[258] | 1 | /////////////////////////////////////////////////////////////////////////////////// |
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| 2 | // File : fbf_driver.c |
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| 3 | // Date : 23/05/2013 |
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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 fbf_driver.c and fbf_driver.h files are part ot the GIET-VM kernel. |
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| 8 | // This driver supports the SoCLib vci_framebuffer component. |
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| 9 | // |
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| 10 | // There exist two methods to access the VciFrameBuffer device: |
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| 11 | // |
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| 12 | // 1) The _fb_sync_write() and _fb_sync_read() functions use a memcpy strategy |
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| 13 | // to implement the transfer between a data buffer (user space) and the frame |
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| 14 | // buffer (kernel space). They are blocking until completion of the transfer. |
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| 15 | // |
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| 16 | // 2) The _fb_cma_init(), _fb_cma_write() and _fb_cma_stop() functions use |
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| 17 | // the VciChbufDma component (non replicated) to transfer a flow of images from |
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| 18 | // an user space chained buffer (two buffers) to the frame buffer. |
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| 19 | // A CMA channel must be allocated to the task requesting it in the mapping_info, |
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| 20 | // and stored in the task context. |
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[320] | 21 | // |
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| 22 | // The SEG_FBF_BASE virtual address must be defined in hard_config.h file. |
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[258] | 23 | /////////////////////////////////////////////////////////////////////////////////// |
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| 24 | |
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| 25 | #include <giet_config.h> |
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[320] | 26 | #include <hard_config.h> |
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[258] | 27 | #include <fbf_driver.h> |
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| 28 | #include <utils.h> |
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| 29 | #include <dma_driver.h> |
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| 30 | #include <cma_driver.h> |
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| 31 | #include <tty_driver.h> |
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| 32 | #include <ctx_handler.h> |
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| 33 | #include <mmc_driver.h> |
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| 34 | #include <vmem.h> |
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| 35 | |
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[320] | 36 | #if !defined(SEG_FBF_BASE) |
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| 37 | # error: You must define SEG_FBF_BASE in the hard_config.h file |
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| 38 | #endif |
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| 39 | |
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[258] | 40 | #if !defined(GIET_USE_IOMMU) |
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| 41 | # error: You must define GIET_USE_IOMMU in the giet_config.h file |
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| 42 | #endif |
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| 43 | |
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| 44 | #if !defined( USE_IOB ) |
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| 45 | # error: You must define USE_IOB in the hard_config.h file |
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| 46 | #endif |
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| 47 | |
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| 48 | #define in_unckdata __attribute__((section (".unckdata"))) |
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| 49 | |
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| 50 | ////////////// memcpy approach ////////////////////////////////////////////////// |
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| 51 | |
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| 52 | ////////////////////////////////////////////////////////////////////////////////// |
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| 53 | // _fb_sync_write() |
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| 54 | // Transfer data from an memory buffer to the frame_buffer device using a memcpy. |
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| 55 | // - offset : offset (in bytes) in the frame buffer. |
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| 56 | // - buffer : base address of the memory buffer. |
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| 57 | // - length : number of bytes to be transfered. |
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| 58 | ////////////////////////////////////////////////////////////////////////////////// |
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| 59 | |
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| 60 | unsigned int _fb_sync_write(unsigned int offset, |
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| 61 | const void * buffer, |
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| 62 | unsigned int length) |
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| 63 | { |
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[320] | 64 | char* fbf_address = (char *)SEG_FBF_BASE + offset; |
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[295] | 65 | |
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[345] | 66 | memcpy( fbf_address, buffer, length); |
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[295] | 67 | |
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[258] | 68 | return 0; |
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| 69 | } |
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| 70 | ////////////////////////////////////////////////////////////////////////////////// |
