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1da177e4 LT |
1 | /* atp.c: Attached (pocket) ethernet adapter driver for linux. */ |
2 | /* | |
3 | This is a driver for commonly OEM pocket (parallel port) | |
4 | ethernet adapters based on the Realtek RTL8002 and RTL8012 chips. | |
5 | ||
6 | Written 1993-2000 by Donald Becker. | |
7 | ||
8 | This software may be used and distributed according to the terms of | |
9 | the GNU General Public License (GPL), incorporated herein by reference. | |
10 | Drivers based on or derived from this code fall under the GPL and must | |
11 | retain the authorship, copyright and license notice. This file is not | |
12 | a complete program and may only be used when the entire operating | |
13 | system is licensed under the GPL. | |
14 | ||
15 | Copyright 1993 United States Government as represented by the Director, | |
16 | National Security Agency. Copyright 1994-2000 retained by the original | |
17 | author, Donald Becker. The timer-based reset code was supplied in 1995 | |
18 | by Bill Carlson, wwc@super.org. | |
19 | ||
20 | The author may be reached as becker@scyld.com, or C/O | |
21 | Scyld Computing Corporation | |
22 | 410 Severn Ave., Suite 210 | |
23 | Annapolis MD 21403 | |
24 | ||
25 | Support information and updates available at | |
26 | http://www.scyld.com/network/atp.html | |
27 | ||
28 | ||
29 | Modular support/softnet added by Alan Cox. | |
30 | _bit abuse fixed up by Alan Cox | |
31 | ||
32 | */ | |
33 | ||
34 | static const char versionA[] = | |
35 | "atp.c:v1.09=ac 2002/10/01 Donald Becker <becker@scyld.com>\n"; | |
36 | static const char versionB[] = | |
37 | " http://www.scyld.com/network/atp.html\n"; | |
38 | ||
39 | /* The user-configurable values. | |
40 | These may be modified when a driver module is loaded.*/ | |
41 | ||
42 | static int debug = 1; /* 1 normal messages, 0 quiet .. 7 verbose. */ | |
43 | #define net_debug debug | |
44 | ||
45 | /* Maximum events (Rx packets, etc.) to handle at each interrupt. */ | |
46 | static int max_interrupt_work = 15; | |
47 | ||
48 | #define NUM_UNITS 2 | |
49 | /* The standard set of ISA module parameters. */ | |
50 | static int io[NUM_UNITS]; | |
51 | static int irq[NUM_UNITS]; | |
52 | static int xcvr[NUM_UNITS]; /* The data transfer mode. */ | |
53 | ||
54 | /* Operational parameters that are set at compile time. */ | |
55 | ||
56 | /* Time in jiffies before concluding the transmitter is hung. */ | |
57 | #define TX_TIMEOUT (400*HZ/1000) | |
58 | ||
59 | /* | |
60 | This file is a device driver for the RealTek (aka AT-Lan-Tec) pocket | |
61 | ethernet adapter. This is a common low-cost OEM pocket ethernet | |
62 | adapter, sold under many names. | |
63 | ||
64 | Sources: | |
65 | This driver was written from the packet driver assembly code provided by | |
66 | Vincent Bono of AT-Lan-Tec. Ever try to figure out how a complicated | |
67 | device works just from the assembly code? It ain't pretty. The following | |
68 | description is written based on guesses and writing lots of special-purpose | |
69 | code to test my theorized operation. | |
70 | ||
71 | In 1997 Realtek made available the documentation for the second generation | |
72 | RTL8012 chip, which has lead to several driver improvements. | |
73 | http://www.realtek.com.tw/cn/cn.html | |
74 | ||
75 | Theory of Operation | |
76 | ||
77 | The RTL8002 adapter seems to be built around a custom spin of the SEEQ | |
78 | controller core. It probably has a 16K or 64K internal packet buffer, of | |
79 | which the first 4K is devoted to transmit and the rest to receive. | |
80 | The controller maintains the queue of received packet and the packet buffer | |
81 | access pointer internally, with only 'reset to beginning' and 'skip to next | |
82 | packet' commands visible. The transmit packet queue holds two (or more?) | |
83 | packets: both 'retransmit this packet' (due to collision) and 'transmit next | |
84 | packet' commands must be started by hand. | |
85 | ||
86 | The station address is stored in a standard bit-serial EEPROM which must be | |
87 | read (ughh) by the device driver. (Provisions have been made for | |
88 | substituting a 74S288 PROM, but I haven't gotten reports of any models | |
89 | using it.) Unlike built-in devices, a pocket adapter can temporarily lose | |
90 | power without indication to the device driver. The major effect is that | |
91 | the station address, receive filter (promiscuous, etc.) and transceiver | |
92 | must be reset. | |
93 | ||
94 | The controller itself has 16 registers, some of which use only the lower | |
95 | bits. The registers are read and written 4 bits at a time. The four bit | |
96 | register address is presented on the data lines along with a few additional | |
97 | timing and control bits. The data is then read from status port or written | |
