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Save sram context after changing MPU, DSP or core clocks
[linux-ginger.git] / drivers / net / hp-plus.c
blob0486cbe01adbc6195dcd8c4d186227f0cc4406d8
1 /* hp-plus.c: A HP PCLAN/plus ethernet driver for linux. */
2 /*
3 Written 1994 by Donald Becker.
4
5 This driver is for the Hewlett Packard PC LAN (27***) plus ethercards.
6 These cards are sold under several model numbers, usually 2724*.
7
8 This software may be used and distributed according to the terms
9 of the GNU General Public License, incorporated herein by reference.
10
11 The author may be reached as becker@scyld.com, or C/O
12 Scyld Computing Corporation
13 410 Severn Ave., Suite 210
14 Annapolis MD 21403
15
16 As is often the case, a great deal of credit is owed to Russ Nelson.
17 The Crynwr packet driver was my primary source of HP-specific
18 programming information.
19 */
20
21 static const char version[] =
22 "hp-plus.c:v1.10 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
23
24 #include <linux/module.h>
25
26 #include <linux/string.h> /* Important -- this inlines word moves. */
27 #include <linux/kernel.h>
28 #include <linux/errno.h>
29 #include <linux/ioport.h>
30 #include <linux/netdevice.h>
31 #include <linux/etherdevice.h>
32 #include <linux/init.h>
33 #include <linux/delay.h>
34
35 #include <asm/system.h>
36 #include <asm/io.h>
37
38 #include "8390.h"
39
40 #define DRV_NAME "hp-plus"
41
42 /* A zero-terminated list of I/O addresses to be probed. */
43 static unsigned int hpplus_portlist[] __initdata =
44 {0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0};
45
46 /*
47 The HP EtherTwist chip implementation is a fairly routine DP8390
48 implementation. It allows both shared memory and programmed-I/O buffer
49 access, using a custom interface for both. The programmed-I/O mode is
50 entirely implemented in the HP EtherTwist chip, bypassing the problem
51 ridden built-in 8390 facilities used on NE2000 designs. The shared
52 memory mode is likewise special, with an offset register used to make
53 packets appear at the shared memory base. Both modes use a base and bounds
54 page register to hide the Rx ring buffer wrap -- a packet that spans the
55 end of physical buffer memory appears continuous to the driver. (c.f. the
56 3c503 and Cabletron E2100)
57
58 A special note: the internal buffer of the board is only 8 bits wide.
59 This lays several nasty traps for the unaware:
60 - the 8390 must be programmed for byte-wide operations
61 - all I/O and memory operations must work on whole words (the access
62 latches are serially preloaded and have no byte-swapping ability).
63
64 This board is laid out in I/O space much like the earlier HP boards:
65 the first 16 locations are for the board registers, and the second 16 are
66 for the 8390. The board is easy to identify, with both a dedicated 16 bit
67 ID register and a constant 0x530* value in the upper bits of the paging
68 register.
