[276] | 1 | #include <ioc.h> |
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| 2 | #include <defs.h> |
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| 3 | |
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| 4 | #define in_reset __attribute__((section (".reset"))) |
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| 5 | #define in_reset_data __attribute__((section (".reset_data"))) |
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| 6 | #define in_unckdata __attribute__((section (".unckdata"))) |
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| 7 | |
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| 8 | in_unckdata int volatile _ioc_lock = 0; |
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| 9 | in_reset_data int volatile _ioc_done = 0; |
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| 10 | in_reset_data int volatile _ioc_status; |
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| 11 | |
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| 12 | #ifndef SOCLIB_IOC |
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| 13 | /*in_reset_data volatile unsigned int _ioc_init_ok = 0;*/ |
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| 14 | |
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| 15 | static in_reset_data struct sdcard_dev _sdcard_device; |
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| 16 | static in_reset_data struct spi_dev * _spi_device = ( struct spi_dev * )IOC_BASE; |
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| 17 | #endif |
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| 18 | |
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| 19 | ////////////////////////////////////////////////////////////////////////////////////////// |
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| 20 | // I/O BLOCK_DEVICE |
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| 21 | // The three functions below use the three variables _ioc_lock _ioc_done, |
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| 22 | // and _ioc_status for synchronsation. |
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| 23 | // - As the IOC component can be used by several programs running in parallel, |
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| 24 | // the _ioc_lock variable guaranties exclusive access to the device. |
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| 25 | // The _ioc_read() and _ioc_write() functions use atomic LL/SC to get the lock. |
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| 26 | // and set _ioc_lock to a non zero value. |
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| 27 | // The _ioc_write() and _ioc_read() functions are blocking, polling the _ioc_lock |
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| 28 | // variable until the device is available. |
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| 29 | // - When the tranfer is completed, the ISR routine activated by the IOC IRQ |
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| 30 | // set the _ioc_done variable to a non-zero value. Possible address errors detected |
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| 31 | // by the IOC peripheral are reported by the ISR in the _ioc_status variable. |
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| 32 | // The _ioc_completed() function is polling the _ioc_done variable, waiting for |
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| 33 | // tranfer conpletion. When the completion is signaled, the _ioc_completed() function |
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| 34 | // reset the _ioc_done variable to zero, and releases the _ioc_lock variable. |
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| 35 | // |
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| 36 | // In a multi-tasks environment, this polling policy must be replaced by a |
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| 37 | // descheduling policy for the requesting process. |
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| 38 | ////////////////////////////////////////////////////////////////////// |
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| 39 | |
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| 40 | ////////////////////////////////////////////////////////////////////// |
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| 41 | // _dcache_buf_invalidate() |
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| 42 | // Invalidate all cache lines corresponding to a memory buffer. |
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| 43 | // This is used by the block_device driver. |
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| 44 | ///////////////////////////////////////////////////////////////////////// |
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| 45 | //in_reset static void _dcache_buf_invalidate(const void * buffer, size_t size) |
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| 46 | //{ |
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| 47 | // size_t i; |
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| 48 | // size_t dcache_line_size; |
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| 49 | // |
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| 50 | // // retrieve dcache line size from config register (bits 12:10) |
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| 51 | // asm volatile("mfc0 %0, $16, 1" : "=r" (dcache_line_size)); |
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| 52 | // |
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| 53 | // dcache_line_size = 2 << ((dcache_line_size>>10) & 0x7); |
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| 54 | // |
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| 55 | // // iterate on lines to invalidate each one of them |
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| 56 | // for ( i=0; i<size; i+=dcache_line_size ) |
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[286] | 57 | // asm volatile |
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| 58 | // (" mtc2 %0, $7\n" |
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| 59 | // : |
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| 60 | // : "r" (*((char*)buffer+i)) |
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| 61 | // ); |
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[276] | 62 | //} |
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| 63 | |
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| 64 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 65 | // _ioc_get_lock() |
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| 66 | // This blocking function is used by the _ioc_read() and _ioc_write() functions |
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| 67 | // to get _ioc_lock using LL/SC. |
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| 68 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 69 | in_reset void _ioc_get_lock() |
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| 70 | { |
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| 71 | register unsigned int proctime; |
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| 72 | register unsigned int delay; |
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| 73 | register unsigned int* plock = (unsigned int*)&_ioc_lock; |
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| 74 | |
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| 75 | asm volatile( |