98 | to the data port. | |
99 | ||
100 | Correction: the controller has two banks of 16 registers. The second | |
101 | bank contains only the multicast filter table (now used) and the EEPROM | |
102 | access registers. | |
103 | ||
104 | Since the bulk data transfer of the actual packets through the slow | |
105 | parallel port dominates the driver's running time, four distinct data | |
106 | (non-register) transfer modes are provided by the adapter, two in each | |
107 | direction. In the first mode timing for the nibble transfers is | |
108 | provided through the data port. In the second mode the same timing is | |
109 | provided through the control port. In either case the data is read from | |
110 | the status port and written to the data port, just as it is accessing | |
111 | registers. | |
112 | ||
113 | In addition to the basic data transfer methods, several more are modes are | |
114 | created by adding some delay by doing multiple reads of the data to allow | |
115 | it to stabilize. This delay seems to be needed on most machines. | |
116 | ||
117 | The data transfer mode is stored in the 'dev->if_port' field. Its default | |
118 | value is '4'. It may be overridden at boot-time using the third parameter | |
119 | to the "ether=..." initialization. | |
120 | ||
121 | The header file <atp.h> provides inline functions that encapsulate the | |
122 | register and data access methods. These functions are hand-tuned to | |
123 | generate reasonable object code. This header file also documents my | |
124 | interpretations of the device registers. | |
125 | */ | |
126 | ||
127 | #include <linux/kernel.h> | |
128 | #include <linux/module.h> | |
129 | #include <linux/types.h> | |
130 | #include <linux/fcntl.h> | |
131 | #include <linux/interrupt.h> | |
132 | #include <linux/ioport.h> | |
133 | #include <linux/in.h> | |
134 | #include <linux/slab.h> | |
135 | #include <linux/string.h> | |
136 | #include <linux/errno.h> | |
137 | #include <linux/init.h> | |
138 | #include <linux/crc32.h> | |
139 | #include <linux/netdevice.h> | |
140 | #include <linux/etherdevice.h> | |
141 | #include <linux/skbuff.h> | |
142 | #include <linux/spinlock.h> | |
143 | #include <linux/delay.h> | |
144 | #include <linux/bitops.h> | |
145 | ||
146 | #include <asm/system.h> | |
147 | #include <asm/io.h> | |
148 | #include <asm/dma.h> | |
149 | ||
150 | #include "atp.h" | |
151 | ||
152 | MODULE_AUTHOR("Donald Becker <becker@scyld.com>"); | |
153 | MODULE_DESCRIPTION("RealTek RTL8002/8012 parallel port Ethernet driver"); | |
154 | MODULE_LICENSE("GPL"); | |
155 | ||
156 | module_param(max_interrupt_work, int, 0); | |
157 | module_param(debug, int, 0); | |
158 | module_param_array(io, int, NULL, 0); | |
159 | module_param_array(irq, int, NULL, 0); | |
160 | module_param_array(xcvr, int, NULL, 0); | |
161 | MODULE_PARM_DESC(max_interrupt_work, "ATP maximum events handled per interrupt"); | |
162 | MODULE_PARM_DESC(debug, "ATP debug level (0-7)"); | |
163 | MODULE_PARM_DESC(io, "ATP I/O base address(es)"); | |
164 | MODULE_PARM_DESC(irq, "ATP IRQ number(s)"); | |
165 | MODULE_PARM_DESC(xcvr, "ATP transceiver(s) (0=internal, 1=external)"); | |
166 | ||
167 | /* The number of low I/O ports used by the ethercard. */ | |
168 | #define ETHERCARD_TOTAL_SIZE 3 | |
169 | ||
170 | /* Sequence to switch an 8012 from printer mux to ethernet mode. */ | |
171 | static char mux_8012[] = { 0xff, 0xf7, 0xff, 0xfb, 0xf3, 0xfb, 0xff, 0xf7,}; | |
172 | ||
173 | struct net_local { | |
174 | spinlock_t lock; | |
175 | struct net_device *next_module; | |
176 | struct net_device_stats stats; | |
177 | struct timer_list timer; /* Media selection timer. */ | |
178 | long last_rx_time; /* Last Rx, in jiffies, to handle Rx hang. */ | |
179 | int saved_tx_size; | |
180 | unsigned int tx_unit_busy:1; | |
181 | unsigned char re_tx, /* Number of packet retransmissions. */ | |
182 | addr_mode, /* Current Rx filter e.g. promiscuous, etc. */ | |
183 | pac_cnt_in_tx_buf, | |
184 | chip_type; | |
185 | }; | |
186 | ||
187 | /* This code, written by wwc@super.org, resets the adapter every | |
188 | TIMED_CHECKER ticks. This recovers from an unknown error which | |
189 | hangs the device. */ | |
190 | #define TIMED_CHECKER (HZ/4) | |
191 | #ifdef TIMED_CHECKER | |
192 | #include <linux/timer.h> | |
193 | static void atp_timed_checker(unsigned long ignored); | |
194 | #endif | |
195 | ||
196 | /* Index to functions, as function prototypes. */ | |
197 | ||
198 | static int atp_probe1(long ioaddr); | |
199 | static void get_node_ID(struct net_device *dev); | |
200 | static unsigned short eeprom_op(long ioaddr, unsigned int cmd); | |
201 | static int net_open(struct net_device *dev); | |
202 | static void hardware_init(struct net_device *dev); | |
