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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 | ||
2c2a8c53 | 34 | static const char version[] = |
1da177e4 | 35 | "atp.c:v1.09=ac 2002/10/01 Donald Becker <becker@scyld.com>\n"; |
1da177e4 LT |
36 | |
37 | /* The user-configurable values. | |
38 | These may be modified when a driver module is loaded.*/ | |
39 | ||
40 | static int debug = 1; /* 1 normal messages, 0 quiet .. 7 verbose. */ | |
41 | #define net_debug debug | |
42 | ||
43 | /* Maximum events (Rx packets, etc.) to handle at each interrupt. */ | |
44 | static int max_interrupt_work = 15; | |
45 | ||
46 | #define NUM_UNITS 2 | |
47 | /* The standard set of ISA module parameters. */ | |
48 | static int io[NUM_UNITS]; | |
49 | static int irq[NUM_UNITS]; | |
50 | static int xcvr[NUM_UNITS]; /* The data transfer mode. */ | |
51 | ||
52 | /* Operational parameters that are set at compile time. */ | |
53 | ||
54 | /* Time in jiffies before concluding the transmitter is hung. */ | |
55 | #define TX_TIMEOUT (400*HZ/1000) | |
56 | ||
57 | /* | |
58 | This file is a device driver for the RealTek (aka AT-Lan-Tec) pocket | |
59 | ethernet adapter. This is a common low-cost OEM pocket ethernet | |
60 | adapter, sold under many names. | |
61 | ||
62 | Sources: | |
63 | This driver was written from the packet driver assembly code provided by | |
64 | Vincent Bono of AT-Lan-Tec. Ever try to figure out how a complicated | |
65 | device works just from the assembly code? It ain't pretty. The following | |
66 | description is written based on guesses and writing lots of special-purpose | |
67 | code to test my theorized operation. | |
68 | ||
69 | In 1997 Realtek made available the documentation for the second generation | |
70 | RTL8012 chip, which has lead to several driver improvements. | |
631dd1a8 | 71 | http://www.realtek.com.tw/ |
1da177e4 LT |
72 | |
73 | Theory of Operation | |
74 | ||
75 | The RTL8002 adapter seems to be built around a custom spin of the SEEQ | |
76 | controller core. It probably has a 16K or 64K internal packet buffer, of | |
77 | which the first 4K is devoted to transmit and the rest to receive. | |
78 | The controller maintains the queue of received packet and the packet buffer | |
79 | access pointer internally, with only 'reset to beginning' and 'skip to next | |
80 | packet' commands visible. The transmit packet queue holds two (or more?) | |
81 | packets: both 'retransmit this packet' (due to collision) and 'transmit next | |
82 | packet' commands must be started by hand. | |
83 | ||
84 | The station address is stored in a standard bit-serial EEPROM which must be | |
85 | read (ughh) by the device driver. (Provisions have been made for | |
86 | substituting a 74S288 PROM, but I haven't gotten reports of any models | |
87 | using it.) Unlike built-in devices, a pocket adapter can temporarily lose | |
88 | power without indication to the device driver. The major effect is that | |
89 | the station address, receive filter (promiscuous, etc.) and transceiver | |
90 | must be reset. | |
91 | ||
92 | The controller itself has 16 registers, some of which use only the lower | |
93 | bits. The registers are read and written 4 bits at a time. The four bit | |
94 | register address is presented on the data lines along with a few additional | |
95 | timing and control bits. The data is then read from status port or written | |
96 | to the data port. | |
97 | ||
98 | Correction: the controller has two banks of 16 registers. The second | |
99 | bank contains only the multicast filter table (now used) and the EEPROM | |
100 | access registers. | |
101 | ||
102 | Since the bulk data transfer of the actual packets through the slow | |
103 | parallel port dominates the driver's running time, four distinct data | |
104 | (non-register) transfer modes are provided by the adapter, two in each | |
105 | direction. In the first mode timing for the nibble transfers is | |
106 | provided through the data port. In the second mode the same timing is | |
107 | provided through the control port. In either case the data is read from | |
108 | the status port and written to the data port, just as it is accessing | |
109 | registers. | |
110 | ||
111 | In addition to the basic data transfer methods, several more are modes are | |
