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1.1 root 1: /* smc-ultra32.c: An SMC Ultra32 EISA ethernet driver for linux.
2:
3: Sources:
4:
5: This driver is based on (cloned from) the ISA SMC Ultra driver
6: written by Donald Becker. Modifications to support the EISA
7: version of the card by Paul Gortmaker and Leonard N. Zubkoff.
8:
9: This software may be used and distributed according to the terms
10: of the GNU Public License, incorporated herein by reference.
11:
12: Theory of Operation:
13:
14: The SMC Ultra32C card uses the SMC 83c790 chip which is also
15: found on the ISA SMC Ultra cards. It has a shared memory mode of
16: operation that makes it similar to the ISA version of the card.
17: The main difference is that the EISA card has 32KB of RAM, but
18: only an 8KB window into that memory. The EISA card also can be
19: set for a bus-mastering mode of operation via the ECU, but that
20: is not (and probably will never be) supported by this driver.
21: The ECU should be run to enable shared memory and to disable the
22: bus-mastering feature for use with linux.
23:
24: By programming the 8390 to use only 8KB RAM, the modifications
25: to the ISA driver can be limited to the probe and initialization
26: code. This allows easy integration of EISA support into the ISA
27: driver. However, the driver development kit from SMC provided the
28: register information for sliding the 8KB window, and hence the 8390
29: is programmed to use the full 32KB RAM.
30:
31: Unfortunately this required code changes outside the probe/init
32: routines, and thus we decided to separate the EISA driver from
33: the ISA one. In this way, ISA users don't end up with a larger
34: driver due to the EISA code, and EISA users don't end up with a
35: larger driver due to the ISA EtherEZ PIO code. The driver is
36: similar to the 3c503/16 driver, in that the window must be set
37: back to the 1st 8KB of space for access to the two 8390 Tx slots.
38:
39: In testing, using only 8KB RAM (3 Tx / 5 Rx) didn't appear to
40: be a limiting factor, since the EISA bus could get packets off
41: the card fast enough, but having the use of lots of RAM as Rx
42: space is extra insurance if interrupt latencies become excessive.
43:
44: */
45:
46: static const char *version = "smc-ultra32.c: 06/97 v1.00\n";
47:
48:
49: #include <linux/module.h>
50: #include <linux/kernel.h>
51: #include <linux/sched.h>
52: #include <linux/errno.h>
53: #include <linux/string.h>
54:
55: #include <asm/io.h>
56: #include <asm/system.h>
57:
58: #include <linux/netdevice.h>
59: #include <linux/etherdevice.h>
60: #include "8390.h"
61:
62: int ultra32_probe(struct device *dev);
63: int ultra32_probe1(struct device *dev, int ioaddr);
64: static int ultra32_open(struct device *dev);
65: static void ultra32_reset_8390(struct device *dev);
66: static void ultra32_get_8390_hdr(struct device *dev, struct e8390_pkt_hdr *hdr,
67: int ring_page);
68: static void ultra32_block_input(struct device *dev, int count,
69: struct sk_buff *skb, int ring_offset);
70: static void ultra32_block_output(struct device *dev, int count,
71: const unsigned char *buf, const int start_page);
72: static int ultra32_close(struct device *dev);
73:
74: #define ULTRA32_CMDREG 0 /* Offset to ASIC command register. */
75: #define ULTRA32_RESET 0x80 /* Board reset, in ULTRA32_CMDREG. */
76: #define ULTRA32_MEMENB 0x40 /* Enable the shared memory. */
77: #define ULTRA32_NIC_OFFSET 16 /* NIC register offset from the base_addr. */
78: #define ULTRA32_IO_EXTENT 32
79: #define EN0_ERWCNT 0x08 /* Early receive warning count. */
80:
81: /*
82: * Defines that apply only to the Ultra32 EISA card. Note that
83: * "smc" = 10011 01101 00011 = 0x4da3, and hence !smc8010.cfg translates
84: * into an EISA ID of 0x1080A34D
85: */
86: #define ULTRA32_BASE 0xca0
87: #define ULTRA32_ID 0x1080a34d
88: #define ULTRA32_IDPORT (-0x20) /* 0xc80 */
89: /* Config regs 1->7 from the EISA !SMC8010.CFG file. */
90: #define ULTRA32_CFG1 0x04 /* 0xca4 */
91: #define ULTRA32_CFG2 0x05 /* 0xca5 */
92: #define ULTRA32_CFG3 (-0x18) /* 0xc88 */
93: #define ULTRA32_CFG4 (-0x17) /* 0xc89 */
94: #define ULTRA32_CFG5 (-0x16) /* 0xc8a */
95: #define ULTRA32_CFG6 (-0x15) /* 0xc8b */
96: #define ULTRA32_CFG7 0x0d /* 0xcad */
97:
98:
99: /* Probe for the Ultra32. This looks like a 8013 with the station
100: address PROM at I/O ports <base>+8 to <base>+13, with a checksum
101: following.