203 | static void write_packet(long ioaddr, int length, unsigned char *packet, int pad, int mode); | |
204 | static void trigger_send(long ioaddr, int length); | |
205 | static int atp_send_packet(struct sk_buff *skb, struct net_device *dev); | |
206 | static irqreturn_t atp_interrupt(int irq, void *dev_id, struct pt_regs *regs); | |
207 | static void net_rx(struct net_device *dev); | |
208 | static void read_block(long ioaddr, int length, unsigned char *buffer, int data_mode); | |
209 | static int net_close(struct net_device *dev); | |
210 | static struct net_device_stats *net_get_stats(struct net_device *dev); | |
211 | static void set_rx_mode_8002(struct net_device *dev); | |
212 | static void set_rx_mode_8012(struct net_device *dev); | |
213 | static void tx_timeout(struct net_device *dev); | |
214 | ||
215 | ||
216 | /* A list of all installed ATP devices, for removing the driver module. */ | |
217 | static struct net_device *root_atp_dev; | |
218 | ||
219 | /* Check for a network adapter of this type, and return '0' iff one exists. | |
220 | If dev->base_addr == 0, probe all likely locations. | |
221 | If dev->base_addr == 1, always return failure. | |
222 | If dev->base_addr == 2, allocate space for the device and return success | |
223 | (detachable devices only). | |
6aa20a22 | 224 | |
1da177e4 LT |
225 | FIXME: we should use the parport layer for this |
226 | */ | |
227 | static int __init atp_init(void) | |
228 | { | |
229 | int *port, ports[] = {0x378, 0x278, 0x3bc, 0}; | |
230 | int base_addr = io[0]; | |
231 | ||
232 | if (base_addr > 0x1ff) /* Check a single specified location. */ | |
233 | return atp_probe1(base_addr); | |
234 | else if (base_addr == 1) /* Don't probe at all. */ | |
235 | return -ENXIO; | |
236 | ||
237 | for (port = ports; *port; port++) { | |
238 | long ioaddr = *port; | |
239 | outb(0x57, ioaddr + PAR_DATA); | |
240 | if (inb(ioaddr + PAR_DATA) != 0x57) | |
241 | continue; | |
242 | if (atp_probe1(ioaddr) == 0) | |
243 | return 0; | |
244 | } | |
245 | ||
246 | return -ENODEV; | |
247 | } | |
248 | ||
249 | static int __init atp_probe1(long ioaddr) | |
250 | { | |
251 | struct net_device *dev = NULL; | |
252 | struct net_local *lp; | |
253 | int saved_ctrl_reg, status, i; | |
254 | int res; | |
255 | ||
256 | outb(0xff, ioaddr + PAR_DATA); | |
257 | /* Save the original value of the Control register, in case we guessed | |
258 | wrong. */ | |
259 | saved_ctrl_reg = inb(ioaddr + PAR_CONTROL); | |
260 | if (net_debug > 3) | |
261 | printk("atp: Control register was %#2.2x.\n", saved_ctrl_reg); | |
262 | /* IRQEN=0, SLCTB=high INITB=high, AUTOFDB=high, STBB=high. */ | |
263 | outb(0x04, ioaddr + PAR_CONTROL); | |
264 | #ifndef final_version | |
265 | if (net_debug > 3) { | |
266 | /* Turn off the printer multiplexer on the 8012. */ | |
267 | for (i = 0; i < 8; i++) | |
268 | outb(mux_8012[i], ioaddr + PAR_DATA); | |
269 | write_reg(ioaddr, MODSEL, 0x00); | |
270 | printk("atp: Registers are "); | |
271 | for (i = 0; i < 32; i++) | |
272 | printk(" %2.2x", read_nibble(ioaddr, i)); | |
273 | printk(".\n"); | |
274 | } | |
275 | #endif | |
276 | /* Turn off the printer multiplexer on the 8012. */ | |
277 | for (i = 0; i < 8; i++) | |
278 | outb(mux_8012[i], ioaddr + PAR_DATA); | |
279 | write_reg_high(ioaddr, CMR1, CMR1h_RESET); | |
280 | /* udelay() here? */ | |
281 | status = read_nibble(ioaddr, CMR1); | |
282 | ||
283 | if (net_debug > 3) { | |
284 | printk(KERN_DEBUG "atp: Status nibble was %#2.2x..", status); | |
285 | for (i = 0; i < 32; i++) | |
286 | printk(" %2.2x", read_nibble(ioaddr, i)); | |
287 | printk("\n"); | |
288 | } | |
289 | ||
290 | if ((status & 0x78) != 0x08) { | |
291 | /* The pocket adapter probe failed, restore the control register. */ | |
292 | outb(saved_ctrl_reg, ioaddr + PAR_CONTROL); | |
293 | return -ENODEV; | |
294 | } | |
295 | status = read_nibble(ioaddr, CMR2_h); | |
296 | if ((status & 0x78) != 0x10) { | |
297 | outb(saved_ctrl_reg, ioaddr + PAR_CONTROL); | |
298 | return -ENODEV; | |
299 | } | |
300 | ||
301 | dev = alloc_etherdev(sizeof(struct net_local)); | |
302 | if (!dev) | |
303 | return -ENOMEM; | |
304 | SET_MODULE_OWNER(dev); | |
305 | ||
306 | /* Find the IRQ used by triggering an interrupt. */ | |
307 | write_reg_byte(ioaddr, CMR2, 0x01); /* No accept mode, IRQ out. */ | |
308 | write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); /* Enable Tx and Rx. */ | |
309 | ||
310 | /* Omit autoIRQ routine for now. Use "table lookup" instead. Uhgggh. */ | |
311 | if (irq[0]) | |
312 | dev->irq = irq[0]; | |
313 | else if (ioaddr == 0x378) | |
314 | dev->irq = 7; | |
315 | else | |
316 | dev->irq = 5; | |
317 | write_reg_high(ioaddr, CMR1, CMR1h_TxRxOFF); /* Disable Tx and Rx units. */ | |
318 | write_reg(ioaddr, CMR2, CMR2_NULL); | |