69 */
70
71 #define HP_ID 0x00 /* ID register, always 0x4850. */
72 #define HP_PAGING 0x02 /* Registers visible @ 8-f, see PageName. */
73 #define HPP_OPTION 0x04 /* Bitmapped options, see HP_Option. */
74 #define HPP_OUT_ADDR 0x08 /* I/O output location in Perf_Page. */
75 #define HPP_IN_ADDR 0x0A /* I/O input location in Perf_Page. */
76 #define HP_DATAPORT 0x0c /* I/O data transfer in Perf_Page. */
77 #define NIC_OFFSET 0x10 /* Offset to the 8390 registers. */
78 #define HP_IO_EXTENT 32
79
80 #define HP_START_PG 0x00 /* First page of TX buffer */
81 #define HP_STOP_PG 0x80 /* Last page +1 of RX ring */
82
83 /* The register set selected in HP_PAGING. */
84 enum PageName {
85 Perf_Page = 0, /* Normal operation. */
86 MAC_Page = 1, /* The ethernet address (+checksum). */
87 HW_Page = 2, /* EEPROM-loaded hardware parameters. */
88 LAN_Page = 4, /* Transceiver selection, testing, etc. */
89 ID_Page = 6 };
90
91 /* The bit definitions for the HPP_OPTION register. */
92 enum HP_Option {
93 NICReset = 1, ChipReset = 2, /* Active low, really UNreset. */
94 EnableIRQ = 4, FakeIntr = 8, BootROMEnb = 0x10, IOEnb = 0x20,
95 MemEnable = 0x40, ZeroWait = 0x80, MemDisable = 0x1000, };
96
97 static int hpp_probe1(struct net_device *dev, int ioaddr);
98
99 static void hpp_reset_8390(struct net_device *dev);
100 static int hpp_open(struct net_device *dev);
101 static int hpp_close(struct net_device *dev);
102 static void hpp_mem_block_input(struct net_device *dev, int count,
103 struct sk_buff *skb, int ring_offset);
104 static void hpp_mem_block_output(struct net_device *dev, int count,
105 const unsigned char *buf, int start_page);
106 static void hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
107 int ring_page);
108 static void hpp_io_block_input(struct net_device *dev, int count,
109 struct sk_buff *skb, int ring_offset);
110 static void hpp_io_block_output(struct net_device *dev, int count,
111 const unsigned char *buf, int start_page);
112 static void hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
113 int ring_page);
114
115
116 /* Probe a list of addresses for an HP LAN+ adaptor.
117 This routine is almost boilerplate. */
118
119 static int __init do_hpp_probe(struct net_device *dev)
120 {
121 int i;
122 int base_addr = dev->base_addr;
123 int irq = dev->irq;
124
125 if (base_addr > 0x1ff) /* Check a single specified location. */
126 return hpp_probe1(dev, base_addr);
127 else if (base_addr != 0) /* Don't probe at all. */
128 return -ENXIO;
129
130 for (i = 0; hpplus_portlist[i]; i++) {
131 if (hpp_probe1(dev, hpplus_portlist[i]) == 0)
132 return 0;
133 dev->irq = irq;
134 }
135
136 return -ENODEV;
137 }
138
139 #ifndef MODULE
140 struct net_device * __init hp_plus_probe(int unit)
141 {
142 struct net_device *dev = alloc_eip_netdev();
143 int err;
144
145 if (!dev)
146 return ERR_PTR(-ENOMEM);
147
148 sprintf(dev->name, "eth%d", unit);
149 netdev_boot_setup_check(dev);
150
151 err = do_hpp_probe(dev);
152 if (err)
153 goto out;
154 return dev;
155 out:
156 free_netdev(dev);
157 return ERR_PTR(err);
158 }
159 #endif
160
161 static const struct net_device_ops hpp_netdev_ops = {
162 .ndo_open = hpp_open,
163 .ndo_stop = hpp_close,
164 .ndo_start_xmit = eip_start_xmit,
165 .ndo_tx_timeout = eip_tx_timeout,
166 .ndo_get_stats = eip_get_stats,
167 .ndo_set_multicast_list = eip_set_multicast_list,
168 .ndo_validate_addr = eth_validate_addr,
169 .ndo_set_mac_address = eth_mac_addr,
170 .ndo_change_mtu = eth_change_mtu,
171 #ifdef CONFIG_NET_POLL_CONTROLLER
172 .ndo_poll_controller = eip_poll,