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| 76 | "mfc0 %0, $9 \n" |
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| 77 | : "=r"(proctime) |
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| 78 | : /* No inputs */ |
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| 79 | ); |
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| 80 | |
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| 81 | delay = (proctime & 0xF) << 4; |
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| 82 | |
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| 83 | asm volatile ("_ioc_llsc: \n" |
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| 84 | "ll $2, 0(%0) \n" // $2 <= _ioc_lock |
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| 85 | "bnez $2, _ioc_delay \n" // random delay if busy |
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| 86 | "li $3, 1 \n" // prepare argument for sc |
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| 87 | "sc $3, 0(%0) \n" // try to set _ioc_busy |
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| 88 | "bnez $3, _ioc_ok \n" // exit if atomic |
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| 89 | "_ioc_delay: \n" |
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| 90 | "move $4, %1 \n" // $4 <= delay |
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| 91 | "_ioc_loop: \n" |
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| 92 | "addi $4, $4, -1 \n" // $4 <= $4 - 1 |
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| 93 | "beqz $4, _ioc_loop \n" // test end delay |
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| 94 | "j _ioc_llsc \n" // retry |
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| 95 | "_ioc_ok: \n" |
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| 96 | ::"r"(plock),"r"(delay):"$2","$3","$4"); |
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| 97 | } |
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| 98 | |
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| 99 | in_reset int _ioc_init() |
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| 100 | { |
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| 101 | #ifndef SOCLIB_IOC |
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| 102 | in_reset_data static char init_begin[] = "Initializing block device\n\r"; |
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| 103 | in_reset_data static char init_end[] = "Finish block device initialization\n\r"; |
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| 104 | |
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| 105 | unsigned char sdcard_rsp; |
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| 106 | |
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| 107 | boot_puts(init_begin); |
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| 108 | |
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[286] | 109 | #ifndef SYSCLK_FREQ |
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| 110 | #warning "Using default value for SYSCLK_FREQ = 50000000" |
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| 111 | #define SYSCLK_FREQ 50000000U |
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| 112 | #endif |
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| 113 | |
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[276] | 114 | /** |
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| 115 | * Initializing the SPI controller |
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| 116 | */ |
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| 117 | spi_dev_config ( |
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| 118 | _spi_device , |
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| 119 | 200000 , /**< SPI_clk: 200 Khz */ |
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[286] | 120 | SYSCLK_FREQ , /**< Sys_clk */ |
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[276] | 121 | 8 , /**< Charlen: 8 */ |
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| 122 | SPI_TX_NEGEDGE, |
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| 123 | SPI_RX_POSEDGE |
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| 124 | ); |
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| 125 | |
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| 126 | /** |
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| 127 | * Initializing the SD Card |
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| 128 | */ |
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| 129 | if ( (sdcard_rsp = sdcard_dev_open(&_sdcard_device, _spi_device, 0)) ) |
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| 130 | return sdcard_rsp; |
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| 131 | |
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| 132 | if ( (sdcard_rsp = sdcard_dev_set_blocklen(&_sdcard_device, 512)) ) |
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| 133 | return sdcard_rsp; |
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| 134 | |
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| 135 | /** |
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| 136 | * Incrementing SDCARD clock frequency for normal function |
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| 137 | */ |
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| 138 | spi_dev_config ( |
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| 139 | _spi_device , |
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| 140 | 10000000 , /**< SPI_clkL 10 Mhz */ |
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[286] | 141 | SYSCLK_FREQ , /**< Sys_clk */ |
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[276] | 142 | -1 , /**< Charlen: 8 */ |
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| 143 | -1 , |
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| 144 | -1 |
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| 145 | ); |
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| 146 | |
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| 147 | boot_puts(init_end); |
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| 148 | #endif |
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| 149 | |
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| 150 | return 0; |
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| 151 | } |
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| 152 | |
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| 153 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 154 | // _ioc_completed() |
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| 155 | // This blocking function cheks completion of an I/O transfer and reports errors. |
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| 156 | // It returns 0 if the transfer is successfully completed. |
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| 157 | // It returns -1 if an error has been reported. |
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| 158 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 159 | in_reset int _ioc_completed() |
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| 160 | { |
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| 161 | unsigned int status = 0; |
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| 162 | |
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| 163 | #ifdef SOCLIB_IOC |
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| 164 | |