319 | ||
320 | dev->base_addr = ioaddr; | |
321 | ||
322 | /* Read the station address PROM. */ | |
323 | get_node_ID(dev); | |
324 | ||
325 | #ifndef MODULE | |
326 | if (net_debug) | |
327 | printk(KERN_INFO "%s" KERN_INFO "%s", versionA, versionB); | |
328 | #endif | |
329 | ||
330 | printk(KERN_NOTICE "%s: Pocket adapter found at %#3lx, IRQ %d, SAPROM " | |
331 | "%02X:%02X:%02X:%02X:%02X:%02X.\n", dev->name, dev->base_addr, | |
332 | dev->irq, dev->dev_addr[0], dev->dev_addr[1], dev->dev_addr[2], | |
333 | dev->dev_addr[3], dev->dev_addr[4], dev->dev_addr[5]); | |
334 | ||
335 | /* Reset the ethernet hardware and activate the printer pass-through. */ | |
336 | write_reg_high(ioaddr, CMR1, CMR1h_RESET | CMR1h_MUX); | |
337 | ||
338 | lp = netdev_priv(dev); | |
339 | lp->chip_type = RTL8002; | |
340 | lp->addr_mode = CMR2h_Normal; | |
341 | spin_lock_init(&lp->lock); | |
342 | ||
343 | /* For the ATP adapter the "if_port" is really the data transfer mode. */ | |
344 | if (xcvr[0]) | |
345 | dev->if_port = xcvr[0]; | |
346 | else | |
347 | dev->if_port = (dev->mem_start & 0xf) ? (dev->mem_start & 0x7) : 4; | |
348 | if (dev->mem_end & 0xf) | |
349 | net_debug = dev->mem_end & 7; | |
350 | ||
351 | dev->open = net_open; | |
352 | dev->stop = net_close; | |
353 | dev->hard_start_xmit = atp_send_packet; | |
354 | dev->get_stats = net_get_stats; | |
355 | dev->set_multicast_list = | |
356 | lp->chip_type == RTL8002 ? &set_rx_mode_8002 : &set_rx_mode_8012; | |
357 | dev->tx_timeout = tx_timeout; | |
358 | dev->watchdog_timeo = TX_TIMEOUT; | |
359 | ||
360 | res = register_netdev(dev); | |
361 | if (res) { | |
362 | free_netdev(dev); | |
363 | return res; | |
364 | } | |
365 | ||
366 | lp->next_module = root_atp_dev; | |
367 | root_atp_dev = dev; | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | /* Read the station address PROM, usually a word-wide EEPROM. */ | |
373 | static void __init get_node_ID(struct net_device *dev) | |
374 | { | |
375 | long ioaddr = dev->base_addr; | |
376 | int sa_offset = 0; | |
377 | int i; | |
378 | ||
379 | write_reg(ioaddr, CMR2, CMR2_EEPROM); /* Point to the EEPROM control registers. */ | |
380 | ||
381 | /* Some adapters have the station address at offset 15 instead of offset | |
382 | zero. Check for it, and fix it if needed. */ | |
383 | if (eeprom_op(ioaddr, EE_READ(0)) == 0xffff) | |
384 | sa_offset = 15; | |
385 | ||
386 | for (i = 0; i < 3; i++) | |
387 | ((u16 *)dev->dev_addr)[i] = | |
388 | be16_to_cpu(eeprom_op(ioaddr, EE_READ(sa_offset + i))); | |
389 | ||
390 | write_reg(ioaddr, CMR2, CMR2_NULL); | |
391 | } | |
392 | ||
393 | /* | |
394 | An EEPROM read command starts by shifting out 0x60+address, and then | |
395 | shifting in the serial data. See the NatSemi databook for details. | |
396 | * ________________ | |
397 | * CS : __| | |
398 | * ___ ___ | |
399 | * CLK: ______| |___| | | |
400 | * __ _______ _______ | |
401 | * DI : __X_______X_______X | |
402 | * DO : _________X_______X | |
403 | */ | |
404 | ||
405 | static unsigned short __init eeprom_op(long ioaddr, u32 cmd) | |
406 | { | |
407 | unsigned eedata_out = 0; | |
408 | int num_bits = EE_CMD_SIZE; | |
409 | ||
410 | while (--num_bits >= 0) { | |
411 | char outval = (cmd & (1<<num_bits)) ? EE_DATA_WRITE : 0; | |
412 | write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_LOW); | |
413 | write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_HIGH); | |
414 | eedata_out <<= 1; | |
415 | if (read_nibble(ioaddr, PROM_DATA) & EE_DATA_READ) | |
416 | eedata_out++; | |
417 | } | |
418 | write_reg_high(ioaddr, PROM_CMD, EE_CLK_LOW & ~EE_CS); | |
419 | return eedata_out; | |
420 | } | |
421 | ||
422 | ||
423 | /* Open/initialize the board. This is called (in the current kernel) | |
424 | sometime after booting when the 'ifconfig' program is run. | |
425 | ||
426 | This routine sets everything up anew at each open, even | |
427 | registers that "should" only need to be set once at boot, so that | |
428 | there is non-reboot way to recover if something goes wrong. | |
429 | ||
430 | This is an attachable device: if there is no dev->priv entry then it wasn't | |
431 | probed for at boot-time, and we need to probe for it again. | |
432 | */ | |
433 | static int net_open(struct net_device *dev) | |
434 | { | |
435 | struct net_local *lp = netdev_priv(dev); | |
436 | int ret; | |
437 | ||
438 | /* The interrupt line is turned off (tri-stated) when the device isn't in | |
439 | use. That's especially important for "attached" interfaces where the | |
440 | port or interrupt may be shared. */ | |
441 | ret = request_irq(dev->irq, &atp_interrupt, 0, dev->name, dev); | |
442 | if (ret) | |
443 | return ret; | |
444 | ||
445 | hardware_init(dev); | |
446 | ||
447 | init_timer(&lp->timer); | |
