
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| 120 | |
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| 121 | // disable interrupt for selected channel |
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[345] | 122 | _dma_set_register(cluster_xy, channel_id, DMA_IRQ_DISABLE, 1); |
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[258] | 123 | return 0; |
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| 124 | #else |
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| 125 | return 1; |
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| 126 | #endif |
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| 127 | } |
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| 128 | |
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| 129 | ////////////////////////////////////////////////////////////////////////////////// |
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| 130 | // This function re-initialises one DMA channel in one cluster after a transfer |
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| 131 | // completion. It actually forces the channel to return in iDLE state. |
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| 132 | ////////////////////////////////////////////////////////////////////////////////// |
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[263] | 133 | unsigned int _dma_reset( unsigned int cluster_xy, |
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[258] | 134 | unsigned int channel_id ) |
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| 135 | { |
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| 136 | #if NB_DMA_CHANNELS > 0 |
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[263] | 137 | |
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[258] | 138 | // parameters checking |
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[263] | 139 | unsigned int x = cluster_xy >> Y_WIDTH; |
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| 140 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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| 141 | if (x >= X_SIZE) return 1; |
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| 142 | if (y >= Y_SIZE) return 1; |
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[258] | 143 | if (channel_id >= NB_DMA_CHANNELS) return 1; |
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| 144 | |
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| 145 | // reset selected channel |
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[345] | 146 | _dma_set_register(cluster_xy, channel_id, DMA_RESET, 0); |
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[258] | 147 | return 0; |
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| 148 | #else |
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| 149 | return 1; |
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| 150 | #endif |
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| 151 | } |
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| 152 | |
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| 153 | ////////////////////////////////////////////////////////////////////////////////// |
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| 154 | // This function returns the status of a DMA channel in a given cluster |
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| 155 | ////////////////////////////////////////////////////////////////////////////////// |
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[263] | 156 | unsigned int _dma_get_status( unsigned int cluster_xy, |
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[258] | 157 | unsigned int channel_id ) |
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| 158 | { |
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| 159 | #if NB_DMA_CHANNELS > 0 |
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[263] | 160 | |
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[258] | 161 | // parameters checking |
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[263] | 162 | unsigned int x = cluster_xy >> Y_WIDTH; |
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| 163 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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| 164 | if (x >= X_SIZE) return 1; |
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| 165 | if (y >= Y_SIZE) return 1; |
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[258] | 166 | if (channel_id >= NB_DMA_CHANNELS) return 1; |
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| 167 | |
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| 168 | // get selected channel status |
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[345] | 169 | return _dma_get_register(cluster_xy, channel_id, DMA_LEN); |
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[258] | 170 | #else |
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[267] | 171 | return DMA_IDLE; |
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[258] | 172 | #endif |
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| 173 | } |
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| 174 | |
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| 175 | ////////////////////////////////////////////////////////////////////////////////// |
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| 176 | // This function sets the physical address (including 64 bits extension) |
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| 177 | // for the source and destination buffers in a DMA channel in a given cluster |
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| 178 | // and sets the transfer size to lauch the transfer. |
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| 179 | ////////////////////////////////////////////////////////////////////////////////// |
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[343] | 180 | void _dma_start_transfer( unsigned int cluster_xy, // DMA cluster |
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| 181 | unsigned int channel_id, // DMA channel |
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| 182 | unsigned long long dst_paddr, // physical address |
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| 183 | unsigned long long src_paddr, // physical address |
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| 184 | unsigned int size ) // bytes |
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[258] | 185 | { |
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| 186 | #if NB_DMA_CHANNELS > 0 |
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[263] | 187 | |
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[258] | 188 | // selected channel configuration and lauching |
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[345] | 189 | _dma_set_register(cluster_xy, channel_id, DMA_SRC, |
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| 190 | (unsigned int)(src_paddr)); |
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| 191 | _dma_set_register(cluster_xy, channel_id, DMA_SRC_EXT, |
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| 192 | (unsigned int)(src_paddr>>32)); |
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| 193 | _dma_set_register(cluster_xy, channel_id, DMA_DST, |
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| 194 | (unsigned int)(dst_paddr)); |
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| 195 | _dma_set_register(cluster_xy, channel_id, DMA_DST_EXT, |
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| 196 | (unsigned int)(dst_paddr>>32)); |