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| 165 | unsigned int * ioc_address = ( unsigned int * )VCIBD_BASE; |
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| 166 | |
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| 167 | while ( 1 ) |
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| 168 | { |
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| 169 | status = ioread32(&ioc_address[BLOCK_DEVICE_STATUS]); |
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| 170 | |
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| 171 | if (( status == BLOCK_DEVICE_READ_SUCCESS ) || |
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| 172 | ( status == BLOCK_DEVICE_READ_ERROR )) |
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| 173 | break; |
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| 174 | } |
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| 175 | |
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| 176 | #endif |
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| 177 | |
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| 178 | return status; |
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| 179 | } |
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| 180 | |
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| 181 | ////////////////////////////////////////////////////////////////////////////////////// |
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| 182 | // _ioc_write() |
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| 183 | // Transfer data from a memory buffer to a file on the block_device. |
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| 184 | // - lba : first block index on the disk |
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| 185 | // - buffer : base address of the memory buffer |
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| 186 | // - count : number of blocks to be transfered |
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| 187 | // The source buffer must be in user address space. |
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| 188 | /////////////////////////////////////////////////////////////////////////////////////// |
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| 189 | in_reset int _ioc_write(size_t lba, void* buffer, size_t count) |
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| 190 | { |
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| 191 | // get the lock |
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| 192 | // _ioc_get_lock(); |
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| 193 | |
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| 194 | #ifdef SOCLIB_IOC |
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| 195 | |
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| 196 | unsigned int * ioc_address = ( unsigned int * )VCIBD_BASE; |
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| 197 | |
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| 198 | // block_device configuration |
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| 199 | iowrite32( &ioc_address[BLOCK_DEVICE_BUFFER], |
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| 200 | ( unsigned int ) buffer ); |
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| 201 | |
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| 202 | iowrite32( &ioc_address[BLOCK_DEVICE_COUNT], |
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| 203 | ( unsigned int ) count ); |
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| 204 | |
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| 205 | iowrite32( &ioc_address[BLOCK_DEVICE_LBA], |
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| 206 | ( unsigned int ) lba ); |
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| 207 | |
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| 208 | iowrite32( &ioc_address[BLOCK_DEVICE_IRQ_ENABLE], |
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| 209 | ( unsigned int ) 0 ); |
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| 210 | |
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| 211 | iowrite32( &ioc_address[BLOCK_DEVICE_OP], |
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| 212 | ( unsigned int ) BLOCK_DEVICE_WRITE); |
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| 213 | |
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| 214 | _ioc_completed(); |
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| 215 | |
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| 216 | #else |
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| 217 | /* |
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| 218 | in_reset_data static char end_line[] = |
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| 219 | "\n\r"; |
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| 220 | in_reset_data static char error_init[] = |
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| 221 | "ERROR during initialization of block device. Code: "; |
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| 222 | |
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| 223 | unsigned int sdcard_rsp; |
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| 224 | |
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| 225 | if ( _ioc_init_ok == 0 ) |
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| 226 | { |
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| 227 | if (( sdcard_rsp = _ioc_init(&_sdcard_device, 0) )) |
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| 228 | { |
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| 229 | boot_puts(error_init); |
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| 230 | boot_putx(sdcard_rsp); |
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| 231 | boot_puts(end_line); |
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| 232 | } |
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| 233 | |
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| 234 | _ioc_init_ok = 1; |
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| 235 | } |
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| 236 | */ |
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| 237 | |
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| 238 | sdcard_dev_lseek(&_sdcard_device, lba); |
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| 239 | sdcard_dev_write(&_sdcard_device, buffer, count*512); |
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| 240 | |
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| 241 | #endif |
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| 242 | |
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| 243 | // _ioc_lock = 0; |
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| 244 | |
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| 245 | return 0; |
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| 246 | } |
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| 247 | |
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| 248 | /** |
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| 249 | * _ioc_read() |
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| 250 | * |
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| 251 | * Transfer data from a file on the block device to a memory buffer. |
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| 252 | * |
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| 253 | * \param lba : first block index on the disk |