112 | created by adding some delay by doing multiple reads of the data to allow | |
113 | it to stabilize. This delay seems to be needed on most machines. | |
114 | ||
115 | The data transfer mode is stored in the 'dev->if_port' field. Its default | |
116 | value is '4'. It may be overridden at boot-time using the third parameter | |
117 | to the "ether=..." initialization. | |
118 | ||
119 | The header file <atp.h> provides inline functions that encapsulate the | |
120 | register and data access methods. These functions are hand-tuned to | |
121 | generate reasonable object code. This header file also documents my | |
122 | interpretations of the device registers. | |
123 | */ | |
124 | ||
125 | #include <linux/kernel.h> | |
126 | #include <linux/module.h> | |
127 | #include <linux/types.h> | |
128 | #include <linux/fcntl.h> | |
129 | #include <linux/interrupt.h> | |
130 | #include <linux/ioport.h> | |
131 | #include <linux/in.h> | |
1da177e4 LT |
132 | #include <linux/string.h> |
133 | #include <linux/errno.h> | |
134 | #include <linux/init.h> | |
135 | #include <linux/crc32.h> | |
136 | #include <linux/netdevice.h> | |
137 | #include <linux/etherdevice.h> | |
138 | #include <linux/skbuff.h> | |
139 | #include <linux/spinlock.h> | |
140 | #include <linux/delay.h> | |
141 | #include <linux/bitops.h> | |
142 | ||
1da177e4 LT |
143 | #include <asm/io.h> |
144 | #include <asm/dma.h> | |
145 | ||
146 | #include "atp.h" | |
147 | ||
148 | MODULE_AUTHOR("Donald Becker <becker@scyld.com>"); | |
149 | MODULE_DESCRIPTION("RealTek RTL8002/8012 parallel port Ethernet driver"); | |
150 | MODULE_LICENSE("GPL"); | |
151 | ||
152 | module_param(max_interrupt_work, int, 0); | |
153 | module_param(debug, int, 0); | |
df298408 DH |
154 | module_param_hw_array(io, int, ioport, NULL, 0); |
155 | module_param_hw_array(irq, int, irq, NULL, 0); | |
1da177e4 LT |
156 | module_param_array(xcvr, int, NULL, 0); |
157 | MODULE_PARM_DESC(max_interrupt_work, "ATP maximum events handled per interrupt"); | |
158 | MODULE_PARM_DESC(debug, "ATP debug level (0-7)"); | |
159 | MODULE_PARM_DESC(io, "ATP I/O base address(es)"); | |
160 | MODULE_PARM_DESC(irq, "ATP IRQ number(s)"); | |
161 | MODULE_PARM_DESC(xcvr, "ATP transceiver(s) (0=internal, 1=external)"); | |
162 | ||
163 | /* The number of low I/O ports used by the ethercard. */ | |
164 | #define ETHERCARD_TOTAL_SIZE 3 | |
165 | ||
166 | /* Sequence to switch an 8012 from printer mux to ethernet mode. */ | |
167 | static char mux_8012[] = { 0xff, 0xf7, 0xff, 0xfb, 0xf3, 0xfb, 0xff, 0xf7,}; | |
168 | ||
169 | struct net_local { | |
170 | spinlock_t lock; | |
171 | struct net_device *next_module; | |
1da177e4 | 172 | struct timer_list timer; /* Media selection timer. */ |
4a7c9726 | 173 | unsigned long last_rx_time; /* Last Rx, in jiffies, to handle Rx hang. */ |
1da177e4 LT |
174 | int saved_tx_size; |
175 | unsigned int tx_unit_busy:1; | |
176 | unsigned char re_tx, /* Number of packet retransmissions. */ | |
177 | addr_mode, /* Current Rx filter e.g. promiscuous, etc. */ | |
bb263e18 | 178 | pac_cnt_in_tx_buf; |
1da177e4 LT |
179 | }; |
180 | ||
181 | /* This code, written by wwc@super.org, resets the adapter every | |
182 | TIMED_CHECKER ticks. This recovers from an unknown error which | |
183 | hangs the device. */ | |
184 | #define TIMED_CHECKER (HZ/4) | |
185 | #ifdef TIMED_CHECKER | |
186 | #include <linux/timer.h> | |
187 | static void atp_timed_checker(unsigned long ignored); | |
188 | #endif | |
189 | ||
190 | /* Index to functions, as function prototypes. */ | |
191 | ||
192 | static int atp_probe1(long ioaddr); | |
193 | static void get_node_ID(struct net_device *dev); | |
194 | static unsigned short eeprom_op(long ioaddr, unsigned int cmd); | |
195 | static int net_open(struct net_device *dev); | |
196 | static void hardware_init(struct net_device *dev); | |
197 | static void write_packet(long ioaddr, int length, unsigned char *packet, int pad, int mode); | |
198 | static void trigger_send(long ioaddr, int length); | |
61357325 SH |
199 | static netdev_tx_t atp_send_packet(struct sk_buff *skb, |
200 | struct net_device *dev); | |
7d12e780 | 201 | static irqreturn_t atp_interrupt(int irq, void *dev_id); |
1da177e4 LT |
202 | static void net_rx(struct net_device *dev); |
203 | static void read_block(long ioaddr, int length, unsigned char *buffer, int data_mode); | |