173 #endif
174 };
175
176
177 /* Do the interesting part of the probe at a single address. */
178 static int __init hpp_probe1(struct net_device *dev, int ioaddr)
179 {
180 int i, retval;
181 unsigned char checksum = 0;
182 const char name[] = "HP-PC-LAN+";
183 int mem_start;
184 static unsigned version_printed;
185
186 if (!request_region(ioaddr, HP_IO_EXTENT, DRV_NAME))
187 return -EBUSY;
188
189 /* Check for the HP+ signature, 50 48 0x 53. */
190 if (inw(ioaddr + HP_ID) != 0x4850
191 || (inw(ioaddr + HP_PAGING) & 0xfff0) != 0x5300) {
192 retval = -ENODEV;
193 goto out;
194 }
195
196 if (ei_debug && version_printed++ == 0)
197 printk(version);
198
199 printk("%s: %s at %#3x, ", dev->name, name, ioaddr);
200
201 /* Retrieve and checksum the station address. */
202 outw(MAC_Page, ioaddr + HP_PAGING);
203
204 for(i = 0; i < ETHER_ADDR_LEN; i++) {
205 unsigned char inval = inb(ioaddr + 8 + i);
206 dev->dev_addr[i] = inval;
207 checksum += inval;
208 }
209 checksum += inb(ioaddr + 14);
210
211 printk("%pM", dev->dev_addr);
212
213 if (checksum != 0xff) {
214 printk(" bad checksum %2.2x.\n", checksum);
215 retval = -ENODEV;
216 goto out;
217 } else {
218 /* Point at the Software Configuration Flags. */
219 outw(ID_Page, ioaddr + HP_PAGING);
220 printk(" ID %4.4x", inw(ioaddr + 12));
221 }
222
223 /* Read the IRQ line. */
224 outw(HW_Page, ioaddr + HP_PAGING);
225 {
226 int irq = inb(ioaddr + 13) & 0x0f;
227 int option = inw(ioaddr + HPP_OPTION);
228
229 dev->irq = irq;
230 if (option & MemEnable) {
231 mem_start = inw(ioaddr + 9) << 8;
232 printk(", IRQ %d, memory address %#x.\n", irq, mem_start);
233 } else {
234 mem_start = 0;
235 printk(", IRQ %d, programmed-I/O mode.\n", irq);
236 }
237 }
238
239 /* Set the wrap registers for string I/O reads. */
240 outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
241
242 /* Set the base address to point to the NIC, not the "real" base! */
243 dev->base_addr = ioaddr + NIC_OFFSET;
244
245 dev->netdev_ops = &hpp_netdev_ops;
246
247 ei_status.name = name;
248 ei_status.word16 = 0; /* Agggghhhhh! Debug time: 2 days! */
249 ei_status.tx_start_page = HP_START_PG;
250 ei_status.rx_start_page = HP_START_PG + TX_PAGES/2;
251 ei_status.stop_page = HP_STOP_PG;
252
253 ei_status.reset_8390 = &hpp_reset_8390;
254 ei_status.block_input = &hpp_io_block_input;
255 ei_status.block_output = &hpp_io_block_output;
256 ei_status.get_8390_hdr = &hpp_io_get_8390_hdr;
257
258 /* Check if the memory_enable flag is set in the option register. */
259 if (mem_start) {
260 ei_status.block_input = &hpp_mem_block_input;
261 ei_status.block_output = &hpp_mem_block_output;
262 ei_status.get_8390_hdr = &hpp_mem_get_8390_hdr;
263 dev->mem_start = mem_start;
264 ei_status.mem = ioremap(mem_start,
265 (HP_STOP_PG - HP_START_PG)*256);
266 if (!ei_status.mem) {
267 retval = -ENOMEM;
268 goto out;
269 }
270 ei_status.rmem_start = dev->mem_start + TX_PAGES/2*256;
271 dev->mem_end = ei_status.rmem_end
272 = dev->mem_start + (HP_STOP_PG - HP_START_PG)*256;
273 }
274
275 outw(Perf_Page, ioaddr + HP_PAGING);
276 NS8390p_init(dev, 0);
277 /* Leave the 8390 and HP chip reset. */
278 outw(inw(ioaddr + HPP_OPTION) & ~EnableIRQ, ioaddr + HPP_OPTION);
279
280 retval = register_netdev(dev);
281 if (retval)
282 goto out1;
283 return 0;
284 out1:
285 iounmap(ei_status.mem);
286 out:
287 release_region(ioaddr, HP_IO_EXTENT);
288 return retval;
289 }
290
291 static int
292 hpp_open(struct net_device *dev)
293 {
294 int ioaddr = dev->base_addr - NIC_OFFSET;
295 int option_reg;
296 int retval;
