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Linux/drivers/net/ethernet/8390/ne.c

  1 /* ne.c: A general non-shared-memory NS8390 ethernet driver for linux. */
  2 /*
  3     Written 1992-94 by Donald Becker.
  4 
  5     Copyright 1993 United States Government as represented by the
  6     Director, National Security Agency.
  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, 410 Severn Ave., Suite 210, Annapolis MD 21403
 13 
 14     This driver should work with many programmed-I/O 8390-based ethernet
 15     boards.  Currently it supports the NE1000, NE2000, many clones,
 16     and some Cabletron products.
 17 
 18     Changelog:
 19 
 20     Paul Gortmaker      : use ENISR_RDC to monitor Tx PIO uploads, made
 21                           sanity checks and bad clone support optional.
 22     Paul Gortmaker      : new reset code, reset card after probe at boot.
 23     Paul Gortmaker      : multiple card support for module users.
 24     Paul Gortmaker      : Support for PCI ne2k clones, similar to lance.c
 25     Paul Gortmaker      : Allow users with bad cards to avoid full probe.
 26     Paul Gortmaker      : PCI probe changes, more PCI cards supported.
 27     rjohnson@analogic.com : Changed init order so an interrupt will only
 28     occur after memory is allocated for dev->priv. Deallocated memory
 29     last in cleanup_modue()
 30     Richard Guenther    : Added support for ISAPnP cards
 31     Paul Gortmaker      : Discontinued PCI support - use ne2k-pci.c instead.
 32     Hayato Fujiwara     : Add m32r support.
 33 
 34 */
 35 
 36 /* Routines for the NatSemi-based designs (NE[12]000). */
 37 
 38 static const char version1[] =
 39 "ne.c:v1.10 9/23/94 Donald Becker (becker@scyld.com)\n";
 40 static const char version2[] =
 41 "Last modified Nov 1, 2000 by Paul Gortmaker\n";
 42 
 43 
 44 #include <linux/module.h>
 45 #include <linux/kernel.h>
 46 #include <linux/errno.h>
 47 #include <linux/isapnp.h>
 48 #include <linux/init.h>
 49 #include <linux/interrupt.h>
 50 #include <linux/delay.h>
 51 #include <linux/netdevice.h>
 52 #include <linux/etherdevice.h>
 53 #include <linux/jiffies.h>
 54 #include <linux/platform_device.h>
 55 
 56 #include <asm/io.h>
 57 
 58 #include "8390.h"
 59 
 60 #define DRV_NAME "ne"
 61 
 62 /* Some defines that people can play with if so inclined. */
 63 
 64 /* Do we support clones that don't adhere to 14,15 of the SAprom ? */
 65 #define SUPPORT_NE_BAD_CLONES
 66 /* 0xbad = bad sig or no reset ack */
 67 #define BAD 0xbad
 68 
 69 #define MAX_NE_CARDS    4       /* Max number of NE cards per module */
 70 static struct platform_device *pdev_ne[MAX_NE_CARDS];
 71 static int io[MAX_NE_CARDS];
 72 static int irq[MAX_NE_CARDS];
 73 static int bad[MAX_NE_CARDS];
 74 static u32 ne_msg_enable;
 75 
 76 #ifdef MODULE
 77 module_param_array(io, int, NULL, 0);
 78 module_param_array(irq, int, NULL, 0);
 79 module_param_array(bad, int, NULL, 0);
 80 module_param_named(msg_enable, ne_msg_enable, uint, (S_IRUSR|S_IRGRP|S_IROTH));
 81 MODULE_PARM_DESC(io, "I/O base address(es),required");
 82 MODULE_PARM_DESC(irq, "IRQ number(s)");
 83 MODULE_PARM_DESC(bad, "Accept card(s) with bad signatures");
 84 MODULE_PARM_DESC(msg_enable, "Debug message level (see linux/netdevice.h for bitmap)");
 85 MODULE_DESCRIPTION("NE1000/NE2000 ISA/PnP Ethernet driver");
 86 MODULE_LICENSE("GPL");
 87 #endif /* MODULE */
 88 
 89 /* Do we perform extra sanity checks on stuff ? */
 90 /* #define NE_SANITY_CHECK */
 91 
 92 /* Do we implement the read before write bugfix ? */
 93 /* #define NE_RW_BUGFIX */
 94 
 95 /* Do we have a non std. amount of memory? (in units of 256 byte pages) */
 96 /* #define PACKETBUF_MEMSIZE    0x40 */
 97 
 98 /* This is set up so that no ISA autoprobe takes place. We can't guarantee
 99 that the ne2k probe is the last 8390 based probe to take place (as it
100 is at boot) and so the probe will get confused by any other 8390 cards.