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| 71 | // _fb_sync_read() |
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| 72 | // Transfer data from the frame_buffer device to a memory buffer using a memcpy. |
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| 73 | // - offset : offset (in bytes) in the frame buffer. |
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| 74 | // - buffer : base address of the memory buffer. |
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| 75 | // - length : number of bytes to be transfered. |
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| 76 | ////////////////////////////////////////////////////////////////////////////////// |
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| 77 | unsigned int _fb_sync_read( unsigned int offset, |
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| 78 | void* buffer, |
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| 79 | unsigned int length) |
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| 80 | { |
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[320] | 81 | char* fbf_address = (char *)SEG_FBF_BASE + offset; |
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[295] | 82 | |
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[345] | 83 | memcpy( buffer, fbf_address, length); |
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[295] | 84 | |
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[258] | 85 | return 0; |
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| 86 | } |
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| 87 | |
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| 88 | |
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| 89 | ///////////////// CDMA approach ////////////////////////////////////////////////// |
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| 90 | |
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| 91 | // This structure contains two chbuf descriptors that can be used by |
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| 92 | // the VciChbufDma component to tranfer a flow of images: |
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| 93 | // - The SRC chbuf descriptor contain two slots (two user buffers) |
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| 94 | // - The DST chbuf descriptor contains only one slot (frame buffer) |
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| 95 | |
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| 96 | typedef struct fb_cma_channel_s |
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| 97 | { |
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| 98 | paddr_t buf0; // physical address + status for user buffer 0 |
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| 99 | paddr_t buf1; // physical address + status for user buffer 1 |
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| 100 | paddr_t fbf; // physical address + status for frame buffer |
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| 101 | unsigned int length; // buffer length (number of bytes) |
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| 102 | unsigned int padding; // unused (just to have channel size = 32 bytes) |
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| 103 | } fb_cma_channel_t; |
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| 104 | |
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[263] | 105 | // array of FB_CMA channels descriptors (32 bytes per entry) |
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| 106 | // each entry contains one SRC and one DST chbuf descriptors. |
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[258] | 107 | in_unckdata volatile fb_cma_channel_t |
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| 108 | _fb_cma_channel[NB_CMA_CHANNELS] __attribute__((aligned(64))); |
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| 109 | |
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[263] | 110 | // array of physical addresses for the FB_CMA channels descriptors |
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[258] | 111 | in_unckdata volatile paddr_t |
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| 112 | _fb_cma_desc_paddr[NB_CMA_CHANNELS]; |
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| 113 | |
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| 114 | ////////////////////////////////////////////////////////////////////////////////////// |
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| 115 | // _fb_cma_init() |
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| 116 | // This function uses the _fb_cma_channel[] and _fb_cma_desc_paddr[] arrays, |
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[263] | 117 | // (that are both indexed by the channel index), and does four things: |
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[258] | 118 | // |
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| 119 | // 1) computes the physical addresses for the two source user buffers, for |
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| 120 | // the destination frame buffer. It initialises the channel descriptor |
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| 121 | // _fb_cma_channel[i], containing the SRC chbuf descriptor (two buffers), |
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[263] | 122 | // the DST chbuf descriptor (one single buffer), and the buffer length. |
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[258] | 123 | // |
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| 124 | // 2) computes the physical address for the channel descriptor and register it |
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| 125 | // in the _fb_cma_desc_paddr[i]. |
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| 126 | // |
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| 127 | // 3) makes a SYNC request to L2 cache for channel descriptor, because the |
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| 128 | // channel descriptor is directly accessed in XRAM by the CMA component. |
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| 129 | // |
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| 130 | // 4) Starts the CMA hardware channel, that will poll the channel descriptor |
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| 131 | // to fransfer an user buffer to the frame buffer as soon as the source |
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| 132 | // user buffer is marked valid. |