204 | static int net_close(struct net_device *dev); | |
3a1a27fa | 205 | static void set_rx_mode(struct net_device *dev); |
1da177e4 LT |
206 | static void tx_timeout(struct net_device *dev); |
207 | ||
208 | ||
209 | /* A list of all installed ATP devices, for removing the driver module. */ | |
210 | static struct net_device *root_atp_dev; | |
211 | ||
212 | /* Check for a network adapter of this type, and return '0' iff one exists. | |
213 | If dev->base_addr == 0, probe all likely locations. | |
214 | If dev->base_addr == 1, always return failure. | |
215 | If dev->base_addr == 2, allocate space for the device and return success | |
216 | (detachable devices only). | |
6aa20a22 | 217 | |
1da177e4 LT |
218 | FIXME: we should use the parport layer for this |
219 | */ | |
220 | static int __init atp_init(void) | |
221 | { | |
222 | int *port, ports[] = {0x378, 0x278, 0x3bc, 0}; | |
223 | int base_addr = io[0]; | |
224 | ||
225 | if (base_addr > 0x1ff) /* Check a single specified location. */ | |
226 | return atp_probe1(base_addr); | |
227 | else if (base_addr == 1) /* Don't probe at all. */ | |
228 | return -ENXIO; | |
229 | ||
230 | for (port = ports; *port; port++) { | |
231 | long ioaddr = *port; | |
232 | outb(0x57, ioaddr + PAR_DATA); | |
233 | if (inb(ioaddr + PAR_DATA) != 0x57) | |
234 | continue; | |
235 | if (atp_probe1(ioaddr) == 0) | |
236 | return 0; | |
237 | } | |
238 | ||
239 | return -ENODEV; | |
240 | } | |
241 | ||
3a1a27fa SH |
242 | static const struct net_device_ops atp_netdev_ops = { |
243 | .ndo_open = net_open, | |
244 | .ndo_stop = net_close, | |
245 | .ndo_start_xmit = atp_send_packet, | |
afc4b13d | 246 | .ndo_set_rx_mode = set_rx_mode, |
3a1a27fa | 247 | .ndo_tx_timeout = tx_timeout, |
3a1a27fa SH |
248 | .ndo_set_mac_address = eth_mac_addr, |
249 | .ndo_validate_addr = eth_validate_addr, | |
250 | }; | |
251 | ||
1da177e4 LT |
252 | static int __init atp_probe1(long ioaddr) |
253 | { | |
254 | struct net_device *dev = NULL; | |
255 | struct net_local *lp; | |
256 | int saved_ctrl_reg, status, i; | |
257 | int res; | |
258 | ||
259 | outb(0xff, ioaddr + PAR_DATA); | |
260 | /* Save the original value of the Control register, in case we guessed | |
261 | wrong. */ | |
262 | saved_ctrl_reg = inb(ioaddr + PAR_CONTROL); | |
263 | if (net_debug > 3) | |
264 | printk("atp: Control register was %#2.2x.\n", saved_ctrl_reg); | |
265 | /* IRQEN=0, SLCTB=high INITB=high, AUTOFDB=high, STBB=high. */ | |
266 | outb(0x04, ioaddr + PAR_CONTROL); | |
267 | #ifndef final_version | |
268 | if (net_debug > 3) { | |
269 | /* Turn off the printer multiplexer on the 8012. */ | |
270 | for (i = 0; i < 8; i++) | |
271 | outb(mux_8012[i], ioaddr + PAR_DATA); | |
272 | write_reg(ioaddr, MODSEL, 0x00); | |
273 | printk("atp: Registers are "); | |
274 | for (i = 0; i < 32; i++) | |
275 | printk(" %2.2x", read_nibble(ioaddr, i)); | |
276 | printk(".\n"); | |
277 | } | |
278 | #endif | |
279 | /* Turn off the printer multiplexer on the 8012. */ | |
280 | for (i = 0; i < 8; i++) | |
281 | outb(mux_8012[i], ioaddr + PAR_DATA); | |
282 | write_reg_high(ioaddr, CMR1, CMR1h_RESET); | |
283 | /* udelay() here? */ | |
284 | status = read_nibble(ioaddr, CMR1); | |
285 | ||
286 | if (net_debug > 3) { | |
287 | printk(KERN_DEBUG "atp: Status nibble was %#2.2x..", status); | |
288 | for (i = 0; i < 32; i++) | |
289 | printk(" %2.2x", read_nibble(ioaddr, i)); | |
290 | printk("\n"); | |
291 | } | |
292 | ||
293 | if ((status & 0x78) != 0x08) { | |
294 | /* The pocket adapter probe failed, restore the control register. */ | |
295 | outb(saved_ctrl_reg, ioaddr + PAR_CONTROL); | |
296 | return -ENODEV; | |
297 | } | |
298 | status = read_nibble(ioaddr, CMR2_h); | |
299 | if ((status & 0x78) != 0x10) { | |
300 | outb(saved_ctrl_reg, ioaddr + PAR_CONTROL); | |
301 | return -ENODEV; | |
302 | } | |
303 | ||
304 | dev = alloc_etherdev(sizeof(struct net_local)); | |
305 | if (!dev) | |
306 | return -ENOMEM; | |
1da177e4 LT |
307 | |
308 | /* Find the IRQ used by triggering an interrupt. */ | |
309 | write_reg_byte(ioaddr, CMR2, 0x01); /* No accept mode, IRQ out. */ | |
310 | write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); /* Enable Tx and Rx. */ | |
311 | ||
312 | /* Omit autoIRQ routine for now. Use "table lookup" instead. Uhgggh. */ | |
313 | if (irq[0]) | |
314 | dev->irq = irq[0]; | |