101 ISA device autoprobes on a running machine are not recommended anyway. */
102 #if !defined(MODULE) && (defined(CONFIG_ISA) || defined(CONFIG_M32R))
103 /* Do we need a portlist for the ISA auto-probe ? */
104 #define NEEDS_PORTLIST
105 #endif
106 
107 /* A zero-terminated list of I/O addresses to be probed at boot. */
108 #ifdef NEEDS_PORTLIST
109 static unsigned int netcard_portlist[] __initdata = {
110         0x300, 0x280, 0x320, 0x340, 0x360, 0x380, 0
111 };
112 #endif
113 
114 static struct isapnp_device_id isapnp_clone_list[] __initdata = {
115         {       ISAPNP_CARD_ID('A','X','E',0x2011),
116                 ISAPNP_VENDOR('A','X','E'), ISAPNP_FUNCTION(0x2011),
117                 (long) "NetGear EA201" },
118         {       ISAPNP_ANY_ID, ISAPNP_ANY_ID,
119                 ISAPNP_VENDOR('E','D','I'), ISAPNP_FUNCTION(0x0216),
120                 (long) "NN NE2000" },
121         {       ISAPNP_ANY_ID, ISAPNP_ANY_ID,
122                 ISAPNP_VENDOR('P','N','P'), ISAPNP_FUNCTION(0x80d6),
123                 (long) "Generic PNP" },
124         { }     /* terminate list */
125 };
126 
127 MODULE_DEVICE_TABLE(isapnp, isapnp_clone_list);
128 
129 #ifdef SUPPORT_NE_BAD_CLONES
130 /* A list of bad clones that we none-the-less recognize. */
131 static struct { const char *name8, *name16; unsigned char SAprefix[4];}
132 bad_clone_list[] __initdata = {
133     {"DE100", "DE200", {0x00, 0xDE, 0x01,}},
134     {"DE120", "DE220", {0x00, 0x80, 0xc8,}},
135     {"DFI1000", "DFI2000", {'D', 'F', 'I',}}, /* Original, eh?  */
136     {"EtherNext UTP8", "EtherNext UTP16", {0x00, 0x00, 0x79}},
137     {"NE1000","NE2000-invalid", {0x00, 0x00, 0xd8}}, /* Ancient real NE1000. */
138     {"NN1000", "NN2000",  {0x08, 0x03, 0x08}}, /* Outlaw no-name clone. */
139     {"4-DIM8","4-DIM16", {0x00,0x00,0x4d,}},  /* Outlaw 4-Dimension cards. */
140     {"Con-Intl_8", "Con-Intl_16", {0x00, 0x00, 0x24}}, /* Connect Int'nl */
141     {"ET-100","ET-200", {0x00, 0x45, 0x54}}, /* YANG and YA clone */
142     {"COMPEX","COMPEX16",{0x00,0x80,0x48}}, /* Broken ISA Compex cards */
143     {"E-LAN100", "E-LAN200", {0x00, 0x00, 0x5d}}, /* Broken ne1000 clones */
144     {"PCM-4823", "PCM-4823", {0x00, 0xc0, 0x6c}}, /* Broken Advantech MoBo */
145     {"REALTEK", "RTL8019", {0x00, 0x00, 0xe8}}, /* no-name with Realtek chip */
146 #ifdef CONFIG_MACH_TX49XX
147     {"RBHMA4X00-RTL8019", "RBHMA4X00-RTL8019", {0x00, 0x60, 0x0a}},  /* Toshiba built-in */
148 #endif
149     {"LCS-8834", "LCS-8836", {0x04, 0x04, 0x37}}, /* ShinyNet (SET) */
150     {NULL,}
151 };
152 #endif
153 
154 /* ---- No user-serviceable parts below ---- */
155 
156 #define NE_BASE  (dev->base_addr)
157 #define NE_CMD          0x00
158 #define NE_DATAPORT     0x10    /* NatSemi-defined port window offset. */
159 #define NE_RESET        0x1f    /* Issue a read to reset, a write to clear. */
160 #define NE_IO_EXTENT    0x20
161 
162 #define NE1SM_START_PG  0x20    /* First page of TX buffer */
163 #define NE1SM_STOP_PG   0x40    /* Last page +1 of RX ring */
164 #define NESM_START_PG   0x40    /* First page of TX buffer */
165 #define NESM_STOP_PG    0x80    /* Last page +1 of RX ring */
166 
167 #if defined(CONFIG_PLAT_MAPPI)
168 #  define DCR_VAL 0x4b
169 #elif defined(CONFIG_PLAT_OAKS32R)  || \
170    defined(CONFIG_MACH_TX49XX)
171 #  define DCR_VAL 0x48          /* 8-bit mode */
172 #else
173 #  define DCR_VAL 0x49
174 #endif
175 
176 static int ne_probe1(struct net_device *dev, unsigned long ioaddr);
177 static int ne_probe_isapnp(struct net_device *dev);
178 
179 static void ne_reset_8390(struct net_device *dev);
180 static void ne_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr,
181                           int ring_page);
182 static void ne_block_input(struct net_device *dev, int count,
183                           struct sk_buff *skb, int ring_offset);
184 static void ne_block_output(struct net_device *dev, const int count,
185                 const unsigned char *buf, const int start_page);
186 
187 
188 /*  Probe for various non-shared-memory ethercards.
189 
190    NEx000-clone boards have a Station Address PROM (SAPROM) in the packet
191    buffer memory space.  NE2000 clones have 0x57,0x57 in bytes 0x0e,0x0f of
192    the SAPROM, while other supposed NE2000 clones must be detected by their
193    SA prefix.
194 
195    Reading the SAPROM from a word-wide card with the 8390 set in byte-wide
196    mode results in doubled values, which can be detected and compensated for.
197 
198    The probe is also responsible for initializing the card and filling
199    in the 'dev' and 'ei_status' structures.