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| 133 | // |
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| 134 | // Returns 0 if success, > 0 if error |
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| 135 | ////////////////////////////////////////////////////////////////////////////////////// |
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| 136 | unsigned int _fb_cma_init( const void* vbase0, // first user buffer vbase address |
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| 137 | const void* vbase1, // second user buffer vbase address |
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| 138 | unsigned int length ) // buffer length (number of bytes) |
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| 139 | { |
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| 140 | #if NB_CMA_CHANNELS > 0 |
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| 141 | |
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| 142 | unsigned int channel_id; // CMA channel index |
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| 143 | unsigned int user_ptab; // page table virtual address |
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| 144 | unsigned int ko; // unsuccessfull V2P translation |
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| 145 | unsigned int vaddr; // virtual address |
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| 146 | unsigned int flags; // protection flags |
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| 147 | unsigned int ppn; // physical page number |
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[263] | 148 | paddr_t desc_paddr; // physical address of channel descriptor |
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[258] | 149 | |
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| 150 | // get CMA channel index |
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| 151 | channel_id = _get_context_slot(CTX_CMA_ID); |
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| 152 | if ( channel_id >= NB_CMA_CHANNELS ) |
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| 153 | { |
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[295] | 154 | _printf("\n[GIET ERROR] in _fb_cma_init() : CMA channel index too large\n"); |
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[258] | 155 | return 1; |
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| 156 | } |
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| 157 | |
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| 158 | // checking size for channel descriptor |
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| 159 | if ( sizeof(fb_cma_channel_t) != 32 ) |
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| 160 | { |
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[295] | 161 | _printf("\n[GIET ERROR] in _fb_cma_init() : bad fb_cma_channel size\n"); |
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[258] | 162 | return 1; |
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| 163 | } |
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| 164 | |
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| 165 | // checking channel descriptor alignment (32 bytes) |
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| 166 | if ( (unsigned int)(&_fb_cma_channel[channel_id]) & 0x1F ) |
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| 167 | { |
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[295] | 168 | _printf("\n[GIET ERROR] in _fb_cma_init() : bad fb_cma_channel alignment\n"); |
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[258] | 169 | return 1; |
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| 170 | } |
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| 171 | |
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| 172 | // checking user buffer virtual addresses and length alignment |
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| 173 | if ( ((unsigned int)vbase0 & 0x3) || ((unsigned int)vbase1 & 0x3) || (length & 0x3) ) |
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| 174 | { |
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[295] | 175 | _printf("\n[GIET ERROR] in _fb_cma_init() : user buffer not word aligned\n"); |
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[258] | 176 | return 1; |
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| 177 | } |
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| 178 | |
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| 179 | // get page table virtual address |
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| 180 | user_ptab = _get_context_slot(CTX_PTAB_ID); |
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| 181 | |
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| 182 | // compute and register frame buffer physical address |
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[320] | 183 | vaddr = ((unsigned int)SEG_FBF_BASE); |
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[258] | 184 | ko = _v2p_translate( (page_table_t*) user_ptab, |
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| 185 | (vaddr >> 12), |
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| 186 | &ppn, |
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| 187 | &flags ); |
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| 188 | if (ko) |
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| 189 | { |
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[295] | 190 | _printf("\n[GIET ERROR] in _fb_cma_init() : frame buffer unmapped\n"); |
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[258] | 191 | return 1; |
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| 192 | } |
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| 193 | _fb_cma_channel[channel_id].fbf = ((paddr_t)ppn << 12) | (vaddr & 0x00000FFF); |
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| 194 | |
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| 195 | // Compute and register first user buffer physical address |
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| 196 | vaddr = (unsigned int)vbase0; |
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| 197 | ko = _v2p_translate( (page_table_t*) user_ptab, |
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| 198 | (vaddr >> 12), |
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| 199 | &ppn, |
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| 200 | &flags ); |
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| 201 | if (ko) |
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| 202 | { |
