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Commit | Line | Data |
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1da177e4 LT |
1 | /* znet.c: An Zenith Z-Note ethernet driver for linux. */ |
2 | ||
3 | /* | |
4 | Written by Donald Becker. | |
5 | ||
6 | The author may be reached as becker@scyld.com. | |
7 | This driver is based on the Linux skeleton driver. The copyright of the | |
8 | skeleton driver is held by the United States Government, as represented | |
9 | by DIRNSA, and it is released under the GPL. | |
10 | ||
11 | Thanks to Mike Hollick for alpha testing and suggestions. | |
12 | ||
13 | References: | |
14 | The Crynwr packet driver. | |
15 | ||
16 | "82593 CSMA/CD Core LAN Controller" Intel datasheet, 1992 | |
17 | Intel Microcommunications Databook, Vol. 1, 1990. | |
18 | As usual with Intel, the documentation is incomplete and inaccurate. | |
19 | I had to read the Crynwr packet driver to figure out how to actually | |
20 | use the i82593, and guess at what register bits matched the loosely | |
21 | related i82586. | |
22 | ||
23 | Theory of Operation | |
24 | ||
25 | The i82593 used in the Zenith Z-Note series operates using two(!) slave | |
26 | DMA channels, one interrupt, and one 8-bit I/O port. | |
27 | ||
28 | While there several ways to configure '593 DMA system, I chose the one | |
29 | that seemed commensurate with the highest system performance in the face | |
30 | of moderate interrupt latency: Both DMA channels are configured as | |
31 | recirculating ring buffers, with one channel (#0) dedicated to Rx and | |
32 | the other channel (#1) to Tx and configuration. (Note that this is | |
33 | different than the Crynwr driver, where the Tx DMA channel is initialized | |
34 | before each operation. That approach simplifies operation and Tx error | |
35 | recovery, but requires additional I/O in normal operation and precludes | |
36 | transmit buffer chaining.) | |
37 | ||
38 | Both rings are set to 8192 bytes using {TX,RX}_RING_SIZE. This provides | |
39 | a reasonable ring size for Rx, while simplifying DMA buffer allocation -- | |
40 | DMA buffers must not cross a 128K boundary. (In truth the size selection | |
41 | was influenced by my lack of '593 documentation. I thus was constrained | |
42 | to use the Crynwr '593 initialization table, which sets the Rx ring size | |
43 | to 8K.) | |
44 | ||
45 | Despite my usual low opinion about Intel-designed parts, I must admit | |
46 | that the bulk data handling of the i82593 is a good design for | |
47 | an integrated system, like a laptop, where using two slave DMA channels | |
48 | doesn't pose a problem. I still take issue with using only a single I/O | |
49 | port. In the same controlled environment there are essentially no | |
50 | limitations on I/O space, and using multiple locations would eliminate | |
51 | the need for multiple operations when looking at status registers, | |
52 | setting the Rx ring boundary, or switching to promiscuous mode. | |
53 | ||
54 | I also question Zenith's selection of the '593: one of the advertised | |
55 | advantages of earlier Intel parts was that if you figured out the magic | |
56 | initialization incantation you could use the same part on many different | |
57 | network types. Zenith's use of the "FriendlyNet" (sic) connector rather | |
58 | than an on-board transceiver leads me to believe that they were planning | |
59 | to take advantage of this. But, uhmmm, the '593 omits all but ethernet | |
60 | functionality from the serial subsystem. | |
61 | */ | |
62 | ||
63 | /* 10/2002 | |
64 | ||
65 | o Resurected for Linux 2.5+ by Marc Zyngier <maz@wild-wind.fr.eu.org> : | |
66 | ||
67 | - Removed strange DMA snooping in znet_sent_packet, which lead to | |
68 | TX buffer corruption on my laptop. | |
69 | - Use init_etherdev stuff. | |
70 | - Use kmalloc-ed DMA buffers. | |
71 | - Use as few global variables as possible. | |
72 | - Use proper resources management. | |
73 | - Use wireless/i82593.h as much as possible (structure, constants) | |
74 | - Compiles as module or build-in. | |
75 | - Now survives unplugging/replugging cable. | |
76 | ||
77 | Some code was taken from wavelan_cs. | |
6aa20a22 | 78 | |
1da177e4 LT |
79 | Tested on a vintage Zenith Z-Note 433Lnp+. Probably broken on |
80 | anything else. Testers (and detailed bug reports) are welcome :-). | |
81 | ||
82 | o TODO : | |
83 | ||
84 | - Properly handle multicast | |
85 | - Understand why some traffic patterns add a 1s latency... | |
86 | */ | |
87 | ||
1da177e4 LT |
88 | #include <linux/module.h> |
89 | #include <linux/kernel.h> | |
90 | #include <linux/string.h> | |
91 | #include <linux/errno.h> | |
92 | #include <linux/interrupt.h> | |
93 | #include <linux/ioport.h> | |
94 | #include <linux/init.h> | |
95 | #include <linux/delay.h> | |
96 | #include <linux/netdevice.h> | |
97 | #include <linux/etherdevice.h> | |
