source: trunk/minix/drivers/dp8390/3c503.c@ 15

Last change on this file since 15 was 9, checked in by Mattia Monga, 14 years ago

Minix 3.1.2a
File size: 6.2 KB
RevLine 
[9]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 *===========================================================================*/
34static void el2_init(dep)
35dpeth_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 *===========================================================================*/
123static void el2_stop(dep)
124dpeth_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 *===========================================================================*/
138int el2_probe(dep)
139dpeth_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
187static 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 */
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