102: */
103:
104: int ultra32_probe(struct device *dev)
105: {
106: const char *ifmap[] = {"UTP No Link", "", "UTP/AUI", "UTP/BNC"};
107: int ioaddr, edge, media;
108:
109: if (!EISA_bus) return ENODEV;
110:
111: /* EISA spec allows for up to 16 slots, but 8 is typical. */
112: for (ioaddr = 0x1000 + ULTRA32_BASE; ioaddr < 0x9000; ioaddr += 0x1000)
113: if (check_region(ioaddr, ULTRA32_IO_EXTENT) == 0 &&
114: inb(ioaddr + ULTRA32_IDPORT) != 0xff &&
115: inl(ioaddr + ULTRA32_IDPORT) == ULTRA32_ID) {
116: media = inb(ioaddr + ULTRA32_CFG7) & 0x03;
117: edge = inb(ioaddr + ULTRA32_CFG5) & 0x08;
118: printk("SMC Ultra32 in EISA Slot %d, Media: %s, %s IRQs.\n",
119: ioaddr >> 12, ifmap[media],
120: (edge ? "Edge Triggered" : "Level Sensitive"));
121: if (ultra32_probe1(dev, ioaddr) == 0)
122: return 0;
123: }
124: return ENODEV;
125: }
126:
127: int ultra32_probe1(struct device *dev, int ioaddr)
128: {
129: int i;
130: int checksum = 0;
131: const char *model_name;
132: static unsigned version_printed = 0;
133: /* Values from various config regs. */
134: unsigned char idreg = inb(ioaddr + 7);
135: unsigned char reg4 = inb(ioaddr + 4) & 0x7f;
136:
137: /* Check the ID nibble. */
138: if ((idreg & 0xf0) != 0x20) /* SMC Ultra */
139: return ENODEV;
140:
141: /* Select the station address register set. */
142: outb(reg4, ioaddr + 4);
143:
144: for (i = 0; i < 8; i++)
145: checksum += inb(ioaddr + 8 + i);
146: if ((checksum & 0xff) != 0xff)
147: return ENODEV;
148:
149: /* We should have a "dev" from Space.c or the static module table. */
150: if (dev == NULL) {
151: printk("smc-ultra32.c: Passed a NULL device.\n");
152: dev = init_etherdev(0, 0);
153: }
154:
155: if (ei_debug && version_printed++ == 0)
156: printk(version);
157:
158: model_name = "SMC Ultra32";
159:
160: printk("%s: %s at 0x%X,", dev->name, model_name, ioaddr);
161:
162: for (i = 0; i < 6; i++)
163: printk(" %2.2X", dev->dev_addr[i] = inb(ioaddr + 8 + i));
164:
165: /* Switch from the station address to the alternate register set and
166: read the useful registers there. */
167: outb(0x80 | reg4, ioaddr + 4);
168:
169: /* Enable FINE16 mode to avoid BIOS ROM width mismatches @ reboot. */
170: outb(0x80 | inb(ioaddr + 0x0c), ioaddr + 0x0c);
171:
172: /* Reset RAM addr. */
173: outb(0x00, ioaddr + 0x0b);
174:
175: /* Switch back to the station address register set so that the
176: MS-DOS driver can find the card after a warm boot. */
177: outb(reg4, ioaddr + 4);
178:
179: if ((inb(ioaddr + ULTRA32_CFG5) & 0x40) == 0) {
180: printk("\nsmc-ultra32: Card RAM is disabled! "
181: "Run EISA config utility.\n");
182: return ENODEV;
183: }
184: if ((inb(ioaddr + ULTRA32_CFG2) & 0x04) == 0)
185: printk("\nsmc-ultra32: Ignoring Bus-Master enable bit. "
186: "Run EISA config utility.\n");
187:
188: if (dev->irq < 2) {
189: unsigned char irqmap[] = {0, 9, 3, 5, 7, 10, 11, 15};
190: int irq = irqmap[inb(ioaddr + ULTRA32_CFG5) & 0x07];
191: if (irq == 0) {
192: printk(", failed to detect IRQ line.\n");
193: return -EAGAIN;
194: }
195: dev->irq = irq;
196: }
197:
198: /* Allocate dev->priv and fill in 8390 specific dev fields. */
199: if (ethdev_init(dev)) {
200: printk (", no memory for dev->priv.\n");
201: return -ENOMEM;
202: }
203:
204: /* OK, we are certain this is going to work. Setup the device. */
205: request_region(ioaddr, ULTRA32_IO_EXTENT, model_name);
206:
207: /* The 8390 isn't at the base address, so fake the offset */
208: dev->base_addr = ioaddr + ULTRA32_NIC_OFFSET;