200 
201    We use the minimum memory size for some ethercard product lines, iff we can't
202    distinguish models.  You can increase the packet buffer size by setting
203    PACKETBUF_MEMSIZE.  Reported Cabletron packet buffer locations are:
204         E1010   starts at 0x100 and ends at 0x2000.
205         E1010-x starts at 0x100 and ends at 0x8000. ("-x" means "more memory")
206         E2010    starts at 0x100 and ends at 0x4000.
207         E2010-x starts at 0x100 and ends at 0xffff.  */
208 
209 static int __init do_ne_probe(struct net_device *dev)
210 {
211         unsigned long base_addr = dev->base_addr;
212 #ifdef NEEDS_PORTLIST
213         int orig_irq = dev->irq;
214 #endif
215 
216         /* First check any supplied i/o locations. User knows best. <cough> */
217         if (base_addr > 0x1ff) {        /* Check a single specified location. */
218                 int ret = ne_probe1(dev, base_addr);
219                 if (ret)
220                         netdev_warn(dev, "ne.c: No NE*000 card found at "
221                                     "i/o = %#lx\n", base_addr);
222                 return ret;
223         }
224         else if (base_addr != 0)        /* Don't probe at all. */
225                 return -ENXIO;
226 
227         /* Then look for any installed ISAPnP clones */
228         if (isapnp_present() && (ne_probe_isapnp(dev) == 0))
229                 return 0;
230 
231 #ifdef NEEDS_PORTLIST
232         /* Last resort. The semi-risky ISA auto-probe. */
233         for (base_addr = 0; netcard_portlist[base_addr] != 0; base_addr++) {
234                 int ioaddr = netcard_portlist[base_addr];
235                 dev->irq = orig_irq;
236                 if (ne_probe1(dev, ioaddr) == 0)
237                         return 0;
238         }
239 #endif
240 
241         return -ENODEV;
242 }
243 
244 static int __init ne_probe_isapnp(struct net_device *dev)
245 {
246         int i;
247 
248         for (i = 0; isapnp_clone_list[i].vendor != 0; i++) {
249                 struct pnp_dev *idev = NULL;
250 
251                 while ((idev = pnp_find_dev(NULL,
252                                             isapnp_clone_list[i].vendor,
253                                             isapnp_clone_list[i].function,
254                                             idev))) {
255                         /* Avoid already found cards from previous calls */
256                         if (pnp_device_attach(idev) < 0)
257                                 continue;
258                         if (pnp_activate_dev(idev) < 0) {
259                                 pnp_device_detach(idev);
260                                 continue;
261                         }
262                         /* if no io and irq, search for next */
263                         if (!pnp_port_valid(idev, 0) || !pnp_irq_valid(idev, 0)) {
264                                 pnp_device_detach(idev);
265                                 continue;
266                         }
267                         /* found it */
268                         dev->base_addr = pnp_port_start(idev, 0);
269                         dev->irq = pnp_irq(idev, 0);
270                         netdev_info(dev,
271                                     "ne.c: ISAPnP reports %s at i/o %#lx, irq %d.\n",
272                                     (char *) isapnp_clone_list[i].driver_data,
273                                     dev->base_addr, dev->irq);
274                         if (ne_probe1(dev, dev->base_addr) != 0) {      /* Shouldn't happen. */
275                                 netdev_err(dev,
276                                            "ne.c: Probe of ISAPnP card at %#lx failed.\n",
277                                            dev->base_addr);
278                                 pnp_device_detach(idev);
279                                 return -ENXIO;
280                         }
281                         ei_status.priv = (unsigned long)idev;
282                         break;
283                 }
284                 if (!idev)
285                         continue;
286                 return 0;
287         }
288 
289         return -ENODEV;
290 }
291 
292 static int __init ne_probe1(struct net_device *dev, unsigned long ioaddr)
293 {
294         int i;
295         unsigned char SA_prom[32];
296         int wordlength = 2;
297         const char *name = NULL;
298         int start_page, stop_page;
299         int neX000, ctron, copam, bad_card;
300         int reg0, ret;
301         static unsigned version_printed;
302         struct ei_device *ei_local = netdev_priv(dev);
303 
304         if (!request_region(ioaddr, NE_IO_EXTENT, DRV_NAME))
305                 return -EBUSY;
306 
307         reg0 = inb_p(ioaddr);
308         if (reg0 == 0xFF) {
309                 ret = -ENODEV;
310                 goto err_out;
311         }
312 
313         /* Do a preliminary verification that we have a 8390. */
314         {
315                 int regd;
316                 outb_p(E8390_NODMA+E8390_PAGE1+E8390_STOP, ioaddr + E8390_CMD);
317                 regd = inb_p(ioaddr + 0x0d);
318                 outb_p(0xff, ioaddr + 0x0d);
319                 outb_p(E8390_NODMA+E8390_PAGE0, ioaddr + E8390_CMD);
320                 inb_p(ioaddr + EN0_COUNTER0); /* Clear the counter by reading. */
321                 if (inb_p(ioaddr + EN0_COUNTER0) != 0) {
322                         outb_p(reg0, ioaddr);
323                         outb_p(regd, ioaddr + 0x0d);    /* Restore the old values. */
324                         ret = -ENODEV;
325                         goto err_out;
326                 }
327         }
328 
329         if ((ne_msg_enable & NETIF_MSG_DRV) && (version_printed++ == 0))
330                 netdev_info(dev, "%s%s", version1, version2);
331 
332         netdev_info(dev, "NE*000 ethercard probe at %#3lx:", ioaddr);
333 
334         /* A user with a poor card that fails to ack the reset, or that
335            does not have a valid 0x57,0x57 signature can still use this
336            without having to recompile. Specifying an i/o address along
337            with an otherwise unused dev->mem_end value of "0xBAD" will
338            cause the driver to skip these parts of the probe. */
339 
340         bad_card = ((dev->base_addr != 0) && (dev->mem_end == BAD));
341 
342         /* Reset card. Who knows what dain-bramaged state it was left in. */
343 
344         {
345                 unsigned long reset_start_time = jiffies;
346 
347                 /* DON'T change these to inb_p/outb_p or reset will fail on clones. */
348                 outb(inb(ioaddr + NE_RESET), ioaddr + NE_RESET);
349 
350                 while ((inb_p(ioaddr + EN0_ISR) & ENISR_RESET) == 0)
351                 if (time_after(jiffies, reset_start_time + 2*HZ/100)) {
352                         if (bad_card) {
353                                 pr_cont(" (warning: no reset ack)");
354                                 break;
355                         } else {
356                                 pr_cont(" not found (no reset ack).\n");
357                                 ret = -ENODEV;
358                                 goto err_out;
359                         }
360                 }
361 
362                 outb_p(0xff, ioaddr + EN0_ISR);         /* Ack all intr. */
363         }
364 
365         /* Read the 16 bytes of station address PROM.
