drivers/dpeth/3c503.c

   1 /*
   2 **  File:       3c503.c         Dec. 20, 1996
   3 **
   4 **  Author:     Giovanni Falzoni <gfalzoni@inwind.it>
   5 **
   6 **  Driver for the Etherlink II boards.  Works in shared memory mode.
   7 **  Programmed I/O could be used as well but would result in poor
   8 **  performances. This file contains only the board specific code,
   9 **  the rest is in 8390.c        Code specific for ISA bus only
  10 */
  11
  12 #include <minix/drivers.h>
  13 #include <net/gen/ether.h>
  14 #include <net/gen/eth_io.h>
  15 #include "dp.h"
  16
  17 #if (ENABLE_3C503 == 1)
  18
  19 #include "8390.h"
  20 #include "3c503.h"
  21
  22 /*
  23 **  Name:       void el2_init(dpeth_t *dep);
  24 **  Function:   Initalize hardware and data structures.
  25 */
  26 static void el2_init(dpeth_t * dep)
  27 {
  28   int ix, irq;
  29   int sendq_nr;
  30   int cntr;
  31
  32   /* Map the address PROM to lower I/O address range */
  33   cntr = inb_el2(dep, EL2_CNTR);
  34   outb_el2(dep, EL2_CNTR, cntr | ECNTR_SAPROM);
  35
  36   /* Read station address from PROM */
  37   for (ix = EL2_EA0; ix <= EL2_EA5; ix += 1)
  38         dep->de_address.ea_addr[ix] = inb_el2(dep, ix);
  39
  40   /* Map the 8390 back to lower I/O address range */
  41   outb_el2(dep, EL2_CNTR, cntr);
  42
  43   /* Enable memory, but turn off interrupts until we are ready */
  44   outb_el2(dep, EL2_CFGR, ECFGR_IRQOFF);
  45
  46   dep->de_data_port = dep->de_dp8390_port = dep->de_base_port;
  47   dep->de_prog_IO = FALSE;      /* Programmed I/O not yet available */
  48
  49   /* Check width of data bus */
  50   outb_el2(dep, DP_CR, CR_PS_P0 | CR_NO_DMA | CR_STP);
  51   outb_el2(dep, DP_DCR, 0);
  52   outb_el2(dep, DP_CR, CR_PS_P2 | CR_NO_DMA | CR_STP);
  53   dep->de_16bit = (inb_el2(dep, DP_DCR) & DCR_WTS) != 0;
  54   outb_el2(dep, DP_CR, CR_PS_P0 | CR_NO_DMA | CR_STP);
  55
  56   /* Allocate one send buffer (1.5kb) per 8kb of on board memory. */
  57   /* Only 8kb of 3c503/16 boards are used to avoid specific routines */
  58   sendq_nr = dep->de_ramsize / 0x2000;
  59   if (sendq_nr < 1)
  60         sendq_nr = 1;
  61   else if (sendq_nr > SENDQ_NR)
  62         sendq_nr = SENDQ_NR;
  63
  64   dep->de_sendq_nr = sendq_nr;
  65   for (ix = 0; ix < sendq_nr; ix++)
  66         dep->de_sendq[ix].sq_sendpage = (ix * SENDQ_PAGES) + EL2_SM_START_PG;
  67
  68   dep->de_startpage = (ix * SENDQ_PAGES) + EL2_SM_START_PG;
  69   dep->de_stoppage = EL2_SM_STOP_PG;
  70
  71   outb_el2(dep, EL2_STARTPG, dep->de_startpage);
  72   outb_el2(dep, EL2_STOPPG, dep->de_stoppage);
  73
  74   /* Point the vector pointer registers somewhere ?harmless?. */
  75   outb_el2(dep, EL2_VP2, 0xFF); /* Point at the ROM restart location    */
  76   outb_el2(dep, EL2_VP1, 0xFF); /* 0xFFFF:0000  (from original sources) */
  77   outb_el2(dep, EL2_VP0, 0x00); /* - What for protected mode? */
  78
  79   /* Set interrupt level for 3c503 */
  80   irq = (dep->de_irq &= ~DEI_DEFAULT);  /* Strip the default flag. */
  81   if (irq == 9) irq = 2;
  82   if (irq < 2 || irq > 5) panic("bad 3c503 irq configuration: %d", irq);