448 | lp->timer.expires = jiffies + TIMED_CHECKER; | |
449 | lp->timer.data = (unsigned long)dev; | |
450 | lp->timer.function = &atp_timed_checker; /* timer handler */ | |
451 | add_timer(&lp->timer); | |
452 | ||
453 | netif_start_queue(dev); | |
454 | return 0; | |
455 | } | |
456 | ||
457 | /* This routine resets the hardware. We initialize everything, assuming that | |
458 | the hardware may have been temporarily detached. */ | |
459 | static void hardware_init(struct net_device *dev) | |
460 | { | |
461 | struct net_local *lp = netdev_priv(dev); | |
462 | long ioaddr = dev->base_addr; | |
463 | int i; | |
464 | ||
465 | /* Turn off the printer multiplexer on the 8012. */ | |
466 | for (i = 0; i < 8; i++) | |
467 | outb(mux_8012[i], ioaddr + PAR_DATA); | |
468 | write_reg_high(ioaddr, CMR1, CMR1h_RESET); | |
469 | ||
470 | for (i = 0; i < 6; i++) | |
471 | write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]); | |
472 | ||
473 | write_reg_high(ioaddr, CMR2, lp->addr_mode); | |
474 | ||
475 | if (net_debug > 2) { | |
476 | printk(KERN_DEBUG "%s: Reset: current Rx mode %d.\n", dev->name, | |
477 | (read_nibble(ioaddr, CMR2_h) >> 3) & 0x0f); | |
478 | } | |
479 | ||
480 | write_reg(ioaddr, CMR2, CMR2_IRQOUT); | |
481 | write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); | |
482 | ||
483 | /* Enable the interrupt line from the serial port. */ | |
484 | outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL); | |
485 | ||
486 | /* Unmask the interesting interrupts. */ | |
487 | write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK); | |
488 | write_reg_high(ioaddr, IMR, ISRh_RxErr); | |
489 | ||
490 | lp->tx_unit_busy = 0; | |
491 | lp->pac_cnt_in_tx_buf = 0; | |
492 | lp->saved_tx_size = 0; | |
493 | } | |
494 | ||
495 | static void trigger_send(long ioaddr, int length) | |
496 | { | |
497 | write_reg_byte(ioaddr, TxCNT0, length & 0xff); | |
498 | write_reg(ioaddr, TxCNT1, length >> 8); | |
499 | write_reg(ioaddr, CMR1, CMR1_Xmit); | |
500 | } | |
501 | ||
502 | static void write_packet(long ioaddr, int length, unsigned char *packet, int pad_len, int data_mode) | |
503 | { | |
504 | if (length & 1) | |
505 | { | |
506 | length++; | |
507 | pad_len++; | |
508 | } | |
509 | ||
510 | outb(EOC+MAR, ioaddr + PAR_DATA); | |
511 | if ((data_mode & 1) == 0) { | |
512 | /* Write the packet out, starting with the write addr. */ | |
513 | outb(WrAddr+MAR, ioaddr + PAR_DATA); | |
514 | do { | |
515 | write_byte_mode0(ioaddr, *packet++); | |
516 | } while (--length > pad_len) ; | |
517 | do { | |
518 | write_byte_mode0(ioaddr, 0); | |
519 | } while (--length > 0) ; | |
520 | } else { | |
521 | /* Write the packet out in slow mode. */ | |
522 | unsigned char outbyte = *packet++; | |
523 | ||
524 | outb(Ctrl_LNibWrite + Ctrl_IRQEN, ioaddr + PAR_CONTROL); | |
525 | outb(WrAddr+MAR, ioaddr + PAR_DATA); | |
526 | ||
527 | outb((outbyte & 0x0f)|0x40, ioaddr + PAR_DATA); | |
528 | outb(outbyte & 0x0f, ioaddr + PAR_DATA); | |
529 | outbyte >>= 4; | |
530 | outb(outbyte & 0x0f, ioaddr + PAR_DATA); | |
531 | outb(Ctrl_HNibWrite + Ctrl_IRQEN, ioaddr + PAR_CONTROL); | |
532 | while (--length > pad_len) | |
533 | write_byte_mode1(ioaddr, *packet++); | |
534 | while (--length > 0) | |
535 | write_byte_mode1(ioaddr, 0); | |
536 | } | |
537 | /* Terminate the Tx frame. End of write: ECB. */ | |
538 | outb(0xff, ioaddr + PAR_DATA); | |
539 | outb(Ctrl_HNibWrite | Ctrl_SelData | Ctrl_IRQEN, ioaddr + PAR_CONTROL); | |
540 | } | |
541 | ||
542 | static void tx_timeout(struct net_device *dev) | |
543 | { | |
544 | struct net_local *np = netdev_priv(dev); | |
545 | long ioaddr = dev->base_addr; | |
546 | ||
547 | printk(KERN_WARNING "%s: Transmit timed out, %s?\n", dev->name, | |
548 | inb(ioaddr + PAR_CONTROL) & 0x10 ? "network cable problem" | |
549 | : "IRQ conflict"); | |
550 | np->stats.tx_errors++; | |
551 | /* Try to restart the adapter. */ | |
552 | hardware_init(dev); | |
553 | dev->trans_start = jiffies; | |
554 | netif_wake_queue(dev); | |
555 | np->stats.tx_errors++; | |
556 | } | |
557 | ||
558 | static int atp_send_packet(struct sk_buff *skb, struct net_device *dev) | |
559 | { | |
560 | struct net_local *lp = netdev_priv(dev); | |
561 | long ioaddr = dev->base_addr; | |
562 | int length; | |
563 | unsigned long flags; | |
564 | ||
565 | length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN; | |
566 | ||
567 | netif_stop_queue(dev); | |
568 | ||
569 | /* Disable interrupts by writing 0x00 to the Interrupt Mask Register. | |
570 | This sequence must not be interrupted by an incoming packet. */ | |
571 | ||
572 | spin_lock_irqsave(&lp->lock, flags); | |
573 | write_reg(ioaddr, IMR, 0); | |
574 | write_reg_high(ioaddr, IMR, 0); | |
575 | spin_unlock_irqrestore(&lp->lock, flags); | |
576 | ||
