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 <minix/drivers.h>
15 #include <minix/netdriver.h>
16
17 #include "local.h"
18 #include "dp8390.h"
19 #include "3c503.h"
20
21 #if ENABLE_3C503
22
23 extern u32_t system_hz;
24
25 #define MILLIS_TO_TICKS(m) (((m)*system_hz/1000)+1)
26
27 static void el2_init(dpeth_t *dep);
28 static void el2_stop(dpeth_t *dep);
29
30 /*===========================================================================*
31 * el2_init *
32 *===========================================================================*/
el2_init(dep)33 static void el2_init(dep)
34 dpeth_t * dep;
35 {
36 /* Initalize hardware and data structures. */
37 int ix, irq;
38 int sendq_nr;
39 int cntr;
40
41 /* Map the address PROM to lower I/O address range */
42 cntr = inb_el2(dep, EL2_CNTR);
43 outb_el2(dep, EL2_CNTR, cntr | ECNTR_SAPROM);
44
45 /* Read station address from PROM */
46 for (ix = EL2_EA0; ix <= EL2_EA5; ix += 1)
47 dep->de_address.na_addr[ix] = inb_el2(dep, ix);
48
49 /* Map the 8390 back to lower I/O address range */
50 outb_el2(dep, EL2_CNTR, cntr);
51
52 /* Enable memory, but turn off interrupts until we are ready */
53 outb_el2(dep, EL2_CFGR, ECFGR_IRQOFF);
54
55 dep->de_data_port = dep->de_dp8390_port = dep->de_base_port;
56 dep->de_prog_IO = 0; /* Programmed I/O not yet available */
57
58 /* Check width of data bus:
59 * 1. Write 0 to WTS bit. The board will drive it to 1 if it is a
60 * 16-bit card.
61 * 2. Select page 2
62 * 3. See if it is a 16-bit card
63 * 4. Select page 0
64 */
65 outb_el2(dep, DP_CR, CR_PS_P0|CR_DM_ABORT|CR_STP);
66 outb_el2(dep, DP_DCR, 0);
67 outb_el2(dep, DP_CR, CR_PS_P2|CR_DM_ABORT|CR_STP);
68 dep->de_16bit = (inb_el2(dep, DP_DCR) & DCR_WTS) != 0;
69 outb_el2(dep, DP_CR, CR_PS_P0|CR_DM_ABORT|CR_STP);
70
71 /* Allocate one send buffer (1.5KB) per 8KB of on board memory. */
72 sendq_nr = (dep->de_ramsize - dep->de_offset_page) / 0x2000;
73 if (sendq_nr < 1)
74 sendq_nr = 1;
75 else if (sendq_nr > SENDQ_NR)
76 sendq_nr = SENDQ_NR;
77
78 dep->de_sendq_nr = sendq_nr;
79 for (ix = 0; ix < sendq_nr; ix++)
80 dep->de_sendq[ix].sq_sendpage = (ix * SENDQ_PAGES) + EL2_SM_START_PG;
81
82 dep->de_startpage = (ix * SENDQ_PAGES) + EL2_SM_START_PG;
83 dep->de_stoppage = EL2_SM_STOP_PG;
84
85 outb_el2(dep, EL2_STARTPG, dep->de_startpage);
86 outb_el2(dep, EL2_STOPPG, dep->de_stoppage);
87
88 /* Point the vector pointer registers somewhere ?harmless?. */
89 outb_el2(dep, EL2_VP2, 0xFF); /* Point at the ROM restart location */
90 outb_el2(dep, EL2_VP1, 0xFF); /* 0xFFFF:0000 (from original sources) */
91 outb_el2(dep, EL2_VP0, 0x00); /* - What for protected mode? */
92
93 /* Set interrupt level for 3c503 */
94 irq = (dep->de_irq &= ~DEI_DEFAULT); /* Strip the default flag. */
95 if (irq == 9) irq = 2;
96 if (irq < 2 || irq > 5) panic("bad 3c503 irq configuration: %d", irq);
97 outb_el2(dep, EL2_IDCFG, (0x04 << irq));
98
99 outb_el2(dep, EL2_DRQCNT, 0x08); /* Set burst size to 8 */
100 outb_el2(dep, EL2_DMAAH, EL2_SM_START_PG); /* Put start of TX */
101 outb_el2(dep, EL2_DMAAL, 0x00); /* buffer in the GA DMA reg */