315 | else if (ioaddr == 0x378) | |
316 | dev->irq = 7; | |
317 | else | |
318 | dev->irq = 5; | |
319 | write_reg_high(ioaddr, CMR1, CMR1h_TxRxOFF); /* Disable Tx and Rx units. */ | |
320 | write_reg(ioaddr, CMR2, CMR2_NULL); | |
321 | ||
322 | dev->base_addr = ioaddr; | |
323 | ||
324 | /* Read the station address PROM. */ | |
325 | get_node_ID(dev); | |
326 | ||
327 | #ifndef MODULE | |
328 | if (net_debug) | |
2c2a8c53 | 329 | printk(KERN_INFO "%s", version); |
1da177e4 LT |
330 | #endif |
331 | ||
0795af57 | 332 | printk(KERN_NOTICE "%s: Pocket adapter found at %#3lx, IRQ %d, " |
e174961c JB |
333 | "SAPROM %pM.\n", |
334 | dev->name, dev->base_addr, dev->irq, dev->dev_addr); | |
1da177e4 LT |
335 | |
336 | /* Reset the ethernet hardware and activate the printer pass-through. */ | |
337 | write_reg_high(ioaddr, CMR1, CMR1h_RESET | CMR1h_MUX); | |
338 | ||
339 | lp = netdev_priv(dev); | |
1da177e4 LT |
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 | ||
3a1a27fa | 351 | dev->netdev_ops = &atp_netdev_ops; |
1da177e4 LT |
352 | dev->watchdog_timeo = TX_TIMEOUT; |
353 | ||
354 | res = register_netdev(dev); | |
355 | if (res) { | |
356 | free_netdev(dev); | |
357 | return res; | |
358 | } | |
359 | ||
360 | lp->next_module = root_atp_dev; | |
361 | root_atp_dev = dev; | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | /* Read the station address PROM, usually a word-wide EEPROM. */ | |
367 | static void __init get_node_ID(struct net_device *dev) | |
368 | { | |
369 | long ioaddr = dev->base_addr; | |
370 | int sa_offset = 0; | |
371 | int i; | |
372 | ||
373 | write_reg(ioaddr, CMR2, CMR2_EEPROM); /* Point to the EEPROM control registers. */ | |
374 | ||
375 | /* Some adapters have the station address at offset 15 instead of offset | |
376 | zero. Check for it, and fix it if needed. */ | |
377 | if (eeprom_op(ioaddr, EE_READ(0)) == 0xffff) | |
378 | sa_offset = 15; | |
379 | ||
380 | for (i = 0; i < 3; i++) | |
eca1ad82 AV |
381 | ((__be16 *)dev->dev_addr)[i] = |
382 | cpu_to_be16(eeprom_op(ioaddr, EE_READ(sa_offset + i))); | |
1da177e4 LT |
383 | |
384 | write_reg(ioaddr, CMR2, CMR2_NULL); | |
385 | } | |
386 | ||
387 | /* | |
388 | An EEPROM read command starts by shifting out 0x60+address, and then | |
389 | shifting in the serial data. See the NatSemi databook for details. | |
390 | * ________________ | |
391 | * CS : __| | |
392 | * ___ ___ | |
393 | * CLK: ______| |___| | | |
394 | * __ _______ _______ | |
395 | * DI : __X_______X_______X | |
396 | * DO : _________X_______X | |
397 | */ | |
398 | ||
399 | static unsigned short __init eeprom_op(long ioaddr, u32 cmd) | |
400 | { | |
401 | unsigned eedata_out = 0; | |
402 | int num_bits = EE_CMD_SIZE; | |
403 | ||
404 | while (--num_bits >= 0) { | |
405 | char outval = (cmd & (1<<num_bits)) ? EE_DATA_WRITE : 0; | |
406 | write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_LOW); | |
407 | write_reg_high(ioaddr, PROM_CMD, outval | EE_CLK_HIGH); | |
408 | eedata_out <<= 1; | |
409 | if (read_nibble(ioaddr, PROM_DATA) & EE_DATA_READ) | |
410 | eedata_out++; | |
411 | } | |
412 | write_reg_high(ioaddr, PROM_CMD, EE_CLK_LOW & ~EE_CS); | |
413 | return eedata_out; | |
414 | } | |
415 | ||
416 | ||
417 | /* Open/initialize the board. This is called (in the current kernel) | |
418 | sometime after booting when the 'ifconfig' program is run. | |
419 | ||
420 | This routine sets everything up anew at each open, even | |
421 | registers that "should" only need to be set once at boot, so that | |
422 | there is non-reboot way to recover if something goes wrong. | |
423 | ||
b74ca3a8 | 424 | This is an attachable device: if there is no private entry then it wasn't |
1da177e4 LT |
425 | probed for at boot-time, and we need to probe for it again. |
426 | */ | |
427 | static int net_open(struct net_device *dev) | |
428 | { | |
429 | struct net_local *lp = netdev_priv(dev); | |
430 | int ret; | |
431 | ||
432 | /* The interrupt line is turned off (tri-stated) when the device isn't in | |
433 | use. That's especially important for "attached" interfaces where the | |
434 | port or interrupt may be shared. */ | |
a0607fd3 | 435 | ret = request_irq(dev->irq, atp_interrupt, 0, dev->name, dev); |
1da177e4 LT |
436 | if (ret) |
437 | return ret; | |
438 | ||
439 | hardware_init(dev); | |
440 | ||
441 | init_timer(&lp->timer); | |
