drivers/dp8390/3c503.c

   1 /*
   2  *      3c503.c         A shared memory driver for Etherlink II board.
   3  *
   4  *      Created:        Dec. 20, 1996 by G. Falzoni <falzoni@marina.scn.de>
   5  *
   6  *      Inspired by the TNET package by M. Ostrowski, the driver for Linux
   7  *      by D. Becker, the Crynwr 3c503 packet driver, and the Amoeba driver.
   8  *
   9  *      It works in shared memory mode and should be used with the
  10  *      device driver for NS 8390 based cards of Minix.  Programmed
  11  *      I/O could be used as well but would result in poor performance.
  12  */
  13
  14 #include "../drivers.h"
  15
  16 #include <net/gen/ether.h>
  17 #include <net/gen/eth_io.h>
  18
  19 #include "local.h"
  20 #include "dp8390.h"
  21 #include "3c503.h"
  22
  23 #if ENABLE_3C503
  24
  25 #define MILLIS_TO_TICKS(m)  (((m)*HZ/1000)+1)
  26
  27 _PROTOTYPE(static void el2_init, (dpeth_t *dep));
  28 _PROTOTYPE(static void el2_stop, (dpeth_t *dep));
  29 _PROTOTYPE( static void milli_delay, (unsigned long millis)             );
  30
  31 /*===========================================================================*
  32  *                              el2_init                                     *
  33  *===========================================================================*/
  34 static void el2_init(dep)
  35 dpeth_t * dep;
  36 {
  37   /* Initalize hardware and data structures. */
  38   int ix, irq;
  39   int sendq_nr;
  40   int cntr;
  41
  42   /* Map the address PROM to lower I/O address range */
  43   cntr = inb_el2(dep, EL2_CNTR);
  44   outb_el2(dep, EL2_CNTR, cntr | ECNTR_SAPROM);
  45
  46   /* Read station address from PROM */
  47   for (ix = EL2_EA0; ix <= EL2_EA5; ix += 1)
  48         dep->de_address.ea_addr[ix] = inb_el2(dep, ix);
  49
  50   /* Map the 8390 back to lower I/O address range */
  51   outb_el2(dep, EL2_CNTR, cntr);
  52
  53   /* Enable memory, but turn off interrupts until we are ready */
  54   outb_el2(dep, EL2_CFGR, ECFGR_IRQOFF);
  55
  56   dep->de_data_port = dep->de_dp8390_port = dep->de_base_port;
  57   dep->de_prog_IO = 0;          /* Programmed I/O not yet available */
  58
  59   /* Check width of data bus:
  60    * 1. Write 0 to WTS bit.  The board will drive it to 1 if it is a
  61    *    16-bit card.
  62    * 2. Select page 2
  63    * 3. See if it is a 16-bit card
  64    * 4. Select page 0
  65    */
  66   outb_el2(dep, DP_CR, CR_PS_P0|CR_DM_ABORT|CR_STP);
  67   outb_el2(dep, DP_DCR, 0);
  68   outb_el2(dep, DP_CR, CR_PS_P2|CR_DM_ABORT|CR_STP);
  69   dep->de_16bit = (inb_el2(dep, DP_DCR) & DCR_WTS) != 0;
  70   outb_el2(dep, DP_CR, CR_PS_P0|CR_DM_ABORT|CR_STP);
  71
  72   /* Allocate one send buffer (1.5KB) per 8KB of on board memory. */
  73   sendq_nr = (dep->de_ramsize - dep->de_offset_page) / 0x2000;
  74   if (sendq_nr < 1)
  75         sendq_nr = 1;
  76   else if (sendq_nr > SENDQ_NR)
  77         sendq_nr = SENDQ_NR;
  78
  79   dep->de_sendq_nr = sendq_nr;
  80   for (ix = 0; ix < sendq_nr; ix++)
  81         dep->de_sendq[ix].sq_sendpage = (ix * SENDQ_PAGES) + EL2_SM_START_PG;
  82
  83   dep->de_startpage = (ix * SENDQ_PAGES) + EL2_SM_START_PG;
  84   dep->de_stoppage = EL2_SM_STOP_PG;
  85
  86   outb_el2(dep, EL2_STARTPG, dep->de_startpage);
  87   outb_el2(dep, EL2_STOPPG, dep->de_stoppage);
  88
  89   /* Point the vector pointer registers somewhere ?harmless?. */
  90   outb_el2(dep, EL2_VP2, 0xFF); /* Point at the ROM restart location    */
  91   outb_el2(dep, EL2_VP1, 0xFF); /* 0xFFFF:0000  (from original sources) */
  92   outb_el2(dep, EL2_VP0, 0x00); /*           - What for protected mode? */
  93
  94   /* Set interrupt level for 3c503 */
  95   irq = (dep->de_irq &= ~DEI_DEFAULT);  /* Strip the default flag. */
  96   if (irq == 9) irq = 2;
  97   if (irq < 2 || irq > 5) panic("", "bad 3c503 irq configuration", irq);