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[295] | 203 | _printf("\n[GIET ERROR] in _fb_cma_init() : user buffer 0 unmapped\n"); |
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[258] | 204 | return 1; |
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| 205 | } |
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| 206 | if ((flags & PTE_U) == 0) |
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| 207 | { |
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[295] | 208 | _printf("[GIET ERROR] in _fb_cma_init() : user buffer 0 not in user space\n"); |
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[258] | 209 | return 1; |
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| 210 | } |
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| 211 | _fb_cma_channel[channel_id].buf0 = ((paddr_t)ppn << 12) | (vaddr & 0x00000FFF); |
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| 212 | |
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| 213 | // Compute and register second user buffer physical address |
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| 214 | vaddr = (unsigned int)vbase1; |
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| 215 | ko = _v2p_translate( (page_table_t*) user_ptab, |
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| 216 | (vaddr >> 12), |
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| 217 | &ppn, |
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| 218 | &flags ); |
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| 219 | if (ko) |
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| 220 | { |
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[295] | 221 | _printf("\n[GIET ERROR] in _fb_cma_init() : user buffer 1 unmapped\n"); |
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[258] | 222 | return 1; |
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| 223 | } |
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| 224 | if ((flags & PTE_U) == 0) |
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| 225 | { |
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[295] | 226 | _printf("[GIET ERROR] in _fb_cma_init() : user buffer 1 not in user space\n"); |
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[258] | 227 | return 1; |
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| 228 | } |
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| 229 | _fb_cma_channel[channel_id].buf1 = ((paddr_t)ppn << 12) | (vaddr & 0x00000FFF); |
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| 230 | |
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| 231 | // register buffer length in channel descriptor |
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| 232 | _fb_cma_channel[channel_id].length = length; |
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| 233 | |
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| 234 | // Compute and register physical adress of the channel descriptor |
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| 235 | vaddr = (unsigned int)(&_fb_cma_channel[channel_id]); |
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| 236 | ko = _v2p_translate( (page_table_t*) user_ptab, |
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| 237 | (vaddr >> 12), |
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| 238 | &ppn, |
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| 239 | &flags ); |
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| 240 | if (ko) |
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| 241 | { |
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[295] | 242 | _printf("\n[GIET ERROR] in _fb_cma_init() : channel descriptor unmapped\n"); |
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[258] | 243 | return 1; |
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| 244 | } |
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[263] | 245 | _fb_cma_desc_paddr[channel_id] = (((paddr_t)ppn) << 12) | (vaddr & 0x00000FFF); |
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[258] | 246 | |
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[263] | 247 | desc_paddr = (((paddr_t)ppn) << 12) | (vaddr & 0x00000FFF); |
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| 248 | |
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| 249 | |
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| 250 | #if GIET_DEBUG_FBF_DRIVER |
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[295] | 251 | _printf("\n[CMA DEBUG] enters _fb_cma_init()\n" |
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| 252 | " - fbf pbase = %l\n" |
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| 253 | " - buf0 pbase = %l\n" |
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| 254 | " - buf1 pbase = %l\n" |
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| 255 | " - channel pbase = %l\n" |
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| 256 | _fb_cma_channel[channel_id].fbf, |
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| 257 | _fb_cma_channel[channel_id].buf0, |
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| 258 | _fb_cma_channel[channel_id].buf1, |
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| 259 | _fb_cma_desc_paddr[channel_id] ); |
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[258] | 260 | #endif |
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| 261 | |
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[275] | 262 | if ( USE_IOB ) |
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| 263 | { |
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| 264 | // SYNC request for channel descriptor |
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[297] | 265 | _mmc_sync( desc_paddr, 32 ); |
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[275] | 266 | } |
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[258] | 267 | |
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| 268 | // CMA channel activation |
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[295] | 269 | _cma_set_register( channel_id, CHBUF_SRC_DESC , (unsigned int)(desc_paddr & 0xFFFFFFFF) ); |
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| 270 | _cma_set_register( channel_id, CHBUF_SRC_EXT , (unsigned int)(desc_paddr >> 32) ); |
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| 271 | _cma_set_register( channel_id, CHBUF_SRC_NBUFS, 2 ); |
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| 272 | _cma_set_register( channel_id, CHBUF_DST_DESC , (unsigned int)(desc_paddr & 0xFFFFFFFF) + 16 ); |