209:
210: /* Save RAM address in the unused reg0 to avoid excess inb's. */
211: ei_status.reg0 = inb(ioaddr + ULTRA32_CFG3) & 0xfc;
212:
213: dev->mem_start = 0xc0000 + ((ei_status.reg0 & 0x7c) << 11);
214:
215: ei_status.name = model_name;
216: ei_status.word16 = 1;
217: ei_status.tx_start_page = 0;
218: ei_status.rx_start_page = TX_PAGES;
219: /* All Ultra32 cards have 32KB memory with an 8KB window. */
220: ei_status.stop_page = 128;
221:
222: dev->rmem_start = dev->mem_start + TX_PAGES*256;
223: dev->mem_end = dev->rmem_end = dev->mem_start + 0x1fff;
224:
225: printk(", IRQ %d, 32KB memory, 8KB window at 0x%lx-0x%lx.\n",
226: dev->irq, dev->mem_start, dev->mem_end);
227: ei_status.block_input = &ultra32_block_input;
228: ei_status.block_output = &ultra32_block_output;
229: ei_status.get_8390_hdr = &ultra32_get_8390_hdr;
230: ei_status.reset_8390 = &ultra32_reset_8390;
231: dev->open = &ultra32_open;
232: dev->stop = &ultra32_close;
233: NS8390_init(dev, 0);
234:
235: return 0;
236: }
237:
238: static int ultra32_open(struct device *dev)
239: {
240: int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; /* ASIC addr */
241:
242: if (request_irq(dev->irq, ei_interrupt, 0, ei_status.name, dev))
243: return -EAGAIN;
244:
245: outb(ULTRA32_MEMENB, ioaddr); /* Enable Shared Memory. */
246: outb(0x80, ioaddr + ULTRA32_CFG6); /* Enable Interrupts. */
247: outb(0x84, ioaddr + 5); /* Enable MEM16 & Disable Bus Master. */
248: outb(0x01, ioaddr + 6); /* Enable Interrupts. */
249: /* Set the early receive warning level in window 0 high enough not
250: to receive ERW interrupts. */
251: outb_p(E8390_NODMA+E8390_PAGE0, dev->base_addr);
252: outb(0xff, dev->base_addr + EN0_ERWCNT);
253: ei_open(dev);
254: MOD_INC_USE_COUNT;
255: return 0;
256: }
257:
258: static int ultra32_close(struct device *dev)
259: {
260: int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; /* CMDREG */
261:
262: dev->start = 0;
263: dev->tbusy = 1;
264:
265: if (ei_debug > 1)
266: printk("%s: Shutting down ethercard.\n", dev->name);
267:
268: outb(0x00, ioaddr + ULTRA32_CFG6); /* Disable Interrupts. */
269: outb(0x00, ioaddr + 6); /* Disable interrupts. */
270: free_irq(dev->irq, dev);
271: irq2dev_map[dev->irq] = 0;
272:
273: NS8390_init(dev, 0);
274:
275: MOD_DEC_USE_COUNT;
276:
277: return 0;
278: }
279:
280: static void ultra32_reset_8390(struct device *dev)
281: {
282: int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET; /* ASIC base addr */
283:
284: outb(ULTRA32_RESET, ioaddr);
285: if (ei_debug > 1) printk("resetting Ultra32, t=%ld...", jiffies);
286: ei_status.txing = 0;
287:
288: outb(ULTRA32_MEMENB, ioaddr); /* Enable Shared Memory. */
289: outb(0x80, ioaddr + ULTRA32_CFG6); /* Enable Interrupts. */
290: outb(0x84, ioaddr + 5); /* Enable MEM16 & Disable Bus Master. */
291: outb(0x01, ioaddr + 6); /* Enable Interrupts. */
292: if (ei_debug > 1) printk("reset done\n");
293: return;
294: }
295:
296: /* Grab the 8390 specific header. Similar to the block_input routine, but
297: we don't need to be concerned with ring wrap as the header will be at
298: the start of a page, so we optimize accordingly. */
299:
300: static void ultra32_get_8390_hdr(struct device *dev,
301: struct e8390_pkt_hdr *hdr,
302: int ring_page)
303: {
304: unsigned long hdr_start = dev->mem_start + ((ring_page & 0x1f) << 8);
305: unsigned int RamReg = dev->base_addr - ULTRA32_NIC_OFFSET + ULTRA32_CFG3;
306:
307: /* Select correct 8KB Window. */