98 | #include <linux/skbuff.h> | |
99 | #include <linux/if_arp.h> | |
100 | #include <linux/bitops.h> | |
101 | ||
102 | #include <asm/system.h> | |
103 | #include <asm/io.h> | |
104 | #include <asm/dma.h> | |
105 | ||
106 | /* This include could be elsewhere, since it is not wireless specific */ | |
107 | #include "wireless/i82593.h" | |
108 | ||
109 | static char version[] __initdata = "znet.c:v1.02 9/23/94 becker@scyld.com\n"; | |
110 | ||
111 | #ifndef ZNET_DEBUG | |
112 | #define ZNET_DEBUG 1 | |
113 | #endif | |
114 | static unsigned int znet_debug = ZNET_DEBUG; | |
115 | module_param (znet_debug, int, 0); | |
116 | MODULE_PARM_DESC (znet_debug, "ZNet debug level"); | |
117 | MODULE_LICENSE("GPL"); | |
118 | ||
119 | /* The DMA modes we need aren't in <dma.h>. */ | |
120 | #define DMA_RX_MODE 0x14 /* Auto init, I/O to mem, ++, demand. */ | |
121 | #define DMA_TX_MODE 0x18 /* Auto init, Mem to I/O, ++, demand. */ | |
122 | #define dma_page_eq(ptr1, ptr2) ((long)(ptr1)>>17 == (long)(ptr2)>>17) | |
123 | #define RX_BUF_SIZE 8192 | |
124 | #define TX_BUF_SIZE 8192 | |
125 | #define DMA_BUF_SIZE (RX_BUF_SIZE + 16) /* 8k + 16 bytes for trailers */ | |
126 | ||
127 | #define TX_TIMEOUT 10 | |
128 | ||
129 | struct znet_private { | |
130 | int rx_dma, tx_dma; | |
131 | struct net_device_stats stats; | |
132 | spinlock_t lock; | |
133 | short sia_base, sia_size, io_size; | |
134 | struct i82593_conf_block i593_init; | |
135 | /* The starting, current, and end pointers for the packet buffers. */ | |
136 | ushort *rx_start, *rx_cur, *rx_end; | |
137 | ushort *tx_start, *tx_cur, *tx_end; | |
138 | ushort tx_buf_len; /* Tx buffer length, in words. */ | |
139 | }; | |
140 | ||
141 | /* Only one can be built-in;-> */ | |
142 | static struct net_device *znet_dev; | |
143 | ||
144 | struct netidblk { | |
145 | char magic[8]; /* The magic number (string) "NETIDBLK" */ | |
146 | unsigned char netid[8]; /* The physical station address */ | |
147 | char nettype, globalopt; | |
148 | char vendor[8]; /* The machine vendor and product name. */ | |
149 | char product[8]; | |
150 | char irq1, irq2; /* Interrupts, only one is currently used. */ | |
151 | char dma1, dma2; | |
152 | short dma_mem_misc[8]; /* DMA buffer locations (unused in Linux). */ | |
153 | short iobase1, iosize1; | |
154 | short iobase2, iosize2; /* Second iobase unused. */ | |
155 | char driver_options; /* Misc. bits */ | |
156 | char pad; | |
157 | }; | |
158 | ||
159 | static int znet_open(struct net_device *dev); | |
160 | static int znet_send_packet(struct sk_buff *skb, struct net_device *dev); | |
161 | static irqreturn_t znet_interrupt(int irq, void *dev_id, struct pt_regs *regs); | |
162 | static void znet_rx(struct net_device *dev); | |
163 | static int znet_close(struct net_device *dev); | |
164 | static struct net_device_stats *net_get_stats(struct net_device *dev); | |
165 | static void hardware_init(struct net_device *dev); | |
166 | static void update_stop_hit(short ioaddr, unsigned short rx_stop_offset); | |
167 | static void znet_tx_timeout (struct net_device *dev); | |
168 | ||
169 | /* Request needed resources */ | |
170 | static int znet_request_resources (struct net_device *dev) | |
171 | { | |
172 | struct znet_private *znet = dev->priv; | |
173 | unsigned long flags; | |
6aa20a22 | 174 | |
1da177e4 LT |
175 | if (request_irq (dev->irq, &znet_interrupt, 0, "ZNet", dev)) |
176 | goto failed; | |
177 | if (request_dma (znet->rx_dma, "ZNet rx")) | |
178 | goto free_irq; | |
179 | if (request_dma (znet->tx_dma, "ZNet tx")) | |
180 | goto free_rx_dma; | |
181 | if (!request_region (znet->sia_base, znet->sia_size, "ZNet SIA")) | |
182 | goto free_tx_dma; | |
183 | if (!request_region (dev->base_addr, znet->io_size, "ZNet I/O")) | |
184 | goto free_sia; | |
185 | ||
186 | return 0; /* Happy ! */ | |
187 | ||
188 | free_sia: | |
189 | release_region (znet->sia_base, znet->sia_size); | |
190 | free_tx_dma: | |
191 | flags = claim_dma_lock(); | |
192 | free_dma (znet->tx_dma); | |
193 | release_dma_lock (flags); | |
194 | free_rx_dma: | |
195 | flags = claim_dma_lock(); | |
196 | free_dma (znet->rx_dma); | |
197 | release_dma_lock (flags); | |
198 | free_irq: | |
199 | free_irq (dev->irq, dev); | |
200 | failed: | |
201 | return -1; | |
202 | } | |
203 | ||
204 | static void znet_release_resources (struct net_device *dev) | |
205 | { | |
206 | struct znet_private *znet = dev->priv; | |
207 | unsigned long flags; | |
6aa20a22 | 208 | |
1da177e4 LT |
209 | release_region (znet->sia_base, znet->sia_size); |
210 | release_region (dev->base_addr, znet->io_size); | |
211 | flags = claim_dma_lock(); | |
212 | free_dma (znet->tx_dma); | |
213 | free_dma (znet->rx_dma); | |
214 | release_dma_lock (flags); | |
215 | free_irq (dev->irq, dev); | |
216 | } | |
217 | ||
218 | /* Keep the magical SIA stuff in a single function... */ | |