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| 197 | _dma_set_register(cluster_xy, channel_id, DMA_LEN, |
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| 198 | (unsigned int)size); |
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[343] | 199 | |
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[258] | 200 | #endif |
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| 201 | } |
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[343] | 202 | |
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[258] | 203 | /////////////////////////////////////////////////////////////////////////////////// |
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[343] | 204 | // This function copies a source memory buffer to a destination memory buffer, |
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| 205 | // using directly physical addresses. |
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| 206 | // This blocking function is supposed to be used by the kernel only, |
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| 207 | // and uses a polling policy on DMA_STATUS register to detect completion. |
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| 208 | // Therefore, the DMA_IRQ is NOT used. |
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[258] | 209 | // The source and destination buffers base addresses must be word aligned, |
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| 210 | // and the buffer's size must be multiple of 4. |
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| 211 | // In case of error (buffer unmapped, unaligned, or DMA_STATUS error), an error |
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| 212 | // message is displayed on TTY0, and the system crash. |
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| 213 | /////////////////////////////////////////////////////////////////////////////////// |
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[343] | 214 | void _dma_physical_copy( unsigned int cluster_xy, // DMA cluster |
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| 215 | unsigned int channel_id, // DMA channel |
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| 216 | unsigned long long dst_paddr, // destination physical address |
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| 217 | unsigned long long src_paddr, // source physical address |
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| 218 | unsigned int size ) // bytes |
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| 219 | { |
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| 220 | #if NB_DMA_CHANNELS > 0 |
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| 221 | |
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| 222 | // check DMA channel parameters |
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| 223 | unsigned int x = cluster_xy >> Y_WIDTH; |
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| 224 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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| 225 | if ( (x >= X_SIZE) || (y >= Y_SIZE) || (channel_id >= NB_DMA_CHANNELS) ) |
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| 226 | { |
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| 227 | _printf("\n[GIET ERROR] in _dma_physical_copy() : illegal DMA channel "); |
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| 228 | _exit(); |
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| 229 | } |
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| 230 | |
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| 231 | // check buffers alignment constraints |
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| 232 | if ( (dst_paddr & 0x3) || (src_paddr & 0x3) || (size & 0x3) ) |
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| 233 | { |
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| 234 | _printf("\n[GIET ERROR] in _dma_physical_copy() : buffer unaligned\n"); |
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| 235 | _exit(); |
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| 236 | } |
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| 237 | |
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| 238 | #if GIET_DEBUG_DMA_DRIVER |
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| 239 | _printf("\n[DMA DEBUG] Start a dma_physical_copy on channel[%d,%d,%d] at cycle %d\n" |
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| 240 | " - src_paddr = %l\n" |
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| 241 | " - dst_paddr = %l\n" |
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| 242 | " - bytes = %x\n", |
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| 243 | x, y, channel_id, _get_proctime(), src_paddr, dst_paddr, size ); |
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| 244 | #endif |
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| 245 | |
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| 246 | // dma channel configuration & lauching |
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| 247 | _dma_start_transfer( cluster_xy, channel_id, dst_paddr, src_paddr, size ); |
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| 248 | |
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| 249 | // scan dma channel status |
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| 250 | unsigned int status = _dma_get_status( cluster_xy, channel_id ); |
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| 251 | while( (status != DMA_SUCCESS) && |
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| 252 | (status != DMA_READ_ERROR) && |
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| 253 | (status != DMA_WRITE_ERROR) ) |
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| 254 | { |
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| 255 | status = _dma_get_status( cluster_xy, channel_id ); |
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| 256 | |
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| 257 | #if GIET_DEBUG_DMA_DRIVER |
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| 258 | _printf("\n[DMA DEBUG] _dma_physical_copy() : ... waiting on DMA_STATUS register\n"); |
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| 259 | #endif |
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| 260 | |
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| 261 | } |
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| 262 | |
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| 263 | // analyse status |
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| 264 | if( status != DMA_SUCCESS ) |
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| 265 | { |
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| 266 | _printf("\n[GIET ERROR] in _dma_physical_copy() : DMA_STATUS = %x\n", status ); |
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| 267 | _exit(); |
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| 268 | } |
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| 269 | // reset dma channel |
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| 270 | _dma_reset( cluster_xy, channel_id ); |
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| 271 | |
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| 272 | #if GIET_DEBUG_DMA_DRIVER |
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| 273 | _printf("\n[DMA DEBUG] _dma_physical_copy() completed at cycle %d\n", _get_proctime() ); |