  98   outb_el2(dep, EL2_IDCFG, (0x04 << irq));
  99
 100   outb_el2(dep, EL2_DRQCNT, 0x08);      /* Set burst size to 8 */
 101   outb_el2(dep, EL2_DMAAH, EL2_SM_START_PG);    /* Put start of TX  */
 102   outb_el2(dep, EL2_DMAAL, 0x00);       /* buffer in the GA DMA reg */
 103
 104   outb_el2(dep, EL2_CFGR, ECFGR_NORM);  /* Enable shared memory */
 105
 106   if (!debug) {
 107         printf("%s: 3c503 at %X:%d:%lX\n",
 108                 dep->de_name, dep->de_base_port, dep->de_irq,
 109                 dep->de_linmem + dep->de_offset_page);
 110   } else {
 111         printf("%s: 3Com Etherlink II %sat I/O address 0x%X, "
 112                         "memory address 0x%lX, irq %d\n",
 113                 dep->de_name, dep->de_16bit ? "(16-bit) " : "",
 114                 dep->de_base_port,
 115                 dep->de_linmem + dep->de_offset_page,
 116                 dep->de_irq);
 117   }
 118 }
 119
 120 /*===========================================================================*
 121  *                              el2_stop                                     *
 122  *===========================================================================*/
 123 static void el2_stop(dep)
 124 dpeth_t * dep;
 125 {
 126   /* Stops board by disabling interrupts. */
 127
 128 #if DEBUG
 129   printf("%s: stopping Etherlink\n", dep->de_name);
 130 #endif
 131   outb_el2(dep, EL2_CFGR, ECFGR_IRQOFF);
 132   return;
 133 }
 134
 135 /*===========================================================================*
 136  *                              el2_probe                                    *
 137  *===========================================================================*/
 138 int el2_probe(dep)
 139 dpeth_t * dep;
 140 {
 141   /* Probe for the presence of an EtherLink II card.  Initialize memory
 142    * addressing if card detected.
 143    */
 144   int iobase, membase;
 145   int thin;
 146
 147   /* Thin ethernet or AUI? */
 148   thin = (dep->de_linmem & 1) ? ECNTR_AUI : ECNTR_THIN;
 149
 150   /* Location registers should have 1 bit set */
 151   if (!(iobase = inb_el2(dep, EL2_IOBASE))) return 0;
 152   if (!((membase = inb_el2(dep, EL2_MEMBASE)) & 0xF0)) return 0;
 153   if ((iobase & (iobase - 1)) || (membase & (membase - 1))) return 0;
 154
 155   /* Resets board */
 156   outb_el2(dep, EL2_CNTR, ECNTR_RESET | thin);
 157   milli_delay(1);
 158   outb_el2(dep, EL2_CNTR, thin);
 159   milli_delay(5);
 160
 161   /* Map the address PROM to lower I/O address range */
 162   outb_el2(dep, EL2_CNTR, ECNTR_SAPROM | thin);
 163   if (inb_el2(dep, EL2_EA0) != 0x02 ||  /* Etherlink II Station address */
 164       inb_el2(dep, EL2_EA1) != 0x60 ||  /* MUST be 02:60:8c:xx:xx:xx */
 165       inb_el2(dep, EL2_EA2) != 0x8C)
 166         return 0;               /* No Etherlink board at this address */
 167
 168   /* Map the 8390 back to lower I/O address range */
 169   outb_el2(dep, EL2_CNTR, thin);
 170
 171   /* Setup shared memory addressing for 3c503 */
 172   dep->de_linmem = ((membase & 0xC0) ? EL2_BASE_0D8000 : EL2_BASE_0C8000) +
 173         ((membase & 0xA0) ? (EL2_BASE_0CC000 - EL2_BASE_0C8000) : 0x0000);
 174   dep->de_offset_page = (EL2_SM_START_PG * DP_PAGESIZE);
 175   dep->de_ramsize = (EL2_SM_STOP_PG - EL2_SM_START_PG) * DP_PAGESIZE;
 176
 177   /* (Bad kludge, something Philip needs to look into. -- kjb) */
 178   dep->de_linmem -= dep->de_offset_page;
 179   dep->de_ramsize += dep->de_offset_page;
 180
 181   /* Board initialization and stop functions */
 182   dep->de_initf = el2_init;
 183   dep->de_stopf = el2_stop;
 184   return 1;
 185 }
 186
 187 static void milli_delay(unsigned long millis)
 188 {
 189         tickdelay(MILLIS_TO_TICKS(millis));
 190 }
 191
 192 #endif /* ENABLE_3C503 */
 193
 194 /** 3c503.c **/
 195
 196 /*
 197  * $PchId: 3c503.c,v 1.3 2003/09/10 15:33:04 philip Exp $
 198  */