219 | static void znet_transceiver_power (struct net_device *dev, int on) | |
220 | { | |
221 | struct znet_private *znet = dev->priv; | |
222 | unsigned char v; | |
223 | ||
224 | /* Turn on/off the 82501 SIA, using zenith-specific magic. */ | |
225 | /* Select LAN control register */ | |
226 | outb(0x10, znet->sia_base); | |
227 | ||
228 | if (on) | |
229 | v = inb(znet->sia_base + 1) | 0x84; | |
230 | else | |
231 | v = inb(znet->sia_base + 1) & ~0x84; | |
6aa20a22 | 232 | |
1da177e4 LT |
233 | outb(v, znet->sia_base+1); /* Turn on/off LAN power (bit 2). */ |
234 | } | |
235 | ||
236 | /* Init the i82593, with current promisc/mcast configuration. | |
237 | Also used from hardware_init. */ | |
238 | static void znet_set_multicast_list (struct net_device *dev) | |
239 | { | |
240 | struct znet_private *znet = dev->priv; | |
241 | short ioaddr = dev->base_addr; | |
242 | struct i82593_conf_block *cfblk = &znet->i593_init; | |
243 | ||
244 | memset(cfblk, 0x00, sizeof(struct i82593_conf_block)); | |
6aa20a22 | 245 | |
1da177e4 LT |
246 | /* The configuration block. What an undocumented nightmare. |
247 | The first set of values are those suggested (without explanation) | |
248 | for ethernet in the Intel 82586 databook. The rest appear to be | |
249 | completely undocumented, except for cryptic notes in the Crynwr | |
250 | packet driver. This driver uses the Crynwr values verbatim. */ | |
251 | ||
252 | /* maz : Rewritten to take advantage of the wanvelan includes. | |
253 | At least we have names, not just blind values */ | |
6aa20a22 | 254 | |
1da177e4 LT |
255 | /* Byte 0 */ |
256 | cfblk->fifo_limit = 10; /* = 16 B rx and 80 B tx fifo thresholds */ | |
257 | cfblk->forgnesi = 0; /* 0=82C501, 1=AMD7992B compatibility */ | |
258 | cfblk->fifo_32 = 1; | |
259 | cfblk->d6mod = 0; /* Run in i82593 advanced mode */ | |
260 | cfblk->throttle_enb = 1; | |
261 | ||
262 | /* Byte 1 */ | |
263 | cfblk->throttle = 8; /* Continuous w/interrupts, 128-clock DMA. */ | |
264 | cfblk->cntrxint = 0; /* enable continuous mode receive interrupts */ | |
265 | cfblk->contin = 1; /* enable continuous mode */ | |
266 | ||
267 | /* Byte 2 */ | |
268 | cfblk->addr_len = ETH_ALEN; | |
269 | cfblk->acloc = 1; /* Disable source addr insertion by i82593 */ | |
270 | cfblk->preamb_len = 2; /* 8 bytes preamble */ | |
271 | cfblk->loopback = 0; /* Loopback off */ | |
6aa20a22 | 272 | |
1da177e4 LT |
273 | /* Byte 3 */ |
274 | cfblk->lin_prio = 0; /* Default priorities & backoff methods. */ | |
275 | cfblk->tbofstop = 0; | |
276 | cfblk->exp_prio = 0; | |
277 | cfblk->bof_met = 0; | |
6aa20a22 | 278 | |
1da177e4 LT |
279 | /* Byte 4 */ |
280 | cfblk->ifrm_spc = 6; /* 96 bit times interframe spacing */ | |
6aa20a22 | 281 | |
1da177e4 LT |
282 | /* Byte 5 */ |
283 | cfblk->slottim_low = 0; /* 512 bit times slot time (low) */ | |
6aa20a22 | 284 | |
1da177e4 LT |
285 | /* Byte 6 */ |
286 | cfblk->slottim_hi = 2; /* 512 bit times slot time (high) */ | |
287 | cfblk->max_retr = 15; /* 15 collisions retries */ | |
6aa20a22 | 288 | |
1da177e4 LT |
289 | /* Byte 7 */ |
290 | cfblk->prmisc = ((dev->flags & IFF_PROMISC) ? 1 : 0); /* Promiscuous mode */ | |
291 | cfblk->bc_dis = 0; /* Enable broadcast reception */ | |
292 | cfblk->crs_1 = 0; /* Don't transmit without carrier sense */ | |
293 | cfblk->nocrc_ins = 0; /* i82593 generates CRC */ | |
294 | cfblk->crc_1632 = 0; /* 32-bit Autodin-II CRC */ | |
295 | cfblk->crs_cdt = 0; /* CD not to be interpreted as CS */ | |
6aa20a22 | 296 | |
1da177e4 LT |
297 | /* Byte 8 */ |
298 | cfblk->cs_filter = 0; /* CS is recognized immediately */ | |
299 | cfblk->crs_src = 0; /* External carrier sense */ | |
300 | cfblk->cd_filter = 0; /* CD is recognized immediately */ | |
6aa20a22 | 301 | |
1da177e4 LT |
302 | /* Byte 9 */ |
303 | cfblk->min_fr_len = ETH_ZLEN >> 2; /* Minimum frame length */ | |
6aa20a22 | 304 | |
1da177e4 LT |
305 | /* Byte A */ |
306 | cfblk->lng_typ = 1; /* Type/length checks OFF */ | |
307 | cfblk->lng_fld = 1; /* Disable 802.3 length field check */ | |
308 | cfblk->rxcrc_xf = 1; /* Don't transfer CRC to memory */ | |
309 | cfblk->artx = 1; /* Disable automatic retransmission */ | |
310 | cfblk->sarec = 1; /* Disable source addr trig of CD */ | |
311 | cfblk->tx_jabber = 0; /* Disable jabber jam sequence */ | |
312 | cfblk->hash_1 = 1; /* Use bits 0-5 in mc address hash */ | |
313 | cfblk->lbpkpol = 0; /* Loopback pin active high */ | |
6aa20a22 | 314 | |
1da177e4 LT |
315 | /* Byte B */ |
316 | cfblk->fdx = 0; /* Disable full duplex operation */ | |
6aa20a22 | 317 | |
1da177e4 LT |
318 | /* Byte C */ |
319 | cfblk->dummy_6 = 0x3f; /* all ones, Default multicast addresses & backoff. */ | |
320 | cfblk->mult_ia = 0; /* No multiple individual addresses */ | |
321 | cfblk->dis_bof = 0; /* Disable the backoff algorithm ?! */ | |
6aa20a22 | 322 | |
1da177e4 LT |