442 | lp->timer.expires = jiffies + TIMED_CHECKER; | |
443 | lp->timer.data = (unsigned long)dev; | |
c061b18d | 444 | lp->timer.function = atp_timed_checker; /* timer handler */ |
1da177e4 LT |
445 | add_timer(&lp->timer); |
446 | ||
447 | netif_start_queue(dev); | |
448 | return 0; | |
449 | } | |
450 | ||
451 | /* This routine resets the hardware. We initialize everything, assuming that | |
452 | the hardware may have been temporarily detached. */ | |
453 | static void hardware_init(struct net_device *dev) | |
454 | { | |
455 | struct net_local *lp = netdev_priv(dev); | |
456 | long ioaddr = dev->base_addr; | |
457 | int i; | |
458 | ||
459 | /* Turn off the printer multiplexer on the 8012. */ | |
460 | for (i = 0; i < 8; i++) | |
461 | outb(mux_8012[i], ioaddr + PAR_DATA); | |
462 | write_reg_high(ioaddr, CMR1, CMR1h_RESET); | |
463 | ||
464 | for (i = 0; i < 6; i++) | |
465 | write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]); | |
466 | ||
467 | write_reg_high(ioaddr, CMR2, lp->addr_mode); | |
468 | ||
469 | if (net_debug > 2) { | |
470 | printk(KERN_DEBUG "%s: Reset: current Rx mode %d.\n", dev->name, | |
471 | (read_nibble(ioaddr, CMR2_h) >> 3) & 0x0f); | |
472 | } | |
473 | ||
474 | write_reg(ioaddr, CMR2, CMR2_IRQOUT); | |
475 | write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); | |
476 | ||
477 | /* Enable the interrupt line from the serial port. */ | |
478 | outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL); | |
479 | ||
480 | /* Unmask the interesting interrupts. */ | |
481 | write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK); | |
482 | write_reg_high(ioaddr, IMR, ISRh_RxErr); | |
483 | ||
484 | lp->tx_unit_busy = 0; | |
485 | lp->pac_cnt_in_tx_buf = 0; | |
486 | lp->saved_tx_size = 0; | |
487 | } | |
488 | ||
489 | static void trigger_send(long ioaddr, int length) | |
490 | { | |
491 | write_reg_byte(ioaddr, TxCNT0, length & 0xff); | |
492 | write_reg(ioaddr, TxCNT1, length >> 8); | |
493 | write_reg(ioaddr, CMR1, CMR1_Xmit); | |
494 | } | |
495 | ||
496 | static void write_packet(long ioaddr, int length, unsigned char *packet, int pad_len, int data_mode) | |
497 | { | |
498 | if (length & 1) | |
499 | { | |
500 | length++; | |
501 | pad_len++; | |
502 | } | |
503 | ||
504 | outb(EOC+MAR, ioaddr + PAR_DATA); | |
505 | if ((data_mode & 1) == 0) { | |
506 | /* Write the packet out, starting with the write addr. */ | |
507 | outb(WrAddr+MAR, ioaddr + PAR_DATA); | |
508 | do { | |
509 | write_byte_mode0(ioaddr, *packet++); | |
510 | } while (--length > pad_len) ; | |
511 | do { | |
512 | write_byte_mode0(ioaddr, 0); | |
513 | } while (--length > 0) ; | |
514 | } else { | |
515 | /* Write the packet out in slow mode. */ | |
516 | unsigned char outbyte = *packet++; | |
517 | ||
518 | outb(Ctrl_LNibWrite + Ctrl_IRQEN, ioaddr + PAR_CONTROL); | |
519 | outb(WrAddr+MAR, ioaddr + PAR_DATA); | |
520 | ||
521 | outb((outbyte & 0x0f)|0x40, ioaddr + PAR_DATA); | |
522 | outb(outbyte & 0x0f, ioaddr + PAR_DATA); | |
523 | outbyte >>= 4; | |
524 | outb(outbyte & 0x0f, ioaddr + PAR_DATA); | |
525 | outb(Ctrl_HNibWrite + Ctrl_IRQEN, ioaddr + PAR_CONTROL); | |
526 | while (--length > pad_len) | |
527 | write_byte_mode1(ioaddr, *packet++); | |
528 | while (--length > 0) | |
529 | write_byte_mode1(ioaddr, 0); | |
530 | } | |
531 | /* Terminate the Tx frame. End of write: ECB. */ | |
532 | outb(0xff, ioaddr + PAR_DATA); | |
533 | outb(Ctrl_HNibWrite | Ctrl_SelData | Ctrl_IRQEN, ioaddr + PAR_CONTROL); | |
534 | } | |
535 | ||
536 | static void tx_timeout(struct net_device *dev) | |
537 | { | |
1da177e4 LT |
538 | long ioaddr = dev->base_addr; |
539 | ||
540 | printk(KERN_WARNING "%s: Transmit timed out, %s?\n", dev->name, | |
541 | inb(ioaddr + PAR_CONTROL) & 0x10 ? "network cable problem" | |
542 | : "IRQ conflict"); | |
09f75cd7 | 543 | dev->stats.tx_errors++; |
1da177e4 LT |
544 | /* Try to restart the adapter. */ |
545 | hardware_init(dev); | |
860e9538 | 546 | netif_trans_update(dev); /* prevent tx timeout */ |
1da177e4 | 547 | netif_wake_queue(dev); |
09f75cd7 | 548 | dev->stats.tx_errors++; |
1da177e4 LT |
549 | } |
550 | ||
61357325 SH |
551 | static netdev_tx_t atp_send_packet(struct sk_buff *skb, |
552 | struct net_device *dev) | |
1da177e4 LT |
553 | { |
554 | struct net_local *lp = netdev_priv(dev); | |
555 | long ioaddr = dev->base_addr; | |