366            We must first initialize registers, similar to NS8390p_init(eifdev, 0).
367            We can't reliably read the SAPROM address without this.
368            (I learned the hard way!). */
369         {
370                 struct {unsigned char value, offset; } program_seq[] =
371                 {
372                         {E8390_NODMA+E8390_PAGE0+E8390_STOP, E8390_CMD}, /* Select page 0*/
373                         {0x48,  EN0_DCFG},      /* Set byte-wide (0x48) access. */
374                         {0x00,  EN0_RCNTLO},    /* Clear the count regs. */
375                         {0x00,  EN0_RCNTHI},
376                         {0x00,  EN0_IMR},       /* Mask completion irq. */
377                         {0xFF,  EN0_ISR},
378                         {E8390_RXOFF, EN0_RXCR},        /* 0x20  Set to monitor */
379                         {E8390_TXOFF, EN0_TXCR},        /* 0x02  and loopback mode. */
380                         {32,    EN0_RCNTLO},
381                         {0x00,  EN0_RCNTHI},
382                         {0x00,  EN0_RSARLO},    /* DMA starting at 0x0000. */
383                         {0x00,  EN0_RSARHI},
384                         {E8390_RREAD+E8390_START, E8390_CMD},
385                 };
386 
387                 for (i = 0; i < ARRAY_SIZE(program_seq); i++)
388                         outb_p(program_seq[i].value, ioaddr + program_seq[i].offset);
389 
390         }
391         for(i = 0; i < 32 /*sizeof(SA_prom)*/; i+=2) {
392                 SA_prom[i] = inb(ioaddr + NE_DATAPORT);
393                 SA_prom[i+1] = inb(ioaddr + NE_DATAPORT);
394                 if (SA_prom[i] != SA_prom[i+1])
395                         wordlength = 1;
396         }
397 
398         if (wordlength == 2)
399         {
400                 for (i = 0; i < 16; i++)
401                         SA_prom[i] = SA_prom[i+i];
402                 /* We must set the 8390 for word mode. */
403                 outb_p(DCR_VAL, ioaddr + EN0_DCFG);
404                 start_page = NESM_START_PG;
405 
406                 /*
407                  * Realtek RTL8019AS datasheet says that the PSTOP register
408                  * shouldn't exceed 0x60 in 8-bit mode.
409                  * This chip can be identified by reading the signature from
410                  * the  remote byte count registers (otherwise write-only)...
411                  */
412                 if ((DCR_VAL & 0x01) == 0 &&            /* 8-bit mode */
413                     inb(ioaddr + EN0_RCNTLO) == 0x50 &&
414                     inb(ioaddr + EN0_RCNTHI) == 0x70)
415                         stop_page = 0x60;
416                 else
417                         stop_page = NESM_STOP_PG;
418         } else {
419                 start_page = NE1SM_START_PG;
420                 stop_page  = NE1SM_STOP_PG;
421         }
422 
423 #if  defined(CONFIG_PLAT_MAPPI) || defined(CONFIG_PLAT_OAKS32R)
424         neX000 = ((SA_prom[14] == 0x57  &&  SA_prom[15] == 0x57)
425                 || (SA_prom[14] == 0x42 && SA_prom[15] == 0x42));
426 #else
427         neX000 = (SA_prom[14] == 0x57  &&  SA_prom[15] == 0x57);
428 #endif
429         ctron =  (SA_prom[0] == 0x00 && SA_prom[1] == 0x00 && SA_prom[2] == 0x1d);
430         copam =  (SA_prom[14] == 0x49 && SA_prom[15] == 0x00);
431 
432         /* Set up the rest of the parameters. */
433         if (neX000 || bad_card || copam) {
434                 name = (wordlength == 2) ? "NE2000" : "NE1000";
435         }
436         else if (ctron)
437         {
438                 name = (wordlength == 2) ? "Ctron-8" : "Ctron-16";
439                 start_page = 0x01;
440                 stop_page = (wordlength == 2) ? 0x40 : 0x20;
441         }
442         else
443         {
444 #ifdef SUPPORT_NE_BAD_CLONES
445                 /* Ack!  Well, there might be a *bad* NE*000 clone there.