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| 273 | _cma_set_register( channel_id, CHBUF_DST_EXT , (unsigned int)(desc_paddr >> 32) ); |
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| 274 | _cma_set_register( channel_id, CHBUF_DST_NBUFS, 1 ); |
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| 275 | _cma_set_register( channel_id, CHBUF_BUF_SIZE , length ); |
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| 276 | _cma_set_register( channel_id, CHBUF_PERIOD , 300 ); |
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| 277 | _cma_set_register( channel_id, CHBUF_RUN , 1 ); |
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[258] | 278 | return 0; |
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| 279 | |
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| 280 | #else |
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[295] | 281 | _printf("\n[GIET ERROR] in _fb_cma_init() : no CMA channel allocated\n"); |
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[258] | 282 | return 1; |
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| 283 | #endif |
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| 284 | } |
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[295] | 285 | |
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[263] | 286 | //////////////////////////////////////////////////////////////////////////////////// |
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[258] | 287 | // _fb_cma_write() |
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| 288 | // |
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[263] | 289 | // It updates the status of the SRC and DST chbuf descriptors, to allow the CMA |
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| 290 | // component to transfer the source user buffer to the frame buffer. |
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| 291 | // |
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| 292 | // If the IO Bridge component is used: |
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| 293 | // 1) it makes an INVAL request for the channel descriptor, before testing the |
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| 294 | // source buffer status, because it is modified in XRAM by the CMA component. |
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| 295 | // 2) it makes a SYNC request for the source user buffer before activating the CMA |
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| 296 | // transfer, because the data will be read from XRAM by the CMA component. |
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| 297 | // 3) it makes a SYNC request for the channel descriptor after modification |
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| 298 | // of the SRC and DST status, because these descriptors will be read from XRAM |
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| 299 | // by the CMA component. |
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| 300 | // |
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| 301 | // The buffer_id argument is the user buffer index (0 => buf0 / not 0 => buf1) |
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[258] | 302 | // Returns 0 if success, > 0 if error |
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[263] | 303 | //////////////////////////////////////////////////////////////////////////////////// |
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[258] | 304 | unsigned int _fb_cma_write( unsigned int buffer_id ) |
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| 305 | { |
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| 306 | #if NB_CMA_CHANNELS > 0 |
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| 307 | |
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[263] | 308 | volatile paddr_t buf_paddr; |
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| 309 | unsigned int full = 1; |
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[258] | 310 | |
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[263] | 311 | unsigned int count = 0; |
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| 312 | |
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[258] | 313 | // get CMA channel index |
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| 314 | unsigned int channel_id = _get_context_slot(CTX_CMA_ID); |
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| 315 | |
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[263] | 316 | #if GIET_DEBUG_FBF_DRIVER |
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[295] | 317 | _printf("\n[CMA DEBUG] _fb_cma_write() for CMA channel %d / bufid = %d at cycle %d\n", |
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| 318 | channel_id, buffer_id, _get_proctime() ); |
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[263] | 319 | #endif |
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[258] | 320 | |
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[263] | 321 | // waiting buffer empty |
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| 322 | while ( full ) |
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| 323 | { |
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| 324 | if ( USE_IOB ) |
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| 325 | { |
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| 326 | // INVAL L2 cache for the channel descriptor, |
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[297] | 327 | _mmc_inval( _fb_cma_desc_paddr[channel_id], 32 ); |
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[263] | 328 | |
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| 329 | // INVAL L1 cache for the channel descriptor, |
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[295] | 330 | _dcache_buf_invalidate( (void*)&_fb_cma_channel[channel_id], 32 ); |
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[263] | 331 | } |
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| 332 | |
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| 333 | // read SRC buffer descriptor |
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| 334 | if ( buffer_id == 0 ) buf_paddr = _fb_cma_channel[channel_id].buf0; |
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| 335 | else buf_paddr = _fb_cma_channel[channel_id].buf1; |
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| 336 | full = ( (unsigned int)(buf_paddr>>63) ); |
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| 337 | |
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| 338 | count++; |
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| 339 | if ( count == 10 ) _exit(); |