308: outb(ei_status.reg0 | ((ring_page & 0x60) >> 5), RamReg);
309:
310: #ifdef notdef
311: /* Officially this is what we are doing, but the readl() is faster */
312: memcpy_fromio(hdr, hdr_start, sizeof(struct e8390_pkt_hdr));
313: #else
314: ((unsigned int*)hdr)[0] = readl(hdr_start);
315: #endif
316: }
317:
318: /* Block input and output are easy on shared memory ethercards, the only
319: complication is when the ring buffer wraps, or in this case, when a
320: packet spans an 8KB boundary. Note that the current 8KB segment is
321: already set by the get_8390_hdr routine. */
322:
323: static void ultra32_block_input(struct device *dev,
324: int count,
325: struct sk_buff *skb,
326: int ring_offset)
327: {
328: unsigned long xfer_start = dev->mem_start + (ring_offset & 0x1fff);
329: unsigned int RamReg = dev->base_addr - ULTRA32_NIC_OFFSET + ULTRA32_CFG3;
330:
331: if ((ring_offset & ~0x1fff) != ((ring_offset + count - 1) & ~0x1fff)) {
332: int semi_count = 8192 - (ring_offset & 0x1FFF);
333: memcpy_fromio(skb->data, xfer_start, semi_count);
334: count -= semi_count;
335: if (ring_offset < 96*256) {
336: /* Select next 8KB Window. */
337: ring_offset += semi_count;
338: outb(ei_status.reg0 | ((ring_offset & 0x6000) >> 13), RamReg);
339: memcpy_fromio(skb->data + semi_count, dev->mem_start, count);
340: } else {
341: /* Select first 8KB Window. */
342: outb(ei_status.reg0, RamReg);
343: memcpy_fromio(skb->data + semi_count, dev->rmem_start, count);
344: }
345: } else {
346: /* Packet is in one chunk -- we can copy + cksum. */
347: eth_io_copy_and_sum(skb, xfer_start, count, 0);
348: }
349: }
350:
351: static void ultra32_block_output(struct device *dev,
352: int count,
353: const unsigned char *buf,
354: int start_page)
355: {
356: unsigned long xfer_start = dev->mem_start + (start_page<<8);
357: unsigned int RamReg = dev->base_addr - ULTRA32_NIC_OFFSET + ULTRA32_CFG3;
358:
359: /* Select first 8KB Window. */
360: outb(ei_status.reg0, RamReg);
361:
362: memcpy_toio(xfer_start, buf, count);
363: }
364:
365: #ifdef MODULE
366: #define MAX_ULTRA32_CARDS 4 /* Max number of Ultra cards per module */
367: #define NAMELEN 8 /* # of chars for storing dev->name */
368: static char namelist[NAMELEN * MAX_ULTRA32_CARDS] = { 0, };
369: static struct device dev_ultra[MAX_ULTRA32_CARDS] = {
370: {
371: NULL, /* assign a chunk of namelist[] below */
372: 0, 0, 0, 0,
373: 0, 0,
374: 0, 0, 0, NULL, NULL
375: },
376: };
377:
378: int init_module(void)
379: {
380: int this_dev, found = 0;
381:
382: for (this_dev = 0; this_dev < MAX_ULTRA32_CARDS; this_dev++) {
383: struct device *dev = &dev_ultra[this_dev];
384: dev->name = namelist+(NAMELEN*this_dev);
385: dev->init = ultra32_probe;
386: if (register_netdev(dev) != 0) {
387: if (found > 0) return 0; /* Got at least one. */
388: printk(KERN_WARNING "smc-ultra32.c: No SMC Ultra32 found.\n");
389: return -ENXIO;
390: }
391: found++;
392: }
393:
394: return 0;
395: }
396:
397: void cleanup_module(void)
398: {
399: int this_dev;
400:
401: for (this_dev = 0; this_dev < MAX_ULTRA32_CARDS; this_dev++) {
402: struct device *dev = &dev_ultra[this_dev];
403: if (dev->priv != NULL) {
404: /* NB: ultra32_close_card() does free_irq + irq2dev */
405: int ioaddr = dev->base_addr - ULTRA32_NIC_OFFSET;
406: kfree(dev->priv);
407: dev->priv = NULL;
408: release_region(ioaddr, ULTRA32_IO_EXTENT);
409: unregister_netdev(dev);
410: }
411: }
412: }
413: #endif /* MODULE */
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