102
103 outb_el2(dep, EL2_CFGR, ECFGR_NORM); /* Enable shared memory */
104
105 if (!debug) {
106 printf("%s: 3c503 at %X:%d:%lX\n",
107 netdriver_name(), dep->de_base_port, dep->de_irq,
108 dep->de_linmem + dep->de_offset_page);
109 } else {
110 printf("%s: 3Com Etherlink II %sat I/O address 0x%X, "
111 "memory address 0x%lX, irq %d\n",
112 netdriver_name(), dep->de_16bit ? "(16-bit) " : "",
113 dep->de_base_port,
114 dep->de_linmem + dep->de_offset_page,
115 dep->de_irq);
116 }
117 }
118
119 /*===========================================================================*
120 * el2_stop *
121 *===========================================================================*/
el2_stop(dep)122 static void el2_stop(dep)
123 dpeth_t * dep;
124 {
125 /* Stops board by disabling interrupts. */
126
127 #if DEBUG
128 printf("%s: stopping Etherlink\n", netdriver_name());
129 #endif
130 outb_el2(dep, EL2_CFGR, ECFGR_IRQOFF);
131 return;
132 }
133
134 /*===========================================================================*
135 * el2_probe *
136 *===========================================================================*/
el2_probe(dep)137 int el2_probe(dep)
138 dpeth_t * dep;
139 {
140 /* Probe for the presence of an EtherLink II card. Initialize memory
141 * addressing if card detected.
142 */
143 int iobase, membase;
144 int thin;
145
146 /* Thin ethernet or AUI? */
147 thin = (dep->de_linmem & 1) ? ECNTR_AUI : ECNTR_THIN;
148
149 /* Location registers should have 1 bit set */
150 if (!(iobase = inb_el2(dep, EL2_IOBASE))) return 0;
151 if (!((membase = inb_el2(dep, EL2_MEMBASE)) & 0xF0)) return 0;
152 if ((iobase & (iobase - 1)) || (membase & (membase - 1))) return 0;
153
154 /* Resets board */
155 outb_el2(dep, EL2_CNTR, ECNTR_RESET | thin);
156 micro_delay(1000);
157 outb_el2(dep, EL2_CNTR, thin);
158 micro_delay(5000);
159
160 /* Map the address PROM to lower I/O address range */
161 outb_el2(dep, EL2_CNTR, ECNTR_SAPROM | thin);
162 if (inb_el2(dep, EL2_EA0) != 0x02 || /* Etherlink II Station address */
163 inb_el2(dep, EL2_EA1) != 0x60 || /* MUST be 02:60:8c:xx:xx:xx */
164 inb_el2(dep, EL2_EA2) != 0x8C)
165 return 0; /* No Etherlink board at this address */
166
167 /* Map the 8390 back to lower I/O address range */
168 outb_el2(dep, EL2_CNTR, thin);
169
170 /* Setup shared memory addressing for 3c503 */
171 dep->de_linmem = ((membase & 0xC0) ? EL2_BASE_0D8000 : EL2_BASE_0C8000) +
172 ((membase & 0xA0) ? (EL2_BASE_0CC000 - EL2_BASE_0C8000) : 0x0000);
173 dep->de_offset_page = (EL2_SM_START_PG * DP_PAGESIZE);
174 dep->de_ramsize = (EL2_SM_STOP_PG - EL2_SM_START_PG) * DP_PAGESIZE;
175
176 /* (Bad kludge, something Philip needs to look into. -- kjb) */
177 dep->de_linmem -= dep->de_offset_page;
178 dep->de_ramsize += dep->de_offset_page;
179
180 /* Board initialization and stop functions */
181 dep->de_initf = el2_init;
182 dep->de_stopf = el2_stop;
183 return 1;
184 }
185
186 #endif /* ENABLE_3C503 */
187
188 /** 3c503.c **/
189
190 /*
191 * $PchId: 3c503.c,v 1.3 2003/09/10 15:33:04 philip Exp $
192 */
193