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| 340 | } |
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| 341 | |
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| 342 | if ( USE_IOB ) |
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| 343 | { |
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| 344 | // SYNC request for the user buffer because |
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| 345 | // this buffer will be read from XRAM by the CMA component |
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[297] | 346 | _mmc_sync( buf_paddr, _fb_cma_channel[channel_id].length ); |
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[263] | 347 | } |
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| 348 | |
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[258] | 349 | // set SRC full |
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| 350 | if ( buffer_id == 0 ) |
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| 351 | _fb_cma_channel[channel_id].buf0 = buf_paddr | 0x8000000000000000ULL; |
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| 352 | else |
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| 353 | _fb_cma_channel[channel_id].buf1 = buf_paddr | 0x8000000000000000ULL; |
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| 354 | |
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| 355 | // set DST empty |
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| 356 | _fb_cma_channel[channel_id].fbf = _fb_cma_channel[channel_id].fbf |
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| 357 | & 0x7FFFFFFFFFFFFFFFULL; |
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| 358 | |
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[263] | 359 | if ( USE_IOB ) |
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| 360 | { |
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| 361 | // SYNC request for the channel descriptor, because |
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| 362 | // it will be read in XRAM by the CMA component |
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[297] | 363 | _mmc_sync( _fb_cma_desc_paddr[channel_id], 32 ); |
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[263] | 364 | } |
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[258] | 365 | |
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| 366 | return 0; |
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| 367 | |
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| 368 | #else |
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| 369 | |
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[295] | 370 | _printf("\n[GIET ERROR] in _fb_cma_channel() : no CMA channel allocated\n"); |
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[258] | 371 | return 1; |
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| 372 | |
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| 373 | #endif |
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| 374 | } |
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| 375 | ////////////////////////////////////////////////////////////////////////////////// |
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| 376 | // _fb_cma_stop() |
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| 377 | // This function desactivates the CMA channel allocated to the calling task. |
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| 378 | // Returns 0 if success, > 0 if error |
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| 379 | ////////////////////////////////////////////////////////////////////////////////// |
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| 380 | unsigned int _fb_cma_stop( unsigned int buffer_id ) |
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| 381 | { |
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| 382 | #if NB_CMA_CHANNELS > 0 |
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| 383 | |
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| 384 | // get CMA channel allocated |
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| 385 | unsigned int channel_id = _get_context_slot(CTX_CMA_ID); |
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| 386 | |
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[295] | 387 | #if GIET_DEBUG_FBF_DRIVER |
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| 388 | _printf("\n[CMA DEBUG] _fb_cma_stop() for CMA channel %d at cycle %d\n", |
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| 389 | channel_id, _get_proctime() ); |
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| 390 | #endif |
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| 391 | |
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[258] | 392 | // CMA channel desactivation |
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[295] | 393 | _cma_set_register( channel_id, CHBUF_RUN, 0 ); |
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| 394 | |
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[258] | 395 | return 0; |
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| 396 | |
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| 397 | #else |
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| 398 | |
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[295] | 399 | _printf("\n[GIET ERROR] in _fb_cma_stop() : no CMA channel allocated\n"); |
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[258] | 400 | return 1; |
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| 401 | |
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| 402 | #endif |
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| 403 | } |
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| 404 | |
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| 405 | |
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| 406 | // Local Variables: |
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| 407 | // tab-width: 4 |
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| 408 | // c-basic-offset: 4 |
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| 409 | // c-file-offsets:((innamespace . 0)(inline-open . 0)) |
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| 410 | // indent-tabs-mode: nil |
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| 411 | // End: |
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| 412 | // vim: filetype=c:expandtab:shiftwidth=4:tabstop=4:softtabstop=4 |
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| 413 | |
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