323 | /* Byte D */ |
324 | cfblk->dummy_1 = 1; /* set to 1 */ | |
325 | cfblk->tx_ifs_retrig = 3; /* Hmm... Disabled */ | |
326 | cfblk->mc_all = (dev->mc_list || (dev->flags&IFF_ALLMULTI));/* multicast all mode */ | |
327 | cfblk->rcv_mon = 0; /* Monitor mode disabled */ | |
328 | cfblk->frag_acpt = 0; /* Do not accept fragments */ | |
329 | cfblk->tstrttrs = 0; /* No start transmission threshold */ | |
6aa20a22 | 330 | |
1da177e4 LT |
331 | /* Byte E */ |
332 | cfblk->fretx = 1; /* FIFO automatic retransmission */ | |
333 | cfblk->runt_eop = 0; /* drop "runt" packets */ | |
334 | cfblk->hw_sw_pin = 0; /* ?? */ | |
335 | cfblk->big_endn = 0; /* Big Endian ? no... */ | |
336 | cfblk->syncrqs = 1; /* Synchronous DRQ deassertion... */ | |
337 | cfblk->sttlen = 1; /* 6 byte status registers */ | |
338 | cfblk->rx_eop = 0; /* Signal EOP on packet reception */ | |
339 | cfblk->tx_eop = 0; /* Signal EOP on packet transmission */ | |
340 | ||
341 | /* Byte F */ | |
342 | cfblk->rbuf_size = RX_BUF_SIZE >> 12; /* Set receive buffer size */ | |
343 | cfblk->rcvstop = 1; /* Enable Receive Stop Register */ | |
344 | ||
345 | if (znet_debug > 2) { | |
346 | int i; | |
347 | unsigned char *c; | |
348 | ||
349 | for (i = 0, c = (char *) cfblk; i < sizeof (*cfblk); i++) | |
350 | printk ("%02X ", c[i]); | |
351 | printk ("\n"); | |
352 | } | |
6aa20a22 | 353 | |
1da177e4 LT |
354 | *znet->tx_cur++ = sizeof(struct i82593_conf_block); |
355 | memcpy(znet->tx_cur, cfblk, sizeof(struct i82593_conf_block)); | |
356 | znet->tx_cur += sizeof(struct i82593_conf_block)/2; | |
357 | outb(OP0_CONFIGURE | CR0_CHNL, ioaddr); | |
358 | ||
359 | /* XXX FIXME maz : Add multicast addresses here, so having a | |
360 | * multicast address configured isn't equal to IFF_ALLMULTI */ | |
361 | } | |
6aa20a22 | 362 | |
1da177e4 LT |
363 | /* The Z-Note probe is pretty easy. The NETIDBLK exists in the safe-to-probe |
364 | BIOS area. We just scan for the signature, and pull the vital parameters | |
365 | out of the structure. */ | |
366 | ||
367 | static int __init znet_probe (void) | |
368 | { | |
369 | int i; | |
370 | struct netidblk *netinfo; | |
371 | struct znet_private *znet; | |
372 | struct net_device *dev; | |
373 | char *p; | |
374 | int err = -ENOMEM; | |
375 | ||
376 | /* This code scans the region 0xf0000 to 0xfffff for a "NETIDBLK". */ | |
377 | for(p = (char *)phys_to_virt(0xf0000); p < (char *)phys_to_virt(0x100000); p++) | |
378 | if (*p == 'N' && strncmp(p, "NETIDBLK", 8) == 0) | |
379 | break; | |
380 | ||
381 | if (p >= (char *)phys_to_virt(0x100000)) { | |
382 | if (znet_debug > 1) | |
383 | printk(KERN_INFO "No Z-Note ethernet adaptor found.\n"); | |
384 | return -ENODEV; | |
385 | } | |
386 | ||
387 | dev = alloc_etherdev(sizeof(struct znet_private)); | |
388 | if (!dev) | |
389 | return -ENOMEM; | |
390 | ||
391 | SET_MODULE_OWNER (dev); | |
392 | ||
393 | znet = dev->priv; | |
394 | ||
395 | netinfo = (struct netidblk *)p; | |
396 | dev->base_addr = netinfo->iobase1; | |
397 | dev->irq = netinfo->irq1; | |
398 | ||
399 | printk(KERN_INFO "%s: ZNET at %#3lx,", dev->name, dev->base_addr); | |
400 | ||
401 | /* The station address is in the "netidblk" at 0x0f0000. */ | |
402 | for (i = 0; i < 6; i++) | |
403 | printk(" %2.2x", dev->dev_addr[i] = netinfo->netid[i]); | |
404 | ||
405 | printk(", using IRQ %d DMA %d and %d.\n", dev->irq, netinfo->dma1, | |
406 | netinfo->dma2); | |
407 | ||
408 | if (znet_debug > 1) { | |
409 | printk(KERN_INFO "%s: vendor '%16.16s' IRQ1 %d IRQ2 %d DMA1 %d DMA2 %d.\n", | |
410 | dev->name, netinfo->vendor, | |
411 | netinfo->irq1, netinfo->irq2, | |
412 | netinfo->dma1, netinfo->dma2); | |
413 | printk(KERN_INFO "%s: iobase1 %#x size %d iobase2 %#x size %d net type %2.2x.\n", | |
414 | dev->name, netinfo->iobase1, netinfo->iosize1, | |
415 | netinfo->iobase2, netinfo->iosize2, netinfo->nettype); | |
416 | } | |
417 | ||
418 | if (znet_debug > 0) | |
419 | printk(KERN_INFO "%s", version); | |
420 | ||
421 | znet->rx_dma = netinfo->dma1; | |
422 | znet->tx_dma = netinfo->dma2; | |
423 | spin_lock_init(&znet->lock); | |
424 | znet->sia_base = 0xe6; /* Magic address for the 82501 SIA */ | |
425 | znet->sia_size = 2; | |
426 | /* maz: Despite the '593 being advertised above as using a | |
427 | * single 8bits I/O port, this driver does many 16bits | |
428 | * access. So set io_size accordingly */ | |
429 | znet->io_size = 2; | |
430 | ||
431 | if (!(znet->rx_start = kmalloc (DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA))) | |
432 | goto free_dev; | |
433 | if (!(znet->tx_start = kmalloc (DMA_BUF_SIZE, GFP_KERNEL | GFP_DMA))) | |
434 | goto free_rx; | |
435 | ||
436 | if (!dma_page_eq (znet->rx_start, znet->rx_start + (RX_BUF_SIZE/2-1)) || | |
437 | !dma_page_eq (znet->tx_start, znet->tx_start + (TX_BUF_SIZE/2-1))) { | |
438 | printk (KERN_WARNING "tx/rx crossing DMA frontiers, giving up\n"); | |