297
298 if ((retval = request_irq(dev->irq, eip_interrupt, 0, dev->name, dev))) {
299 return retval;
300 }
301
302 /* Reset the 8390 and HP chip. */
303 option_reg = inw(ioaddr + HPP_OPTION);
304 outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
305 udelay(5);
306 /* Unreset the board and enable interrupts. */
307 outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
308
309 /* Set the wrap registers for programmed-I/O operation. */
310 outw(HW_Page, ioaddr + HP_PAGING);
311 outw((HP_START_PG + TX_PAGES/2) | ((HP_STOP_PG - 1) << 8), ioaddr + 14);
312
313 /* Select the operational page. */
314 outw(Perf_Page, ioaddr + HP_PAGING);
315
316 return eip_open(dev);
317 }
318
319 static int
320 hpp_close(struct net_device *dev)
321 {
322 int ioaddr = dev->base_addr - NIC_OFFSET;
323 int option_reg = inw(ioaddr + HPP_OPTION);
324
325 free_irq(dev->irq, dev);
326 eip_close(dev);
327 outw((option_reg & ~EnableIRQ) | MemDisable | NICReset | ChipReset,
328 ioaddr + HPP_OPTION);
329
330 return 0;
331 }
332
333 static void
334 hpp_reset_8390(struct net_device *dev)
335 {
336 int ioaddr = dev->base_addr - NIC_OFFSET;
337 int option_reg = inw(ioaddr + HPP_OPTION);
338
339 if (ei_debug > 1) printk("resetting the 8390 time=%ld...", jiffies);
340
341 outw(option_reg & ~(NICReset + ChipReset), ioaddr + HPP_OPTION);
342 /* Pause a few cycles for the hardware reset to take place. */
343 udelay(5);
344 ei_status.txing = 0;
345 outw(option_reg | (EnableIRQ + NICReset + ChipReset), ioaddr + HPP_OPTION);
346
347 udelay(5);
348
349
350 if ((inb_p(ioaddr+NIC_OFFSET+EN0_ISR) & ENISR_RESET) == 0)
351 printk("%s: hp_reset_8390() did not complete.\n", dev->name);
352
353 if (ei_debug > 1) printk("8390 reset done (%ld).", jiffies);
354 return;
355 }
356
357 /* The programmed-I/O version of reading the 4 byte 8390 specific header.
358 Note that transfer with the EtherTwist+ must be on word boundaries. */
359
360 static void
361 hpp_io_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
362 {
363 int ioaddr = dev->base_addr - NIC_OFFSET;
364
365 outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
366 insw(ioaddr + HP_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
367 }
368
369 /* Block input and output, similar to the Crynwr packet driver. */
370
371 static void
372 hpp_io_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
373 {
374 int ioaddr = dev->base_addr - NIC_OFFSET;
375 char *buf = skb->data;
376
377 outw(ring_offset, ioaddr + HPP_IN_ADDR);
378 insw(ioaddr + HP_DATAPORT, buf, count>>1);
379 if (count & 0x01)
380 buf[count-1] = inw(ioaddr + HP_DATAPORT);
381 }
382
383 /* The corresponding shared memory versions of the above 2 functions. */
384
385 static void
386 hpp_mem_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
387 {
388 int ioaddr = dev->base_addr - NIC_OFFSET;
389 int option_reg = inw(ioaddr + HPP_OPTION);
390
391 outw((ring_page<<8), ioaddr + HPP_IN_ADDR);
392 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
393 memcpy_fromio(hdr, ei_status.mem, sizeof(struct e8390_pkt_hdr));
394 outw(option_reg, ioaddr + HPP_OPTION);
395 hdr->count = (le16_to_cpu(hdr->count) + 3) & ~3; /* Round up allocation. */
396 }
397
398 static void
399 hpp_mem_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
400 {
401 int ioaddr = dev->base_addr - NIC_OFFSET;
402 int option_reg = inw(ioaddr + HPP_OPTION);
403
404 outw(ring_offset, ioaddr + HPP_IN_ADDR);
405
406 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
407
408 /* Caution: this relies on get_8390_hdr() rounding up count!