577 | write_packet(ioaddr, length, skb->data, length-skb->len, dev->if_port); | |
578 | ||
579 | lp->pac_cnt_in_tx_buf++; | |
580 | if (lp->tx_unit_busy == 0) { | |
581 | trigger_send(ioaddr, length); | |
582 | lp->saved_tx_size = 0; /* Redundant */ | |
583 | lp->re_tx = 0; | |
584 | lp->tx_unit_busy = 1; | |
585 | } else | |
586 | lp->saved_tx_size = length; | |
587 | /* Re-enable the LPT interrupts. */ | |
588 | write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK); | |
589 | write_reg_high(ioaddr, IMR, ISRh_RxErr); | |
590 | ||
591 | dev->trans_start = jiffies; | |
592 | dev_kfree_skb (skb); | |
593 | return 0; | |
594 | } | |
595 | ||
596 | ||
597 | /* The typical workload of the driver: | |
598 | Handle the network interface interrupts. */ | |
599 | static irqreturn_t | |
600 | atp_interrupt(int irq, void *dev_instance, struct pt_regs * regs) | |
601 | { | |
602 | struct net_device *dev = (struct net_device *)dev_instance; | |
603 | struct net_local *lp; | |
604 | long ioaddr; | |
605 | static int num_tx_since_rx; | |
606 | int boguscount = max_interrupt_work; | |
607 | int handled = 0; | |
608 | ||
609 | if (dev == NULL) { | |
610 | printk(KERN_ERR "ATP_interrupt(): irq %d for unknown device.\n", irq); | |
611 | return IRQ_NONE; | |
612 | } | |
613 | ioaddr = dev->base_addr; | |
614 | lp = netdev_priv(dev); | |
615 | ||
616 | spin_lock(&lp->lock); | |
617 | ||
618 | /* Disable additional spurious interrupts. */ | |
619 | outb(Ctrl_SelData, ioaddr + PAR_CONTROL); | |
620 | ||
621 | /* The adapter's output is currently the IRQ line, switch it to data. */ | |
622 | write_reg(ioaddr, CMR2, CMR2_NULL); | |
623 | write_reg(ioaddr, IMR, 0); | |
624 | ||
625 | if (net_debug > 5) printk(KERN_DEBUG "%s: In interrupt ", dev->name); | |
626 | while (--boguscount > 0) { | |
627 | int status = read_nibble(ioaddr, ISR); | |
628 | if (net_debug > 5) printk("loop status %02x..", status); | |
629 | ||
630 | if (status & (ISR_RxOK<<3)) { | |
631 | handled = 1; | |
632 | write_reg(ioaddr, ISR, ISR_RxOK); /* Clear the Rx interrupt. */ | |
633 | do { | |
634 | int read_status = read_nibble(ioaddr, CMR1); | |
635 | if (net_debug > 6) | |
636 | printk("handling Rx packet %02x..", read_status); | |
637 | /* We acknowledged the normal Rx interrupt, so if the interrupt | |
638 | is still outstanding we must have a Rx error. */ | |
639 | if (read_status & (CMR1_IRQ << 3)) { /* Overrun. */ | |
640 | lp->stats.rx_over_errors++; | |
641 | /* Set to no-accept mode long enough to remove a packet. */ | |
642 | write_reg_high(ioaddr, CMR2, CMR2h_OFF); | |
643 | net_rx(dev); | |
644 | /* Clear the interrupt and return to normal Rx mode. */ | |
645 | write_reg_high(ioaddr, ISR, ISRh_RxErr); | |
646 | write_reg_high(ioaddr, CMR2, lp->addr_mode); | |
647 | } else if ((read_status & (CMR1_BufEnb << 3)) == 0) { | |
648 | net_rx(dev); | |
649 | num_tx_since_rx = 0; | |
650 | } else | |
651 | break; | |
652 | } while (--boguscount > 0); | |
653 | } else if (status & ((ISR_TxErr + ISR_TxOK)<<3)) { | |
654 | handled = 1; | |
655 | if (net_debug > 6) printk("handling Tx done.."); | |
656 | /* Clear the Tx interrupt. We should check for too many failures | |
657 | and reinitialize the adapter. */ | |
658 | write_reg(ioaddr, ISR, ISR_TxErr + ISR_TxOK); | |
659 | if (status & (ISR_TxErr<<3)) { | |
660 | lp->stats.collisions++; | |
661 | if (++lp->re_tx > 15) { | |
662 | lp->stats.tx_aborted_errors++; | |
663 | hardware_init(dev); | |
664 | break; | |
665 | } | |
666 | /* Attempt to retransmit. */ | |
667 | if (net_debug > 6) printk("attempting to ReTx"); | |
668 | write_reg(ioaddr, CMR1, CMR1_ReXmit + CMR1_Xmit); | |
669 | } else { | |
670 | /* Finish up the transmit. */ | |
671 | lp->stats.tx_packets++; | |
672 | lp->pac_cnt_in_tx_buf--; | |
673 | if ( lp->saved_tx_size) { | |
674 | trigger_send(ioaddr, lp->saved_tx_size); | |
675 | lp->saved_tx_size = 0; | |
676 | lp->re_tx = 0; | |
677 | } else | |
678 | lp->tx_unit_busy = 0; | |
679 | netif_wake_queue(dev); /* Inform upper layers. */ | |
680 | } | |
681 | num_tx_since_rx++; | |
682 | } else if (num_tx_since_rx > 8 | |
683 | && time_after(jiffies, dev->last_rx + HZ)) { | |
684 | if (net_debug > 2) | |
685 | printk(KERN_DEBUG "%s: Missed packet? No Rx after %d Tx and " | |
686 | "%ld jiffies status %02x CMR1 %02x.\n", dev->name, | |
687 | num_tx_since_rx, jiffies - dev->last_rx, status, | |
688 | (read_nibble(ioaddr, CMR1) >> 3) & 15); | |
689 | lp->stats.rx_missed_errors++; | |
690 | hardware_init(dev); | |
691 | num_tx_since_rx = 0; | |
692 | break; | |
693 | } else | |
694 | break; | |
695 | } | |
696 | ||
697 | /* This following code fixes a rare (and very difficult to track down) | |
698 | problem where the adapter forgets its ethernet address. */ | |
699 | { | |
700 | int i; | |
701 | for (i = 0; i < 6; i++) | |