556 | int length; | |
557 | unsigned long flags; | |
558 | ||
559 | length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN; | |
560 | ||
561 | netif_stop_queue(dev); | |
562 | ||
563 | /* Disable interrupts by writing 0x00 to the Interrupt Mask Register. | |
564 | This sequence must not be interrupted by an incoming packet. */ | |
565 | ||
566 | spin_lock_irqsave(&lp->lock, flags); | |
567 | write_reg(ioaddr, IMR, 0); | |
568 | write_reg_high(ioaddr, IMR, 0); | |
569 | spin_unlock_irqrestore(&lp->lock, flags); | |
570 | ||
571 | write_packet(ioaddr, length, skb->data, length-skb->len, dev->if_port); | |
572 | ||
573 | lp->pac_cnt_in_tx_buf++; | |
574 | if (lp->tx_unit_busy == 0) { | |
575 | trigger_send(ioaddr, length); | |
576 | lp->saved_tx_size = 0; /* Redundant */ | |
577 | lp->re_tx = 0; | |
578 | lp->tx_unit_busy = 1; | |
579 | } else | |
580 | lp->saved_tx_size = length; | |
581 | /* Re-enable the LPT interrupts. */ | |
582 | write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK); | |
583 | write_reg_high(ioaddr, IMR, ISRh_RxErr); | |
584 | ||
1da177e4 | 585 | dev_kfree_skb (skb); |
6ed10654 | 586 | return NETDEV_TX_OK; |
1da177e4 LT |
587 | } |
588 | ||
589 | ||
590 | /* The typical workload of the driver: | |
591 | Handle the network interface interrupts. */ | |
7d12e780 | 592 | static irqreturn_t atp_interrupt(int irq, void *dev_instance) |
1da177e4 | 593 | { |
c31f28e7 | 594 | struct net_device *dev = dev_instance; |
1da177e4 LT |
595 | struct net_local *lp; |
596 | long ioaddr; | |
597 | static int num_tx_since_rx; | |
598 | int boguscount = max_interrupt_work; | |
599 | int handled = 0; | |
600 | ||
1da177e4 LT |
601 | ioaddr = dev->base_addr; |
602 | lp = netdev_priv(dev); | |
603 | ||
604 | spin_lock(&lp->lock); | |
605 | ||
606 | /* Disable additional spurious interrupts. */ | |
607 | outb(Ctrl_SelData, ioaddr + PAR_CONTROL); | |
608 | ||
609 | /* The adapter's output is currently the IRQ line, switch it to data. */ | |
610 | write_reg(ioaddr, CMR2, CMR2_NULL); | |
611 | write_reg(ioaddr, IMR, 0); | |
612 | ||
613 | if (net_debug > 5) printk(KERN_DEBUG "%s: In interrupt ", dev->name); | |
614 | while (--boguscount > 0) { | |
615 | int status = read_nibble(ioaddr, ISR); | |
616 | if (net_debug > 5) printk("loop status %02x..", status); | |
617 | ||
618 | if (status & (ISR_RxOK<<3)) { | |
619 | handled = 1; | |
620 | write_reg(ioaddr, ISR, ISR_RxOK); /* Clear the Rx interrupt. */ | |
621 | do { | |
622 | int read_status = read_nibble(ioaddr, CMR1); | |
623 | if (net_debug > 6) | |
624 | printk("handling Rx packet %02x..", read_status); | |
625 | /* We acknowledged the normal Rx interrupt, so if the interrupt | |
626 | is still outstanding we must have a Rx error. */ | |
627 | if (read_status & (CMR1_IRQ << 3)) { /* Overrun. */ | |
09f75cd7 | 628 | dev->stats.rx_over_errors++; |
1da177e4 LT |
629 | /* Set to no-accept mode long enough to remove a packet. */ |
630 | write_reg_high(ioaddr, CMR2, CMR2h_OFF); | |
631 | net_rx(dev); | |
632 | /* Clear the interrupt and return to normal Rx mode. */ | |
633 | write_reg_high(ioaddr, ISR, ISRh_RxErr); | |
634 | write_reg_high(ioaddr, CMR2, lp->addr_mode); | |
635 | } else if ((read_status & (CMR1_BufEnb << 3)) == 0) { | |
636 | net_rx(dev); | |
637 | num_tx_since_rx = 0; | |
638 | } else | |
639 | break; | |
640 | } while (--boguscount > 0); | |
641 | } else if (status & ((ISR_TxErr + ISR_TxOK)<<3)) { | |
642 | handled = 1; | |
643 | if (net_debug > 6) printk("handling Tx done.."); | |
644 | /* Clear the Tx interrupt. We should check for too many failures | |
645 | and reinitialize the adapter. */ | |
646 | write_reg(ioaddr, ISR, ISR_TxErr + ISR_TxOK); | |
647 | if (status & (ISR_TxErr<<3)) { | |
09f75cd7 | 648 | dev->stats.collisions++; |
1da177e4 | 649 | if (++lp->re_tx > 15) { |
09f75cd7 | 650 | dev->stats.tx_aborted_errors++; |
1da177e4 LT |
651 | hardware_init(dev); |
652 | break; | |
653 | } | |
654 | /* Attempt to retransmit. */ | |
655 | if (net_debug > 6) printk("attempting to ReTx"); | |
656 | write_reg(ioaddr, CMR1, CMR1_ReXmit + CMR1_Xmit); | |
657 | } else { | |
658 | /* Finish up the transmit. */ | |
09f75cd7 | 659 | dev->stats.tx_packets++; |
1da177e4 LT |
660 | lp->pac_cnt_in_tx_buf--; |
661 | if ( lp->saved_tx_size) { | |
662 | trigger_send(ioaddr, lp->saved_tx_size); | |