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| 254 | * \param buffer : base address of the memory buffer |
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| 255 | * \param count : number of blocks to be transfered |
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| 256 | * |
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| 257 | * \note This is a blocking function. The function returns once the transfer |
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| 258 | * has finished |
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| 259 | */ |
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| 260 | in_reset int _ioc_read(size_t lba, void* buffer, size_t count) |
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| 261 | { |
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| 262 | // get the lock |
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| 263 | // _ioc_get_lock(); |
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| 264 | |
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| 265 | #ifdef SOCLIB_IOC |
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| 266 | |
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| 267 | unsigned int * ioc_address = (unsigned int*)VCIBD_BASE; |
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| 268 | |
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| 269 | // block_device configuration |
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| 270 | iowrite32( &ioc_address[BLOCK_DEVICE_BUFFER], |
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| 271 | ( unsigned int ) buffer ); |
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| 272 | |
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| 273 | iowrite32( &ioc_address[BLOCK_DEVICE_COUNT], |
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| 274 | ( unsigned int ) count ); |
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| 275 | |
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| 276 | iowrite32( &ioc_address[BLOCK_DEVICE_LBA], |
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| 277 | ( unsigned int ) lba ); |
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| 278 | |
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| 279 | iowrite32( &ioc_address[BLOCK_DEVICE_IRQ_ENABLE], |
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| 280 | ( unsigned int ) 0 ); |
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| 281 | |
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| 282 | iowrite32( &ioc_address[BLOCK_DEVICE_OP], |
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| 283 | ( unsigned int ) BLOCK_DEVICE_READ ); |
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| 284 | |
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| 285 | _ioc_completed(); |
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| 286 | |
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| 287 | #else |
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| 288 | in_reset_data static char error_read[] = |
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| 289 | "ERROR during read on the SDCARD device. Code: "; |
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| 290 | in_reset_data static char end_line[] = |
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| 291 | "\n\r"; |
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| 292 | /* |
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| 293 | in_reset_data static char error_init[] = |
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| 294 | "ERROR during initialization of block device. Code: "; |
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| 295 | */ |
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| 296 | |
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| 297 | unsigned int sdcard_rsp; |
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| 298 | |
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| 299 | /* |
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| 300 | if ( _ioc_init_ok == 0 ) |
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| 301 | { |
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| 302 | if (( sdcard_rsp = _ioc_init(&_sdcard_device, 0) )) |
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| 303 | { |
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| 304 | boot_puts(error_init); |
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| 305 | boot_putx(sdcard_rsp); |
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| 306 | boot_puts(end_line); |
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| 307 | } |
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| 308 | |
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| 309 | _ioc_init_ok = 1; |
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| 310 | } |
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| 311 | */ |
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| 312 | |
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| 313 | sdcard_dev_lseek(&_sdcard_device, lba); |
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| 314 | |
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[279] | 315 | unsigned int i; |
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| 316 | for(i = 0; i < count; i++) |
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[276] | 317 | { |
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[279] | 318 | if (( sdcard_rsp = sdcard_dev_read ( |
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| 319 | &_sdcard_device, |
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| 320 | (unsigned char *) buffer + (512 * i), |
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| 321 | 512 |
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| 322 | ) |
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| 323 | )) |
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| 324 | { |
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| 325 | boot_puts(error_read); |
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| 326 | boot_putx(sdcard_rsp); |
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| 327 | boot_puts(end_line); |
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| 328 | |
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| 329 | return 1; |
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| 330 | } |
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| 331 | } |
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[276] | 332 | |
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| 333 | #endif |
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| 334 | |
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| 335 | //_ioc_lock = 0; |
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| 336 | |
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| 337 | return 0; |
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| 338 | } |
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| 339 | #undef in_reset |
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| 340 | #undef in_reset_data |
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| 341 | #undef in_unckdata |
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| 342 | |
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| 343 | /* |
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| 344 | * vim: tabstop=4 : shiftwidth=4 : expandtab |
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| 345 | */ |
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