446                    Check for total bogus addresses. */
447                 for (i = 0; bad_clone_list[i].name8; i++)
448                 {
449                         if (SA_prom[0] == bad_clone_list[i].SAprefix[0] &&
450                                 SA_prom[1] == bad_clone_list[i].SAprefix[1] &&
451                                 SA_prom[2] == bad_clone_list[i].SAprefix[2])
452                         {
453                                 if (wordlength == 2)
454                                 {
455                                         name = bad_clone_list[i].name16;
456                                 } else {
457                                         name = bad_clone_list[i].name8;
458                                 }
459                                 break;
460                         }
461                 }
462                 if (bad_clone_list[i].name8 == NULL)
463                 {
464                         pr_cont(" not found (invalid signature %2.2x %2.2x).\n",
465                                 SA_prom[14], SA_prom[15]);
466                         ret = -ENXIO;
467                         goto err_out;
468                 }
469 #else
470                 pr_cont(" not found.\n");
471                 ret = -ENXIO;
472                 goto err_out;
473 #endif
474         }
475 
476         if (dev->irq < 2)
477         {
478                 unsigned long cookie = probe_irq_on();
479                 outb_p(0x50, ioaddr + EN0_IMR); /* Enable one interrupt. */
480                 outb_p(0x00, ioaddr + EN0_RCNTLO);
481                 outb_p(0x00, ioaddr + EN0_RCNTHI);
482                 outb_p(E8390_RREAD+E8390_START, ioaddr); /* Trigger it... */
483                 mdelay(10);             /* wait 10ms for interrupt to propagate */
484                 outb_p(0x00, ioaddr + EN0_IMR);                 /* Mask it again. */
485                 dev->irq = probe_irq_off(cookie);
486                 if (netif_msg_probe(ei_local))
487                         pr_cont(" autoirq is %d", dev->irq);
488         } else if (dev->irq == 2)
489                 /* Fixup for users that don't know that IRQ 2 is really IRQ 9,
490                    or don't know which one to set. */
491                 dev->irq = 9;
492 
493         if (! dev->irq) {
494                 pr_cont(" failed to detect IRQ line.\n");
495                 ret = -EAGAIN;
496                 goto err_out;
497         }
498 
499         /* Snarf the interrupt now.  There's no point in waiting since we cannot
500            share and the board will usually be enabled. */
501         ret = request_irq(dev->irq, eip_interrupt, 0, name, dev);
502         if (ret) {
503                 pr_cont(" unable to get IRQ %d (errno=%d).\n", dev->irq, ret);
504                 goto err_out;
505         }
506 
507         dev->base_addr = ioaddr;
508 
509 #ifdef CONFIG_PLAT_MAPPI
510         outb_p(E8390_NODMA + E8390_PAGE1 + E8390_STOP,
511                 ioaddr + E8390_CMD); /* 0x61 */
512         for (i = 0; i < ETH_ALEN; i++) {
513                 dev->dev_addr[i] = SA_prom[i]
514                         = inb_p(ioaddr + EN1_PHYS_SHIFT(i));
515         }
516 #else
517         for (i = 0; i < ETH_ALEN; i++) {
518                 dev->dev_addr[i] = SA_prom[i];
519         }
520 #endif
521 
522         pr_cont("%pM\n", dev->dev_addr);
523 
524         ei_status.name = name;
525         ei_status.tx_start_page = start_page;
526         ei_status.stop_page = stop_page;
527 
528         /* Use 16-bit mode only if this wasn't overridden by DCR_VAL */
529         ei_status.word16 = (wordlength == 2 && (DCR_VAL & 0x01));
530 
531         ei_status.rx_start_page = start_page + TX_PAGES;
532 #ifdef PACKETBUF_MEMSIZE
533          /* Allow the packet buffer size to be overridden by know-it-alls. */
534         ei_status.stop_page = ei_status.tx_start_page + PACKETBUF_MEMSIZE;
535 #endif
536 
537         ei_status.reset_8390 = &ne_reset_8390;
538         ei_status.block_input = &ne_block_input;
539         ei_status.block_output = &ne_block_output;
540         ei_status.get_8390_hdr = &ne_get_8390_hdr;
541         ei_status.priv = 0;
542 
543         dev->netdev_ops = &eip_netdev_ops;
544         NS8390p_init(dev, 0);
545 
546         ei_local->msg_enable = ne_msg_enable;
547         ret = register_netdev(dev);
548         if (ret)
549                 goto out_irq;
550         netdev_info(dev, "%s found at %#lx, using IRQ %d.\n",
551                     name, ioaddr, dev->irq);
552         return 0;
553 
554 out_irq:
555         free_irq(dev->irq, dev);
556 err_out:
557         release_region(ioaddr, NE_IO_EXTENT);
558         return ret;
559 }
560 
561 /* Hard reset the card.  This used to pause for the same period that a
562    8390 reset command required, but that shouldn't be necessary. */
563 
564 static void ne_reset_8390(struct net_device *dev)
565 {
566         unsigned long reset_start_time = jiffies;
567         struct ei_device *ei_local = netdev_priv(dev);
568 
569         netif_dbg(ei_local, hw, dev, "resetting the 8390 t=%ld...\n", jiffies);
570 
571         /* DON'T change these to inb_p/outb_p or reset will fail on clones. */
572         outb(inb(NE_BASE + NE_RESET), NE_BASE + NE_RESET);
573 
574         ei_status.txing = 0;
575         ei_status.dmaing = 0;
576 
577         /* This check _should_not_ be necessary, omit eventually. */
578         while ((inb_p(NE_BASE+EN0_ISR) & ENISR_RESET) == 0)
579                 if (time_after(jiffies, reset_start_time + 2*HZ/100)) {