663 | lp->saved_tx_size = 0; | |
664 | lp->re_tx = 0; | |
665 | } else | |
666 | lp->tx_unit_busy = 0; | |
667 | netif_wake_queue(dev); /* Inform upper layers. */ | |
668 | } | |
669 | num_tx_since_rx++; | |
8e95a202 | 670 | } else if (num_tx_since_rx > 8 && |
4a7c9726 | 671 | time_after(jiffies, lp->last_rx_time + HZ)) { |
1da177e4 LT |
672 | if (net_debug > 2) |
673 | printk(KERN_DEBUG "%s: Missed packet? No Rx after %d Tx and " | |
674 | "%ld jiffies status %02x CMR1 %02x.\n", dev->name, | |
4a7c9726 | 675 | num_tx_since_rx, jiffies - lp->last_rx_time, status, |
1da177e4 | 676 | (read_nibble(ioaddr, CMR1) >> 3) & 15); |
09f75cd7 | 677 | dev->stats.rx_missed_errors++; |
1da177e4 LT |
678 | hardware_init(dev); |
679 | num_tx_since_rx = 0; | |
680 | break; | |
681 | } else | |
682 | break; | |
683 | } | |
684 | ||
685 | /* This following code fixes a rare (and very difficult to track down) | |
686 | problem where the adapter forgets its ethernet address. */ | |
687 | { | |
688 | int i; | |
689 | for (i = 0; i < 6; i++) | |
690 | write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]); | |
691 | #if 0 && defined(TIMED_CHECKER) | |
692 | mod_timer(&lp->timer, jiffies + TIMED_CHECKER); | |
693 | #endif | |
694 | } | |
695 | ||
696 | /* Tell the adapter that it can go back to using the output line as IRQ. */ | |
697 | write_reg(ioaddr, CMR2, CMR2_IRQOUT); | |
698 | /* Enable the physical interrupt line, which is sure to be low until.. */ | |
699 | outb(Ctrl_SelData + Ctrl_IRQEN, ioaddr + PAR_CONTROL); | |
700 | /* .. we enable the interrupt sources. */ | |
701 | write_reg(ioaddr, IMR, ISR_RxOK | ISR_TxErr | ISR_TxOK); | |
702 | write_reg_high(ioaddr, IMR, ISRh_RxErr); /* Hmmm, really needed? */ | |
703 | ||
704 | spin_unlock(&lp->lock); | |
705 | ||
706 | if (net_debug > 5) printk("exiting interrupt.\n"); | |
707 | return IRQ_RETVAL(handled); | |
708 | } | |
709 | ||
710 | #ifdef TIMED_CHECKER | |
711 | /* This following code fixes a rare (and very difficult to track down) | |
712 | problem where the adapter forgets its ethernet address. */ | |
713 | static void atp_timed_checker(unsigned long data) | |
714 | { | |
715 | struct net_device *dev = (struct net_device *)data; | |
716 | long ioaddr = dev->base_addr; | |
717 | struct net_local *lp = netdev_priv(dev); | |
718 | int tickssofar = jiffies - lp->last_rx_time; | |
719 | int i; | |
720 | ||
721 | spin_lock(&lp->lock); | |
722 | if (tickssofar > 2*HZ) { | |
723 | #if 1 | |
724 | for (i = 0; i < 6; i++) | |
725 | write_reg_byte(ioaddr, PAR0 + i, dev->dev_addr[i]); | |
726 | lp->last_rx_time = jiffies; | |
727 | #else | |
728 | for (i = 0; i < 6; i++) | |
729 | if (read_cmd_byte(ioaddr, PAR0 + i) != atp_timed_dev->dev_addr[i]) | |
730 | { | |
731 | struct net_local *lp = netdev_priv(atp_timed_dev); | |
732 | write_reg_byte(ioaddr, PAR0 + i, atp_timed_dev->dev_addr[i]); | |
733 | if (i == 2) | |
09f75cd7 | 734 | dev->stats.tx_errors++; |
1da177e4 | 735 | else if (i == 3) |
09f75cd7 | 736 | dev->stats.tx_dropped++; |
1da177e4 | 737 | else if (i == 4) |
09f75cd7 | 738 | dev->stats.collisions++; |
1da177e4 | 739 | else |
09f75cd7 | 740 | dev->stats.rx_errors++; |
1da177e4 LT |
741 | } |
742 | #endif | |
743 | } | |
744 | spin_unlock(&lp->lock); | |
745 | lp->timer.expires = jiffies + TIMED_CHECKER; | |
746 | add_timer(&lp->timer); | |
747 | } | |
748 | #endif | |
749 | ||
750 | /* We have a good packet(s), get it/them out of the buffers. */ | |
751 | static void net_rx(struct net_device *dev) | |
752 | { | |
753 | struct net_local *lp = netdev_priv(dev); | |
754 | long ioaddr = dev->base_addr; | |
755 | struct rx_header rx_head; | |
756 | ||
757 | /* Process the received packet. */ | |
758 | outb(EOC+MAR, ioaddr + PAR_DATA); | |
759 | read_block(ioaddr, 8, (unsigned char*)&rx_head, dev->if_port); | |
760 | if (net_debug > 5) | |
761 | printk(KERN_DEBUG " rx_count %04x %04x %04x %04x..", rx_head.pad, | |
762 | rx_head.rx_count, rx_head.rx_status, rx_head.cur_addr); | |
763 | if ((rx_head.rx_status & 0x77) != 0x01) { | |
09f75cd7 JG |
764 | dev->stats.rx_errors++; |
765 | if (rx_head.rx_status & 0x0004) dev->stats.rx_frame_errors++; | |
766 | else if (rx_head.rx_status & 0x0002) dev->stats.rx_crc_errors++; | |
1da177e4 LT |
767 | if (net_debug > 3) |
768 | printk(KERN_DEBUG "%s: Unknown ATP Rx error %04x.\n", | |