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| 274 | #endif |
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| 275 | |
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| 276 | #else // NB_DMA_CHANNELS == 0 |
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| 277 | _printf("\n[GIET ERROR] in _dma_physical_copy() : NB_DMA_CHANNELS == 0 / cycle %d\n", |
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| 278 | _get_proctime ); |
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| 279 | _exit(); |
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| 280 | #endif |
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| 281 | } |
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| 282 | |
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| 283 | /////////////////////////////////////////////////////////////////////////////////// |
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| 284 | // This function copies a source memory buffer to a destination memory buffer, |
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| 285 | // making virtual to physical address translation: the MMU should be activated. |
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| 286 | // This blocking function is supposed to be used by the kernel only, |
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[258] | 287 | // and uses a polling policy on DMA_STATUS register to detect completion. |
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| 288 | // Therefore, the DMA_IRQ is NOT used. |
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[343] | 289 | // The source and destination buffers base addresses must be word aligned, |
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| 290 | // and the buffer's size must be multiple of 4. |
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| 291 | // In case of error (buffer unmapped, unaligned, or DMA_STATUS error), an error |
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| 292 | // message is displayed on TTY0, and the system crash. |
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[258] | 293 | /////////////////////////////////////////////////////////////////////////////////// |
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[343] | 294 | void _dma_copy( unsigned int cluster_xy, // DMA cluster |
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| 295 | unsigned int channel_id, // DMA channel |
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| 296 | unsigned int vspace_id, // vspace index for v2p translation |
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| 297 | unsigned int dst_vaddr, // dst_vaddr buffer vbase |
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| 298 | unsigned int src_vaddr, // src_vaddr buffer vbase |
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| 299 | unsigned int size ) // bytes |
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[258] | 300 | { |
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| 301 | #if NB_DMA_CHANNELS > 0 |
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| 302 | |
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[343] | 303 | // check DMA channel parameters |
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| 304 | unsigned int x = cluster_xy >> Y_WIDTH; |
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| 305 | unsigned int y = cluster_xy & ((1<<Y_WIDTH)-1); |
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| 306 | if ( (x >= X_SIZE) || (y >= Y_SIZE) || (channel_id >= NB_DMA_CHANNELS) ) |
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| 307 | { |
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| 308 | _printf("\n[GIET ERROR] in _dma_copy() : illegal DMA channel "); |
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| 309 | _exit(); |
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| 310 | } |
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[258] | 311 | |
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[343] | 312 | // check buffers alignment constraints |
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| 313 | if ( (dst_vaddr & 0x3) || (src_vaddr & 0x3) || (size & 0x3) ) |
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| 314 | { |
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| 315 | _printf("\n[GIET ERROR] in _dma_copy() : buffer unaligned\n"); |
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| 316 | _exit(); |
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| 317 | } |
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| 318 | |
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[258] | 319 | unsigned int ko; |
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| 320 | unsigned int ppn; |
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| 321 | unsigned int flags; |
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| 322 | |
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| 323 | #if GIET_DEBUG_DMA_DRIVER |
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[343] | 324 | _printf("\n[DMA DEBUG] Start a dma_copy on channel[%d,%d,%d] at cycle %d\n" |
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[313] | 325 | " - src_vaddr = %x\n" |
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| 326 | " - dst_vaddr = %x\n" |
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| 327 | " - bytes = %x\n", |
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[343] | 328 | x, y, channel_id, _get_proctime(), src_vaddr, dst_vaddr, size ); |
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[258] | 329 | #endif |
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| 330 | |
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| 331 | // checking alignment constraints |
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[343] | 332 | if ( (((unsigned int)dst_vaddr) & 0x3) || |
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| 333 | (((unsigned int)src_vaddr) & 0x3) || |
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[258] | 334 | (size & 0x3) ) |
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| 335 | { |
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[295] | 336 | _printf("\n[GIET ERROR] in _dma_copy() : buffer unaligned\n"); |
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[258] | 337 | _exit(); |
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| 338 | } |
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| 339 | |
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[343] | 340 | // get vspace page table pointer |
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[345] | 341 | unsigned int pt = _ptabs_vaddr[vspace_id]; |
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[258] | 342 | |
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[343] | 343 | // get src_paddr buffer physical addresse |
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[258] | 344 | ko = _v2p_translate( (page_table_t*)pt, // page table pointer |
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[343] | 345 | src_vaddr>>12, // vpn |
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[258] | 346 | &ppn, // ppn |
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| 347 | &flags ); // flags |
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| 348 | if ( ko ) |
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| 349 | { |
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[295] | 350 | _printf("\n[GIET ERROR] in _dma_copy() : source buffer unmapped\n"); |
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[258] | 351 | _exit(); |