580                         netdev_err(dev, "ne_reset_8390() did not complete.\n");
581                         break;
582                 }
583         outb_p(ENISR_RESET, NE_BASE + EN0_ISR); /* Ack intr. */
584 }
585 
586 /* Grab the 8390 specific header. Similar to the block_input routine, but
587    we don't need to be concerned with ring wrap as the header will be at
588    the start of a page, so we optimize accordingly. */
589 
590 static void ne_get_8390_hdr(struct net_device *dev, struct e8390_pkt_hdr *hdr, int ring_page)
591 {
592         int nic_base = dev->base_addr;
593 
594         /* This *shouldn't* happen. If it does, it's the last thing you'll see */
595 
596         if (ei_status.dmaing)
597         {
598                 netdev_err(dev, "DMAing conflict in ne_get_8390_hdr "
599                            "[DMAstat:%d][irqlock:%d].\n",
600                            ei_status.dmaing, ei_status.irqlock);
601                 return;
602         }
603 
604         ei_status.dmaing |= 0x01;
605         outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
606         outb_p(sizeof(struct e8390_pkt_hdr), nic_base + EN0_RCNTLO);
607         outb_p(0, nic_base + EN0_RCNTHI);
608         outb_p(0, nic_base + EN0_RSARLO);               /* On page boundary */
609         outb_p(ring_page, nic_base + EN0_RSARHI);
610         outb_p(E8390_RREAD+E8390_START, nic_base + NE_CMD);
611 
612         if (ei_status.word16)
613                 insw(NE_BASE + NE_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr)>>1);
614         else
615                 insb(NE_BASE + NE_DATAPORT, hdr, sizeof(struct e8390_pkt_hdr));
616 
617         outb_p(ENISR_RDC, nic_base + EN0_ISR);  /* Ack intr. */
618         ei_status.dmaing &= ~0x01;
619 
620         le16_to_cpus(&hdr->count);
621 }
622 
623 /* Block input and output, similar to the Crynwr packet driver.  If you
624    are porting to a new ethercard, look at the packet driver source for hints.
625    The NEx000 doesn't share the on-board packet memory -- you have to put
626    the packet out through the "remote DMA" dataport using outb. */
627 
628 static void ne_block_input(struct net_device *dev, int count, struct sk_buff *skb, int ring_offset)
629 {
630 #ifdef NE_SANITY_CHECK
631         int xfer_count = count;
632         struct ei_device *ei_local = netdev_priv(dev);
633 #endif
634         int nic_base = dev->base_addr;
635         char *buf = skb->data;
636 
637         /* This *shouldn't* happen. If it does, it's the last thing you'll see */
638         if (ei_status.dmaing)
639         {
640                 netdev_err(dev, "DMAing conflict in ne_block_input "
641                            "[DMAstat:%d][irqlock:%d].\n",
642                            ei_status.dmaing, ei_status.irqlock);
643                 return;
644         }
645         ei_status.dmaing |= 0x01;
646         outb_p(E8390_NODMA+E8390_PAGE0+E8390_START, nic_base+ NE_CMD);
647         outb_p(count & 0xff, nic_base + EN0_RCNTLO);
648         outb_p(count >> 8, nic_base + EN0_RCNTHI);
649         outb_p(ring_offset & 0xff, nic_base + EN0_RSARLO);
650         outb_p(ring_offset >> 8, nic_base + EN0_RSARHI);
651         outb_p(E8390_RREAD+E8390_START, nic_base + NE_CMD);
652         if (ei_status.word16)
653         {
654                 insw(NE_BASE + NE_DATAPORT,buf,count>>1);
655                 if (count & 0x01)
656                 {
657                         buf[count-1] = inb(NE_BASE + NE_DATAPORT);
658 #ifdef NE_SANITY_CHECK
659                         xfer_count++;
660 #endif
661                 }
662         } else {
663                 insb(NE_BASE + NE_DATAPORT, buf, count);
664         }
665 
666 #ifdef NE_SANITY_CHECK
667         /* This was for the ALPHA version only, but enough people have
668            been encountering problems so it is still here.  If you see
669            this message you either 1) have a slightly incompatible clone
670            or 2) have noise/speed problems with your bus. */
671 
672         if (netif_msg_rx_status(ei_local))
673         {
674                 /* DMA termination address check... */
675                 int addr, tries = 20;
676                 do {
677                         /* DON'T check for 'inb_p(EN0_ISR) & ENISR_RDC' here
678                            -- it's broken for Rx on some cards! */
679                         int high = inb_p(nic_base + EN0_RSARHI);
680                         int low = inb_p(nic_base + EN0_RSARLO);
681                         addr = (high << 8) + low;
682                         if (((ring_offset + xfer_count) & 0xff) == low)
683                                 break;
684                 } while (--tries > 0);
685                 if (tries <= 0)
686                         netdev_warn(dev, "RX transfer address mismatch,"
687                                     "%#4.4x (expected) vs. %#4.4x (actual).\n",
688                                     ring_offset + xfer_count, addr);
689         }
690 #endif
691         outb_p(ENISR_RDC, nic_base + EN0_ISR);  /* Ack intr. */
692         ei_status.dmaing &= ~0x01;
693 }
694 
695 static void ne_block_output(struct net_device *dev, int count,
696                 const unsigned char *buf, const int start_page)
697 {
698         int nic_base = NE_BASE;
699         unsigned long dma_start;
700 #ifdef NE_SANITY_CHECK
701         int retries = 0;
702         struct ei_device *ei_local = netdev_priv(dev);
703 #endif
704 
705         /* Round the count up for word writes.  Do we need to do this?