409 Also note that we *can't* use eth_io_copy_and_sum() because
410 it will not always copy "count" bytes (e.g. padded IP). */
411
412 memcpy_fromio(skb->data, ei_status.mem, count);
413 outw(option_reg, ioaddr + HPP_OPTION);
414 }
415
416 /* A special note: we *must* always transfer >=16 bit words.
417 It's always safe to round up, so we do. */
418 static void
419 hpp_io_block_output(struct net_device *dev, int count,
420 const unsigned char *buf, int start_page)
421 {
422 int ioaddr = dev->base_addr - NIC_OFFSET;
423 outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
424 outsl(ioaddr + HP_DATAPORT, buf, (count+3)>>2);
425 return;
426 }
427
428 static void
429 hpp_mem_block_output(struct net_device *dev, int count,
430 const unsigned char *buf, int start_page)
431 {
432 int ioaddr = dev->base_addr - NIC_OFFSET;
433 int option_reg = inw(ioaddr + HPP_OPTION);
434
435 outw(start_page << 8, ioaddr + HPP_OUT_ADDR);
436 outw(option_reg & ~(MemDisable + BootROMEnb), ioaddr + HPP_OPTION);
437 memcpy_toio(ei_status.mem, buf, (count + 3) & ~3);
438 outw(option_reg, ioaddr + HPP_OPTION);
439
440 return;
441 }
442
443
444 #ifdef MODULE
445 #define MAX_HPP_CARDS 4 /* Max number of HPP cards per module */
446 static struct net_device *dev_hpp[MAX_HPP_CARDS];
447 static int io[MAX_HPP_CARDS];
448 static int irq[MAX_HPP_CARDS];
449
450 module_param_array(io, int, NULL, 0);
451 module_param_array(irq, int, NULL, 0);
452 MODULE_PARM_DESC(io, "I/O port address(es)");
453 MODULE_PARM_DESC(irq, "IRQ number(s); ignored if properly detected");
454 MODULE_DESCRIPTION("HP PC-LAN+ ISA ethernet driver");
455 MODULE_LICENSE("GPL");
456
457 /* This is set up so that only a single autoprobe takes place per call.
458 ISA device autoprobes on a running machine are not recommended. */
459 int __init
460 init_module(void)
461 {
462 struct net_device *dev;
463 int this_dev, found = 0;
464
465 for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
466 if (io[this_dev] == 0) {
467 if (this_dev != 0) break; /* only autoprobe 1st one */
468 printk(KERN_NOTICE "hp-plus.c: Presently autoprobing (not recommended) for a single card.\n");
469 }
470 dev = alloc_eip_netdev();
471 if (!dev)
472 break;
473 dev->irq = irq[this_dev];
474 dev->base_addr = io[this_dev];
475 if (do_hpp_probe(dev) == 0) {
476 dev_hpp[found++] = dev;
477 continue;
478 }
479 free_netdev(dev);
480 printk(KERN_WARNING "hp-plus.c: No HP-Plus card found (i/o = 0x%x).\n", io[this_dev]);
481 break;
482 }
483 if (found)
484 return 0;
485 return -ENXIO;
486 }
487
488 static void cleanup_card(struct net_device *dev)
489 {
490 /* NB: hpp_close() handles free_irq */
491 iounmap(ei_status.mem);
492 release_region(dev->base_addr - NIC_OFFSET, HP_IO_EXTENT);
493 }
494
495 void __exit
496 cleanup_module(void)
497 {
498 int this_dev;
499
500 for (this_dev = 0; this_dev < MAX_HPP_CARDS; this_dev++) {
501 struct net_device *dev = dev_hpp[this_dev];
502 if (dev) {
503 unregister_netdev(dev);
504 cleanup_card(dev);
505 free_netdev(dev);
506 }
507 }
508 }
509 #endif /* MODULE */
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