702 | write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]); | |
703 | #if 0 && defined(TIMED_CHECKER) | |
704 | mod_timer(&lp->timer, jiffies + TIMED_CHECKER); | |
705 | #endif | |
706 | } | |
707 | ||
708 | /* Tell the adapter that it can go back to using the output line as IRQ. */ | |
709 | write_reg(ioaddr, CMR2, CMR2_IRQOUT); | |
710 | /* Enable the physical interrupt line, which is sure to be low until.. */ | |
711 | outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL); | |
712 | /* .. we enable the interrupt sources. */ | |
713 | write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK); | |
714 | write_reg_high(ioaddr, IMR, ISRh_RxErr); /* Hmmm, really needed? */ | |
715 | ||
716 | spin_unlock(&lp->lock); | |
717 | ||
718 | if (net_debug > 5) printk("exiting interrupt.\n"); | |
719 | return IRQ_RETVAL(handled); | |
720 | } | |
721 | ||
722 | #ifdef TIMED_CHECKER | |
723 | /* This following code fixes a rare (and very difficult to track down) | |
724 | problem where the adapter forgets its ethernet address. */ | |
725 | static void atp_timed_checker(unsigned long data) | |
726 | { | |
727 | struct net_device *dev = (struct net_device *)data; | |
728 | long ioaddr = dev->base_addr; | |
729 | struct net_local *lp = netdev_priv(dev); | |
730 | int tickssofar = jiffies - lp->last_rx_time; | |
731 | int i; | |
732 | ||
733 | spin_lock(&lp->lock); | |
734 | if (tickssofar > 2*HZ) { | |
735 | #if 1 | |
736 | for (i = 0; i < 6; i++) | |
737 | write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]); | |
738 | lp->last_rx_time = jiffies; | |
739 | #else | |
740 | for (i = 0; i < 6; i++) | |
741 | if (read_cmd_byte(ioaddr, PAR0 + i) != atp_timed_dev->dev_addr[i]) | |
742 | { | |
743 | struct net_local *lp = netdev_priv(atp_timed_dev); | |
744 | write_reg_byte(ioaddr, PAR0 + i, atp_timed_dev->dev_addr[i]); | |
745 | if (i == 2) | |
746 | lp->stats.tx_errors++; | |
747 | else if (i == 3) | |
748 | lp->stats.tx_dropped++; | |
749 | else if (i == 4) | |
750 | lp->stats.collisions++; | |
751 | else | |
752 | lp->stats.rx_errors++; | |
753 | } | |
754 | #endif | |
755 | } | |
756 | spin_unlock(&lp->lock); | |
757 | lp->timer.expires = jiffies + TIMED_CHECKER; | |
758 | add_timer(&lp->timer); | |
759 | } | |
760 | #endif | |
761 | ||
762 | /* We have a good packet(s), get it/them out of the buffers. */ | |
763 | static void net_rx(struct net_device *dev) | |
764 | { | |
765 | struct net_local *lp = netdev_priv(dev); | |
766 | long ioaddr = dev->base_addr; | |
767 | struct rx_header rx_head; | |
768 | ||
769 | /* Process the received packet. */ | |
770 | outb(EOC+MAR, ioaddr + PAR_DATA); | |
771 | read_block(ioaddr, 8, (unsigned char*)&rx_head, dev->if_port); | |
772 | if (net_debug > 5) | |
773 | printk(KERN_DEBUG " rx_count %04x %04x %04x %04x..", rx_head.pad, | |
774 | rx_head.rx_count, rx_head.rx_status, rx_head.cur_addr); | |
775 | if ((rx_head.rx_status & 0x77) != 0x01) { | |
776 | lp->stats.rx_errors++; | |
777 | if (rx_head.rx_status & 0x0004) lp->stats.rx_frame_errors++; | |
778 | else if (rx_head.rx_status & 0x0002) lp->stats.rx_crc_errors++; | |
779 | if (net_debug > 3) | |
780 | printk(KERN_DEBUG "%s: Unknown ATP Rx error %04x.\n", | |
781 | dev->name, rx_head.rx_status); | |
782 | if (rx_head.rx_status & 0x0020) { | |
783 | lp->stats.rx_fifo_errors++; | |
784 | write_reg_high(ioaddr, CMR1, CMR1h_TxENABLE); | |
785 | write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); | |
786 | } else if (rx_head.rx_status & 0x0050) | |
787 | hardware_init(dev); | |
788 | return; | |
789 | } else { | |
790 | /* Malloc up new buffer. The "-4" omits the FCS (CRC). */ | |
791 | int pkt_len = (rx_head.rx_count & 0x7ff) - 4; | |
792 | struct sk_buff *skb; | |
793 | ||
794 | skb = dev_alloc_skb(pkt_len + 2); | |
795 | if (skb == NULL) { | |
796 | printk(KERN_ERR "%s: Memory squeeze, dropping packet.\n", | |
797 | dev->name); | |
798 | lp->stats.rx_dropped++; | |
799 | goto done; | |
800 | } | |
801 | skb->dev = dev; | |
802 | ||
803 | skb_reserve(skb, 2); /* Align IP on 16 byte boundaries */ | |
804 | read_block(ioaddr, pkt_len, skb_put(skb,pkt_len), dev->if_port); | |
805 | skb->protocol = eth_type_trans(skb, dev); | |
806 | netif_rx(skb); | |
807 | dev->last_rx = jiffies; | |
808 | lp->stats.rx_packets++; | |
809 | lp->stats.rx_bytes += pkt_len; | |
810 | } | |
811 | done: | |
812 | write_reg(ioaddr, CMR1, CMR1_NextPkt); | |
813 | lp->last_rx_time = jiffies; | |
814 | return; | |
815 | } | |
816 | ||
817 | static void read_block(long ioaddr, int length, unsigned char *p, int data_mode) | |
818 | { | |
819 | ||
820 | if (data_mode <= 3) { /* Mode 0 or 1 */ | |
821 | outb(Ctrl_LNibRead, ioaddr + PAR_CONTROL); | |
822 | outb(length == 8 ? RdAddr | HNib | MAR : RdAddr | MAR, | |