706            What effect will an odd byte count have on the 8390?
707            I should check someday. */
708 
709         if (ei_status.word16 && (count & 0x01))
710                 count++;
711 
712         /* This *shouldn't* happen. If it does, it's the last thing you'll see */
713         if (ei_status.dmaing)
714         {
715                 netdev_err(dev, "DMAing conflict in ne_block_output."
716                            "[DMAstat:%d][irqlock:%d]\n",
717                            ei_status.dmaing, ei_status.irqlock);
718                 return;
719         }
720         ei_status.dmaing |= 0x01;
721         /* We should already be in page 0, but to be safe... */
722         outb_p(E8390_PAGE0+E8390_START+E8390_NODMA, nic_base + NE_CMD);
723 
724 #ifdef NE_SANITY_CHECK
725 retry:
726 #endif
727 
728 #ifdef NE8390_RW_BUGFIX
729         /* Handle the read-before-write bug the same way as the
730            Crynwr packet driver -- the NatSemi method doesn't work.
731            Actually this doesn't always work either, but if you have
732            problems with your NEx000 this is better than nothing! */
733 
734         outb_p(0x42, nic_base + EN0_RCNTLO);
735         outb_p(0x00,   nic_base + EN0_RCNTHI);
736         outb_p(0x42, nic_base + EN0_RSARLO);
737         outb_p(0x00, nic_base + EN0_RSARHI);
738         outb_p(E8390_RREAD+E8390_START, nic_base + NE_CMD);
739         /* Make certain that the dummy read has occurred. */
740         udelay(6);
741 #endif
742 
743         outb_p(ENISR_RDC, nic_base + EN0_ISR);
744 
745         /* Now the normal output. */
746         outb_p(count & 0xff, nic_base + EN0_RCNTLO);
747         outb_p(count >> 8,   nic_base + EN0_RCNTHI);
748         outb_p(0x00, nic_base + EN0_RSARLO);
749         outb_p(start_page, nic_base + EN0_RSARHI);
750 
751         outb_p(E8390_RWRITE+E8390_START, nic_base + NE_CMD);
752         if (ei_status.word16) {
753                 outsw(NE_BASE + NE_DATAPORT, buf, count>>1);
754         } else {
755                 outsb(NE_BASE + NE_DATAPORT, buf, count);
756         }
757 
758         dma_start = jiffies;
759 
760 #ifdef NE_SANITY_CHECK
761         /* This was for the ALPHA version only, but enough people have
762            been encountering problems so it is still here. */
763 
764         if (netif_msg_tx_queued(ei_local))
765         {
766                 /* DMA termination address check... */
767                 int addr, tries = 20;
768                 do {
769                         int high = inb_p(nic_base + EN0_RSARHI);
770                         int low = inb_p(nic_base + EN0_RSARLO);
771                         addr = (high << 8) + low;
772                         if ((start_page << 8) + count == addr)
773                                 break;
774                 } while (--tries > 0);
775 
776                 if (tries <= 0)
777                 {
778                         netdev_warn(dev, "Tx packet transfer address mismatch,"
779                                     "%#4.4x (expected) vs. %#4.4x (actual).\n",
780                                     (start_page << 8) + count, addr);
781                         if (retries++ == 0)
782                                 goto retry;
783                 }
784         }
785 #endif
786 
787         while ((inb_p(nic_base + EN0_ISR) & ENISR_RDC) == 0)
788                 if (time_after(jiffies, dma_start + 2*HZ/100)) {                /* 20ms */
789                         netdev_warn(dev, "timeout waiting for Tx RDC.\n");
790                         ne_reset_8390(dev);
791                         NS8390p_init(dev, 1);
792                         break;
793                 }
794 
795         outb_p(ENISR_RDC, nic_base + EN0_ISR);  /* Ack intr. */
796         ei_status.dmaing &= ~0x01;
797 }
798 
799 static int __init ne_drv_probe(struct platform_device *pdev)
800 {
801         struct net_device *dev;
802         int err, this_dev = pdev->id;
803         struct resource *res;
804 
805         dev = alloc_eip_netdev();
806         if (!dev)
807                 return -ENOMEM;
808 
809         /* ne.c doesn't populate resources in platform_device, but
810          * rbtx4927_ne_init and rbtx4938_ne_init do register devices
811          * with resources.
812          */
813         res = platform_get_resource(pdev, IORESOURCE_IO, 0);
814         if (res) {
815                 dev->base_addr = res->start;
816                 dev->irq = platform_get_irq(pdev, 0);
817         } else {
818                 if (this_dev < 0 || this_dev >= MAX_NE_CARDS) {
819                         free_netdev(dev);
820                         return -EINVAL;
821                 }
822                 dev->base_addr = io[this_dev];
823                 dev->irq = irq[this_dev];
824                 dev->mem_end = bad[this_dev];
825         }
826         SET_NETDEV_DEV(dev, &pdev->dev);
827         err = do_ne_probe(dev);
828         if (err) {
829                 free_netdev(dev);
830                 return err;
831         }
832         platform_set_drvdata(pdev, dev);
833 
834         /* Update with any values found by probing, don't update if
835          * resources were specified.
836          */
837         if (!res) {
838                 io[this_dev] = dev->base_addr;
839                 irq[this_dev] = dev->irq;
840         }
841         return 0;
842 }
843 
844 static int ne_drv_remove(struct platform_device *pdev)
845 {
846         struct net_device *dev = platform_get_drvdata(pdev);
847 
848         if (dev) {
849                 struct pnp_dev *idev = (struct pnp_dev *)ei_status.priv;
850                 netif_device_detach(dev);
851                 unregister_netdev(dev);
852                 if (idev)
853                         pnp_device_detach(idev);
854                 /* Careful ne_drv_remove can be called twice, once from
855                  * the platform_driver.remove and again when the
856                  * platform_device is being removed.