769 | dev->name, rx_head.rx_status); | |
770 | if (rx_head.rx_status & 0x0020) { | |
09f75cd7 | 771 | dev->stats.rx_fifo_errors++; |
1da177e4 LT |
772 | write_reg_high(ioaddr, CMR1, CMR1h_TxENABLE); |
773 | write_reg_high(ioaddr, CMR1, CMR1h_RxENABLE | CMR1h_TxENABLE); | |
774 | } else if (rx_head.rx_status & 0x0050) | |
775 | hardware_init(dev); | |
776 | return; | |
777 | } else { | |
778 | /* Malloc up new buffer. The "-4" omits the FCS (CRC). */ | |
779 | int pkt_len = (rx_head.rx_count & 0x7ff) - 4; | |
780 | struct sk_buff *skb; | |
781 | ||
dae2e9f4 | 782 | skb = netdev_alloc_skb(dev, pkt_len + 2); |
1da177e4 | 783 | if (skb == NULL) { |
09f75cd7 | 784 | dev->stats.rx_dropped++; |
1da177e4 LT |
785 | goto done; |
786 | } | |
1da177e4 LT |
787 | |
788 | skb_reserve(skb, 2); /* Align IP on 16 byte boundaries */ | |
789 | read_block(ioaddr, pkt_len, skb_put(skb,pkt_len), dev->if_port); | |
790 | skb->protocol = eth_type_trans(skb, dev); | |
791 | netif_rx(skb); | |
09f75cd7 JG |
792 | dev->stats.rx_packets++; |
793 | dev->stats.rx_bytes += pkt_len; | |
1da177e4 LT |
794 | } |
795 | done: | |
796 | write_reg(ioaddr, CMR1, CMR1_NextPkt); | |
797 | lp->last_rx_time = jiffies; | |
1da177e4 LT |
798 | } |
799 | ||
800 | static void read_block(long ioaddr, int length, unsigned char *p, int data_mode) | |
801 | { | |
1da177e4 LT |
802 | if (data_mode <= 3) { /* Mode 0 or 1 */ |
803 | outb(Ctrl_LNibRead, ioaddr + PAR_CONTROL); | |
804 | outb(length == 8 ? RdAddr | HNib | MAR : RdAddr | MAR, | |
805 | ioaddr + PAR_DATA); | |
806 | if (data_mode <= 1) { /* Mode 0 or 1 */ | |
e4c3c13c HE |
807 | do { *p++ = read_byte_mode0(ioaddr); } while (--length > 0); |
808 | } else { /* Mode 2 or 3 */ | |
809 | do { *p++ = read_byte_mode2(ioaddr); } while (--length > 0); | |
810 | } | |
811 | } else if (data_mode <= 5) { | |
812 | do { *p++ = read_byte_mode4(ioaddr); } while (--length > 0); | |
813 | } else { | |
814 | do { *p++ = read_byte_mode6(ioaddr); } while (--length > 0); | |
815 | } | |
1da177e4 | 816 | |
e4c3c13c | 817 | outb(EOC+HNib+MAR, ioaddr + PAR_DATA); |
1da177e4 LT |
818 | outb(Ctrl_SelData, ioaddr + PAR_CONTROL); |
819 | } | |
820 | ||
821 | /* The inverse routine to net_open(). */ | |
822 | static int | |
823 | net_close(struct net_device *dev) | |
824 | { | |
825 | struct net_local *lp = netdev_priv(dev); | |
826 | long ioaddr = dev->base_addr; | |
827 | ||
828 | netif_stop_queue(dev); | |
829 | ||
830 | del_timer_sync(&lp->timer); | |
831 | ||
832 | /* Flush the Tx and disable Rx here. */ | |
833 | lp->addr_mode = CMR2h_OFF; | |
834 | write_reg_high(ioaddr, CMR2, CMR2h_OFF); | |
835 | ||
836 | /* Free the IRQ line. */ | |
837 | outb(0x00, ioaddr + PAR_CONTROL); | |
838 | free_irq(dev->irq, dev); | |
839 | ||
840 | /* Reset the ethernet hardware and activate the printer pass-through. */ | |
841 | write_reg_high(ioaddr, CMR1, CMR1h_RESET | CMR1h_MUX); | |
842 | return 0; | |
843 | } | |
844 | ||
1da177e4 LT |
845 | /* |
846 | * Set or clear the multicast filter for this adapter. | |
847 | */ | |
848 | ||
bb263e18 | 849 | static void set_rx_mode(struct net_device *dev) |
1da177e4 LT |
850 | { |
851 | struct net_local *lp = netdev_priv(dev); | |
852 | long ioaddr = dev->base_addr; | |
853 | ||
4cd24eaf | 854 | if (!netdev_mc_empty(dev) || (dev->flags & (IFF_ALLMULTI|IFF_PROMISC))) |
1da177e4 | 855 | lp->addr_mode = CMR2h_PROMISC; |
c16d1185 | 856 | else |
1da177e4 LT |
857 | lp->addr_mode = CMR2h_Normal; |
858 | write_reg_high(ioaddr, CMR2, lp->addr_mode); | |
859 | } | |
860 | ||
1da177e4 LT |
861 | static int __init atp_init_module(void) { |
862 | if (debug) /* Emit version even if no cards detected. */ | |
2c2a8c53 | 863 | printk(KERN_INFO "%s", version); |
1da177e4 LT |
864 | return atp_init(); |
865 | } | |
866 | ||
867 | static void __exit atp_cleanup_module(void) { | |
868 | struct net_device *next_dev; | |
869 | ||
870 | while (root_atp_dev) { | |
454d7c9b WC |
871 | struct net_local *atp_local = netdev_priv(root_atp_dev); |
872 | next_dev = atp_local->next_module; | |
1da177e4 LT |
873 | unregister_netdev(root_atp_dev); |
874 | /* No need to release_region(), since we never snarf it. */ | |
875 | free_netdev(root_atp_dev); | |
876 | root_atp_dev = next_dev; | |
877 | } | |
878 | } | |
879 | ||
880 | module_init(atp_init_module); | |
881 | module_exit(atp_cleanup_module); |