439 | goto free_tx; | |
440 | } | |
6aa20a22 | 441 | |
1da177e4 LT |
442 | znet->rx_end = znet->rx_start + RX_BUF_SIZE/2; |
443 | znet->tx_buf_len = TX_BUF_SIZE/2; | |
444 | znet->tx_end = znet->tx_start + znet->tx_buf_len; | |
445 | ||
446 | /* The ZNET-specific entries in the device structure. */ | |
447 | dev->open = &znet_open; | |
448 | dev->hard_start_xmit = &znet_send_packet; | |
449 | dev->stop = &znet_close; | |
450 | dev->get_stats = net_get_stats; | |
451 | dev->set_multicast_list = &znet_set_multicast_list; | |
452 | dev->tx_timeout = znet_tx_timeout; | |
453 | dev->watchdog_timeo = TX_TIMEOUT; | |
454 | err = register_netdev(dev); | |
455 | if (err) | |
456 | goto free_tx; | |
457 | znet_dev = dev; | |
458 | return 0; | |
459 | ||
460 | free_tx: | |
461 | kfree(znet->tx_start); | |
462 | free_rx: | |
463 | kfree(znet->rx_start); | |
464 | free_dev: | |
465 | free_netdev(dev); | |
466 | return err; | |
467 | } | |
468 | ||
6aa20a22 | 469 | |
1da177e4 LT |
470 | static int znet_open(struct net_device *dev) |
471 | { | |
472 | int ioaddr = dev->base_addr; | |
473 | ||
474 | if (znet_debug > 2) | |
475 | printk(KERN_DEBUG "%s: znet_open() called.\n", dev->name); | |
476 | ||
477 | /* These should never fail. You can't add devices to a sealed box! */ | |
478 | if (znet_request_resources (dev)) { | |
479 | printk(KERN_WARNING "%s: Not opened -- resource busy?!?\n", dev->name); | |
480 | return -EBUSY; | |
481 | } | |
482 | ||
483 | znet_transceiver_power (dev, 1); | |
6aa20a22 | 484 | |
1da177e4 LT |
485 | /* According to the Crynwr driver we should wait 50 msec. for the |
486 | LAN clock to stabilize. My experiments indicates that the '593 can | |
487 | be initialized immediately. The delay is probably needed for the | |
488 | DC-to-DC converter to come up to full voltage, and for the oscillator | |
489 | to be spot-on at 20Mhz before transmitting. | |
490 | Until this proves to be a problem we rely on the higher layers for the | |
491 | delay and save allocating a timer entry. */ | |
492 | ||
493 | /* maz : Well, I'm getting every time the following message | |
494 | * without the delay on a 486@33. This machine is much too | |
495 | * fast... :-) So maybe the Crynwr driver wasn't wrong after | |
496 | * all, even if the message is completly harmless on my | |
497 | * setup. */ | |
498 | mdelay (50); | |
6aa20a22 | 499 | |
1da177e4 LT |
500 | /* This follows the packet driver's lead, and checks for success. */ |
501 | if (inb(ioaddr) != 0x10 && inb(ioaddr) != 0x00) | |
502 | printk(KERN_WARNING "%s: Problem turning on the transceiver power.\n", | |
503 | dev->name); | |
504 | ||
505 | hardware_init(dev); | |
506 | netif_start_queue (dev); | |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
511 | ||
512 | static void znet_tx_timeout (struct net_device *dev) | |
513 | { | |
514 | int ioaddr = dev->base_addr; | |
515 | ushort event, tx_status, rx_offset, state; | |
516 | ||
517 | outb (CR0_STATUS_0, ioaddr); | |
518 | event = inb (ioaddr); | |
519 | outb (CR0_STATUS_1, ioaddr); | |
520 | tx_status = inw (ioaddr); | |
521 | outb (CR0_STATUS_2, ioaddr); | |
522 | rx_offset = inw (ioaddr); | |
523 | outb (CR0_STATUS_3, ioaddr); | |
524 | state = inb (ioaddr); | |
525 | printk (KERN_WARNING "%s: transmit timed out, status %02x %04x %04x %02x," | |
526 | " resetting.\n", dev->name, event, tx_status, rx_offset, state); | |
527 | if (tx_status == TX_LOST_CRS) | |
528 | printk (KERN_WARNING "%s: Tx carrier error, check transceiver cable.\n", | |
529 | dev->name); | |
530 | outb (OP0_RESET, ioaddr); | |
531 | hardware_init (dev); | |
532 | netif_wake_queue (dev); | |
533 | } | |
534 | ||
535 | static int znet_send_packet(struct sk_buff *skb, struct net_device *dev) | |
536 | { | |
537 | int ioaddr = dev->base_addr; | |
538 | struct znet_private *znet = dev->priv; | |
539 | unsigned long flags; | |
540 | short length = skb->len; | |
541 | ||
542 | if (znet_debug > 4) | |
543 | printk(KERN_DEBUG "%s: ZNet_send_packet.\n", dev->name); | |
544 | ||
545 | if (length < ETH_ZLEN) { | |
5b057c6b | 546 | if (skb_padto(skb, ETH_ZLEN)) |
1da177e4 LT |
547 | return 0; |
548 | length = ETH_ZLEN; | |
549 | } | |
6aa20a22 | 550 | |
1da177e4 | 551 | netif_stop_queue (dev); |
6aa20a22 | 552 | |
1da177e4 LT |
553 | /* Check that the part hasn't reset itself, probably from suspend. */ |
554 | outb(CR0_STATUS_0, ioaddr); | |
555 | if (inw(ioaddr) == 0x0010 && | |
556 | inw(ioaddr) == 0x0000 && | |
557 | inw(ioaddr) == 0x0010) { | |
558 | if (znet_debug > 1) | |
559 | printk (KERN_WARNING "%s : waking up\n", dev->name); | |
560 | hardware_init(dev); | |
561 | znet_transceiver_power (dev, 1); | |
562 | } | |
563 | ||
564 | if (1) { | |
565 | unsigned char *buf = (void *)skb->data; | |
566 | ushort *tx_link = znet->tx_cur - 1; | |
567 | ushort rnd_len = (length + 1)>>1; | |
6aa20a22 | 568 | |