823 | ioaddr + PAR_DATA); | |
824 | if (data_mode <= 1) { /* Mode 0 or 1 */ | |
825 | do *p++ = read_byte_mode0(ioaddr); while (--length > 0); | |
826 | } else /* Mode 2 or 3 */ | |
827 | do *p++ = read_byte_mode2(ioaddr); while (--length > 0); | |
828 | } else if (data_mode <= 5) | |
829 | do *p++ = read_byte_mode4(ioaddr); while (--length > 0); | |
830 | else | |
831 | do *p++ = read_byte_mode6(ioaddr); while (--length > 0); | |
832 | ||
833 | outb(EOC+HNib+MAR, ioaddr + PAR_DATA); | |
834 | outb(Ctrl_SelData, ioaddr + PAR_CONTROL); | |
835 | } | |
836 | ||
837 | /* The inverse routine to net_open(). */ | |
838 | static int | |
839 | net_close(struct net_device *dev) | |
840 | { | |
841 | struct net_local *lp = netdev_priv(dev); | |
842 | long ioaddr = dev->base_addr; | |
843 | ||
844 | netif_stop_queue(dev); | |
845 | ||
846 | del_timer_sync(&lp->timer); | |
847 | ||
848 | /* Flush the Tx and disable Rx here. */ | |
849 | lp->addr_mode = CMR2h_OFF; | |
850 | write_reg_high(ioaddr, CMR2, CMR2h_OFF); | |
851 | ||
852 | /* Free the IRQ line. */ | |
853 | outb(0x00, ioaddr + PAR_CONTROL); | |
854 | free_irq(dev->irq, dev); | |
855 | ||
856 | /* Reset the ethernet hardware and activate the printer pass-through. */ | |
857 | write_reg_high(ioaddr, CMR1, CMR1h_RESET | CMR1h_MUX); | |
858 | return 0; | |
859 | } | |
860 | ||
861 | /* Get the current statistics. This may be called with the card open or | |
862 | closed. */ | |
863 | static struct net_device_stats * | |
864 | net_get_stats(struct net_device *dev) | |
865 | { | |
866 | struct net_local *lp = netdev_priv(dev); | |
867 | return &lp->stats; | |
868 | } | |
869 | ||
870 | /* | |
871 | * Set or clear the multicast filter for this adapter. | |
872 | */ | |
873 | ||
874 | static void set_rx_mode_8002(struct net_device *dev) | |
875 | { | |
876 | struct net_local *lp = netdev_priv(dev); | |
877 | long ioaddr = dev->base_addr; | |
878 | ||
879 | if ( dev->mc_count > 0 || (dev->flags & (IFF_ALLMULTI|IFF_PROMISC))) { | |
880 | /* We must make the kernel realise we had to move | |
881 | * into promisc mode or we start all out war on | |
882 | * the cable. - AC | |
883 | */ | |
884 | dev->flags|=IFF_PROMISC; | |
885 | lp->addr_mode = CMR2h_PROMISC; | |
886 | } else | |
887 | lp->addr_mode = CMR2h_Normal; | |
888 | write_reg_high(ioaddr, CMR2, lp->addr_mode); | |
889 | } | |
890 | ||
891 | static void set_rx_mode_8012(struct net_device *dev) | |
892 | { | |
893 | struct net_local *lp = netdev_priv(dev); | |
894 | long ioaddr = dev->base_addr; | |
895 | unsigned char new_mode, mc_filter[8]; /* Multicast hash filter */ | |
896 | int i; | |
897 | ||
898 | if (dev->flags & IFF_PROMISC) { /* Set promiscuous. */ | |
899 | new_mode = CMR2h_PROMISC; | |
900 | } else if ((dev->mc_count > 1000) || (dev->flags & IFF_ALLMULTI)) { | |
901 | /* Too many to filter perfectly -- accept all multicasts. */ | |
902 | memset(mc_filter, 0xff, sizeof(mc_filter)); | |
903 | new_mode = CMR2h_Normal; | |
904 | } else { | |
905 | struct dev_mc_list *mclist; | |
906 | ||
907 | memset(mc_filter, 0, sizeof(mc_filter)); | |
908 | for (i = 0, mclist = dev->mc_list; mclist && i < dev->mc_count; | |
909 | i++, mclist = mclist->next) | |
910 | { | |
911 | int filterbit = ether_crc_le(ETH_ALEN, mclist->dmi_addr) & 0x3f; | |
912 | mc_filter[filterbit >> 5] |= 1 << (filterbit & 31); | |
913 | } | |
914 | new_mode = CMR2h_Normal; | |
915 | } | |
916 | lp->addr_mode = new_mode; | |
917 | write_reg(ioaddr, CMR2, CMR2_IRQOUT | 0x04); /* Switch to page 1. */ | |
918 | for (i = 0; i < 8; i++) | |
919 | write_reg_byte(ioaddr, i, mc_filter[i]); | |
920 | if (net_debug > 2 || 1) { | |
921 | lp->addr_mode = 1; | |
922 | printk(KERN_DEBUG "%s: Mode %d, setting multicast filter to", | |
923 | dev->name, lp->addr_mode); | |
924 | for (i = 0; i < 8; i++) | |
925 | printk(" %2.2x", mc_filter[i]); | |
926 | printk(".\n"); | |
927 | } | |
928 | ||
929 | write_reg_high(ioaddr, CMR2, lp->addr_mode); | |
930 | write_reg(ioaddr, CMR2, CMR2_IRQOUT); /* Switch back to page 0 */ | |
931 | } | |
932 | ||
933 | static int __init atp_init_module(void) { | |
934 | if (debug) /* Emit version even if no cards detected. */ | |
935 | printk(KERN_INFO "%s" KERN_INFO "%s", versionA, versionB); | |
936 | return atp_init(); | |
937 | } | |
938 | ||
939 | static void __exit atp_cleanup_module(void) { | |
940 | struct net_device *next_dev; | |
941 | ||
942 | while (root_atp_dev) { | |
943 | next_dev = ((struct net_local *)root_atp_dev->priv)->next_module; | |
944 | unregister_netdev(root_atp_dev); | |
945 | /* No need to release_region(), since we never snarf it. */ | |
946 | free_netdev(root_atp_dev); | |
947 | root_atp_dev = next_dev; | |
948 | } | |
949 | } | |
950 | ||
951 | module_init(atp_init_module); | |
952 | module_exit(atp_cleanup_module); |