target/linux/etrax-2.6/image/e100boot/src/cbl/src/common_init.c

   1 /*****************************************************************************
   2 *!
   3 *! FILE NAME  : common_init.c
   4 *!
   5 *! DESCRIPTION: This piece of code is loaded at bootstrap and is put in the
   6 *!              cache at 0x380000F0.  Depending of how R_BUS_STATUS<2:1> is
   7 *!              set different kinds of bootstrap is performed.
   8 *!
   9 *!              00 - Normal boot. No bootstrap is performed and this code
  10 *!                   is never loaded.
  11 *!              01 - Serial boot. 784 bytes is loaded and execution starts
  12 *!                   at 0x380000F0.
  13 *!              11 - Parallel boot. 784 bytes is loaded and execution starts
  14 *!                   at 0x380000F0.
  15 *!              10 - Network boot. 1484 bytes is loaded and execution start
  16 *!                   at 0x380000F4.
  17 *!
  18 *! ---------------------------------------------------------------------------
  19 *! HISTORY
  20 *!
  21 *! DATE         NAME               CHANGES
  22 *! ----         ----               -------
  23 *! 980326       Ronny Ranerup      Initial version
  24 *! Sep 20 1999  Jonas Dellenvall   Added port3 debug support
  25 *! 20020206     ronny              Yeah, and I removed it again...
  26 *!
  27 *! ---------------------------------------------------------------------------
  28 *! (C) Copyright 1998-2002, Axis Communications AB, LUND, SWEDEN
  29 *!***************************************************************************/
  30
  31 /*
  32
  33    Misc notes:
  34
  35    It is very important to keep this file short. This and the boot
  36    interface specific parts must fit into the first boot packet.
  37
  38 */
  39
  40 /****************** INCLUDE FILES SECTION ***********************************/
  41
  42 #include "hwregs.h"
  43 #include "e100boot.h"
  44
  45 /****************** CONSTANT AND MACRO SECTION ******************************/
  46
  47 /****************** TYPE DEFINITION SECTION *********************************/
  48
  49 /****************** LOCAL FUNCTION DECLARATION SECTION **********************/
  50
  51 static int timeout(void);
  52
  53 /****************** GLOBAL VARIABLE DECLARATION SECTION *********************/
  54
  55 udword  nbr_read;       /* How many bytes has been read from current file */
  56 byte    interface;      /* Which I/O interface is the current one */
  57 byte    set_dest;       /* Have we set the destination address in tx_header */
  58 udword  last_timeout;
  59
  60 struct packet_header_T tx_header;
  61 dma_descr_T tx_descr;   /* For packet header */
  62 dma_descr_T tx_descr2;  /* packet data */
  63
  64 struct packet_header_T rx_header;
  65 dma_descr_T rx_descr;   /* For packet header */
  66 dma_descr_T rx_descr2;  /* packet data */
  67
  68 udword seq;             /* Sequence number of next wanted packet */
  69 byte serial_up;
  70
  71 /****************** LOCAL VARIABLE DECLARATION SECTION **********************/
  72
  73 /****************** FUNCTION DEFINITION SECTION *****************************/
  74
  75 void
  76 crt1(void)
  77 {
  78   /* Do this only once so we don't reset the timers and destroy the 32
  79      bit timer-register used as random number generator */
  80
  81   REG_SET__R_TIMER_CTRL(
  82                         timerdiv1, 0,
  83                         timerdiv0, 0,
  84                         presc_timer1, normal,
  85                         i1,        clr,
  86                         tm1,       run,
  87                         clksel1,   cascade0,
  88                         presc_ext, prescale,
  89                         i0,        clr,
  90                         tm0,       run,
  91                         clksel0,   c9600Hz);
  92
  93   REG_SET__R_TIMER_CTRL(
  94                         timerdiv1, 0,
  95                         timerdiv0, 0,
  96                         presc_timer1, normal,
  97                         i1,        nop,
  98                         tm1,       run,
  99                         clksel1,   cascade0,
 100                         presc_ext, prescale,
 101                         i0,        nop,
 102                         tm0,       run,
 103                         clksel0,   c9600Hz);
 104
 105   start();
 106 }
 107
 108 void
 109 start(void)
 110 {
 111 #if USE_LEDS
 112   REG_SET__R_PORT_PA_DIR(
 113                          dir7, output,
 114                          dir6, output,
 115                          dir5, output,
 116                          dir4, output,
 117                          dir3, output,
 118                          dir2, output,
 119                          dir1, output,
 120                          dir0, input);  /* not for prodtest */
 121
 122   REG_SET__R_PORT_PA_DATA(data_out, 0);
 123
 124   REG_SET__R_PORT_PB_DIR(
 125                          dir7, output,
 126                          dir6, output,
 127                          dir5, output,
 128                          dir4, output,
 129                          dir3, output,
 130                          dir2, output,
 131                          dir1, output,
 132                          dir0, output);
 133
 134   REG_SET__R_PORT_PB_DATA(data_out, 0xff);
 135 #endif
 136
 137   /* We must initialize all (global) variables here, since the .data
 138      and .bss area are used before they are loaded. */
 139
 140   //serial_up        = FALSE;
 141   nbr_read         = 0;
 142
 143   /* Get a random value to use as id. */
 144   tx_header.id     = htonl(REG_RD(R_TIMER_DATA));
 145
 146   /* timer01 is used as timer. */
 147   last_timeout     = REG_GET(R_TIMER01_DATA, count);
 148
 149   interface        = REG_GET(R_BUS_STATUS, boot) - 1; /* 0,1,2 */
 150   rx_descr2.status = 0;
 151
 152   /* Initialize the boot interface */
 153   init_interface();
 154   send_ack();   /* Ack the first bootpacket, i.e. this code. seq 0. */
 155
 156   while (1) {
 157     if (read_data()) {
 158       if (nbr_read >= (udword)bytes_to_read) {
 159         break;
 160       }
 161       else if (interface == NETWORK) {
 162         REG_SET(R_DMA_CH1_CMD, cmd, start);
 163       }
 164     }
 165   }
 166
 167 #if USE_LEDS
 168   REG_SET(R_PORT_PA_DATA, data_out, 0x55);
 169 #endif
 170
 171   level2_boot();
 172 }
 173
 174 int
 175 read_data(void)
 176 {
 177   if (handle_read()) {
 178     return TRUE;
 179   }
 180
 181   if (timeout()) {
 182     send_ack();
 183   }
 184
 185   return FALSE;
 186 }
 187
 188 int
 189 timeout(void)
 190 {
 191   volatile int now = REG_GET(R_TIMER01_DATA, count);
 192   int elapsed;
 193   int wait_time = 9600;
 194
 195   elapsed = last_timeout - now;
 196
 197   if (elapsed < 0) {
 198     elapsed = -elapsed;
 199   }
 200
 201   if (elapsed > wait_time) {
 202     last_timeout = now;
 203     return TRUE;
 204   }
 205
 206   return FALSE;
 207 }
 208
 209 /****************** END OF FILE common_init.c *******************************/