1da177e4 LT |
569 | znet->stats.tx_bytes+=length; |
570 | ||
571 | if (znet->tx_cur >= znet->tx_end) | |
572 | znet->tx_cur = znet->tx_start; | |
573 | *znet->tx_cur++ = length; | |
574 | if (znet->tx_cur + rnd_len + 1 > znet->tx_end) { | |
575 | int semi_cnt = (znet->tx_end - znet->tx_cur)<<1; /* Cvrt to byte cnt. */ | |
576 | memcpy(znet->tx_cur, buf, semi_cnt); | |
577 | rnd_len -= semi_cnt>>1; | |
578 | memcpy(znet->tx_start, buf + semi_cnt, length - semi_cnt); | |
579 | znet->tx_cur = znet->tx_start + rnd_len; | |
580 | } else { | |
581 | memcpy(znet->tx_cur, buf, skb->len); | |
582 | znet->tx_cur += rnd_len; | |
583 | } | |
584 | *znet->tx_cur++ = 0; | |
585 | ||
586 | spin_lock_irqsave(&znet->lock, flags); | |
587 | { | |
588 | *tx_link = OP0_TRANSMIT | CR0_CHNL; | |
589 | /* Is this always safe to do? */ | |
590 | outb(OP0_TRANSMIT | CR0_CHNL, ioaddr); | |
591 | } | |
592 | spin_unlock_irqrestore (&znet->lock, flags); | |
593 | ||
594 | dev->trans_start = jiffies; | |
595 | netif_start_queue (dev); | |
596 | ||
597 | if (znet_debug > 4) | |
598 | printk(KERN_DEBUG "%s: Transmitter queued, length %d.\n", dev->name, length); | |
599 | } | |
6aa20a22 | 600 | dev_kfree_skb(skb); |
1da177e4 LT |
601 | return 0; |
602 | } | |
603 | ||
604 | /* The ZNET interrupt handler. */ | |
605 | static irqreturn_t znet_interrupt(int irq, void *dev_id, struct pt_regs * regs) | |
606 | { | |
607 | struct net_device *dev = dev_id; | |
608 | struct znet_private *znet = dev->priv; | |
609 | int ioaddr; | |
610 | int boguscnt = 20; | |
611 | int handled = 0; | |
612 | ||
613 | if (dev == NULL) { | |
614 | printk(KERN_WARNING "znet_interrupt(): IRQ %d for unknown device.\n", irq); | |
615 | return IRQ_NONE; | |
616 | } | |
617 | ||
618 | spin_lock (&znet->lock); | |
6aa20a22 | 619 | |
1da177e4 LT |
620 | ioaddr = dev->base_addr; |
621 | ||
622 | outb(CR0_STATUS_0, ioaddr); | |
623 | do { | |
624 | ushort status = inb(ioaddr); | |
625 | if (znet_debug > 5) { | |
626 | ushort result, rx_ptr, running; | |
627 | outb(CR0_STATUS_1, ioaddr); | |
628 | result = inw(ioaddr); | |
629 | outb(CR0_STATUS_2, ioaddr); | |
630 | rx_ptr = inw(ioaddr); | |
631 | outb(CR0_STATUS_3, ioaddr); | |
632 | running = inb(ioaddr); | |
633 | printk(KERN_DEBUG "%s: interrupt, status %02x, %04x %04x %02x serial %d.\n", | |
634 | dev->name, status, result, rx_ptr, running, boguscnt); | |
635 | } | |
636 | if ((status & SR0_INTERRUPT) == 0) | |
637 | break; | |
638 | ||
639 | handled = 1; | |
640 | ||
641 | if ((status & SR0_EVENT_MASK) == SR0_TRANSMIT_DONE || | |
642 | (status & SR0_EVENT_MASK) == SR0_RETRANSMIT_DONE || | |
643 | (status & SR0_EVENT_MASK) == SR0_TRANSMIT_NO_CRC_DONE) { | |
644 | int tx_status; | |
645 | outb(CR0_STATUS_1, ioaddr); | |
646 | tx_status = inw(ioaddr); | |
647 | /* It's undocumented, but tx_status seems to match the i82586. */ | |
648 | if (tx_status & TX_OK) { | |
649 | znet->stats.tx_packets++; | |
650 | znet->stats.collisions += tx_status & TX_NCOL_MASK; | |
651 | } else { | |
652 | if (tx_status & (TX_LOST_CTS | TX_LOST_CRS)) | |
653 | znet->stats.tx_carrier_errors++; | |
654 | if (tx_status & TX_UND_RUN) | |
655 | znet->stats.tx_fifo_errors++; | |
656 | if (!(tx_status & TX_HRT_BEAT)) | |
657 | znet->stats.tx_heartbeat_errors++; | |
658 | if (tx_status & TX_MAX_COL) | |
659 | znet->stats.tx_aborted_errors++; | |
660 | /* ...and the catch-all. */ | |
661 | if ((tx_status | (TX_LOST_CRS | TX_LOST_CTS | TX_UND_RUN | TX_HRT_BEAT | TX_MAX_COL)) != (TX_LOST_CRS | TX_LOST_CTS | TX_UND_RUN | TX_HRT_BEAT | TX_MAX_COL)) | |
662 | znet->stats.tx_errors++; | |
663 | ||
664 | /* Transceiver may be stuck if cable | |
665 | * was removed while emiting a | |
666 | * packet. Flip it off, then on to | |
667 | * reset it. This is very empirical, | |
668 | * but it seems to work. */ | |
6aa20a22 | 669 | |
1da177e4 LT |
670 | znet_transceiver_power (dev, 0); |
671 | znet_transceiver_power (dev, 1); | |
672 | } | |
673 | netif_wake_queue (dev); | |
674 | } | |
675 | ||
676 | if ((status & SR0_RECEPTION) || | |
677 | (status & SR0_EVENT_MASK) == SR0_STOP_REG_HIT) { | |
678 | znet_rx(dev); | |
679 | } | |
680 | /* Clear the interrupts we've handled. */ | |
681 | outb(CR0_INT_ACK, ioaddr); | |
682 | } while (boguscnt--); | |
683 | ||
684 | spin_unlock (&znet->lock); | |
6aa20a22 | 685 | |
1da177e4 LT |
686 | return IRQ_RETVAL(handled); |
687 | } | |
688 | ||
689 | static void znet_rx(struct net_device *dev) | |
690 | { | |
691 | struct znet_private *znet = dev->priv; | |
692 | int ioaddr = dev->base_addr; | |
693 | int boguscount = 1; | |
694 | short next_frame_end_offset = 0; /* Offset of next frame start. */ | |
695 | short *cur_frame_end; | |
696 | short cur_frame_end_offset; | |
697 | ||
698 | outb(CR0_STATUS_2, ioaddr); | |
699 | cur_frame_end_offset = inw(ioaddr); | |
700 | ||
701 | if (cur_frame_end_offset == znet->rx_cur - znet->rx_start) { | |