857                  */
858                 ei_status.priv = 0;
859                 free_irq(dev->irq, dev);
860                 release_region(dev->base_addr, NE_IO_EXTENT);
861                 free_netdev(dev);
862         }
863         return 0;
864 }
865 
866 /* Remove unused devices or all if true. */
867 static void ne_loop_rm_unreg(int all)
868 {
869         int this_dev;
870         struct platform_device *pdev;
871         for (this_dev = 0; this_dev < MAX_NE_CARDS; this_dev++) {
872                 pdev = pdev_ne[this_dev];
873                 /* No network device == unused */
874                 if (pdev && (!platform_get_drvdata(pdev) || all)) {
875                         ne_drv_remove(pdev);
876                         platform_device_unregister(pdev);
877                         pdev_ne[this_dev] = NULL;
878                 }
879         }
880 }
881 
882 #ifdef CONFIG_PM
883 static int ne_drv_suspend(struct platform_device *pdev, pm_message_t state)
884 {
885         struct net_device *dev = platform_get_drvdata(pdev);
886 
887         if (netif_running(dev)) {
888                 struct pnp_dev *idev = (struct pnp_dev *)ei_status.priv;
889                 netif_device_detach(dev);
890                 if (idev)
891                         pnp_stop_dev(idev);
892         }
893         return 0;
894 }
895 
896 static int ne_drv_resume(struct platform_device *pdev)
897 {
898         struct net_device *dev = platform_get_drvdata(pdev);
899 
900         if (netif_running(dev)) {
901                 struct pnp_dev *idev = (struct pnp_dev *)ei_status.priv;
902                 if (idev)
903                         pnp_start_dev(idev);
904                 ne_reset_8390(dev);
905                 NS8390p_init(dev, 1);
906                 netif_device_attach(dev);
907         }
908         return 0;
909 }
910 #else
911 #define ne_drv_suspend NULL
912 #define ne_drv_resume NULL
913 #endif
914 
915 static struct platform_driver ne_driver = {
916         .remove         = ne_drv_remove,
917         .suspend        = ne_drv_suspend,
918         .resume         = ne_drv_resume,
919         .driver         = {
920                 .name   = DRV_NAME,
921                 .owner  = THIS_MODULE,
922         },
923 };
924 
925 static void __init ne_add_devices(void)
926 {
927         int this_dev;
928         struct platform_device *pdev;
929 
930         for (this_dev = 0; this_dev < MAX_NE_CARDS; this_dev++) {
931                 if (pdev_ne[this_dev])
932                         continue;
933                 pdev = platform_device_register_simple(
934                         DRV_NAME, this_dev, NULL, 0);
935                 if (IS_ERR(pdev))
936                         continue;
937                 pdev_ne[this_dev] = pdev;
938         }
939 }
940 
941 #ifdef MODULE
942 int __init init_module(void)
943 {
944         int retval;
945         ne_add_devices();
946         retval = platform_driver_probe(&ne_driver, ne_drv_probe);
947         if (retval) {
948                 if (io[0] == 0)
949                         pr_notice("ne.c: You must supply \"io=0xNNN\""
950                                " value(s) for ISA cards.\n");
951                 ne_loop_rm_unreg(1);
952                 return retval;
953         }
954 
955         /* Unregister unused platform_devices. */
956         ne_loop_rm_unreg(0);
957         return retval;
958 }
959 #else /* MODULE */
960 static int __init ne_init(void)
961 {
962         int retval = platform_driver_probe(&ne_driver, ne_drv_probe);
963 
964         /* Unregister unused platform_devices. */
965         ne_loop_rm_unreg(0);
966         return retval;
967 }
968 module_init(ne_init);
969 
970 struct net_device * __init ne_probe(int unit)
971 {
972         int this_dev;
973         struct net_device *dev;
974 
975         /* Find an empty slot, that is no net_device and zero io port. */
976         this_dev = 0;
977         while ((pdev_ne[this_dev] && platform_get_drvdata(pdev_ne[this_dev])) ||
978                 io[this_dev]) {
979                 if (++this_dev == MAX_NE_CARDS)
980                         return ERR_PTR(-ENOMEM);
981         }
982 
983         /* Get irq, io from kernel command line */
984         dev = alloc_eip_netdev();
985         if (!dev)
986                 return ERR_PTR(-ENOMEM);
987 
988         sprintf(dev->name, "eth%d", unit);
989         netdev_boot_setup_check(dev);
990 
991         io[this_dev] = dev->base_addr;
992         irq[this_dev] = dev->irq;
993         bad[this_dev] = dev->mem_end;
994 
995         free_netdev(dev);
996 
997         ne_add_devices();
998 
999         /* return the first device found */
1000         for (this_dev = 0; this_dev < MAX_NE_CARDS; this_dev++) {
1001                 if (pdev_ne[this_dev]) {
1002                         dev = platform_get_drvdata(pdev_ne[this_dev]);
1003                         if (dev)
1004                                 return dev;
1005                 }
1006         }
1007 
1008         return ERR_PTR(-ENODEV);
1009 }
1010 #endif /* MODULE */
1011 
1012 static void __exit ne_exit(void)
1013 {
1014         platform_driver_unregister(&ne_driver);
1015         ne_loop_rm_unreg(1);
1016 }
1017 module_exit(ne_exit);
1018 

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