nand_fdl/common/src/fdl_crc.c

   1 #include <asm/arch/fdl_stdio.h>
   2 #include <asm/arch/fdl_crc.h>
   3 #include <asm/arch/cmd_def.h>
   4 #include <asm/arch/sci_types.h>
   5
   6 #ifdef __cplusplus
   7 extern   "C"
   8 {
   9 #endif
  10
  11 ///////////////////////////////////////////////////////////////////
  12 //CRC Table
  13 ///////////////////////////////////////////////////////////////////
  14 /** CRC table for the CRC-16. The poly is 0x8005 (x^16 + x^15 + x^2 + 1) */
  15 static uint16 const crc16_table[256] =
  16 {
  17     0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,
  18     0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,
  19     0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,
  20     0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,
  21     0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,
  22     0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,
  23     0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,
  24     0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,
  25     0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,
  26     0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,
  27     0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,
  28     0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,
  29     0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,
  30     0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,
  31     0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,
  32     0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,
  33     0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,
  34     0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,
  35     0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,
  36     0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,
  37     0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,
  38     0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,
  39     0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,
  40     0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,
  41     0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,
  42     0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,
  43     0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,
  44     0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,
  45     0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,
  46     0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,
  47     0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,
  48     0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040
  49 };
  50
  51 /*********************************************************************/
  52
  53 unsigned int crc_16_l_calc (char *buf_ptr,unsigned int len)
  54 {
  55     unsigned int i;
  56     unsigned short crc = 0;
  57
  58     while (len--!=0)
  59     {
  60         for (i = CRC_16_L_SEED; i !=0 ; i = i>>1)
  61         {
  62             if ( (crc & CRC_16_L_POLYNOMIAL) !=0)
  63             {
  64                 crc = crc << 1 ;
  65                 crc = crc ^ CRC_16_POLYNOMIAL;
  66             }
  67             else
  68             {
  69                 crc = crc << 1 ;
  70             }
  71
  72             if ( (*buf_ptr & i) != 0) /*lint !e737*/
  73             {
  74                 crc = crc ^ CRC_16_POLYNOMIAL;
  75             }
  76         }
  77
  78         buf_ptr++;
  79     }
  80
  81     return (crc);
  82 }
  83
  84 unsigned short frm_chk (const unsigned short *src, int len)
  85 {
  86     unsigned int sum = 0;
  87
  88     while (len > 3)
  89     {
  90         sum += *src++;
  91         sum += *src++;
  92         len -= 4;
  93     }
  94
  95     switch (len&0x03)
  96     {
  97         case 2:
  98             sum += *src++;
  99             break;
 100         case 3:
 101             sum += *src++;
 102             sum += * ( (unsigned char *) src);
 103             break;
 104         case 1:
 105             sum += * ( (unsigned char *) src);
 106             break;
 107         default:
 108             break;
 109     }
 110
 111     sum = (sum >> 16) + (sum & 0x0FFFF);
 112     sum += (sum >> 16);
 113     return (~sum);
 114 }
 115 //This param src must be 4 byte aligned.
 116 unsigned long Get_CheckSum (const unsigned char *src, int len)
 117 {
 118     unsigned long sum =0;
 119
 120     while (len > 3)
 121     {
 122         //sum += *((unsigned long *)src)++;
 123         sum += *src++;
 124         sum += *src++;
 125         sum += *src++;
 126         sum += *src++;
 127
 128         len-=4;
 129     }
 130
 131     while (len)
 132     {
 133         sum +=*src++;
 134         len--;
 135     }
 136
 137     return sum;
 138 }
 139 /**
 140  * crc16 - compute the CRC-16 for the data buffer
 141  * @crc:        previous CRC value
 142  * @buffer:     data pointer
 143  * @len:        number of bytes in the buffer
 144  *
 145  * Returns the updated CRC value.
 146  */
 147 #if 0
 148 uint16 crc16 (uint16 crc, uint8 const *buffer, uint32 len)
 149 {
 150     while (len--)
 151     {
 152         crc = (crc >> 8) ^ (crc16_table[ (crc^ (*buffer++)) &0xff]);
 153     }
 154
 155     return crc;
 156 }
 157 #endif
 158 /**---------------------------------------------------------------------------*/
 159 #ifdef __cplusplus
 160 }
 161 #endif