702 | printk(KERN_WARNING "%s: Interrupted, but nothing to receive, offset %03x.\n", | |
703 | dev->name, cur_frame_end_offset); | |
704 | return; | |
705 | } | |
706 | ||
707 | /* Use same method as the Crynwr driver: construct a forward list in | |
708 | the same area of the backwards links we now have. This allows us to | |
709 | pass packets to the upper layers in the order they were received -- | |
710 | important for fast-path sequential operations. */ | |
711 | while (znet->rx_start + cur_frame_end_offset != znet->rx_cur | |
712 | && ++boguscount < 5) { | |
713 | unsigned short hi_cnt, lo_cnt, hi_status, lo_status; | |
714 | int count, status; | |
715 | ||
716 | if (cur_frame_end_offset < 4) { | |
717 | /* Oh no, we have a special case: the frame trailer wraps around | |
718 | the end of the ring buffer. We've saved space at the end of | |
719 | the ring buffer for just this problem. */ | |
720 | memcpy(znet->rx_end, znet->rx_start, 8); | |
721 | cur_frame_end_offset += (RX_BUF_SIZE/2); | |
722 | } | |
723 | cur_frame_end = znet->rx_start + cur_frame_end_offset - 4; | |
724 | ||
725 | lo_status = *cur_frame_end++; | |
726 | hi_status = *cur_frame_end++; | |
727 | status = ((hi_status & 0xff) << 8) + (lo_status & 0xff); | |
728 | lo_cnt = *cur_frame_end++; | |
729 | hi_cnt = *cur_frame_end++; | |
730 | count = ((hi_cnt & 0xff) << 8) + (lo_cnt & 0xff); | |
731 | ||
732 | if (znet_debug > 5) | |
733 | printk(KERN_DEBUG "Constructing trailer at location %03x, %04x %04x %04x %04x" | |
734 | " count %#x status %04x.\n", | |
735 | cur_frame_end_offset<<1, lo_status, hi_status, lo_cnt, hi_cnt, | |
736 | count, status); | |
737 | cur_frame_end[-4] = status; | |
738 | cur_frame_end[-3] = next_frame_end_offset; | |
739 | cur_frame_end[-2] = count; | |
740 | next_frame_end_offset = cur_frame_end_offset; | |
741 | cur_frame_end_offset -= ((count + 1)>>1) + 3; | |
742 | if (cur_frame_end_offset < 0) | |
743 | cur_frame_end_offset += RX_BUF_SIZE/2; | |
744 | }; | |
745 | ||
746 | /* Now step forward through the list. */ | |
747 | do { | |
748 | ushort *this_rfp_ptr = znet->rx_start + next_frame_end_offset; | |
749 | int status = this_rfp_ptr[-4]; | |
750 | int pkt_len = this_rfp_ptr[-2]; | |
6aa20a22 | 751 | |
1da177e4 LT |
752 | if (znet_debug > 5) |
753 | printk(KERN_DEBUG "Looking at trailer ending at %04x status %04x length %03x" | |
754 | " next %04x.\n", next_frame_end_offset<<1, status, pkt_len, | |
755 | this_rfp_ptr[-3]<<1); | |
756 | /* Once again we must assume that the i82586 docs apply. */ | |
757 | if ( ! (status & RX_RCV_OK)) { /* There was an error. */ | |
758 | znet->stats.rx_errors++; | |
759 | if (status & RX_CRC_ERR) znet->stats.rx_crc_errors++; | |
760 | if (status & RX_ALG_ERR) znet->stats.rx_frame_errors++; | |
761 | #if 0 | |
762 | if (status & 0x0200) znet->stats.rx_over_errors++; /* Wrong. */ | |
763 | if (status & 0x0100) znet->stats.rx_fifo_errors++; | |
764 | #else | |
765 | /* maz : Wild guess... */ | |
766 | if (status & RX_OVRRUN) znet->stats.rx_over_errors++; | |
767 | #endif | |
768 | if (status & RX_SRT_FRM) znet->stats.rx_length_errors++; | |
769 | } else if (pkt_len > 1536) { | |
770 | znet->stats.rx_length_errors++; | |
771 | } else { | |
772 | /* Malloc up new buffer. */ | |
773 | struct sk_buff *skb; | |
774 | ||
775 | skb = dev_alloc_skb(pkt_len); | |
776 | if (skb == NULL) { | |
777 | if (znet_debug) | |
778 | printk(KERN_WARNING "%s: Memory squeeze, dropping packet.\n", dev->name); | |
779 | znet->stats.rx_dropped++; | |
780 | break; | |
781 | } | |
782 | skb->dev = dev; | |
783 | ||
784 | if (&znet->rx_cur[(pkt_len+1)>>1] > znet->rx_end) { | |
785 | int semi_cnt = (znet->rx_end - znet->rx_cur)<<1; | |
786 | memcpy(skb_put(skb,semi_cnt), znet->rx_cur, semi_cnt); | |
787 | memcpy(skb_put(skb,pkt_len-semi_cnt), znet->rx_start, | |
788 | pkt_len - semi_cnt); | |
789 | } else { | |
790 | memcpy(skb_put(skb,pkt_len), znet->rx_cur, pkt_len); | |
791 | if (znet_debug > 6) { | |
792 | unsigned int *packet = (unsigned int *) skb->data; | |
793 | printk(KERN_DEBUG "Packet data is %08x %08x %08x %08x.\n", packet[0], | |
794 | packet[1], packet[2], packet[3]); | |
795 | } | |
796 | } | |
797 | skb->protocol=eth_type_trans(skb,dev); | |
798 | netif_rx(skb); | |
799 | dev->last_rx = jiffies; | |
800 | znet->stats.rx_packets++; | |
801 | znet->stats.rx_bytes += pkt_len; | |
802 | } | |
803 | znet->rx_cur = this_rfp_ptr; | |
804 | if (znet->rx_cur >= znet->rx_end) | |
805 | znet->rx_cur -= RX_BUF_SIZE/2; | |
806 | update_stop_hit(ioaddr, (znet->rx_cur - znet->rx_start)<<1); | |
807 | next_frame_end_offset = this_rfp_ptr[-3]; | |
808 | if (next_frame_end_offset == 0) /* Read all the frames? */ | |
809 | break; /* Done for now */ | |
810 | this_rfp_ptr = znet->rx_start + next_frame_end_offset; | |
811 | } while (--boguscount); | |
812 | ||