  83   outb_el2(dep, EL2_IDCFG, (0x04 << irq));
  84
  85   outb_el2(dep, EL2_DRQCNT, 0x08);      /* Set burst size to 8 */
  86   outb_el2(dep, EL2_DMAAH, EL2_SM_START_PG);    /* Put start of TX  */
  87   outb_el2(dep, EL2_DMAAL, 0x00);       /* buffer in the GA DMA reg */
  88
  89   outb_el2(dep, EL2_CFGR, ECFGR_NORM);  /* Enable shared memory */
  90
  91   ns_init(dep);                 /* Initialize DP controller */
  92
  93   printf("%s: Etherlink II%s (%s) at %X:%d:%05lX - ",
  94          dep->de_name, dep->de_16bit ? "/16" : "", "3c503",
  95          dep->de_base_port, dep->de_irq,
  96          dep->de_linmem + dep->de_offset_page);
  97   for (ix = 0; ix < SA_ADDR_LEN; ix += 1)
  98         printf("%02X%c", dep->de_address.ea_addr[ix],
  99                ix < SA_ADDR_LEN - 1 ? ':' : '\n');
 100   return;
 101 }
 102
 103 /*
 104 **  Name:       void el2_stop(dpeth_t *dep);
 105 **  Function:   Stops board by disabling interrupts.
 106 */
 107 static void el2_stop(dpeth_t * dep)
 108 {
 109
 110   outb_el2(dep, EL2_CFGR, ECFGR_IRQOFF);
 111   sys_irqdisable(&dep->de_hook);        /* disable interrupts */
 112   return;
 113 }
 114
 115 /*
 116 **  Name:       void el2_probe(dpeth_t *dep);
 117 **  Function:   Probe for the presence of an EtherLink II card.
 118 **              Initialize memory addressing if card detected.
 119 */
 120 int el2_probe(dpeth_t * dep)
 121 {
 122   int iobase, membase;
 123   int thin;
 124
 125   /* Thin ethernet or AUI? */
 126   thin = (dep->de_linmem & 1) ? ECNTR_AUI : ECNTR_THIN;
 127
 128   /* Location registers should have 1 bit set */
 129   if (!(iobase = inb_el2(dep, EL2_IOBASE))) return FALSE;
 130   if (!((membase = inb_el2(dep, EL2_MEMBASE)) & 0xF0)) return FALSE;
 131   if ((iobase & (iobase - 1)) || (membase & (membase - 1))) return FALSE;
 132
 133   /* Resets board */
 134   outb_el2(dep, EL2_CNTR, ECNTR_RESET | thin);
 135   milli_delay(1);
 136   outb_el2(dep, EL2_CNTR, thin);
 137   milli_delay(5);
 138
 139   /* Map the address PROM to lower I/O address range */
 140   outb_el2(dep, EL2_CNTR, ECNTR_SAPROM | thin);
 141   if (inb_el2(dep, EL2_EA0) != 0x02 ||  /* Etherlink II Station address */
 142       inb_el2(dep, EL2_EA1) != 0x60 ||  /* MUST be 02:60:8c:xx:xx:xx */
 143       inb_el2(dep, EL2_EA2) != 0x8C)
 144         return FALSE;           /* No Etherlink board at this address */
 145
 146   /* Map the 8390 back to lower I/O address range */
 147   outb_el2(dep, EL2_CNTR, thin);
 148
 149   /* Setup shared memory addressing for 3c503 */
 150   dep->de_linmem = ((membase & 0xC0) ? EL2_BASE_0D8000 : EL2_BASE_0C8000) +
 151         ((membase & 0xA0) ? (EL2_BASE_0CC000 - EL2_BASE_0C8000) : 0x0000);
 152
 153   /* Shared memory starts at 0x2000 (8kb window) */
 154   dep->de_offset_page = (EL2_SM_START_PG * DP_PAGESIZE);
 155   dep->de_linmem -= dep->de_offset_page;
 156   dep->de_ramsize = (EL2_SM_STOP_PG - EL2_SM_START_PG) * DP_PAGESIZE;
 157
 158   /* Board initialization and stop functions */
 159   dep->de_initf = el2_init;
 160   dep->de_stopf = el2_stop;
 161   return TRUE;
 162 }
 163 #endif                          /* ENABLE_3C503 */
 164
 165 /** 3c503.c **/