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| 352 | } |
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| 353 | unsigned long long src_paddr = (((unsigned long long)ppn) << 12) | |
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[343] | 354 | (unsigned long long)(src_vaddr & 0x00000FFF); |
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[258] | 355 | |
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[343] | 356 | // get dst_paddr buffer physical addresse |
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[258] | 357 | ko = _v2p_translate( (page_table_t*)pt, // page table pointer |
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[343] | 358 | dst_vaddr>>12, // vpn |
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[258] | 359 | &ppn, // ppn |
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| 360 | &flags ); // flags |
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| 361 | if ( ko ) |
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| 362 | { |
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[295] | 363 | _printf("\n[GIET ERROR] in _dma_copy() : dest buffer unmapped\n"); |
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[258] | 364 | _exit(); |
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| 365 | } |
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| 366 | unsigned long long dst_paddr = (((unsigned long long)ppn) << 12) | |
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[343] | 367 | (unsigned long long)(dst_vaddr & 0x00000FFF); |
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[258] | 368 | |
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| 369 | #if GIET_DEBUG_DMA_DRIVER |
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[313] | 370 | _printf(" - src_paddr = %l\n" |
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| 371 | " - dst_paddr = %l\n", |
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[295] | 372 | src_paddr, dst_paddr ); |
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[258] | 373 | #endif |
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| 374 | |
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| 375 | // dma channel configuration & lauching |
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[343] | 376 | _dma_start_transfer( cluster_xy, channel_id, dst_paddr, src_paddr, size ); |
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[258] | 377 | |
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| 378 | // scan dma channel status |
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[263] | 379 | unsigned int status = _dma_get_status( cluster_xy, channel_id ); |
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[258] | 380 | while( (status != DMA_SUCCESS) && |
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| 381 | (status != DMA_READ_ERROR) && |
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| 382 | (status != DMA_WRITE_ERROR) ) |
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| 383 | { |
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[263] | 384 | status = _dma_get_status( cluster_xy, channel_id ); |
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[258] | 385 | |
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| 386 | #if GIET_DEBUG_DMA_DRIVER |
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[343] | 387 | _printf("\n[DMA DEBUG] _dma_copy() : ... waiting on DMA_STATUS register\n"); |
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[258] | 388 | #endif |
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| 389 | |
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| 390 | } |
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| 391 | |
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| 392 | // analyse status |
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| 393 | if( status != DMA_SUCCESS ) |
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| 394 | { |
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[295] | 395 | _printf("\n[GIET ERROR] in _dma_copy() : DMA_STATUS = %x\n", status ); |
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[258] | 396 | _exit(); |
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| 397 | } |
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| 398 | // reset dma channel |
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[263] | 399 | _dma_reset( cluster_xy, channel_id ); |
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[258] | 400 | |
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| 401 | #if GIET_DEBUG_DMA_DRIVER |
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[295] | 402 | _printf("\n[DMA DEBUG] _dma_copy() completed at cycle %d\n", _get_proctime() ); |
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[258] | 403 | #endif |
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| 404 | |
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| 405 | #else // NB_DMA_CHANNELS == 0 |
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[333] | 406 | _printf("\n[GIET ERROR] in _dma_copy() : NB_DMA_CHANNELS == 0 / cycle %d\n", |
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| 407 | _get_proctime ); |
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[258] | 408 | _exit(); |
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| 409 | #endif |
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| 410 | } // end _dma_copy |
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| 411 | |
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[320] | 412 | /////////////////////////////////////////////////////////////////////////////// |
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| 413 | // This ISR handles the IRQ generated by a DMA channel. |
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| 414 | /////////////////////////////////////////////////////////////////////////////// |
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| 415 | void _dma_isr( unsigned int irq_type, |
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| 416 | unsigned int irq_id, |
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| 417 | unsigned int channel ) |
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| 418 | { |
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[333] | 419 | _printf("\n[GIET ERROR] _dma_isr() not implemented / cycle %d\n", |
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| 420 | _get_proctime() ); |
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[320] | 421 | _exit(); |
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| 422 | } |
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[258] | 423 | |
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| 424 | |
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| 425 | |
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[320] | 426 | |
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[258] | 427 | // tab-width: 4 |
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| 428 | // c-basic-offset: 4 |
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| 429 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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| 430 | // indent-tabs-mode: nil |
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| 431 | // End: |
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| 432 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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| 433 | |
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