813 | /* If any worth-while packets have been received, dev_rint() | |
814 | has done a mark_bh(INET_BH) for us and will work on them | |
815 | when we get to the bottom-half routine. */ | |
816 | return; | |
817 | } | |
818 | ||
819 | /* The inverse routine to znet_open(). */ | |
820 | static int znet_close(struct net_device *dev) | |
821 | { | |
822 | int ioaddr = dev->base_addr; | |
823 | ||
824 | netif_stop_queue (dev); | |
825 | ||
826 | outb(OP0_RESET, ioaddr); /* CMD0_RESET */ | |
827 | ||
828 | if (znet_debug > 1) | |
829 | printk(KERN_DEBUG "%s: Shutting down ethercard.\n", dev->name); | |
830 | /* Turn off transceiver power. */ | |
831 | znet_transceiver_power (dev, 0); | |
6aa20a22 | 832 | |
1da177e4 | 833 | znet_release_resources (dev); |
6aa20a22 | 834 | |
1da177e4 LT |
835 | return 0; |
836 | } | |
837 | ||
838 | /* Get the current statistics. This may be called with the card open or | |
839 | closed. */ | |
840 | static struct net_device_stats *net_get_stats(struct net_device *dev) | |
841 | { | |
842 | struct znet_private *znet = dev->priv; | |
843 | ||
844 | return &znet->stats; | |
845 | } | |
846 | ||
847 | static void show_dma(struct net_device *dev) | |
848 | { | |
849 | short ioaddr = dev->base_addr; | |
850 | unsigned char stat = inb (ioaddr); | |
851 | struct znet_private *znet = dev->priv; | |
852 | unsigned long flags; | |
853 | short dma_port = ((znet->tx_dma&3)<<2) + IO_DMA2_BASE; | |
854 | unsigned addr = inb(dma_port); | |
855 | short residue; | |
856 | ||
857 | addr |= inb(dma_port) << 8; | |
858 | residue = get_dma_residue(znet->tx_dma); | |
6aa20a22 | 859 | |
1da177e4 LT |
860 | if (znet_debug > 1) { |
861 | flags=claim_dma_lock(); | |
862 | printk(KERN_DEBUG "Stat:%02x Addr: %04x cnt:%3x\n", | |
863 | stat, addr<<1, residue); | |
864 | release_dma_lock(flags); | |
865 | } | |
866 | } | |
867 | ||
868 | /* Initialize the hardware. We have to do this when the board is open()ed | |
869 | or when we come out of suspend mode. */ | |
870 | static void hardware_init(struct net_device *dev) | |
871 | { | |
872 | unsigned long flags; | |
873 | short ioaddr = dev->base_addr; | |
874 | struct znet_private *znet = dev->priv; | |
875 | ||
876 | znet->rx_cur = znet->rx_start; | |
877 | znet->tx_cur = znet->tx_start; | |
878 | ||
879 | /* Reset the chip, and start it up. */ | |
880 | outb(OP0_RESET, ioaddr); | |
881 | ||
882 | flags=claim_dma_lock(); | |
883 | disable_dma(znet->rx_dma); /* reset by an interrupting task. */ | |
884 | clear_dma_ff(znet->rx_dma); | |
885 | set_dma_mode(znet->rx_dma, DMA_RX_MODE); | |
886 | set_dma_addr(znet->rx_dma, (unsigned int) znet->rx_start); | |
887 | set_dma_count(znet->rx_dma, RX_BUF_SIZE); | |
888 | enable_dma(znet->rx_dma); | |
889 | /* Now set up the Tx channel. */ | |
890 | disable_dma(znet->tx_dma); | |
891 | clear_dma_ff(znet->tx_dma); | |
892 | set_dma_mode(znet->tx_dma, DMA_TX_MODE); | |
893 | set_dma_addr(znet->tx_dma, (unsigned int) znet->tx_start); | |
894 | set_dma_count(znet->tx_dma, znet->tx_buf_len<<1); | |
895 | enable_dma(znet->tx_dma); | |
896 | release_dma_lock(flags); | |
6aa20a22 | 897 | |
1da177e4 LT |
898 | if (znet_debug > 1) |
899 | printk(KERN_DEBUG "%s: Initializing the i82593, rx buf %p tx buf %p\n", | |
900 | dev->name, znet->rx_start,znet->tx_start); | |
901 | /* Do an empty configure command, just like the Crynwr driver. This | |
902 | resets to chip to its default values. */ | |
903 | *znet->tx_cur++ = 0; | |
904 | *znet->tx_cur++ = 0; | |
905 | show_dma(dev); | |
906 | outb(OP0_CONFIGURE | CR0_CHNL, ioaddr); | |
907 | ||
908 | znet_set_multicast_list (dev); | |
909 | ||
910 | *znet->tx_cur++ = 6; | |
911 | memcpy(znet->tx_cur, dev->dev_addr, 6); | |
912 | znet->tx_cur += 3; | |
913 | show_dma(dev); | |
914 | outb(OP0_IA_SETUP | CR0_CHNL, ioaddr); | |
915 | show_dma(dev); | |
916 | ||
917 | update_stop_hit(ioaddr, 8192); | |
918 | if (znet_debug > 1) printk(KERN_DEBUG "enabling Rx.\n"); | |
919 | outb(OP0_RCV_ENABLE, ioaddr); | |
920 | netif_start_queue (dev); | |
921 | } | |
922 | ||
923 | static void update_stop_hit(short ioaddr, unsigned short rx_stop_offset) | |
924 | { | |
925 | outb(OP0_SWIT_TO_PORT_1 | CR0_CHNL, ioaddr); | |
926 | if (znet_debug > 5) | |
927 | printk(KERN_DEBUG "Updating stop hit with value %02x.\n", | |
928 | (rx_stop_offset >> 6) | CR1_STOP_REG_UPDATE); | |
929 | outb((rx_stop_offset >> 6) | CR1_STOP_REG_UPDATE, ioaddr); | |
930 | outb(OP1_SWIT_TO_PORT_0, ioaddr); | |
931 | } | |
932 | ||
933 | static __exit void znet_cleanup (void) | |
934 | { | |
935 | if (znet_dev) { | |
936 | struct znet_private *znet = znet_dev->priv; | |
937 | ||
938 | unregister_netdev (znet_dev); | |
939 | kfree (znet->rx_start); | |
940 | kfree (znet->tx_start); | |
941 | free_netdev (znet_dev); | |
942 | } | |
943 | } | |
944 | ||
945 | module_init (znet_probe); | |
946 | module_exit (znet_cleanup); |